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CircPOMT1 and circMCM3AP inhibit osteogenic differentiation of human adipose-derived stem cells by targeting miR-6881-3p.

Circular RNAs (circRNAs), novel endogenous non-coding RNAs with the special circular structure, have been found to play critical roles in various development of tissues and diseases. However, few studies have focused on the functions and mechanisms of circRNAs in the osteogenesis of human adipose-derived stem cells (hASCs). Here, we performed the circRNAs sequencing and bioinformatic analysis to investigate the expression profiles of hASCs during osteogenic differentiation. There were 150 upregulated circRNAs and 60 downregulated circRNAs expressed differentially. Among them, the expression of circPOMT1 and circMCM3AP were downregulated during the osteogenesis of hASCs. hsa-miR-6881-3p could promote the osteogenic differentiation of hASCs, while the expression of circPOMT1 and circMCM3AP were negatively correlated with it. Smad6 and Chordin, critical inhibitors of the BMPs signaling pathway, were predicted to be the targets of hsa-miR-6881-3p. Therefore, circPOMT1 and circMCM3AP might influence the osteogenic differentiation of hASCs by targeting hsa-miR-6881-3p via BMPs signaling pathway. CircPOMT1 and circMCM3AP are potential novel targets for the repairment of bone defects.