title: Allospecific human T cell lines and clones which mediate HLA-DR restricted helper activity.
abstract: In order to analyze the immunoregulatory activity of allospecific human T cells, we have combined the techniques of limiting dilution culture and IL-2 dependent T cell growth to generate cloned alloreactive T cell lines (TCL). These TCL have been expanded in continuous culture for greater than 8 mo with retention of stable phenotypic and functional characteristics. For example, phenotypic analysis of alloproliferative TCL, utilizing a panel of monoclonal antibodies, demonstrate that these cultures are comprised of T cells belonging exclusively to the T3+ T4+ T8- "helper" or "inducer" T cell subset. Coculture of cloned alloproliferative TCL cells with a panel of allogeneic stimulators reveals that these clones are specifically reactive against the HLA-DRw1 determinant. Of greater interest, coculture of selected alloproliferative TCL cells with DRw1+ but not DRw1- B cells results in a vigorous polyclonal response as measured by the reverse hemolytic plaque assay. Although major histocompatibility complex restriction of this T-B interaction operates at the inductive level, help is at least partially unrestricted at the effector level as alloantigen-activated TCL cells provide demonstrable, although not maximal, help for DRw1- B cells.
mesh_terms: D002999:Clone Cells / Q000276:immunology; D006801:Humans; D007111:Immunity, Cellular; D007376:Interleukin-2 / Q000276:immunology; D007519:Isoantigens; D008211:Lymphocyte Cooperation; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology
chemical_list: D007376:Interleukin-2; D007519:Isoantigens; D011948:Receptors, Antigen, T-Cell