EP3735428A2 - Anticorps dirigé contre le sous-type a des récepteurs aux endothélines et ses utilisations - Google Patents
Anticorps dirigé contre le sous-type a des récepteurs aux endothélines et ses utilisationsInfo
- Publication number
- EP3735428A2 EP3735428A2 EP19744751.9A EP19744751A EP3735428A2 EP 3735428 A2 EP3735428 A2 EP 3735428A2 EP 19744751 A EP19744751 A EP 19744751A EP 3735428 A2 EP3735428 A2 EP 3735428A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- antibody
- identity
- seq
- amino acid
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2869—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against hormone receptors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/575—Immunoassay; Biospecific binding assay; Materials therefor for cancer
- G01N33/57557—Immunoassay; Biospecific binding assay; Materials therefor for cancer of other specific parts of the body, e.g. brain
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/74—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving hormones or other non-cytokine intercellular protein regulatory factors such as growth factors, including receptors to hormones and growth factors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
- C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
- C07K2317/565—Complementarity determining region [CDR]
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
- C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
Definitions
- the present invention belongs to the technical field of antibodies, their therapeutic and diagnostic use as well as their use as a research tool.
- the present invention provides an antibody, advantageously monoclonal, specific for the native and functional conformation of endothelin receptor subtype A (ETA-R) and in particular human endothelin receptors expressed on the surface of glial cells such as glioma or glioblastoma cells.
- ETA-R endothelin receptor subtype A
- glial cells such as glioma or glioblastoma cells.
- the present invention also relates to the use of these antibodies for therapeutic and diagnostic purposes as well as for research purposes.
- Endothelin receptors (designated ET1, ET2 and ET3 in humans) belong to the family of receptors with 7 transmembrane domains also called GPCRs for "G-protein Coupled Receptors". Endothelin receptors have two main subtypes in humans: subtype A (ETA-R) and subtype B (ETB-R). The fact that these receptors are classified in the family of GPCRs gives them a complex three-dimensional structure, closely related to the membrane context in which they are located.
- GPCRs G-protein Coupled Receptors
- endothelin-receptor-overexpressing tumor cells are found in a microenvironment rich in ET-1 which will then bind to the endothelin A or B receptor resulting in a conformational change of endothelin in an "activated" configuration. Over-represented on the surface of these same tumor cells.
- the endothelin receptor subtype A also has a modification of its level of expression, in particular in colorectal cancer, in breast cancer, ovarian cancer, in glioblastomas (brain tumors). ) and in cases of bladder cancer [9].
- endothelin axis and its receptors are also involved in several pathophysiological functions and dysfunctions.
- Kondoh et al, 1990 [12] describes the binding properties of 4 monoclonal antibodies (A2, G9, E7 and G10) to solubilized endothelin receptor complexes present on the surface of rat lung membranes.
- the G9 and G10 antibodies are G-type and Isotype 2a immunoglobulins (IgG2a), whereas the A2 and E7 antibodies are IgG1 immunoglobulins. While these four antibodies are indeed specific for endothelin-solubilized receptors, Kondoh et al, 1990 [12] provides no information about the fine specificity of these antibodies (ETA-R and / or ETB-R), as to the recognition of receptors of human origin, nor as to their properties.
- Patent application CA 2 971 491 [13] describes twelve antibodies specific for human endothelin receptor subtype A, designated A-1 to A-12. These antibodies have antagonistic properties and are capable of inhibiting the signaling pathway involving ET1. For this reason, patent application CA 2 971 491 envisages using these antibodies in the treatment of pulmonary arterial hypertension.
- the inventors have therefore set themselves the goal of obtaining an antibody capable of targeting particular conformers of the subtype A of the endothelin receptor. expressed on the surface of cancer cells and, in particular, on the surface of human cancer cells.
- the present invention makes it possible to solve the technical problems as previously defined and to achieve the goal that the inventors have set themselves.
- Rendomab-A63 or RA63 a monoclonal antibody directed against the subtype A endothelin receptors and in particular human subtype A, hereinafter called Rendomab-A63 or RA63.
- This antibody does not antagonize the pharmacological properties of endothelin receptor subtype A (ETA-R).
- the antibody according to the present invention is not capable of diminishing, inhibiting or blocking one or more biological activity (s) of ETA-R.
- the antibody according to the present invention is capable of recognizing the particular conformers of the endothelin receptor subtype A expressed on the surface of cancerous cells and in particular of glioblastoma cells.
- the present invention relates to an antibody directed against endothelin receptor subtype A, a fragment or derivative thereof. this.
- antibody and “immunoglobulin” are equivalent and may be used interchangeably in the present invention.
- An antibody is a glycoprotein comprising at least two heavy chains (H) and at least two light chains (L) interconnected by one or more disulfide bridges.
- Each heavy chain comprises a variable region (or domain) (VH) and a constant region comprising 3 domains, usually designated CH1, CH2 and CH3.
- Each light chain comprises a variable region (or domain) (VL) and a constant region comprising a single domain, usually designated CL.
- the variable regions of the heavy and light chains involved in antigen recognition can be further subdivided into 3 hypervariable regions, also called complementarity determining regions (CDRs), framed by 4 more conserved regions, also called framework regions. (EN).
- CDRs complementarity determining regions
- each heavy chain (or light chain) variable region is, from the N-terminus to the C-terminus, as follows: FRI, CDR1, FR2, CDR2, FR3, CDR3 and FR4.
- CDR and FR that has been used is that of the IMGT (the international ImMunoGeneTics database http://imgt.cines.fr:8104). The calculations of the percentages of identity of the CDR sequences mentioned and claimed hereafter are therefore to be taken into account on the basis of this annotation.
- antibody includes, in the context of the present invention, not only complete antibody molecules but also fragments and derivatives thereof.
- antibody fragment is meant, in the context of the present invention, both a monovalent fragment which has a single antigen-binding site and a divalent fragment which has two antigen-combining sites. .
- a fragment according to the invention has at least one antigen binding site.
- Fab fragment which retain the antigen binding site
- Fd heavy chain
- a fragment F (ab ') 2 is a divalent fragment corresponding to the association of two Fab fragments connected by the disulfide bridges present at the hinge region of immunoglobulins ("Hinge") located between the constant CH1 and CH2 domains.
- a Fv fragment is a monovalent fragment consisting only of the variable regions VL and VH of the light and heavy chains of an antibody.
- An scFv fragment is a monovalent polypeptide fragment, obtained only by genetic engineering, corresponding to the variable domains linked by a peptide bond.
- a diabody is a recombinant and divalent antibody molecule consisting of two scFv molecules upside down because of a peptide link that is too short to allow the formation of scFv.
- the fragments according to the invention also cover the fragments as mentioned above, the half-life of which has been increased by chemical modification, in particular by incorporation into a liposome or by the introduction of a poly (alkylene) glycol such as a polyethylene.
