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Selective Inhibition of Hepatic Stellate Cell and Fibroblast-derived LOXL1 Attenuates BDL and Mdr2-/- Induced Cholestatic Liver Fibrosis

肝星状细胞 纤维化 成纤维细胞 胆汁淤积 肝纤维化 生物 癌症研究 炎症 肝损伤 病理 免疫学 医学 体外 内分泌学 生物化学
作者
Xuzhen Yan,Ning Zhang,Luyang Wei,Wen Zhang,Tao Huang,Weiyu Li,Wei Chen,Aiting Yang,Hong You
出处
期刊:American Journal of Physiology-gastrointestinal and Liver Physiology [American Physiological Society]
标识
DOI:10.1152/ajpgi.00004.2023
摘要

Background and aims: Lysyl oxidase-like 1 (LOXL1) proteins are amine oxidases that play a crucial role in extracellular matrix remodeling due to their collagen cross-linking and intracellular functions. The role of LOXL1 in cholestatic liver fibrosis remains unexplored. Methods: We measured LOXL1 expression in two murine models of cholestasis (Mdr2 knockout [Mdr2 -/- ] and bile duct ligation [BDL]). We used adeno-associated virus (AAV) serotype 6-mediated hepatic delivery against LOXL1 (AAV2/6-shLoxl1) to investigate the therapeutic efficacy of targeting LOXL1 in cholestatic liver fibrosis. NIH-3T3 murine fibroblasts were used to investigate the function and regulatory mechanisms of LOXL1 in vitro. Results: LOXL1 expression was significantly upregulated in Mdr2 -/- and BDL mice compared to their corresponding controls, predominantly in collagen-rich fibrous septa and portal areas. AAV2/6-shLoxl1 significantly reduced LOXL1 levels in Mdr2 -/- and BDL mice, mainly located in desmin-positive hepatic stellate cells (HSCs) and fibroblasts. Concomitant with reduced LOXL1 expression, there was reduced ductular reaction, inflammation, and fibrosis in both Mdr2 -/- and BLD mouse models. Additionally, Loxl1 intervention decreased Ki-67 positive cells in the desmin-positive areas in both Mdr2 -/- and BDL mice. Overexpression of LOXL1 significantly promoted fibroblast proliferation by activating the platelet-derived growth factor receptor and extracellular signal-regulated kinase signaling pathways in vitro. Conclusion: Our findings demonstrated that selective inhibition of LOXL1 derived from HSCs/fibroblasts attenuated cholestatic liver/biliary fibrosis, inflammation, ductal reaction, and HSC/fibroblast proliferation. Based on our findings LOXL1 could be a potential therapeutic target for cholestatic fibrosis.
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