Department of Nephrology, Molecular Cell Lab for Kidney Disease, Shanghai Peritoneal Dialysis Research Center, Ren Ji Hospital, Uremia Diagnosis and Treatment Center, Shanghai Jiao Tong University School of Medicine, Shanghai, 200127, China.
Department of Nephrology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, 201200, China.
Free Radic Biol Med. 2024 Jun;218:120-131. doi: 10.1016/j.freeradbiomed.2024.04.213. Epub 2024 Apr 5.
Sepsis-induced acute kidney injury (S-AKI) is the most common type of acute kidney injury (AKI), accompanied by elevated morbidity and mortality rates. This study investigated the mechanism by which lipid droplets (LDs) degraded via autophagy (lipophagy)required for RAB7 regulated ferroptosis in the pathogenesis of S-AKI. Here, we constructed the S-AKI model in vitro and in vivo to elucidate the potential relationship of lipophagy and ferroptosis, and we first confirmed that the activation of lipophagy promoted renal tubular epithelial cell ferroptosis and renal damage in S-AKI. The results showed that lipopolysaccharide (LPS) induced a marked increase in lipid peroxidation and ferroptosis, which were rescued by ferrstain-1 (Fer-1), an inhibitor of ferroptosis. In addition, LPS induced the remarkable activation of RAB7-mediated lipophagy. Importantly, silencing RAB7 alleviated LPS-induced lipid peroxidation and ferroptosis. Thus, the present study demonstrated the potential significant role of ferroptosis and lipophagy in sepsis-induced AKI, and contributed to better understanding of the pathogenesis and treatment targets of AKI.
脂滴(LDs)通过自噬(脂噬)降解所必需的 RAB7 调控铁死亡在脓毒症相关性急性肾损伤(S-AKI)发病机制中的作用。本研究构建了体外和体内 S-AKI 模型,以阐明脂噬和铁死亡的潜在关系,并首次证实脂噬的激活促进了 S-AKI 中肾小管上皮细胞的铁死亡和肾损伤。结果表明,脂多糖(LPS)诱导脂质过氧化和铁死亡明显增加,铁死亡抑制剂 ferrstain-1(Fer-1)可挽救这一现象。此外,LPS 诱导了 RAB7 介导的脂噬的显著激活。重要的是,沉默 RAB7 可减轻 LPS 诱导的脂质过氧化和铁死亡。因此,本研究表明铁死亡和脂噬在脓毒症相关性急性肾损伤中具有潜在的重要作用,有助于更好地理解急性肾损伤的发病机制和治疗靶点。