WO2024140854A1 - 抗pdl1的抗体及其用途 - Google Patents
抗pdl1的抗体及其用途 Download PDFInfo
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- G01N33/575—Immunoassay; Biospecific binding assay; Materials therefor for cancer
- G01N33/5758—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumours, cancers or neoplasias, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides or metabolites
- G01N33/5759—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumours, cancers or neoplasias, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides or metabolites involving compounds localised on the membrane of tumour or cancer cells
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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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- C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
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- G01N2333/70532—B7 molecules, e.g. CD80, CD86
Definitions
- the present disclosure relates to the field of biomedicine, and in particular to an anti-PDL1 antibody or an antigen-binding fragment thereof and uses thereof.
- Cancer is a major disease that threatens human life and health worldwide, and with the intensification of environmental pollution, the incidence of cancer is increasing year by year.
- cancer therapies have been developed, including traditional surgical resection, radiotherapy, chemotherapy, and targeted therapies that have emerged in recent years, including small molecule targeted drug therapy, macromolecular targeted drug therapy, immune checkpoint therapy, bispecific antibodies, cell and gene therapy, etc.
- Radiotherapy and chemotherapy are generally accompanied by strong side effects and immunosuppression in patients, which can easily lead to tumor recurrence.
- immune checkpoint therapy and bispecific antibody drugs use the patient's own immune system to fight cancer, with relatively few side effects, and the patient's immune function will not be suppressed.
- PDL1 expression is significantly upregulated in a variety of tumors. It transmits immunosuppressive signals by binding to the PD-1 receptor on the surface of T cells, promotes T cell exhaustion, and reduces the patient's anti-cancer immune function. Using antibodies to block the interaction between PD-1 and PDL1 can reverse the immune exhaustion of T cells and restore anti-cancer function. So far, PD-1 antibodies such as Opdivo and Keytruda, and PDL1 antibodies such as Tecentirq (Atezolizumab) have benefited a lot of patients, but it should be noted that not all patients respond to PD-1/L1 monoclonal antibody therapy, and its overall efficacy is around 30%, and there are still more patients who cannot benefit from it.
- the present disclosure aims to solve one of the technical problems in the related art at least to some extent.
- an antibody or antigen-binding fragment comprising:
- a CDR sequence selected from at least one of the following or an amino acid sequence having at least 80% identity thereto:
- Heavy chain variable region CDR sequence SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3;
- Light chain variable region CDR sequence SEQ ID NO: 4, WAS, SEQ ID NO: 5.
- the antibodies or antigen-binding fragments provided by the present disclosure contain the above-mentioned specific CDR sequences, which can specifically bind to PDL1 highly expressed on the surface of tumor cells with high binding affinity, thereby blocking the interaction between PD-1 and PDL1 on the surface of immune cells and promoting the anti-cancer function of immune cells.
- the antibody or antigen-binding fragment comprises:
- the antibody or antigen-binding fragment comprises:
- the antibody or antigen-binding fragment includes: a heavy chain variable region as shown in SEQ ID NO:6 or SEQ ID NO:8; and/or a light chain variable region as shown in SEQ ID NO:7 or SEQ ID NO:9.
- the antibody or antigen-binding fragment comprises: a heavy chain variable region as shown in SEQ ID NO:6, and a light chain variable region as shown in SEQ ID NO:7; or a heavy chain variable region as shown in SEQ ID NO:8, and a light chain variable region as shown in SEQ ID NO:9.
- the light chain constant region and the heavy chain constant region are both from a murine IgG antibody or a mutant thereof or a human IgG antibody or a mutant thereof.
- the light chain constant region and the heavy chain constant region are both from a murine IgG1 antibody or a mutant thereof or a human IgG1 antibody or a mutant thereof.
- the N-terminus of the heavy chain constant region is connected to the C-terminus of the heavy chain variable region
- the N-terminus of the light chain constant region is connected to the C-terminus of the light chain variable region
- the antibody or antigen-binding fragment has a heavy chain having an amino acid sequence shown in any one of SEQ ID NO:10 and SEQ ID NO:12, and a light chain having an amino acid sequence shown in any one of SEQ ID NO:11 and SEQ ID NO:13.
- the antibody or antigen-binding fragment has a heavy chain with the amino acid sequence shown in SEQ ID NO:10 and a light chain with the amino acid sequence shown in SEQ ID NO:11; the antibody or antigen-binding fragment has a heavy chain with the amino acid sequence shown in SEQ ID NO:12 and a light chain with the amino acid sequence shown in SEQ ID NO:13.
- the antibody or antigen-binding fragment includes a monoclonal antibody or a polyclonal antibody; the monoclonal antibody includes a full-length antibody, Fv, a single-chain antibody, Fab, a single-domain antibody and at least one of a minimum recognition unit; the antibody or antigen-binding fragment is capable of binding to the amino acid sequence shown in SEQ ID NO:14.
- a second aspect of the present disclosure provides a bispecific binding molecule, comprising: a first binding region, the first binding region comprising the antibody or antigen-binding fragment described in the first aspect; and a second binding region, the second binding region having CD3 binding activity.
- the bispecific binding molecule comprises a symmetric bispecific binding molecule or an asymmetric bispecific binding molecule; the bispecific binding molecule is an asymmetric bispecific binding molecule.
- the second binding region comprises at least one of a full-length antibody, Fv, a single-chain antibody, Fab, a single-domain antibody, and a minimum recognition unit having CD3 binding activity.
- the second binding region comprises an anti-CD3 single chain antibody.
- the CD3 ⁇ PDL1 bispecific antibody provided by the present disclosure can bind more strongly to tumor cells and promote T cells to exert anti-cancer function.
- the anti-CD3 single-chain antibody has the amino acid sequence shown in SEQ ID NO:22.
- the first binding region further includes at least one of a first heavy chain constant region and a light chain constant region, and at least a portion of at least one of the first heavy chain constant region and the light chain constant region is derived from at least one of a human antibody, a primate antibody, and a murine antibody or a mutant thereof.
