WO2023128702A1 - 뇌혈관장벽 투과성 융합 단백질 및 이의 용도 - Google Patents
뇌혈관장벽 투과성 융합 단백질 및 이의 용도 Download PDFInfo
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- C07K16/2803—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
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Definitions
- the present invention relates to a blood-brain barrier penetrating fusion protein and its use, to a fusion protein comprising an IgG antibody and a helical region binding moiety of a transferrin receptor linked to the terminus of the IgG antibody, and a pharmaceutical use thereof.
- This patent application is based on Korean Patent Application No. 10-2021-0194319 filed with the Korean Intellectual Property Office on December 31, 2021 and Korean Patent Application No. 10-2022-0189752 filed with the Korean Intellectual Property Office on December 29, 2022. priority is claimed, the disclosure of which is hereby incorporated by reference.
- the blood-brain barrier is a blood vessel barrier separating the brain and blood, and serves to isolate the central nervous system, including the brain, from potentially dangerous substances in the blood.
- the blood-brain barrier is a cerebrovascular-centered structure composed of cells such as brain endothelial cells, astrocytes, and pericytes, and is distributed throughout the cerebral blood vessels in brain tissue. there is. Blood-brain barrier endothelial cells are tightly coupled by tight junctions, and astrocytes and astrocyte end feet surround the blood vessels, so substances flowing along the blood inside the blood vessels penetrate the blood vessel barrier. to form a barrier that selectively inhibits uptake/delivery into brain tissue.
- This barrier-like structure selectively allows or inhibits the permeation of materials depending on the type and size of the material.
- water or oxygen which is essential for maintaining life, it can pass through the blood-brain barrier by diffusion, and energy Amino acids and glucose, which are used as sources, can be transported from blood to brain tissue by active transport.
- toxic substances and pathogens that can potentially affect the brain not only inhibit substance transfer by the blood-brain barrier, but even if permeated, are returned to the blood by the pumping action of cells and enter the brain tissue. It prevents the absorption of and protects the brain tissue.
- the blood-brain barrier having such a structure acts as a major obstacle in the pharmacological treatment of diseases associated with brain dysfunction, such as Alzheimer's disease, Parkinson's disease and brain cancer.
- diseases associated with brain dysfunction such as Alzheimer's disease, Parkinson's disease and brain cancer.
- the present inventors have designed an IgG antibody and a fusion protein in which a helical domain binding moiety of a tetravalent transferrin receptor is linked to the terminus of the IgG antibody, and the fusion protein is specific for the brain blood vessel region.
- the transferrin receptor cluster By the expression pattern of the transferrin receptor cluster and the specific interaction with the cluster in the brain blood vessel region, the permeability to the blood-brain barrier is improved, and the delivery efficiency to brain tissue is improved, as well as to brain tissue compared to other tissues. It was confirmed that the IgG antibody was selectively distributed at a high level, and based on this, the present invention was completed.
- one aspect is an IgG antibody; And a helical region binding moiety of a tetravalent transferrin receptor (TfR) linked to the C-terminal region of the light chain and the C-terminal region of the heavy chain of the IgG antibody, providing a blood-brain barrier penetrating fusion protein will be.
- TfR tetravalent transferrin receptor
- Another aspect is to provide a polynucleotide encoding the fusion protein, a vector containing the polynucleotide, and a transfected cell line transfected with the vector.
- Another aspect is to provide a pharmaceutical composition for preventing or treating diseases associated with brain dysfunction, comprising the fusion protein as an active ingredient.
- One aspect is an IgG antibody; And a helical region binding moiety of a tetravalent transferrin receptor (TfR) linked to the C-terminal region of the light chain and the C-terminal region of the heavy chain of the IgG antibody, providing a blood-brain barrier penetrating fusion protein.
- TfR tetravalent transferrin receptor
- BBB Blood-brain barrier
- blood-brain barrier refers to maintaining life, such as amino acids and glucose, while strictly controlling the movement of substances such as ions, molecules, and pathogens present in the blood to brain tissue. It refers to the structure of the cerebrovascular center that enables selective absorption of components essential for
- the blood-brain barrier consists of cells such as blood-brain barrier endothelial cells, astrocytes, and pericytes. The cells are arranged in a form sharing a common basement membrane, and endothelial cells tightly connected to the blood-brain barrier are distributed on one side of the blood-brain barrier, and astrocytes surrounding blood vessels are distributed on the other side.
- Blood-brain barrier endothelial cells constitute the walls of capillaries and are connected by very tight and complex tight junctions. This structure forms a physical barrier and serves to inhibit the simple diffusion of most substances, including molecules of average to large size, such as insulin.
- astrocytes are a type of glial cells in the central nervous system, and affect endothelial cell function, blood flow, and ion balance in the brain through interaction with cerebral blood vessels. Astrocytes use projections called end feet to wrap blood vessels at one end and make close contact with neurons at the other end at synapses.
- the blood-brain barrier with this structure protects brain tissue from potentially dangerous substances in the blood and at the same time prevents substances effective for the treatment of diseases from being delivered to brain tissue, acting as a major obstacle in pharmacological treatment. do. Therefore, the technique of improving the permeability of the blood-brain barrier can improve the applicability or efficacy of a therapeutic agent in the field of medicine targeting brain tissue.
- IgG antibody is an immunoglobulin molecule that is immunologically reactive with a specific antigen, and refers to a protein molecule that specifically recognizes an antigen and acts as an antigen receptor.
- the antibody has a heavy chain and a light chain, each heavy chain and light chain comprising a constant region and a variable region.
- the variable regions of the light and heavy chains contain three variable regions called complementarity-determining regions (CDRs) and four framework regions.
- CDR mainly serves to bind to an epitope of an antigen.
- the CDRs of each chain are typically called CDR1, CDR2, CDR3 sequentially starting from the N-terminus, and are also identified by the chain in which a particular CDR is located.
- the antibody may include all of polyclonal antibodies, monoclonal antibodies, full-length antibodies, and antibody fragments or antigen-binding fragments including an antigen-binding domain.
- a full-length antibody has a structure having two full-length light chains and two full-length heavy chains, and each light chain is connected to the heavy chain by a disulfide bond.
- the full-length antibody may preferably be IgG, and may include IgG1, IgG2, IgG3, and IgG4 as subtypes thereof.
- the antibody may be a native antibody or a recombinant antibody.
- a native antibody refers to an antibody that has not been genetically engineered, and the risk of immunogenicity that genetically engineered antibodies can have in vivo may be remarkably low.
- a recombinant antibody refers to a genetically engineered antibody, and has a feature that antigen-binding ability or desired characteristics can be added through genetic manipulation.
- antibody fragment refers to a fragment having an antigen-binding function, Fab, F(ab'), F(ab') 2 , Fv, single chain Fv (scFv ), and functional antibody fragments such as scFv-Fc bivalent molecules or combinations thereof, and the like.
- the antigen-binding fragment may exemplarily include, but is not limited to, structures of IgG-like bispecific antibodies known in the art may be employed without limitation: (1) Fab, antibody molecule fragments comprising monovalent antigen-binding fragments of, which can be produced by digesting the whole antibody with the enzyme papain to obtain parts of an unprocessed light chain and one heavy chain; (2) Fab', a fragment of an antibody molecule obtainable by treating the whole antibody with pepsin and then reducing it to obtain parts of the unprocessed light and heavy chains; Two Fab' fragments obtained per antibody molecule; (3) (Fab') 2 , a fragment of an antibody that can be obtained by treating a whole antibody with the enzyme pepsin without subsequent reduction, and a dimer of two Fab' fragments joined together by two disulfide bonds; (4) Fv, a genetically engineered fragment comprising the variable region of the light chain and the variable region of the heavy chain expressed as two chains; (5) a single chain antibody (SCA or s),
- the antibody or antibody fragment is an immunoglobulin molecule having an antigen-binding function, and is a monoclonal antibody, a multispecific antibody, a human antibody, a humanized antibody, a mouse antibody, a chimeric antibody, scFV, a single chain antibody, a Fab fragment, F (ab') fragment, F(ab') 2 , disulfide-linked Fvs (sdFV), scFv fragments, scFv-Fc fragments, Fv fragments, diabodies, triabodies, tetrabodies and the like.
- Fab has a structure having variable regions of light and heavy chains, constant regions of light chains, and a first constant region (CH1) of heavy chains, and has one antigen-binding site.
- Fab' differs from Fab in that it has a hinge region containing one or more cysteine residues at the C-terminus of the heavy chain CH1 domain.
- An F(ab') 2 antibody is produced by forming a disulfide bond between cysteine residues in the hinge region of Fab'.
- Fv is a minimal antibody fragment having only a heavy chain variable region and a light chain variable region.
- Double-chain Fv two-chain Fv is a heavy chain variable region and a light chain variable region are connected by a non-covalent bond.
- Such antibody fragments can be obtained using proteolytic enzymes (for example, restriction digestion of whole antibodies with papain yields Fab and digestion with pepsin yields F(ab') 2 fragments), and gene It can also be produced through recombinant technology.
- the IgG antibody is a subject forming a fusion with the helical region binding moiety of the transferrin receptor, and each of the light chain C-terminus and the heavy chain C-terminus constituting the IgG antibody is connected to the helical region binding moiety of the transferrin receptor or may be connected.
- These IgG antibodies have enhanced blood-brain barrier selective permeability and can be distributed at a relatively high level in brain tissue compared to other organs and cells.
- the IgG antibody may be an antibody or antigen-binding fragment capable of binding to a target antigen known in the art, applicable for treating, alleviating, or detecting a disease associated with brain dysfunction, for example, It may be a pharmaceutically active substance for treating or alleviating a disease associated with brain dysfunction.
