WO1996008564A1 - Anticorps humanise dirige contre la chaine beta 1 des integrines - Google Patents
Anticorps humanise dirige contre la chaine beta 1 des integrines Download PDFInfo
- Publication number
- WO1996008564A1 WO1996008564A1 PCT/FR1995/001167 FR9501167W WO9608564A1 WO 1996008564 A1 WO1996008564 A1 WO 1996008564A1 FR 9501167 W FR9501167 W FR 9501167W WO 9608564 A1 WO9608564 A1 WO 9608564A1
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- WIPO (PCT)
- Prior art keywords
- antibody
- baculovirus
- sequence
- region
- promoter
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
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- C07K16/2839—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the integrin superfamily
- C07K16/2842—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the integrin superfamily against integrin beta1-subunit-containing molecules, e.g. CD29, CD49
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
- C12N15/86—Viral vectors
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2710/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA dsDNA viruses
- C12N2710/00011—Details
- C12N2710/14011—Baculoviridae
- C12N2710/14111—Nucleopolyhedrovirus, e.g. autographa californica nucleopolyhedrovirus
- C12N2710/14141—Use of virus, viral particle or viral elements as a vector
- C12N2710/14143—Use of virus, viral particle or viral elements as a vector viral genome or elements thereof as genetic vector
Definitions
- the present invention relates to obtaining, in insect cells, a humanized recombinant monoclonal antibody.
- the monoclonal antibody K20 is a murine antibody which recognizes the ⁇ 1 (CD29) subunit of integrins.
- K20 can inhibit the activation and proliferation of peripheral T lymphocytes induced by an anti-CD3 antibody [GROUX et al., Nature, 339, 152-154 (1989); TICCHIONI et al., J. Immunol. , 151, 119-127 (1993)]. It could therefore be considered using this antibody as part of immunosuppressive therapy.
- humanized antibodies the sequences of the variable parts of which are not directly involved in the recognition of the antigen are replaced by sequences of human origin.
- the humanization of a non-human antibody therefore involves determining with the greatest precision possible what are the amino acid residues of the non-human antibody which are involved in the recognition of the antigen (and which must be preserved in the humanized antibody), and which ones can, on the contrary, be replaced to reproduce the sequences of a human antibody, without affecting or affecting as little as possible, the recognition of the antigen.
- CDR region determining the complementarity
- the aim of the present invention is to humanize the murine antibody K20, and to express the humanized antibody thus obtained in an appropriate vector / host system.
- the amino acid sequence of the VJJ and V L variable regions of this antibody was first determined, which makes it possible to locate the CDRs.
- the humanization of an antibody is carried out by grafting its CDRs in place of the CDRs of a human antibody.
- the inventors have had the idea of determining in addition, from the sequence of the variable regions of K20, the type of canonical structure of the hypervariable loops L1, L2, L3, H1 and H2.
- the canonical structures which have been observed for most of the hypervariable loops (with the exception of the H3 loop), and which are conserved between different species, are determined by a small number of key residues from the FR regions and the CDRs: different types of canonical structures were defined, according to the size of the loop, and the nature of amino acid residues it comprises [CHOTIA and LESK, J. Mol.
- the inventors then selected human V H and V L regions whose amino acid sequence has a high homology (preferably between 74 and 95% homology) with the sequence of the Vfj and VL regions of the murine antibody K20, and whose hypervariable loops L1, L2, L3, Hl and H2 have the same type of canonical structure as the corresponding hypervariable loops of said murine antibody.
- the inventors then replaced the CDRs with the corresponding CDRs of the murine antibody K20, in order to obtain the VH and VL regions of the humanized antibody.
- the process described above can be generalized to the humanization of the variable regions of any monoclonal antibody of non-human origin, in particular of murine origin.
- the subject of the present invention is a method for humanizing the variable region Vy and / or the variable region V j _, of a non-human immunoglobulin, which method is characterized in that it comprises at least the following steps :
- the process according to the invention can be completed by the point mutation (replacement, addition or deletion of a codon) of one or more oligonucleotide sequences coding for one or more amino acids located in the FRs of the VJJ or V L region. .
- Such a mutation can for example be carried out in the case where the amino acid sequence of the V H region or of the human V L region which has been selected for its homology with the non-human VJJ or VL region, present, at a determined position, an "unusual" amino acid for the variability subgroup to which it belongs. It may then be appropriate to replace this amino acid with a more representative amino acid. In general, we will try to get as close as possible to the consensus sequences of the FRs of the most homologous human subgroup, in order to further reduce the immunogenicity of the humanized antibody.
- the present invention also relates to a DNA fragment, coding for the variable region V H or for the variable region VL of a humanized antibody, and characterized in that it is capable of being obtained by the method according to the invention, as defined above.
- a DNA fragment coding for the V H variable region or for the VL variable region of a humanized antibody according to the invention can then be fused with a DNA fragment coding for the constant region of an H or L chain. human, in order to express the complete H and L chains obtained in this way.
- said humanized antibody is obtained from the murine antibody K20.
- a humanized antibody obtained by the process according to the invention will be designated by the abbreviation Hu-Ac, and more particularly, the humanized antibody derived from the antibody K20, by the abbreviation Hu-K20.
- the present invention relates to a DNA fragment, characterized in that it is chosen from the group consisting of:
- a sequence coding for the variable domain of the light chain of the Hu-Ac antibody fused to a sequence coding for the constant domain of the light chain of a human immunoglobulin; or - a sequence coding for the variable domain of the heavy chain of the Hu-Ac antibody, fused to a sequence coding for the constant domain of the heavy chain of a human immunoglobulin.