- the first heavy chain constant region and the light chain constant region are both from human IgG antibodies or mutants thereof.
- the first heavy chain constant region and the light chain constant region are both from human IgG1 antibodies or mutants thereof.
- the N-terminus of the first heavy chain constant region is connected to the C-terminus of the heavy chain variable region, and the N-terminus of the light chain constant region is connected to the C-terminus of the light chain variable region.
- the peptide chain 1 has the amino acid sequence shown in SEQ ID NO:12
- the peptide chain 2 has the amino acid sequence shown in SEQ ID NO:13.
- the peptide chain 1 and the peptide chain 2 are connected by a disulfide bond.
- the second binding region further includes a second heavy chain constant region, at least a portion of which is derived from at least one of a human antibody, a primate antibody, and a murine antibody or a mutant thereof.
- the second heavy chain constant region is derived from a human IgG antibody or a mutant thereof.
- the second heavy chain constant region is derived from a human IgG1 antibody or a mutant thereof.
- the N-terminus of the second heavy chain constant region is linked to the C-terminus of the anti-CD3 single-chain antibody.
- the first heavy chain constant region and the second heavy chain constant region are connected by a knob-into-hole structure.
- the third aspect of the present disclosure provides an isolated polynucleotide, which encodes the antibody or antigen-binding fragment of the first aspect or encodes the bispecific binding molecule of the second aspect.
- the recombinant cell is obtained by introducing the expression vector of the fourth aspect into a host cell.
- Lung cancer liver cancer, ovarian cancer, cervical cancer, skin cancer, bladder cancer, colon cancer, breast cancer, glioma, kidney cancer, stomach cancer, esophageal cancer, oral squamous cell carcinoma and head and neck cancer.
- the cancer comprises at least one of the following:
- Lung cancer liver cancer, ovarian cancer, cervical cancer, skin cancer, bladder cancer, colon cancer, breast cancer, glioma, kidney cancer, stomach cancer, esophageal cancer, oral squamous cell carcinoma and head and neck cancer.
- FIG5 is a graph showing the ELISA results of 19B8 chimeric antibody blocking the binding of PD-1 to PDL1 in one embodiment of the present disclosure
- FIG11 is a graph showing the result of CD3 ⁇ PDL1 bispecific antibody binding to PDL1 fusion protein in one embodiment of the present disclosure
- the antibodies disclosed herein include murine antibodies, chimeric antibodies, and humanized antibodies, preferably humanized antibodies.
- mutant or “variant” may refer to any naturally occurring or engineered molecule comprising one or more nucleotide or amino acid mutations.
- the "knob into hole structure” refers to the formation of a knob (Knob) and a hole (Hole) mutation in the CH3 region of the antibody heavy chain constant region to facilitate the heavy chain biting and form a heterodimer.
- the present disclosure provides an antibody (anti-PDL1 antibody) or an antigen-binding fragment that can specifically recognize PDL1, and the antibody or its antigen-binding fragment contains a CDR sequence selected from at least one of the following or an amino acid sequence that has at least 80% identity thereto: heavy chain variable region CDR sequence: SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3; light chain variable region CDR sequence: SEQ ID NO: 4, WAS, SEQ ID NO: 5.
- WAS in the CDR sequence refers to the amino acid sequence.
- the anti-PDL1 antibody or antigen-binding fragment comprises:
- the anti-PDL1 antibody or antigen-binding fragment comprises: a heavy chain variable region as shown in SEQ ID NO: 6 or SEQ ID NO: 8; and/or
- the light chain variable region as shown in SEQ ID NO:7 or SEQ ID NO:9.
- the anti-PDL1 antibody or antigen-binding fragment comprises:
- the computer program BLAST with default parameters is used, especially BLASTP or TBLASTN.
- the amino acid sequences described in the present disclosure are all shown in the manner of N-terminus to C-terminus. It should be known to those skilled in the art that the CDR sequences analyzed from different databases may be different, but these changes should be included in the scope of protection of the present disclosure.
- the antibodies of the present disclosure may be full-length (e.g., IgG1 or IgG4 antibodies) or may only contain an antigen binding portion (e.g., Fab, F(ab')2 or scFv fragments), or may be modified to affect function.
- the present disclosure includes anti-PDL1 antibodies with modified glycosylation patterns. In some applications, it may be useful to modify to remove undesirable glycosylation sites, or antibodies without the presence of fucose moieties on the oligosaccharide chains to, for example, enhance antibody-dependent cellular cytotoxicity (ADCC) function. In other applications, galactosylation modifications may be performed to alter complement-dependent cytotoxicity (CDC).
- the fragments of the present disclosure still have PDL1 binding activity, particularly the amino acid sequence shown in SEQ ID NO:10.
- the functional fragment will be composed of or contain a partial sequence of the heavy chain variable region or light chain variable region of the antibody from which it is derived, and the partial sequence is sufficient to retain the same binding specificity and sufficient affinity as the antibody from which it is derived, and for PDL1, it is preferably at least equal to 1/100 of the affinity of the antibody from which it is derived, and in a more preferred manner, at least equal to 1/10.
- Such a functional fragment will contain at least 5 amino acids, preferably 10, 15, 25, 50 and 100 consecutive amino acids of the antibody sequence from which it is derived.
- nucleic acid molecules Nucleic acid molecules, recombinant vectors, recombinant cells, immunoconjugates
- nucleic acid molecules expressing these antibodies can be connected to different vectors and then expressed in different cells to obtain the corresponding antibodies.
- the present disclosure also provides isolated nucleic acids encoding the above-mentioned antibodies or antigen-binding fragments thereof, and recombinant vectors and transformants containing the nucleic acids.
- the nucleic acid molecules encode the above-mentioned antibodies or antigen-binding fragments thereof, and the nucleic acids are preferably expression cassettes obtained by genetic engineering.
