title: Antigen non-specific activities in culture supernatant of ovalbumin-specific, cloned helper T lymphoma.
abstract: Antigen non-specific activities in culture supernatants from clones of a radiation leukemia virus transformed, ovalbumin-specific helper T lymphoma were studied. After stimulation with ovalbumin-pulsed macrophages, these clones release factor(s) capable of providing carrier-specific help for anti-hapten antibody responses. It was found that in addition to IL 2-like activity, one clone constitutively released a suppressive factor that could inhibit polyclonal growth and differentiation of B cells stimulated with LPS. The factor inhibited activation of both syngeneic and allogeneic B cells directly, rather than via activation of accessory suppressor T lymphocytes. However, upon dilution of the supernatant, B cell growth and differentiation activities were detected. A role for a polyclonal B cell suppressor factor in the overall helper activity of the clone is proposed.
authors.forename: E
authors.initials: E
authors.lastname: Yefenof
authors.forename: R
authors.initials: R
authors.lastname: Feinman
authors.forename: E
authors.initials: E
authors.lastname: Kedar
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D002460:Cell Line; D003470:Culture Media; D005260:Female; D007108:Immune Tolerance; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D008213:Lymphocyte Activation; D008222:Lymphokines / Q000276:immunology*; D008223:Lymphoma / Q000276:immunology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D010047:Ovalbumin / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D003470:Culture Media; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D008222:Lymphokines; D010047:Ovalbumin