- the IgG antibody is used for Alzheimer's disease; dementia with Lewy bodies; frontotemporal dementia; neuronal fiber knot-predominant dementia (tangle only dementia); Parkinson's disease; multiple sclerosis; amyotrophic Lateral sclerosis (ALS); traumatic brain injury; progressive supranuclear palsy; corticobasal degeneration; globular glial tauopathy; aging-related tau astrogliopathy; chronic traumatic encephalopathy (CTE); brain cancer such as primary CNS lymphoma (PCNSL), glioma, neuroblastoma, brain metastasis, meningioma, and the like; Pick's disease; anti-IgLON5-related taupathy; Guadeloupean parkinsonism; nodding syndrome; pain; epilepsy; autism; stroke; Guillain-Barre Syndrome (GBS); Creutzfeldt-Jakob disease (CJD); Huntington's disease; progressive multifocal leukoencephalopathy (PML);
- Transferrin receptor TfR
- transferrin receptor refers to a membrane glycoprotein expressed on the cell surface that mediates the intracellular uptake of iron from transferrin, a plasma glycoprotein, and is found in normal cells of various tissues. It has been reported that it is not only widely distributed, but also expressed in large amounts in activated immune cells and tumor cells. Therefore, transferrin receptor-mediated delivery technology requires not only effective delivery to brain tissue, but also low delivery to other organs or normal cells other than brain tissue. In fact, it has been reported that transferrin receptor-mediated delivery agents or therapeutics can cause erythrocyte-related toxicity, including decreased reticulocyte count, severe coma, intermittent limb stiffness, systemic stiffness, hemolysis, and hemoglobinuria.
- the ectodomain of the transferrin receptor is divided into an apical domain, a helical domain, and a protease-like domain, which are known to have different binding affinities to target substances in the process of receptor-mediated transcytosis.
- the genetic information of the transferrin receptor can be obtained from a known database such as GenBank of the National Center for Biotechnology Information (NCBI), and for example, the transferrin receptor may consist of the amino acid sequence of SEQ ID NO: 1. It is not limited.
- transferrin receptor cluster refers to a cluster in which a plurality of transferrin receptors are densely present in a local area, and the transferrin receptor cluster is distributed in tissues or cells such as blood vessels in a form in which a plurality of transferrin receptors are aggregated can do.
- transferrin receptor clusters present in brain blood vessels may have a specific expression pattern.
- the specific expression pattern refers to a state in which transferrin receptors are densely distributed at a significant level in local regions where clusters are formed, compared to other organ tissues or cells, and such brain tissue-specific clusters and transferrin in clusters
- the expression pattern of the receptor may show a close relationship with high permeability to the blood-brain barrier and selective delivery to brain tissue.
- the term "helical domain binding moiety of transferrin receptor” refers to a functional unit that interacts with a receptor present on the surface of a cell constituting the blood-brain barrier, and specifically, among the domains constituting the transferrin receptor, the helical It may mean a moiety having an effective binding affinity for the region.
- the helical domain binding moiety of the transferrin receptor reflects the expression pattern of the transferrin receptor cluster specific to blood vessels in brain tissue, and may be configured in a tetravalent form.
- the helical region of the transferrin receptor is a functional/structural region exposed to the outside so that an effective tetravalent bond is formed between a plurality of transferrin receptors and fusion proteins densely distributed in the cluster of blood vessels in brain tissue, which is effective against the blood-brain barrier. It can contribute to high permeability and selective delivery to brain tissue. Therefore, the binding moiety capable of binding to the helical region of the transferrin receptor is linked to an IgG antibody to significantly enhance the blood-brain barrier permeability of the IgG antibody, as well as selective delivery/absorption into brain tissue. It is possible to give functionality that enables.
- the binding moiety is for forming a complex/fusion by interacting with transferrin receptor clusters distributed in the blood vessel region of brain tissue, and may have binding affinity with a plurality of transferrin receptors in the local region where the cluster is formed, specifically .
- the helical region of the transferrin receptor more specifically, may have binding affinity with at least one amino acid selected from the region from the 606th amino acid to the 665th amino acid based on the transferrin receptor of SEQ ID NO: 1.
- the helical region binding moiety of the transferrin receptor may be linked to the C-terminal region of the light chain and the C-terminal region of the heavy chain of the IgG antibody, and thus the helical region binding moiety of the transferrin receptor may be 4 It can be linked to an IgG antibody in a valent form to exhibit the desired functionality.
- the helical domain-binding moiety of the transferrin receptor may have a length of 6 to 250 amino acids, for example, the length of the helical domain-binding moiety of the transferrin receptor is 6 to 240, or 6 to 220 amino acids.
- the length of the helical region binding moiety of the transferrin receptor is, for example, 10 to 48, 10 to 44, 10 to 40, 10 to 36, 10 to 32, 10 to 28, 10 to 24 10 to 20, 10 to 16, 10 to 12, 12 to 48, 12 to 44, 12 to 40, 12 to 36, 12 to 32, 12 to 28, 12 to 24 12 to 20, 12 to 16, 14 to 48, 14 to 44, 14 to 40, 14 to 36, 14 to 32, 14 to 28, 14 to 24, 14 to 20 dog, or 14 to 16 amino acids in length, but is not limited thereto.
- the helical region binding moiety of the transferrin receptor may include an amino acid sequence in which the unit sequence is repeated 2 to 5 times, 2 to 4 times, or 2 to 3 times.
- the monomer sequences may be linked by fusion or linked by a linker peptide.
- the linker peptide is 2 to 50 amino acids in length, e.g., 2 to 40, 2 to 30, 2 to 20, 2 to 15, 2 to 10, 2 to 5, 5 to 50; It may be 5 to 40, 5 to 30, 5 to 20, 5 to 15, or 5 to 10 amino acids in length, but is not limited thereto.
- linker peptide is, for example, (G l S m ) n (l is 2 to 8, m is 1 to 5, n is 1 to 5), (G d S e AS) f (d is 2 to 5) 8, e is 1 to 5, f is 1 to 5), (G 4 S) a (EAAAK) b (G 4 S) a (a, b are integers from 1 to 4), [(G 4 S) p (EAAAK) q ] r (p, q, r may be an integer from 1 to 4), but is not limited thereto.
- the unit sequence constituting the helical region binding moiety of the transferrin receptor may include a cell-penetrating peptide.
- the monomer sequence is exemplarily SEQ ID NO: 3 to SEQ ID NO: 43 It may be any one of, but if it is a unit sequence having an effective interaction (hydrogen bond, electrostatic attraction, van der Waals force) with the helical region of the transferrin receptor, that is, an effective binding affinity, it can be extended and applied without limitation.
- each of the helical domain binding moieties of the plurality of transferrin receptors may be the same or different.
- fusion protein refers to a protein formed through the binding of two or more originally separate proteins, or parts thereof, and may optionally include a linker or spacer located between two or more proteins.
- blood-brain barrier penetrating fusion protein is a protein formed through the binding between an IgG antibody and the helical domain-binding moiety of a transferrin receptor, which penetrates the blood-brain barrier and selectively delivers an effective amount of IgG antibody to brain tissue Alternatively, it may be a general term for proteins containing a functional structure that enables them to be absorbed.
- the functional structure is modified to have an effective binding affinity by reflecting the structure and expression patterns of the transferrin receptor cluster of vascular endothelial cells specifically distributed in the blood-brain barrier, binding that can bind to the helical region of the transferrin receptor It may include a moiety and a tetravalent bond (linkage) between the C-terminal regions of the heavy and light chains constituting the IgG antibody and the binding moiety.
- the blood-brain barrier-permeable fusion protein may include a functional structure in which a tetravalent helical region binding moiety is linked to the C-terminus of the light chain and the C-terminal region of the heavy chain of the IgG antibody. there is.
- connection between the C-terminus of the light chain of the IgG antibody and the C-terminal region of the heavy chain and the helical region binding moiety is fused to the above-mentioned terminal region of the IgG antibody, or by a linker peptide. It may be linked, and the details of the linker peptide are as described above.
- the blood-brain barrier penetrating fusion protein may form a complex by binding to a transferrin receptor that forms a transferrin receptor cluster specifically distributed in blood vessels of the blood-brain barrier.
- the blood-brain barrier penetrating fusion protein may bind to a plurality of transferrin receptors densely distributed in a transferrin receptor cluster compared to other organ tissues or cells.
- the functional structure is designed to reflect the effective binding affinity with the helical region of the transferrin receptor and the specific distribution / expression pattern of the transferrin receptor cluster distributed in the brain blood vessel region, and the C of the light chain in the IgG antibody
- a fusion protein was prepared in which a plurality of transferrin receptor helical domain binding moieties were linked to the -terminal and C-terminal regions of the heavy chain, that is, a total of four terminal regions.
- the fusion protein is a function derived from a tetravalent moiety having an effective binding affinity to the helical region of the transferrin receptor and a functional structure including the moiety, regardless of the type of IgG antibody and the specific sequence of the binding moiety, It was found that effects such as high permeability to the blood-brain barrier were exerted.
- a functional structure that can contribute to enhancing the blood-brain barrier permeability of an IgG antibody linked to the binding moiety, inducing selective delivery to brain tissue, and reducing side effects of antibody-based drugs at the same time newly identified.
- the blood-brain barrier penetrating fusion protein comprises a first binding moiety linked to the C-terminal region of the light chain of the IgG antibody; and a second binding moiety linked to the C-terminal region of the heavy chain of the IgG antibody, respectively.
- the blood-brain barrier penetrating fusion protein may be formulated and administered, and for the administration, a conventional fusion protein or antibody-based administration method may be applied without limitation, for example, intravenous administration , intramuscular administration, subcutaneous administration, intraperitoneal administration, intraocular administration, intrathecal administration, intracerebroventricular administration, intranasal administration, and the like.
- the fusion protein can provide an appropriate level of interaction or binding affinity with some region of the receptor present on the surface of the cell constituting the blood-brain barrier, that is, the helical region of the transferrin receptor
- the fusion partner IgG antibody can be delivered/distributed at a high level in brain tissue.
- Another aspect is a polynucleotide encoding the fusion protein; a vector containing the polynucleotide; Alternatively, a transfected cell line transfected with the vector is provided.
- the polynucleotide may be in the form of RNA or DNA, which includes cDNA and synthetic DNA.
- DNA can be single-stranded or double-stranded. If single-stranded, it may be the coding strand or the non-coding (antisense) strand, and the coding sequence may encode the same polypeptide as a result of degeneracy or redundancy of the genetic code. there is.
- the polynucleotide may also include a variant of a polynucleotide described herein, which variant of the polynucleotide may be a naturally occurring allelic variant of the polynucleotide or a non-naturally occurring variant of the polynucleotide.
