title: Costimulation of antitumor immunity by the B7 counterreceptor for the T lymphocyte molecules CD28 and CTLA-4.
abstract: Interaction of the B7 molecule on antigen-presenting cells with its receptors CD28 and CTLA-4 on T cells provides costimulatory signals for T cell activation. We have studied the effects of B7 on antitumor immunity to a murine melanoma that expresses a rejection antigen associated with the E7 gene product of human papillomavirus 16. While this E7+ tumor grows progressively in immunocompetent hosts, cotransfection of its cells with B7 led to tumor regression by a B7-dependent immune response mediated by CD8+ cytolytic T lymphocytes. The immune response induced by E7+B7+ tumor cells also caused regression of E7+B7- tumors at distant sites and was curative for established E7+B7- micrometastases. Our findings suggest that increasing T cell costimulation through the CD28 and CTLA-4 receptors may have therapeutic usefulness for generating immunity against tumors expressing viral antigens.
authors.affiliation: Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, Washington 98121.
authors.forename: L
authors.initials: L
authors.lastname: Chen
authors.forename: S
authors.initials: S
authors.lastname: Ashe
authors.forename: W A
authors.initials: WA
authors.lastname: Brady
authors.forename: I
authors.initials: I
authors.lastname: Hellström
authors.forename: K E
authors.initials: KE
authors.lastname: Hellström
authors.forename: J A
authors.initials: JA
authors.lastname: Ledbetter
authors.forename: P
authors.initials: P
authors.lastname: McGowan
authors.forename: P S
authors.initials: PS
authors.lastname: Linsley
mesh_terms: D000069594:Abatacept; D000818:Animals; D015703:Antigens, CD / Q000276:immunology*; D000943:Antigens, Differentiation / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology*; D000954:Antigens, Surface / Q000276:immunology*; D000956:Antigens, Viral / Q000276:immunology; D018106:CD28 Antigens; D060908:CTLA-4 Antigen; D002460:Cell Line; D005260:Female; D018796:Immunoconjugates; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D008809:Mice, Inbred C3H; D009365:Neoplasm Regression, Spontaneous / Q000276:immunology*; D009374:Neoplasms, Experimental / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014162:Transfection
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D000956:Antigens, Viral; D018106:CD28 Antigens; D060908:CTLA-4 Antigen; C556706:CTLA4 protein, human; C556707:Ctla4 protein, mouse; D018796:Immunoconjugates; D000069594:Abatacept