- a poly (alkylene) glycol such as a polyethylene.
- glycol (PEG) this technique being called “PEGylation” and giving fragments such as Fab-PEG, F (ab ') 2 -PEG or Fv-PEG.
- antibody derivative is meant, in the context of the present invention, fragments of antibodies obtained by genetic engineering such as single chain Fv (scFv) and single domain (dAb) antibodies.
- scFv single chain Fv
- dAb single domain
- the term also includes antibody-like molecules that can be produced using phage display techniques or other random selection techniques for molecules that bind to subtype A receptors. endothelins or specific regions of this subtype.
- the "antibody fragments” and “antibody derivatives” cover all molecules that contain a structure, advantageously peptide, which is part of the recognition site (that is, the part of the antibody which binds to or combines with the epitope or antigen) of an antibody according to the present invention.
- the fragments and antibody derivatives according to the present invention are able to recognize the particular conformers of the endothelin receptor subtype A expressed on the surface of cancer cells and in particular glioblastoma cells.
- the present invention relates to an antibody directed against the subtype A endothelin receptors having:
- - CDRIL has at least 60% identity with the following amino acid sequence: SQSIVYSNGKIYL (SEQ ID NO: 2);
- - CDR2L has at least 60% identity with the following amino acid sequence: KVS;
- CDR3L has at least 60% identity with the following amino acid sequence: FQGSHLPLT (SEQ ID NO: 4); and
- - CDRIH has at least 60% identity with the following amino acid sequence: GFTFNIYA (SEQ ID NO: 6);
- IRSKSNNYAT SEQ ID NO: 8
- VSSYYSGSFFAY (SEQ ID NO: 10)
- amino acid sequences are given in accordance with the international 1-letter code.
- the antibodies designated A-7, A-8 and A-9 have at least one light chain variable region close in terms of amino acid sequence of the variable light chain region of the antibody according to the invention but the amino acid sequences of the heavy chain variable region and in particular the amino acid sequences of CDR2H and CDR3H antibodies A-7, A-8 and A-9 are far removed from the amino acid sequence of the heavy chain variable region of the antibody according to the invention.
- the antibody according to the present invention has at least one light chain variable region whose CDR1 (ie CDRIL) has at least 60% identity, at least 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the acid sequence following amines: SQ.SIVYSNGKIYL (SEQ ID NO: 2).
- the antibody according to the present invention has at least one light chain variable region whose CDR2 (ie CDR2L) has at least 60% identity, at least 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the acid sequence following amines: KVS.
- CDR2L CDR2L
- the antibody according to the present invention has at least one light chain variable region whose CDR3 (ie CDR3L) has at least 60% identity, at least 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the acid sequence following amino acids: FQGSHLPLT (SEQ ID NO: 4).
- the identity percentages of the various CDRs in the light chain variable region are independent of one another.
- CDR2L may have at least 65% with the following amino acid sequence: KVS
- CDR3L may have at least 70% identity with the following amino acid sequence: FQGSHLPLT (SEQ ID NO: 4) .
- FQGSHLPLT SEQ ID NO: 4
- the antibody according to the present invention comprises at least one variable light chain region whose amino acid sequence:
- CDRIL is SQSIVYSNGKIYL (SEQ ID NO: 2); - CDR2 L is KVS; and
- CDR3 L is FQGSHLPLT (SEQ ID NO: 4).
- the antibody according to the present invention comprises at least one light chain variable region whose amino acid sequence has at least 60% identity with the following sequence:
- the antibody according to the present invention may comprise at least one light chain variable region whose amino acid sequence has at least 65% identity, at least 70% identity, at least 75% identity. , at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the sequence SEQ ID NO: 12.
- the antibody according to the present invention may comprise at least one light chain variable region whose amino acid sequence corresponds to the sequence SEQ ID NO: 12.
- the antibody according to the present invention has at least one heavy chain variable region whose CDR1 (ie CDRIH) has at least 60% identity, at least 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the acid sequence following amines: GFTFNIYA (SEQ ID NO: 6).
- the antibody according to the present invention has at least one heavy chain variable region whose CDR2 (ie CDR2H) has at least 60% identity, at least 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the acid sequence following amines: I RSKSN NYAT (SEQ ID NO: 8).
- the antibody according to the present invention has at least one heavy chain variable region whose CDR3 (ie CDR3H) has at least 60% identity, at least less than 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95 % identity, at least 98% identity with the following amino acid sequence: VSSYYSGSFFAY (SEQ ID NO: 10).
- the identity percentages of the various CDRs in the heavy chain variable region are independent of one another.
- CDR2H may have at least 75% with the following amino acid sequence: RSKSNNYAT (SEQ ID NO: 8), while CDR3L may have at least 65% identity with the following amino acid sequence : VSSYYSGSFFAY (SEQ ID NO: 10).
- RSKSNNYAT SEQ ID NO: 8
- CDR3L may have at least 65% identity with the following amino acid sequence : VSSYYSGSFFAY (SEQ ID NO: 10).
- the antibody according to the present invention comprises at least one heavy chain variable region whose amino acid sequence:
- CDRIH is GFTFN IYA (SEQ ID NO: 6);
- VSSYYSGSFFAY (SEQ ID NO: 10).
- the antibody according to the present invention comprises at least one heavy chain variable region whose amino acid sequence has at least 60% identity with the following sequence:
- the antibody according to the present invention may comprise at least one heavy chain variable region whose amino acid sequence has at least 65% identity, at least 70% identity, at least 75% identity. , at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the sequence SEQ ID NO: 14. More particularly, the antibody according to the present invention may comprise at least one heavy chain variable region whose amino acid sequence corresponds to the sequence SEQ. ID NO: 14
- the antibody according to the invention has at least one light chain variable region and at least one heavy chain variable region as previously defined.
- the antibody according to the invention has at least one light chain variable region comprising a CDRIL, a CDR2L and a CDR3L as defined above and at least one heavy chain variable region comprising a CDRIH, a CDR2H and a CDR3H such as than previously defined.
- the light chain of the antibody according to the invention is typically a kappa light chain.
- the heavy chain of the antibody according to the invention is in particular a gamma heavy chain 2b.
- the antibody according to the present invention is a type G immunoglobulin.
- the antibody according to the present invention is a lgG2b / kappa type immunoglobulin.
- the antibody directed against the endothelin receptor subtype A, object of the present invention selectively binds extracellular segments of ETA-R.
- antibody which selectively binds at least one specified domain or region of ETA-R, especially human ETA-R, is meant, in the context of the present invention, an antibody which binds the domain (s) specific with greater affinity than any other region of ETA-R.
- the antibody binds the specified ETA-R domain (s) with an affinity of at least 2, or at least 5, or at least 10, or at least 50 times greater than that which it is present for any other region of ETA-R.
- This binding can be determined by methods well known in the art such as flow cytometry, radioimmunoassay (RIA), confocal microscopy, enzymo-immunoassay labeling (EIA) by direct or indirect revelation of the antibody to test (ELISA).