- An allelic variant is an alternating form of a polynucleotide sequence that may have a substitution, deletion, or addition of one or more nucleotides that does not substantially alter the function of the polynucleotide being encoded (encoded). It is well known in the art that a single amino acid can be encoded by more than one nucleotide codon and that the polynucleotide can be readily modified to produce alternating polynucleotides encoding the same peptide.
- the term "vector” refers to a DNA vehicle capable of expressing a protein of interest in a suitable host cell, and refers to a genetic construct comprising regulatory elements operably linked to express a gene insert.
- a vector according to an embodiment may include expression control elements such as a promoter, an operator, an initiation codon, a stop codon, a polyadenylation signal, and/or an enhancer, and the promoter of the vector may be constitutive or inducible.
- the vector may be an expression vector capable of stably expressing the fusion protein in a host cell.
- the expression vector conventional ones used in the art to express foreign proteins in plants, animals, or microorganisms may be used.
- the recombinant vector may be constructed through various methods known in the art.
- the vector may include a selectable marker for selecting a host cell containing the vector and, if the vector is replicable, an origin of replication.
- the vector can replicate autonomously or be introduced into host DNA, wherein the vector is selected from the group consisting of plasmids, lentiviruses, adenoviruses, adeno-associated viruses, retroviruses, herpes simplex viruses, and vaccinia viruses. it could be
- the vector includes a promoter operable in an animal cell, preferably a mammalian cell.
- suitable promoters include promoters derived from mammalian viruses and promoters derived from the genome of mammalian cells, such as CMV (cytomegalovirus) promoter, T7 promoter, U6 promoter, H1 promoter, MLV (murine leukemia) promoter.
- Virus LTR long terminal repeat
- adenovirus early promoter adenovirus late promoter
- vaccinia virus 7.5K promoter SV40 promoter
- HSV tk promoter HSV tk promoter
- RSV promoter EF1 alpha promoter
- metallothionein promoter beta- Actin promoter
- promoter of human IL-2 gene promoter of human IFN gene
- promoter of human IL-4 gene promoter of human lymphotoxin gene
- promoter of human GM-CSF gene human phosphoglycerate kinase (PGK) promoter
- survivin promoter Chinese Hamster Elongation Factor-1 ⁇ (CHEF1- ⁇ ) promoter.
- CHEF1- ⁇ Chinese Hamster Elongation Factor-1 ⁇
- a polynucleotide sequence encoding the blood-brain barrier penetrating fusion protein may be operably linked to a promoter.
- operably linked refers to a functional linkage between a nucleic acid expression control sequence (e.g., a promoter, signal sequence, or array of transcriptional regulator binding sites) and another nucleic acid sequence, whereby the regulation The sequence will control the transcription and/or translation of said other nucleic acid sequence.
- transfection refers to the genetic character of a cell by infiltrating a piece of DNA chain or a plasmid having a foreign gene of a different kind from that of the original cell and combining with the DNA existing in the original cell. refers to molecular biological techniques that change The transfection means that a polynucleotide encoding the above-described blood-brain barrier-permeable fusion protein or a vector containing the polynucleotide is inserted into a host cell to produce the blood-brain barrier-permeable fusion protein.
- the transfected cell line or host cell is preferably a microorganism including prokaryotes such as bacteria and eukaryotes such as yeast, insect-derived cells such as Sf9 cells, mouse-derived cells such as CHO cells, human-derived cells such as HEK293, and It may be any one selected from the group consisting of antibody-producing hybridomas, but is not limited thereto.
- Another aspect is a pharmaceutical composition for preventing or treating diseases associated with brain dysfunction comprising the fusion protein as an active ingredient; medical use of the fusion protein for the prevention or treatment of diseases associated with brain dysfunction; Or it provides a method for treating a disease associated with brain dysfunction comprising administering the pharmaceutical composition to a subject.
- prevention refers to any activity that suppresses or delays the onset of diseases associated with brain dysfunction by administration of the pharmaceutical composition.
- treatment refers to all activities that improve or beneficially change symptoms of diseases associated with brain dysfunction by administration of the pharmaceutical composition.
- Diseases associated with brain dysfunction include Alzheimer's dementia; Lewy body dementia; frontotemporal dementia; neurofibrillary tangle-dominant dementia; Parkinson's disease; multiple sclerosis; amyotrophic lateral sclerosis; traumatic brain injury; progressive supranuclear palsy; corticobasal degeneration; glial tauopathy; age-related tau astrogliopathy; chronic traumatic encephalopathy; brain cancers such as primary central nervous system lymphomas, gliomas, neuroblastomas, brain metastases, meningioma, and the like; Pick's disease; anti-IgLON5 related tauopathies; Guadeloupe Parkinsonism; nading syndrome; ache; epilepsy; autism; stroke; Guillian-Barre Syndrome; Creutzfeldt-Jakob disease; Huntington's disease; progressive multifocal leukoencephalopathy; depression; post traumatic stress disorder; and lyso
- the pharmaceutical composition i.e., a pharmaceutical formulation comprising a fusion protein, comprises an antibody having a desired degree of purity in any pharmaceutically acceptable carrier, excipient or stabilizer (Remington's Pharmaceutical Sciences 16th edition, Osol, A. Ed. (1980)) and lyophilized formulation or aqueous solution.
- Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, and other organic acids; antioxidants such as ascorbic acid and methionine; Preservatives (such as octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride, benzethonium chloride; phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexa nol; 3-pentanol; and m-cresol); low molecular weight (less than about 10 residues) polypeptides; proteins such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; monosaccharides, disaccharides, and other carbohydrates such as glucose, mannose, or
- the pharmaceutical composition may contain additional active ingredients, optionally ingredients having complementary activities that do not adversely affect each other.
- the type and effective amount of the pharmaceutical composition are determined depending on, for example, the amount of antibody present in the formulation and the clinical parameters of the subject.
- the active ingredient is incorporated into microcapsules prepared, for example, by droplet formation techniques or interfacial polymerization, for example, hydroxymethylcellulose or gelatin-microcapsules and poly-(methylmethacrylate) microcapsules, respectively, for colloidal drug delivery. systems (eg, liposomes, albumin microspheres, microemulsions, nanoparticles and nanocapsules) or encapsulated form by macroemulsions.
- the pharmaceutical composition may be formulated, dosed, and administered in a manner consistent with medical practice. Factors to be considered in this regard include the particular disorder being treated, the particular mammal being treated, the clinical condition of the individual patient, the cause of the disorder, the site of delivery of the agent, the method of administration, the schedule of administration, and other factors known to the physician.
- the antibody need not be, but may be formulated with one or more agents currently used for the prevention or treatment of a disease.
- the effective amount of the other agent depends on the amount of antibody present in the formulation, the type of disorder or treatment, and other factors. They are generally administered at the same dosages and routes of administration as described herein, or from about 1 to 99% of the dosages described herein, or at any dosage and by any route determined empirically/clinically to be appropriate. used
- the method of treating a disease associated with brain dysfunction may use the pharmaceutical composition alone or in combination with other agents.
- the pharmaceutical composition may be co-administered with at least one additional therapeutic agent.
- additional therapeutic agents are effective therapeutic agents for the treatment of diseases associated with brain dysfunction, including but not limited to: cholinesterase inhibitors (such as donepezil, galantamine, lovastigmine and tacrine), NMDA Receptor antagonists (such as memantine), amyloid beta peptide aggregation inhibitors, antioxidants, ⁇ -secretase modulators, nerve growth factor (NGF) mimics or NGF gene therapy agents, PPAR ⁇ agonists, HMS-CoA reducing agents Enzyme inhibitors (statins), ampakines, calcium channel blockers, GABA receptor antagonists, glycogen synthase kinase inhibitors, intravenous immunoglobulins, muscarinic receptor agonists, nicotinic receptor modulators, active or passive amyloid beta peptides Immun
- an appropriate dosage of the pharmaceutical composition depends on the type of disease being treated, the severity and course of the disease, whether the antibody is Whether it is administered for prophylactic or therapeutic purposes will be determined according to the previously administered therapy, the patient's clinical history and response to the antibody, and the judgment of the attending physician.
- the antibody is suitably administered to the patient at one time or over a series of treatments, and for the purpose of the present invention, the antibody may be provided in the form of a fusion protein linked to a tetravalent helical domain binding moiety of the transferrin receptor.
- ⁇ g/kg to 100 mg/kg eg 0.1 mg/kg to 100 mg/kg
- a typical daily dosage may range from about 1 ⁇ g/kg to 100 mg/kg or more, depending on the factors mentioned above.
- treatment will generally be sustained until the required suppression of disease symptoms occurs.
- One exemplary dosage of the antibody or fusion protein would be in the range of about 0.05 mg/kg to about 100 mg/kg.
- one or more doses of about 0.5 mg/kg, 2.0 mg/kg, 4.0 mg/kg or 10 mg/kg, 20 mg/kg (or any combination thereof) may be administered to the patient.
- the dose may be administered intermittently, eg, every week or 3 weeks (eg, such that the patient is administered a dose of about 2 mg/kg to about 20 mg/kg, or, for example, about 6 mg/kg of the antibody or fusion protein). ) can be administered.
- An initial higher loading dose may be followed by one or more smaller doses.
- the term "individual” means a subject in need of treatment for a disease, and more specifically, mammals such as humans or non-human primates, mice, dogs, cats, horses, and cows. means
- the blood-brain barrier penetrating fusion protein when a formulation containing the fusion protein is administered intravenously, delivery of an IgG antibody in brain tissue is remarkably enhanced by an effective interaction between the binding moiety and the transferrin receptor. Confirmed.
- the blood-brain barrier penetrating fusion protein when a preparation containing the fusion protein is administered intravenously, by the distribution of specific transferrin receptor clusters in the vascular region of brain tissue and effective interaction with the clusters, Compared to other organs and cells, it was confirmed that the IgG antibody exhibited excellent biosafety as it could be selectively delivered at a high level in brain tissue.
- the fusion protein can be used as an active ingredient in a pharmaceutical composition that requires selective drug delivery to brain tissue, for example, for the prevention or treatment of diseases associated with brain dysfunction. .
- Figure 1 is an image of transferrin receptor through ultra-cold electron microscopy, and is a result of confirming a helical region in transferrin receptor.
- FIG. 4 is a result of confirming the intracellular delivery level of the helical region-binding moiety #01 according to one embodiment using a human brain endothelial cell line.
