title: Cloned T cells with "co-helper" activity. I. Biologic activities of the clone.
abstract: Clones of sheep erythrocyte-(SRBC) specific helper T cells with the surface phenotype Thy-1+, Ly-1+, Ly-2- have been derived that grow in vitro in the absence of exogenous antigen or added growth factors. The IL 2-independent clone, 101.6 has been shown to produce a supernatant factor that augments the primary anti-SRBC but not anti-burro RBC responses of whole spleen cells or Ly-1 T plus B cell cultures. The supernatant does not help B cells directly. This augmenting activity is terminated "co-helper" because the enhancement requires the presence of normal Ly-1 T cells. The supernatant of 101.6 was not shown to contain IL 2; co-helper activity was distinguishable from IL 2 activity by absorption with SRBC but not with Con A blasts, and we observed that co-helper activity does not act on spleen cells that differ at the major histocompatibility complex.
mesh_terms: D000042:Absorption; D000818:Animals; D000921:Antibody-Producing Cells / Q000276:immunology; D002999:Clone Cells / Q000276:immunology; D000939:Epitopes; D006462:Hemolytic Plaque Technique; D007376:Interleukin-2 / Q000096:biosynthesis; D007519:Isoantigens / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010527:Perissodactyla; D012756:Sheep; D013045:Species Specificity; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology* / Q000378:metabolism
chemical_list: D000939:Epitopes; D007376:Interleukin-2; D007519:Isoantigens