title: [CD28/B7 costimulating signal and its clinical significance].
abstract: It is necessary that the two signals are required in T cells activation. The first signal is specific, which T cell receptor could recognize and bind MHC molecule by antigen-presenting cells. Another one is nonspecific, which results from CD28/B7/CTLA4 molecules on T cells and antigen-presenting cells. The both of signals regulate function of T cells such as the activation, proliferation and secreting cytokines. CTLA4 showed the up-regulation in CD28/B7 costimulatory pathway as a negative signal. The immunosuppression could occur by blocking CD28/B7 pathway. It provided useful method for immunotherapy in the autoimmune diseases and graft-versus-host disease. But then, the activation of CD28/B7 could be valuable for the immune system recognizing and eliminating tumor cells.
authors.affiliation: Institute of Basic Medical Sciences, Academy of Military Medical Sciences, Beijing 100850, China.
authors.forename: Mei-Hua
authors.initials: MH
authors.lastname: Qu
mesh_terms: D000069594:Abatacept; D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology; D015703:Antigens, CD; D000943:Antigens, Differentiation / Q000276:immunology; D018122:B7-1 Antigen / Q000276:immunology*; D018106:CD28 Antigens / Q000276:immunology*; D060908:CTLA-4 Antigen; D006801:Humans; D018796:Immunoconjugates; D015398:Signal Transduction / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D018122:B7-1 Antigen; D018106:CD28 Antigens; D060908:CTLA-4 Antigen; C556706:CTLA4 protein, human; D018796:Immunoconjugates; D000069594:Abatacept