- FIG. 5 is a result of confirming the level of IgG1 antibody in brain tissue using a human IgG1 ELISA kit after intravenous administration of blood-brain barrier penetrating fusion protein F3#01 according to one embodiment to an animal model.
- FIG. 6 is a result of confirming the level of IgG1 antibody in ISF using a human IgG1 ELISA kit after intravenous administration of blood-brain barrier penetrating fusion protein F3#01 according to one embodiment to an animal model.
- FIG. 7 is a result of real-time imaging of the transcytosis of the fusion protein in the blood-brain barrier after intravenous administration of the blood-brain barrier penetrating fusion protein F3#01 according to one embodiment to an animal model having a cranial window.
- FIG. 8 shows intravascular (ROI 1), vessel wall (ROI 2) and extravascular (ROI 3) regions after intravenous administration of blood-brain barrier permeable fusion protein F3#01 according to an embodiment to an animal model having a cranial window. This is the result of real-time confirmation of the level of the fusion protein present in
- Figure 9 quantifies the level of IgG1 antibody in brain tissue as a relative value compared to the control group after intravenous administration of blood-brain barrier penetrating fusion proteins (F1#01, F3#01, F5#01) according to an embodiment to an animal model. This is the result of comparison.
- Figure 10 is a blood-brain barrier-permeable fusion protein (F1#01, F3#01, F5#01) according to an embodiment was intravenously administered to an animal model, and then the binding between the fusion protein and the transferrin receptor was confirmed through immunostaining.
- 10(a) is the result of the fusion protein F5#01
- (b) of FIG. 10 is the result of the fusion protein F1#01
- (c) of FIG. 10 is the result of the fusion protein F3#01.
- 11 is a comparison by quantifying the level of binding between the fusion protein and the transferrin receptor after intravenous administration of blood-brain barrier penetrating fusion proteins (F1#01, F3#01, F5#01) according to one embodiment to an animal model. This is the result.
- FIG. 13 is a result of imaging the structure of a complex formed by binding between a blood-brain barrier penetrating fusion protein and a transferrin receptor according to an embodiment.
- FIG. 14 is a result of confirming the distribution level of the IgG1 antibody by organ using a human IgG1 ELISA kit after intravenously administering the blood-brain barrier penetrating fusion protein F3#01 according to one embodiment to an animal model.
- 15 is a result of confirming the distribution level of the IgG1 antibody by organ using a human IgG1 ELISA kit after intravenously administering the blood-brain barrier penetrating fusion protein F3#01 according to an embodiment to an animal model.
- FIG. 16 is a result of confirming the percentage (%) of reticulocytes out of total red blood cells after intravenously administering blood-brain barrier-permeable fusion protein F3#01 to an animal model and obtaining blood.
- 17 is a result of confirming the concentration of the fusion protein in plasma after intravenously administering the blood-brain barrier penetrating fusion protein F3#01 to an animal model according to an embodiment.
- 19 is a result of confirming the level of IgG1 antibody in brain tissue using a human IgG1 ELISA kit after intravenous administration of blood-brain barrier penetrating fusion protein F3'#01 according to one embodiment to an animal model.
- 20 is a result of confirming the distribution level of the IgG1 antibody by organ using a human IgG1 ELISA kit after intravenously administering the blood-brain barrier penetrating fusion protein F3'#01 according to an embodiment to an animal model.
- 21 is a result of confirming the organ distribution level of IgG1 antibody using a human IgG1 ELISA kit after intravenously administering blood-brain barrier penetrating fusion protein F3'#01 according to an embodiment to an animal model.
- 24 is a result of comparing the quantitative distribution of transferrin receptor clusters formed in brain blood vessels, reticulocytes, lungs, livers, and spleens according to cluster sizes.
- 25 is a result of comparing average intensity values of all transferrin receptor clusters between cerebral blood vessels and reticulocytes.
- 26 is a diagram schematically showing the minimum value (min) and maximum value (max) of the distance between transferrin receptors as parameters for calculating the distance between transferrin receptors.
- 35 is a result of confirming the intracellular delivery level of the helical region-binding moiety #04 according to one embodiment using a human brain endothelial cell line.
- 36 is a result of confirming the level of intracellular delivery of helical region binding moiety #16, #19, or #20 using a human brain endothelial cell line according to one embodiment.
- 37 is a result of confirming the level of intracellular delivery of helical region-binding moiety #25, #26, or #27 using a human brain endothelial cell line according to one embodiment.
- 38 is a result of confirming the level of intracellular delivery of helical region-binding moiety #28, #29, or #31 using a human brain endothelial cell line according to one embodiment.
- 39 is a result of confirming the level of intracellular delivery of helical domain-binding moiety #34, #35, #36, or #37 according to one embodiment using a human brain endothelial cell line.
- FIG. 40 is a result of confirming the level of intracellular delivery of helical region-binding moiety #38, #40, or #41 using a human brain endothelial cell line according to one embodiment.
- Figure 41 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier penetrating fusion proteins F3#02, F3#03, F3#04, F3#05, or F3#06 to an animal model according to one embodiment. This is the result confirmed using the human IgG1 ELISA kit.
- Figure 42 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion proteins F3#07, F3#08, F3#09, F3#10, or F3#11 to an animal model according to one embodiment. This is the result confirmed using the human IgG1 ELISA kit.
- Figure 43 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F3#12, F3#13, F3#14, or F3#15 to an animal model according to one embodiment, by human IgG1 ELISA This is the result confirmed using the kit.
- Figure 44 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier penetrating fusion proteins F3#16, F3#17, F3#18, F3#19, or F3#20 to an animal model according to one embodiment. This is the result confirmed using the human IgG1 ELISA kit.
- Figure 45 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F3#21, F3#22, F3#23, or F3#24 to an animal model according to one embodiment, by human IgG1 ELISA This is the result confirmed using the kit.
- Figure 46 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F3#25, F3#26, or F3#27 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- Figure 47 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion proteins F3#28, F3#29, F3#30, F3#31, or F3#32 to an animal model according to one embodiment. This is the result confirmed using the human IgG1 ELISA kit.
- Figure 48 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion proteins F3#33, F3#34, F3#35, F3#36, or F3#37 to an animal model according to one embodiment. This is the result confirmed using the human IgG1 ELISA kit.
- Figure 49 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F3#38, F3#39, F3#40, or F3#41 to an animal model according to one embodiment, by human IgG1 ELISA This is the result confirmed using the kit.
- F1#03, F5#03, or F3#03 is a blood-brain barrier permeable fusion protein F1#03, F5#03, or F3#03 according to an embodiment was intravenously administered to an animal model, and the level of IgG1 antibody in brain tissue was measured using a human IgG1 ELISA kit. This is the result of checking
- Figure 51 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#05, F5#05, or F3#05 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- Figure 52 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#06, F5#06, or F3#06 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- Figure 53 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#12, F5#12, or F3#12 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- Figure 54 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#16, F5#16, or F3#16 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- FIG. 56 is a graph showing the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#27, F5#27, or F3#27 to an animal model according to an embodiment using a human IgG1 ELISA kit. This is the result of checking
- Figure 57 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#31, F5#31, or F3#31 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- FIG. 58 is a graph showing the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#37, F5#37, or F3#37 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- Figure 59 shows the level of IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier permeable fusion protein F1#40, F5#40, or F3#40 to an animal model according to one embodiment using a human IgG1 ELISA kit. This is the result of checking
- 60 is a result confirming the change in binding ability of an IgG1 antibody to PD-L1 according to the presence or absence of binding moiety #01 in blood-brain barrier-permeable fusion proteins F3#01 and F3'#01 according to an embodiment.
- Figure 61 shows the level of IgG1 antibody in ISF after intravenous administration of blood-brain barrier permeability fusion protein F3#25-Tau containing IgG1 antibody specifically binding to Tau according to one embodiment to an animal model by human IgG1 ELISA It was confirmed using the kit, and the result was expressed as a multiple of the control group.
- Figure 62 is a blood-brain barrier-permeable fusion protein F3#27-Tau or F3#36-Tau containing an IgG1 antibody specifically binding to Tau according to one embodiment was intravenously administered to an animal model, followed by an IgG1 antibody in ISF. The level of was confirmed using a human IgG1 ELISA kit, and the results were expressed as multiples compared to the control group.
- Figure 63 shows the level of human IgG1 antibody in brain tissue after intravenous administration of blood-brain barrier-permeable fusion protein F3#25-PD1 containing an IgG1 antibody specifically binding to PD1 according to one embodiment to an animal model. It was confirmed using an ELISA kit, and the result was expressed as a multiple of the control group.
- Figure 64 shows the level of human IgG1 antibody in brain tissue after intravenous administration of F3#25-HER2, a blood-brain barrier penetrating fusion protein containing an IgG1 antibody specifically binding to HER2 according to one embodiment, to an animal model. It was confirmed using an ELISA kit, and the result was expressed as a multiple of the control group.
- FIG. 65 shows the level of human IgG1 antibody in brain tissue after intravenous administration of F3#25-A ⁇ , a blood-brain barrier-permeable fusion protein containing an IgG1 antibody specifically binding to A ⁇ according to one embodiment, to an animal model. It was confirmed using an ELISA kit, and the result was expressed as a multiple of the control group.
- a fusion protein with enhanced blood-brain barrier permeability was prepared.
- a fusion protein was prepared in which the helical region binding moiety of the transferrin receptor was linked to the C-terminal region of the light chain and the C-terminal region of the heavy chain in the IgG1 antibody, that is, a total of four terminal regions.
- a total of 24 binding moieties having binding characteristics to the helical region, but having different amino acid sequences were derived as the helical region binding moiety of the transferrin receptor (first binding moiety group).
- helical region binding moiety of the transferrin receptor a total of 17 binding moieties in which some of the amino acid sequences are substituted, inserted, or deleted while maintaining sequence identity with the binding moiety of SEQ ID NO: 3 at a certain level or more Further derived (second binding moiety group).
