• 1 May 1987
    • journal article
    • research article
    • Vol. 47  (9) , 2236-2242
Abstract
We analyzed the combined effect of tumor necrosis factor and 1.alpha.,25-dihydroxyvitamin D3 on the differentiation of human myeloid cell lines HL-60, ML3, and U937. The two compounds synergize in inducing the morphological, phenotypic, enzymatic, and functional characteristics of cells of the monocytic lineage. Immune .gamma.-interferon synergizes with each compound to induce differentiation. However, recombinant tumor necrosis factor is much more effective than recombinant .gamma.-interferon in potentiating the effect of 1.alpha.,25-dihydroxyvitamin D3 and, alone, is also more effective than recombinant .gamma.-interferon in inducing expression of the high-affinity Fc receptor on ML3 cells. The possible physiological or pathological relevance of the synergistic effect of tumor necrosis factor and 1.alpha.,25-dihydroxyvitamin D3 on monocytic differentiation is discussed.

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