A role for 1¨,25-dihydroxyvitamin D3 in the expression of circadian genes
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© 2014 The Author(s).The active form of vitamin D, 1¿,25-(OH)2D3, has been associated with metabolism control, cell growth, differentiation, antiproliferation, apoptosis, and adaptive/innate immune responses, besides its functions in the integrity of bone and calcium homeostasis. The circadian rhythm regulates a variety of biological processes, many of them related to the functions associated with 1¿,25-(OH)2D3. In the present study, we determine whether 1¿,25-(OH)2D3 alters the expression of circadian genes in adipose-derived stem cells (ADSCs). The effect of 1¿,25-(OH)2D3 on the expression of circadian genes BMAL1 and PER2 was measured by qPCR, over a 60-h period every 4 h, in serum shocked ADSCs, serum shocked ADSCs supplemented with 1¿,25-(OH)2D3, and ADSCs under the presence of only 1¿,25-(OH)2D3. The results showed that 1¿,25-(OH)2D3 was able to synchronize circadian clock gene expression in ADSCs. The expression of circadian genes BMAL1 and PER2 in ADSCs that contained only 1¿,25-(OH)2D3 has a profile similar to that found in the ADSCs synchronized by a serum shock. The results suggest an important role of 1¿,25-(OH)2D3 in the regulation of the molecular clock.