- the recombinant vector may refer to a cloning vector or an expression vector, and can be obtained by operably linking the nucleic acid to a commercially available vector (such as a plasmid or a viral vector).
- a commercially available vector such as a plasmid or a viral vector.
- Commonly used plasmids include pSeTag2, PEE14, pMH3, and the like.
- the nucleic acid molecule is species optimized and is more easily expressed in mammalian cells.
- the present disclosure also provides an expression vector, which comprises the above-mentioned isolated nucleic acid molecule.
- the polynucleotide can be directly or indirectly connected to the control elements on the vector, as long as these control elements can control the translation and expression of the polynucleotide.
- these control elements can come directly from the vector itself, or they can be exogenous, that is, they are not from the vector itself.
- the polynucleotide can be operably connected to the control element.
- operably connected means connecting the exogenous gene to the vector so that the control elements in the vector, such as transcription control sequences and translation control sequences, etc., can play their expected functions of regulating the transcription and translation of the exogenous gene.
- control elements in the vector such as transcription control sequences and translation control sequences, etc.
- the polynucleotides used to encode the heavy chain and light chain of the antibody can be inserted into different vectors separately and independently, and it is common to insert them into the same vector.
- Commonly used vectors can be, for example, plasmids, bacteriophages, etc.
- the present disclosure also provides a recombinant cell, which contains the expression vector.
- the expression vector can be introduced into mammalian cells to construct recombinant cells, and then these recombinant cells are used to express the antibodies or antigen-binding fragments provided by the present disclosure. By culturing the recombinant cells, the corresponding antibodies can be obtained.
- the host cell described in the present disclosure can be a prokaryotic host cell, a eukaryotic host cell or a bacteriophage.
- the prokaryotic host cell can be Escherichia coli, Bacillus subtilis, Streptomyces or Proteus mirabilis, etc.
- the eukaryotic host cell can be fungi including Pichia pastoris, Saccharomyces cerevisiae, Schizosaccharomyces pombe, Trichoderma, insect cells such as armyworms, plant cells such as tobacco, mammalian cells such as BHK cells, CHO cells, COS cells, myeloma cells, etc.
- the host cell described in the present disclosure is preferably a mammalian cell, more preferably a BHK cell, CHO cell, NSO cell or COS cell.
- the immunoconjugate provided by the present disclosure contains a therapeutic agent and the above-mentioned antibody or antigen-binding fragment thereof coupled to the therapeutic agent.
- the antibody or antigen-binding fragment thereof and the therapeutic agent can be coupled in a conventional manner.
- composition provided by the present disclosure contains an antibody or its antigen-binding fragment as described above, and/or the above-mentioned immunoconjugate, and a pharmaceutically acceptable carrier.
- the composition includes a combination separated in time and/or space, as long as it can work together to achieve the purpose of the present disclosure.
- the components contained in the composition can be applied to the subject as a whole, or separately to the subject. When the components contained in the composition are applied separately to the subject, each component can be applied to the subject simultaneously or sequentially.
- the present disclosure also provides a drug, which includes the above-mentioned antibody or antigen-binding fragment thereof and a pharmaceutically acceptable carrier, and may also include the above-mentioned immunoconjugate, nucleic acid molecule, expression vector, and recombinant cell.
- these pharmaceutical compositions further include a pharmaceutically acceptable carrier, including any solvent, solid excipient, diluent, binder, disintegrant, or other liquid excipient, dispersant, flavoring agent or suspending agent, surfactant, isotonic agent, thickener, emulsifier, preservative, solid binder, glidant or lubricant, etc., suitable for a specific target dosage form.
- a pharmaceutically acceptable carrier including any solvent, solid excipient, diluent, binder, disintegrant, or other liquid excipient, dispersant, flavoring agent or suspending agent, surfactant, isotonic agent, thickener, emulsifier, preservative, solid binder, glidant or lubricant, etc.
- compositions of the present disclosure may also be administered in combination with each other or with one or more other therapeutic compounds, for example, in combination with a chemotherapeutic agent. Therefore, the composition may also contain a chemotherapeutic agent.
- the antibodies or antigen-binding fragments thereof or immunoconjugates disclosed herein may also be combined with a second therapeutic agent, exemplary agents of which include but are not limited to other agents that inhibit PDL1 activity (including other antibodies or antigen-binding fragments thereof, peptide inhibitors, small molecule antagonists, etc.) and/or agents that interfere with PDL1 upstream or downstream signal transduction.
- the antibody or antigen-binding fragment thereof is administered in an effective amount, i.e., an amount sufficient to achieve the desired therapeutic and/or preventive effect, e.g., an amount that causes the prevention or alleviation of symptoms associated with the disease being treated, e.g., a disease associated with PDL1.
- an effective amount of the composition administered to the subject will depend on the type and severity of the disease, as well as on the characteristics of the individual, such as general health, age, sex, weight, and tolerance to drugs; it will also depend on the severity and type of the disease, and a person skilled in the art will be able to determine an appropriate dose based on these factors, among others.
- the kit for detecting PDL1 in a sample provided by the present disclosure contains an antibody or an antigen-binding fragment thereof as described above, a pharmaceutically acceptable carrier, an immunoconjugate, a nucleic acid molecule, an expression vector, and a recombinant cell.
- the sample can be a tissue of a patient suffering from a disease mediated by PDL1 (particularly a transplant rejection, an autoimmune disease, an infectious disease, or a cancer patient, more preferably a patient suffering from at least one of lung cancer, liver cancer, ovarian cancer, cervical cancer, skin cancer, bladder cancer, colon cancer, breast cancer, glioma, kidney cancer, gastric cancer, esophageal cancer, oral squamous cell carcinoma, and head and neck cancer).
- the kit can also include reagents conventionally used to detect PDL1, such as a coating solution, etc.
