title: Differentiation of a human monocytic cell line by 1,25-dihydroxyvitamin D3 (calcitriol): a morphologic, phenotypic, and functional analysis.
abstract: Several recent studies have suggested a role for 1,25-dihydroxyvitamin D3 (calcitriol) in myeloid differentiation. We have examined the effects of calcitriol on the U937 monoblast cell line and found that calcitriol, at near physiologic concentrations, is a potent inhibitor of U937 growth. Moreover, calcitriol induces differentiation to a monocyte-macrophage phenotype marked by enhanced alpha-naphthyl esterase staining. Morphologic changes were attended by de novo induction of the myeloid specific antigen detected by the monoclonal antibody AML-2-23, as well as dramatic increases in Fc receptors for IgG. In addition, calcitriol induced U937 cells to perform phagocytosis and antibody-dependent cellular cytotoxicity. These results indicate the potential activity of calcitriol in myeloid differentiation and additionally suggest a role for calcitriol in monocyte-macrophage activation.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D000920:Antibody-Dependent Cell Cytotoxicity; D002117:Calcitriol / Q000276:immunology / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects*; D002460:Cell Line; D006131:Growth Inhibitors; D006801:Humans; D008262:Macrophage Activation / Q000187:drug effects; D009000:Monocytes / Q000187:drug effects; D010587:Phagocytosis; D010641:Phenotype; D012397:Rosette Formation
chemical_list: D000911:Antibodies, Monoclonal; D006131:Growth Inhibitors; D002117:Calcitriol