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Quercetin rescued TNF-alpha-induced impairments in bone marrow-derived mesenchymal stem cell osteogenesis and improved osteoporosis in rats.

To investigate the effect of quercetin on promoting the proliferation of bone marrow mesenchymal stem cells (BMSCs) and improving osteoporosis in rats. Rats were randomly divided into the sham, OVX and quercetin+OVX groups. In the sham and OVX groups, rats were given carboxymethyl cellulose sodium (CMC-Na). In the quercetin+OVX group, rats were given quercetin (50 mg/kg) once a day. Eight weeks after rats were treated, femurs were subjected to micro-CT scans, and bone biomechanical properties were analysed by the three-point flexural test. In addition, BMSCs were isolated and characterised by MTT, RT-PCR and Western blot analysis. In vivo, quercetin increased bone mineral density (BMD) and improved bone biomechanical properties in postmenopausal osteoporosis rat models. In vitro, TNF-α led to the activation of nuclear factor-kappa B (NF-κB) and the degradation of β-catenin, which were significantly inhibited by quercetin. Furthermore, quercetin promoted BMSC proliferation and osteogenic differentiation. In conclusion, quercetin improved in vitro models of osteoporosis and protected against TNF-α-induced impairments in BMSC osteogenesis.

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