- the present disclosure also provides the antibody or antigen-binding fragment thereof, a pharmaceutically acceptable carrier, an immunoconjugate, a nucleic acid molecule, an expression vector, and a recombinant cell.
- a pharmaceutically acceptable carrier e.g., a pharmaceutically acceptable carrier
- an immunoconjugate e.g., a nucleic acid molecule
- an expression vector e.g., a cell
- a recombinant cell e.g., a recombinant cell.
- the PDL1-mediated disease is transplant rejection, an autoimmune disease, an infectious disease, or a cancer.
- the cancer is a cancer expressing PDL1.
- the cancer is at least one of lung cancer, liver cancer, ovarian cancer, cervical cancer, skin cancer, bladder cancer, colon cancer, breast cancer, glioma, kidney cancer, gastric cancer, esophageal cancer, oral squamous cell carcinoma, and head and neck cancer.
- the infectious disease includes but is not limited to HIV virus infection and/or hepatitis B virus infection.
- the present disclosure also relates to a method for preventing and/or treating a PDL1-mediated disease (as described above), the method comprising: administering an effective amount of at least one of the antibodies or antigen-binding fragments thereof, immunoconjugates and compositions of the present disclosure to a patient.
- the administration may be oral, nasal, intradermal, subcutaneous, intramuscular, intravenous or intraperitoneal.
- nucleic acids encoding the heavy and/or light chains of the antibodies of the present disclosure are within the scope of the present disclosure. According to the amino acid sequences of the heavy and/or light chains, those skilled in the art can easily obtain the corresponding nucleic acid sequences, as shown in Table 1.
- PDL1-strep Purified recombinant PDL1 extracellular domain Strep tag fusion protein
- mice were immunized three times with purified antigen and complete Freund's adjuvant, and the immune response was detected after bleeding from the tail vein.
- the serum was screened by ELISA and flow cytometry to obtain mice with anti-human PDL1 immunoglobulin.
- the spleen cells of the mice with the highest anti-PDL1 immunoglobulin were taken out and fused with mouse myeloma cells SP2/0 cells (ATCC No. CRL-1581).
- the hybridoma cells after fusion were screened for antibodies to obtain mouse monoclonal antibodies.
- the total number of candidate hybridoma cells was cultured to 10 6 , and the cells were collected by centrifugation at 800 rpm for 10 minutes, and the total RNA was extracted using the Trizol kit (Invitrogen); the total RNA was used as a template for reverse transcription to synthesize a cDNA library (Invitrogen), and the cDNA was used as a template for PCR amplification of the variable region nucleic acid sequence corresponding to the hybridoma cells.
- the primer sequences used in the PCR amplification reaction are complementary to the first framework region or signal peptide region and constant region of the antibody variable region (Larrick, JW, et al., (1990) Scand. J.
- amino acid sequence of the heavy chain variable region is shown in SEQ ID NO:6:
- amino acid sequence of the light chain variable region is shown in SEQ ID NO:7:
- PDL1 extracellular domain protein was coated into a 96-well plate, and the strength of the signal after the addition of the antibody was used to determine the binding properties of the antibody and PDL1.
- Antibody production The heavy chain and light chain nucleotide sequences of the above-mentioned antibodies were transiently transfected into ExpiCHO-S cells (Gibco, Catalog No. A29127) with pcDNA3.4 vectors (synthesized by Nanjing GenScript, mouse 19B8 heavy chain, i.e., 19B8-mIgG1 (amino acid sequence as shown in SEQ ID NO: 10) and mouse h19B8 light chain, i.e., 19B8-mK (amino acid sequence as shown in SEQ ID NO: 11), respectively to prepare antibodies.
- ExpiCHO-S cells One day before transfection, the cell density of ExpiCHO-S cells was adjusted to (3-4) ⁇ 10 6 /mL and cultured overnight at 37°C, 8% CO 2 and 95 rpm with shaking. On the day of transfection, the cells grew to 7 ⁇ 10 6 -1 ⁇ 10 7 /mL and the viability was greater than 95%, ready for transfection. The cells were diluted to 6 ⁇ 10 6 /mL using fresh pre-warmed ExpiCHO medium (Gibco, Catalog No.
- PDL1-Fc fusion protein purchased from Acro was diluted to 5 ⁇ g/mL with PBS buffer, added to a 96-well plate at a volume of 100 ⁇ L/well, and placed at 4°C overnight.
- the PBS buffer in the 96-well plate was aspirated, and the plate was washed 6 times with PBST (pH7.2 PBS containing 0.1% Tween 20) buffer, and then 200 ⁇ L/well PBS/10% BSA was added, and the plate was incubated at 37°C for 2 hours for blocking.
- PBST pH7.2 PBS containing 0.1% Tween 20
- Antibody production The heavy chain and light chain nucleotide sequences of the above antibodies were transiently transfected into ExpiCHO-S cells (Gibco, catalog number A29127) with pcDNA3.4 vectors (synthesized by Nanjing GenScript, mouse 19B8 heavy chain hIgG1LALA, i.e. 19B8-hIgG1LALA (amino acid sequence as shown in SEQ ID NO: 31), mouse h19B8 light chain hK, i.e.
- the blocking solution was removed, and the plate was washed 6 times with PBST, and then 100 ⁇ l/well of the chimeric antibody 19B8-hIgGLALA to be tested and the control antibody 12A4-hIgG1LALA diluted to an appropriate concentration with PBST/0.05% BSA were added, and incubated at 37°C for 1 hour. Remove the reaction system, wash the plate with PBST 6 times, dilute the HRP (horseradish peroxidase) labeled anti-human IgG-Fab antibody secondary antibody with PBST/0.05% BSA at 100 ⁇ l/well, and incubate at 37°C for 1 hour.
- HRP horseradish peroxidase
- HRP horseradish peroxidase-labeled strreptavidin secondary antibody
- PBST/0.05% BSA PBST/0.05% BSA
- 80 ⁇ L/well TMB tetramethylbenzidine
- 80 ⁇ L/well 4M sulfuric acid was added to terminate the reaction, wherein mIgG (purchased from Biolegend) was used as a control.
