WO2004094477A1 - Anticuerpos recombinantes y fragmentos que reconocen el gangliosido n-glicolil gm3 y su uso para diagnostico y tratamiento de tumores. - Google Patents
Anticuerpos recombinantes y fragmentos que reconocen el gangliosido n-glicolil gm3 y su uso para diagnostico y tratamiento de tumores. Download PDFInfo
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- WO2004094477A1 WO2004094477A1 PCT/CU2004/000006 CU2004000006W WO2004094477A1 WO 2004094477 A1 WO2004094477 A1 WO 2004094477A1 CU 2004000006 W CU2004000006 W CU 2004000006W WO 2004094477 A1 WO2004094477 A1 WO 2004094477A1
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- C07K16/46—Hybrid immunoglobulins
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- C07—ORGANIC CHEMISTRY
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- 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
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/30—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
- C07K16/3076—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells against structure-related tumour-associated moieties
- C07K16/3084—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells against structure-related tumour-associated moieties against tumour-associated gangliosides
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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
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- A61P35/04—Antineoplastic agents specific for metastasis
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- C12N5/00—Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
- C12N5/10—Cells modified by introduction of foreign genetic material
- C12N5/12—Fused cells, e.g. hybridomas
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
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- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
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- 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
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- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/60—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments
- C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
- C07K2317/622—Single chain antibody (scFv)
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- C07—ORGANIC CHEMISTRY
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- C07K2317/00—Immunoglobulins specific features
- C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
- C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding
Definitions
- the present invention is fundamentally related to Immunology and in particular to obtaining less immunogenic immunoglobulins by means of genetic engineering for use in the treatment of cancer. More specifically, the present invention relates to peptide sequences encoding a recombinant monoclonal antibody or fragments derived therefrom that specifically recognize antigens containing the ganglioside N-glycolyl GM3 and not other gangliosides of the N-glycolyl or N-acetyl type, or a sulfated glycolipids.
- Prior art is fundamentally related to Immunology and in particular to obtaining less immunogenic immunoglobulins by means of genetic engineering for use in the treatment of cancer. More specifically, the present invention relates to peptide sequences encoding a recombinant monoclonal antibody or fragments derived therefrom that specifically recognize antigens containing the ganglioside N-glycolyl GM3 and not other gangliosides of the N-glycolyl or N
- Gangliosides are glyphosphingolipds that contain sialic acid and are present in vertebrate plasma membranes (Stults CLM and cois. Methods Enzymology 179: 167-214, 1989). Some of these molecules have been reported in the literature as antigens associated with tumors or tumor markers (Hakamori SH: Curr Opin Immunol 3: 646-653, 1991), so the use of anti-ganglioside antibodies has been described as useful in the diagnosis and therapeutics of cancer (Hougton AN et al. PNAS USA 82: 1242-1246, 1985; Zhang S et al. Int J Cancer 73: 42-49, 1997).
- NGc N-acetyl
- NGc N-glycolyl
- Patent application EP 0972782 A1 describes the murine monoclonal antibody 14F7, produced by the hybridoma deposited according to the Budapest treaty under accession number ECACC 98101901.
- This monoclonal antibody has isotype lgG1 and was generated from the immunization of Balb / mice.
- VLDL low density lipoproteins
- said antibody binds preferentially to the NGcGM3 ganglioside, and recognizes an antigen expressed in human breast and melanoma tumors (Carr A et al, Hybridoma 19: 3: 241-247, 2000).
- non-human monoclonal antibodies such as murine 14F7
- murine monoclonal antibodies have certain disadvantages for treating humans, particularly in a repetitive therapeutic scheme.
- murine monoclonal antibodies have a relatively short half-life in blood, in addition to losing important immunological properties such as effector functions when used in humans.
- murine monoclonal antibodies contain considerable amino acid sequences that are immunogenic when injected into humans. Numerous studies have shown that, after administration of a foreign antibody, the immune response produced in the patient can be considerably strong and substantially eliminate the therapeutic utility of the antibody after an initial treatment.
- the construction of mini-libraries of antibody fragments exposed on filamentous phages from the ibridomas allows the selection of molecules with the capacity of specific recognition of the antigen within this repertoire.
- the objective is the rapid obtaining of antibody fragments that combine the recognition of the original antibody with a smaller molecular size and the ability to be produced by a bacterial host.
