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Farnesoid X receptor protects against kidney injury in uninephrectomized obese mice

機譯:Farnesoid X受體可保護未切除直腸的肥胖小鼠免受腎臟損傷

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摘要

Activation of the farnesoid X receptor (FXR) has indicated a therapeutic potential for this nuclear bile acid receptor in the prevention of diabetic nephropathy and obesity-induced renal damage. Here, we investigated the protective role of FXR against kidney damage induced by obesity in mice that had undergone uninephrectomy, a model resembling the clinical situation of kidney donation by obese individuals. Mice fed a high-fat diet developed the core features of metabolic syndrome, with subsequent renal lipid accumulation and renal injury, including glomerulosclerosis, interstitial fibrosis, and albuminuria. The effects were accentuated by uninephrectomy. In human renal biopsies, staining of 4-hydroxynonenal (4-HNE), glucose-regulated protein 78 (GRP78) and C/EBP-homologous protein (CHOP), markers of ER stress, was more prominent in the proximal tubules of 15 obese compared with 16 non-obese patients. In mice treated with the FXR agonist obeticholic acid (OCA), renal injury, renal lipid accumulation, apoptosis and changes in lipid peroxidation were attenuated. Moreover, disturbed mitochondrial function was ameliorated and the mitochondrial respiratory chain recovered following OCA treatment. Culturing renal proximal tubular cells with free fatty acid (FFA) and FXR agonists showed that FXR activation protected cells from FFA-induced oxidative stress and ER stress, as denoted by a reduction in the level of ROS staining and Grp78 immunostaining, respectively. Several genes involved in glutathione metabolism were induced by FXR activation in the remnant kidney, which was consistent with a decreased glutathione disulfide / glutathione ratio. In summary, FXR activation maintains endogenous glutathione homeostasis and protects the kidney in uninephrectomized mice from obesity-induced injury.
機譯:法尼醇X受體(FXR)的激活表明該核膽汁酸受體在預(yù)防糖尿病性腎病和肥胖引起的腎臟損害方面具有治療潛力。在這里,我們研究了FXR對肥胖的小鼠的腎臟保護作用,該小鼠已進行了單腎切除術(shù),該模型類似于肥胖個體捐贈腎臟的臨床情況。飼喂高脂飲食的小鼠出現(xiàn)了代謝綜合征的核心特征,隨后出現(xiàn)了腎脂質(zhì)積聚和腎損傷,包括腎小球硬化,間質(zhì)纖維化和蛋白尿。腎切除術(shù)加重了這種作用。在人類腎臟活檢中,在15例肥胖的近端腎小管中,4-羥壬烯醛(4-HNE),葡萄糖調(diào)節(jié)蛋白78(GRP78)和C / EBP同源蛋白(CHOP)(ER應(yīng)激的標志物)的染色更為突出。與16位非肥胖患者相比。在用FXR激動劑奧貝膽酸(OCA)治療的小鼠中,腎損傷,腎脂質(zhì)蓄積,細胞凋亡和脂質(zhì)過氧化作用的改變被減弱。此外,OCA處理后,線粒體功能紊亂得到改善,線粒體呼吸鏈得以恢復(fù)。用游離脂肪酸(FFA)和FXR激動劑培養(yǎng)腎近端腎小管細胞表明,F(xiàn)XR激活可保護細胞免受FFA誘導的氧化應(yīng)激和ER應(yīng)激的影響,這分別表示為ROS染色水平降低和Grp78免疫染色降低。殘余腎臟中的FXR激活誘導了一些與谷胱甘肽代謝有關(guān)的基因,這與降低的谷胱甘肽二硫鍵/谷胱甘肽比例一致??偠灾?,F(xiàn)XR激活可維持內(nèi)源性谷胱甘肽穩(wěn)態(tài),并保護未切除直腸的小鼠免受肥胖引起的傷害。

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