Original Research
Copyright ©The Author(s) 2001. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Aug 15, 2001; 7(4): 496-499
Published online Aug 15, 2001. doi: 10.3748/wjg.v7.i4.496
Sleep deprivation increase the expression of inducible heat shock protein 70 in rat gastric mucosa
Xi-Zhong Shen, Marcel W.L. Koo, Chi-Hin Cho
Xi-Zhong Shen, Department of Gastroenterology, Zhongshan Hospital, Fudan University, 136 Yixueyuan Road, Shanghai 200032, China
Marcel W.L. Koo, Chi-Hin Cho, Department of Pharmacology, Faculty of Medicine, University of Hong Kong, 5 Sassoon Road, Pokfulam, Hong Kong, China
Author contributions: All authors contributed equally to the work.
Supported by the CRCG grant from the University of Hong Kong.
Correspondence to: Dr. Marcel W.L. Koo, Department of Pharmacology, Faculty of Medicine, the University of Hong Kong, 5 Sassoon Road, Hong Kong, China. Wlkoo@hkusua.hku.hk
Telephone: 0086-852-8199256 Fax: 0086-852-28170859
Received: January 6, 2001
Revised: May 13, 2001
Accepted: May 20, 2001
Published online: August 15, 2001
Abstract

AIM: To investigate if sleep deprivation is able to increase the expression of inducible heat shock protein 70 in gastric mucosa and its possible role in mucosal defense.

METHODS: Rats for sleep disruption were placed inside a computerized rotating drum, gastric mucosa was taken from rats with 1, 3 and 7 d sleep deprivation. RT-PCR, immunohistochemistry and Western blotting were used to determine the expression of heat shock protein 70. Ethanol (500 mL·L-1, i.g.) was used to induce gastric mucosa damage.

RESULTS: RT-PCR, Western blotting and immunostaining confirmed that the sleep deprivation as a stress resulted in significantly greater expression of inducible heat shock protein 70 in gastric mucosa of rats. After the 500 mL·L-1 ethanol challenge, the ulcer area found in the rats with 7 d sleep deprivation (19.15 ± 4.2) mm2 was significantly lower (P < 0.01) than the corresponding control (53.7 ± 8.1) mm2.

CONCLUSION: Sleep deprivation as a stress, in addition to lowering the gastric mucosal barrier, is able to stimulate the expression of inducible heat shock protein 70 in gastric mucosa of rats, the heat shock protein 70 may play an important role in gastric mucosal protection.

Keywords: sleep deprivation; heat shock proteins 70/biosynthesis; gastric mucosa; rats