Journal
MUTATION RESEARCH-FUNDAMENTAL AND MOLECULAR MECHANISMS OF MUTAGENESIS
Volume 579, Issue 1-2, Pages 214-224Publisher
ELSEVIER
DOI: 10.1016/j.mrfmmm.2005.03.027
Keywords
green tea polyphenol; ethanol-induced gastropathy; COX-2 and iNOS; transcription factors; mitogen-activated protein kinases
Ask authors/readers for more resources
There are multiple lines of compelling evidence from epidemiologic and laboratory studies supporting that frequent consumption of green tea is inversely associated with the risk of chronic human diseases including cancer. The chemopreventive and chemoprotective effects of green tea have been largely attributed to antioxidative and anti-inflammatory activities of its polyphenolic constituents, such as epigallocatechin gallate. The present study was designed to evaluate the efficacy of green tea polyphenols in protecting against alcohol-induced gastric damage and to elucidate the underlying mechanisms. Intragastric administration of ethanol to male Sprague-Dawley rats caused significant gastric mucosal damage, which was accompanied by elevated expression of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (NOS) its well as transient activation of redox-sensitive transcription factors, such as NF-kappa B and AP-1, and mitogen-activated protein kinases (MAPKs). Oral administration of the green tea polyphenolic extract (GTE) significantly ameliorated mucosal damages induced by ethanol and also attenuated the ethanol-induced expression of COX-2 and NOS. Inactivation of MAPKs, especially p38 and ERK1/2, by GTE might be responsible for inhibition of ethanol-induced expression of COX-2 and NOS. (c) 2005 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available