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过氧化物酶体增殖物激活受体α对小鼠急性肝衰竭的作用与机制 被引量:3

Roles of peroxisome proliferator-activated receptor-αin acute liver failure and its pathogenetic mechanism in mice
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摘要 目的:探讨过氧化物酶体增殖物激活受体α( PPARα)对D-氨基半乳糖( D-GalN)联合脂多糖诱导的小鼠急性肝衰竭(ALF)的作用与机制。方法将C57BL/6小鼠按随机数字表法随机分为对照组、ALF组、WY14643组、3-MA+WY14643组、对照小干扰RNA( siRNA)+WY14643组、自噬相关基因ATG7 siRNA(siAtg7)+WY14643组,每组8只。通过腹腔注射溶于生理盐水中的D-GalN (700 mg/kg)联合脂多糖(10μg/kg)构建小鼠ALF模型。 WY14643作为PPARα的选择性激动剂于造模前2 h以6 mg/kg通过尾静脉注射;3-MA作为自噬抑制剂于造模前2 h以10 mg/kg通过尾静脉注射;siAtg7作为自噬抑制剂于造模前48 h以50μmol· L^-1· kg^-1过尾静脉注射;对照siRNA于造模前48 h以50μmol· L^-1· kg^-1过尾静脉注射。在D-GalN联合脂多糖注射造模后6 h麻醉小鼠取血,获取肝组织并迅速提取mRNA。组织病理学分析及血清转氨酶活性测定观察肝组织损伤的严重程度;实时定量PCR检测自噬相关基因ATG5、ATG7、溶酶体相关膜蛋白1(LAMP1)及肿瘤坏死因子( TNF)-α、白细胞介素( IL)-1β、IL-6、趋化因子配体( CXCL)-1、CXCL-10的mRNA表达;蛋白质印迹检测自噬相关蛋白LC3、ATG5、ATG7、LAMP1的表达。结果与ALF组相比,WY14643组小鼠肝小叶结构较完整,部分肝细胞呈气球样变,小叶内及汇管区炎细胞浸润不明显,血清丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)水平较低[(486±56)比(2705±423) U/L,(795±115)比(3709±820)U/L,均P<0.05],自噬相关基因LAMP1和蛋白表达更高(mRNA:4.28±0.57比2.67±0.43,P<0.05);与WY14643组相比,3-MA+WY14643组和siAtg7+WY14643组肝细胞呈大片状坏死,肝索解离,肝小叶结构无法辨认,汇管区及坏死区可见大量中性粒细胞和淋巴细胞等炎细胞浸润,血清ALT、AST水平更高[(2563±576)、(2148±221)U/L和(3474±858)、(3305±632)U/L,均P<0.05],促炎性细胞因子TNF-α、IL-1β、IL-6及趋化因子CXCL-1、CXCL-10的mRNA表达更多(均P<0.05)。结论 PPAR α可通过促进细胞自噬减轻炎症反应对D-GalN联合脂多糖诱导的小鼠ALF产生保护作用,PPAR α可能成为临床上防治ALF的一个新的、重要的靶点。 Objective To explore the protective effects of peroxisome proliferator-activated receptor-α( PPAR α) in D-GalN/LPS-induced acute liver failure ( ALF ) and its pathogenetic mechanism.Methods C57BL/6 mice were randomly divided into control ,ALF,WY14643,3-MA+WY14643,siAtg7 +WY14643 and control siRNA +WY14643 groups ( n =8 each ) .For inducing ALF , the mice were injected intraperitoneally with D-GalN ( 700 mg/kg ) and LPS ( 10 μg/kg ).The selective activator of PPAR α-WY14643 (6 mg/kg) and autophagy inhibitor 3-MA (10 mg/kg) were administered via tail vein at 2 hours prior to D-GalN/LPS exposure.The autophagy inhibitor siAtg7 (50 μmol· L-1 · kg -1 ) and control siRNA (50 μmol· L-1 · kg-1 ) were dosed via tail vein at 48 hours prior to D-GalN/LPS exposure.At 6 hours afterD-GalN/LPS dosing, the mice were anesthetized and blood sample collected.Liver samples were freshly harvested for preparing mRNA.Liver histology and serum levels of aminotransferase ( ALT ) , aspartate aminotransferase (AST) were measured as markers of hepatic damage.Autophagy related genes (ATG5, ATG7,LAMP1),inflammatory cytokines (TNF-α,IL-1β,IL-6) and chemokines (CXCL-1,CXCL-10) were detected by real-time quantitative PCR.Differential protein expressions of LC3, ATG5, ATG7, LAMP1 in autophagy pathways were detected by Western blotting.Results Compared with the model group , the hepatic architecture of WY 14643-treated mice was better preserved.And the serum levels of ALT and AST were significantly lower ((486 ±56)vs(2 705 ±423)U/L,(795 ±115)vs(3 709 ±820)U/L,both P<0.05) while the expression of autophagy related gene LAMP 1 and protein levels were significantly higher (mRNA:4.28 ±0.57 vs 2.67 ±0.43,P <0.05).As compared with WY14643-treated ALF,the mice receiving 3-MA or ATG7-specific siRNA suffered severe acute liver failure again as evidenced by worse preserved hepatic architecture,significantly higher levels of ALT and AST ((2 563 ±576),(2 148 ±221) U/L and (3 474 ±858),(3 305 ±632) U/L,all P<0.05)and mRNA levels of proinflammatory cytokines and chemokines ( all P<0.05 ).Conclusions PPARα-mediated induction of autophagy ameliorates liver injury in ALF by attenuating inflammatory responses.Thus it may become a potential target for ALF treatment.
出处 《中华医学杂志》 CAS CSCD 北大核心 2014年第26期2059-2063,共5页 National Medical Journal of China
关键词 过氧化物酶体增殖物激活受体 肝功能衰竭 急性 自噬 炎症 Peroxisome proliferator-activated receptors Liver failure,acute Autophagy Inflammation
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参考文献22

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同被引文献24

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