title: 1 alpha, 25-dihydroxyvitamin D3 enhances the up-regulation of interleukin-2 receptor (p55) by interleukin-2.
abstract: The effect of 1 alpha, 25-dihydroxyvitamin D3 (1 alpha, 25(OH)2D3) on the expression of interleukin-2 (IL-2) receptor in activated T lymphocytes was examined. 1 alpha, 25(OH)2D3 enhanced the expression of IL-2 receptor (p55, Tac peptide) in phytohemagglutinin (PHA)-stimulated (3 days) human peripheral blood mononuclear cells (PBM) only in the presence of IL-2 without affecting the proliferation of the cells. This enhancement was dependent on the concentration of both IL-2 (0-1 U/ml) and 1 alpha, 25(OH)2D3(0-10(-7)M). The addition of interleukin-1 (IL-1, 0-100 U/ml), did not enhance the expression of IL-2 receptor in these cells in the presence of IL-2. Moreover, 1 alpha, 25(OH)2D3 had the same effect on two cell lines, Kit225 (an IL-2 dependent cell line established from a patient with T cell chronic lymphocytic leukemia) and YT (an IL-2 independent natural killer (NK)-like cell line from a patient with acute lymphocytic leukemia). Thus, 1 alpha, 25(OH)2D3 enhances the up-regulation of IL-2 receptor (p55) by IL-2 not only in activated T cells but also in the NK-like cell line.
authors.forename: S
authors.initials: S
authors.lastname: Tamori
authors.forename: T
authors.initials: T
authors.lastname: Uchiyama
authors.forename: H
authors.initials: H
authors.lastname: Uchino
mesh_terms: D002117:Calcitriol / Q000494:pharmacology*; D002478:Cells, Cultured; D006801:Humans; D007376:Interleukin-2 / Q000502:physiology*; D015375:Receptors, Interleukin-2 / Q000187:drug effects* / Q000502:physiology; D014407:Tumor Cells, Cultured; D015854:Up-Regulation / Q000187:drug effects*
chemical_list: D007376:Interleukin-2; D015375:Receptors, Interleukin-2; D002117:Calcitriol