胆固醇
新陈代谢
化学
成骨细胞
内科学
细胞生物学
生物化学
内分泌学
生物
医学
体外
作者
Shijiang Huang,Yufei Jiang,Jingyuan Li,Limin Mao,Zeyou Qiu,Sheng Zhang,Yiran Jiang,Yong Liu,Wen Liu,Zhi Xiong,Wuju Zhang,Xiaolin Liu,Yue Zhang,Xiaochun Bai,Bingbing Guo
标识
DOI:10.1002/advs.202307818
摘要
Abstract Hypercholesterolaemia is a systemic metabolic disease, but the role of organs other than liver in cholesterol metabolism is unappreciated. The phenotypic characterization of the Tsc1 Dmp1 mice reveal that genetic depletion of tuberous sclerosis complex 1 (TSC1) in osteocytes/osteoblasts ( Dmp1 ‐ Cre ) triggers progressive increase in serum cholesterol level. The resulting cholesterol metabolic dysregulation is shown to be associated with upregulation and elevation of serum amyloid A3 (SAA3), a lipid metabolism related factor, in the bone and serum respectively. SAA3, elicited from the bone, bound to toll‐like receptor 4 (TLR4) on hepatocytes to phosphorylate c‐Jun, and caused impeded conversion of cholesterol to bile acids via suppression on cholesterol 7 α‐hydroxylase ( Cyp7a1 ) expression. Ablation of Saa3 in Tsc1 Dmp1 mice prevented the CYP7A1 reduction in liver and cholesterol elevation in serum. These results expand the understanding of bone function and hepatic regulation of cholesterol metabolism and uncover a potential therapeutic use of pharmacological modulation of SAA3 in hypercholesterolaemia.
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