WO2010058097A1 - Protéine cd20 tronquée, deltacd20 - Google Patents
Protéine cd20 tronquée, deltacd20 Download PDFInfo
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- WO2010058097A1 WO2010058097A1 PCT/FR2009/001315 FR2009001315W WO2010058097A1 WO 2010058097 A1 WO2010058097 A1 WO 2010058097A1 FR 2009001315 W FR2009001315 W FR 2009001315W WO 2010058097 A1 WO2010058097 A1 WO 2010058097A1
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- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6881—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for tissue or cell typing, e.g. human leukocyte antigen [HLA] probes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
- A61P35/02—Antineoplastic agents specific for leukemia
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
- C07K14/70596—Molecules with a "CD"-designation not provided for elsewhere
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- 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
- G01N33/57505—Immunoassay; Biospecific binding assay; Materials therefor for cancer of the blood, e.g. leukaemia
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- A—HUMAN NECESSITIES
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/57—Medicinal preparations containing antigens or antibodies characterised by the type of response, e.g. Th1, Th2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61K38/00—Medicinal preparations containing peptides
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- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/112—Disease subtyping, staging or classification
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- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/158—Expression markers
Definitions
- the present invention relates in particular to a protein derived from an alternative splicing of the gene encoding CD20, the nucleic acid sequences encoding the protein according to the invention, a mutated form of the gene encoding CD20, as well as medicinal products, diagnostic tools, diagnostic methods and therapeutic methods using the protein and nucleic acid sequences of the invention.
- the CD20 protein expressed on B lymphocytes is encoded by a gene belonging to a family located on chromosome 11 in region q12. This region defines a gene cluster named MS4A (for Membrane Spanning 4 domain Subfamily A), with 12 subgroups designated MS4A1 to MS4A12. This cluster of genes, extends over 600Kb. The entire CD20 gene covers 41.17 Kb divided into 8 exons separated by 7 introns.
- the CD20 pre-messenger RNA has a size of 14.95 Kb with a 5 'untranslated sequence (5'UTR) of 416bp.
- the 3'UTR region is 2291pb followed by a polyA extension and would correspond to a regulatory sequence.
- the sequence potentially encodes a protein of 297 amino acids (AA) for a predictive molecular weight of 33.0 KDa. He was identified different splice site in the 5 'UTR region, specifically in exon 1, generating three forms of transcripts of various sizes ranging from 2.8, 2.6 and 3.4' Kb.
- transcripts encode the CD20 protein with a molecular weight of 33KD; however, by Western blot and immunoprecipitation, it has been shown the presence of 3 isoforms of 33, 34.5 and 36KD which do not correspond to spliced variants but to post-transcriptional modifications by phosphorylation.
- This protein consists of a region very hydrophobic, 4 transmembrane segments (AA 68 to 84), delimiting an extracellular domain (AA encoded by exon VI) and an intracellular domain (AA encoded by exon III, V, VII and VIII).
- CD20 protein Although it is widely used as a marker for peripheral blood B lymphocytes, in lymphocyte population characterization techniques or in the diagnosis of certain pathologies or hemopathies B, the function of the CD20 protein is still poorly known to date. However, the protein structure of the human or murine CD20 molecule is similar to other proteins such as rhodopsin, Gap junction proteins, or some adrenergic receptors, all of which are involved in signal transduction, suggesting a similar role for this protein. . The intracellular portion of this protein has many phosphorylation sequences and is associated with tyrosine kinases of the src family (Fyn, Lyn, Lck)
- CD20 protein which is the regulation of the cell cycle in the differentiation of lymphocytes.
- B LB
- CD20 activation / maturation into plasma cells.
- CD20 is expressed in large amounts on the surface of pre-B cells (absent on pro-B), after rearrangement of genes encoding Ig heavy chains, with persistent membrane expression up to 'at the mature B terminal stage.
- CD20 is not expressed on hematopoietic stem cells, pro-B cells, and plasma cells, except for a small subset of cells, under certain pathological conditions, which may correspond to plasmoblasts.
- the CD20 ligand is not known, which also makes it difficult to determine its function.
- the expression on the surface of B lymphocytes allows the characterization of this population in flow cytometry or the use in immuno-magnetic purification techniques.