- This technique allows to discard the multiple variants of non-functional or impossible to produce antibody fragments in bacteria that are obtained during the isolation and manipulation of the genes of the variable regions of a hybridoma by conventional cloning techniques (Roovers, R. OY cois Br. J. Cancer. 78, 1407-1416, 1998).
- the exchange of chains allows modifying the properties of the binding site and also combining sequences of immunoglobulins from different species, and selecting those variants that retain the specificity of recognition.
- Steinberger, P. and cois. J. Biol. Chem. 275,36073-36078, 2000, Rader, C. and cois. Proc. Nati. Acad. Sci. USA. 95,8910-8915, 1998, Beiboer, SWH et al. J. Mol. Biol. 296,833-849, 2000).
- the present invention relates to a modified antibody derived from murine antibody 14F7, which recognizes the original antigen with equal affinity and is less immunogenic when administered to patients.
- Another finding of the present invention has been the obtaining of fragments derived from said antibody that comprise variable light chain regions different from the original, but retain their properties as regards specificity, affinity, and recognition, and can be expressed by a Bacterial host both in the form of soluble molecules and presented on the surface of filamentous phages. Fragments derived from the 14F7 antibody are useful as therapeutic weapons. Additionally, the expression of scFv fragments of the 14F7 antibody on the surface of an M13 filamentous phage allows manipulating its binding site and obtaining higher affinity variants for therapeutic purposes. Another object of the present invention is the characterization of antibody fragments that only partially retain the 14F7 sequence, but retain their properties as regards specificity, affinity, and recognition.
- Both the modified antibody and the fragments obtained specifically recognize tumor cells that express the NGcGM3 antigen, which allows it to be used in the diagnosis or therapy of said tumors and have the advantage over the murine antibody from which they originated, which are less immunogenic
- Objects of the present invention are novel pharmaceutical compositions which comprise the modified 14F7 antibody or its single chain Fv fragments, wherein said antibody or fragment may be linked to a radioactive isotope useful in the location or treatment of tumors expressing the antigen.
- the object of the present invention is also a method for radioimmunodiagnostic or radioimmunotherapy of tumors expressing the ganglioside NGcGM3, where pharmaceutical compositions comprising the modified antibody 14F7 or its fragments bound to a radioactive isotope are used.
- Detailed description of the invention are described in accordance of the invention.
- a chimeric antibody derived from the murine monoclonal antibody 14F7 produced by the hybridoma with deposit number ECACC 98101901 is described, characterized in that the sequences of the hypervariable regions (CDRs) of the heavy and light chains are: HEAVY CHAIN
- said chimeric antibody is characterized in that the sequences of the framework regions (FRs) of the heavy and light chains are:
- FR3 KAILTADRSSNTAFMYLNSLTSEDSAVYYCAR FR4: WGQGTTVTVSS
- FR2 WYQQRTHESPRLLIK
- FR3 GIPSRFSGSGSGTDFTLSIISVETEDFGMYFC
- the chimeric antibody is characterized in that it contains the human heavy chain constant region lgG1 and the human light chain constant region Ck.
- the present invention relates to a modified antibody derived from murine monoclonal antibody 14F7 produced by the hybridoma with ECACC deposit number 98101901, characterized in that the regions of the heavy and light chain frames contain any of the following mutations :
- Position 12 A by R Position 18 M by V Position 19 K by R Position 20 M by V Position 38 K by R Position 40 R by A Position 42: D by G Position 48 I by V
- said modified antibody is characterized in that it contains the human lgG1 heavy chain constant region and the human Ck light chain constant region.
- the present invention refers to single chain Fv fragments derived from the 14F7 antibody that comprise the sequence of the heavy chain variable region obtained from the hybridoma (ECACC deposit 98101901), and retain the recognition specificity from 14F7.
- said Fv fragments include variable light chain regions from non-immunized mice or humans, different from the light chain variable region produced by said hybridoma, which allow their production by a bacterial host in the form of antibody fragments presented on phage filamentous or soluble molecules.
- the present invention also relates to the cell lines that express the chimeric and humanized antibodies, and the bacterial clones that produce the fragments derived from 14F7.
- the present invention relates to pharmaceutical compositions for the treatment and / or location and identification of malignant breast tumors, melanomas, their metastases and recurrences, characterized in that they contain one of the recombinant monoclonal antibodies or their fragments described herein. invention, as well as an excipient suitable for its application. Said antibody or fragment could be bound to a radioactive isotope, useful in the location and / or therapy of malignant tumors.
