title: Role of TAP-1 and/or TAP-2 antigen presentation defects in tumorigenicity of mouse melanoma.
abstract: Mutations in transporters associated with antigen processing (TAP-1 and -2) required for the transport of cytosolic endogenous peptides to the endoplasmic reticulum correlate with increased metastatic potential and reduced host survival in several malignancies. To address the possible function of TAP as a "tumor suppressor" gene, we show that correction of TAP-1 and/or TAP-2 defects in B16 mouse melanoma enhanced the cell surface expression of MHC class I molecules and significantly reduced the rate of subcutaneous tumor growth and pulmonary metastatic burden. Cytotoxic assays confirmed increased sensitivity of TAP-1 and/or TAP-2 transfected clones of B16 melanoma to cytotoxic T lymphocytes. These results indicate that the expression of TAP limits the malignant potential of tumors with implications for CD8(+) T cell-based immunotherapy in controlling growth of certain TAP-deficient malignancies.
authors.affiliation: Department of Surgery, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA. shefali_agrawal@urmc.rochester.edu
authors.forename: Shefali
authors.initials: S
authors.lastname: Agrawal
authors.forename: Keith
authors.initials: K
authors.lastname: Reemtsma
authors.forename: Emilia
authors.initials: E
authors.lastname: Bagiella
authors.forename: Soji F
authors.initials: SF
authors.lastname: Oluwole
authors.forename: Ned S
authors.initials: NS
authors.lastname: Braunstein
mesh_terms: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000276:immunology*; D000818:Animals; D017951:Antigen Presentation / Q000235:genetics / Q000276:immunology*; D015152:Blotting, Northern; D003601:Cytotoxicity Tests, Immunologic; D005434:Flow Cytometry; D015395:Histocompatibility Antigens Class I / Q000276:immunology; D007167:Immunotherapy; D008175:Lung Neoplasms / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D008297:Male; D008546:Melanoma, Experimental / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D012334:RNA, Neoplasm / Q000737:chemistry / Q000235:genetics; D013602:T-Lymphocytes, Cytotoxic; D014162:Transfection
chemical_list: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters; D015395:Histocompatibility Antigens Class I; D012334:RNA, Neoplasm; C073119:TAP1 protein, human; C486171:Tap1 protein, mouse; C489516:Tap2 protein, mouse; C071692:TAP2 protein, human