内质网应激通过SCAP/SREBP-1c调控L02肝细胞脂质合成代谢

被引:36
作者
刘佳
李传飞
宁波
杨朝霞
机构
[1] 重庆医科大学附属第二医院消化内科
关键词
非酒精性脂肪肝; 内质网应激; SCAP; RNA干扰; SREBP-1c;
D O I
10.16016/j.1000-5404.201409035
中图分类号
R329.2 [人体细胞学];
学科分类号
100107 [人体解剖与组织胚胎学(人体解剖学、组织与胚胎学)];
摘要
目的在内质网应激状态下,观察SCAP/SREBP-1c对肝细胞脂质合成代谢的影响。方法用毒胡萝卜素(Tg)诱导人L02正常肝细胞株建立内质网应激模型,Western blot检测GRP78的蛋白表达。甘油三酯(TG)试剂盒和油红O染色检测肝细胞内脂变程度;实时荧光定量PCR检测SREBP-1c下游脂代谢相关基因FAS、ACC1的mRNA表达情况,Western blot检测n SREBP-1c、FAS、ACC1的蛋白表达情况。通过miRNA瞬时转染沉默SCAP基因的表达,观察上述指标的变化情况。结果实验组GRP78蛋白的相对表达量与对照组比较,均显著增加(P<0.05),Tg在体外成功建立肝细胞内质网应激模型。与空白对照组相比,Tg组肝细胞内甘油三酯含量明显增加(P<0.05),脂滴明显增多;n SREBP-1c的蛋白水平明显升高(P<0.05);下游靶基因FAS和ACC1的基因和蛋白水平均明显上调(P<0.05),与n SREBP-1c的升高趋势一致。转染SCAP-3 miRNA载体后,以上指标均明显下调(P<0.05)。结论内质网应激通过SCAP/SREBP-1c调控肝细胞脂质合成代谢,促进脂质沉积,是NAFLD重要的发病机制之一。靶向干扰SCAP,能减轻内质网应激所致的肝细胞脂肪变程度,成为安全有效的NAFLD防治新靶点。
引用
收藏
页码:443 / 448
页数:6
相关论文
共 13 条
[1]
Resolvin D1 reduces ER stress-induced apoptosis and triglyceride accumulation through JNK pathway in HepG2 cells [J].
Jung, Tae Woo ;
Hwang, Hwan-Jin ;
Hong, Ho Cheol ;
Choi, Hae Yoon ;
Yoo, Hye Jin ;
Baik, Sei Hyun ;
Choi, Kyung Mook .
MOLECULAR AND CELLULAR ENDOCRINOLOGY, 2014, 391 (1-2) :30-40
[2]
Endoplasmic reticulum stress leads to lipid accumulation through upregulation of SREBP-1c in normal hepatic and hepatoma cells [J].
Fang, Dian-liang ;
Wan, Ying ;
Shen, Wei ;
Cao, Jie ;
Sun, Zhong-xin ;
Yu, Hui-hong ;
Zhang, Qin ;
Cheng, Wen-hui ;
Chen, Juan ;
Ning, Bo .
MOLECULAR AND CELLULAR BIOCHEMISTRY, 2013, 381 (1-2) :127-137
[3]
SIRT7 Represses Myc Activity to Suppress ER Stress and Prevent Fatty Liver Disease.[J].Jiyung Shin;Ming He;Yufei Liu;Silvana Paredes;Lidia Villanova;Katharine Brown;Xiaolei Qiu;Noushin Nabavi;Mary Mohrin;Kathleen Wojnoonski;Patrick Li;Hwei-Ling Cheng;Andrew J. Murphy;David M. Valenzuela;Hanzhi Luo;Pankaj Kapahi;Ronald Krauss;Raul Mostoslavsky;George D. Yancopoulos;Frederick W. Alt;Katrin F. Chua;Danica Chen.Cell Reports.2013, 5
[4]
Comparison of In Vivo Effects of Insulin on SREBP-1c Activation and INSIG-1/2 in Rat Liver and Human and Rat Adipose Tissue [J].
Boden, Guenther ;
Salehi, Sajad ;
Cheung, Peter ;
Homko, Carol ;
Song, Weiwei ;
Loveland-Jones, Catherine ;
Jayarajan, Senthil .
OBESITY, 2013, 21 (06) :1208-1214
[5]
The Scap/SREBP Pathway Is Essential for Developing Diabetic Fatty Liver and Carbohydrate-Induced Hypertriglyceridemia in Animals [J].
Moon, Young-Ah ;
Liang, Guosheng ;
Xie, Xuefen ;
Frank-Kamenetsky, Maria ;
Fitzgerald, Kevin ;
Koteliansky, Victor ;
Brown, Michael S. ;
Goldstein, Joseph L. ;
Horton, Jay D. .
CELL METABOLISM, 2012, 15 (02) :240-246
[6]
Endoplasmic reticulum stress is involved in hepatic SREBP-1c activation and lipid accumulation in fructose-fed mice [J].
Zhang, Cheng ;
Chen, Xi ;
Zhu, Ren-Min ;
Zhang, Ying ;
Yu, Tao ;
Wang, Hua ;
Zhao, Hui ;
Zhao, Mei ;
Ji, Yan-Li ;
Chen, Yuan-Hua ;
Meng, Xiu-Hong ;
Wei, Wei ;
Xu, De-Xiang .
TOXICOLOGY LETTERS, 2012, 212 (03) :229-240
[7]
Pharmacologic ER stress induces non-alcoholic steatohepatitis in an animal model [J].
Lee, Jin-Sook ;
Zheng, Ze ;
Mendez, Roberto ;
Ha, Seung-Wook ;
Xie, Youming ;
Zhang, Kezhong .
TOXICOLOGY LETTERS, 2012, 211 (01) :29-38
[8]
Saturated fatty acid induction of endoplasmic reticulum stress and apoptosis in human liver cells via the PERK/ATF4/CHOP signaling pathway [J].
Cao, Jie ;
Dai, Dong-Ling ;
Yao, Long ;
Yu, Hui-Hong ;
Ning, Bo ;
Zhang, Qin ;
Chen, Juan ;
Cheng, Wen-Hui ;
Shen, Wei ;
Yang, Zhao-Xia .
MOLECULAR AND CELLULAR BIOCHEMISTRY, 2012, 364 (1-2) :115-129
[9]
SREBPs: metabolic integrators in physiology and metabolism.[J].Tae-Il Jeon;Timothy F. Osborne.Trends in Endocrinology & Metabolism.2011, 2
[10]
Endoplasmic reticulum stress in liver disease.[J].Harmeet Malhi;Randal J. Kaufman.Journal of Hepatology.2010, 4