- the antibody which is the subject of the present invention may be obtained from an animal immunized with subtype A endothelin receptors or against a fragment of this receptor comprising the epitope (s) recognized by the antibody according to the present invention.
- the immunized animal may be any animal usually used for the production of antibodies such as a mouse, a rat, a rabbit, a goat, a dog, a horse or a camelid such as camel or llama.
- the antibody which is the subject of the present invention can also be obtained from a library of antibodies or antibody fragments selected against endothelin receptor subtype A or against a fragment of this receptor comprising (s) epitope (s) recognized by the antibody according to the present invention.
- the library of antibodies or antibody fragments can be generated from any animal usually used for the production of antibodies such as a mouse, a rat, a rabbit, a goat, a dog, a horse or a camelid such as camel or lama but also from a non-human primate or a human.
- the antibody thus obtained can be purified on an affinity column on which the endothelin receptor subtype A or one of the sequences recognized specifically by the antibody according to the invention has been immobilized beforehand.
- This purification may also involve affinity chromatography on protein A.
- the antibody may be a polyspecific or monospecific polyclonal antibody, or a monoclonal antibody.
- the antibody of the present invention is monoclonal.
- a “monoclonal antibody” refers, by definition in immunology, to an antibody obtained from a substantially homogeneous antibody population i.e. a population of identical antibodies, a relatively small amount of which may possibly have a mutation.
- a monoclonal antibody is obtained from the proliferation of a single cell clone such as a hybridoma.
- the antibody according to the present invention is the murine monoclonal antibody obtained from the hybridoma deposited at the CNCM (for "National Collection of Cultures of Microorganisms", Institut Pasteur, 25 rue du Dr. Roux, 75724 PARIS Cedex 15) October 18, 2017 under the number CNCM 1-5250 (Rendomab-A63).
- the present invention also relates to such a hybridoma.
- the antibody according to the present invention may be a chimeric antibody ie an antibody which contains variable regions or hypervariable regions of heavy and light chain (s) derived from an antibody of a species given in combination with heavy and light chain constant regions derived from an antibody of another species heterologous to the previous one.
- a chimeric antibody ie an antibody which contains variable regions or hypervariable regions of heavy and light chain (s) derived from an antibody of a species given in combination with heavy and light chain constant regions derived from an antibody of another species heterologous to the previous one.
- a first variant of the present invention corresponds to a chimericized antibody and in particular a chimeric monoclonal antibody, that is to say an antibody whose variable domains derived from the murine antibody previously described are associated with constant domains of human origin. . It should be recalled that several therapeutic antibodies used in humans are chimerised antibodies.
- a second particularly advantageous variant may be a humanized antibody and in particular a humanized monoclonal antibody. Indeed, it is preferable to use a humanized antibody, if the latter is to be administered repeatedly to a human subject.
- a humanized monoclonal antibody in the case of a humanized monoclonal antibody according to the present invention, the latter may be prepared by insertion of the CDRs of a murine antibody and in particular of the murine antibody derived from the hybridoma deposited at the CNCM on October 18, 2017 under the number CNCM 1-5250 in a human antibody, regardless of its isotype (IgG, IgA, IgM).
- Humanized antibodies can be made using the techniques and approaches described in Verhoeyen et al, 1988 [16] and in US Patent 4,816,567 [17].
- the antibodies may also be human antibodies in the sense that they have the amino acid sequence of human anti-ETA-R antibodies via methods of preparation known in the art that do not require vaccination of humans.
- such antibodies can be obtained by gene immunization / transgenic mouse cell immunization boosters that are available and which essentially contain human immunoglobulin genes (see Vaughan et al, 1998 [18]).
- such antibodies can be obtained by cloning cDNAs encoding human B cells against ETA-R.
- the present invention also relates to an isolated polynucleotide chosen from the following polynucleotides:
- y a polynucleotide of at least 18 nucleotides, capable of hybridizing under conditions of high stringency to the polynucleotides as defined in points (a) and (b).
- polynucleotide in the context of the present invention a nucleic acid, a nucleic sequence, a nucleic acid sequence, an oligonucleotide, a polynucleotide sequence, a nucleotide sequence, a single-stranded DNA, a double DNA -branch or RNA.
- a polynucleotide according to the present invention may comprise natural nucleotides and unnatural nucleotides.
- the polynucleotide according to the invention does not correspond to a nucleotide sequence in its natural state i.e. in its natural chromosomal environment. On the contrary, the polynucleotide according to the invention has been isolated and optionally purified, and its environment has consequently been modified.
- the polynucleotide according to the invention can also be obtained by genetic recombination or by chemical synthesis.
- the conditions of high stringency correspond to temperature and ionic strength conditions which make it possible to maintain hybridization between two complementary nucleotide sequences.
- Those skilled in the art will be able to determine the most stringent conditions of high stringency, in particular as a function of the size of the nucleotide sequences, and this, with reference to the teaching of Sambrook et al, 1989
- the polynucleotide according to the present invention comprises: i ') at least one nucleotide sequence encoding a light chain variable region and comprising: - a sequence encoding the st CDRIL and having at least 60% identity with the nucleotide sequence: CAG AGC AGT ATT TAT AGT GTA AAT GGA AAA ATC TT A T AT (SEQ ID NO: 1);
- a 2nd sequence coding for CDR2H has at least 60% identity with the following nucleotide sequence: ATA AGA AGT AAA AGT AAT AAT TAT GCA ACA (SEQ ID NO: 7);
- the polynucleotide according to the present invention has at least one nucleotide sequence encoding a variable region light chain and having a sequence encoding the era CDRIL, said the era sequence having at least 60% identity, at least 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the following nucleotide sequence: AGT CAG AGC ATT GTA TAT AGT AAT GGA ATC AAA ATAT TTA (SEQ ID NO: 1).
- the polynucleotide according to the present invention has at least one nucleotide sequence encoding a variable region light chain and having a sequence encoding the 2nd CDR2L, said 2 nd sequence having at least 60% identity, less than 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95 % identity, at least 98% identity with the following nucleotide sequence: AAA GTT TCC.
- the polynucleotide according to the present invention has at least one nucleotide sequence encoding a variable region light chain and having a sequence encoding the 3 rd CDR3L, said 3 rd sequence and has at least 60% identity, at least 65% identity , at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least at least 98% identity with the following nucleotide sequence: TTT CAA GGT TCA CTC CATT CCG CTC ACG (SEQ ID NO: 3).
- the identity percentages of the sequences encoding the different CDRs in a variable light chain region are independent of one another.
- the sequence coding for CDR2L may have at least 65% with the following nucleotide sequence: AAA GTT TCC, while the sequence encoding CDR3L may have at least 70% identity with the nucleotide sequence (SEQ ID NO: 3 ).
