miR-629-3p affects postmenopausal osteoporosis through targeted regulation of BACH1.

BACKGROUND: Osteoporosis (OP) represents a major global health challenge, particularly among postmenopausal women. Currently, there remains a shortage of reliable diagnostic biomarkers and targeted therapies for OP. METHODS: A cohort of 254 postmenopausal women (127 OP patients and 127 healthy controls) was analyzed. Serum miR-629-3p levels were measured via qRT-PCR, and diagnostic potential was assessed using ROC analysis. In vitro, MC3T3-E1 osteoblasts were transfected with miR-629-3p mimic/inhibitor and BACH1 overexpression vector (oe-BACH1). Proliferation and apoptosis were evaluated by functional assays (CCK-8, Annexin V-FITC/PI staining), while osteogenic markers (FN1, ITGB1 and RUNX2) were assessed by qPCR. The binding of miR-629-3p to the BACH1 3'UTR was confirmed by luciferase reporter assays. RESULTS: Our findings revealed significantly decreased miR-629-3p levels in OP patients (P < 0.001), negatively correlating with BACH1 (r = -0.696, P < 0.001) and showing diagnostic potential (AUC = 0.929). Mechanistically, miR-629-3p mimic suppressed BACH1 (P < 0.001), enhancing proliferation, reducing apoptosis, and upregulating RUNX2 (all P < 0.001), while BACH1 overexpression reversed these effects. Luciferase assays confirmed miR-629-3p directly targets BACH1 3'UTR (P < 0.001). CONCLUSION: miR-629-3p attenuates OP progression by inhibiting BACH1, thereby promoting osteoblast survival, proliferation, and differentiation. Its diagnostic potential and therapeutic role in restoring osteogenic function highlight miR-629-3p/BACH1 as a promising axis for OP management. However, the findings of this study require further validation in animal models to fully establish causality.