- a humanized antibody in accordance with the invention, use will preferably be made of an expression system which has also been developed by the inventors, which uses an expression vector derived from a baculovirus, and makes it possible to produce both the heavy chain (H) and the light chain (L) of a given antibody in an insect cell.
- the present invention also relates to an expression cassette comprising a recombinant DNA sequence constituted by a sequence coding for the variable region of the light chain of the Hu-Ac antibody fused to a sequence coding for the constant domain of the light chain of a human immunoglobulin; or by a sequence coding for the variable region of the heavy chain of the Hu-Ac antibody fused to a sequence coding for the constant domain of the light chain of a human immunoglobulin, which recombinant DNA sequence is placed under transcriptional control. an appropriate promoter.
- said promoter is a baculovirus promoter.
- baculovirus promoters which can be used for the implementation of the present invention, mention will be made of polyhedrin and P10 baculovirus promoters AcMNPV or S1MNPV, or derivatives of baculovirus promoters, constituted by synthetic promoters or recombinants, obtained from a baculovirus promoter, and functional in insect cells, such as for example that described by WANG et al, [Gene, 100, 131-137, (1991)].
- An expression cassette according to this embodiment comprises for example.
- baculovirus promoter as defined above; a sequence coding for a secretory signal peptide
- sequences coding for signal peptides functional in insect cells can be used for the implementation of the present Invention.
- Each of the cassettes according to the invention allows the expression, either of the light chain or of the heavy chain, of an Hu-Ac antibody, having the specificity of the parental monoclonal antibody.
- the sequence coding for the constant domain of the light chain can be chosen from the sequences coding for the constant domains of the light chains kappa (K) and lambda ( ⁇ ).
- the sequence coding for the constant domain of the heavy chain can be chosen from the sequences coding for the constant domains of the heavy chains ⁇ l, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ , ⁇ , and ⁇ . It is thus possible to obtain a recombinant antibody belonging to the immunoglobulin class (IgG1, lgG2, IgG3, IgG4, IgA, IgE, IgM) which is desired.
- the present invention also relates to recombinant vectors, carrying at least one expression cassette as defined above, - in this context, the present invention includes in particular recombinant baculoviruses allowing the expression of the antibody Hu- Ac, as well as transfer plasmids allowing the construction of said recombinant baculoviruses.
- the transfer plasmids in accordance with the invention carry an insert comprising: an expression cassette as defined above, and on either side of this cassette, baculovirus sequences homologous to those of the regions flanking the portion of the viral genome to replace which one wishes to insert said cassette.
- said baculovirus sequences are homologous to those of the regions flanking the p10O gene, or homologous to those of the regions flanking the polyhedrin gene.
- the expression cassette containing the gene coding for the light chain of the Hu-Ac antibody is flanked by the regions surrounding the polyhedrin gene in wild baculovirus, and the cassette d
- the expression carrying the gene coding for the heavy chain of the Hu-Ac antibody is flanked by the regions surrounding the PlO gene in the wild baculovirus.
- the construction of the transfer plasmids in accordance with the invention is done by inserting into a plasmid capable of replicating in a bacterial host (in general E. coli), the region of the baculovirus gene (for example plO or polyhedrin, or any other baculovirus locus) in place of which it is desired to insert the genes coding for the H or L chains of immunoglobulin.
- the coding sequence of the baculovirus gene (and possibly the promoter sequence of said gene) is replaced by the sequence coding for the immunoglobulin chain to be expressed (and optionally by the promoter sequence under whose control it is desired to express this chain.
- immunoglobulin if it is for example a "derivative" promoter).
- the transfer plasmid thus obtained therefore contains an insert comprising a heterologous sequence (sequence of a chain of the Hu-Ac antibody) flanked by baculovirus sequences.
- the inventors inserted the two cassettes on the same expression vector. They thus obtained a recombinant double baculovirus in which the coding sequence of each of the H and L chains is under the control of a strong promoter.
- a recombinant baculovirus in accordance with the invention allowing the expression of the Hu-Ac antibody, can be constructed according to the following principle:
- the insect cells are then cotransfected with the DNA of the transfer vectors thus produced and the DNA of the baculovirus. This cotransfection is carried out in two stages:
- the transfer plasmid containing the expression cassette for the light chain gene flanked by the regions surrounding the polyhedrin gene in wild baculovirus is used, with the wild baculovirus DNA AcMNPV, to cotransfect insect cells in culture.
- the light chain coding sequences of the recombinant immunoglobulin are transferred into the viral genome.
- the recombinant baculoviruses which have integrated the light chain sequence of the recombinant immunoglobulin are selected. These recombinant baculoviruses are selected according to two criteria: their inability to produce polyhedra and their capacity to express the light chain.
- the cells are cotransfected with the DNA of the recombinant baculovirus obtained at the end of the first step, and with that of the transfer plasmid containing the expression cassette. carrying the gene coding for the heavy chain of the recombinant Hu-Ac antibody flanked by the regions surrounding the PlO gene of baculovirus.
- the heavy chain gene is transferred into the viral DNA.
- the detection of the heavy chain and the light chain of immunoglobulin is carried out by ELISA.