- SEQ ID NO: 3 the nucleotide sequence
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a light chain variable region and comprising:
- the polypeptide obtained after translation polynucleotide according to the invention comprises 3 peptide sequences having at least 60% identity and advantageously 100% identity with the CDRIL, CDR2L and CDR3L of the variable region of the light chain as previously defined.
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a light chain variable region whose nucleotide sequence has at least 60% identity with the following sequence:
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a light chain variable region whose nucleotide sequence has at least 65% identity, at least 70% identity, at least 75% identity. , at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the sequence SEQ ID NO: 11.
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a light chain variable region whose nucleotide sequence corresponds to the sequence SEQ ID NO: 11.
- the polynucleotide according to the present invention also has at least one nucleotide sequence encoding a variable heavy chain region and having a sequence encoding the the era CDRIH, the said sequence era having at least 60% identity, at least 65% identity , at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least at least 98% identity with the following nucleotide sequence: GGA TTC ACC TTC ATC ATC TAC GCC (SEQ ID NO: 5).
- the polynucleotide according to the present invention has at least one nucleotide sequence encoding a variable heavy chain region and having a 2nd sequence encoding the CDR2H, said 2 nd sequence having at least 60% identity, at least 65% identity, at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the following nucleotide sequence: ATA AGA AGT AAA AGT AAT AT AT G CA ACA (SEQ ID NO: 7).
- the polynucleotide according to the present invention has at least one nucleotide sequence encoding a variable heavy chain region and having a sequence encoding the 3 rd CDR3H, said 3 rd sequence and has at least 60% identity, at least 65% identity , at least 70% identity, at least 75% identity, at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least at least 98% identity with the following nucleotide sequence: GTG AGT TCC TAT TAC TCC GGT AGT TTT TTC CT TAC (SEQ ID NO: 9).
- the identity percentages of the sequences encoding the different CDRs in a heavy chain variable region are independent of one another.
- the sequence coding for CDR2H may have at least 75% with the nucleotide sequence SEQ ID NO: 7, while the sequence coding for CDR3H may have at least 65% identity with the nucleotide sequence (SEQ ID NO: 9 ).
- SEQ ID NO: 9 the sequence coding for CDR3H may have at least 65% identity with the nucleotide sequence.
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a heavy chain variable region and comprising:
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a heavy chain variable region whose nucleotide sequence has at least 60% identity with the following sequence:
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a heavy chain variable region whose nucleotide sequence has at least 65% identity, at least 70% identity, at least 75% identity. , at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, at least 98% identity with the sequence SEQ ID NO: 13.
- the polynucleotide according to the present invention comprises at least one nucleotide sequence encoding a heavy chain variable region whose nucleotide sequence corresponds to the sequence SEQ ID NO: 13.
- percentage identity between two amino acid sequences (or between two nucleotide sequences) is meant, in the context of the present invention, a percentage of identical amino acid residues (or nucleotides) between the two compared sequences, this percentage being obtained after implementation of the best alignment (optimum alignment) between the two sequences.
- Those skilled in the art know different techniques for obtaining such a percentage of identity and involving homology algorithms or computer programs such as the BLAST program.
- the percent identity is statistical and the differences between the two sequences are randomly distributed along these sequences.
- the differences between the two sequences may consist of different types of sequence modifications: deletions, substitutions or additions of amino acid residues (or nucleotides).
- the modifications implemented in the sequences result in substitutions with non-equivalent amino acids, ie amino acids having no structural homology. These modifications are likely to improve the biological properties of the antibody ie improved affinity and / or specificity, expanded recognition spectrum, increased stability, reduced immunogenicity etc.
- these modifications, insertions or deletions may target a CDR essential or not to the properties of the antibody according to the invention.
- these modifications, insertions or deletions may also target an RF region, knowing that such regions, within the variable domains of the antibodies, may, depending on the antibodies, also play a role in the expression of the properties. of the antibody according to the invention.
- the present invention also relates to a cloning and / or expression vector containing at least one polynucleotide according to the present invention.
- a cloning and / or expression vector containing at least one polynucleotide according to the present invention.
- Such vector is especially useful for transforming a host organism and expressing in the latter an antibody according to the present invention.
- the vector according to the present invention further comprises one (or more) element (s) which allows (s) the expression of the polynucleotide according to the present invention and / or the secretion of the product resulting from the translation of the polynucleotide according to the present invention.
- element (s) which allows (s) the expression of the polynucleotide according to the present invention and / or the secretion of the product resulting from the translation of the polynucleotide according to the present invention.
- elements mention may be made of a constitutive or inducible promoter, a transcription initiation signal or a transcription termination signal, a translation initiation sequence or an end of translation signal.
- the vector according to the present invention comprises, operably linked, a promoter, a polynucleotide of the invention and a terminator element.
- operably linked together according to the invention, elements linked together so that the operation of one of the elements is affected by that of another.
- a promoter is operably linked to a coding sequence when it is able to affect the expression of the latter.
- the regulatory elements for the transcription, translation and maturation of the peptides that the vector can comprise are known to those skilled in the art and the latter is capable of selecting them according to the host organism in which the expression or cloning must be done.
- the vector according to the present invention is advantageously chosen from a plasmid, a cosmid, a bacteriophage and a virus such as a baculovirus.
- the vector of the invention is a vector with autonomous replication comprising elements allowing its maintenance and its replication in the host organism as an origin of replication.
- the vector may include elements allowing its selection in the host organism such as, for example, an antibiotic resistance gene or a selection gene which ensures complementation with the respective gene deleted at the level of the genome of the host organism.
- Such cloning and / or expression vectors are well known to those skilled in the art and widely described in the literature.
- the invention also relates to a host organism transformed with or comprising a polynucleotide according to the present invention or a vector according to the present invention.
- host organism is meant any isolated, uni- or multicellular, lower or higher organism in which a polynucleotide of the invention is introduced for the production of an antibody according to the present invention.
- this method can be electroporation, lipofection, a biological transformation of a plant using Agrobacterium tumefasciens, a thermal shock or a chemical process.
- the host organism is a microorganism such as a yeast, a bacterium or a fungus.
- a microorganism such as a yeast, a bacterium or a fungus.
- the transformation of such microorganisms makes it possible to produce the antibody of the invention on a semi-industrial or industrial scale.
- the host organism is an animal cell such as a mammalian cell, a plant cell, an insect cell, an animal with the exception of a human, or a plant.
- a method for producing an antibody according to the present invention comprises the steps of:
- the antibody according to the present invention is also modifiable in order to a) generate an antibody labeled with a radioactive isotope, a pro-drug, an enzyme or a toxin, and b) modify the binding specificity and / or affinity, and / or the stability, and / or immunogenicity of said antibody targeting cells that overexpress ETA-R, including cancer cells such as glioblastoma etc.
- the antibody according to the present invention is also modifiable in order to couple it chemically or genetically to a peptide molecule; a protein molecule; a nucleic molecule such as DNA, RNA, RNAi, aptamer, PNA or LNA; a lipid molecule; a carbohydrate molecule or a chemical molecule.