- the present invention relates to the use of the described recombinant antibodies, for use in the manufacture of a pharmaceutical composition useful in the treatment and / or localization and identification of malignant tumors The detailed description of how to carry out and use the present invention is given below:
- Murine antibody 14 F7 was obtained by immunization of Balb / c mice with the GM3 ganglioside (euGc) hydrophobic conjugated with low density lipoproteins and in the presence of Freund's adjuvant (EP 0972782 A1, Carr A and cois. Hybridoma 19: 3: 241-247, 2000).
- RNA is obtained from 10 6 cells of the hybridoma producing the 14F7 monoclonal antibody (murine AcM, lgG1, which recognizes the ganglioside NGcGM3, using the TRIZOL extraction method (GIBCO BRL, NY), according to the constructions of the maker.
- the synthesis of the complementary DNA (cDNA) and the amplification of the VH and VL variable regions are performed using the Access RT-PCR reagent kit (Promega, USA) according to the manufacturer's recommendations. Briefly, the reaction is carried out from 5 ⁇ g of RNA in the presence of 25 pmoles of the dT oiigonucleotide designed to hybridize in the poIyA tail of the RNA, and of the oligonucleotides corresponding to the ends of each variable region, VH and VK.
- VH and VK RCPs are digested with the restriction enzymes Eco RV-Nhe I, for VH, and Eco RV-Sa / I for VK, and cloned into the respective expression vectors (Coloma MJ and cois. J Immunol Methods 152: 89-104, 1992).
- the VH region is cloned into the PAH4604 vector which has a human lgG1 constant region included and as a selection marker the L-histidinol resistance gene.
- the VK region is cloned into the PAG4622 vector, which carries a mycophenolic acid resistance gene and a human kappa constant region.
- the resulting genetic constructs are named 14F7VH-PAH4604 and 14F7VK-PAG4622, respectively.
- NS0 cells are electroporated with 10 ⁇ g of 14F7VH-PAH4604 and 10 ⁇ g of 14F7VK-PAG4622 linearized with the enzyme Pv I.
- the DNAs are precipitated with ethanol, mixed and dissolved in 50 ⁇ L of SSTF (phosphate buffered saline). Approximately 10 7 cells are grown to semiconfluence and collected by centrifugation, subsequently resuspended in 0.5 mL of SSTF together with the DNA in an electroporation cuvette. After 10 min on ice the cells are subjected to a pulse of 200 V and 960 F, and kept on ice for 10 min.
- SSTF phosphate buffered saline
- the cells are grown in 96-well plates in selective medium, Modified Dulbecco (DMEM-F12) with 10% fetal calf serum (SFT) and 10 mM L-histidinoI. Transfected clones become visible 10 days after the selection medium is added.
- DMEM-F12 Modified Dulbecco
- SFT fetal calf serum
- chimeric immunoglobulin is determined by ELISA based on the supernatant of the clones.
- polystyrene plates High binding, Costar
- human anti-IgG goat serum Sigma
- SSTF-t phosphate buffered saline, 0.5% Tween-20, pH 7.5
- culture supernatant samples diluted in SSTF-t-SFT are added for one hour at 37 ° C.
- the plates are washed again with SSTF-t and incubated with a goat serum anti-peroxidase-conjugated human kappa chain (Jackson), one hour at 37 ° C.
- the plates are subsequently washed in the same manner and incubated with a citrate phosphate buffer solution pH 4.2 which contains the o-phenylenediamine substrate. After 15 min the absorbance is measured at 492 nm.
- the ability of antigen recognition by the chimeric antibody is verified by a competitive ELISA using the gangliosides NGcGM3 and NAcGM3.
- polystyrene plates (Polysorp, Nunc) are coated with 50 ⁇ L of a solution at 4 ⁇ g / mL of NGcGM3 or NAcGM3 in methanol and incubated for one hour at 37 ° C. They are blocked with 200 ⁇ L of a 1% bovine serum albumin (SAB) solution in Tris-HCI buffer, pH 7.8-8.0 for one hour at 37 ° C.
- SAB bovine serum albumin
- variable domains of 14F7 are analyzed with the AMPHI Program (Margalit H et al. J Immunol 138: 2213-2229, 1987), which allows the identification of segments of 7 or 1 1 amino acids with an unfriendly helix structure, which has been related to T immunogenicity.