- the expression of the CD20 molecule on the majority of B cells involved in malignant diseases makes it a therapeutic target of choice for several reasons:
- the CD20 / Ac complex is not internalized Rituximab (Rx, trade name: Mabthéra TM) is a murine chimeric antibody humanized against the CD20 antigen. It is active against malignant cells having "CD20 antigen, that is to say in follicular lymphoma stage III-IV and lymphomas non- - A - Hodgkin's aggressive, diffuse large B cells, CD20 positive. It is also used, combined or not with chemotherapy, and more experimentally in other pathologies, such as certain autoimmune diseases, such as lupus or rheumatoid arthritis.
- the Fc portion of human IgH has been selected for its ability to bind complement and result in ADCC (Cytable Dependent Antibody) type of cytotoxicity, the factors influencing its efficacy are diverse: CD20 surface expression density, antibody, capture of therapeutic anti-CD20 antibody, antibody / target binding, FcgR3 receptor polymorphism.
- the present invention is based on the discovery of alternative splicing of the gene encoding CD20 leading to the expression of a truncated form of CD20.
- deltaCD20 i.e. deltaCD20 or ⁇ CD20
- ⁇ CD20 is deleted from all or part of the transmembrane portion of the native CD20 (or wtCD20) which does not allow the anchoring of deltaCD20 to the membrane of B lymphocytes.
- the present invention relates to a polypeptide that is remarkable in that it comprises an amino acid sequence substantially identical to that of SEQ ID NO: 2.
- the term “substantially identical” refers to two sequences having more than 90%, preferably 95%, even more preferably 99% and most preferably 100% homology.
- the term “polypeptide” refers to an amino acid sequence comprising or not including post-translational modifications.
- the polypeptide according to the invention is obtained by synthesis or engineering genetics, in the latter case, we speak of recombinant protein.
- the polypeptide according to the invention has an amino acid sequence substantially identical to that of SEQ ID NO: 2 and most preferably it is a polypeptide having SEQ ID sequence
- the polypeptide according to the invention differs in particular from wtCD20 (whose amino acid sequence is represented by SEQ ID NO: 4) by the fact that it can not associate with the cellular membrane.
- wtCD20 whose amino acid sequence is represented by SEQ ID NO: 4
- the present invention also relates to a nucleic acid sequence which is remarkable in that it encodes a polypeptide according to the invention.
- the nucleic acid sequence according to the invention comprises a nucleic acid sequence identical to SEQ ID NO: 1.
- the nucleic acid sequence according to the invention is identical to SEQ ID NO: 1.
- nucleic acid sequence refers in particular to DNA or RNA sequences, natural or synthetic.
- the nucleic acid sequence according to the invention is synthetic or obtained by genetic engineering. According to another preferred embodiment, it is a nucleic acid sequence totally or partially purified.
- the present invention also relates to a recombinant vector comprising a nucleic acid sequence according to the invention placed under the control of one or more elements necessary for its expression in a host cell.
- the recombinant vectors are well known to those skilled in the art, they allow in particular the production of recombinant proteins and / or the multiplication of a nucleic acid sequence.
- the recombinant vector according to the invention is chosen from the group comprising plasmids and viral vectors.
- the recombinant vector according to the invention is a viral vector.
- Viral vectors are well known to those skilled in the art and are already used clinically in humans (e.g., MVA, adenovirus, retrovirus). It is mostly a vector comprising all or part of the genome of a modified virus to integrate an exogenous sequence.
- the viral vector according to the invention is chosen from the group comprising adenoviral vectors, retroviral vectors, poxviral vectors, vectors derived from herpes viruses, vectors derived from viruses associated with adenoviruses. and vectors derived from alphaviruses.
- the present invention also relates to the viral particles comprising the recombinant vectors according to the invention.
- the recombinant vector according to the invention is associated with one or more components facilitating its introduction into a host cell.
- the components facilitating the introduction of a vector into a host cell are well known to those skilled in the art and some are commercially available. also transfection agent.
- the component facilitating the introduction of a recombinant vector according to the invention into a host cell is chosen from the group comprising cationic lipids, calcium salts, cationic polymers and polypeptides. .
- the term "element necessary for expression in a host cell” refers to nucleic acid sequences allowing the translation and translation of a nucleic acid sequence as well as the sequences of nucleic acids. nucleic acids for increasing said translations and translations. According to a preferred embodiment, the element required for expression in a host cell is selected from the group consisting of introns, polyadenylation sites and promoters.
