title: Dissociation of two signals required for activation of resting B cells.
abstract: Cellular interactions involved in the T cell-dependent activation of B cells were analyzed by using lines and clones of helper T cells specific for determinants expressed on the B cell surface. Activation of male antigen-, M locus-, and H-2-specific T cells was shown to support polyclonal Ig production by a population of B cells that did not require T-cell-B-cell interaction for induction/amplification. However, these T cells alone did not activate gradient-purified small (resting) B cells. The activation of small B cells was shown to require not only a signal derived through an antigen-specific T-helper cell-B cell interaction but in addition a second signal that could be provided by anti-Ig antibodies.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D006183:H-2 Antigens; D008213:Lymphocyte Activation; D008211:Lymphocyte Cooperation; D051379:Mice; D011947:Receptors, Antigen, B-Cell / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006183:H-2 Antigens; D011947:Receptors, Antigen, B-Cell