- AMPHI Program Margalit H et al. J Immunol 138: 2213-2229, 1987
- These algorithms in this case predict fragments related to the presentation of T epitopes in the variable regions of the heavy and light chains of the murine monoclonal antibody 14F7.
- variable domains of 14F7 are compared with the sequences of variable regions of human immunoglobulins reported, to identify the human immunoglobulin that has greater homology with the murine molecule under analysis.
- SWISSPROT database available on the Internet can be used through the BLAST program (Altschul SF and cois. Nucleic Acids Res 25: 3389-3402, 1997).
- the essence of the method lies in achieving a reduction in immunogenicity by the rupture or humanization of the possible T epitopes, with a minimum of mutations in the FRs, specifically in those segments that have an unfriendly helix structure, excluding those positions involved with the three-dimensional structure of the antigen recognition site.
- the sequences of the variable regions of VH and VL of the murine immunoglobulin are compared with the most homologous human and the residues that differ between the murine sequence and the human sequence are identified, only in the unfriendly segments remaining within the FR region (Kabat E, Sequences of proteins of immunological interest, Fifth Edition, National Institute of Health, 1991). These "murine" residues will be susceptible to death due to the fact that they are in the same position in the human sequence.
- the genetic constructs corresponding to the VH and VL regions of the 14F7hT antibody are obtained, by the method described above, they are cloned into the respective expression vectors, similar to that described above in the case of the construction of the chimeric Ac, obtaining the following genetic constructions: 14F7hTVK-PAG4622 and 14F7hTVH-PAH4604.
- the transfection of these genes to cells NSO is exactly under the same conditions described for the chimeric antibody.
- the clones that produce the humanized antibody are also detected by ELISA.
- the specific recognition ability of the antigen by the humanized antibody is verified by a competitive ELISA using the gangliosides NGcGM3 and NAcGMS. The procedure is identical to that described for the chimeric antibody.
- the messenger RNA is isolated from the 14F7 hybridoma cells, the complementary DNA is synthesized and the sequences corresponding to the heavy and light chain variable regions are amplified separately, using two sets of oligonucleotides designed to hybridize with a wide range of murine variable regions.
- the amplified heavy chain variable regions are purified, digested with the appropriate enzymes and bound to the pHG-1 m fagomide vector (designed for the presentation of single chain antibodies on the surface of filamentous phage), previously digested with the same enzymes .
- the products of the ligation reaction are purified and introduced by electroporation into bacteria of the TG1 strain of E.coli.
- the transformed bacteria make up a semi-library of heavy chain variable regions of limited diversity (all from the 14F7 hybridoma).
- the DNA corresponding to this semi-library is purified and ligated separately to collections of variable light chain regions (previously purified and digested with the appropriate enzymes).
- the genetic constructions in bacteria of strain TG1 are introduced by electroporation, to form different types of independent libraries.
- One of them is a mini-library of limited diversity built with the light chain variable regions also obtained from the 14F7 hybridoma cells.
- Chain exchange libraries are also obtained, where the heavy chain variable regions from the hybridoma are combined with diverse collections of variable light chain regions obtained from murine and human lymphocytes.
- Colonies are taken at random from each library to produce phages from them using the auxiliary phage M13 K07.
- the recognition of N-glycolyl GM3 by phage carrying antibody fragments is directly analyzed through a solid phase immunoenzymatic assay (ELISA). Clones producing functional fragments are thus located.
- ELISA solid phase immunoenzymatic assay
- phage carrying antibody fragments are produced from the total mixture of transformed bacteria that each library forms.
- the phage mixture obtained is contacted with the N-glycolyl GM3 antigen bound to a surface solid, the phage carrying antibody fragments with binding capacity are retained and the rest is removed by thorough washing.
- the bound phages are eluted by a change in pH and multiplied to obtain a new phage mixture that serves as a starting material for a new cycle of selection on the antigen. After several cycles of selection, the recognition of antibody fragments presented on phages from colonies is analyzed. In this way, additional clones producing functional fragments are identified, which were diluted in the initial libraries.
- the characterization of the antibody fragments produced by the Ions includes and analysis of their specificity by ELISA against a panel of related gangliosides, the study of tumor recognition by immunohistochemistry, the evaluation of their ability to be produced as antibody fragments. soluble functional, outside the context of its phage display, and the complete sequencing of its variable regions.
- Example 1 Obtaining the Chimeric Monoclonal Antibody 14F7.
