title: Plant-derived diterpene esters enhance HTLV-I-induced colony formation of lymphocytes in co-culture.
abstract: The addition to culture dishes of 10-50 ng/ml of the essential diterpene ester of Sapium sebiferum, 12-O-hexadecanoylphorbol-13-acetate (HPA), increased colony formation of normal peripheral blood lymphocytes co-cultured with gamma-irradiated HTLV-I-producing HUT 102 cells. The cells in the stimulated colonies showed an approximately 3-fold increase in the expression of interleukin-2 (IL-2) receptors and a 1.5- to 2.0-fold increase in human T-lymphotropic virus type- I (HTLV-I) p19-positive cells. This biological potency was analogous to that induced by the most potent tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) and stronger than that of 12-O-hexadecanoyl-16-hydroxyphorbol-13-acetate (HHPA) isolated from Aleurites fordii.
mesh_terms: D002273:Carcinogens / Q000494:pharmacology*; D002472:Cell Transformation, Viral / Q000187:drug effects*; D002478:Cells, Cultured; D017977:Deltaretrovirus / Q000472:pathogenicity*; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects*; D010703:Phorbol Esters / Q000494:pharmacology*; D010835:Phytohemagglutinins / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D002273:Carcinogens; D010703:Phorbol Esters; D010835:Phytohemagglutinins; C028113:croton factor F1; D013755:Tetradecanoylphorbol Acetate