The Protective Role of Per2 Against Carbon Tetrachloride-induced Hepatotoxicity

被引:35
作者
Chen, Peng [1 ]
Li, Chunying [2 ]
Pang, Wenqaing [1 ]
Zhao, Yue [1 ]
Dong, Wei [1 ]
Wang, Shiming [1 ]
Zhang, Jianfa [1 ]
机构
[1] Nanjing Univ Sci & Technol, Ctr Mol Metab, Nanjing 210094, Peoples R China
[2] Fourth Mil Med Univ, Xijing Hosp, Xian 710032, Peoples R China
基金
美国国家科学基金会;
关键词
UNCOUPLING PROTEIN-2; CIRCADIAN CLOCK; MITOCHONDRIAL DYSFUNCTION; GENE-EXPRESSION; UP-REGULATION; PPAR-ALPHA; LIVER; METABOLISM; MECHANISMS; ATP;
D O I
10.2353/ajpath.2009.080430
中图分类号
R36 [病理学];
学科分类号
100104 ;
摘要
Period 2 (Per2) is a key component of the core clock oscillator and is involved in regulating a number of different biological processes and pathways. Here we report that Per2 plays a protective role in carbon tetrachloride (CCl4)-induced hepatotoxicity via the modulation of uncoupling protein-2 (Ucp2) gene expression in mice. Hepatic injury after acute CCl4 injection was monitored in both wild-type and Per2-null mice. At the 12-hour time point after CCl4 treatment, many more vacuolations were observed in the liver tissues of Per2-null mice whereas fatty tissue degeneration primarily occurred in the liver tissues of wide-type mice. Serum alanine and aspartate aminotransferase activities were elevated in Per2-null mice compared with wide-type mice at 24 hours after CCl4 treatment, which was in agreement with the observation of significantly larger areas of centrilobular necrosis in the livers of Per2-null mice. A deficit of the Per2 gene enhanced Ucp2 gene expression levels in the liver. As a consequence, intracellular levels of ATP markedly decreased in the liver, allowing increased production Of toxic CCl4 derivatives. The absence of Per2 expression caused a dramatic elevation of Clock expression and influenced Ucp2 through a mechanism that involved a Clock-controlled PPAR-a signal transduction pathway. Our studies suggest that the Per2 gene functions in hepatocyte protection from chemical toxicants via the regulation of hepatic Ucp2 gene expression levels. (Am J Pathol 2009, 174:63-70; DOI. 10.2353/ajpath.2009.080430)
引用
收藏
页码:63 / 70
页数:8
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