- the present invention therefore relates to a compound comprising an antibody according to the present invention conjugated to an element selected from the group consisting of a cytotoxic group, an easily detectable group or an effector group.
- cytotoxic group is meant a directly or indirectly toxic group for the cells targeted by the antibody according to the present invention.
- directly cytotoxic is meant a group which is in itself cytotoxic.
- indirectly cytotoxic is meant a group which, although not cytotoxic in itself, can induce cytotoxicity, for example by its action on another molecule or by an additional action on it.
- the cytotoxic moiety is a cytotoxic chemotherapeutic agent.
- cytotoxic chemotherapeutic agents that can be used in the context of the present invention.
- the activity of these agents can be increased under irradiation.
- alkylating agents such as mechlorethamine or chlorambucil; methotrexate; 5-fluorouracil; Vinblastine; gemcitabine; fludarabine; nicotinamide; doxorubicin; mitomycin; L-asparaginase; cisplatin; taxol and its analogues / derivatives.
- the cytotoxic moiety is a (poly) peptide cytotoxic such as ricin, abrin, Pseudomonas exotoxin, TNF and interleukin-2.
- the cytotoxic moiety is a cytotoxic chemotherapeutic agent indirectly.
- an agent also called pro-drug is not or little cytotoxic as such but is able to give, especially following an enzymatic reaction or irradiation, a substance cytotoxic (or drug) especially as defined in the 1st form of implementation.
- cytotoxic or drug especially as defined in the 1st form of implementation.
- the cytotoxic moiety is a (poly) peptide indirectly cytotoxic.
- the term "indirectly cytotoxic poly (peptide) group” is intended to mean a polypeptide which has an enzymatic activity and can convert a relatively non-toxic pro-drug, especially as defined in the third embodiment, into a cytotoxic substance, in particular as defined in US Pat. the era of the form of implementation.
- a peptidase such as a carboxypeptidase, an aminopeptidase or an endopeptidase; phosphatase; sulfatase; an amidase; a kinase; glycosidase; deaminase; a reductase and an oxidase.
- the cytotoxic moiety is a nucleic acid molecule which is directly or indirectly cytotoxic such as an antisense oligonucleotide or an aptamer.
- the cytotoxic group is a radioactive isotope such as iodine-131, yttrium-90, lutetium-177, copper-67, lead-212.
- this conjugation may consist in producing the compound according to the invention in the form of a fusion compound by genetic recombination techniques, in which a polynucleotide comprises respective regions encoding the antibody according to the present invention and the cytotoxic group, adjacent to each other, juxtaposed or separated by a region encoding a peptide linker that does not destroy the desired properties of the final hybrid compound.
- the only constraint to be respected in the context of this conjugation is that the conjugated antibody retains its binding specificity for ETA-R, a property associated with those cytotoxic group.
- asily detectable group is meant, in the context of the present invention, a group that can be detected by implementing a suitable noninvasive appropriate detection technique such as microscopy, scintigraphy and imaging. magnetic resonance (MRI).
- MRI magnetic resonance
- a compound according to the invention comprising such an easily detectable group is particularly suited to the field of imaging and diagnosis. In particular, it makes it possible to identify and locate sites where ETA-R is overexpressed because of the ETA-R binding specificity of the antibody present in this compound.
- the easily detectable group may be an enzyme or a molecule capable of generating a detectable and possibly quantifiable signal under particular conditions, such as when placing a suitable substrate.
- an enzyme or a molecule capable of generating a detectable and possibly quantifiable signal under particular conditions, such as when placing a suitable substrate.
- biotin digoxygenine, 5-bromodeoxyuridine, alkaline phosphatase, peroxidase, acetylcholine esterase (AChE), glucose amylase and lysozyme.
- the readily detectable moiety may be a fluorescent, bioluminescent or chimiofluorescent such as fluorescein and its derivatives; rhodamine and its derivatives; GFP (for "Green Fluorescent Protein") and its derivatives; umbelliferone and its derivatives; luminol; luciferase and luciferin.
- fluorescent, bioluminescent or chimiofluorescent such as fluorescein and its derivatives; rhodamine and its derivatives; GFP (for "Green Fluorescent Protein") and its derivatives; umbelliferone and its derivatives; luminol; luciferase and luciferin.
- the easily detectable moiety may be a radioactive label or isotope such as iodine-123, iodine-125, iodine-126, iodine-133, indium-111, indium-113m, bromine-77, gallium-67, gallium-68, ruthenium-95, ruthenium-97, technetium-99m, fluorine-18, carbon-13, nitrogen-15, oxygen-17, scandium-47, tellurium-122m, thulium-165 and yttrium-199.
- some radioactive atoms used as easily detectable groups can also constitute cytotoxic groups due to the amount of radioactivity they can deliver.
- conjugation of the antibody according to the invention with the cytotoxic groups applies mutatis mutandis to the conjugation of the antibody according to the invention with the easily detectable groups.
- the conjugation of the antibody according to the invention with the easily detectable groups can also be carried out in relation to nano-objects, in order to densify their concentration, and thus to improve the emitted signal, the contrast or the toxicity. .
- this easily detectable group is a radioactive marker
- the latter can be introduced into the peptide sequence of the antibody according to the invention. This introduction can take place during the synthesis of the antibody using one or more labeled amino acids. Alternatively, this introduction can take place following this synthesis by fixing the radioactive label on residues of the peptide sequence of the synthesized antibody. For example, yttrium-90 can be attached via a lysine residue.
- the radioactive marker may be indirectly attached to the antibody by known means. For example, EDTA or another chelating agent may be attached to the antibody of the invention and used to bind indium-111.
- the present invention relates to the use of a compound comprising an antibody and an easily detectable moiety as a highly effective diagnostic, prognostic and in vivo monitoring tool in medical imaging.
- the antibody format is chosen to generate the best signal-to-noise ratio and the best pharmacokinetics.
- the present invention relates to a method for detecting and quantifying in vivo or in vitro expression or overexpression of subtype A endothelin receptors, comprising: ai) contacting a biological sample with a compound according to the present invention;
- Such a method can be implemented to detect, diagnose, predict or follow a state in which the subtype A endothelin receptors is overexpressed and in particular to detect, diagnose, prognostic or follow a cancerous state (presence, size and evolution cancerous tumors).
- a method for diagnosing a cancer such as glioblastoma, the latter comprises the steps of:
- step (bi ') detecting the signal emitted by the easily detectable group and ci') determining the presence or absence of a cancer in said subject on the basis of the signal detected in step (bi ') possibly compared to a control signal .
- control signal is meant, in the context of the present invention, a signal or an average value of signals obtained for a healthy subject or, conversely, a signal or a mean value of signals obtained (e) for a cancerous subject.