- the absorbance value was read at 450 mm using an enzyme reader. The results are shown in FIG5 , indicating that the chimeric antibody 19B8-hIgG1LALA disclosed in the present invention can block the binding of PDL1 to its receptor PD-1.
- Example 7 Flow cytometry binding experiment of human-mouse chimeric PDL1 antibody
- Human melanoma A375 cells and human lung adenocarcinoma A549 cells were diluted to 1 ⁇ 10 6 /mL with PBS, added to 1.5mL EP tubes at a volume of 100 ⁇ L/tube, and 10 ⁇ L/tube of rat serum was added thereto, and blocked at 4°C for 30min.
- Different concentrations of chimeric antibody 19B8-hIgG1LALA or control antibody 12A4-hIgG1LALA were added, and incubated at 4°C for 30min. 1mL PBS was added to the EP tube, centrifuged at 4°C, 3500rpm ⁇ 5min, the supernatant was discarded, and then washed with PBS.
- the humanized template that best matches its non-CDR region is selected.
- the CDR region of the mouse antibody is transplanted to the selected humanized template to replace the CDR region of the human template to obtain a humanized antibody.
- the embedded residues, the residues that directly interact with the CDR region, and the residues that have an important influence on the conformation of VL and VH are back mutated to obtain the humanized antibody.
- the sequence of the heavy chain variable region of the humanized PDL1 antibody is shown in SEQ ID NO:8, and the sequence of the light chain variable region is shown in SEQ ID NO:9.
- Antibody production The heavy chain and light chain nucleotide sequences of the above-mentioned antibodies were transiently transfected into ExpiCHO-S cells (Gibco, Catalog No. A29127) with pcDNA3.4 vectors (synthesized by Nanjing GenScript, humanized 19B8 heavy chain hIgG1LALA, i.e., h19B8-hIgG1LALA (amino acid sequence as shown in SEQ ID NO: 12) and humanized h19B8 light chain hK, i.e., h19B8-hK (amino acid sequence as shown in SEQ ID NO: 13) to prepare antibodies.
- ExpiCHO-S cells One day before transfection, the cell density of ExpiCHO-S cells was adjusted to (3-4) ⁇ 10 6 /mL and cultured overnight at 37°C, 8% CO 2 and 95 rpm with shaking. On the day of transfection, the cells grew to 7 ⁇ 10 6 -1 ⁇ 10 7 /mL and the viability was greater than 95%, ready for transfection. The cells were diluted to 6 ⁇ 10 6 /mL using fresh pre-warmed ExpiCHO medium (Gibco, Catalog No.
- the chromatography column was equilibrated with a pH 7.2 phosphate buffer, the supernatant was passed through the affinity chromatography column and eluted with an elution buffer (100 mM citric acid, pH 2.7), and finally concentrated and replaced with a PBS buffer.
- the purified antibody was identified by SDS-PAGE to have a purity of more than 95%, and the results showed that the above-mentioned antibody was finally obtained.
- PDL1-Fc fusion protein purchased from Acro was diluted to 5 ⁇ g/mL with PBS buffer, added to a 96-well plate at a volume of 100 ⁇ L/well, and placed at 4°C overnight.
- the PBS buffer in the 96-well plate was aspirated, and the plate was washed 6 times with PBST (pH7.2 PBS containing 0.1% Tween20) buffer, and then 200 ⁇ L/well PBS/10% BSA was added, and incubated at 37°C for 2 hours for blocking.
- PBST pH7.2 PBS containing 0.1% Tween20
- the blocking solution was removed, and the plate was washed 6 times with PBST, and then 100 ⁇ L/well of the humanized PDL1 antibody h19B8-hIgG1LALA or the control antibody 12A4-hIgG1LALA, Atezulizumab analog (purchased from Bio-Bio), 2 ⁇ g/mL PD-1-Avi tag (purchased from Acro) diluted to an appropriate concentration with PBST/0.05% BSA was added, and incubated at 37°C for 1 hour. The reaction system was removed, and the plate was washed 6 times with PBST.
- HRP horseradish peroxidase-labeled strreptavidin secondary antibody
- PBST/0.05% BSA PBST/0.05% BSA
- 80 ⁇ L/well TMB tetramethylbenzidine
- 80 ⁇ L/well 4M sulfuric acid was added to terminate the reaction, wherein mIgG (purchased from Biolegend) was used as a control.
- the absorbance value was read at 450 mm using an ELISA reader.
- Human melanoma A375 cells and human lung adenocarcinoma A549 cells were diluted to 1 ⁇ 10 6 /mL with PBS and added at a volume of 100 ⁇ L/tube. In a 1.5mL EP tube, add 10 ⁇ L/tube of rat serum and block at 4°C for 30min. Add different concentrations of humanized antibody h19B8-hIgG1LALA (heavy chain and light chain as shown in SEQ ID NO: 12-13) or control antibody 12A4-hIgG1LALA, Atezulizumab analog (purchased from Baiying Bio) and incubate at 4°C for 30min.
- FIG8 further demonstrates that the chimeric antibody of the present invention can bind to the PDL1 protein on the surface of tumor cells, and its binding is stronger than that of the control antibody 12A4 and the Atezulizumab analog.
- Example 11 Humanized PDL1 antibody promotes SEB-induced IL-2 secretion in human PBMC
- Human PBMC cells were diluted to 2 ⁇ 10 6 /mL with complete RPMI-1640 medium, added to a 96-well plate at a volume of 100 ⁇ L/well, and 50 ⁇ L/well of different concentrations of humanized antibody h19B8-hIgG1LALA or Atezulizumab analogs were added thereto, and blocked at 4°C for 30 minutes.
- PDL1 extracellular domain fusion protein was coated into 96-well plates, and the strength of the signal after the addition of the antibody was used to determine the binding properties of the antibody and PDL1.