- the cDNA synthesis and PCR amplification of the VH and VK murine variable regions was performed with the Vent Polymerase enzyme using specific oligonucleotides with Eco RV-A / ⁇ e I restriction sites for VH, and Eco RV-Sa / 1 for VK
- the oligonucleotides used as primers were the following:
- Oligonucleotide 1 (hybrid in the signal peptide): 5 'ggg gatatc cace atg gaa agg falls tgg ate ttt etc ttc ctg 3'
- Oligonucleotide 2 (hybrid in JH1):
- Oligonucleotide 1 (hybrid in the signal peptide): 5 'ggg gatatc cace atg gt (at) t (tc) c (ta) ca ect cag (at) t (ac) ctt gga ctt 3'
- Oligonucleotide 2 (hybrid in VLJ5):
- RV-Nhe I for VH
- Eco RV-Sa / 1 for VK
- PAH4604 and PAG4622 for VH and VK respectively.
- the PAH4604 vector has the human constant region lgG1, and the PAG4622, a human kappa constant region. (Coloma J and cois J Immunol Methods 152: 89-104, 1992).
- NS0 cells were electroporated with 10 ⁇ g of 14F7VH-PAH4604 and 10 ⁇ g of 14F7VK-PAG4622 linearized with the enzyme Pvu I.
- the DNAs were precipitated with ethanol, mixed and dissolved in 50 ⁇ L of SSTF.
- Approximately 10 7 cells grown to semiconfluence were collected by centrifugation and resuspended in 0.5 mL of SSTF together with the DNA in an electroporation cuvette. After 10 min on ice the cells were subjected to a pulse of 200 V and 960 F and incubated on ice for 10 min.
- the cells were grown in 96-well plates in selective medium, Dulbecco Modified (DMEM-F12) with 10% SFT and 10 mM L-histidinol. Transfected clones become visible 10 days after the selection medium is added. The production of chimeric immunoglobulin is determined by ELISA based on the supernatant of the clones. For this, polystyrene plates (High binding, Costar) are coated with human anti-IgG goat serum (Sigma) in 100 mM bicarbonate carbonate buffer, pH 9.8, overnight at 4 ° C.
- the reactivity of the chimeric (Ac) antibody of 14F7 was determined by means of a competitive ELISA.
- Figure 2 shows the specificity of chimeric 14F7 compared to murine 14F7, in the recognition of polystyrene plates (Polysorp, Nunc) coated with the GM3 N-glycolylated ganglioside. Both Acs show at similar concentrations a 50% inhibition of the recognition of biotinylated murine Ac 14F7 to the antigen. While no immunoreactivity was observed when coating the plates with the N-acetylated variant of GM3 for any of the antibodies. The murine AcM ior-C5 was used as irrelevant Ac.
- Example 3 Obtaining different versions of the humanized antibody.
- VH and VK sequences of 14F7 were compared with a human sequence database, obtaining the human sequence with the highest homology with antibody 14F7, for the VH and VK region (Fig 1A and B). In both sequences, the unfriendly regions or potential T epitopes were also determined. Subsequently, the mutations necessary to convert the murine VH and VK sequences into humanized were determined, following this method of humanization of T epitopes. We next point out the maximum possible mutations that They can be done.
- Oligonucleotide 1 5 'gtc cag ctt gtg cag tct ggg gct gaa gtg gta aaa cct ggg 3'
- Oligonucleotide 2 5 'ggg gctagc tga gga gac ggt gac cgt ggt 3'
- Oligonucleotide 3 5 'ccc agg ttt tac falls ttc age ecc aga ctg falls aag ctg gac 3'
- Oligonucleotides for mutations 18, 19 and 20 of the heavy chain are Oligonucleotides for mutations 18, 19 and 20 of the heavy chain:
- Oligonucleotide 1 5 'ggg gee tea gtg agg gtg tec tgc agg 3'
- Oligonucleotide 2 5 'ggg gctagc tga gga gac ggt gac cgt ggt 3'
- oligonucleotides 1 and 2, and 3 and 4, described for these mutations are shown below.
- the overlapping of the products of the CPR was done in the same way described above.
- Oligonucleotide 1 5 'falls tgg tta aga cag gca cct ggc cag ggt ctg 3'
- Oligonucleotide 2 5 'ggg gctagc tga gga gac ggt gac cgt ggt 3'
- Oligonucleotide 3 5 'cag acc ctg gee agg tgc ctg tet taa cea gtg 3'
- Oligonucleotide 4 5 'ggg gatatc hunt atg gaa agg falls tgg ate ttt etc ttc ctg 3 '
- the mutations in position 48 were introduced to the DNAs carrying them, replacing amino acid I with V.
