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WO1993017119A2 - Antigene 90k (ir-95) associe aux tumeurs - Google Patents

Antigene 90k (ir-95) associe aux tumeurs Download PDF

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Publication number
WO1993017119A2
WO1993017119A2 PCT/EP1993/000379 EP9300379W WO9317119A2 WO 1993017119 A2 WO1993017119 A2 WO 1993017119A2 EP 9300379 W EP9300379 W EP 9300379W WO 9317119 A2 WO9317119 A2 WO 9317119A2
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WIPO (PCT)
Prior art keywords
antigen
fragment
leu
cancer
ala
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PCT/EP1993/000379
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English (en)
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Stefano Iacobelli
Clara Natoli
Joseph Schlessinger
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New York University
Universita' Degli Studi ''g.D.' Annunzio''-Chieti
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Publication of WO1993017119A2 publication Critical patent/WO1993017119A2/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/564—Immunoassay; Biospecific binding assay; Materials therefor for pre-existing immune complex or autoimmune disease, i.e. systemic lupus erythematosus, rheumatoid arthritis, multiple sclerosis, rheumatoid factors or complement components C1-C9
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • 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
    • C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
    • C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
    • C07K14/4701—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals not used
    • C07K14/4748—Tumour specific antigens; Tumour rejection antigen precursors [TRAP], e.g. MAGE
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/82—Translation products from oncogenes
    • 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
    • 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
    • C07K16/3015—Breast
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/569—Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
    • G01N33/56983—Viruses
    • G01N33/56988—HIV or HTLV
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/57484—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites
    • G01N33/57488—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites involving compounds identifable in body fluids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides

Definitions

  • the invention in the field of molecular and cellular biology, relates to the purification and characterization of the 90K tumor-associated antigen (IR-95), to genetic sequences which encode the 90K antigen, to the cloning and expression of this antigen, to its production and to uses thereof.
  • IR-95 tumor-associated antigen
  • Antigens shed or secreted by tumor cells have been reported in the serum of patients with different forms of cancer. Immunoassays of some of these molecules show that they have potential use as diagnostic/prognostic indicators and for therapeutic surveillance.
  • Some of the recognized antigens include: CA125 for ovarian cancer (Bast et al., N. Engl. J. Med. 309:883-887 (1983)): MOV2 for ovarian cancer (Miotti et al., Cancer Res. 45:826-832 (1985)); CA15-3 for breast cancer (Hilkens et al., Cancer Res.
  • antigens are mostly expressed on the surface of tumor cells, some are secreted into the circulation of patients. This last category of antigens may prove useful for the serodetection, prognosis and assessment of tumor load and cancer development.
  • MAbs Monoclonal antibodies which detect tumor-associated antigens have been reported. For example. MAbs against circulating breast cancer- associated antigens have been obtained.
  • MAbs against circulating breast cancer- associated antigens have been obtained.
  • MAb, SP-2 identified a cytoplasmic antigen, termed the 90K antigen (a.k.a. ImmunoRegulin-95 or IR-95), which is expressed in more than 80% of breast cancers (lacobelli et al., Cancer Res. 46:3005-3010 (1986)).
  • the 90K antigen is distinct from other circulating antigens such as CA 15-3, CEA, and CA 125 (lacobelli et al., Breast Cancer Res. & Treat. 11:19-30 (1988); Benedetti-Panici et al., Gynecol. Oncol. 35:286-289 (1989)), it may represent an additional useful diagnostic tool for the surveillance of breast cancer and other malignant diseases.
  • the 90K antigen is referred to in European Patent Application Number
  • 90K tumor-associated antigen from: the culture fluid of a human breast cancer cell line, CG-5; the serum of a breast cancer patient; and the ascitic fluid of an ovarian cancer patient.
  • a purification procedure is provided which results in at least a 50,000 fold purification of the 90K tumor-associated antigen from the three different sources.
  • the native antigen is a glycoprotein and has an apparent molecular weight of about 95,000 daltons and is present as a high molecular weight complex with similar electrophoretic profiles and immunoreactivity from all three sources.
  • the invention is further drawn to the amino acid sequence of the 90K antigen and to the genetic sequence which encodes the 90K antigen. Therapeutic and diagnostic uses of the 90K antigen are also provided.
  • FIGURE 1 The nucleotide and amino acid sequence of the 90K protein (SEQ ID NO:1 and SEQ ID NO:2, respectively).
  • the signal peptide is boxed, the SRCR homology region is shaded, and potential asparagine-linked glycosylation sites are circled.
  • FIGURE 2 Sepharose CL-6B column chromatography of the 90K antigen which had been isolated from CG-5 tissue culture fluid (—); the scrum of a breast cancer patient ( bib); and the ascitic fluid of an ovarian cancer patient (--). Fractions were assayed for 90K activity by immunoradiometric assay (IRMA). The arrow indicates the elution volume of Dextran blue 2000.
  • FIGURE 3 Density gradient centrifugation of the 90K. antigen.
  • FIGURE 4 Molecular weight determination of the 90K antigen.
  • Figure 4A Immunoprecipitates of radioactive 90K antigen from human breast cancer cells. Aliquots (200,000 cpm thrichloroacetic acid precipitable) of ( 35 S)methionine-labeled culture fluid were immunoprecipitated with MAb SP-2 (lanes a-e) or MAb against alfa-fetoprotein (lane f), and were analyzed by SDS:PAGE in the presence (lanes a-c, and e) or absence (lane d) of 2-mercaptoethanol, followed by fluorography. Lane a contained CG-5 cells. Lane b contained MCF7 cells. Lane c contained T47D cells. Lane d contained T47D cells.
  • Lane e contained tissue culture fluid from CG-5 cells after the cells had been exposed to tunicamycin but before ( 35 S)methionine labeling.