- the subject of the present invention is a recombinant baculovirus, characterized in that it comprises at least one expression cassette, as defined above, comprising a sequence coding all or part of the H chain or a sequence coding for all or part of the L chain of the Hu-Ac antibody, which sequence is placed under transcriptional control of a strong baculovirus promoter.
- a recombinant baculovirus according to the invention, it comprises an expression cassette comprising the sequence coding for the H chain and an expression cassette comprising the sequence coding for the L chain, of the antibody Hu -Ac.
- the promoter controlling the transcription of the sequence coding for the L chain of the Hu-Ac antibody, and the promoter controlling the transcription of the sequence coding for the H chain of the Hu antibody -Ac are two different promoters.
- one of said promoters is located at the location occupied in the wild baculovirus, by the polyhedrin promoter and the other is located at the location occupied in the wild baculovirus, by the promoter of PlO.
- one of the promoters is the promoter of polyhedrin or one of its derivatives, and the other is the promoter of plO or one of its derivatives.
- the promoter controlling the transcription of the sequence encoding the light chain of the Hu-Ac antibody is the promoter of polyhedrin or one of its derivatives
- the promoter controlling the transcription of the sequence encoding the heavy chain of the Hu-Ac antibody is the promoter of PlO or one of its derivatives.
- sequence coding for the signal peptide associated with the L chain of the Hu-Ac antibody and the sequence coding for the signal peptide associated with the H chain of the Hu-Ac antibody , are two different sequences.
- a recombinant baculovirus conforming to the invention was deposited on September 9, 1994, with the C.N.C.M. (National Collection of Cultures of Microorganisms, held by the Institut Pasteur, 25 rue du Dondel ROUX, Paris), under the number 1-1476.
- the present invention also encompasses insect cells infected with a recombinant baculovirus according to the invention.
- the expression and production of the recombinant monoclonal antibody Hu-Ac is obtained in vitro in insect cells according to the invention.
- Infection of the cells with a double recombinant baculovirus in accordance with the invention results in the simultaneous production of the H and L chains. These chains come together to reconstitute the Hu-Ac antibody which is subsequently secreted in the culture medium. .
- the present invention also relates to a process for the preparation of a humanized recombinant antibody, characterized in that it comprises a step at during which insect cells infected with a recombinant baculovirus according to the invention are cultivated, and a step during which said antibody is obtained from the culture medium.
- a humanized recombinant antibody in accordance with the invention can be used for diagnosis, or for therapy.
- a particularly advantageous use, in the case of the humanized antibody K20, relates to obtaining immunosuppressive drugs.
- MAb K20 is a murine antibody produced by a hybridoma. It is directed against the ⁇ subunit of the CD29 receptor of lymphocytes [BOUMSELL et al. , J. Exp. Med. 152, p. 229 (1980)].
- the total RNA of the hybridoma producing the monoclonal antibody K20 was extracted using the "RNA extraction Kit” from PHARMACIA.
- the cDNA is synthesized from 10 ⁇ g of RNA by reverse transcription (First-Strand cDNA Synthesis kit; PHARMACIA).
- variable parts of the heavy chains (VJJ) and light chains (VL) are amplified by PCR (polymerase chain amplification) from 1 ⁇ g of single-stranded cDNA, using Taq DNA polymerase.
- the amplification products are purified by electrophoresis on 1.2% agarose gel to separate them. oligonucleotides; the band corresponding to the desired product is excised from the gel, and the DNA is eluted by centrifugation (microcentrifuge SPIN-X, COSTAR, Cambridge, MA), then extracted with phenol / chloroform and precipitated with ethanol,
- This primer is complementary to the consensus sequence at the 3 'end of the VK variable region of the murine genes, and has a BglII site (underlined).
- the cDNA obtained was amplified by PCR using on the one hand the primer VKIFOR above, and on the other hand the primer VKIBAC: * VK1BAC (SEQ ID NO: 2): 5'- GAC ATT CAG CTG ACC CAG TCT CCA -3 * (PvuII site underlined).
- the amplification product was recovered by electrophoresis on agarose gel, extraction with phenol / chloroform and precipitation with ethanol, then digested with PvuII and BglII. and the fragment obtained was cloned into phage M13VKPCR1 (ORLANDI et al., cited above), previously digested with PvuII and Bell, to give phage M13VK.K20PCR1 (FIG. 1A).
- 2- Clonacre of the variable region of the heavy chain yl of K20 2- Clonacre of the variable region of the heavy chain yl of K20:
- VH1BAC 5'-AG GT (C / G) (A / C) A (A / G) CTG CAG (C / G) AG TC (A / T) GG-3 '( Pstl site underlined).
- the amplification product was purified as described above, then digested with BstEII and Pstl. and the fragment obtained was cloned into phage M13VHPCR1
- FIG. 1A represents the stages of the cloning of the V ⁇ and V H sequences of K20. Phages M13VK.K20PCR1 and
- M13VHK20PCR1 include, in addition to the K20 sequences, an Ig H chain promoter (P), and the leader sequence
- the sequence of the insert coding for the variable region V ⁇ of the light chain of the antibody K20 is represented in FIG. 2 A, and identified on the list of sequences in the appendix under the number SEQ ID NO: 5.
- the sequence of the insert coding for the VJJ variable region of the heavy chain of the antibody K20 is represented in FIG. 2B, and identified on the list of sequences in the appendix under the number SEQ ID NO .- 6.