- PDL1-Fc fusion protein was diluted to 1 ⁇ g/ml with PBS buffer, added to a 96-well plate at a volume of 100 ⁇ l/well, and placed at 4°C overnight.
- the PBS buffer in the 96-well plate was aspirated, and the plate was washed 6 times with PBST (pH7.2 PBS containing 0.1% Tween20) buffer, and then 200 ⁇ l/well PBS/10% BSA was added, and the plate was incubated at 37°C for 2 hours for blocking.
- PBST pH7.2 PBS containing 0.1% Tween20
- the blocking solution was removed, and the plate was washed 6 times with PBST, and then 100 ⁇ l/well of the humanized antibody h19B8-hIgG1LALA and the bispecific antibody CD3 ⁇ h19B8 to be tested diluted to an appropriate concentration with PBST/0.05% BSA were added, and incubated at 37°C for 1 hour. Remove the reaction system, wash the plate with PBST 6 times, dilute the HRP (horseradish peroxidase) labeled anti-human IgG-Fab secondary antibody with PBST/0.05% BSA at 100 ⁇ l/well, and incubate at 37°C for 1 hour.
- HRP horseradish peroxidase
- FIG. 10 shows several connection methods of the CD3 ⁇ PDL1 bispecific antibody disclosed in the present invention
- Figure 11 shows that the CD3 ⁇ h19B8 antibody disclosed in the present invention can bind to the PDL1 protein, and the binding ability is slightly weaker than that of the h19B8 monoclonal antibody.
- CD3 ⁇ h19B8 antibody Schematic diagram shown in FIG. 10
- CD3 ⁇ 12A4 antibody used in the examples of the present disclosure is shown in Table 2.
- Example 14 CD3 ⁇ PDL1 antibody promotes PBMC to kill tumor cells
- This example detects the killing of PBMC by bispecific antibodies.
- step (3) diluting the bispecific antibody into a series of concentration gradients using complete RPMI-1640 medium, and adding the dilution to the RTCA plate obtained in step (2) at a volume of 20 ⁇ L/well;
- step (4) The reaction system obtained in step (4) was incubated at 37°C and 5% CO2 for 24 hours using an xCELLigence RTCA MP instrument to detect the cell coefficient.
- Example 16 CD3 ⁇ PDL1 antibody promotes PBMC to kill tumor cells
- step (3) diluting the bispecific antibody into a series of concentration gradients using complete RPMI-1640 medium, and adding the dilution to the RTCA plate obtained in step (2) at a volume of 20 ⁇ L/well;
- PBMC (Sai Li Biotechnology) was diluted to 1.25 ⁇ 10 6 cells/mL with complete RPMI-1640 medium and added to the RTCA plate obtained in step (3) at a volume of 80 ⁇ L/well;
- step (4) The reaction system obtained in step (4) was incubated at 37°C and 5% CO2 for 24 hours using an xCELLigence RTCA MP instrument to detect the cell coefficient.
- FIG. 15 The specific experimental results are shown in FIG. 15 , which further demonstrates that the CD3 ⁇ h19B8 bispecific antibody disclosed herein can promote PBMC to kill A375 tumor cells, and its killing ability is comparable to or slightly better than that of the control antibody CD3 ⁇ 12A4.
- NCG mice were subcutaneously injected with 1 ⁇ 10 6 human melanoma A375 cells per mouse on the right flank;
- mice On days 8, 11, 14, and 17, the mice were injected with the CD3 ⁇ h19B8(a) antibody via tail vein, 25 ⁇ g per mouse;
