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Endocrinology, Vol 136, 5643-5650, Copyright © 1995 by Endocrine Society

ARTICLES

1,25 dihydroxyvitamin D3 stimulates differentiation of committed murine bone marrow-derived macrophage precursor cells

SL Perkins, SJ Kling, FP Ross and SL Teitelbaum
Department of Pathology, University of Utah Health Sciences, Salt Lake City 84132, USA.

1,25-Dihydroxyvitamin D3 [1,25-(OH)2D3] and macrophage colony- stimulating factor (M-CSF) both accelerate differentiation of marrow macrophages from which osteoclasts are derived. Previously, we showed that the steroid's effect on early macrophage precursors may be mediated through M-CSF, as the steroid enhances cytokine receptor expression. In contrast, 1,25-(OH)2D3 blunts M-CSF receptor expression on more mature, yet still pluripotential, hematopoietic precursors. Extending these observations to marrow cells committed to macrophage differentiation, we found that 1,25-(OH)2D3 causes a marked decrease in cellular proliferation despite a 2- to 3-fold increase in [125I]M-CSF binding in a similar dose-dependent metabolite-specific manner. Scatchard analysis demonstrated that increased binding reflects increased receptor capacity without an alteration in affinity. Steroid- induced M-CSF receptor enhancement reflects acceleration of protein appearance rather than overexpression, as treated and untreated cells ultimately exhibit equivalent binding. Increased M-CSF receptor expression is mirrored by increased c-fms messenger RNA levels, and actinomycin D or cycloheximide experiments indicate that new receptor synthesis, rather than mobilization of intracellular pools, is required. Thus, 1,25-(OH)2D3 differentially impacts on M-CSF receptor expression throughout the spectrum of bone marrow macrophage differentiation.


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