- the locations CDRs, as well as those of the primers which have been used, and those of the restriction sites which have allowed cloning are indicated in these Figures 2A and 2B.
- FIG. 1B represents the stages of humanization of the variable regions V ⁇ and Vg of K20. 1. Humanization of the variable region of the light chain K of K20:
- M13VKPCR1 contains a V ⁇ gene of mouse, which comprises the framework regions (FRs) of the K protein REI human myeloma, and the complementarity determining regions (CDRs) of the mouse monoclonal antibody D1.3 [Verhoeyen et al. , Science, 239, p 1534
- VKMUTCDR1 The framework regions of this V s rine gene were used to humanize the V ⁇ gene of K20.
- VKMUTCDR3 corresponding respectively to CDRs 1, 2, and 3 of the chain V ⁇ of K20 were built, in order to replace the CDRs V ⁇ of D1.3.
- These 3 oligonucleotides also include 12 additional nucleotides at the 5 'end and at least 12 additional nucleotides at the 3' end, including a C or G terminal, and complementary to the immediate vicinity of the CDR to be replaced.
- M13HuVKK20PCRl The phage resulting from the replacement in M13VKPCR1, of CDRs V ⁇ of D1.3 by the CDRs of V ⁇ of K20, is called M13HuVKK20PCRl
- the framework regions of the human V H gene F1 were used to humanize the VJJ gene of K20.
- the Vg FI gene was amplified by PCR from the vector M13mpl8VHFlRF. [MILILI et al., Mol. Immunol. , 28, p 753 (1991)], using the primers VH1BAK and VH1FOR described above.
- the amplification product was purified as described above, then digested with BstEII and Pstl. and the fragment obtained was cloned into phage M13VHPCR1.
- VHMUTCDR1, VHMUTCDR2, and VHMUTCDR3, corresponding respectively to CDRs 1, 2, and 3 of the VJJ chain of K20, were constructed, in order to replace the CDRs V H of F1 by those of K20.
- nucleotides corresponding to the CDRs of the humanized genes are underlined; the nucleotides initially existing in the VKREI / D1.3 gene and in the VHF1 gene are in capital letters; nucleotides changed by mutagenesis are in lowercase letters; the locations of the nucleotides deleted by mutagenesis of the initial genes are represented by dashes.
- This vector is derived from the plasmid pGmAcll5T [ROYER et al., J. Virol., 66, 3230-3235, (1992)], itself derived from the plasmid pAcl [CHAABIHI et al. , J. Virol., 67, 2664-2671 (1993)] containing the EcoRI-I fragment of the autographa californica nuclear polyhedrosis baculovirus (AcMNPV), and therefore the polyhedrin gene, and the sequences flanking said gene.
- AcMNPV autographa californica nuclear polyhedrosis baculovirus
- the plasmid pGmAcllST was deleted from a 1900 bp fragment going from an EcoRI site located upstream of the polyhedrin gene to an Xhol site located 1900 bp downstream of this E ⁇ RI site.
- Competent E. coli bacteria have been transformed by part of the ligation mixture; the screening of the colonies resulting from this transformation has allowed to select the plasmid pGmAcll6T.
- This plasmid contains a BglII site downstream of the polyhedrin promoter.
- b- Signal peptide The coding sequence of this peptide is that of the signal peptide of a mouse V H gene [NEUBERGER MS, EMBO J., 2, 1373-1378, (1983)].
- This sequence was chemically synthesized in the form of two complementary oligonucleotides having ends allowing the insertion of the duplex into a BglII site.
- 15 ⁇ g of each of the two oligonucleotides are incubated in 50 ⁇ l of buffer (1 mM Tris pH 7.5, 0.1 mM EDTA), for 5 minutes in a water bath at 70 ° C. The bath is then left to cool to room temperature (22 to 25 ° C).
- the pairing product is used directly in the ligation reactions with the plasmid pGmAcll6T previously cut with BglII.
- the ligation conditions are as follows:
- Human lymphocytes (approximately 5 ⁇ 10 8 ) were prepared from 200 ml of blood using HISTOPAQUE® (SIGMA). Total RNA was extracted from these lymphocytes using a PHARMACIA kit (RNA extraction kit). The first strand of cDNA was prepared from total RNA using the "First-Strand cDNA synthesis kit" from PHARMACIA.
- the primers used to amplify the cDNA CK are the following: * HuCKBAC (SEQ ID NO: 13): 5 '-AG CTC GAG ATC AAA CGG-3' (the Xhol site is underlined).
- This primer corresponds to a consensus sequence in 3 ′ of the sequences coding for the variable domains of the light chains of mouse immunoglobulins (JK), and contains a site of cleavage by Xhol.
- HuCKFOR SEQ ID NO: 14: 5 '-GAA GAT CTA ACA CTC TCC GCG GTT GAA G-3 * (the BglII site is underlined). This primer is complementary to the end
- Amplification with the primers HUCKBAC and HUCKFOR made it possible to obtain a fragment of approximately 340 bp containing the entire CK region framed by the Xhol and BglII sites.
- the amplification product was digested with B ⁇ lII and Xhol before being cloned into the Xhol-BglII sites of the plasmid pGmAc carrying the sequence coding for the signal peptide.
- composition of the ligation mixture is as follows: l ⁇ g of the plasmid pGmAc cut with Xhol and
- Incubation is carried out at 22 ° C for 2 hours; the ligation product is used to transform competent E. coli bacteria.
- the plasmid obtained is called pBOc.
