title: CD40 and its ligand in the regulation of humoral immunity.
abstract: T cells provide help for B cell antibody production by cell-cell contact and by soluble factors. CD40L is the predominant protein induced on activated T cells which constitutes contact-dependent help, and lack of CD40L or blocking CD40-CD40L interactions leads to severely impaired antibody production. In addition to CD40-CD40L, B and T cells express costimulatory, accessory molecules which amplify T and B cell function and allow for reciprocal dialogues during antigen presentation. Interactions between costimulatory counter-receptors can determine lymphocyte activation or nonresponsiveness, and provides a means for regulating self-tolerance.
authors.affiliation: Department of Microbiology, University of Washington, Seattle 98195.
authors.forename: S J
authors.initials: SJ
authors.lastname: Klaus
authors.forename: I
authors.initials: I
authors.lastname: Berberich
authors.forename: G
authors.initials: G
authors.lastname: Shu
authors.forename: E A
authors.initials: EA
authors.lastname: Clark
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000276:immunology*; D015703:Antigens, CD / Q000276:immunology*; D000944:Antigens, Differentiation, B-Lymphocyte / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D018106:CD28 Antigens / Q000276:immunology; D019013:CD40 Antigens; D023201:CD40 Ligand; D002450:Cell Communication / Q000276:immunology; D006801:Humans; D008211:Lymphocyte Cooperation / Q000276:immunology; D008562:Membrane Glycoproteins / Q000276:immunology*; D015398:Signal Transduction / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D018106:CD28 Antigens; D019013:CD40 Antigens; D008562:Membrane Glycoproteins; D023201:CD40 Ligand