  • Figure 4B SDS:PAGE analysis of 90K antigen purified from: CG-5 culture fluid (lane a, 620 units); serum from a breast cancer patient (lane b, 920 units); and ascitic fluid from an ovarian cancer patient (lane c, 700 units). The gels were silver stained. The molecular weight standards were: phosphorylase b (Mr 97,000) and BSA (Mr 66.000).
  • FIGURE 5 PAGE and western blot analyses of purified 90K antigen from: CG-5 culture fluid (lanes a and d); the serum of a breast cancer patient (lanes b and e); and the ascitic fluid from an ovarian cancer patient (lanes c and f).
  • Purified 90K antigen was analyzed on the 4-20% gradient gel containing 0.1 % NP-40. Lanes a-c were silver stained. Lanes d-f proteins were electroblotted onto a nitrocellulose membrane. The molecular weight standards were: 0-galactosidase (Mr 540,000) and BSA (Mr 66,000).
  • FIGURE 6 The effect of enzymatic digestion on the 90K antigen.
  • FIG. 6A Purified 90K from CG-5 culture was digested with various proteases and was analyzed on 9% SDS:PAGE followed by silver staining.
  • Figure 6B The binding of ( 125 I)labeled SP-2 to digested 90K relative to untreated control is displayed.
  • lane a was purified 90K control;
  • lane b was pronase-treated 90K antigen;
  • lane c was papain-treated 90K antigen;
  • lane d was trypsin-treated 90K antigen; and
  • lane e was chymotrypsin-treated 90K antigen.
  • lane f was neuraminidase-treated 90K antigen
  • lane g was fucosidase-treated 90K antigen
  • lane h was chondroitinase ABC-treated 90K antigen
  • lane i was ⁇ -gaiactosidase-treated 90K antigen
  • lane 1 was ⁇ -galactosidase-treated 90K antigen.
  • FIGURE 7 Plasmid map of CMV-1R95.
  • FIGURE 8 Plasmid map of CMVNEO-1R95.
  • FIGURE 9 An autoradiogram of immunoprectpitates of the first three stable clones in human mammary carcinoma BT20 cells.
  • FIGURE 10 SDS-PAGE of 35 S-methionine labeled transiently expressed IR-95 in 293 cells transfected with plasmid pCMV-IR-95.
  • FIGURE 11 Percentage of cell lysis versus various IR-95 concentrations.
  • the present invention provides a substantially purified tumor-associated antigen which has an apparent molecular weight of approximately 95 kilodalto ⁇ s (K) and is designated the 90K antigen (a.k.a. ImmunoRegulin-95 or IR-95).
  • the concentration of this tumor-associated antigen is elevated in the serum of patients with cancer, such as breast cancer, gastrointestinal malignancies, and gynecological malignancies, and also in patients with the human immunodeficiency virus (HIV).
  • the 90K antigen reacts with MAb SP-2 which was produced by immunizing mice with proteins that had been released into tissue culture fluid by human MCF-7 breast cancer cells maintained therein.
  • the hybridoma cell line which produces MAb SP-2 was deposited according to rules 28 and 28a of the European Patent Convention on April 12, 1991 at the Institut Pasteur, Collection Nationale de Cultures de Microorganisms, 28 Rue de Do Budapest Roux, 75724 Paris Cedex 15, France. This deposit has been given the Accession Number 1-1083. The cells were found to be viable on April 22, 1991. Utilizing MAb SP-2 to detect the antigen, it has been demonstrated that low levels of 90K are present in normal subjects, whereas antigen levels up to 100 times that of normal levels have been detected in 50% of patients with breast cancer. The 90K antigen has also been detected in the sera of patients having carcinomas of non-breast origin, including carcinomas of the ovary, endometrium, and colon.
  • a 90K tumor-associated antigen or determinant can be isolated from a sample containing the antigen. Any sample that contains the antigen may be utilized as a starting material according to the methods described in the invention.
  • the 90K tumor-associated antigen of the present invention is a glycoprotein found in the tissues and sera of patients with breast cancer and other malignant neoplasms, and with HIV infection.
  • the 90K protein from: the plasmas or serum of humans or other animals: naturally occurring tumor cell lines from humans or other animals which naturally produce the 90K protein; immortal cell lines from humans or other animals which do not endogenously produce the 90K protein but which have been made to do so by having been transfected with a 90K expression plasmid; and cell lines from humans or other animals which do not endogenously produce the 90K. protein, and that are capable of growing in the absence of serum additives (such as U 937 cells) and which have been transfected with the 90K gene.
  • any source of the antigen is contemplated for use in this invention including, but not limited to: the culture fluid of the human breast cancer cell line. CG-5; serum from patients with breast cancer; and ascitic fluid from patients with ovarian cancer.
  • the sample containing the antigen will be referred to simply as "the sample” and is intended to include any 90K antigen-containing sample.
  • the procedure comprises ammonium sulfate precipitation, gel filtration chromatography, ion-exchange chromatography, and adsorption to a MAb SP-2 affinity matrix.
  • ammonium sulfate precipitation gel filtration chromatography, ion-exchange chromatography, and adsorption to a MAb SP-2 affinity matrix.
  • the purification procedure used to isolate the 90K antigen from a sample is summarized in Table 1. After centrifugation of the sample, the protein was precipitated by adding solid ammonium sulfate and allowing the sample to stand overnight at 4°C. Protein precipitates were collected by centrifugation. At each step of purification, the total protein was determined and the antigen was quantified by IRMA. Virtually all 90K activity was recovered after ammonium sulfate precipitation, resulting in about a four-fold enrichment thereof.
  • ammonium sulfate-precipitated antigen was next subjected to size exclusion chromatography.
  • the 90K antigen was constantly found in a large peak eluting immediately behind the void volume of the column, implying that it is a high molecular weight complex. Minor reactivity peaks of lower molecular weight were also inconsistently observed which were probably due to degradation products.
  • the high molecular weight peak was further purified by DEAE-cellulose chromatography.
  • the 90K antigen eluted from the column at a NaCl concentration of about 0.25M NaCl.