- the term host cell refers in particular to prokaryotic and eukaryotic cells.
- Such cells include bacteria, yeasts, insect cells (e.g. sf9) and animal cells (e.g. CHO, 293, PERC6).
- the present invention also relates to a host cell comprising a recombinant vector according to the invention.
- deltaCD20 correlated with the presence of certain pathologies.
- level of expression of deltaCD20 is correlated with the evolution of these pathologies. It is more particularly the pathologies related to dysfunction of B lymphocytes (also known as hemopathies B) which represent 85 to 90% of lymphoid hemopathies. These include Follicular Lymphoma (LF), Chronic Lymphocytic Leukemia (CLL), Acute Lymphoblastic Leukemia B (ALL), Mantle Lymphoma (LM), B-cell lymphoma, Myeloma, Waldenstrom's disease (WM).
- LF Follicular Lymphoma
- CLL Chronic Lymphocytic Leukemia
- ALL Acute Lymphoblastic Leukemia B
- LM Mantle Lymphoma
- B-cell lymphoma Myeloma
- Waldenstrom's disease WM
- the present invention also relates to a method for in vitro diagnosis from a biological sample of a patient, characterized in that it comprises measuring the level of expression of a polypeptide according to the invention and / or of mRNA encoding a polypeptide according to the invention.
- biological sample refers to all fluids or tissues containing the patient's B-cells.
- the biological sample is the patient's blood or bone marrow.
- the method according to the invention can be implemented with a raw biological sample (ie as taken without having undergone modification), but also after treatment of the biological sample by all the methods deemed desirable by those skilled in the art. These treatments include lysis of erythrocytes, isolation of mononuclear cells (eg isolation on Ficoll) and / or the addition of molecules allowing the conservation of the biological sample (eg antiproteases). Techniques such as erythrocyte lysis and isolation of mononuclear cells make it possible in particular to increase the proportion of B lymphocytes relative to the other cells present in the biological sample. Thus, according to a preferred embodiment, the diagnostic method according to the invention further comprises a step for increasing the proportion of B lymphocytes relative to the other cells present in the biological sample.
- polypeptide it may be the protein before or after post-translational modifications and whole or cleaved.
- the method relates to the detection of all or part of the polypeptide, so it is possible to detect only a portion of the mRNA or polypeptide, provided that the level of expression of this part is representative of the expression of the entire molecule.
- the term "level of expression” refers to the amount of deltaCD20 expressed by the cells.
- the measurement of the level of expression can be done in a quantitative or semi-quantitative way, in fact it is not necessary to know the exact amount of deltaCD20, expressed by the cells, but simply to determine if this quantity is significantly greater than one. standard. This standard can be readily determined by those skilled in the art using a pool of healthy individuals and measuring the level of deltaCD20 expression in the cells of these individuals. If the method according to the invention reveals a level of expression of deltaCD20 in the cells of the patients higher than the normal level of expression, said patient will be capable of suffering from a dysfunction of the B lymphocytes.
- the measurement of the level of expression of the polypeptide according to the invention is the measurement of the level of expression of the mRNA encoding said polypeptide.
- Techniques for measuring the amount of mRNA specifically encoding a molecule are well known to those skilled in the art. Among these techniques, mention may be made of quantitative RT-PCR, semi-quantitative RT-PCR, northern blot and the microarrays technique. The construction and production of the probes and oligonucleotides necessary for the implementation of these techniques are within the abilities of those skilled in the art. Among these oligonucleotides, there may be mentioned more particularly those described by SEQ ID NO: 14 to SEQ ID NO: 17 which are also the subject of the present invention.
- the measurement of the level of expression of the mRNA encoding the polypeptide according to the invention is preferably carried out by quantitative RT-PCR, semi-quantitative RT-PCR, real-time quantitative RT-PCR, northern blot or by the technique of microarray chips. DNA.
- said measurement of the level of expression of a polypeptide according to the invention and / or of an mRNA encoding a polypeptide according to the invention is the measurement of the level of expression of a polypeptide according to the invention and / or an mRNA encoding a polypeptide according to the invention within the B lymphocytes.
