title: Effect of 1 alpha,25-dihydroxyvitamin D3 on proliferation of activated T-cells and established human lymphotropic virus type I-positive T-cell lines.
abstract: The effects of 1 alpha, 25-dihydroxyvitamin D3 [1,25-(OH)2D3] on proliferation and de novo DNA synthesis were studied in the following established human leukemia cell lines: lymphoblastic T-cell lines HPB-ALL, CCRF-HSB-2, p12/lchikawa, and HPB-MLT; adult T-cell leukemia- (ATL) and human lymphotropic virus type I (HTLV-I)-infected T-cell lines HUT102, HUT-102B2, MT-1, MT-2, MJ, C2/MJ, KH-2, KH-2Lo, HPB-CTL-1, and ATN-C1; ATL-derived B-cell lines ATL-BK9 and ATL-BK10; lymphoblastic B-cell line Daudi; and myelocytic-monocytic lineage cell lines HL-60 and U937. 1,25(OH)2D3 inhibited proliferation and de novo DNA synthesis of phytohemagglutinin-P-activated T-cells and certain established HTLV-I-positive T-cells. However, it did not inhibit immature lymphoblastic T- and B-cells or ATL-derived B-cells. The degree of inhibition depended on the dose of 1,25(OH)2D3 and the heterogeneity of the established HTLV-I-positive T-cells. KH-2 and subclone KH-2Lo were markedly inhibited, and HPB-CTL-1 was moderately inhibited. Marked inhibition of DNA synthesis in KH-2Lo cells was observed in the proliferative phase of the cell cycle. No inhibition of KH-2Lo proliferation or expression of interleukin-2 and transferrin receptor was noted after removal of 1,25(OH)2D3 from the culture medium. 1,25(OH)2D3 inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced multinucleated cell formation of various HTLV-I-positive T-cell lines and TPA-induced HTLV-I p19 expression in KH-2Lo cells.
mesh_terms: D000956:Antigens, Viral / Q000032:analysis; D002117:Calcitriol / Q000494:pharmacology*; D002460:Cell Line; D004273:DNA, Neoplasm / Q000096:biosynthesis; D006800:Deltaretrovirus Infections / Q000276:immunology*; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry; D006801:Humans; D007938:Leukemia / Q000276:immunology*; D008213:Lymphocyte Activation / Q000187:drug effects*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; D004273:DNA, Neoplasm; D002117:Calcitriol