  • the final purification was accomplished by immunoaffinity adsorption on Sepharose coupled to MAb SP-2. The coupling was done by the method of Schneider et al. (J. Biol. Chem. 257:10766-10769 (1982)).
  • Bound 90K antigen was eluted with buffer, preferably 3M MgCl 2 .
  • the purification procedure resulted in a substantially purified 90K antigen.
  • substantially purified is meant that the purification of the 90K antigen, as described herein, resulted in at least a 50,000-fold, and generally about 50,000- to about 80,000-f ⁇ ld purification of the 90K antigen.
  • the invention is thus drawn to substantially purified 90K antigen having an apparent molecular weight of approximately 95,000 daltons, as well as to antigenic determinant-containing fragments, and other fragments thereof.
  • the invention is also drawn to naturally occurring fragments of the 90K antigen.
  • the invention is further drawn to unglycosylated moieties of the 90K antigen.
  • polypeptides containing immunologically cross-reactive antigenic determinants means polypeptides having a common antigenic determinant with which a given antibody will react.
  • Such polypeptides include the glycosylated and unglycosylated moieties of the 90K antigen and fragments thereof, as well as synthetic polypeptides, or fragments thereof, and antibodies which are anti-idiotypic towards the active determinant(s) of the 90K protein. It has been demonstrated that anti-idiotypic reagents are useful as diagnostic tools for the detection of antigens carrying sites which are immunologically cross-reactive with those on antibodies (Potocnjak et al., Science 215:1637-1639 (1982)).
  • monoclonal and polyclonal antibodies can be generated to it using standard techniques which are well known to those of skill in the art (Klein, J., Immunology: The Science of Cell-Noncell Discrimination. John Wiley and Sons. New York, New York, USA (1982): Kenneth et al., Monoclonal Antibodies. Hybridoma: A New Dimension in Biological Analyses, Plenum Press, New York, New York, USA (1980); Campbell. A., "Monoclonal Antibody Technology, " In: Laboratory Techniques in Biochemistry and Molecular Biology, Vol.
  • antibodies to the 90K antigen or its derivatives which are produced in humans, or are "humanized” (i.e., non-immunogenic in a human) by recombinant DNA or other technology.
  • Humanized antibodies may be produced, for example, by replacing an immunogenic portion of an antibody with a corresponding, nonimmunogenic, portion (i.e., chimeric antibodies).
  • the purified 90K protein can be sequenced using methods which are well known to those of skill in the art.
  • Initial sequencing of the terminal amino acid sequence of the 90K protein has revealed ihe following amino acid sequence (SEQ ID NO:3): Val Asn Asp Gly Asp Met Arg Leu Ala Asp Gly Gly Ala Thr Asn Gln Gly Arg Val Glu Ile Phe.
  • SEQ ID NO:3 Val Asn Asp Gly Asp Met Arg Leu Ala Asp Gly Gly Ala Thr Asn Gln Gly Arg Val Glu Ile Phe.
  • An analysis of the amino acid composition of the 90K antigen is found in Table 4. Further characterization of the 90K antigen is provided in Table 2 which gives the effects of chemical and physical treatments on 90K activity.
  • DNA construct means any DNA sequence which has been created synthetically or through recombinant DNA technology.
  • DNA constructs include, but are not limited to, synthetic oligonucleotides, vectors and vectors containing inserts.
  • nucleotide probes which are useful for identifying the 90K antigen genes can be constructed from knowledge of the amino acid sequence of the 90K protein.
  • sequence of amino acid residues and the peptide is designated herein using either the commonly employed 3-letter or single-letter designations therefor. A listing of these three- and one-letter designations may be found in textbooks such as Lehninger, A., Biochemistry, Worth Publishers, Inc., New York, New York, USA (1975) and subsequent volumes thereof.
  • the N-terminal sequence of the first twenty-two amino acids enabled the synthesis of a 66 nucleotide long oligonucleotide which was utilized as a probe to screen a cDNA library from MCF-7 cells. In this manner, the inventors have completed the molecular cloning and have determined the complete cDNA sequence of the 90K antigen.
  • the invention comprises the amino acid sequence of the 90K antigen, the genetic sequences coding for the antigen, vehicles containing the genetic sequence, hosts transformed therewith, 90K protein production by transformed host expression, purification of the 90K protein from a sample, and utilization of the 90K antigen.
  • Figure 1 SEQ ID NO:1 and SEQ ID NO:2, respectively. It is understood that modifications of the specified amino acid and nucleic acid sequences are encompassed by the present invention. As used herein, the term "modification” is intended to mean any substitution, addition or deletion of one or more amino acids of the polypeptide fragment or nucleotides of the nucleotide sequence. These modifiications may be made by manipulating the amino acid sequence itself or by modification of the nucleic acid sequence which is then used to synthesize the peptide.
  • Changes in the nucleic acid sequence can be effected by mutating the DNA. usually by site-directed mutagenesis- The techniques of site-specific mutagenesis are well known to those of skill in the an. (see, for example, Adelman et al., DNA 2:183 (1983); Smith. M., Ann. Rev. Genetics 19:423 (1985)). Mutations include, for example, substitutions, additions, or deletions of nucleotide(s), provided that the final construct has the desired biologic activity.
  • the nucleic acid changes must not place the sequence out of reading frame and preferably should not create complementary regions that could produce secondary mRNA structure (see EP Patent Application Publication No. 75,444).
  • Amino acid sequence insertions include amino and/or carboxyl-terminal fusions from one residue to polypeptides of essentially unrestricted length, as well as intrasequence insertions of single or multiple amino acid residues. Intrasequence insertions may range generally from about 1 to about 10 residues. More preferably they range from about 1 to about 5 residues.
  • amino acid residues may be in their protected or unprotected form, using appropriate amino or carboxyl protecting groups.
  • the synthesized peptides may be glycosolated or unglycosolated.
