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中华危重症医学杂志(电子版) ›› 2017, Vol. 10 ›› Issue (01) : 3 -8. doi: 10.3877/cma.j.issn.1674-6880.2017.01.001

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论著

过氧化物酶体增殖物激活受体α对急性肝衰竭小鼠内质网应激的影响
宋金钥1, 张向颖2, 时红波2, 陈德喜2, 段钟平2, 张桓虎1, 任锋2,()   
  1. 1. 030001 太原,山西医科大学第二医院消化科
    2. 100069 北京,首都医科大学附属北京佑安医院肝病研究所
  • 收稿日期:2016-12-07 出版日期:2017-02-01
  • 通信作者: 任锋
  • 基金资助:
    国家自然科学基金项目(81270532); 北京市自然科学基金项目(7162085); 首都特色临床应用研究项目(Z121107001012167); 北京市卫生系统高层次卫生技术人才培养计划项目(2013-3-075)

Effect of peroxisome proliferator activated receptor α on endoplasmic reticulum stress in acute liver failure mice

Jinyue Song1, Xiangying Zhang2, Hongbo Shi2, Dexi Chen2, Zhongping Duan2, Huanhu Zhang1, Feng Ren2,()   

  1. 1. Department of Gastroenterology, Second Hospital, Shanxi Medical University, Taiyuan 030001, China
    2. Institute of Liver Disease, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
  • Received:2016-12-07 Published:2017-02-01
  • Corresponding author: Feng Ren
  • About author:
    Corresponding author: Ren Feng, Email:
引用本文:

宋金钥, 张向颖, 时红波, 陈德喜, 段钟平, 张桓虎, 任锋. 过氧化物酶体增殖物激活受体α对急性肝衰竭小鼠内质网应激的影响[J/OL]. 中华危重症医学杂志(电子版), 2017, 10(01): 3-8.

Jinyue Song, Xiangying Zhang, Hongbo Shi, Dexi Chen, Zhongping Duan, Huanhu Zhang, Feng Ren. Effect of peroxisome proliferator activated receptor α on endoplasmic reticulum stress in acute liver failure mice[J/OL]. Chinese Journal of Critical Care Medicine(Electronic Edition), 2017, 10(01): 3-8.

目的

研究过氧化物酶体增殖物激活受体α(PPARα)通过调控内质网应激(ERS)在小鼠急性肝衰竭(ALF)肝损伤病理机制中的作用。

方法

腹腔注射D-氨基半乳糖(D-GalN)和脂多糖(LPS)诱导小鼠ALF模型。将小鼠分为对照组(仅给予相应量的磷酸盐缓冲液,10只)、模型组(16只)和Wy-14643干预组(造模前2 h以6 mg/kg通过尾静脉注射,16只)。同时,将模型组进一步分为给药后1、3、6 h 3个亚组,比较各亚组与对照组间内质网应激特异性凋亡蛋白CCAAT/增强子结合蛋白同源蛋白(CHOP)和PPARα表达情况。建模6 h后,检测血清丙氨酸转氨酶(ALT)、天门冬酸氨基转移酶(AST)评价肝脏功能。采用免疫印迹技术比较对照组、模型组及Wy-14643干预组间caspase-3、cleaved caspase-3、CHOP表达情况。另取13只小鼠为4-丁酸苯酯(4-PBA)干预组(建模前6 h腹腔注射给予100 mg/kg的4-PBA),比较对照组、模型组及4-PBA干预组间PPARα蛋白及mRNA表达情况。

结果

与对照组相比,随着ALF的逐渐进展,模型组给药后3、6 h CHOP表达显著升高(F = 6.341,P = 0.025),PPARα表达显著降低(F = 7.115,P = 0.022)。三组小鼠间血清ALT、AST、caspase-3、cleaved caspase-3和CHOP表达水平比较,差异均有统计学意义(F = 8.454,P = 0.027;F = 10.252,P = 0.016;F = 6.231,P = 0.042;F = 30.072,P < 0.001;F = 8.596,P = 0.014)。Wy-14643干预组血清ALT[(524 ± 330)U/L vs.(1 465 ± 485)U/L]、AST[(1 227 ± 314)U/L vs.(4 038 ± 1 537)U/L]水平均显著低于模型组(P均< 0.05),且与模型组相比,对照组与Wy-14643干预组小鼠caspase-3显著升高,cleaved caspase-3和CHOP表达显著降低(P均< 0.05)。与此同时,4-PBA干预组PPARα的mRNA和蛋白表达均显著高于模型组(F = 6.665,P = 0.017;F = 5.441,P = 0.043)。

结论

PPARα可能通过抑制严重内质网应激而保护小鼠急性肝衰竭后肝损伤。

Objective

To study the role of peroxisome proliferator activated receptor α (PPARα) on serious endoplasmic reticulum stress in acute liver failure (ALF) mice induced by D-Galactosamine/lipopolysaccharide (D-GalN/LPS).

