Basic Research
Copyright ©2008 The WJG Press and Baishideng. All rights reserved.
World J Gastroenterol. Jul 21, 2008; 14(27): 4324-4331
Published online Jul 21, 2008. doi: 10.3748/wjg.14.4324
Effects of ethanol on insulin-like growth factor-I system in primary cultured rat hepatocytes: Implications of JNK1/2 and alcoholdehydrogenase
Young-Il Oh, Jong-Hoon Kim, Chang-Won Kang
Young-Il Oh, Jong-Hoon Kim, Chang-Won Kang, Department of Veterinary Physiology, College of Veterinary Medicine, Bio-Safety Research Institute, Chonbuk National University, Jeonju 561-756, South Korea
Author contributions: Oh YI designed and performed the most of the study; Kim JH helped with manuscript preparation; Kang CW is the principal investigator, conducted data analysis and prepared the manuscript.
Correspondence to: Chang-Won Kang, MD, PhD, Department of Veterinary Physiology, College of Veterinary Medicine, Bio-Safety Research Institute, Chonbuk National University, Jeonju 561-756, South Korea. cwkang@chonbuk.ac.kr
Telephone: +82-63-2703715
Fax: +82-63-2703780
Received: April 18, 2008
Revised: June 2, 2008
Accepted: June 9, 2008
Published online: July 21, 2008
Abstract

AIM: To evaluate the effects of ethanol on the insulin-like growth factor-I (IGF-I) system involved in c-Jun N-terminal kinase (JNK1/2) and alcoholdehydrogenase (ADH) activity in primary cultured rat hepatocytes.

METHODS: Hepatocytes isolated from male Sprague-Dawley rats were incubated with various concentrations of ethanol for different durations of time. The cells were pretreated with SP600125 (10 &mgr;mol/L) and 4-MP (200 &mgr;mol/L), and then treated with ethanol (200 mmol/L). We then measured IGF-Isecretion, IGF-I mRNA expression, cell viability and JNK1/2 activity by radioimmunoassay, RT-PCR, MTT assay and Western blot, respectively (n = 6).

RESULTS: Ethanol induced the activity of phospho (p)-JNK1/2, reaching a maximum at 60 min and then decreasing at 180 min. The effects of ethanol on the IGF-I system were increased at 60 min (secretion: 7.11 ± 0.59 ng/mg protein vs 4.91 ± 0.51 ng/mg, mRNA expression: 150.2% ± 10.2% vs 101.5% ± 11.3%, P = 0.045) and then decreased at 180 min (secretion: 3.89 ± 0.25 ng/mg vs 5.4 ± 0.54 ng/mg protein; mRNA expression: 41.5% ± 10.4% vs 84.7% ± 12.1%, P = 0.04), however cell viability was decreased in a dose- and time-dependent manner. SP600125 blocked the ethanol-induced changes (at 60 min). Additionally, 4-methylpyrazole prevented the ethanol-induced decreases in the IGF-I system, cell viability and p-JNK1/2 activity (at 180 min).

CONCLUSION: This study suggests that ethanol-induced p-JNK1/2 activation is associated with the IGF-I system and cell viability in hepatocytes. Furthermore, alcohol dehydrogenase is involved in the relationship between ethanol-induced inactivation of p-JNK1/2 and the changes of the IGF-I system and cell viability.

Keywords: Insulin-like growth factor-I; Insulin-like growth factor-I receptor; C-Jun N-terminal kinase; Hepatocyte; Ethanol