- the oligonucleotides 1 and 2 are shown below, and the 3 and 4, used in this mutation.
- the overlapping of the products of the CPRs was done in the same manner described above.
- Oligonucleotides for heavy chain mutation 48 Oligonucleotide 1: 5 'ctg gaa tgg gtt gga tac att 3' Oligonucleotide 2: 5 ' ggg gctagc tga gga gac ggt gac cgt ggt 3 ' Oligonucleotide 3: 5 'aat gta tec aac cea ttc cag 3 'Oligonucleotide 4: 5' ggg gatatc cace atg gaa agg falls tgg ate ttt etc ttc ctg 3 '
- Oligonucleotides for mutations 39, 40, 41, and 42 of the light chain Oligonucleotide: 5 'tat caá caá aaa cea ggt cag tet cea agg 3' Oligonucleotide 2: 5 'age gtcgac tta cgt ttc age tec age ttg gtc ce 3' Oligonucleotide 3: 5 'cct tgg aga ctg acc tgg ttt tg ttg 3 'Oligonucleotide 4: 5' ggg gatatc cace atg gt (at) t (tc) c (ta) ca cct cag (at) t (ac) ctt gga ctt 3 'After sequence verification of the previous mutations, we proceeded to introduce a mutation at position 58 to the DNAs carrying them, substituting amino acid I
- Oligonucleotides for the light chain mutation 58 Oligonucleotide 1: 5 'att tet ggg gtc ccc tec agg 3' Oligonucleotide 2: 5 'age gtcgac tta cgt ttc age tec age ttg gtc ce 3' Oligonucleotide 3: 5 'cct gga ggg gac ccc aga aat 3'
- Oligonucleotide 4 5 'ggg gatatc cace atg gt (at) t (tc) c (ta) ca cct cag (at) t (ac) ctt gga ctt 3 '
- the resulting genetic construct was named 14F7hTVK.
- Humanized VK and VH regions were cloned into vectors PAG4622 and PAH4604, forming constructions 14F7hTVH-PAH4604 and 14F7hTVK-PAG4622, respectively.
- NSO cells were electroporated with 10 ⁇ g of each of the vectors carrying the humanized variable regions, 14F7hTVH-PAH4604 and 14F7hTVK-PAG4622, previously linearized by digestion with Pvu I.
- the electroporation process and detection of the clones expressing the humanized antibody 14F7hT was identical to that described for the chimeric antibody.
- Example 4 Effect of Ac 14F7 on the decrease of tumor growth in an induction model of tumor angiogenesis in vivo.
- the tumor line (melanoma B16) mixed with matrigel was used as an angiogenesis model in vivo as an inducer of angiogenesis.
- B16 melanoma cells are mixed with 0.5 mL of matrigel and 64 units / mL of heparin, alone, in the control group, or in combination with antibodies, to be administered by subcutaneous injection into the abdominal region of the animals. 15 days after inoculation, the animals are sacrificed and the gels are removed along with dermis and epidermis residues and the tumor size is examined macroscopically. As seen in Figure 3, the tumors of mice treated with 14F7 dramatically decrease the size of the tumor mass.
- RNA was isolated with the TriPure Isolation Reagent reagent (Boehringer Mannheim, Germany) from 5.0 x 10 6 cells of the 14F7 hybridoma and the complementary DNA was synthesized with the Pro-STAR First Strand RT-PCR kit (Stratagene reagent kit) , USA).
- the heavy and light chain variable regions from the hybridoma were amplified by 26 cycles of the polymerase chain reaction, under the following conditions: 50 seconds at 94 ° C, 1 minute at 55 ° C, 1 minute at 72 ° O For this, all possible combinations of a set of degenerate oligonucleotides were used. (designed to hybridize with a wide variety of mouse variable regions), which are shown in the following table:
- ga acc agt act cea ⁇ c ct ⁇ a ⁇ ⁇ c falls aga gac agt gac cag agt ccc 3'
- ga acc agt act cea ⁇ c ct ⁇ a ⁇ ⁇ c c ⁇ a gga gac ggt gac tga ggt tec 3'
- the amplified heavy chain variable regions were purified and digested sequentially with the restriction enzymes Sfi I and ApaLI.