- the humanized V ⁇ region of K20 was amplified by PCR using: as template, the DNA of the phage M13HuVKK20PCRl described in Example 2 above, - - an OPP-SoVK primer (3 '), the sequence of which is the next one:
- VKK20Hu 5 '
- VKK20Hu 5 ' (SEQ ID NO: 16): 5' - GAC ATC GAG CTC ACC CAG- 3 '(Sacl site underlined)
- Amplification was performed in 30 successive incubation cycles at 95 ° C for 30 seconds, 40 ° C for 30 seconds, and 72 ° C for 30 seconds, then was followed by incubation at 72 ° C for 10 seconds. minutes.
- the plasmid DNA of the selected clone is prepared, digested with Sac1 and Xhol, and the Sacl-Xhol fragment of 303 bp is purified.
- the SacI-Xhol fragment is introduced into pBCK.
- the composition of the ligation mixture is as follows:
- the incubation is carried out at 16 ° C for 8 hours then the ligation product is used to transform competent E. coli bacteria.
- a clone containing the plasmid pBCK-V ⁇ K20hu is selected, which will be used as a transfer vector.
- 651-654 is derived from a plasmid into which the EcoRI-P fragment of the baculovirus AcMNPV containing the plO gene has been cloned. Almost all of the coding sequence has been deleted and replaced by a BglII site allowing the insertion of sequences to be expressed under the control of the p10 promoter.
- b- Signal peptide The coding sequence of this peptide is that of a mouse V H gene (NEUBERGER MS., 1983. EMBO J, 2, 1373-1378). It has been chemically synthesized in the form of complementary strands, so that it can be inserted into a BglII site.
- c- Human constant regions (C ⁇ l): The cDNA of the coding sequence of the human C ⁇ l region was amplified by PCR using the following primers: * HuC ⁇ lBAC (SEQ ID NO: 17):
- This primer includes a Kpnl site.
- HuC ⁇ lFOR SEQ ID NO: 18: 5 '-GAAGATC TCA TTT ACC CGG AGA CAG GGA G-3' (BglII site underlined).
- the primer makes it possible to reconstitute, after amplification, a BglII site downstream of the stop codon.
- the template used to amplify the human C ⁇ l region is the same mixture of cDNAs as that used for the amplification of the CK sequences.
- the amplification product was sequenced and cloned into the transfer vector pGml6 carrying the sequence coding for the signal peptide.
- the construction obtained was called pBC ⁇ l.
- the humanized VJJ variable region of K20 was amplified by PCR using:
- the VHFOR primer differs from the VH1FOR primer in that a C has been replaced by an A to create a site
- a Pstl-Kpnl digestion of the amplification fragment obtained was carried out and the fragment obtained was inserted between the Pstl and Kpnl sites of the plasmid pBLUESCRIPT IIKS; the ligation product is used to transform competent E. coli bacteria.
- the plasmid DNA of the selected clone is prepared, digested with Pstl and Kpn11. and the Pstl- fragment
- Kpnl of 327 bp is purified.
- the loaded plasmid pBC ⁇ i-VHK20hu was used in cotransfection with the DNA of a modified baculovirus called AcSLplO [CHAABIHI et al., J. Virol., 67, 2664-2671
- the cotransfection conditions are as follows: 500 ng of viral DNA are mixed with 5 ⁇ g of plasmid DNA and 40 ⁇ l of DOTAP solution (BOEHRINGER) in 3 ml of culture medium without serum for insect cells. This mixture is used to cover 4 x 10 6 Sf9 cells (ATCC35CRL 1711); after 4 hours of contact, the cotransfection mixture is replaced with 4 ml of complete medium and the incubation is carried out at 27 ° C. for 5 days.
- the virus producing the heavy chain of the humanized K20 antibody under the control of the PlO promoter was purified by the lysis plaque technique. This virus was called bPPl- HK20hu. b- Insertion of the light chain:
- the loaded plasmid pBC ⁇ -V ⁇ K20hu was used in cotransfection with the DNA of the modified baculovirus bPPl-HK20hu.
- the double recombinants were selected by the technique of limiting dilution, associated with ELISA.
- 33LK20hu (III) was amplified by a series of passages on cultured insect cells. The viral stock was then used to infect a culture shaken in a spinner (500 ml of culture with 10 6 cells per ml).
- the culture After 72 hours of infection, the culture is harvested and centrifuged at 1000 g to clarify the supernatant. The latter was concentrated to 1/3 of its initial volume by centrifugation through a membrane having a cutoff threshold of 30 kDa (CENTRIPEP 30, Amicon) (1st centrifugation: 1000g, 20 ° C, 30 minutes; elimination of the filtrate; 2nd centrifugation: 1000g, 20 ° C, 20 minutes).
- the solution was equilibrated in a protein A binding buffer, by dilution in this buffer followed by a new concentration by centrifugation (dilution buffer: Glycine 1.5M, 3M NaCl; pH 8.9).
- the balanced solution is then passed through a protein A column, which is itself balanced in the same buffer as the Hu-K20 solution.
- the antibody is eluted with an elution buffer (0.1M acetate, 0.5M NaCl; pH3).
- the elution is followed by measuring the OD at 280 nm.
- the fractions containing the antibody were mixed and concentrated by centrifugation through a membrane having a cutoff threshold of 10 kDa
- the concentrated solution is diluted with PBS and then reconcentrated in the same way.
