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铁死亡促进肝星状细胞活化和肝纤维化。

Ferroptosis contribute to hepatic stellate cell activation and liver fibrogenesis.

机构信息

College of Pharmacy, Chosun University, Gwangju, 61452, Republic of Korea.

College of Korean Medicine, Dongshin University, Naju, Jeollanam-do, 58245, Republic of Korea.

出版信息

Free Radic Biol Med. 2022 Nov 20;193(Pt 2):620-637. doi: 10.1016/j.freeradbiomed.2022.11.011. Epub 2022 Nov 10.

Abstract

Ferroptosis is a widely known regulator of cell death in connection with the redox state as a consequence of the depletion of glutathione or accumulation of lipid peroxidation. Hepatic stellate cells (HSCs) play a pivotal role in the progression of hepatic fibrosis by increasing the production and secretion of the extracellular matrix. However, the role of ferroptosis in HSC activation and liver fibrogenesis has not been clearly elucidated. The ferroptosis inducer RAS-selective lethal 3 (RSL3) or erastin treatment in HSCs caused cell death. This effect was suppressed only after exposure to ferroptosis inhibitors. We observed induction of ferroptosis by RSL3 treatment in HSCs supported by decreased glutathione peroxidase 4, glutathione deficiency, reactive oxygen species generation, or lipid peroxidation. Interestingly, RSL3 treatment upregulated the expression of plasminogen activator inhibitor-1, a representative fibrogenic marker of HSCs. In addition, treatment with ferroptosis-inducing compounds increased c-JUN phosphorylation and activator protein 1 luciferase activity but did not alter Smad phosphorylation and Smad-binding element luciferase activity. Chronic administration of iron dextran to mice causes ferroptosis of liver in vivo. The expression of fibrosis markers, such as alpha-smooth muscle actin and plasminogen activator inhibitor-1, was increased in the livers of mice with iron accumulation. Hepatic injury accompanying liver fibrosis was observed based on the levels of alanine aminotransferase, aspartate aminotransferase, and hematoxylin and eosin staining. Furthermore, we found that both isolated primary hepatocyte and HSCs undergo ferroptosis. Consistently, cirrhotic liver tissue of patients indicated glutathione peroxidase 4 downregulation in fibrotic region. In conclusion, our results suggest that ferroptosis contribute to HSC activation and the progression of hepatic fibrosis.

摘要

铁死亡是一种广泛知晓的细胞死亡调控因子,与谷胱甘肽耗竭或脂质过氧化积累导致的氧化还原状态有关。肝星状细胞(HSCs)通过增加细胞外基质的产生和分泌,在肝纤维化进展中发挥关键作用。然而,铁死亡在 HSC 激活和肝纤维化形成中的作用尚未明确阐明。铁死亡诱导剂 RAS 选择性致死 3(RSL3)或 erastin 在 HSCs 中的处理导致细胞死亡。这种作用仅在暴露于铁死亡抑制剂后才被抑制。我们观察到 RSL3 处理在 HSCs 中诱导铁死亡,表现为谷胱甘肽过氧化物酶 4 减少、谷胱甘肽缺乏、活性氧生成或脂质过氧化。有趣的是,RSL3 处理上调了纤溶酶原激活物抑制剂-1 的表达,这是 HSCs 纤维化的代表性标志物。此外,铁死亡诱导化合物的处理增加了 c-JUN 磷酸化和激活蛋白 1 荧光素酶活性,但不改变 Smad 磷酸化和 Smad 结合元件荧光素酶活性。铁葡聚糖的慢性给予导致体内肝脏的铁死亡。在铁蓄积的小鼠肝脏中,纤维化标志物如α-平滑肌肌动蛋白和纤溶酶原激活物抑制剂-1 的表达增加。根据丙氨酸氨基转移酶、天冬氨酸氨基转移酶和苏木精和伊红染色的水平,观察到伴随肝纤维化的肝损伤。此外,我们发现分离的原代肝细胞和 HSCs 都发生了铁死亡。一致地,患者的肝硬化组织在纤维化区域显示出谷胱甘肽过氧化物酶 4 的下调。总之,我们的结果表明铁死亡有助于 HSC 激活和肝纤维化的进展。

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