- the digestion products were purified and ligated with the pHG-1m fagomide vector DNA (Heber Biotec SA, Cuba) ( Figure 5).
- bacteria of the TG1 strain of E.coli were transformed by electroporation.
- the set of transformed bacteria formed a semi-library of heavy chain variable regions from the 14F7 hybridoma, with a moderate size of 2.3 x 10 4 members.
- the semi-library plasmid DNA was purified and digested sequentially with the Not I and Sal I enzymes. This DNA was ligated separately with four collections of variable light chain regions, previously digested with the same enzymes.
- Bacteria of strain TG1 were transformed with these new genetic constructs and four independent libraries were obtained. One of them was a mini-library of limited diversity that contained the variable regions, both heavy and light chain, from the 14F7 hybridoma, with a size of 1.6 x 10 6 individuals. The other three were chain exchange libraries that incorporated diverse collections of variable light chain regions previously obtained from mice (kappa isotype) and humans (kappa and lambda isotypes) and their sizes were 1.0 x 10 7 , 1.4 x 10 6 , and 1.2 x 10 6 members respectively.
- Example 6 Isolation of clones producing antibody fragments against N-glycolyl GM3.
- Phage carrying antibody fragments were produced from 92 randomly cloned clones of each library, in microtiter plate wells, according to procedures already described (Marks, JD et al. J. Mol. Biol. 222,581-597. 1991) . Its specificity was evaluated in an ELISA on polyvinyl chloride plates (Costar, USA) coated with N-glycolyl GM3 and N-acetyl GM3 at 1 ⁇ g / ml. The bound phages were detected with an anti-M13 monoclonal antibody conjugated to horseradish peroxidase (Amersham, Sweden).
- phages were produced using the M13 K07 auxiliary phage, purified by precipitation with polyethylene glycol according to the aforementioned procedure and contacted with the N-glycolyl GM3 attached to a plastic surface (Immunotubes, Nunc, Denmark). The tubes were washed extensively and the phages were eluted in the presence of 100 mmol / l triethylamine. The eluate was neutralized and used to infect bacteria of the TG1 strain of E.coli.
- Example 7 Characterization of antibody fragments derived from 14F7 that recognize N-glycolyl GM3
- the variable regions of 11 antibody fragments were completely sequenced with an automatic sequencer ALF Express II (Pharmacia, Sweden), using oligonucleotides that hybridize in the regions of the pHG-1m vector flanking the 5 ' and 3 ' ends of the sequences encoding the inserted antibody fragments. It was confirmed that the sequence of the heavy chain variable region of all corresponds to that reported for 14F7, only changes in the framework 1 and framework 4 regions, presumably introduced by the use of degenerated oligonucleotides in the CPR. The rest of the sequences, including the three CDRs had no variations.
- sequences of the light chain variable regions of the 11 clones were all different from that of 14F7 and were grouped into 5 different sequence groups, two of murine origin, one of human origin (kappa isotype) and two others of human origin, but of lambda isotype. A representative clone of each group of sequences was taken for later characterization.
- the following table shows the differences between the light chain variable regions of the selected clones, in terms of their identity with the original, their origin and isotype and the classification is subgroups according to the Kabat classification.
- Bound antibody fragments were detected using monoclonal antibody 9E10 (directed against the c-myc peptide that is fused in the gene construct to antibody fragments), at 10 ⁇ g / ml and a mouse anti-immunoglobulin conjugate (Sigma, EUS).
- Antibody fragments were purified from periplasmic fractions in a single step of metal ion affinity chromatography using the HIS-Select HC Nickel Affinity Gel matrix (Sigma, USA) according to the manufacturer's instructions.
- Figure 8 shows the activity determined by ELISA of the purified soluble fragments. Brief Description of the Figures.
- FIG. 1 The amino acid sequence of the VH variable regions is shown in the figure
- Figure 2 Recognition of the 14F7Q antibody measured by a competitive ELISA.
- X axis Express the concentration of antibodies.
- Y axis Absorbance measured at 492 nm
- the ior C5 monoclonal antibody was used as a negative control.
- Figure 4 A) Immunohistochemical study of the effect of the 14F7 Monoclonal Antibody on the formation of blood vessels. Arrows indicate immunolabelled vessels.
- Figure 5 Diagram of the pHG-1m vector.
- FIG. 6 Protein sequence of the VL regions of the 14F7 monoclonal antibody and of the selected single chain Fv fragments. The dots mean homology with the sequence of the VLs of 14F7.