- the antibody solution obtained is stored at + 4 ° C in PBS (137 mM NaCl; 2.7 mM KC1; 4.3 mM Na 2 HPO 4 -7H 2 0; 1.4 mM KH 2 P0 4 .
- the quality of the antibody was checked by polyacrylamide-SDS gel electrophoresis, using a commercial human IgG1 (SIGMA) as control. This experiment showed that the antibody unreduced chimera (intact disulfide bridges) migrates at the same level as the control human antibody.
- DTT dithiotreitol
- the proteins of the fractions comprising the antibody were transferred onto a nitrocellulose membrane, and the H and L chains were detected by antibodies specific for the human C ⁇ l and CK region.
- the selected virus AclOHK20hu-33LK20hu (lll) is multiplied on Sf9 insect cells in TGV2 medium
- the concentration of antibody produced and secreted is evaluated by ELISA; it is approximately 10 mg / l.
- CD29 receptor located on the surface of lymphocytes.
- K20 The binding of K20 to the CD29 molecule inhibits the proliferation of activated human T4 lymphocytes [GROUX et al., Nature, 339, 152-154, (1989)].
- the suppressive effect of K20 on T cell proliferation makes it possible to envisage the use of this antibody in the prevention of transplant rejection.
- CD29 were fixed on a glass slide and then incubated in the presence of Hu-K20 produced in accordance with the invention, parental murine K20, or buffer alone.
- the cell lines used are:
- the lymphocytes come from healthy voluntary donors (ARNAUD TZANCK Blood Transfusion Center, Saint Laurent du Var). The mononuclear cells are recovered after centrifugation on a Ficoll-Hypaque gradient (EUROBIO, France). Monocytes are removed by two one hour adhesion cycles on plastic at 37 ° C. Among the non-adherent cells thus obtained, residual monocytes, NK cells and B lymphocytes are eliminated by immunomagnetic selection using monoclonal antibodies directed against specific surface markers of these cell types and magnetic beads covered with goat anti-mouse immunoglobulin antibody (DYNABEADS, DYNAL, Norway). Lymphocyte purity is checked by checking the phenotype.
- erythrocytes are obtained from the thymus of children (4 months to 5 years) undergoing cardiological interventions at the Cardio-thoracic Center of Monaco.
- the residual erythrocytes are optionally removed by centrifugation on a Ficoll-Hypaque gradient.
- the cells (1x10 e ) are washed twice in PBS (140 mM NaCl, 3 mM KC1, Na 2 HP ⁇ 4 6 M, KH P ⁇ 4 l M, pH 7.4) 0.1% BSA (fraction V, BOEHRINGER), 0 , 1% NaN3. They are then incubated with a first antibody in a final volume of 100 ⁇ l for 30 min. at 4 ° C. After two washes, the cells are incubated in the same way with the second antibody, then at again washed twice. The cells are then fixed at the final concentration of 1x10 6 , in 500 ⁇ l of PBS 1% formaldehyde. II. RESULTS 1. Determination of dose-response curves in flow cytometry and tissue distribution.
- JURKAT E6-1, HPB-A11, RAJI, 88/66, thymocytes and human peripheral T lymphocytes cells are incubated with increasing concentrations (0.01 to 30 ⁇ g / ml) of each of the two murine and humanized K20 antibodies .
- RAM-FITC fluorescein conjugated F (ab ') 2 fragment of rabbit immunoglobulin to mouse immunoglobulin (DAKOPATTS, Denmark) at a dilution of 1/100 or RAHu- FITC (Fluorescein conjugated rabbit immunoglobulin to human IgA, IgG, IgM, DAKOPATTS, Denmark) or GAHu-FITC (fluorescein conjugated F (ab ') 2 fragment of goat immunoglobulin to human immunoglobulin (TEBU, France) diluted to 1/100.
- RAM-FITC fluorescein conjugated F (ab ') 2 fragment of rabbit immunoglobulin to mouse immunoglobulin (DAKOPATTS, Denmark) at a dilution of 1/100
- RAHu- FITC Fluorescein conjugated rabbit immunoglobulin to human IgA, IgG, IgM, DAKOPATTS, Denmark
- GAHu-FITC fluorescein conjugated F (ab
- the two antibodies Mu-K20 and Hu-K20 bind to all the cell types tested with a saturating concentration close to 0.3 ⁇ g / ml, except on the line B 88/66 which does not express ⁇ l-integrin.
- the labeling observed only in the case of the humanized K20 antibody on the 88/66 cells is due to the fixation of GAHu-FITC which recognizes the surface immunoglobulins constitutively present on the surface of these B cells. This fixation is not observed in the case of Raji cells, since these were presaturated before labeling with rabbit immunoglobulins anti-human immunoglobulins. 2. Locking of the fixing of the murine K20.
- JURKAT E6-1 cells are incubated with increasing concentrations (from 0.01 to 30 ⁇ g / ml), murine (Mu-K20) or humanized (Hu-K20) antibody K20, or human IgG1 immunoglobulins (SIGMA, France). After washing, the cells are incubated with a saturated concentration of K20-FITC (IMMUNOTECH, France) of 8 ⁇ l in a final volume of 100 ⁇ l.
- K20-FITC IMMUNOTECH, France
- Humanized K20 clearly recognizes the same epitopes as murine K20 since it specifically blocks the fixation of murine K20.