- the measurement of the level of expression of a polypeptide according to the invention is made by an immunological method.
- immunological method refers to protein detection techniques using antibodies specific for said protein.
- antibody refers to a polypeptide comprising at least one paratope.
- Antibodies include T cell receptors, immunoglobulins, chimeric antibodies, human antibodies, humanized antibodies, monoclonal antibodies, recombinant antibodies, and antibody fragments. Among the antibody fragments, mention may be made of Fab, Fab ', F (ab) 2, F (ab') 2, Fv and scFv.
- the diagnostic method according to the invention further comprises a step where the polypeptide according to the invention is brought into contact with an antibody specific for said polypeptide.
- the immunological method is chosen from the group comprising ELISA, flow cytometry and Western blot.
- the diagnostic method according to the invention is a method for diagnosing a pathology related to a dysfunction of one or more B lymphocytes of the patient.
- the pathology related to a dysfunction of one or more B lymphocytes is chosen from the group comprising B haemopathies, follicular lymphoma (LF), chronic lymphocytic leukemia (CLL), acute lymphoblastic leukemia.
- B LAL
- Mantle Lymphoma LM
- B Lymphoma Myeloma
- Waldenstrom's Disease WM
- pre-transplantation than late (targeting memory B cells).
- diagnostic method according to the invention e.g. in non-invasive biopsy fragments or urinary samples
- our ⁇ CD20 protein targeting immunotherapy strategy are useful for predicting acute rejection and improving Rituximab treatment.
- the pathology related to dysfunction of one or more B-cells is the acute rejection of grafts.
- the diagnostic method according to the invention is a method of evaluating the efficacy of a treatment comprising the use of an anti-CD20 antibody.
- said anti-CD20 antibody is Rituximab.
- the present application also relates to a kit for implementing the diagnostic method according to the invention.
- the present invention also relates to a diagnostic kit comprising at least one antibody specific for the polypeptide according to the invention.
- the presence in deltaCD20 of at least one new epitope relative to the wild form of CD20 allows the production of deltaCD20-specific antibodies.
- Those skilled in the art are quite capable of producing said antibodies by the many methods available in the prior art. It may be mentioned in particular, the phage library screen expressing scFv.
- the present invention also relates to an antibody specific for the polypeptide according to the invention.
- the antibody according to the invention is not specific for the wild-type form of CD20 and more particularly for the polypeptide having a sequence as defined by SEQ ID. NO: 4.
- the diagnostic kit according to the invention comprises at least one oligonucleotide probe specific for the mRNA encoding a polypeptide according to the invention.
- said oligonucleotide probe comprising a sequence identical to SEQ ID NO: 14 or SEQ ID NO: 17.
- said oligonucleotide probe has a sequence identical to SEQ ID NO: 14 or SEQ ID NO: 17.
- the present invention also relates to the use of a diagnostic kit according to the invention for the detection of a pathology related to a dysfunction of one or more B lymphocytes.
- said pathology linked to a dysfunction of one or more B lymphocytes is selected from the group consisting of B haematological diseases, follicular lymphoma (LF), chronic lymphocytic leukemia (CLL), acute lymphoblastic leukemia B (ALL), mantle lymphoma (LM), B-lymphoma, Myeloma, and Waldenstrom's Disease (WM).
- said pathology related to a dysfunction of one or more B lymphocytes is the acute rejection of grafts.
- the present invention also relates to the use of a diagnostic kit according to the invention for evaluating the efficacy of a treatment comprising the use of an anti-CD20 antibody.
- said anti-CD20 antibody is Rituximab.
- the polypeptide according to the invention is an ideal target for an immunotherapy strategy (vaccination). More particularly, this immunotherapy strategy is useful in the context of pathologies associated with treatments using an anti-CD20 antibody (eg Rituximab) to prevent resistance and improve treatment. Indeed, the inventors have shown in Western blot, an increase in the signal generated by the truncated protein during resistance to rituximab, induced in vitro (line B with Rituximab selection pressure), correlated with the increase of the signal obtained in RT -PCR quantitative from mRNAs of the same populations. This means that the cells that express the most deltaCD20 escape and resist the standard treatment with Rituximab.
- an anti-CD20 antibody eg Rituximab
- the truncated protein, deltaCD20 is a potential protein target, for a cytotoxic T cell response.