  • the cloned nucleic acid sequences encoding the 90K protein may be operably linked to sequences controlling transcriptional expression in an expression vector, and introduced into a host cell, either prokaryotic or eukaryotic, to produce recombinant 90K protein or variants thereof.
  • a host cell either prokaryotic or eukaryotic
  • 90K protein antisense RNA or variants thereof it is also possible to express 90K protein antisense RNA or variants thereof.
  • expression vehicle means a DNA construct which is capable of directing the expression of an operably linked DNA sequence.
  • Expression vehicles include, but are not limited lo, phage and plasmid vehicles.
  • “Expression vehicles” typically contain one or more elements selected from the group consisting of, but not limited to, an operator, a promoter, a ribosome binding site, a translation-initiation signal and a translation terminator.
  • host cell means any cell capable of being transformed or transfected with a DNA construct or an expression vehicle.
  • a nucleic acid molecule such as DNA, is said to be "capable of expressing" a polypeptide if it contains expression control sequences which contain transcriptional regulatory information.
  • control sequences For expression of a polypeptide, control sequences must be “operably linked” to the nucleotide sequence which encodes the polypeptide.
  • An operable linkage is a linkage in which a nucleotide sequence encoding a polypeptide is connected to a regulatory sequence (or sequences) in such a way as to place expression of the polypeptide encoding sequence under the influence or control of the regulatory sequence.
  • Two DNA sequences are said to be operably linked if the induction of promoter function results in the transcription of the protein encoding sequence and if the nature of the linkage between the two DNA sequences does not (1) result in the introduction of a frame-shift mutation, (2) interfere with the ability of the expression regulatory sequences to direct the expression of the 90K mRNA, antisense RNA, or protein, or (3) interfere with the ability of the 90K template to be transcribed by the promoter region sequence.
  • a promoter region would be operably linked to a DNA sequence if the promoter were capable of effecting transcription of that DNA sequence.
  • regulatory regions needed for gene expression may vary between species or cell types, but generally includes 5' non-coding sequences involved with the initiation of transcription and translation, such as the TATA box, capping sequence, CAAT sequence, and the like.
  • 5' non-coding control sequences will especially include a region which contains a promoter for the transcriptional control of an operably linked gene.
  • transcriptional and translational regulatory signals can be employed, depending upon the nature of the eukaryotic host.
  • the transcriptional and translational regulatory signals can also be derived from the genomic sequences of viruses which infect eukaryotic cells, such as adenovirus, bovine papilloma virus, Simian virus, herpes virus, or the like. Preferably these control signals are associated with a particular gene which is capable of a high level of expression in the host cell.
  • Promoters from mammalian genes which encode mRNA products capable of being translated are preferred, and especially, strong promoters such as the promoter for actin, collagen, myosin, etc., can be employed, provided they also function as promoters in the host cell.
  • strong promoters such as the promoter for actin, collagen, myosin, etc.
  • promoters see generally, Hamer et al., J. Mol. Appl. Gen. 1:273-288 (1982); McKnight, S., Cell 31:355-365 (1982); Benoist et al., Nature (London) 290:304-310 (1981); Johnston et al., Proc. Natl. Acad. Sci. USA 79:6971-6975 (1982); and Silver et al., Proc. Natl. Acad. Sci. USA 81:5951-5955 (1984).
  • Transcriptional initiation regulatory signals can be selected which allow for the repression or activation of gene expression, so that expression of the operably linked genes can be modulated.
  • the vectors of the invention may further comprise other operably linked regulatory elements, such as enhancer sequences or DNA elements, which confer tissue or cell-type specific expression on an operably linked gene.
  • operably linked regulatory elements such as enhancer sequences or DNA elements, which confer tissue or cell-type specific expression on an operably linked gene.
  • the level of the 90K antigen is useful as a diagnostic indicator for cancer, including breast, ovarian and other malignancies, viral infection, including HIV, inflammation, autoimmune disease, aging, and the like.
  • the 90K antigen can be assayed by a variety of methods.
  • the 90K antigen can be assayed utilizing an enzyme-linked immunosorbent assay (ELISA) sandwich procedure.
  • ELISA enzyme-linked immunosorbent assay
  • MAb SP-2 can be utilized both as an immunoabsorbent and as an enzyme-labeled probe to detect and quantify the 90K antigen by a sandwich-type ELISA.
  • the amount of 90K present in the sample can be calculated by reference to the amount present in a standard preparation of CG-5 cell lysate using a linear regression computer program.
  • the assay has been previously described by lacobelli et al. (Breast Cancer Res. and Treatment 11:19-30 (1988)), which reference is herein incorporated in its entirety. Overexpression of the 90K antigen would be an indicator of a disorder.
  • Expression levels of the 90K antigen can also be determined by measuring the levels of RNA.
  • a nucleic acid probe can be utilized to hybridize to the RNA in the sample. Methods for hybridization are generally known to those of skill in the art (see. for example. Nucleic Acid Hybridization. A Practical Approach. IRL Press, Washington, D.C., USA (1985) and the references cited therein).
  • the 90K antigen or its genetic sequences may also be useful in therapy-Serum IR-95 levels are elevated not only in patients with cancer, but also in those affected by different physiopathological conditions (see Table 5). such as infection by HIV or other viruses, autoimmune disease, etc., all of which are characterized by a variable degree of immune deficit associated with immune activation.
  • NK natural killer
  • LAK lymphokine activated killer
  • the 90K antigen or its genetic sequences may also be useful in therapy as an immunoregulatory agent.
  • patients who suffer from a particular cancer which does not induce overexpression of the 90K antigen may be treated by infusion with the 90K antigen.
  • those patients with cancers that generate elevated levels of the 90K protein in their serum may be supplied additional 90K antigen by infusion.
  • the 90K antigen or its genetic sequences may also be useful in gene therapy (reviewed in Miller, Nature 357:455460 (June 1992).
  • an expression vector containing the IR-95 coding sequence is inserted into cells, the cells are grown in vitro and then infused in large numbers into patients.