- For each of the two antibodies Mu-K20 and Hu-K20 when the cells are incubated with a concentration of l ⁇ g / ml, it is noted that there are no longer any sites available for the fixation of the murine K20 coupled to the FITC. This is correlated with the value of the saturation concentration determined previously.
- Jurkat E6-1 cells are incubated with a saturated concentration of K20-FITC (IMMUNOTECH, France) in a final volume of 100 ⁇ l. After washing, the cells are incubated with increasing concentrations (0.01 to 30 ⁇ g / ml) of each of the murine (Mu-K20) or humanized (Hu-K20) or human immunoglobulin IgG1 antibodies (SIGMA, France) .
- FIG. 6 shows that the murine and humanized K20 monoclonal antibodies displace the binding of the murine K20 coupled to the FITC, which is not observed for human immunoglobulins of the same subclass as the humanized antibody. . 50% of the displacement is reached for a concentration of Mu-K20 or Hu-K20 antibodies of the order of 30 ⁇ g / ml.
- Peripheral blood T cells come from healthy voluntary donors (ARNAUD TZANCK Blood Transfusion Center, Saint Laurent du Var). The mononuclear cells are recovered after centrifugation on a Ficoll-Hypaque gradient (EUROBIO, France). Monocytes are removed by two one hour adhesion cycles on plastic at 37 ° C. Among the non-adherent cells thus obtained, the residual monocytes, NK cells and B lymphocytes are eliminated by immunomagnetic selection using different monoclonal antibodies and magnetic beads coated with goat anti-mouse immunoglobulin antibody (DYNABEADS , DYNAL, Norway). Lymphocyte purity is controlled by phenotyping.
- a CD3 monoclonal antibody (10 ⁇ g / ml) (X35, Dr MARTIN, Rennes) is immobilized on plastic in 96-well plates in which T lymphocytes are cultured at the rate of 50,000 cells per well in a final volume of 200 ⁇ l of RPMI 1640 , 10% SVF.
- Interleukin 2 (10 ng / ml) (R AND D SYSTEM, GB) and various dilutions of antibodies Mu-K20, Hu-K20 and human Ig controls are added to the wells. After 96 hours of culture at 37 ° C., 1 mCi of [ 3 H] thymidine is added per well.
- Fibronectin and bovine albumin 50 ⁇ g / ml (SIGMA) are immobilized in 96-well plates, where JURKAT cells are incubated beforehand loaded with a fluorescent probe, BCECF
- the region of residues 207 to 218 of the integrin ⁇ i chain is critical for the binding of the antibody 4B4; This region is located between the two putative ligand binding sites (residues 120-182 and 220-231).
- the murine K20 antibody recognizes the carboxy-terminal region of ⁇ 1 (residues 426-587) (TAKADA and PUZON, 1993, J. Biol. Chem. 17597-17601). 3. Measurement of the cytotoxicity induced by the complement.
- the cells After labeling with one or other of the two antibodies Mu-K20 or Hu-K20, the cells are incubated with rabbit complement for 50 min. at room temperature. After washing, the number of dead cells / number of living cells after staining with Trypan Blue is determined.
- the murine antibody D66 (CD2) is used as a positive control.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP95930574A EP0781337A1 (fr) | 1994-09-12 | 1995-09-12 | Anticorps humanise dirige contre la chaine beta 1 des integrines |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9410858A FR2724393A1 (fr) | 1994-09-12 | 1994-09-12 | Obtention d'un anticorps monoclonal recombinant humanise a partir d'un anticorps monoclonal murin, sa production en cellules d'insecte, et ses utilisations |
FR94/10858 | 1994-09-12 |
Publications (1)
Publication Number | Publication Date |
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WO1996008564A1 true WO1996008564A1 (fr) | 1996-03-21 |
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ID=9466856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR1995/001167 WO1996008564A1 (fr) | 1994-09-12 | 1995-09-12 | Anticorps humanise dirige contre la chaine beta 1 des integrines |
Country Status (4)
Country | Link |
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EP (1) | EP0781337A1 (fr) |
CA (1) | CA2199749A1 (fr) |
FR (1) | FR2724393A1 (fr) |
WO (1) | WO1996008564A1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005538706A (ja) * | 2001-07-12 | 2005-12-22 | ジェファーソン フーテ, | スーパーヒト化抗体 |
US7166697B1 (en) | 1998-03-06 | 2007-01-23 | Diatech Pty. Ltd. | V-like domain binding molecules |
US7749697B2 (en) | 2003-09-18 | 2010-07-06 | Symphogen A/S | Method for linking sequences of interest |
EP2094728A4 (fr) * | 2006-10-26 | 2011-03-09 | Centocor Ortho Biotech Inc | Procédés d'adaptation d'anticorps monoclonaux à l'être humain |
US8283294B2 (en) | 2007-03-01 | 2012-10-09 | Symphogen A/S | Method for cloning cognate antibodies |
