title: Differentiation of human B lymphocyte subpopulations induced by an alloreactive helper T-cell clone.
abstract: We have used cloned alloreactive helper T cells to determine if direct T cell-B cell interaction can induce differentiation of human peripheral blood B cells which do not respond to pokeweed mitogen (PWM). T-cell clone 2F8 was derived from a one-way mixed lymphocyte reaction. 2F8 cells are T3+T4+T8-IL-2R+ and proliferate in response to irradiated stimulator cells, but not autologous cells, in the absence of exogenous interleukin-2. 2F8 cells provide allospecific help for polyclonal proliferation and differentiation of B cells in the absence of any other stimulus. The magnitude of this response is comparable to that of the response of the same B cells to PWM and fresh autologous T cells. 2F8 cells could also provide nonspecific help for unrelated donor B cells in the presence of PWM, with no requirement for costimulation by irradiated stimulator cells. Allospecific stimulation of B cells was completely inhibited by antibodies to class II major histocompatibility complex (MHC) framework determinants and was abrogated by 1000-rad irradiation. Cloned 2F8 T cells stimulated differentiation of both small, high-density B cells and larger B cells, generating up to 30% plasma cells with either fraction. B cells forming rosettes with mouse erythrocytes were also induced to differentiate by the helper T cell clone. As found previously, neither small, high-density B cells nor mouse rosette+ B cells responded well to PWM. Direct interaction with allospecific T cells induces differentiation of a broader spectrum of B cells than soluble growth and differentiation factors in conjunction with polyclonal activators such as PWM and protein A containing staphylococci.
authors.affiliation: Department of Microbiology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232.
authors.forename: S J
authors.initials: SJ
authors.lastname: Anderson
authors.forename: D S
authors.initials: DS
authors.lastname: Hummell
authors.forename: A R
authors.initials: AR
authors.lastname: Lawton
mesh_terms: D000328:Adult; D001402:B-Lymphocytes / Q000166:cytology* / Q000276:immunology; D002454:Cell Differentiation; D002999:Clone Cells / Q000145:classification / Q000276:immunology; D004306:Dose-Response Relationship, Immunologic; D006649:Histocompatibility Antigens / Q000235:genetics; D006801:Humans; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D010641:Phenotype; D011043:Pokeweed Mitogens; D006377:T-Lymphocytes, Helper-Inducer / Q000145:classification / Q000276:immunology* / Q000528:radiation effects
chemical_list: D006649:Histocompatibility Antigens; D011043:Pokeweed Mitogens