  • a DNA segment containing a promoter of choice (for example a strong promoter) is transferred into cells containing an endogenous IR-95 in such a manner that the promoter segment enhances expression of the endogenous IR-95 gene (for example, the promoter segment is transferred to the cell such that it becomes directly linked to the endogenous IR-95 gene).
  • the 90K antigen or antagonists thereof can routinely be prepared as therapeutic agent(s) by one of skill in the art using standard techniques and references which are well known in the an (see, for example. Remington 's Pharmaceutical Sciences. 18th ed., (A.R. Gennaro, Ed.), Mack Publishing Comp., Easton. PA, USA 18042 (1990), especially chapters 8 (Pharmaceutical Preparations and Their Manufacture) and 4 (Testing and Analysis), thereof).
  • antagonist any compound that decreases the effect of the 90K antigen in vivo or in vitro.
  • Appropriate and optimum routes of administration can also be routinely determined by one of skill in the an.
  • the former include the oral. intravenous, intramuscular, subcutaneous, transdermal, in situ and bucal routes of administration among others.
  • the doses of the 90K antigen and antagonists) thereof which is useful as a treatment are “therapeutically effective” amounts.
  • a “therapeutically effective amount” means an amount of the antigen, fragment or antagonist thereof, which produces the desired therapeutic effect. This amount can be routinely determined by one of skill in the art and will vary depending upon several factors such as the particular illness from which the patient suffers and the severity thereof, as well as the patient's height, weight, sex, age, and medical history.
  • the 90K antigen of the present invention is preferably provided at a dose of between about 5 to about 5000 rag/dose/week/patient. More specifically, one preferable dose range is from 50 to 500 mg/dose/week/patient.
  • a 90K antigen antagonist can be administered.
  • the appropriate doses of the antagonist can be routinely determined by one of skill in the an as described above.
  • the antagonists) of the 90K antigen is preferably provided at a dose of between about 5 to about 5000 mg/dose/week/patient. More specifically, one preferable dose range is from 50 to 500 mg/dose/week/patient.
  • Example 1 The Examples which follow are for illustrative purposes only and are not intended to limit the scope of the invention.
  • Example 1
  • CG-5 an estrogen-supersensitive variant of the MCF-7 human breast cancer cell line (Natoli et al., Breast Cancer Res. Treat. 3:23-32 (1983)) and other human breast cancer cell lines were maintained In Dulbecco's modified Eagle's medium (DMEM) supplemented with 10% fetal calf serum (FCS) and antibiotics.
  • DMEM Dulbecco's modified Eagle's medium
  • FCS fetal calf serum
  • the murine MAb SP-2 produced by hybridoraas grown in pristane-primed Balb/c mice (lacobelli et al., Cancer Res.
  • Hybridoma cells which produce MAb SP-2 were deposited under the provisions of the European Patent Convention at the Pasteur Institute as previously described. This cell line was given the deposit number 1-1083.
  • MAb SP-2 was labeled with Na 125 I using lactoperoxidase (Thorell et al., Biochem. Biophys. Acta 251:363 (1971)).
  • the proteases and other enzymes were purchased from Sigma Chemical Corp., St. Louis, MO, U.S.A.
  • Electrophoresis reagents were purchased from Bio-Rad Laboratories, Segrate, Italy.
  • Sepharose CL-6B was purchased from Pharmacia, Uppsala,
  • Solid-Phase Radioimmunoassay A "two-step" sandwich IRMA was developed to measure 90K activity. Polystyrene beads (6.5 mm, Precision
  • the amount of 90K was calculated by reference to the amount present in standard preparations made from a pool of sera from breast cancer patients and titered to contain 40, 20, 10, and 5 arbitrary units/ml.
  • the simultaneous assay of 120 sera from breast cancer patients using IRMA and ELISA gave a correlation coefficient of 0.91 (Kendall Q test).
  • IRMA is approximately three rimes more sensitive, faster to perform, requiring less than 3 hours, and highly reproducible with an inter- and intra-assay coefficient of variation of 4%.
  • SDS-PAGE was performed essentially according to the method of Laemmli (Nature 227:680-685 (1970)) on a vertical slab gel apparatus. Samples were treated with "sample buffer” consisting of 63 mM Tris-HCI containing 1.25% SDS and 5% 2-mercaptoethanol, or 63 mM Tris HCI plus 0.25% NP-40 (Nonidet-P40, Sigma Chem. Corp., St. Louis, MO, USA). In the present study, 9% SDS-gels and 4-20% gradient gels with NP-40 were used.
  • Radiolabeling of Cells and Immunoprecipitation For metabolic labeling, 2 ⁇ 10 6 cells were incubated at 37oC for 6 hours in DMEM containing 250 ⁇ Ci/ml ( 35 S)methionine (specific activity: 1500 Ci/mmole; The Radiochemical Centre, Amersham, U.K.). Culture fluids containing the radioactive proteins were pre-ciarified as described by lacobelli et al. (Cancer Res. 46:3005-3010 (1986)), and were incubated with MAb SP-2 coated polystyrene beads at 4°C for 16 hours. The beads were washed with distilled water and were extracted with 100 ⁇ l of SDS-sample buffer for 30 min at 50oC.
  • CG-5 tissue Culture Fluid (a) CG-5 tissue Culture Fluid. CG-5 cells (Natoli et al., Breast Cancer Res. Treat. 3:23-32 (1983)) were grown in DMEM supplemented with 3% FCS using Cell Factory plastic chambers (Nunc, Roskilde. Denmark). When the cells became confluent (5 to 7 days), the culture fluid was collected. Then fresh medium was added and collected at 24 hour intervals for an additional 3 to 4 days. The concentration of 90K antigen produced under these conditions ranged from 100 to 400 units/ml.
