title: Granulocyte-macrophage colony stimulating factor produced by cloned L3T4a+, class II-restricted T cells induces HT-2 cells to proliferate.
abstract: Cloned L3T4a+ antigen-specific, class II-restricted T cells can be subdivided by function and by cytokine production. All cloned T cell lines produce T cell growth factors that can be distinguished by the ability of monoclonal antibodies to inhibit the proliferation of cytokine-dependent T cell lines induced by these T cell growth factors. From these types of analyses, it has been shown that all cloned T cells that help hapten-specific B cells secrete immunoglobulin, produce interleukin 4 (IL 4). Those cloned T cells that fail to help for anti-hapten responses produce neither IL 4 nor interleukin 2 (IL 2), yet release an activity that induces the proliferation of the cytokine-dependent T cell line, HT-2. Additional analysis of the HT-2 stimulating activity has shown that it is indistinguishable from granulocyte macrophage-colony stimulating factor (GM-CSF)--this activity being produced by all cloned T cells tested. Thus GM-CSF is a product of all cloned L3T4a+ T cell lines tested thus far, and can serve as a T cell growth factor for HT-2, as well as a co-factor for in vivo derived T cells.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D003115:Colony-Stimulating Factors / Q000378:metabolism / Q000494:pharmacology*; D006098:Granulocytes; D006133:Growth Substances / Q000096:biosynthesis; D007376:Interleukin-2 / Q000096:biosynthesis; D015847:Interleukin-4; D008213:Lymphocyte Activation / Q000187:drug effects; D008222:Lymphokines / Q000096:biosynthesis; D008264:Macrophages; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology; D008815:Mice, Inbred Strains / Q000276:immunology; D013601:T-Lymphocytes / Q000187:drug effects*; D006377:T-Lymphocytes, Helper-Inducer / Q000378:metabolism*
chemical_list: D003115:Colony-Stimulating Factors; D006133:Growth Substances; D007376:Interleukin-2; D008222:Lymphokines; D015847:Interleukin-4