- spliced mRNAs also described are an attractive target, by antisense oligonucleotide technologies or by RNA silencing (SiRNA) approaches.
- SiRNA RNA silencing
- the purpose of these last two approaches is to allow the extinction in vivo of this alternative splicing.
- the present invention also relates to a method for improving a treatment, comprising the use of an anti-CD20 antibody, comprising the use of an antisense oligonucleotide and / or of a siRNA capable of totally or partially inhibiting the expression of a polypeptide according to the invention by the cells of the patient.
- Vaccination or peptide immunotherapy is a therapeutic approach that is currently of great interest in the prevention or treatment of cancers. Its principle is based on immunization with peptides that reproduce T epitopes of tumor antigens recognized by cytotoxic T lymphocytes (CTL), which play a major role in the elimination of cancer cells expressing these antigens on their surface.
- CTL cytotoxic T lymphocytes
- CTL do not recognize protein antigens integers, but peptide fragments thereof, presented by molecules of the major histocompatibility complex 1 (MHC) expressed on the surface of various cells. These are the peptide fragments that make up the T epitopes.
- MHC major histocompatibility complex 1
- the presentation of these peptides results from a complex process, called "antigen pretreatment", which involves 3 main steps: 1 / the cytosolic degradation of antigens by a multienzyme complex called proteasome, 2 / the translocation of the peptides resulting from this degradation in the endoplasmic reticulum (ER) by TAP transporters; 3 / association of these peptides with MHC to form peptide / MHC stable complexes, which will be exported to the cell surface.
- Epitopes presented by the major complex histocompatibility class 1 I (MHC I) usually have 8-11 amino acids, and are recognized by CD8 + T cells, which represent the major component of the cytotoxic response.
- the results obtained show a role of this target protein (not expressed in healthy donor B cells) in oncogenesis as well as its involvement in resistance to anti-CD20 antibody treatment (Rituximab).
- Demonstration of the deltaCD20 protein and the induction of a cytotoxic T response against a peptide overlapping the junction area of the splice allows vaccination immunotherapy to be implemented in addition to the standard treatments (anti-CD20 antibody ( Rituximab)) pathologies related to dysfunction of B lymphocytes or acute transplant rejection.
- This vaccination can be done directly with a peptide, or via a recombinant vector encoding said peptide.
- the present invention also relates to the use of all or part of a polypeptide according to the invention, all or part of a nucleic acid sequence according to the invention or all or part of a recombinant vector according to the invention for the preparation of a medicine.
- said polypeptide comprises at least one sequence chosen from the group comprising SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ. ID NO: 11 SEQ ID NO: 12 and SEQ ID NO: 13.
- said polypeptide consists of a polypeptide having a sequence selected from the group consisting of SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO. : 10, SEQ ID NO: 11 SEQ ID NO: 12 and SEQ ID NO: 13.
- the present invention also relates to the use of a nucleic acid sequence encoding a polypeptide comprising at least one sequence selected from the group consisting of SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 SEQ ID NO: 12 and SEQ ID NO: 13 for the preparation of a drug.
- nucleic acid sequence encoding a polypeptide having a sequence consisting of a sequence selected from the group consisting of SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8 , SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 SEQ ID NO: 12 and SEQ ID NO: 13 for the preparation of a medicament.
- said polypeptide comprises at least one sequence such as SEQ ID NO: 9.
- the use according to the invention is characterized in that said polypeptide consists of a polypeptide having a sequence such as SEQ ID NO: 9.
- said medicament is for improving the efficacy of a treatment comprising the use of an anti-CD20 antibody.
- said anti-CD20 antibody is Rituximab.
- said medicament for the treatment or prevention of blood disorders B follicular lymphoma (LF), chronic lymphocytic leukemia (CLL), acute lymphoblastic leukemia B (ALL), mantle lymphoma (LM), B-cell lymphoma, Myeloma, and Waldenstrom's disease (WM).
- LF follicular lymphoma
- CLL chronic lymphocytic leukemia
- ALL acute lymphoblastic leukemia B
- LM mantle lymphoma
- B-cell lymphoma Myeloma
- Waldenstrom's disease WM
- the present invention also relates to a polypeptide having a sequence selected from the group consisting of SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, SEQ ID NO: 11 SEQ ID NO: 12 and SEQ ID NO: 13.
