title: Differential loss of T cell signaling molecules in metastatic melanoma patients' T lymphocyte subsets expressing distinct TCR variable regions.
abstract: In this study we tested the hypothesis that loss of T cell signaling molecules in metastatic melanoma patients' T cells may affect differently T cell subsets characterized by distinct TCR variable regions. By a two-color immunofluorescence technique, expression of zeta-chain, lck, and ZAP-70 was evaluated in CD3+ T cells and in three representative T cell subsets expressing TCRAV2, TCRBV2, or TCRBV18. Partial loss of lck and ZAP-70 was found in CD3+ T cells from PBL of most melanoma patients, but not of healthy donors. The extent of zeta-chain, lck, and ZAP-70 loss depended on the TCRV region expressed by the T cells, and this association was maintained or increased during progression of disease. Coculture of patients' or donors' T cell with melanoma cells, or with their supernatants, but not with normal fibroblasts or their supernatants, down-modulated expression of zeta-chain, lck, and ZAP-70 in a TCRV region-dependent way. Immunodepletion of soluble HLA class I molecules present in tumor supernatants, but not of soluble ICAM-1, blocked the suppressive effect on T cell signaling molecule expression. T cell activation with mAbs to a single TCRV region and to CD28 led to significant and TCRV region-specific re-induction of zeta-chain expression. These findings indicate that extent of TCR signaling molecules loss in T lymphocytes from metastatic melanoma patients depends on the TCRV region and suggest that tumor-derived HLA class I molecules may contribute to induce such alterations.
authors.affiliation: Human Tumor Immunobiology Unit, Department of Experimental Oncology, Istituto Nazionale per lo Studio e la Cura dei Tumori, Milan, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Maccalli
authors.forename: P
authors.initials: P
authors.lastname: Pisarra
authors.forename: C
authors.initials: C
authors.lastname: Vegetti
authors.forename: M
authors.initials: M
authors.lastname: Sensi
authors.forename: G
authors.initials: G
authors.lastname: Parmiani
authors.forename: A
authors.initials: A
authors.lastname: Anichini
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D018106:CD28 Antigens / Q000276:immunology; D017252:CD3 Complex / Q000096:biosynthesis; D002474:Cell-Free System / Q000276:immunology; D018450:Disease Progression; D015536:Down-Regulation / Q000276:immunology; D005260:Female; D006680:HLA Antigens / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000378:metabolism; D006801:Humans; D016130:Immunophenotyping; D008213:Lymphocyte Activation / Q000276:immunology; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck) / Q000096:biosynthesis; D008297:Male; D008545:Melanoma / Q000276:immunology* / Q000378:metabolism / Q000473:pathology / Q000556:secondary*; D008565:Membrane Proteins / Q000096:biosynthesis; D008875:Middle Aged; D011505:Protein-Tyrosine Kinases / Q000096:biosynthesis; D011948:Receptors, Antigen, T-Cell / Q000096:biosynthesis; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000096:biosynthesis*; D015398:Signal Transduction / Q000276:immunology*; D012995:Solubility; D013491:Suppressor Factors, Immunologic / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism*; D014407:Tumor Cells, Cultured; D051746:ZAP-70 Protein-Tyrosine Kinase
chemical_list: D000911:Antibodies, Monoclonal; D018106:CD28 Antigens; D017252:CD3 Complex; D006680:HLA Antigens; D015395:Histocompatibility Antigens Class I; D008565:Membrane Proteins; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D013491:Suppressor Factors, Immunologic; C054979:antigen T cell receptor, zeta chain; D011505:Protein-Tyrosine Kinases; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck); D051746:ZAP-70 Protein-Tyrosine Kinase; C497261:ZAP70 protein, human