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Abstract
Description
Claims (59)
- 一种抗体或抗原结合片段,其中,包括:选自下列至少之一的CDR序列或与其具有至少80%同一性的氨基酸序列:重链可变区CDR序列:SEQ ID NO:1、SEQ ID NO:2、SEQ ID NO:3;轻链可变区CDR序列:SEQ ID NO:4、WAS、SEQ ID NO:5。
- 根据权利要求1所述的抗体或抗原结合片段,其中,包括:SEQ ID NO:1所示的重链可变区CDR1序列,SEQ ID NO:2所示的重链可变区CDR2,SEQ ID NO:3所示的重链可变区CDR3,SEQ ID NO:4所示的轻链可变区CDR1,WAS所示的轻链可变区CDR2,SEQ ID NO:5所示的轻链可变区CDR3。
- 根据权利要求1所述的抗体或抗原结合片段,其中,包括下列至少之一:(a)具有SEQ ID NO:6所示的重链可变区和SEQ ID NO:7所示的轻链可变区;与(a)相比,序列同一性至少在80%的氨基酸序列。
- 根据权利要求1所述的抗体或抗原结合片段,其中,包括下列至少之一:(b)具有SEQ ID NO:8所示的重链可变区和SEQ ID NO:9所示的轻链可变区;与(b)相比,序列同一性至少在80%的氨基酸序列。
- 根据权利要求1所述的抗体或抗原结合片段,其中,包括:如SEQ ID NO:6或SEQ ID NO:8所示的重链可变区;和/或如SEQ ID NO:7或SEQ ID NO:9所示的轻链可变区。
- 根据权利要求5所述的抗体或抗原结合片段,其中,包括:如SEQ ID NO:6所示的重链可变区,和如SEQ ID NO:7所示的轻链可变区;或如SEQ ID NO:8所示的重链可变区,和如SEQ ID NO:9所示的轻链可变区。
- 根据权利要求1~6中任一项所述的抗体或抗原结合片段,其中,所述抗体或抗原结合片段含有重链恒定区和轻链恒定区的至少之一,所述重链恒定区和轻链恒定区的至少之一的至少一部分来自于灵长目源抗体和鼠源抗体或其突变体中的至少之一。
- 根据权利要求1~7中任一项所述的抗体或抗原结合片段,其中,所述轻链恒定区和重链恒定区均来自于鼠源IgG抗体或其突变体或人源IgG抗体或其突变体。
- 根据权利要求1~7中任一项所述的抗体或抗原结合片段,其中,所述轻链恒定区和重链恒定区均来自于鼠源IgG1抗体或其突变体或人源IgG1抗体或其突变体。
- 根据权利要求1~8中任一项所述的抗体或抗原结合片段,其中,所述重链恒定区的N端与所述重链可变区的C端相连,所述轻链恒定区的N端与所述轻链可变区的C端相连。
- 根据权利要求1~10中任一项所述的抗体或抗原结合片段,其中,所述抗体或抗原结合片段具有SEQ ID NO:10、SEQ ID NO:12任一项所示氨基酸序列的重链和具有SEQ ID NO:11、SEQ ID NO:13任一项所示氨基酸序列的轻链。
- 根据权利要求1~11中任一项所述的抗体或抗原结合片段,其中,所述抗体或抗原结合片段具有SEQ ID NO:10所示氨基酸序列的重链和SEQ ID NO:11所示氨基酸序列的轻链;所述抗体或抗原结合片段具有SEQ ID NO:12所示氨基酸序列的重链和SEQ ID NO:13所示氨基酸序列的轻链。
- 根据权利要求1~12中任一项所述的抗体或抗原结合片段,其中,所述抗体或抗原结合片段包括单抗或多抗。
- 根据权利要求1~13中任一项所述的抗体或抗原结合片段,其中,所述单抗包括全长抗体、Fv、单链抗体、Fab、单域抗体以及最小识别单位中的至少之一。
- 根据权利要求1~13中任一项所述的抗体或抗原结合片段,其中,所述抗体或抗原结合片段能够结合SEQ ID NO:14所示的氨基酸序列。
- 一种双特异性结合分子,其中,包括:第一结合区,所述第一结合区包含权利要求1~15任一项所述的抗体或抗原结合片段;和第二结合区,所述第二结合区具有CD3结合活性。
- 根据权利要求16所述的双特异性结合分子,其中,所述双特异性结合分子包括对称双特异性结 合分子或不对称双特异性结合分子。
- 根据权利要求16或17所述的双特异性结合分子,其中,所述双特异性结合分子为非对称双特异性结合分子。
- 根据权利要求16~18中任一项所述的双特异性结合分子,其中,所述第一结合区包含肽链1和肽链2,其中,所述肽链1包括权利要求1~15任一项中所述的重链可变区,所述肽链2包括权利要求1~15任一项中所述的轻链可变区。
- 根据权利要求16~19中任一项所述的双特异性结合分子,其中,所述第二结合区包括具有CD3结合活性的全长抗体、Fv、单链抗体、Fab、单域抗体以及最小识别单位中的至少之一。
- 根据权利要求16~20中任一项所述的双特异性结合分子,其中,所述第二结合区包括抗CD3单链抗体。
- 根据权利要求16~21中任一项所述的双特异性结合分子,其中,所述抗CD3单链抗体包括抗CD3抗体重链可变区和抗CD3抗体轻链可变区,其中,所述抗CD3抗体重链可变区包括SEQ ID NO:15所示的重链可变区CDR1序列,SEQ ID NO:16所示的重链可变区CDR2,SEQ ID NO:17所示的重链可变区CDR3;所述抗CD3抗体轻链可变区具有SEQ ID NO:18所示的轻链可变区CDR1,GTN所示的轻链可变区CDR2,SEQ ID NO:19所示的轻链可变区CDR3。
- 根据权利要求16~22中任一项所述的双特异性结合分子,其中,所述抗CD3单链抗体包括SEQ ID NO:20所示的重链可变区和SEQ ID NO:21所示的轻链可变区。
- 根据权利要求16~23中任一项所述的双特异性结合分子,其中,所述抗CD3单链抗体进一步包括连接肽,其中,所述连接肽的N端与所述抗CD3抗体重链可变区的C端相连,所述连接肽的C端与所述抗CD3抗体轻链可变区的N端相连;或所述连接肽的N端与所述抗CD3抗体轻链可变区的C端相连,所述连接肽的C端与所述抗CD3抗体重链可变区的N端相连。
- 根据权利要求16~24中任一项所述的双特异性结合分子,其中,所述连接肽具有氨基酸序列(GGGGS)n,其中n为大于或等于1的整数,优选为1、2、3、4、5、6、7、8、9或10。
- 根据权利要求16~25中任一项所述的双特异性结合分子,其中,所述抗CD3单链抗体具有如SEQ ID NO:22所示的氨基酸序列。
- 根据权利要求16~26中任一项所述的双特异性结合分子,其中,所述第一结合区进一步包括第一重链恒定区和轻链恒定区的至少之一,所述第一重链恒定区和轻链恒定区的至少之一的至少一部分来自于人源抗体、灵长目源抗体和鼠源抗体或其突变体中的至少之一。
- 根据权利要求16~27中任一项所述的双特异性结合分子,其中,所述第一重链恒定区和轻链恒定区均来自人源IgG抗体或其突变体。
- 根据权利要求16~28中任一项所述的双特异性结合分子,其中,所述第一重链恒定区和轻链恒定区均来自人源IgG1抗体或其突变体。
