title: Secondary but not primary T cell responses are enhanced in CTLA-4-deficient CD8+ T cells.
abstract: Negative as well as positive co-stimulation appears to play an important role in controlling T cell activation. CTLA-4 has been proposed to negatively regulate T cell responses. CTLA-4-deficient mice develop a lymphoproliferative disorder, initiated by the activation and expansion of CD4+ T cells. To assess the function of CTLA-4 on CD8+ T cells, CTLA-4(-/-) animals were crossed to an MHC class I-restricted 2C TCR transgenic mouse line. We demonstrate that although the primary T cell responses were similar, the CTLA-4-deficient 2C TCR+ CD8+ T cells displayed a greater proliferative response upon secondary stimulation than the 2C TCR+ CD8+ T cells from CTLA-4 wild-type mice. These results suggest that CTLA-4 regulates antigen-specific memory CD8+ T cell responses.
authors.affiliation: Howard Hughes Medical Research Institute, Department of Molecular and Cellular Biology, University of California, Berkeley 94720, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Chambers
authors.forename: T J
authors.initials: TJ
authors.lastname: Sullivan
authors.forename: T
authors.initials: T
authors.lastname: Truong
authors.forename: J P
authors.initials: JP
authors.lastname: Allison
mesh_terms: D000069594:Abatacept; D000818:Animals; D015703:Antigens, CD; D000943:Antigens, Differentiation / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D060908:CTLA-4 Antigen; D002455:Cell Division; D002478:Cells, Cultured; D005260:Female; D018796:Immunoconjugates; D016130:Immunophenotyping; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D010455:Peptides
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D060908:CTLA-4 Antigen; C556707:Ctla4 protein, mouse; D018796:Immunoconjugates; D010455:Peptides; D000069594:Abatacept