青蒿琥酯通过调控铁死亡信号通路缓解肝纤维化。

Artesunate alleviates liver fibrosis by regulating ferroptosis signaling pathway.

机构信息

Yancheng Matermity and Child Health Care Hospital, Yancheng, Jiangsu, 224000, China.

Yancheng Matermity and Child Health Care Hospital, Yancheng, Jiangsu, 224000, China.

出版信息

Biomed Pharmacother. 2019 Jan;109:2043-2053. doi: 10.1016/j.biopha.2018.11.030. Epub 2018 Nov 26.

Abstract

Liver fibrosis is a progression of chronic liver disease, which lacks effective therapies in the world. Attractively, more and more evidences show that natural products are safe and effective in the prevention and treatment of hepatic fibrosis. Artesunate, a water-soluble hemisuccinate derivative of artemisinin, exerts various pharmacological activities such as anti-inflammatory, anti-tumor and immunomodulating abilities. However, the effects of artesunate on hepatic fibrosis are little-known. Here our study was performed to investigate the effect of artesunate on carbon tetrachloride (CCl)-induced mouse liver fibrosis and elucidate whether artesunate could alleviate liver fibrosis by regulating ferritinophagy- mediated ferroptosis in hepatic stellate cells (HSCs). Firstly, our results demonstrated that artesunate treatment could induce activated HSC ferroptosis in fibrotic livers. Moreover, primary HSCs isolated from different animal groups were cultured to detect biomarkers of ferroptosis including iron, lipid peroxidation, glutathione (GSH) and prostaglandin endoperoxide synthase 2 (ptgs2) levels. The results revealed that artesunate remarkably promoted ferroptosis of activated HSCs. Furthermore, consistent with the experimental results in vivo, the data in vitro still indicated that artesunate treatment markedly induced ferroptosis in activated HSCs, which mainly embodied as declined cell vitality, increased cell death rate, accumulated iron, elevated lipid peroxides and reduced antioxidant capacity. Conversely, inhibition of ferroptosis by deferoxamine (DFO) completely abolished artesunate-induced anti-fibrosis effect. Surprisingly, artesunate also evidently triggered ferritinophagy accompanied by up-regulation of LC3 (microtubule-associated protein light chain 3), Atg3, Atg5, Atg6/beclin1, Atg12 (autophagy related genes) and down-regulation of p62, FTH1 (ferritin heavy chain), NCOA4 (nuclear receptor co-activator 4) in activated HSCs. Nevertheless, depletion of ferritinophagy by specific inhibitor lysosomal lumen alkalizer-chloroquine (CQ) inhibited artesunate-induced ferroptosis and anti-fibrosis function. These results suggested that ferritinophagy-mediated HSC ferroptosis was responsible for artesunate-induced anti-fibrosis efficacy, which provided new clues for further pharmacological study of artesunate.

摘要

肝纤维化是一种慢性肝病的进展,目前全球缺乏有效的治疗方法。引人注目的是,越来越多的证据表明,天然产物在预防和治疗肝纤维化方面安全有效。青蒿琥酯是青蒿素的水溶性丁二酸半酯衍生物,具有抗炎、抗肿瘤和免疫调节等多种药理作用。然而,青蒿琥酯对肝纤维化的作用知之甚少。在这里,我们研究了青蒿琥酯对四氯化碳(CCl)诱导的小鼠肝纤维化的影响,并阐明青蒿琥酯是否可以通过调节肝星状细胞(HSCs)中的铁蛋白自噬介导的铁死亡来减轻肝纤维化。首先,我们的结果表明,青蒿琥酯治疗可诱导纤维化肝脏中活化的 HSC 铁死亡。此外,从不同动物组分离的原代 HSCs 进行培养,以检测铁死亡的生物标志物,包括铁、脂质过氧化、谷胱甘肽(GSH)和前列腺素内过氧化物合酶 2(ptgs2)水平。结果表明,青蒿琥酯显著促进了活化的 HSCs 的铁死亡。此外,与体内实验结果一致,体外数据仍表明,青蒿琥酯处理可显著诱导活化的 HSCs 发生铁死亡,主要表现为细胞活力下降、细胞死亡率增加、铁积累、脂质过氧化物增加和抗氧化能力降低。相反,用去铁胺(DFO)抑制铁死亡完全消除了青蒿琥酯诱导的抗纤维化作用。令人惊讶的是,青蒿琥酯还明显触发了铁蛋白自噬,同时上调了 LC3(微管相关蛋白轻链 3)、Atg3、Atg5、Atg6/beclin1、Atg12(自噬相关基因),下调了 p62、FTH1(铁蛋白重链)、NCOA4(核受体共激活因子 4)在活化的 HSCs 中。然而,用特异性抑制剂溶酶体腔碱化剂氯喹(CQ)耗尽铁蛋白自噬抑制了青蒿琥酯诱导的铁死亡和抗纤维化功能。这些结果表明,铁蛋白自噬介导的 HSC 铁死亡是青蒿琥酯诱导的抗纤维化疗效的原因,为进一步研究青蒿琥酯的药理学提供了新的线索。

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