biostudies-literatureSmith SSUConn HealthNIDCR NIH HHSNational Institutes of HealthNIAMS NIH HHSAmerican Society for Bone and Mineral Research21717-21728https://www.ebi.ac.uk/biostudies/studies/S-EPMC5076840biostudies-literatureUnknown291(41)Serum glucocorticoids play a critical role in synchronizing circadian rhythm in peripheral tissues, and multiple mechanisms regulate tissue sensitivity to glucocorticoids. In the skeleton, circadian rhythm helps coordinate bone formation and resorption. Circadian rhythm is regulated through transcriptional and post-transcriptional feedback loops that include microRNAs. How microRNAs regulate circadian rhythm in bone is unexplored. We show that in mouse calvaria, miR-433 displays robust circadian rhythm, peaking just after dark. In C3H/10T1/2 cells synchronized with a pulse of dexamethasone, inhibition of miR-433 using a tough decoy altered the period and amplitude of Per2 gene expression, suggesting that miR-433 regulates rhythm. Although miR-433 does not directly target the Per2 3'-UTR, iThe Journal of biological chemistryMicroRNA-433 Dampens Glucocorticoid Receptor Signaling, Impacting Circadian Rhythm and Osteoblastic Gene Expression.PMC5076840AR0448775T90DE21989R56 AR044877R29 AR044877T90 DE021989R01 AR044877Grant-In-AidFranceschetti TDole NSSmith SSHrdlicka HCDelany AMfalseMicroRNA-433 Dampens Glucocorticoid Receptor Signaling, Impacting Circadian Rhythm and Osteoblastic Gene Expression.Serum glucocorticoids play a critical role in synchronizing circadian rhythm in peripheral tissues, and multiple mechanisms regulate tissue sensitivity to glucocorticoids. In the skeleton, circadian rhythm helps coordinate bone formation and resorption. Circadian rhythm is regulated through transcriptional and post-transcriptional feedback loops that include microRNAs. How microRNAs regulate circadian rhythm in bone is unexplored. We show that in mouse calvaria, miR-433 displays robust circadian rhythm, peaking just after dark. In C3H/10T1/2 cells synchronized with a pulse of dexamethasone, inhibition of miR-433 using a tough decoy altered the period and amplitude of Per2 gene expression, suggesting that miR-433 regulates rhythm. Although miR-433 does not directly target the Per2 3'-UTR, i2016-01-01T00:00:00Z2016 Oct2025-04-04T09:21:13.459Z2019-03-27T02:27:23ZS-EPMC50768402755104810.1074/jbc.M116.73789010.1074/jbc.m116.737890