- Another approach may be a gene transfer coding for the antibody according to the invention, thereby redirecting T lymphocytes against this protein.
- the development of a monoclonal antibody against this protein will in parallel identify the sequences encoding the hypervariable regions (CDR3) of Ig light and heavy chains.
- the identified sequences can therefore be transfected to T cells by gene transfer; the coupling with a suicide gene may make it possible to control the anti- ⁇ CD20 T response, although it will be limited to tumor-activated T expressing this form of protein.
- the present invention also relates to the use of an antibody according to the invention or a nucleic acid sequence encoding said antibody or a vector comprising said nucleic acid sequence for the preparation of a medicament, and preferably for the preparation of a medicament for the treatment of pathologies listed in connection with dysfunction of B-lymphocytes as described in this application.
- CD20 is both a membrane marker, since it is expressed on the surface of B cells, but also and "susceptibility" gene, since it codes for the target molecule of anti-CD20 antibody treatment
- hemopathies in certain hemopathies. These 2 properties can be used in gene therapy to modify ex-vivo (e.g. retroviral) or in vivo T cells (not normally expressing CD20). This is particularly useful for modulating and controlling post-allograft bone marrow complications, which are responsible for T-lymphocytes (LT).
- the cells can be selected (eg by an immunomagnetic system) based on the expression of CD20 (not normally expressed by LT) and can be targeted in vivo by anti-CD20 (Rituximab) antibody. case of complication (graft versus host disease or Graft versus Host Disease: GvHD).
- the present invention relates to a nucleic acid sequence encoding CD20, characterized in that it does not comprise an alternative splicing site.
- said sequence comprises a sequence such as SEQ ID NO: 5 and very preferably, said sequence consists of a sequence such as SEQ ID NO: 5.
- the present invention also relates to recombinant vectors such as as defined above comprising said nucleic acid sequence.
- the present invention also relates to the viral particles comprising said vectors recombinants, said recombinant vectors associated with one or more components facilitating their introduction into a host cell as defined above as well as the host cells (as defined above) comprising said recombinant vector.
- the present invention also relates to the use of said nucleic acid sequence or said recombinant vector for the preparation of a medicament, and preferentially for the preparation of a medicament for improving the efficacy of a treatment comprising the use of an anti-CD20 antibody, and even more preferentially said anti-CD20 antibody is Rituximab.
- the present invention also relates to pharmaceutical compositions comprising the polypeptides, nucleic acid sequences, antibodies and / or oligonucleotides according to the invention and a pharmaceutically acceptable buffer.
- the electrophoresis of the PCR products revealed 2 distinct bands, one of expected size of 894bp and the other of smaller size of 393bp and identical intensity.
- the truncated protein has a 131 amino acid sequence for a predicted molecular weight of 15 kD and includes the intracytoplasmic C-terminal domain, a small portion of the first transmembrane domain, and the end of the intracytoplasmic N-terminal domain.
- the potential truncated protein is not anchored to the membrane by lack of expression of the 4 transmembrane segments, as we have been able to demonstrate by confocal microscopy imaging, by transfection of cell lines with a vector expressing a fusion protein wtCD20 / GFP or ⁇ CD20 / GFP.
- the wtCD20 ⁇ / GFP or CD20 / GFP protein was expressed in 293T eukaryotic cells after transfection with a topo pcDNA3.1 CT expression vector (inVitrogen).
- the GFP protein is cloned in the reading frame of the CD20 sequence ( ⁇ or WT).
- the revelation of the GFP protein was carried out by direct excitation (green color) and the wtCD20 protein by an antiCD20 antibody coupled to TIRTC (red color).
- the labeling is cytoplasmic in the cells transfected with the truncated form of CD20 whereas there is an essentially membrane-based colocalization of the green and red marks corresponding to the GFP and wtCD20.
- ⁇ CD20 diagnostic and / or prognostic molecular biomarker for blood disorders B or complication (Acute rejection, lymphomas) post kidney allograft
- vs. ⁇ CD20 Residual disease marker (MRD)
- L 1 ⁇ CD20a immunogenicity of peptides was evaluated by generating CTLs in transgenic mice HLA-A2 / DR1 and Knock-Out (KO) for H-2 class I and II.
