期刊
GUT
卷 62, 期 7, 页码 1044-1054出版社
BMJ PUBLISHING GROUP
DOI: 10.1136/gutjnl-2012-303347
关键词
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资金
- National Creative Research Initiatives Grant from the Korean Ministry of Education, Science and Technology [20110018305]
- Future-based Technology Development Programme (BIO Fields) through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [20100019512]
- KRIBB Research Initiative Programme of Korea
- NIH [DK44442, DK58379]
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology, Korea [2011-0016454, 2011-0019448]
Background The hepatic endocannabinoid system and cytochrome P450 2E1 (CYP2E1), a key enzyme causing alcohol-induced reactive oxygen species (ROS) generation, are major contributors to the pathogenesis of alcoholic liver disease. The nuclear hormone receptor oestrogen-related receptor gamma (ERR gamma) is a constitutively active transcriptional activator regulating gene expression. Objective To investigate the role of ERR gamma in the alcohol-mediated regulation of CYP2E1 and to examine the possibility to control alcohol-mediated oxidative stress and liver injury through an ERR gamma inverse agonist. Design For chronic alcoholic hepatosteatosis study, C57BL/6J wild-type and CB1(-/-) mice were administered alcohol for 4 weeks. GSK5182 and chlormethiazole (CMZ) were given by oral gavage for the last 2 weeks of alcohol feeding. Gene expression profiles and biochemical assays were performed using the liver or blood of mice. Results Hepatic ERR gamma gene expression induced by alcohol-mediated activation of CB1 receptor results in induction of CYP2E1, while liver-specific ablation of ERR. gene expression blocks alcohol-induced expression of CYP2E1 in mouse liver. An ERR gamma inverse agonist significantly ameliorates chronic alcohol-induced liver injury in mice through inhibition of CYP2E1-mediated generation of ROS, while inhibition of CYP2E1 by CMZ abrogates the beneficial effects of the inverse agonist. Finally, chronic alcohol-mediated ERR gamma and CYP2E1 gene expression, ROS generation and liver injury in normal mice were nearly abolished in CB1(-/-) mice. Conclusions ERR gamma, as a previously unrecognised transcriptional regulator of hepatic CB1 receptor, controls alcohol-induced oxidative stress and liver injury through CYP2E1 induction, and its inverse agonist could ameliorate oxidative liver injury due to chronic alcohol exposure.
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