Methods

ALF model was established by intraperitoneal injection of D-GalN/LPS in C57BL/6 mice. Animal experimental groups included the control group (corresponding volume phosphate buffered saline, 10 mice), model group (16 mice), Wy-14643 group (6 mg/kg Wy-14643 by tail vein on 2 h before model establishment).Meanwhile, mice in the model group further divided into three subgroup according to 1, 3, 6 h after D-GaN/LPS injection. The expression of C/EBP homologous protein (CHOP) and peroxisome proliferator activated receptor α (PPARα) among subgroup and the control group were compared. The levels of alanine transaminase (ALT) and aspartate aminotransferase (AST) were detected, the expression of caspase-3, cleaved caspase-3 and CHOP were examined by Western-blotting on 6 h after model establishment. The other 13 mice were injected 100 mg/kg 4-phenylbutyrate (4-PBA) on 6 h before model establishment as the 4-PBA group. The PPARα protein and mRNA were detected and compared.

Results

In the model group on 3, 6 h after D-GaN/LPS injection, the expression of CHOP increased (F = 6.341, P = 0.025), and PPARα decreased (F = 7.115, P = 0.022) as compared with those in the control group during the progression of ALF. The ALT, AST, caspase-3, cleaved caspase-3 and CHOP among the control group, model group and Wy-14643 group all showed significant differences (F = 8.454, P = 0.027; F = 10.252, P = 0.016; F = 6.231, P = 0.042; F = 30.072, P < 0.001; F = 8.596, P = 0.014). And the levels of ALT [(524 ± 330) U/L vs.(1 465 ± 485) U/L] and AST [(1 227 ± 314) U/L vs.(4 038 ± 1 537) U/L] in the Wy-14643 group were much lower than those in the model group (all P < 0.05). In the control group and Wy-14643 group, the expression of caspase-3 increased markedly, cleaved caspase-3 and CHOP decreased obviously as compared with those in the model group (all P < 0.05). Meanwhile, the PPARα mRNA and protein in the 4-PBA group were much higher than those in the model group (F = 6.665, P = 0.017; F = 5.441, P = 0.043).

Conclusion

PPARα may have the protective effects of liver function in ALF mice by inhibiting serious endoplasmic reticulum stress.

图1 对照组及模型组给药后1、3、6 h各亚组小鼠间PPARα和CHOP蛋白表达谱。注:a图为各组间CHOP蛋白表达变化;b图为各组间PPARα蛋白表达变化;c图为各组间CHOP及PPARα蛋白电泳图。CHOP:CCAAT/增强子结合蛋白同源蛋白(C/EBP homologous protein);PPARα:过氧化物酶体增殖物激活受体α(peroxisome proliferator activated receptor alpha);与对照组比较,*P < 0.05
图2 三组小鼠肝细胞病理图。注:a图为对照组;b图为模型组;c图为Wy-14643干预组,图中可见相对于对照组,模型组部分肝小叶出现结构紊乱、细胞肿胀变性、细胞凋亡及炎症细胞浸润,可见大块坏死区(苏木精-伊红染色 × 40)
表1 各实验组小鼠血清ALT、AST水平比较( ± s
图3 三组ALF小鼠肝脏组织caspase-3、cleaved caspase-3和CHOP蛋白表达的比较。注:a图为各组间caspase-3蛋白表达变化;b图为各组间cleaved caspase-3蛋白表达变化;c图为各组间CHOP蛋白表达变化;d图为三组间caspase-3、cleaved caspase-3和CHOP蛋白表达电泳图;干预组为Wy-14643干预组;CHOP:CCAAT/增强子结合蛋白同源蛋白(C/EBP homologous protein);与对照组比较,*P < 0.05;与模型组比较,#P < 0.05
图4 三组小鼠肝脏组织PPARα蛋白及mRNA表达的比较。注:a图为三组间PPARα蛋白表达的变化;b图为PPARα蛋白表达电泳图;干预组为4-丁酸苯酯干预组;PPARα:过氧化物酶体增殖物激活受体α(peroxisome proliferator activated receptor alpha);与对照组比较,*P < 0.05;与模型组比较,#P < 0.05
表2 各实验组小鼠肝脏PPARα mRNA水平比较( ± s
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