- mice (4 per group) are immunized with pools of 2 or 3 peptides (2 injections at the base of the tail at 8 days apart) with: 50 ⁇ g of each peptide, 100 ⁇ g of peptide helper (20-mer peptide from of CMV-specific pp65) all co-emulsified with Freud's incomplete adjuvant.
- mice Seven days after the second immunization, the spleens of the mice are removed and the splenocytes are re-stimulated in vitro with 4 ⁇ g / ml of each peptide separately. On day 5 of culture, the responding populations are tested for specific cytotoxicity. Cells, whose cytotoxicity has been shown to be conclusive, are restimulated in vitro at weekly intervals to obtain specific CTLs.
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- Urology & Nephrology (AREA)
- Genetics & Genomics (AREA)
- Biophysics (AREA)
- Biotechnology (AREA)
- Microbiology (AREA)
- Physics & Mathematics (AREA)
- Pharmacology & Pharmacy (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Animal Behavior & Ethology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Wood Science & Technology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Gastroenterology & Hepatology (AREA)
- Toxicology (AREA)
- Food Science & Technology (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- General Engineering & Computer Science (AREA)
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- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
Abstract
Description
Claims
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BRPI0916038A BRPI0916038A2 (pt) | 2008-11-18 | 2009-11-17 | proteína cd20 truncada, delta cd20 |
| EP09793553.0A EP2358751B1 (fr) | 2008-11-18 | 2009-11-17 | Protéine cd20 tronquée, deltacd20 |
| US13/129,509 US8759503B2 (en) | 2008-11-18 | 2009-11-17 | Truncated CD20 protein, deltaCD20 |
| CA2743945A CA2743945C (fr) | 2008-11-18 | 2009-11-17 | Proteine cd20 tronquee, deltacd20 |
| HK12104996.2A HK1164345B (en) | 2008-11-18 | 2009-11-17 | Truncated cd20 protein, deltacd20 |
| ES09793553.0T ES2585400T3 (es) | 2008-11-18 | 2009-11-17 | Proteína CD20 truncada, delta CD20 |
| CN200980152802.1A CN102257002B (zh) | 2008-11-18 | 2009-11-17 | 截短CD20蛋白质,DeltaCD20 |
| US14/303,999 US9388468B2 (en) | 2008-11-18 | 2014-06-13 | Truncated CD20 protein, deltaCD20 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0806444A FR2938542B1 (fr) | 2008-11-18 | 2008-11-18 | Proteine cd20 tronquee, deltacd20 |
| FR08/06444 | 2008-11-18 |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US13/129,509 A-371-Of-International US8759503B2 (en) | 2008-11-18 | 2009-11-17 | Truncated CD20 protein, deltaCD20 |
| US14/303,999 Division US9388468B2 (en) | 2008-11-18 | 2014-06-13 | Truncated CD20 protein, deltaCD20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010058097A1 true WO2010058097A1 (fr) | 2010-05-27 |
Family
ID=40707693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2009/001315 Ceased WO2010058097A1 (fr) | 2008-11-18 | 2009-11-17 | Protéine cd20 tronquée, deltacd20 |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US8759503B2 (fr) |
| EP (1) | EP2358751B1 (fr) |
| CN (1) | CN102257002B (fr) |
| BR (1) | BRPI0916038A2 (fr) |
| CA (2) | CA3028282A1 (fr) |
| ES (1) | ES2585400T3 (fr) |
| FR (1) | FR2938542B1 (fr) |
| WO (1) | WO2010058097A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3497243A4 (fr) | 2016-08-10 | 2020-04-01 | Aurelius Biotherapeutics, LLC | Compositions de thérapie cellulaire et leurs procédés d'utilisation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ530700A (en) * | 2001-06-21 | 2009-02-28 | Altus Pharmaceuticals Inc | Spherical protein particles and methods of making and using them |
