自噬
连环素
细胞生物学
炎症
Wnt信号通路
化学
蛋白激酶B
PI3K/AKT/mTOR通路
癌症研究
生物
信号转导
免疫学
细胞凋亡
生物化学
作者
Kai Hang,Yibo Wang,Jinwu Bai,Z. Wang,Weiliang Wu,WeiWei Zhu,S Liu,Zhijun Pan,JianSong Chen,Wenhao Chen
标识
DOI:10.1096/fj.202302425r
摘要
Abstract Multiple regulatory mechanisms are in place to ensure the normal processes of bone metabolism, encompassing both bone formation and absorption. This study has identified chaperone‐mediated autophagy (CMA) as a critical regulator that safeguards bone formation from the detrimental effects of excessive inflammation. By silencing LAMP2A or HSCA8, we observed a hindrance in the osteoblast differentiation of human bone marrow mesenchymal stem cells (hBMSCs) in vitro. To further elucidate the role of LAMP2A, we generated LAMP2A gene knockdown and overexpression of mouse BMSCs (mBMSCs) using adenovirus. Our results showed that LAMP2A knockdown led to a decrease in osteogenic‐specific proteins, while LAMP2A overexpression favored the osteogenesis of mBMSCs. Notably, active‐β‐catenin levels were upregulated by LAMP2A overexpression. Furthermore, we found that LAMP2A overexpression effectively protected the osteogenesis of mBMSCs from TNF‐α, through the PI3K/AKT/GSK3β/β‐catenin pathway. Additionally, LAMP2A overexpression significantly inhibited osteoclast hyperactivity induced by TNF‐α. Finally, in a murine bone defect model, we demonstrated that controlled release of LAMP2A overexpression adenovirus by alginate sodium capsule efficiently protected bone healing from inflammation, as confirmed by imaging and histological analyses. Collectively, our findings suggest that enhancing CMA has the potential to safeguard bone formation while mitigating hyperactivity in bone absorption.
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