- the diagnostic method according to the invention is a process carried out in vitro for which the biological sample such as a biopsy has been taken from the subject before the implementation of step (a). ).
- this method may correspond to an in vivo imaging method in which an effective amount of the compound according to the invention has been previously administered to the subject.
- effective amount is meant a quantity of compound sufficient for the imaging of cancers. This amount varies depending on the mode of administration, the formulation administered, the excipient and the cancer to be diagnosed. However, determining this effective amount is routine work for those skilled in the art.
- effector group is meant, in the context of the present invention, a group capable of specifically recognizing a cancer marker, or which allows the recruitment of (i) an effector cell of the immune system, ie NK cells, cytotoxic T cells, macrophages or (ii) the complement system.
- group capable of specifically recognizing a cancer marker is meant, in the context of the present invention, a ligand of a cancer marker; an antibody identical to or different from an antibody according to the present invention; a protein; a peptide; or a nucleic molecule such as DNA, RNA, RNAi, aptamer, PNA or LNA.
- cancer marker both an ETA-R and another membrane marker are contemplated.
- the effector group recognizes a cancer marker, identical to or different from ETA-R, expressed on the surface of the cancer cells, thus ensuring a better specificity of recognition and therefore an increased targeting of the cancer cells.
- the effector moiety has recognition specificity for a marker specifically present on the surface of effector cells of the immune system, ie, NK cells, macrophages, or cytotoxic T cells.
- a marker specifically present on the surface of effector cells of the immune system ie, NK cells, macrophages, or cytotoxic T cells.
- Such recruitment provides targeted lysis of the cancer cells recognized by the antibody of the present invention.
- the effector group has recognition specificity for the complement system and, in particular, for the Cl protein or its truncated form Clq, which initiates the cascade of molecular events that lead to death. of the targeted cell.
- Such recruitment provides targeted lysis of the cancer cells recognized by the antibody of the present invention.
- the effector group has a recognition specificity for the complement system and, in particular, the protein C3 or its truncated form C3b, thus ensuring the recruitment of effector cells of the immune system, cells which induce the death of the targeted cell.
- Such recruitment provides targeted lysis of the cancer cells recognized by the antibody of the present invention.
- the present invention relates to an antibody according to the present invention, a polynucleotide according to the present invention or a compound according to the present invention for use as a medicament.
- the present invention relates to a pharmaceutical composition
- a pharmaceutical composition comprising, as active ingredient, an antibody according to the present invention, or a polynucleotide according to the present invention or a compound according to the present invention and a pharmaceutically acceptable vehicle.
- pharmaceutically acceptable carrier any substance that is added to an antibody, a polynucleotide or a compound according to the present invention to promote its transport, avoid its substantial degradation in said composition and / or increase its half -life.
- a pharmaceutically acceptable vehicle is sterile and pyrogen-free. It is chosen according to the type of application of the pharmaceutical composition of the invention and in particular according to its mode of administration.
- the pharmaceutical composition according to the invention consists of at least one antibody, or a polynucleotide or a compound according to the present invention in free form or in the form of an addition salt with a pharmaceutically acceptable acid, in the state pure or in the form of a composition in which it is associated with any other pharmaceutically compatible product.
- the pharmaceutical compositions according to the invention can be used systemically; parenterally, for example intravenous, intraarterial, intraperitoneal, intrathecal, intraventricular, intrasternal, intracranial, intramuscular or subcutaneous; topically; oral; rectally; intranasally or by inhalation.
- compositions for oral administration it is possible to use tablets, pills, powders, etc., in which the antibody, the polynucleotide or the compound according to the invention are mixed with one or more inert diluents conventionally used. and possibly other substances such as, for example, a lubricant, a colorant, a coating, etc.
- compositions for oral or ocular administration suspensions, solutions, emulsions, syrups can be used.
- the sterile compositions for parenteral administration may be aqueous solutions or not, suspensions or emulsions.
- a solvent or vehicle water, propylene glycol, vegetable oils or other suitable organic solvents may be employed.
- These compositions may also contain adjuvants, such as wetting agents, isotonic agents, emulsifiers, etc.
- compositions for topical administration may be, for example, creams, lotions, mouthwashes, nasal or eye drops or aerosol.
- the daily dose level of the antibody, polynucleotide or compound according to the present invention is usually 1 to 1000 mg per adult (i.e., about 0.015 to 15 mg / kg), administered in single or split doses. These doses are given for illustrative purposes only. In any case, the doctor will be able to determine the actual dose that is best for a given individual patient, and this varies according to the patient's age, weight and response.
- the present invention relates to an antibody according to the present invention, a polynucleotide according to the present invention, a compound according to the present invention or a pharmaceutical composition according to the present invention for use in the treatment and / or prevention of a disorder or disorder.
- pathology involving a dysfunction, directly or in combination with another physiological pathway, of the axis comprising an endothelin and at least one of its receptors such as, in particular, the subtype A endothelin receptors.
- such a disorder or such a pathology is a cancer.
- cancers there may be mentioned melanoma, colorectal cancer, colon cancer, Kaposi's sarcoma, glioblastoma, ovarian cancer and bladder cancer.
- this disorder is a glioblastoma.
- the present invention relates to a method for treating and / or preventing a disorder or pathology involving a dysfunction, direct or in combination with another physiological pathway, of the axis comprising an endothelin and at least one of its receptors such as, in particular, endothelin receptor subtype A in a patient suffering or likely to suffer from such a disorder or pathology.
- This method comprises administering to said patient an effective amount of an antibody according to the present invention, a polynucleotide according to the present invention, a compound according to the present invention or a pharmaceutical composition according to the present invention.
- the present invention relates to the use of an antibody according to the present invention or a compound according to the present invention as a research tool particularly suitable for the study of signaling pathways associated with the endothelin axis / receptors. endothelin, as well as to progress in understanding the structural and functional characteristics of this family of receptors.
- Figure 1 shows the binding curves of Rendomab-A63 on CHO cells overexpressing ETA-R (CHO-ETAR) or CHO not expressing ETA-R (CHO-WT) in the presence or absence of endothelin 1 (ET1) .
- Figure 2 shows the binding curves of Rendomab-A63 on glioblastoma stem cells, GLI-7, overexpressing ETA-R.
- Figure 3 shows the difference in level of expression of the EDNRA transcript encoding the endothelin A receptor in patients' glioblastoma cells (denoted GBM) compared to non-tumor neuronal cells (noted Non-tumor).
- FIG. 4 shows immunofluorescence results on glioblastoma GLI-7 stem cells, in the presence of 1 mM of ET1-FAM (FIG. 4A), in the presence 30 nM of Rendomab-A63 (RA63) ( Figure 4B) or in the presence of 30 nM of a control antibody (NC) ( Figure 4C).
- the nuclei are stained with DRAQ 5.
- FIG. 5 shows the binding curve of the Rendomab Axx antibody which does not form part of the invention, on the CHO cells transfected with the endothelin type A receptor (CHO ETAR) (continuous black line) and in the presence of 100 nM endothelin 1 (ET1) (discontinuous gray line).