  • the ammonium suifate precipitates were dialyzed extensively against PBS and were applied to a Sepharose CL-6B column (4.2 ⁇ 85 cm). They were equilibrated and eluted with PBS-0.5 M NaCl, pH 8.1, at a flow rate of 18 ml/hour. Five ml fractions were collected and were assayed for 90K by IRMA. The protein was quantified by the method of Bradford ⁇ Anal. Biochem. 72:248-254 (1976)). Fractions containing 90K activity were pooled, dialyzed against 0.005 M Na-phosphate buffer, pH 7.4, and were applied to a DEAE-celiulose column (2 ⁇ 8 cm) equilibrated in the same buffer.
  • Density Gradient Centrifugarion Centrifugation of the 90K antigen isolated from CG-5 tissue culture fluid, the serum of a patient with breast cancer, or ascitic fluid from a patient with ovarian cancer, after desorption from the affinity matrix, was performed in 5 ml of a CsCT isopicnic density gradient.
  • the antigen was dissolved in a CsCl solution in PBS with a starting density of 1.4 g/ml, and the gradients were formed by centrifugation in a Beckman SW 50.1 rotor at 145,000 x g for 72 h at 4°C. Fractions (0.25 ml) were collected, diluted 1:10 with PBS and were assayed for antigenic activity using 90K IRMA. The density of each fraction was determined by weighing a known volume thereof.
  • Biochemical Characterization of the Antigen This was performed directly on antigen seeded on microtiter plates. Microplates (Dynatecs) were coated with 50 ⁇ l of purified 90K (100 ng/ml of 0.05 M carbonate buffer, pH 9.6) and were incubated overnight.
  • microplates were washed and blocked with 1 % gelatin in PBS. Fifty ⁇ l of ( 125 I)labeled MAb SP-2 (approximately 50,000 cpm) were added to each well and were incubated at 37oC for 1 hour. After 3 washes with PBS, the bound radioactivity was counted in a gamma-counter. Control wells were incubated with dilution buffers under the same conditions.
  • the purification procedure used to isolate the 90K antigen from CG-5 tissue culture fluid, serum from a breast cancer patient, and ascitic fluid from an ovarian cancer patient is summarized in Table 1.
  • the total protein was determined, and the antigen was quantified by IRMA.
  • Virtually all 90K activity was recovered in the 43 % ammonium sulfate precipitate, resulting in about 4-foid enrichment. This step removed the large majority of albumin present in the initial preparation.
  • Ammonium sulfate precipitated-antigen was next subjected to size exclusion chromatography using a Sepharose CL-6B column ( Figure 2).
  • the final purification was accomplished by immunoaffinity on Sepharose CL-4B coupled to MAb SP-2. Bound activity was eluted with 3M MgCl 2 - Other eluting buffers which were used, such as glycine (pH 2.4), 1 M NaOH (pH 11.2), and 3M KSCN were less effective in antigen elution. Based on specific activity (units/ ⁇ g protein), the purification of the 90K antigen from CG-5 tissue culture fluid, serum from a breast cancer patient, and ascitic fluid from an ovarian cancer patient were 84,300, 52,277 and 83,380-foid, respectively.
  • Figure 4B compares the electrophoretic mobility on SDS:PAGE of 90K purified from CG-5 tissue culture fluid, the serum of a breast cancer patient, and ascitic fluid from an ovarian cancer patient.
  • Silver staining for protein clearly showed a major band with an apparent molecular weight of approximately 95,000 daltons.
  • the 95K band also stained with Coomassie blue but not with periodic acid-Schiff carbohydrate staining (data not shown).
  • Co-electrophoresis of the purified 95K antigen from the serum of a breast cancer patient detected by silver staining and of ( 35 S)methionine-labeled immunoprecipitates from CG-5 culture fluid detected by fluorography gave superimposable 95K bands (data not shown).
  • MAb SP-2 reacts with an antigenic determinant which has been termed the 90K antigen on the basis of its apparent molecular weight of 95,000 daltons (lacobelli et al., Cancer Res. 46:3005-3010 (1986)).
  • the 90K antigen has been termed the 90K antigen on the basis of its apparent molecular weight of 95,000 daltons (lacobelli et al., Cancer Res. 46:3005-3010 (1986)).
  • the purification of the 90K antigen from CG-5 culture fluid, the serum from a human breast cancer patient, and ascitic fluid from an ovarian cancer patient We have found that die native 90K from each of these sources exists as a high molecular weight complex that was readily dissociated into a single 90,000 daltons species upon SDS:PAGE analysis. This suggests that the native protein represents an oligomer of several minimal subunits of 90,000 daltons.
  • 90K antigen derived from each of the three sources exhibits similar behavior on size exclusion and ion-exchange chromatography, PAGE and Western blotting analyses, as well as buoyant density ultracentrifugation.
  • the antigen isolated from each of the three sources has similar amino acid com ⁇ osition and NH 2 -terminal amino acid sequence. This indicates that the 90K antigen obtained from established long-term cancer cell lines and directly from cancer patient's serum or ascitic fluid have very similar physicochemical and immunochemical properties.
  • melanoma-associated antigen termed p97, gp87, or gp95 (Brown et al., J. Immunol. 127:539-546 (1981); Dippold et al., Proc. Natl. Acad. Sci. USA 77:6114-6118 (1980); Liao et al., J. Cell. Biochem.
  • End terminal sequencing of the 90K antigen revealed the following amino acid sequence (SEQ ID NO:3): Val Asn Asp Gly Asp Met Arg Leu Ala Asp Gly Gly Ala Thr Asn Gln Gly Arg Val Glu Ile Phe.
  • a "guessmer” of 66 nucleotides was designed on the basis of codon usage frequencies (Lathe, J., Mol Biol 183:1-12 (1985)) using theamino-terminal sequence: VNDGDM(S)LADGGATNQGRVEIF (SEQ ID NO:4).
  • the nucleotide sequence (SEQ ID NO:5) utilized was as follows:
  • the guessmer or nucleic acid probe was 32 P end-labeled and was used to screen a ⁇ gt10 library prepared from MCF7 polyA + RNA (complexity: 5x10 5 ). Techniques of nucleic acid hybridization in clone identification are disclosed by Maniatis et al. and Sambrook et al.
