title: 1,25-dihydroxyvitamin D3 stimulates interleukin-2 production by a T cell lymphoma line (MLA-144) cultured in vitamin D-deficient rat serum.
abstract: A lymphocyte T cell line (MLA-144), which constitutively secretes interleukin-2 (IL-2), was shown to express receptors for 1,25-dihydroxyvitamin D3 (1,25(OH)2D3). The proliferation of an IL-2-dependent cell line (HT-2) in response to supernatants from MLA-144 cells was employed as an index of IL-2 production by MLA-144 cells. IL-2 production was two fold higher from MLA-144 cells cultured in 2% vitamin D-deficient rat serum compared to 10% fetal calf serum (FCS). The addition of 1,25(OH)2D3 at 10(-15) M or 10(-11) M augmented IL-2 production by MLA-144 cells in vitamin D-deficient rat serum, but not in fetal calf serum. At 10(-7) M 1,25(OH)2D3 there was inhibition of IL-2 production by MLA-144 cells in either vitamin D-deficient serum or FCS. There was no effect of 1,25(OH)2D3 added directly to HT-2 cells. Monoclonal antibody to the IL-2 receptor competitively inhibited the proliferation of HT-2 cells in response to MLA-144 supernatants, suggesting that it was IL-2 from the MLA-144 supernatants which influenced HT-2 proliferation. Our findings demonstrate biphasic dose effects of 1,25(OH)2D3 on lymphokine secretion. The use of vitamin D-deficient rat serum allowed us to demonstrate the effects of 1,25(OH)2D3 in the physiologic and subphysiologic range.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002117:Calcitriol / Q000494:pharmacology*; D002460:Cell Line; D002478:Cells, Cultured; D003600:Cytosol / Q000378:metabolism; D004097:Dihydrotachysterol / Q000378:metabolism; D007376:Interleukin-2 / Q000096:biosynthesis*; D051381:Rats; D018167:Receptors, Calcitriol; D011987:Receptors, Steroid / Q000378:metabolism; D013601:T-Lymphocytes / Q000378:metabolism*
chemical_list: D007376:Interleukin-2; D018167:Receptors, Calcitriol; D011987:Receptors, Steroid; D002117:Calcitriol; D004097:Dihydrotachysterol