- a blood-brain barrier-permeable fusion protein in which the helical region-binding moiety of the transferrin receptor was linked to the four terminal regions of the IgG1 antibody was prepared as follows. Specifically, a 1mL sample was taken with a pipette from the flask containing the cells, and the cell mass was measured. Then, if the cell viability is 95% or more and the cell mass is 4-6 ⁇ 10 6 cells/mL or more, the culture medium stored in the incubator at 37 °C is added and cultured so that the cell mass level is 9 ⁇ 10 6 cells/mL. prepared. Thereafter, transfection was performed on the prepared cells according to the following experimental conditions.
- the feed media and the enhancer were treated on the first day of culture, and the feed media was treated and cultured on the 5th day of culture.
- Transfected cells were obtained when the cell viability became 70% or less or when 8 days had elapsed from the day of transfection.
- the sample containing the transfected cells was centrifuged at 4500 rpm at 25° C. for 15 minutes, and the supernatant was recovered therefrom. Then, the supernatant was filtered using a 0.22 ⁇ m filter. Thereafter, purification of the filtrate was performed using a purification technique such as affinity chromatography and size exclusion chromatography to obtain each fusion protein.
- the purified antibody was analyzed by size exclusion high performance liquid chromatography (SEC-HPLC), sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), and mass spectrometry to confirm the purification result.
- the transferrin receptor helical region binding moiety and the IgG1 antibody are as follows.
- a fusion protein containing the second binding moiety group was prepared in the same manner as above. Meanwhile, in the fusion protein according to this embodiment, the transferrin receptor helical region binding moiety and the IgG1 antibody are as follows.
- Fusion proteins were prepared in which the helical domain binding moieties of two transferrin receptors were linked to either the C-terminal region of the heavy chain or the C-terminal region of the light chain in an IgG1 antibody (F1, F5).
- the helical domain binding moiety of the transferrin receptor includes a total of 6 representative binding moieties (#01, #03, #05, #06, #12, #16) among the first binding moiety group, A total of 5 representative binding moieties (#25, #27, #31, #37, #40) among the two binding moiety groups were used.
- binding moiety #01, #03, #05, #06, #12, or #16 as a helical region binding moiety of the transferrin receptor;
- fusion proteins having a structure in which two binding moieties are linked to the C-terminal region of the heavy chain in the IgG1 antibody were prepared in the same manner as in Example 1 (Comparative Examples 1 to 6: F1#01, F1#03 , F1#05, F1#06, F1#12, F1#16).
- binding moieties #01, #03, #05, #06, #12, or #16 as the helical region binding moiety of the transferrin receptor;
- Anti-PD-L1 IgG1 antibody as IgG1 antibody;
- fusion proteins having a structure in which two binding moieties are connected to the C-terminal region of the light chain in the IgG1 antibody were prepared in the same manner as in Example 7 (Comparative Examples 7 to 12: F5#01, F5#03, F5 #05, F5#06, F5#12, F5#16).
- binding moiety #25, #27, #31, #37, or #40 as a helical region binding moiety of the transferrin receptor;
- fusion proteins having a structure in which two binding moieties are connected to the C-terminal region of the heavy chain in the IgG1 antibody were prepared in the same manner as in Example 13 (Comparative Examples 13 to 17: F1#25, F1#27, F1 #31, F1#37, F1#40).
- binding moiety #25, #27, #31, #37, or #40 as the helical region binding moiety of the transferrin receptor, the anti-PD-L1 IgG1 antibody as the IgG1 antibody, and the C- of the light chain in the IgG1 antibody.
- Fusion proteins having a structure in which two binding moieties are connected to the terminal region were prepared in the same manner as in the above example (Comparative Examples 18 to 22: F5#25, F5#27, F5#31, F5#37, F5# 40).
- the functionality of the binding moiety #01 of the blood-brain barrier permeable fusion protein F3#01 was confirmed through binding to the helical region of the transferrin receptor and evaluation of the delivery level in human brain endothelial cells through this. wanted to
- the binding between the helical region binding moiety and the transferrin receptor (TfR) was confirmed by cryo-electron microscopy (Cryo-EM).
- Cryo-EM cryo-electron microscopy
- a 10 uM L7 TfR sample was prepared using a buffer solution of 50 mM Tris, 150 mM NaCl, and pH 7.6. Thereafter, vitrification was performed on the L7 TfR sample using a Quantifoil Cu 1.2/1.3 400mesh grid. At this time, in order to enhance the interaction between the sample and the grid, a negative charge discharge was induced on the surface of the grid using a glow discharger.
- the analysis was conducted under the conditions of 50 fractions per sample, 225 frames, pixel value 0.894 ⁇ /pix, dose rate 6.1 e/px/s, and total dose 49.93 e/ ⁇ 2, and the defocus range was - Analysis was performed within the range of 1.25 to -2.75, and after picking a total of 5 million or more particles, the initial 2D classification was performed using them. Afterwards, about 2 million final particles were selected and subjected to 3D refinement, and a 3D electron density map with a resolution of ⁇ 3.4 ⁇ was derived by applying C1 and C2 symmetry, respectively.
- the TfR and transferrin co-complex model (PDB:3s9n) was overlaid, and the binding position and key residues were predicted through comparison between the conventional binding method and the binding method of the helical region binding moiety.
- the binding between the helical domain binding moiety #01 and the transferrin receptor was confirmed through docking simulation. Specifically, docking simulation was performed to confirm whether binding moiety #01 has binding ability to the transferrin receptor helical region.
- the structure of the binding moiety #01 was modeled using the RosettaRelax program, and the expected interaction position with the transferrin receptor helical region was modeled through structural information and thermodynamic calculations. Then, a docking simulation was conducted using the RosettaDocking program to find the most stable position by randomly changing the position of the binding moiety and calculating the interaction with the helical region. 20,000 simulations were performed for each sequence number, and the resulting data were analyzed based on homology with the initial modeling structure and thermodynamic structural stability.
- hCMEC/D3 cells which are human brain endothelial cells constituting the human blood-brain barrier, by the above-described interaction of the helical region-binding moiety #01, which was confirmed to bind to the transferrin receptor in (1) of Experimental Example 1-1 I wanted to check whether it could be delivered to the inside.
- the hCMEC/D3 cells were cultured at 37° C. under 5% CO 2 conditions using a synthetic culture medium containing endothelial cell basal medium 2 (EBM2) containing growth factors.
- EBM2 endothelial cell basal medium 2
- the cells were separated, and 4 ⁇ 10 3 cells were added to 40 ⁇ L of the culture medium, which was dispensed into a 384-well plate, centrifuged for 10 seconds, and 37°C, 5% CO 2
- the cells were adhered to the plate by culturing for 18 hours or longer under the conditions.
- 500 ⁇ L of 1x PBS was added to 1 mg of the binding moiety peptide, mixed, and the concentration thereof was measured by ultraviolet-visible spectroscopy, and the peptide was diluted to a final concentration of 200 ⁇ M and stored at 4° C. Thereafter, the 200 ⁇ M peptide was diluted in the EBM2 culture medium at a concentration 5 times the treatment concentration.
- a formulation containing 20 mg/kg of the fusion protein F3#01 was intravenously administered to C57BL/6 mice through a tail vein, and a group to which only IgG1 antibody was intravenously administered was used as a control group. After 1 day, 4 days, 7 days, or 14 days had elapsed, the mouse was anesthetized and blood was collected from the blood vessel inside the eye or the abdominal vena cava. Thereafter, physiological saline was perfused to remove blood. Then, the brain of the mouse was removed, and the brain tissue was quickly frozen in liquid nitrogen and stored in a deep freezer until use. Meanwhile, after homogenizing the extracted brain tissue using a protein extraction solution, the homogenized brain tissue sample was dissolved at 4°C using a rotary mixer.
- a brain tissue lysate (Brain lysate). Then, the level of IgG1 antibody in the brain tissue lysate was measured using a human IgG1 ELISA kit. Specifically, a standard (STD) was prepared by diluting according to each concentration using a protein extraction solution, and a sample (SPL) containing brain tissue lysate was prepared according to each dilution ratio using a protein extraction solution, This was added by 50uL per well. Thereafter, 50uL of Ab cocktail included in the ELISA kit was additionally added to each well, and reacted at 4°C.
- the level of IgG1 antibody in the brain tissue of the F3#01-administered group was significantly higher than that of the control group until the 14th day after administration.
- a high level of delivery was shown from about 25 times to about 320 times compared to the control group.
- the amount of the fusion protein present in a form that is not bound to brain parenchyma is detected, and then recovery is performed for the detected value,
- the amount of the fusion protein that entered the brain parenchyma from blood vessels was evaluated. Specifically, after anesthetizing the C57BL/6 mouse, the skin of the head of the mouse was incised, and a hole was formed in the skull adjacent to the hippocampus region using a drill. Thereafter, a guide cannula was inserted into the formed cranial foramen and fixed using a resin.
- the mouse After the incised skin was sutured so that the perforated area of the skull was not exposed to the outside, the mouse was allowed to recover for 2 weeks. Thereafter, a formulation containing 20 mg/kg of the fusion protein (F3#01) was intravenously administered to the recovered mouse through the tail vein.
- F3#01 the fusion protein
- the mouse was anesthetized, and an activated probe for detecting IgG1 antibody was inserted into the probe guide cannula of the mouse. Thereafter, while flowing cerebrospinal fluid (CSF) containing BSA at a constant rate, interstitial fluid (ISF) samples containing the fusion protein were collected and stored at -20°C. Then, the level of IgG1 antibody in the ISF sample was measured using a human IgG1 ELISA kit. Specifically, after preparing standard (STD) and sample (SPL) diluted according to each concentration using N.S sample buffer, 50 uL of them were added to each well.
- CSF cerebrospinal fluid
- SPL sample
- GFP was measured in channel 1 and fluorescence intensities of Alexa-568 bound to the fusion protein were measured in channel 2.
- the measurement of the fluorescence intensity was performed for 20 minutes under conditions having a spatial resolution of 100 nm or less and a visual resolution of 1 minute or less in an area including at least 3 segments of blood vessels from the postcapillary venule.
- all the acquired time-series images were matched with the first time-series image and matched with the coordinates of the first time-series image.
- the region clustered near the vessel wall is called intravascular (ROI 1). ; region of interest), blood vessel wall (ROI 2), and extravascular (ROI 3) regions, and changes in the concentration of Alexa-568 bound to the fusion protein in the three ROIs were observed over time.