  • the complete insert was then cloned utilizing the EcoRI partial inserts.
  • the DNA fragments were cloned into the Bluescript ® plasmid (Stratagene, La Jolla, CA).
  • the insert size was approximately 2,206 nucleotides.
  • the protein sequence was revealed to be 585 amino acids, 1,755 nucleotides. A 5' leader of 131 nucleotides and a 3' trailer of 320 nucleotides was found.
  • the complete nucleotide and projected amino acid sequence is given in Figure 1 (SEQ ID NO:1 AND SEQ ID NO:2, respectively). Included in Table 3 are Northern blot analyses of RNAs from tumors and normal tissues.
  • IR-95 Expression Plasmid Construction of an IR-95 Expression Plasmid. Using standard protocols, a 2147 bp ClaI/Xhol cDNA-fragment was subcloned into the eukaryotic, cytomegalovirus promoter-based expression vector (pCMVNEO- IR95) ( Figure - 8) containing expression units for mouse dihydrofolate reductase (DHFR) cDNA and the bacterial neomycin phosphotransferase (neo) gene for amplification and selection, respectively.
  • DHFR mouse dihydrofolate reductase
  • neo bacterial neomycin phosphotransferase
  • Electroporation Exponentially growing BT 20 cells were washed twice with PBS, were harvested by trypsinization and were pelleted. The pellet was washed three times with PBS. The cells were resuspended in PBS at a concentration of approximately 5 ⁇ 10° cells/ml. Electroporation was performed with the Gene Pulser Transfecrion apparatus from Bio-Rad Laboratories, Segrate, Italy. For stable expression, 0.8 ml of cell suspension was mixed with 20 ⁇ g of linearized plasmid DNA and 50 ⁇ g of sheared Salmon sperm DNA in an electroporation cuvette. A single pulse of increasing field strength (240-270 V) was delivered from a 500 ⁇ F capacitor at room temperature.
  • the ceils were transferred to the non-selective media as above.
  • the Trypan blue exclusion test was used for determining the viability of the cells at 10 minutes after electroporation during the mock electroporations. Selection and Amplification.
  • the cells were passaged into selective medium containing Geneticin (G418, GIBCO. Gaithersburg, MD) at 400 ⁇ g/ml. Clones were picked using metal cloning cylinders with petroleum jelly for the bottom seal. The clones were expanded and cultured in 12 well clusters (Costar, Cambridge, MA) in Alpha-MEM (GIBCO, Cat.
  • Protein A-Sepharose (Pharmacia, Uppsala, Sweden) was washed thrice with PBS and 30 ⁇ l (1:1) suspension mixed with 2 ⁇ g of MAb SP-2 and was incubated for 30 minutes at room temperature.
  • the protein A-Sepharose-SP-2 complex was washed three times with HNTG buffer (20 mM HEPES, pH 7.5/150 mM NaCl/10% glycerol/0.1 % Triton X-100) and was incubated with conditioned media for
  • Protein A-Sepharose beads were washed three times with HNTG buffer. Moist beads were suspended in 30 ⁇ l of 1 x SDS gel-loading buffer, were boiled for 3 minutes at 100oC and were immediately chilled on ice. The proteins were separated on 10% SDS-polyacrylamide gel and were analyzed by autoradiography. Results
  • a cDNA coding for the entire 585-amino acid polypeptide was placed under the transcriptional control of the cytomegalovirus early promoter.
  • the expression vector contained the neo resistance gene, which conferred cellular resistance to the aminoglycoside antibiotic G418 and therefore allowed selection of primary transfecta ⁇ ts, as well as the DHFR gene for methotrexate resistance, which was used to select for cells containing amplified transfected DNA sequences.
  • Figure 9 shows the autoradiogram of immunoprecipitates of the first three stable clones. The intensities of the bands are reflective of the relative amounts of protein secreted by each clone.
  • tunicamycin was added to the medium at a final concentration of 0.1 to 1.0 ⁇ g/ml for 16 hours.
  • lysis buffer containing 50 mM HEPES, pH 7.5, 150 mM NaCl, 1.5 mM MgCl 2 , 1 mM EGTA. 10% glycerol, 1 % Triton X-100, 2 mM phenyimethylsulfonyl fluoride (PMSF), 200 units/ml aprotinin. 10 mM sodium pyrophosphate, and 10 ⁇ g/ml leupeptin. The iysates were transferred to microfuge tubes, were vortexed for 10 seconds, and were precleared by centrifugation at 12,500 rpm for 15 minutes at 4°C.
  • PMSF phenyimethylsulfonyl fluoride
  • transiently expressing cells (cells transfected with the CMV-expression plasmid carrying the cDNA-insert) resulted in a several fold increase in signal intensity of the 95 kd band ( Figure 10: lane 2).
  • Tunicamycin treatment of transiently expressing cells reduced the signal intensity for both the 95 kd protein (lanes 4 and 6) and the 77 kd protein (lanes 3 and 5). The lunicamycin effect was dose dependent.
  • Buffer A For 1 litre: Sod. Chlo ⁇ de 13 gm, Pvt. Chloride 0.2 gm, Sod. Phosphate Dibasic. Anhydrous 1.6 gm, Sod. Sulphate 0.5 M and EDTA, 1 mM pH of the buffer titrated to 8.2.
  • Buffer B For 1 litre: Sod. Chloride 13 gm, Pvt. Chloride 0.2 gm. Sod. Phosphate Dibasic, Anhydrous 1.6 gm. Sod. Sulphate 0.3 M and EDTA, 1 mM pH of the buffer titrated to 8.2.
