ArticleEuropean journal of medical research2025
Retinoic acid-related orphan nuclear receptor alpha inhibits adipogenic differentiation of bone marrow mesenchymal stem cells via activating WNT/β-catenin signaling pathway.
Article in European journal of medical research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe balance between adipogenic and osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs) is essential for maintaining bone homeostasis. This study aimed to investigate the role of retinoid-related orphan receptor α (RORα) in the adipogenic differentiation of BMSCs.
methodsStable BMSC lines with RORα overexpression or knockdown were established. Adipogenic differentiation was evaluated using Oil Red O staining and by measuring the expression of adipogenic markers, including PPARγ2, LPL, LEP, FABP4, and ADIPOQ.
resultsTreatment with the RORα inhibitor SR3335 significantly promoted adipogenic differentiation, whereas the RORα agonist SR1078 exerted the opposite effect. Similarly, RORα-overexpressing (OE-RORα) BMSCs showed reduced adipogenic differentiation, while RORα knockdown BMSCs exhibited enhanced differentiation at 14 days after induction. During adipogenesis, PPARγ2 expression increased significantly, peaking at day 6 before gradually declining. Overexpression and knockdown of RORα accentuated this downregulation and upregulation, respectively, at days 6 and 12. The adipogenic marker genes lipoprotein lipase (LPL), leptin (LEP), fatty acid binding protein 4 (FABP4), and adiponectin C1Q and collagen domain containing (ADIPOQ) were markedly downregulated in RORα-overexpressing BMSCs at day 12. Moreover, RORα overexpression enhanced β-catenin nuclear translocation at day 1 post-induction and upregulated downstream WNT/β-catenin signaling molecules (Axin2, c-Myc, CD44) at day 6. Inhibition of WNT/β-catenin signaling with XAV-939 effectively reversed the suppressive effect of RORα overexpression on adipogenic differentiation and restored the expression of adipogenesis-related genes.
conclusionRORα suppresses adipogenic differentiation of BMSCs, at least in part, by activating WNT/β-catenin signaling.
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