牛磺去氧胆酸
法尼甾体X受体
西妥因1
肝损伤
免疫印迹
化学
细胞凋亡
下调和上调
标记法
锡尔图因
肝细胞
内分泌学
内科学
药理学
体外
医学
生物化学
未折叠蛋白反应
核受体
乙酰化
转录因子
基因
作者
Silei Sun,Bing Zhao,Mengzhi Qi,Yi Yao,Lili Xu,Ran Ji,Weiwei Chen,Jinlong Wang,Saijun Huang,Li Ma,Ying Chen,Zhitao Yang,Sheng Hu,Jian Fei,Erzhen Chen,Enqiang Mao
出处
期刊:Shock
[Ovid Technologies (Wolters Kluwer)]
日期:2020-02-01
卷期号:53 (2): 217-222
被引量:17
标识
DOI:10.1097/shk.0000000000001351
摘要
ABSTRACT Objective: The aim of this study was to investigate the changes of bile acids in the liver during hemorrhagic shock (HS) and their potential to attenuate liver injury via activation of SIRT1 (sirtuin 1) – FXR (farnesoid X receptor) signaling. Methods: A Sprague – Dawley (SD) rat HS model was established, whereas HepG2 cells were hypoxically cultured to simulate HS in vitro . Liver bile acids (BA) were profiled with ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). FXR expression was detected by western blot and immunohistochemistry. The mRNA levels of SIRT1 and FXR were detected by polymerase chain reaction. Protein expression of SIRT1, FoxM1, NF-κB, acetyl-NF-κB, p53, and acetyl-p53 was analyzed by western blot. Hepatocyte apoptosis and proliferation were measured by TUNEL assay and Ki-67 staining, respectively. Serum and supernatant cytokines were analyzed using ELISA assays. Liver injury was also assessed. To investigate the possible mechanisms, SIRT1 agonist (SRT1720), SIRT1 inhibitor (EX527), and FXR inhibitor (Z-guggulsterone) were used. Results: Tauroursodeoxycholic acid (TUDCA) in the liver decreased significantly after HS. SIRT1 and FXR expression was time-dependently downregulated by HS or hypoxia condition. TUDCA upregulated SIRT1 – FXR activity, which inhibited expression and acetylation of NF-κB and p53 and increased FoxM1 expression, leading to decreased inflammatory response and apoptosis and increased proliferative capacity in hepatocytes, and attenuation of liver injury. EX527 pretreatment reversed the protective effect of TUDCA. Moreover, Z-guggulsterone supplementation decreased the protective effect of TUDCA in vitro . Conclusion: TUDCA in the liver decreased during HS. TUDCA supplementation might attenuate HS-induced liver injury by upregulating SIRT1–FXR signaling.
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