Role of Wnt5a in modulation of osteoporotic adipose-derived stem cells and osteogenesis

Abstract

Osteoporosis, a condition marked by the deterioration of bone microarchitecture and increased facture risk, arises from a disruption in bone metabolism, with osteoclasts surpassing osteoblasts in bone resorption versus formation. The Wnt signalling pathway, a key regulator of bone maintenance, remains partially understood in osteoporosis. Our research delves into the role of Wnt-related molecules in this disease. In osteoporotic adipose-derived stem cells (OP-ASCs), we detected a significant decrease in Ctnnb1 and Frizzled-6 (Fzd6), contrasted by an increase in Gsk-3β and Wnt5a. Activation of the Wnt pathway by LiCl resulted in elevated Ctnnb1 and Fzd6, but decreased Gsk-3β and Wnt5a levels, promoting OP-ASCs’ bone-formation capacity. In contrast, inhibition of this pathway by DKK-1 led to diminished Ctnnb1 and Fzd6, and increased Gsk-3β and Wnt5a, adversely affecting osteogenesis. Furthermore, our findings show that overexpressing Wnt5a impedes, while silencing it enhances the bone-forming capability of OP-ASCs. In a cranial bone defect model, the implantation of Wnt5a-silenced OP-ASCs with biphasic calcium phosphate scaffolds significantly promoted new bone formation. These observations indicated a repression of the canonical Wnt pathway and a stimulation of the non-canonical pathway in OP-ASCs. Silencing Wnt5a increased the osteogenic and regenerative abilities of OP-ASCs. Our study suggests targeting Wnt5a could be a promising strategy for enhancing bone regeneration in post-menopausal osteoporosis.

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RIGHTS & PERMISSIONS

2024 The Author(s). Cell Proliferation published by Beijing Institute for Stem Cell and Regenerative Medicine and John Wiley & Sons Ltd.