title: Establishment of continuous cultures of thy1.2+, Lyt1+, 2-T cells with purified interleukin 3.
abstract: IL-3 is a recently described lymphokine that induces the expression of the enzyme 20-alpha-hydroxysteroid dehydrogenase (20 alpha SDH) in an early T-cell precursor. We demonstrate that purified IL-3 an be used to establish continuous cultures of a discrete subpopulation of T cells with virtually 100% efficiency from normal, unstimulated splenic lymphocyte populations. Once established over a period of approximately 4-6 weeks, the cultures can be readily cloned either in soft agar or by limiting dilution. All of the established lines are Lyt1+, 2- la-, lg-, Tdt-, 20 alpha SDH+, a phenotype characteristic of helper T cells; they are therefore distinct from continuous cultures of T cells established with IL-2. although initiation of these cell lines was absolutely dependent on IL-3, once established all of the cell lines were independent of exogenously added lymphokines for their growth in vitro. However, all of the cells lines were found to constitutively produce IL-3 at high levels. None  of the cell lines constitutively produced lL-2, but could be readily induced to produce this lymphokine by treatment with phorbol-myristic acetate. The ability to produce lL-3 and lL-2 is a further indication that all the cell lines are helper T cells. The possible mechanisms by which lL-3 allows the specific differentiation and/or amplification of T cells of helper phenotype in tissue culture are discussed.
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000032:analysis; D002460:Cell Line; D002999:Clone Cells; D003470:Culture Media; D007376:Interleukin-2 / Q000494:pharmacology*; D007377:Interleukin-3; D008222:Lymphokines / Q000096:biosynthesis / Q000494:pharmacology*; D008565:Membrane Proteins / Q000032:analysis; D051379:Mice; D008807:Mice, Inbred BALB C; D013601:T-Lymphocytes / Q000166:cytology* / Q000276:immunology; D018800:Thy-1 Antigens
chemical_list: D000954:Antigens, Surface; D003470:Culture Media; D007376:Interleukin-2; D007377:Interleukin-3; D008222:Lymphokines; D008565:Membrane Proteins; D018800:Thy-1 Antigens