JP2012527978A (ja) * | 2009-05-27 | 2012-11-12 | ソラテック コーポレーション | 冗長導体のモニタリング |
JP2016512487A (ja) * | 2012-12-26 | 2016-04-28 | オンコシナジー インコーポレイテッド | 抗インテグリンβ1抗体組成物及びその使用方法 |
Citations (4)
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EP0345152A1 (fr) * | 1988-05-31 | 1989-12-06 | Institut National De La Recherche Agronomique (Inra) | Baculovirus modifié, son procédé de préparation et son application en tant que vecteur d'expression de gènes |
WO1991003252A1 (fr) * | 1989-09-01 | 1991-03-21 | Fred Hutchinson Cancer Research Center | Inhibition de l'adhesion de lymphocytes sur l'endothelium vasculaire au moyen d'une nouvelle interaction entre le recepteur matriciel extra-cellulaire et son ligand |
WO1994000585A1 (fr) * | 1992-06-25 | 1994-01-06 | University Technologies International Inc. | Baculovirus recombine contenant un promoteur de cellules d'insecte |
WO1994016094A2 (fr) * | 1993-01-12 | 1994-07-21 | Biogen, Inc. | Molecules d'anticorps anti-vla4 de recombinaison |
-
1994
- 1994-09-12 FR FR9410858A patent/FR2724393A1/fr active Pending
-
1995
- 1995-09-12 EP EP95930574A patent/EP0781337A1/fr not_active Withdrawn
- 1995-09-12 CA CA 2199749 patent/CA2199749A1/fr not_active Abandoned
- 1995-09-12 WO PCT/FR1995/001167 patent/WO1996008564A1/fr not_active Application Discontinuation
Patent Citations (4)
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EP0345152A1 (fr) * | 1988-05-31 | 1989-12-06 | Institut National De La Recherche Agronomique (Inra) | Baculovirus modifié, son procédé de préparation et son application en tant que vecteur d'expression de gènes |
WO1991003252A1 (fr) * | 1989-09-01 | 1991-03-21 | Fred Hutchinson Cancer Research Center | Inhibition de l'adhesion de lymphocytes sur l'endothelium vasculaire au moyen d'une nouvelle interaction entre le recepteur matriciel extra-cellulaire et son ligand |
WO1994000585A1 (fr) * | 1992-06-25 | 1994-01-06 | University Technologies International Inc. | Baculovirus recombine contenant un promoteur de cellules d'insecte |
WO1994016094A2 (fr) * | 1993-01-12 | 1994-07-21 | Biogen, Inc. | Molecules d'anticorps anti-vla4 de recombinaison |
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TICCHIONI M;AUSSEL C;BREITTMAYER JP;MANIE S;PELASSY C;BERNARD A;: "Suppressive effect of T cell proliferation via the CD29 molecule. The CD29 mAb 1 "K20" decreases diacylglycerol and phosphatidic acid levels in activated T cells.", THE JOURNAL OF IMMUNOLOGY, vol. 151, no. 1, 1 July 1993 (1993-07-01), pages 119 - 127 * |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7166697B1 (en) | 1998-03-06 | 2007-01-23 | Diatech Pty. Ltd. | V-like domain binding molecules |
US7405288B2 (en) | 1998-03-06 | 2008-07-29 | Diatech Pty. Ltd. | V-like domain binding molecules and polynucleotides encoding therefor |
JP2005538706A (ja) * | 2001-07-12 | 2005-12-22 | ジェファーソン フーテ, | スーパーヒト化抗体 |
US7749697B2 (en) | 2003-09-18 | 2010-07-06 | Symphogen A/S | Method for linking sequences of interest |
EP2094728A4 (fr) * | 2006-10-26 | 2011-03-09 | Centocor Ortho Biotech Inc | Procédés d'adaptation d'anticorps monoclonaux à l'être humain |
US8093068B2 (en) | 2006-10-26 | 2012-01-10 | Centocor, Inc. | Methods for use in human-adapting monoclonal antibodies |
US8283294B2 (en) | 2007-03-01 | 2012-10-09 | Symphogen A/S | Method for cloning cognate antibodies |
JP2014128698A (ja) * | 2009-05-27 | 2014-07-10 | Thoratec Corp | 冗長導体のモニタリング |
JP2012527978A (ja) * | 2009-05-27 | 2012-11-12 | ソラテック コーポレーション | 冗長導体のモニタリング |
JP2016512487A (ja) * | 2012-12-26 | 2016-04-28 | オンコシナジー インコーポレイテッド | 抗インテグリンβ1抗体組成物及びその使用方法 |
EP2938359A4 (fr) * | 2012-12-26 | 2016-10-12 | Oncosynergy Inc | Compositions d'anticorps anti-intégrine beta1 et leurs procédés d'utilisation |
US10023638B2 (en) | 2012-12-26 | 2018-07-17 | Oncosynergy, Inc. | Anti-integrin β1 antibody compositions and methods of use thereof |
AU2013370467B2 (en) * | 2012-12-26 | 2018-10-04 | Oncosynergy, Inc. | Anti- integrin beta1 antibody compositions and methods of use thereof |
RU2681994C2 (ru) * | 2012-12-26 | 2019-03-14 | Онкосинерджи, Инк. | КОМПОЗИЦИИ АНТИТЕЛА К ИНТЕГРИНУ β1 И СПОСОБЫ ИХ ПРИМЕНЕНИЯ |
EP3530284A1 (fr) * | 2012-12-26 | 2019-08-28 | Oncosynergy, Inc. | Compositions d'anticorps anti-intégrine bêta1 et leurs procédés d'utilisation |
US11142576B2 (en) | 2012-12-26 | 2021-10-12 | Oncosynergy, Inc. | Anti-integrin β1 antibody compositions and methods of use thereof |
Also Published As
Publication number | Publication date |
---|---|
FR2724393A1 (fr) | 1996-03-15 |
EP0781337A1 (fr) | 1997-07-02 |
CA2199749A1 (fr) | 1996-03-21 |
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