Distinct features of dendritic cells and anti-Ig activated B cells as stimulators of the primary mixed leukocyte reaction.
Highly enriched populations of B lymphoblasts have been isolated after culture with anti-Ig-Sepharose and compared with dendritic cells as stimulators of CD4+ T cells in the murine MLR. The two populations clearly differed in phenotype; anti-Ig blasts were FcR+, B220+, 33D1-, while dendritic cells were FcR-, B220-, 33D1+. However, as MLR stimulators, they shared many common features. Both cells (a) expressed comparable levels of class II MHC products; (b) independently stimulated the primary MLR and the production of several T derived lymphokines including IL-2 and IL-4; and (c) were comparable in stimulating freshly sensitized T cells. However, the relative potencies of dendritic cells and anti-Ig blasts as primary MLR stimulators varied in a strain-dependent fashion. Only anti-Ig blasts could stimulate across an Mls barrier, being at least 100 times more active in stimulating Mls-mismatched, MHC-matched T cells, relative to syngeneic T cells. In contrast, dendritic cells were 10-30 times more potent than anti-Ig blasts when stimulating across an MHC barrier and were likewise more effective in binding MHC-disparate T cells to form the clusters in which the MLR was generated. Dendritic cell-T cell clustering was resistant to anti-LFA-1 mAb, while B blast-T cell clustering was totally blocked. Thus, anti-Ig B lymphoblasts and dendritic cells, two cell types which differ markedly in phenotype, also differ in efficiency and mechanism for initiating responses in allogeneic T cells.
Metlay
J P
JP
Rockefeller University, New York, New York.
Puré
E
E
Steinman
R M
RM
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology; D000938:Antigen-Presenting Cells / Q000276:immunology; D000943:Antigens, Differentiation / Q000502:physiology; D000954:Antigens, Surface / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002448:Cell Adhesion; D003713:Dendritic Cells / Q000276:immunology*; D004306:Dose-Response Relationship, Immunologic; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008211:Lymphocyte Cooperation; D007959:Lymphocyte Culture Test, Mixed; D016169:Lymphocyte Function-Associated Antigen-1; D008222:Lymphokines / Q000096:biosynthesis; D051379:Mice; D016747:Minor Lymphocyte Stimulatory Antigens; D011947:Receptors, Antigen, B-Cell / Q000502:physiology
D000888:Antibodies, Anti-Idiotypic; D000943:Antigens, Differentiation; D000954:Antigens, Surface; D016169:Lymphocyte Function-Associated Antigen-1; D008222:Lymphokines; D016747:Minor Lymphocyte Stimulatory Antigens; D011947:Receptors, Antigen, B-Cell