title: Targeting TARP, a novel breast and prostate tumor-associated antigen, with T cell receptor-like human recombinant antibodies.
abstract: MHC class I molecules are important components of immune surveillance. There are no available methods to directly visualize and determine the quantity and distribution of MHC/peptide complexes on individual cells or to detect such complexes on antigen-presenting cells in tissues. MHC-restricted recombinant antibodies with the same specificity of T cell receptors (TCR) may become a valuable tool to address these questions. They may also serve as valuable targeting molecules that mimic the specificity of cytotoxic T cells. We isolated by phage display a panel of human recombinant Fab antibodies with peptide-specific, MHC-restricted TCR-like reactivity directed toward HLA-A2-restricted T cell epitopes derived from a novel antigen termed TCRgamma alternative reading frame protein (TARP) which is expressed on prostate and breast cancer cells. We have characterized one of these recombinant antibodies and demonstrated its capacity to directly detect specific HLA-A2/TARP T cell epitopes on antigen-presenting cells that have complexes formed by naturally occurring active intracellular processing of the antigen, as well as on the surface of tumor cells. Moreover, by genetic fusion we armed the TCR-like antibody with a potent toxin and demonstrated that it can serve as a targeting moiety killing tumor cells in a peptide-specific, MHC-restricted manner similar to cytotoxic T lymphocytes.
authors.affiliation: Faculty of Biology, Technion-Israel Institute of Technology, Haifa, Israel.
authors.forename: Malka
authors.initials: M
authors.lastname: Epel
authors.forename: Irit
authors.initials: I
authors.lastname: Carmi
authors.forename: Sharon
authors.initials: S
authors.lastname: Soueid-Baumgarten
authors.forename: SangKon
authors.initials: S
authors.lastname: Oh
authors.forename: Tapan
authors.initials: T
authors.lastname: Bera
authors.forename: Ira
authors.initials: I
authors.lastname: Pastan
authors.forename: Jay
authors.initials: J
authors.lastname: Berzofsky
authors.forename: Yoram
authors.initials: Y
authors.lastname: Reiter
mesh_terms: D036002:ADP Ribose Transferases / Q000008:administration & dosage / Q000235:genetics / Q000494:pharmacology / Q000627:therapeutic use; D019943:Amino Acid Substitution; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000276:immunology; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics / Q000627:therapeutic use; D001427:Bacterial Toxins / Q000008:administration & dosage / Q000235:genetics / Q000494:pharmacology / Q000627:therapeutic use; D001943:Breast Neoplasms / Q000276:immunology / Q000473:pathology; D045744:Cell Line, Tumor; D018984:Epitopes, T-Lymphocyte / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D005098:Exotoxins / Q000008:administration & dosage / Q000235:genetics / Q000494:pharmacology / Q000627:therapeutic use; D005260:Female; D015789:HLA-A2 Antigen / Q000235:genetics / Q000276:immunology; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D000922:Immunotoxins / Q000276:immunology / Q000494:pharmacology / Q000627:therapeutic use; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000276:immunology / Q000473:pathology / Q000517:prevention & control; D051379:Mice; D008819:Mice, Nude; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics / Q000276:immunology*; D010446:Peptide Fragments / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D011471:Prostatic Neoplasms / Q000276:immunology / Q000473:pathology; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology*; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000276:immunology*; D037521:Virulence Factors / Q000008:administration & dosage / Q000235:genetics / Q000494:pharmacology / Q000627:therapeutic use; D023041:Xenograft Model Antitumor Assays; D000097668:Pseudomonas aeruginosa Exotoxin A
chemical_list: D036002:ADP Ribose Transferases; D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000970:Antineoplastic Agents; D001427:Bacterial Toxins; D018984:Epitopes, T-Lymphocyte; D005098:Exotoxins; D015789:HLA-A2 Antigen; D007140:Immunoglobulin Fab Fragments; D000922:Immunotoxins; D009687:Nuclear Proteins; D010446:Peptide Fragments; D011948:Receptors, Antigen, T-Cell; D011994:Recombinant Proteins; D037521:Virulence Factors; D000097668:Pseudomonas aeruginosa Exotoxin A; C413185:TARP