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Int. J. Mol. Sci. 2016, 17(5), 770;

Downregulation of Runx2 by 1,25-Dihydroxyvitamin D3 Induces the Transdifferentiation of Osteoblasts to Adipocytes

Department of Pharmacology, Chonnam National University Medical School, Gwangju 61469, Korea
Department of Biomedical Sciences, Chonnam National University Medical School, Gwangju 61469, Korea
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Charles J. Malemud
Received: 7 March 2016 / Revised: 27 April 2016 / Accepted: 16 May 2016 / Published: 19 May 2016
(This article belongs to the Section Biochemistry, Molecular and Cellular Biology)
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1,25-Dihydroxyvitamin D3 (1,25(OH)2D3) indirectly stimulates bone formation, but little is known about its direct effect on bone formation. In this study, we observed that 1,25(OH)2D3 enhances adipocyte differentiation, but inhibits osteoblast differentiation during osteogenesis. The positive role of 1,25(OH)2D3 in adipocyte differentiation was confirmed when murine osteoblasts were cultured in adipogenic medium. Additionally, 1,25(OH)2D3 enhanced the expression of adipocyte marker genes, but inhibited the expression of osteoblast marker genes in osteoblasts. The inhibition of osteoblast differentiation and promotion of adipocyte differentiation mediated by 1,25(OH)2D3 were compensated by Runx2 overexpression. Our results suggest that 1,25(OH)2D3 induces the transdifferentiation of osteoblasts to adipocytes via Runx2 downregulation in osteoblasts. View Full-Text
Keywords: 1,25(OH)2D3; transdifferentiation; osteoblast; adipocyte 1,25(OH)2D3; transdifferentiation; osteoblast; adipocyte

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Kim, J.H.; Seong, S.; Kim, K.; Kim, I.; Jeong, B.-C.; Kim, N. Downregulation of Runx2 by 1,25-Dihydroxyvitamin D3 Induces the Transdifferentiation of Osteoblasts to Adipocytes. Int. J. Mol. Sci. 2016, 17, 770.

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