- the concentration change of the fusion protein in the extravascular (ROI 3) region was observed as the concentration of the fusion protein increased as the fusion protein cluster initially observed in the blood vessel wall (ROI 2) reached the extravascular region after about 6 minutes. It was observed that the concentration reached a maximum at about 12 minutes thereafter.
- the fusion proteins F3#01, F1#01, and F5#01 were intravenously administered through the tail vein, and 4 days later, IgG1 in brain tissue
- the antibody level was measured in the same manner as in Experimental Example 1-2 (1).
- a standard curve was obtained using 4 parameter logistic regression, and the concentration of the IgG1 antibody present in the sample (SPL) was calculated therefrom.
- the animal's brain was harvested one day after intravenous administration of the fusion protein in order to observe the delivery state of the antibody inside the cerebral blood vessel.
- the animal's thoracic cavity was opened, a butterfly needle was inserted into the left ventricle, physiological saline was injected, and internal blood was removed by expelling into the right atrium.
- the cells were fixed by injecting 4% paraformaldehyde (PFA), and the brain was extracted by incising the skull.
- PFA paraformaldehyde
- the extracted brain was stored in 4% PFA for one day for additional cell fixation, and then stored in a 30% sucrose solution for 3 days to prevent cell destruction during brain slice preparation.
- the brain of a mouse stored in a 30% sucrose solution for 3 days was put into a brain sectioning frame, an optimal cutting temperature compoud solution was injected, and the brain was cooled by storing it at -60°C.
- Brain slices with a thickness of 40 ⁇ m were made from the cooled brain samples using a micro-cryostat, and each brain slice was used for immunostaining. Thereafter, immunostaining was performed using a transferrin receptor antibody and an antibody against the fusion protein, and images were confirmed by confocal microscopy.
- the level of IgG1 antibody in the brain tissue was quantified as a relative value compared to the control group, and as a result, compared to the control group, the heavy chain C-terminal and It was confirmed that the level of IgG1 antibody in brain tissue increased about 80-fold in the tetravalent fusion protein-administered group, that is, the F3#01-administered group, in which binding moieties were linked to each of the four C-terminal regions of the light chain.
- the bivalent fusion protein administration group that is, the F1#01 and F5#01 administration groups, in which binding moieties were linked to the two regions of the heavy chain C-terminus or the light chain C-terminus, the same binding moiety was used, the IgG1 antibody The level of did not show a significant difference from the control group.
- the fusion protein that is, the tetravalent binding moiety and the transferrin receptor
- TEM negative staining transmission electron microscope
- the grid specimen prepared as above was observed using a 60kV Jeol Gatan TEM, and negative staining sample analysis was performed on a 60K - 200K magnification.
- each of the tetravalent binding moieties according to one embodiment interacts with the helical region of the transferrin receptor to form a complex.
- the experimental results in Experimental Examples 1-3 see FIG. 9
- the experimental results of this example show that the interaction within the complex can be a major factor in improving permeability to the blood-brain barrier. indicates that there is
- the distribution level of the IgG1 antibody by organ was evaluated by intravenous administration of the blood-brain barrier penetrating fusion protein F3#01 according to one embodiment. Specifically, a formulation containing 20 mg/kg of the fusion protein F3#01 was intravenously administered to C57BL/6 mice through a tail vein, and a group to which only IgG1 antibody was intravenously administered was used as a control group. Then, at the time of 1 day or 4 days from this, the level of IgG1 antibody in a total of 6 organs (brain, lung, spleen, kidney, liver, muscle) was compared with (1) of Experimental Example 1-2. Measurements were made in the same manner and compared.
- the level of distribution of the IgG1 antibody for each organ at the time of 1 day was as shown in FIG. 14, and the blood-brain barrier-permeable fusion protein F3
- the distribution level of the IgG1 antibody by organ at the time of 4 days from this was shown in FIG. 15 .
- the IgG1 antibody administered intravenously as a control showed the highest distribution in the lungs and relatively low distribution in the brain tissue among organs, whereas the F3#01 administration group showed a very high level in brain tissue compared to other organs. It was confirmed that the IgG1 antibody was distributed.
- the fusion protein comprising a functional structure according to one embodiment reduces the distribution of IgG antibody in tissues other than brain tissue due to its selective distribution to brain tissue when administered intravenously, thereby reducing the side effects of antibody-based drugs. It was found that it can contribute to alleviating
- the effect on reticulocytes was examined. Specifically, a preparation containing 20 mg/kg or 50 mg/kg of the fusion protein F3#01 was intravenously administered to C57BL/6 mice through the tail vein. On day 0, day 1, day 4, or day 7 after intravenous administration of the fusion protein to the mouse, a blood sample of 50 ⁇ l was obtained from the inner blood vessel of the mouse using a heparinized capillary tube.
- the mixed solution was allowed to stand at room temperature for a certain period of time. Thereafter, the stained blood sample was smeared on a slide glass and observed under a microscope to calculate the ratio (%) of reticulocytes out of total red blood cells. Meanwhile, as a control group, a group to which IgG1 antibody was intravenously administered was used.
- the ratio of reticulocytes out of total red blood cells was similar to that of the control group.
- a formulation containing 20 mg/kg of the fusion protein F3#01 was intravenously administered to mice through the tail vein.
- blood samples were obtained from the mice.
- the plasma sample was separated by centrifugation, pretreatment for liquid chromatography mass spectrometry (LC-MS) was performed, and then LC-MS analysis was performed on the sample.
- LC-MS liquid chromatography mass spectrometry
- the plasma PK profile of the group administered with the blood-brain barrier penetrating fusion protein F3#01 according to one embodiment was similar to that of the control group.
- the distribution of the fusion protein to organs is insignificant.
- blood-to-plasma ratio peak of blood supernatant area ratio / peak area ratio of plasma
- blood-brain barrier penetrating fusion protein F3#01 according to one embodiment was added to plasma and blood samples to a final concentration of 40 ⁇ g/mL, and then left at room temperature for 30 minutes. Thereafter, blood samples were centrifuged, and blood supernatants were separately obtained.
- the plasma and blood supernatant samples were mixed with a PBS solution containing a surfactant and magnetic beads, and after culturing the mixture, the culture was washed twice with PBS containing a surfactant. After adding RapiGest surfactant and dithiothreitol, incubation was performed at 60° C. for 50 minutes, and then left at room temperature for 10 minutes. Thereafter, 1) after adding iodoacetic acid, incubated for 30 minutes at room temperature in the dark, 2) after adding trypsin, and incubating for 24 hours at 60 ° C, 3) after adding HCl, at 37 ° C Incubation was performed sequentially for 30 minutes.
- the culture was centrifuged to obtain a supernatant, then trypsin was added, and blood-to-plasma ratio (peak area ratio of blood supernatant / peak area ratio of plasma) was measured using LC-MS Calculated. Meanwhile, as a control group, an IgG1 antibody-treated group was used.
- the blood-to-plasma ratio of the group administered with the blood-brain barrier penetrating fusion protein F3#01 according to an embodiment also showed a similar level to that of the control group. It was found that this was attributable to the fact that the bond between the reticulocytes containing the transferrin receptor and the fusion protein was not formed.
- the blood-brain barrier penetrating fusion protein according to one embodiment did not have a high level of transferrin receptor-mediated transmission in organs other than brain tissue, and from this, selective delivery to brain tissue was confirmed.
- the level of uptake of the IgG1 antibody into the brain tissue by intravenous administration of the blood-brain barrier penetrating fusion protein F3'#01 according to an example was evaluated in the same manner as Experimental Example 1-2 (1).
- the level of IgG1 antibody in the brain tissue of the F3'#01 administration group was higher than that of the control group until the 7th day after administration.
- a high level of transfer was shown from about 18 times to about 160 times compared to the control group.
- the organ distribution level of the IgG1 antibody by intravenous administration of the blood-brain barrier penetrating fusion protein F3'#01 according to one embodiment was evaluated in the same manner as in Experimental Examples 1-5.
- the distribution level of the IgG1 antibody for each organ at the time of 1 day was as shown in FIG. 20, and the blood-brain barrier-permeable fusion protein
- the distribution level of the IgG1 antibody by organ at the time of 4 days from this was shown in FIG. 21 . That is, it was confirmed that a very high level of IgG1 antibody was distributed in the brain tissue compared to other organs in the F3'#01 administration group.
- the absorption level in brain tissue is improved, and the brain tissue It was found that it can exert unique functionality such as selective delivery.
- a fusion protein comprising a functional structure in which a tetravalent binding moiety is linked to the light chain C-terminus and the heavy chain C-terminus of an antibody according to one embodiment, as confirmed in the above example, due to its high permeability to the blood-brain barrier, It was experimentally confirmed that delivery of the IgG1 antibody to brain tissue was markedly enhanced, and high biosafety was exhibited due to selective delivery to brain tissue compared to other organs. Under the premise that this efficacy is due to the interaction between the binding moiety according to one embodiment and the transferrin receptor present in brain tissue, in this experimental example, the expression pattern and characteristics of the transferrin receptor distributed in brain tissue were investigated.
- the selective delivery of the fusion protein to the brain tissue according to one embodiment is not only due to quantitative differences in transferrin receptor expression in each organ, but also to the transferrin receptor having a specific expression pattern in brain blood vessels. This indicates that the interaction between the binding moieties according to the embodiment or the functional structure capable of forming such an interaction can act as a major factor.
- the blood was removed by perfusion with physiological saline.
- the brain tissue was perfused with saline and 4% paraformaldehyde in order to prepare brain tissue samples for brain section staining using immunohistology.
- tissue freezing medium was added thereto to sufficiently submerge the brain tissue, and then stored in a deep freezer at -70 ° C for one day.
- Frozen brain blocks were sectioned by cryostat into 40 ⁇ m thick sections. The sections were stored in a PBS solution containing 0.1% sodium azide until use.
- the tissue sections were added to the 24-well plate and reacted with 500 ⁇ l of PBS solution containing 0.5% Triton-X 100 at room temperature for 20 minutes. Then, after replacing the solution with a PBS solution, it was mixed using a plate stirrer. Thereafter, the tissue sections were added to a PBS solution containing 5% BSA and 0.1% Triton-X 100, allowed to react at room temperature for 2 hours, and washed three times with the PBS solution. After adding the transferrin receptor antibody and the CD31 antibody thereto, the reaction was induced overnight at 4° C., and washed three times with a PBS solution.