- CHO ETAR endothelin type A receptor
- ET1 endothelin 1
- Figure 6 shows the immunofluorescence staining on glioblastoma GLI-7 stem cells in the presence of 30 nM Rendomab-Axx (RAxx) revealed by a secondary antibody labeled with Alexa fluor 488 (Raxx-AF488). The nuclei are stained with DRAQ.5. Both images are merged (Fusion).
- Figure 7 shows the fluorescence in vivo imaging results on a preclinical model of xenografted nude mice in orthotopic position with GLI-7 cells.
- Figure 7A shows the positive detection control of Rendomab A63- AF680 and AF750 Control.
- Figure 7B shows the detection of fluorescence in vivo in the grafted mouse and the control mouse.
- Figure 7C shows the detection of ex vivo fluorescence in the graft brain and the brain control.
- Figure 8 shows the nucleotide sequences and amino acid sequences deduced from the variable domains of the Rendomab-A63 light chain and heavy chain.
- the immunization and hybridoma screening strategy implemented in the present invention is identical to that implemented in international applications WO 2012/045776 [14] and WO 2017/220739 [15].
- Rendomab-A63 After purification of Rendomab-A63 on Protein A - PropSep high capacity (Millipore), a characterization of its biochemical properties was carried out. Heavy and light chain isotyping of Rendomab-A63 was performed using Piercell's Rapid ELISA Mouse mAb Isotyping kit. It is an immunoglobulin type G, isotype 2b for the heavy chain and kappa for the light chain. Rendomab-A63 is therefore a lgG2b / kappa type immunoglobulin.
- ETA-R in its cellular context (CHO-ETAR and Gli-7 cells) by Rendomab-A63 was established by flow cytometry and immunofluorescent cell staining.
- CHO-ETAR line CHO cells transfected stably, to allow strong expression of ETA-R and
- glioblastoma stem cell line, Gli-7 established by Dr. Jean-Philippe Hugnot from a biopsy following the exeresis of a glioblastoma in a patient.
- Quantitation of the fluorescence is done by flow cytometry on a FACSCalibur TM (BD Bioscience). A range of antibody concentrations ranging from a maximum of 1mM to a minimum of 5 ⁇ M was incubated for 2h at 4 ° C in the presence or absence of 100nM ET1 (preincubated for 30 min at 4 ° C). At 90% confluency, the cells are detached in the presence of versene and then aliquoted into tubes (300 mI / 300,000 cells) in the presence of a saturation buffer (PBS-5% SNC - 0.1% BSA) stored at 4 ° C. C.
- a saturation buffer PBS-5% SNC - 0.1% BSA
- the affinity of RA63 for ETA-R expressed at the surface of Gli 7 cells is of the order of nanomolar (15 nM).
- Glioblastoma tumor cells are known to overexpress GET-1 [20] and endothelin type A receptor (ETAR) as shown in the transcriptomic data of the public database Gliovis (http://gliovis.bioinfo.cnio.es /) shown in Figure 3. These data clearly indicate overexpression of the EDNRA transcript in patients' glioblastoma cells.
- Figure 4 shows immunofluorescence results on Gli-7 glioblastoma stem cells under the following operating conditions:
- the cores are stained with DRAQ.5 (Abcam abl08410) following the provider's protocol.
- the Gli-7 cells were incubated for 12 h at 4 ° C. with either 1 ⁇ M of ETIFAM or 30 nM final of the RA63, ie 30 nM final of the NC.
- the secondary antibody diluted 1/400, coupled to AF488 (Invitrogen-ref A10684) is added to the cells for 2 h at 4 ° C.
- AF488 Invitrogen-ref A10684
- FIG. 4A makes it possible to ascertain the presence of endothelin receptors capable of binding endothelin 1 on Gli-7 cells.
- Figure 4B shows a very strong immunolabeling of Gli-7 cells with RA63 antibody recognizing endothelin A receptor, whereas a control negative (NC) antibody, of the same isotype as RA63 (IgG2b Kappa), does not generates no signal on Gli-7 cells ( Figure 4C). All of these results make it possible to conclude that there is a strong expression of ETA-R on the surface of Gli-7 cells demonstrated by the binding of the specific RA63 antibody of ETA-R. This binding is well mediated by the variable region of the RA63 antibody as shown by the absence of signal when using the control antibody.
- Rendomab-Axx antibody directed against ETAR having an affinity nM but whose binding on the endothelin A receptor is displaced by a concentration of 100 nM ETl (FIG. 5).
- This antibody therefore has properties comparable to those of the antibodies described in patent application CA 2 971 491 [13].
- Figure 7 shows the fluorescence in vivo imaging results on a preclinical model of xenografted nude mouse in orthotopic position with Gli-7 cells.
- a quantity range of the RA-AF680 and NC-AF750 tracers were imaged on a solid support to the FMT 1500 (Perking Elmer) to demonstrate the specificity of the filters used for the fluorescence detection is i) at 680 nm where only the RA63-AF680 emits a detectable fluorescence signal or either ii) at 750 nm where only the NC-AF750 emits a detectable fluorescence signal.
- mice are imaged at 3 months post-xenograft.
- Co-injection of the tracers RA63-AF680 (14 nmol of RA63 coupled with 8 nmol of AF680) and NC-AF750 (17 nmol of control antibody coupled to 7 nmol of AF750) were injected intraperitoneally (IP). to the nude xenograft mouse and the normal nude mouse (control mouse).
- mice were imaged at FMT 1500 (Perkin Elmer). For each mouse, simultaneous acquisition at 680 nm and 750 nm was performed. A strong fluorescence at 680 nm is observed at the head of the xenografted mouse whereas on this same mouse, the tracer NC-AF750 generates no fluorescence at 750 nm. Thus, only the tracer RA63-AF680 was detected on the live xenografted mouse with the GLI-7 line. There is also no detection of tracers RA63-AF680 and NC-AF750 injected into the normal mouse.
- mice were sacrificed, their brain removed and fixed with 4% paraformaldehyde solution (4% PFA) for 1h at 4 ° C.
- the brains were imaged as before.
- strong fluorescence is observed with the tracer RA63-AF680 in the brain invaded by the tumor cells, whereas no signal is detected with the tracer NC-AF750.
- the absence of fluorescence is also seen with both tracers, RA63-AF680 and NC-AF750 in the control mouse brain.