-
2008
- 2008-11-18 FR FR0806444A patent/FR2938542B1/fr not_active Expired - Fee Related
-
2009
- 2009-11-17 WO PCT/FR2009/001315 patent/WO2010058097A1/fr not_active Ceased
- 2009-11-17 BR BRPI0916038A patent/BRPI0916038A2/pt not_active IP Right Cessation
- 2009-11-17 CA CA3028282A patent/CA3028282A1/fr not_active Abandoned
- 2009-11-17 ES ES09793553.0T patent/ES2585400T3/es active Active
- 2009-11-17 CN CN200980152802.1A patent/CN102257002B/zh not_active Expired - Fee Related
- 2009-11-17 CA CA2743945A patent/CA2743945C/fr not_active Expired - Fee Related
- 2009-11-17 US US13/129,509 patent/US8759503B2/en not_active Expired - Fee Related
- 2009-11-17 EP EP09793553.0A patent/EP2358751B1/fr not_active Not-in-force
-
2014
- 2014-06-13 US US14/303,999 patent/US9388468B2/en not_active Expired - Fee Related
Non-Patent Citations (7)
| Title |
|---|
| BLOOD, vol. 112, no. 11, 16 November 2008 (2008-11-16), 50TH ANNUAL MEETING OF THE AMERICAN- SOCIETY-OF-HEMATOLOGY; SAN FRANCISCO, CA, USA; DECEMBER 06 -09, 2008, pages 526, XP002570094, ISSN: 0006-4971 * |
| CRAGG M S ET AL: "The biology of CD20 and its potential as a target for mAb therapy", CURRENT DIRECTIONS IN AUTOIMMUNITY, KARGER, BASEL, CH, 1 January 2005 (2005-01-01), pages 140 - 174, XP008087727, ISSN: 1422-2132 * |
| DATABASE BIOSIS [online] BIOSCIENCES INFORMATION SERVICE, PHILADELPHIA, PA, US; November 2008 (2008-11-01), DESCHAMPS MARINA ET AL: "A New Human CD20 Spliced mRNA as a Potential Molecular Marker for the Follow-up of B-Cell Malignancies.", XP002570093, Database accession no. PREV200900258179 * |
| DATABASE EMBL [online] 24 July 2008 (2008-07-24), "Homo sapiens cDNA FLJ51650 complete cds, moderately similar to B-lymphocyte antigen CD20.", XP002531748, retrieved from EBI accession no. EMBL:AK300025 Database accession no. AK300025 * |
| EINFELD D A ET AL: "Molecular cloning of the human B cell CD20 receptor predicts a hydrophobic protein with multiple transmembrane domains", EMBO JOURNAL, OXFORD UNIVERSITY PRESS, SURREY, GB, vol. 7, no. 3, 1 January 1988 (1988-01-01), pages 711 - 717, XP002997280, ISSN: 0261-4189 * |
| LIANG Y ET AL: "STRUCTURAL ORGANIZATION OF THE HUMAN MS4A GENE CLUSTER ON CHROMOSOME 11q12", IMMUNOGENETICS, SPRINGER VERLAG, BERLIN, DE, vol. 53, no. 5, 1 July 2001 (2001-07-01), pages 357 - 368, XP009053461, ISSN: 0093-7711 * |
| STAMENKOVIC I ET AL: "ANALYSIS OF TWO CDNA CLONES ENCODING THE B LYMPHOCYTE ANTIGEN CD20 (B1, BP35), A TYPE III INTEGRAL MEMBRANE PROTEIN", THE JOURNAL OF EXPERIMENTAL MEDICINE, ROCKEFELLER UNIVERSITY PRESS, UNITED STATES, vol. 167, no. 6, 1 June 1988 (1988-06-01), pages 1975 - 1980, XP009065525, ISSN: 0022-1007 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2743945A1 (fr) | 2010-05-27 |
| US8759503B2 (en) | 2014-06-24 |
| FR2938542A1 (fr) | 2010-05-21 |
| HK1164345A1 (en) | 2012-09-21 |
| BRPI0916038A2 (pt) | 2015-11-10 |
| US9388468B2 (en) | 2016-07-12 |
| CA2743945C (fr) | 2019-02-05 |
| FR2938542B1 (fr) | 2013-06-14 |
| CN102257002B (zh) | 2015-04-15 |
| EP2358751A1 (fr) | 2011-08-24 |
| ES2585400T3 (es) | 2016-10-05 |
| CN102257002A (zh) | 2011-11-23 |
| US20140316125A1 (en) | 2014-10-23 |
| EP2358751B1 (fr) | 2016-05-11 |
| US20120129167A1 (en) | 2012-05-24 |
| CA3028282A1 (fr) | 2010-05-27 |
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