- anti-Rat Alexa488 and anti-Goat Alexa568 were added thereto, reacted at room temperature for 2 hours, and then washed three times with a PBS solution. Subsequently, a PBS solution containing DAPI was added, and reacted at room temperature for 10 minutes. After the tissue section treated as described above was placed on a slide glass, 100 ⁇ l of mounting solution was applied. Thereafter, the tissue sections treated as described above were covered with cover glass and sealed.
- Fluorescence images for stained samples were obtained using confocal microscopy. Filming was performed with LAS-X software, and the light source intensity was adjusted to UV intensity 4% and white laser power 70% (488 - 15%, 568 - 10%). Magnification was performed using a 40X objective lens and setting the pixel resolution to 284 nm, and images were acquired for a total thickness of 20 ⁇ m with a thickness of 1 ⁇ m per tissue slice. In addition, super-resolution fluorescence images of the stained samples were obtained using a STED confocal microscope. Filming was done with LAS-X software, and the light source intensity was adjusted to UV intensity 6% and white laser power 70% (488 - 15%, 568 - 10%).
- magnification For magnification, a 100X objective lens was used, and software zoom and STED functions were used. In addition, the magnification was photographed by setting the pixel resolution to 50 nm, and an image of a total thickness of 3 ⁇ m was obtained with a thickness of 100 nm per tissue slice.
- the acquired images were analyzed using ImageJ and MATLAB software.
- gaussian blur was performed by setting the sigma value to 1.0, and each image was cut to the same size to create a representative image suitable for the color channel.
- background subtraction was performed through a rolling ball algorithm using a plugin of ImageJ software.
- the green signal which is the signal of the transferrin receptor, was normalized according to the intensity histogram, and a binary image was obtained using the local thresholding method.
- the analyze particle function was used to select only pixels with an area of at least 2500 nm 2 , which is the minimum pixel unit, to secure a distribution of cluster sizes.
- nm 2 which is the minimum pixel unit
- the distribution map a distribution map of transferrin receptors observed in a total of 40 cells per organ was taken as samples for 10 cells and tissues for each organ in a total of 4 C57BL/6 mice.
- the distribution map result obtained from ImageJ was converted into a histogram using MATLAB, and a trend line of the histogram was obtained using a smooth function.
- transferrin receptors expressed in brain tissue, liver, spleen, lung, and reticulocytes were distributed in the form of transferrin receptor clusters.
- FIG. 24 as a result of comparing the quantitative distribution of the sizes of transferrin receptor clusters expressed in brain tissue blood vessels, reticulocytes, lungs, livers, and spleens, the relative relative It was confirmed that small-sized transferrin receptor clusters were densely packed.
- the average intensity value of the entire transferrin receptor cluster between brain tissue blood vessels and reticulocytes was evaluated. Specifically, after imaging the transferrin receptor cluster in the same manner as (2) of Experimental Examples 1-8, the masked transferrin receptor cluster was extracted as a pixel with an area of 2500 nm 2 or more, which is the minimum pixel unit, using the analyze particle function. . Then, the extracted image was made into a mask image, and the intensity of the green signal was calculated in the cluster mask by multiplying the mask image obtained from ImageJ and the background subtracted image using MATLAB.
- 50,000 cells were collected from cerebral vascular tissues and reticulocytes of C57BL/6 mice by FACS, and total protein was extracted using RIPA buffer. The extracted protein was mixed with sample buffer, denaturated, loaded on SDS-PAGE gel, and then transferred to PVDF membrane. Thereafter, each protein band was identified on the membrane using an anti-TfR antibody as a primary antibody, and their intensities were measured using Image lab software (Biorad). The intensity of the transferrin receptor protein band measured in the two cells was quantified as the number of transferrin receptors per single cell using a standard curve of the recombinant transferrin receptor band.
- the total area of transferrin receptor clusters in a single cell was calculated using the average diameter and number of transferrin receptor clusters measured by the STED confocal microscope described above, and the quantified The number of transferrin receptors per cluster area in a single cell was calculated by dividing the number of receptors by the calculated total area. The calculated number of transferrin receptors was converted into molarity per area by dividing by Avogadro's number. At this time, since the transferrin receptor exists as a dimer, the calculated molar concentration was converted to half the value.
- the distance between the transferrin receptors present in the cluster was calculated as the distance from the central point in the transferrin receptor of the dimer to the central point of the neighboring receptor under the premise that the receptors were filled in a square lattice form. As shown in FIG. 26, the transferrin receptor The distance from the center to the surface is determined for the major and minor axes.
- the minimum value (min) is the distance between the surface of the receptor and the neighboring receptor centered on the long axis of the dimer, and the receptor neighboring the receptor centered on the short axis of the dimer After calculating the distance between the surfaces as the maximum value (max), it was evaluated as their average value (average).
- FIGS. 27 and 28 The results of evaluating the total transferrin receptor density and the distance between transferrin receptors between cerebral blood vessels and reticulocytes are shown in FIGS. 27 and 28 .
- the distribution of the density of transferrin receptors expressed in single cells of brain blood vessels was observed to be statistically significantly higher than that of reticulocytes.
- the distribution of surface-to-surface distances between transferrin receptors expressed in clusters of single cells as shown in FIG. observed briefly. That is, it was confirmed that the expression pattern of transferrin receptors was more concentrated inside the transferrin receptor clusters of cerebrovascular cells than in reticulocytes.
- the distribution pattern of the specific transferrin receptor cluster in the vascular region of brain tissue shows that the tetravalent binding moiety according to one embodiment is linked to the C-terminus of the light chain and the C-terminus of the heavy chain of the antibody. It indicates that it can affect the interaction with the fusion protein containing the structure.
- the specific expression pattern of the transferrin receptor cluster that induces specific interactions in these brain tissues acts as a factor enabling high permeability to the blood-brain barrier and selective uptake of IgG1 antibodies into brain tissues.
- the functionality of the binding moiety of the blood-brain barrier penetrating fusion protein according to one embodiment was confirmed through binding to the helical region of the transferrin receptor and evaluation of the level of delivery into human brain endothelial cells through the binding.
- the binding between 39 and the transferrin receptor (TfR) was confirmed through docking simulation.
- the structure of the binding moiety was modeled using the RosettaRelax program, and the position expected to interact with the transferrin receptor helical region was modeled through structural information and thermodynamic calculations. Then, a docking simulation was conducted using the RosettaDocking program to find the most stable position by randomly changing the position of the binding moiety and calculating the interaction with the helical region. 20,000 simulations were performed for each sequence number, and the resulting data were analyzed based on homology with the initial modeling structure and thermodynamic structural stability.
- the binding moiety according to one embodiment stably binds to the transferrin receptor helical region.
- hCMEC/D3 cells which are human brain endothelial cells constituting the human blood-brain barrier, by liver interaction was evaluated in the same manner as in (2) of Experimental Example 1-1. Meanwhile, as a control group, a group to which only IgG1 antibody was intravenously administered was used.
- the level of absorption into the brain tissue of the IgG1 antibody by intravenous administration was measured in the same manner as Experimental Example 1-2 (1), after intravenous administration. It was evaluated when 2 or 4 days had elapsed. Meanwhile, as a control group, a group to which only IgG1 antibody was intravenously administered was used.
- the fusion proteins F3#02 of Examples 2 to 24 prepared using first binding moiety groups having different amino acid sequences, but retaining binding properties to the helical region. It was confirmed that the levels of IgG1 antibody in brain tissue were significantly increased in all of the groups administered with F3#24 to F3#24 compared to the control group.
- a second binding moiety group in which a portion of the amino acid sequence is substituted, inserted, or deleted while maintaining a certain level or higher sequence identity with the binding moiety of SEQ ID NO: 3 is used. It was also confirmed that the levels of IgG1 antibodies in brain tissue were significantly increased in all groups administered with the fusion proteins F3#025 to F3#41 prepared in Examples 25 to 41 compared to the control group.
- the fusion protein according to one embodiment is a function derived from a moiety having an effective binding affinity to the helical region of the transferrin receptor, high permeability to the blood-brain barrier, and IgG1 antibody to brain tissue. It was found that the same effect as the high transmission of
- a fusion protein (F3) in which the helical region binding moiety of the transferrin receptor is tetravalently linked to the C-terminal region of the light chain and the C-terminal region of the heavy chain in an IgG1 antibody; 2) a fusion protein (F1) in which the helical region-binding moiety of the transferrin receptor is bivalently linked to the C-terminal region of the heavy chain in an IgG1 antibody; and 3) targeting a fusion protein (F5) in which the helical region binding moiety of the transferrin receptor is bivalently linked to the C-terminal region of the light chain in an IgG1 antibody, and the absorption of the IgG1 antibody into the brain tissue by intravenous administration of the fusion protein
- the level was evaluated in the same manner as in (1) of Experimental Example 1-2, at the time of 2 or 4 days after intravenous administration.
- the level of IgG1 antibody in the brain tissue was quantified and compared, and as a result, the fusion protein administration group in which the binding moiety was linked to each of the four regions of the heavy chain C-terminus and the light chain C-terminus.
- the fusion protein administration group with the binding moiety linked to the region (F1#03, F1#05, F1#06, F1#12, F1#16, F1#25, F1#27, F1#31, F1#37, or F1# 40), or a fusion protein administration group in which binding moieties were linked to the two C-terminal regions of the light chain (F5#03, F5#05, F5#06, F5#12, F5#16, F5#25, F5#27, F5 # 31, F5 # 37, or F5 # 40), it was confirmed that the level of IgG1 antibody in brain tissue was remarkably enhanced.
- the fusion protein is a structure reflecting the distribution pattern of the specific transferrin receptor cluster in the vascular region of the brain tissue described above, and has an effective binding affinity to the helical region of the transferrin receptor.
- the moiety was tetravalently linked to the terminal of the IgG1 antibody, it was confirmed again that the intrinsic functionality could be exhibited.
- the fusion proteins F3#01 and F3'#01 have the reactivity of the IgG1 antibody, that is, the binding ability to PD-L1, to a level similar to that of the control group. It was confirmed that From the above results, it is suggested that the blood-brain barrier penetration and selective delivery to the brain tissue by the fusion protein according to one embodiment are exhibited while maintaining the biological activity inherent in the IgG antibody.