- the RA63 antibody can be used as a tracer (RA63-AF680) to diagnose the presence of glioblastoma (Gli-7) tumor cells for imaging applications.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Urology & Nephrology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Endocrinology (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Food Science & Technology (AREA)
- Microbiology (AREA)
- Cell Biology (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Biotechnology (AREA)
- Genetics & Genomics (AREA)
- Biophysics (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Neurology (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
- Peptides Or Proteins (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Medicinal Preparation (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1851026A FR3077574B1 (fr) | 2018-02-07 | 2018-02-07 | Anticorps dirige contre le sous-type a des recepteurs aux endothelines et ses utilisations. |
| PCT/FR2019/050245 WO2019155151A2 (fr) | 2018-02-07 | 2019-02-04 | Anticorps dirigé contre le sous-type a des récepteurs aux endothélines et ses utilisations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3735428A2 true EP3735428A2 (fr) | 2020-11-11 |
Family
ID=62017513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19744751.9A Pending EP3735428A2 (fr) | 2018-02-07 | 2019-02-04 | Anticorps dirigé contre le sous-type a des récepteurs aux endothélines et ses utilisations |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12084505B2 (fr) |
| EP (1) | EP3735428A2 (fr) |
| JP (1) | JP7456930B2 (fr) |
| FR (1) | FR3077574B1 (fr) |
| WO (1) | WO2019155151A2 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024165823A2 (fr) * | 2023-02-09 | 2024-08-15 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Fragment fab mutant pour l'obtention de conjugués mono- ou bi-fonctionnalisés site-spécifiques |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4816567A (en) | 1983-04-08 | 1989-03-28 | Genentech, Inc. | Recombinant immunoglobin preparations |
| EP1996619A4 (fr) * | 2006-02-14 | 2009-11-18 | Geisinger Clinic | Récepteurs gpcr utilisés comme cibles pour l'angiogenèse |
| JP2008280266A (ja) * | 2007-05-09 | 2008-11-20 | Sekisui Chem Co Ltd | モノクローナル抗体 |
| FR2965810B1 (fr) | 2010-10-06 | 2012-12-28 | Commissariat Energie Atomique | Anticorps antagoniste du sous-type b des recepteurs aux endothelines et ses utilisations |
| CN103728454B (zh) * | 2012-10-10 | 2016-05-18 | 吴庄民 | 基于表位抗原肽的抗内皮素受体a抗体酶联免疫试剂盒及其应用 |
| CN111018987B (zh) * | 2014-12-05 | 2023-11-21 | 鸿运华宁(杭州)生物医药有限公司 | 一种能与人内皮素受体特异性结合的抗体及其应用 |
| TWI826351B (zh) * | 2016-05-31 | 2023-12-21 | 大陸商鴻運華寧(杭州)生物醫藥有限公司 | R抗體,其藥物組合物及其應用 |
| FR3053042B1 (fr) | 2016-06-24 | 2018-08-10 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Anticorps dirige contre le sous-type b des recepteurs aux endothelines et ses utilisations |
-
2018
- 2018-02-07 FR FR1851026A patent/FR3077574B1/fr active Active
-
2019
- 2019-02-04 US US16/967,763 patent/US12084505B2/en active Active
- 2019-02-04 EP EP19744751.9A patent/EP3735428A2/fr active Pending
- 2019-02-04 WO PCT/FR2019/050245 patent/WO2019155151A2/fr not_active Ceased
- 2019-02-04 JP JP2020542857A patent/JP7456930B2/ja active Active
Non-Patent Citations (1)
| Title |
|---|
| LUPP AMELIE ET AL: "Reassessment of endothelin receptor A expression in normal and neoplastic human tissues using the novel rabbit monoclonal antibody UMB-8", PEPTIDES, vol. 66, 1 April 2015 (2015-04-01), AMSTERDAM, NL, pages 19 - 25, XP093195230, ISSN: 0196-9781, DOI: 10.1016/j.peptides.2015.02.005 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7456930B2 (ja) | 2024-03-27 |
| US20220089755A1 (en) | 2022-03-24 |
| FR3077574B1 (fr) | 2022-04-01 |
| WO2019155151A3 (fr) | 2019-12-12 |
| JP2021513345A (ja) | 2021-05-27 |
| US12084505B2 (en) | 2024-09-10 |
| WO2019155151A2 (fr) | 2019-08-15 |
| FR3077574A1 (fr) | 2019-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR3053042A1 (fr) | Anticorps dirige contre le sous-type b des recepteurs aux endothelines et ses utilisations | |
| EP1806364B1 (fr) | Nouveaux anticorps anti-igf-ir et leurs applications | |
| FR2965810A1 (fr) | Anticorps antagoniste du sous-type b des recepteurs aux endothelines et ses utilisations | |
| US9139655B2 (en) | Tumor-targeting monoclonal antibodies to FZD10 and uses thereof | |
| KR20190104160A (ko) | 항 gpr20 항체 및 항 gpr20 항체-약물 콘쥬게이트 | |
| FR2873699A1 (fr) | Nouveaux anticorps anti igf ir rt leurs utilisations | |
| FR2929946A1 (fr) | Nouveaux anticorps anti-cd151 et leur utilisation pour le traitement du cancer | |
| CA2665912C (fr) | Utilisation d'un anticorps anti-cd151 pour le traitement du cancer | |
| WO2011138557A2 (fr) | Utilisation d'anticorps anti-cd71 pour la preparation d'un medicament | |
| MX2010007551A (es) | Antagonistas de la cadherina-11 y metodos para el tratamiento de trastornos inflamatorios de las articulacion. | |
| EP3438129A1 (fr) | Composition d'anticorps monoclonaux diriges contre bdca-2 | |
| FR2906533A1 (fr) | Procede de generation d'anticorps actifs contre un antigene de resistance,anticorps obtenus par ledit procede et leurs utilisations | |
| FR2909092A1 (fr) | Nouveaux anticorps anti-proliferation | |
| EP3735428A2 (fr) | Anticorps dirigé contre le sous-type a des récepteurs aux endothélines et ses utilisations | |
| FR2658197A1 (fr) | Anticorps monoclonaux restreints reconnaissant un peptide associe a un antigene du complexe majeur d'histocompatibilite - applications au diagnostic et au traitement. | |
| EP1919953A1 (fr) | Anticorps diriges contre le recepteur du ldl | |
| FR2834991A1 (fr) | Nouveaux anticorps anti-igf-ir et leurs applications | |
| FR2834900A1 (fr) | Nouvelles compositions a activite anti-igf-ir et anti-egfr et leurs applications | |
| FR2889532A1 (fr) | Anticorps diriges contre le recepteur du ldl |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20200806 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| AX | Request for extension of the european patent |
Extension state: BA ME |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: INSTITUT NATIONAL DE LA SANTE ET DE LA RECHERCHE MEDICALE Owner name: UNIVERSITE DE MONTPELLIER Owner name: UNIVERSITE PARIS CITE Owner name: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES |
|
| P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230518 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
| 17Q | First examination report despatched |
Effective date: 20240822 |
|
| RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: INSTITUT NATIONAL DE LA SANTE ET DE LA RECHERCHEMEDICALE Owner name: UNIVERSITE DE MONTPELLIER Owner name: UNIVERSITE PARIS CITE Owner name: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIESALTERNATIVES |