title: Splenocytes and bone marrow cells from T-cell deficient Nu/Nu mice secrete interleukin 3 activity after stimulation in vitro.
abstract: We show here that the combination of Concanavalin A (Con A), phorbol myristate acetate (PMA), and Ionomycin (Iono) reproducibly stimulated splenocytes from Nu/Nu mice and bone marrow cells from both normal and Nu/Nu mice to secrete interleukin 3 (IL-3) in vitro. IL-3 was measured by its property of supporting the growth of four different clones known to grow only in IL-3. None of the agents indicated above nor several other types of stimuli tested could induce the cells to secrete IL-3 activity. IL-3 activity from induced cells of either tissue was detected after 24 hr of culture, peaked at 48 hr and either declined by 72-96 hr of culture (bone marrow cells) or remained relatively constant through the 4-day culture period (splenocytes). The cells participating in the production of IL-3 activity in Nu/Nu spleen were THY1+, L3T4-, LyT2-, B-220-, J11d-, Ia-, and those in the marrow from either normal or Nu/Nu mice were THY1+, J11d+, L3T4-, LyT2-, B-220-, Ia-. Finally, we present evidence that Ia-positive cells negatively regulate the production of IL-3 activity by both splenocytes and marrow cells. We conclude that Nu/Nu splenocytes and bone marrow cells from both normal and Nu/Nu mice can secrete IL-3 activity after proper stimulation in vitro and that such property is negatively regulated by Ia-positive cells.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000187:drug effects / Q000378:metabolism; D001854:Bone Marrow Cells; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology; D004987:Ethers / Q000494:pharmacology; D005260:Female; D066298:In Vitro Techniques; D007377:Interleukin-3 / Q000378:metabolism*; D015759:Ionomycin; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D010835:Phytohemagglutinins / Q000494:pharmacology; D013154:Spleen / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D013234:Stem Cells / Q000187:drug effects / Q000378:metabolism; D013601:T-Lymphocytes / Q000502:physiology*
chemical_list: D004987:Ethers; D007377:Interleukin-3; D010835:Phytohemagglutinins; D003208:Concanavalin A; D015759:Ionomycin