  • Buffer C For 1 litre; Sod . Chloride 13 gm, Pvt. Chloride 0.2 gm. Sod. Phosphate Dibasic. Anhydrous 1.6 gm, and EDTA. 1 mM pH of the solution titrated to 8.2. 4. Buffer D: For 1 litre; Sod. Phosphate Dibasic, Anhydrous 7.098 gm and Sod. Chloride 5.8 gm pH of the solution titrated to 8.
  • Buffer E For 1 litre; Sod. Phosphate Dibasic, Anhydrous 7.098 gm, Glycine 100 mM and Sod. Chloride 5.8 gm pH of the solution titrated to 8.
  • A- Ammonium Sulphate Precipitation Preclarified conditioned medium was concentrated ten fold on a hollow fibre ultrafilteration cartridge (40 KD, Nunc). Concentrated medium was precipitated with solid ammonium sulphate to 42% saturation (assuming the maximum saturation at 533 gm/litre). Ammonium sulphate was added slowly and pH was titrated back to approximately 8.0 by using dilute ammonium hydroxide. Let the solution stir overnight.
  • the precipitation should be done with solid Amm. sulphate to 42% saturation.
  • the eluates were pooled and precipitated with 70 % ammonium sulphate and stirred for at least four hours in the cold room.
  • the precipitate was collected by centrifugation at 10000 rpm and dissolved in buffer D.
  • Metal chelate sepharose (Pharmacia) was packed in a glass column under gravity to a packed volume of 4 ml. Matrix was washed extensively with water to remove ethanol. A copper sulphate solution (10 mg per ml) was passed over the matrix. Normally 10 ml of the copper sulphate solution is enough for lading of the matrix. The matrix was again washed with 10 to 20 column volumes of water to remove the excess copper sulphate. Then the matrix was washed with 10 column volumes of buffer E and equiliberaied with 20 column volumes of buffer D.
  • the dialysed protein solution was centrifuged at 10000 rpm to get rid of the coagulated protein.
  • the protein solution was diluted five fold in the equiliberation buffer and passed over the matrix twice.
  • the matrix washed with 50 column volumes of the equiliberation buffer and protein was eluted using a linear gradient of 20 column volumes each of buffer D and buffer E at a flow rate of 1 ml per minute. Normally, the protein elutes from the column in the second peak. Active fractions were pooled and concentrated on Centricon-30. The activity of purified protein was checked by immunoprecipitation.
  • Purified protein was checked for its ability to be immunoprecipitated with SP-2 monoclonal antibody.
  • 50 ⁇ l of 1:1 suspension of Protein A- Sepharose was washed three times with one ml of buffer C by brief spinning and aspirations.
  • Two ⁇ g of SP-2 MAb plus protein sample were rotated for two hours in the cold room.
  • the beads were washed three times with one ml of buffer C by repeated centrifugation and aspirations. In the end, the beads were aspirated and moist beads lysed in 1X Laemeli buffer and electrophoresed.
  • the purified protein was buffer exchanged and concentrated with Hank's balanced salt solution using Centricon-30 to 2-3 mg/ml and mixed with one volume of 2 M glucose before freezing at -20 degrees.
  • NK Natural Killer
  • LAK Lymphokine Activated Killer
  • Peripheral blood mononuclear cells were isolated from fresh heparinized blood by Ficoll-Hypaque gradient centrifugation after partial depletion of monocytes by adherence to plastic surfaces (45 min. 37°C). PBL at the concentration of 2x10 6 cells/ml were cultured in RMPI-1640 medium supplemented with 10% heat-inactivated fetal calf serum and antibiotics. Purified IR-95 was added in various concentrations (50 ng/ml to 2000 ng/ml) for 16 h. As a control , PBL were incubated in the same culture conditions for the same period of time without IR-95.
  • Circulating serum IR-95 concentrations were determined by a solid-phase. enzyme-linked, immunoabsorbent procedure that uses mAb SP-2 as the coating antibody. Levels of more man 1.75 units/ml (normal mean +/- 2SD) were considered positive determinations. The serum level of IR-95 was not affected by sex and blood group.
  • Cut off value of serum IR-95 is 1.7 units/ml (mean +/- 2 SD).
  • ADDRESSEE Sterne, Kessler, Goldstein & Fox
  • CAGGCACGGC C ATG ACC CCT CCG AGG CTC TTC TGG GTG TGG CTG CTG GTT 170
  • GAA ACC AGG AGG CAC CCA CAC CCT GGA CCT CTC CAG GGA GCT CTC GGA 554 Glu Thr Arg Arg His Pro His Pro Gly Pro Leu Gln Gly Ala Leu Gly
  • GCTTCCTTCC TCTCTGCAAT GACCTTCAAC AACCGGCCAC CAGATGTCGC CCTACTCACC 2016 TGAGGCTCAG CTTCAAGAAA TTACTGGAAG GCTTCCACTA GGCTCCACCA GGAGTTCTCC 2076

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Abstract

Antigène 90K associé aux tumeurs et purifié, ou un ou plusieurs fragments de celui-ci. Il est obtenu notamment à partir du liquide de culture de la lignée cellulaire CG-5 du cancer du sein chez la femme, du sérum d'une personne atteinte du cancer du sein, ou du liquide ascitique d'une personne atteinte du cancer ovarien. L'antigène natif a une masse moléculaire de 95 000 daltons environ et il est présent sous la forme d'un complexe à masse moléculaire élevée. On a prévu la purification et la caractérisation de l'antigène, ainsi que ses utilisations. On a également prévu des séquences nucléotidiques codant l'antigène 90K, ou un ou plusieurs fragments de celui-ci, des véhicules contenant la séquence génétique, des hôtes transformés à l'aide de ceux-ci, ainsi que la production de l'antigène, ou de ses fragments, à l'aide de l'hôte transformé.
PCT/EP1993/000379 1992-02-17 1993-02-16 Antigene 90k (ir-95) associe aux tumeurs WO1993017119A2 (fr)

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ITRM920099A IT1264490B (it) 1992-02-17 1992-02-17 Antigene 90k associato a tumori.
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