Bhalla A K, Williams M M, Lal S, Lydyard P M
Department of Immunology, University College and Middlesex School of Medicine, London, UK.
Clin Exp Immunol. 1989 May;76(2):274-7.
We have examined the effects of vitamin D3 metabolites and retinoic acid on the myelomonocyte cell line U937. Inhibition of proliferation, measured by incorporation of 125iodo-deoxyuridine was seen at 72 h with 1,25-(OH)2D3 but not 25(OH)D3 or 24, 25(OH)2D3 metabolites. CD14 molecules, not normally present on U937 cells, were induced on the cell surface. However, Class II major histocompatibility complex (MHC) molecules were not induced and Class I MHC molecules not increased in density as determined by flow cytometry. Retinoic acid inhibited proliferation but failed to induce CD14 molecules. These data suggest that both 1,25(OH)2D3 and retinoic acid act as an antiproliferation signal to U937 cells; only 1,25-(OH)2D3 induces the differentiation towards a more mature phenotype.
我们研究了维生素D3代谢产物和视黄酸对髓单核细胞系U937的影响。用125碘脱氧尿苷掺入法测定增殖抑制情况,结果显示在72小时时,1,25-(OH)2D3可抑制增殖,而25(OH)D3或24,25(OH)2D3代谢产物则无此作用。U937细胞表面原本不存在的CD14分子被诱导表达。然而,通过流式细胞术测定发现,II类主要组织相容性复合体(MHC)分子未被诱导,I类MHC分子的密度也未增加。视黄酸抑制增殖,但未能诱导CD14分子表达。这些数据表明,1,25(OH)2D3和视黄酸均作为U937细胞的抗增殖信号;只有1,25-(OH)2D3能诱导其向更成熟的表型分化。