- IgG1 antibody in which the helical region binding moiety of the transferrin receptor is tetravalently linked to the C-terminal region of the light chain and the C-terminal region of the heavy chain in an IgG1 antibody (F3), and the IgG1 antibody binds to Tau
- Blood-brain barrier-permeable fusion proteins were prepared in the same manner as in Example 1 by applying binding moieties #25, #27, or #36 to the helical domain binding moiety of the transferrin receptor (F3#25-Tau, F3# 27-Tau, F3#36-Tau).
- the type of IgG1 antibody which is the fusion partner of the helical domain binding moiety of the transferrin receptor, was changed to anti-Tau IgG1 antibody while maintaining the functional structure of the present application described above. Also, it was confirmed that the level of the anti-Tau IgG1 antibody in ISF was increased compared to the control group.
- the IgG1 antibody is an IgG1 antibody that binds to PD1 (anti-PD1)
- a blood-brain barrier penetrating fusion protein was prepared in the same manner as in Example 1 by applying binding moiety #25 to the helical region binding moiety of the transferrin receptor (F3#25-PD1). Thereafter, the level of uptake of the IgG1 antibody into brain tissue by intravenous administration of the prepared fusion protein was evaluated in the same manner as Experimental Example 1-2 (1). On the other hand, as a control, a group to which only IgG1 antibody was added was used.
- the IgG1 antibody binds to HER2 (anti-HER2)
- HER2 anti-HER2
- binding moiety #25 to the helical domain binding moiety of the transferrin receptor
- a blood-brain barrier penetrating fusion protein was prepared in the same manner as in Example 1 (F3#25-HER2).
- the level of uptake of the IgG1 antibody into brain tissue by intravenous administration of the prepared fusion protein was evaluated in the same manner as Experimental Example 1-2 (1).
- a control a group to which only IgG1 antibody was added was used.
- the IgG1 antibody is an IgG1 antibody that binds to A ⁇ (anti-A ⁇ )
- a blood-brain barrier-permeable fusion protein was prepared in the same manner as in Example 1 by applying binding moiety #25 to the helical domain binding moiety of the transferrin receptor (F3#25-A ⁇ ). Thereafter, the level of uptake of the IgG1 antibody into brain tissue by intravenous administration of the prepared fusion protein was evaluated in the same manner as Experimental Example 1-2 (1). On the other hand, as a control, a group to which only IgG1 antibody was added was used.
- the fusion protein according to one embodiment as a function derived from a moiety having an effective binding affinity to the helical region of the transferrin receptor and a functional structure including the moiety, is independent of the type of IgG1 antibody, and is effective in cerebral blood vessels. It was found that effects such as high permeability to the intestinal wall and high delivery of the IgG1 antibody to the brain tissue were exhibited.
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Abstract
Description
Claims (10)
- IgG 항체; 및상기 IgG 항체의 경쇄의 C-말단 영역 및 중쇄의 C-말단 영역에 연결된, 4가의 트랜스페린 수용체(transferrin receptor: TfR)의 helical 영역 결합 모이어티를 포함하는, 뇌혈관장벽 투과성 융합 단백질.
- 청구항 1에 있어서, 상기 뇌혈관장벽 투과성 융합 단백질은 뇌혈관장벽의 혈관에 특이적으로 분포된 트랜스페린 수용체 클러스터(transferrin receptor cluster)를 형성하는 트랜스페린 수용체와 결합하여 복합체를 형성하는 것인, 융합 단백질.
- 청구항 1에 있어서, 상기 뇌혈관장벽 투과성 융합 단백질은 뇌 조직에 선택적으로 전달되는 것인, 융합 단백질.
- 청구항 1에 있어서, 상기 결합 모이어티는 트랜스페린 수용체 내 서열번호 2의 helical 영역으로부터 선택되는 적어도 어느 하나 이상의 아미노산과 결합 친화력을 갖는 것인, 융합 단백질.
- 청구항 1에 있어서, 상기 복수 개의 결합 모이어티 각각은 동일하거나, 상이한 것인, 융합 단백질.
- 청구항 1에 있어서, 상기 IgG 항체는 IgG1, IgG2, IgG3, 또는 IgG4인 것인, 융합 단백질.
- 청구항 1에 있어서, 상기 결합 모이어티는 링커 펩타이드에 의해 상기 IgG 항체의 경쇄의 C-말단 영역 및 중쇄의 C-말단 영역에 연결된 것인, 융합 단백질.
- 청구항 1 내지 청구항 7 중 어느 한 항의 융합 단백질을 코딩하는 폴리뉴클레오티드.
- 청구항 8의 폴리뉴클레오티드를 포함하는 벡터.
- 청구항 9의 벡터로 형질주입된 형질주입 세포주.
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| CA3242212A CA3242212A1 (en) | 2021-12-31 | 2022-12-30 | Blood-brain barrier permeable fusion protein and uses thereof |
| US18/724,281 US20250066449A1 (en) | 2021-12-31 | 2022-12-30 | Blood-brain barrier permeable fusion protein and uses thereof |
| CN202280086214.8A CN118451099A (zh) | 2021-12-31 | 2022-12-30 | 血脑屏障通透性融合蛋白以及其用途 |
| EP22916843.0A EP4458848A4 (en) | 2021-12-31 | 2022-12-30 | BLOOD-BRAIN BARRIER PERMEABLE FUSION PROTEIN AND ITS USES |
| MX2024008346A MX2024008346A (es) | 2021-12-31 | 2022-12-30 | Proteina de fusion permeable a la barrera hematoencefalica y usos de la misma. |
| IL313919A IL313919A (en) | 2021-12-31 | 2022-12-30 | Blood-brain barrier permeable fusion protein and uses thereof |
| AU2022428997A AU2022428997A1 (en) | 2021-12-31 | 2022-12-30 | Blood-brain barrier permeable fusion protein and uses thereof |
| JP2024539008A JP7818860B2 (ja) | 2021-12-31 | 2022-12-30 | 脳血管障壁透過性融合タンパク質及びその用途 |
| CONC2024/0009279A CO2024009279A2 (es) | 2021-12-31 | 2024-07-12 | Título de la invención: proteína de fusión permeable a la barrera hematoencefálica y usos de la misma |
| ZA2024/05789A ZA202405789B (en) | 2021-12-31 | 2024-07-26 | Blood-brain barrier permeable fusion protein and uses thereof |
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| KR20240067001A (ko) * | 2022-10-28 | 2024-05-16 | 주식회사 아임뉴런 | 뇌혈관장벽 투과성 융합 단백질 및 이의 용도 |
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| KR20150039798A (ko) * | 2012-08-29 | 2015-04-13 | 에프. 호프만-라 로슈 아게 | 혈액 뇌 장벽 셔틀 |
| KR20160105799A (ko) * | 2014-01-06 | 2016-09-07 | 에프. 호프만-라 로슈 아게 | 1가 혈액 뇌 장벽 셔틀 모듈 |
| KR20210005647A (ko) | 2018-04-20 | 2021-01-14 | 더 제너럴 하스피탈 코포레이션 | 혈액뇌장벽을 통한 전달을 위한 아세틸화된 프로드러그 |
| KR20210074279A (ko) * | 2018-08-22 | 2021-06-21 | 데날리 테라퓨틱스 인크. | 항-her2 폴리펩타이드 및 이의 사용방법 |
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| EP3665194A4 (en) * | 2017-08-10 | 2021-07-07 | Denali Therapeutics Inc. | AFFINITY BASED METHODS OF USING TRANSFERRIN RECEPTOR BINDING PROTEINS |
| CA3124790A1 (en) * | 2019-01-09 | 2020-07-16 | Vect-Horus | Transferrin receptor-binding molecules, conjugates thereof and their uses |
| KR102274999B1 (ko) * | 2020-04-23 | 2021-07-08 | 주식회사 아임뉴런바이오사이언스 | 신규한 세포 투과성 펩타이드 및 이의 용도 |
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2022
- 2022-12-30 WO PCT/KR2022/021730 patent/WO2023128702A1/ko not_active Ceased
- 2022-12-30 AU AU2022428997A patent/AU2022428997A1/en active Pending
- 2022-12-30 IL IL313919A patent/IL313919A/en unknown
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- 2022-12-30 CA CA3242212A patent/CA3242212A1/en active Pending
- 2022-12-30 JP JP2024539008A patent/JP7818860B2/ja active Active
- 2022-12-30 US US18/724,281 patent/US20250066449A1/en active Pending
- 2022-12-30 EP EP22916843.0A patent/EP4458848A4/en active Pending
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2023
- 2023-09-01 KR KR1020230116339A patent/KR102614764B1/ko active Active
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- 2024-06-26 CL CL2024001961A patent/CL2024001961A1/es unknown
- 2024-07-12 CO CONC2024/0009279A patent/CO2024009279A2/es unknown
- 2024-07-26 ZA ZA2024/05789A patent/ZA202405789B/en unknown
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| KR20160105799A (ko) * | 2014-01-06 | 2016-09-07 | 에프. 호프만-라 로슈 아게 | 1가 혈액 뇌 장벽 셔틀 모듈 |
| KR20210005647A (ko) | 2018-04-20 | 2021-01-14 | 더 제너럴 하스피탈 코포레이션 | 혈액뇌장벽을 통한 전달을 위한 아세틸화된 프로드러그 |
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Also Published As
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|---|---|
| CL2024001961A1 (es) | 2024-11-29 |
| CA3242212A1 (en) | 2023-07-06 |
| JP7818860B2 (ja) | 2026-02-24 |
| AU2022428997A1 (en) | 2024-08-15 |
| KR20230133248A (ko) | 2023-09-19 |
| IL313919A (en) | 2024-08-01 |
| EP4458848A1 (en) | 2024-11-06 |
| ZA202405789B (en) | 2025-10-29 |
| JP2025503523A (ja) | 2025-02-04 |
| EP4458848A4 (en) | 2025-12-03 |
| KR102614764B1 (ko) | 2023-12-20 |
| MX2024008346A (es) | 2024-09-23 |
| US20250066449A1 (en) | 2025-02-27 |
| CO2024009279A2 (es) | 2024-08-08 |
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