- Figure 7 Specificity of recognition by phage carrying antibody fragments. Inhibition of the binding of Ac 14F7 to the gangloside is observed by the fragments exposed in the phages.
- the plates were coated with N-glycolyl GM3 and the phages were incubated with viral particles and various concentrations of 14F7.
- X axis Ac concentration 14F7
- Y axis Absorbance measured at 240 nm.
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CA2523449A CA2523449C (en) | 2003-04-23 | 2004-04-22 | Recombinant antibodies and fragments which recognize n glycolil gm3 ganglioside and its use in diagnosis and treatment of tumours |
PL04728755T PL1623997T3 (pl) | 2003-04-23 | 2004-04-22 | Rekombinowane przeciwciała i fragmenty rozpoznające gangliozyd n-glikolilo-gm3 i ich zastosowanie w diagnostyce i leczeniu nowotworów |
NZ543345A NZ543345A (en) | 2003-04-23 | 2004-04-22 | Recombinant antibodies and fragments recognizing ganglioside N-glycolyl-GM3 and use thereof in the diagnosis and treatment of tumors |
CNA2004800174578A CN1809592A (zh) | 2003-04-23 | 2004-04-22 | 识别n-乙醇酰gm3神经节苷脂的重组抗体和片段以及其在肿瘤诊断和治疗上的应用 |
AU2004232391A AU2004232391B2 (en) | 2003-04-23 | 2004-04-22 | Recombinant antibodies and fragments recognising ganglioside N-glycolyl-gm3 and use thereof in the diagnosis and treatment of tumours |
EP04728755.2A EP1623997B1 (en) | 2003-04-23 | 2004-04-22 | Recombinant antibodies and fragments recognising ganglioside n-glycolyl-gm3 and use thereof in the diagnosis and treatment of tumours |
SI200432242T SI1623997T1 (sl) | 2003-04-23 | 2004-04-22 | Rekombinantno protitelo in fragmenti prepoznajoč gangliozid n-glikolil-gm3 in njih uporaba za diagnozo in zdravljenje tumorjev |
JP2006504218A JP2006524194A (ja) | 2003-04-23 | 2004-04-22 | ガングリオシドn−グリコリルgm3を認識する組み換え抗体及び断片と、腫瘍の診断及び治療におけるその使用 |
EA200501653A EA008353B1 (ru) | 2003-04-23 | 2004-04-22 | Рекомбинантные антитела и фрагменты, узнающие n-гликолил gm3 ганглиозид и их применение в диагностике и лечении злокачественных опухолей |
MXPA05011368A MXPA05011368A (es) | 2003-04-23 | 2004-04-22 | Anticuerpos recombinantes y fragmentos que reconocen el gangliosido n-glicolil gm3 y su uso para diagnostico y tratamiento de tumores. |
ES04728755.2T ES2535813T3 (es) | 2003-04-23 | 2004-04-22 | Anticuerpos recombinantes y fragmentos que reconocen el gangliósido N-glicolil-GM3 y su uso en el diagnóstico y tratamiento de tumores |
BRPI0409664-9A BRPI0409664A (pt) | 2003-04-23 | 2004-04-22 | anticorpo recombinante, fragmento fv de cadeia simples derivado do anticorpo monoclonal murino 14f7, linhagem celular, composição farmacêutica e reativo para a localização e identificação "in vivo" de tumores malignos |
HR20050922A HRP20050922A2 (en) | 2003-04-23 | 2005-10-21 | Recombinant antibodies and fragments which recognize n-glycolil-gm3 ganglioside and its use in the diagnosis and treatment of tumours |
TNP2005000274A TNSN05274A1 (en) | 2003-04-23 | 2005-10-21 | Recombinant antibodies and fragments which recognize n-glycolyl-gm3 ganglioside and its use in the diagnosis and treatment of tumours |
IL171541A IL171541A (en) | 2003-04-23 | 2005-10-23 | Recombinant antibodies and segments that detect n - glycolyl - gm3 ganglioside and their use in tumor diagnosis and treatment |
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CU2003-0092 | 2003-04-23 | ||
CU20030092A CU23403A1 (es) | 2003-04-23 | 2003-04-23 | Anticuerpos recombinantes y fragmentos que reconocen el gangliósido n-glicolil gm3 y su uso para diagnóstico y tratamiento de tumores |
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JP (1) | JP2006524194A (es) |
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