- 根据权利要求16~29中任一项所述的双特异性结合分子,其中,所述第一重链恒定区的N端与所述重链可变区的C端相连,所述轻链恒定区的N端与所述轻链可变区的C端相连。
- 根据权利要求16~30中任一项所述的双特异性结合分子,其中,所述肽链1具有SEQ ID NO:12所示氨基酸序列,所述肽链2具有SEQ ID NO:13所示氨基酸序列。
- 根据权利要求16~31中所述的双特异性结合分子,其中,所述肽链1和肽链2通过二硫键相连。
- 根据权利要求16~32中任一项所述的双特异性结合分子,其中,所述第二结合区进一步包括第二重链恒定区,所述第二重链恒定区的至少一部分来自于人源抗体、灵长目源抗体和鼠源抗体或其突变体中的至少之一。
- 根据权利要求16~33中任一项所述的双特异性结合分子,其中,所述第二重链恒定区来自于人源IgG抗体或其突变体。
- 根据权利要求16~34中任一项所述的双特异性结合分子,其中,所述第二重链恒定区来自于人源IgG1抗体或其突变体。
- 根据权利要求16~35中任一项所述的双特异性结合分子,其中,所述第二重链恒定区的N端与所述抗CD3单链抗体的C端相连。
- 根据权利要求16~36中任一项所述的双特异性结合分子,其中,所述第一重链恒定区和所述第二 重链恒定区通过knob-into-hole结构进行连接。
- 一种分离的多核苷酸,其中,所述多核苷酸编码权利要求1~15中任一项所述的抗体或抗原结合片段或编码权利要求16~37中任一项所述的双特异性结合分子。
- 一种表达载体,其中,携带权利要求38所述的多核苷酸。
- 一种重组细胞,其中,携带权利要求38所述的多核苷酸、权利要求39所述的表达载体或能够表达权利要求1~15中任一项所述的抗体或抗原结合片段或编码权利要求16~37中任一项所述的双特异性结合分子。
- 根据权利要求40所述的重组细胞,其中,所述重组细胞是通过将权利要求39所述的表达载体导入至宿主细胞中而获得的。
- 根据权利要求41所述的重组细胞,其中,所述重组细胞为真核细胞。
- 根据权利要求41所述的重组细胞,其中,所述重组细胞为哺乳动物细胞。
- 一种组合物,其中,包括权利要求1~15中任一项所述的抗体或抗原结合片段、权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞。
- 一种制备权利要求1~15中任一项所述的抗体或抗原结合片段或权利要求16~37中任一项所述的双特异性结合分子的方法,其中,包括培养权利要求40~43中任一项所述的重组细胞。
- 一种药物,其中,包括权利要求1~15中任一项所述的抗体或抗原结合片段、权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞或权利要求44所述的组合物。
- 一种试剂盒,其中,所述试剂盒含有权利要求1~15中任一项所述的抗体或抗原结合片段、权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞。
- 权利要求1~15中任一项所述的抗体或抗原结合片段、权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞或权利要求47所述的组合物在制备药物中的用途,所述药物用于预防和/或治疗PDL1介导的相关疾病。
- 根据权利要求48所述的用途,其中,所述PDL1介导的相关疾病包括癌症。
- 根据权利要求49所述的用途,其中,所述癌症包括选自以下中的至少之一:肺癌、肝癌、卵巢癌、宫颈癌、皮肤癌、膀胱癌、结肠癌、乳腺癌、神经胶质瘤、肾癌、胃癌、食道癌、口腔鳞状细胞癌和头颈癌。
- 权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞或权利要求47所述的组合物在制备药物中的用途,所述药物用于预防和/或治疗PDL1和CD3介导的相关疾病。
- 根据权利要求51所述的用途,其中,所述PDL1和CD3介导的相关疾病包括癌症。
- 根据权利要求52所述的用途,其中,所述癌症包括下列中的至少之一:肺癌、肝癌、卵巢癌、宫颈癌、皮肤癌、膀胱癌、结肠癌、乳腺癌、神经胶质瘤、肾癌、胃癌、食道癌、口腔鳞状细胞癌和头颈癌。
- 权利要求1~15中任一项所述的抗体或抗原结合片段、权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞在制备试剂盒中的用途,所述试剂盒用于检测PDL1。
- 权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞在制备试剂盒中的用途,所述试剂盒用于检测PDL1和/或CD3。
- 权利要求1~15中任一项所述的抗体或抗原结合片段、权利要求16~37中任一项所述的双特异性结合分子、权利要求38所述的多核苷酸、权利要求39所述的表达载体、权利要求40~43中任一项所述的重组细胞、权利要求44所述的组合物或权利要求46所述的药物在预防或治疗疾病中的用途,所述疾病包括癌症,所述癌症的癌细胞表面PDL1呈阳性。
- 根据权利要求56所述的用途,其中,所述癌症选自:肺癌、肝癌、卵巢癌、宫颈癌、皮肤癌、 膀胱癌、结肠癌、乳腺癌、神经胶质瘤、肾癌、胃癌、食道癌、口腔鳞状细胞癌和头颈癌中的至少之一。
- 一种预防或治疗肿瘤的方法,其中,包括向受试者施用以下中的至少之一:权利要求1~15中任一项所述的抗体或抗原结合片段;权利要求16~37中任一项所述的双特异性结合分子;权利要求38所述的多核苷酸;权利要求39所述的表达载体;权利要求40~43中任一项所述的重组细胞;权利要求44所述的组合物;权利要求46所述的药物。
- 根据权利要求58所述的方法,其中,所述肿瘤的肿瘤细胞表面PDL1呈阳性,所述肿瘤选自肺癌、肝癌、卵巢癌、宫颈癌、皮肤癌、膀胱癌、结肠癌、乳腺癌、神经胶质瘤、肾癌、胃癌、食道癌、口腔鳞状细胞癌和头颈癌中的至少之一。
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| JP2025538573A JP2026503979A (ja) | 2022-12-31 | 2023-12-27 | 抗pdl1抗体及びその使用 |
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| CN118027196B (zh) * | 2023-06-25 | 2025-12-02 | 合肥天港免疫药物有限公司 | 抗cd3抗体及其应用 |
| CN119569886A (zh) * | 2023-09-06 | 2025-03-07 | 合肥天港免疫药物有限公司 | 双特异性抗体及其应用 |
| CN121851177A (zh) * | 2023-12-11 | 2026-04-14 | 合肥天港免疫药物有限公司 | 双特异性抗体及其应用 |
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| EP4640712A4 (en) | 2026-04-08 |
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