Inhibitory effects of epigallocatechin gallate on compound 48/80-inducedmast cell activation and passive cutaneous anaphylaxis.
- Author:
Guang Zhao LI
1
;
Ok Hee CHAI
;
Chang Ho SONG
Author Information
1. Department of Anatomy and Research Center for Allergic Immune Diseases, Chonbuk National University Medical School, Jeonju, Jeonbuk 561-756, Korea. asch@chonbuk.ac.kr
- Publication Type:Original Article ; Research Support, Non-U.S. Gov't
- Keywords:
calcium signaling;
cell degranulation;
cyclic AMP;
epigallocatechin gallate;
histamine;
mast cell
- MeSH:
Animals;
Antioxidants/*pharmacology;
Catechin/*analogs & derivatives/pharmacology;
Cyclic AMP/metabolism;
Histamine Release/*drug effects;
Mast Cells/*drug effects/metabolism;
Passive Cutaneous Anaphylaxis/*drug effects;
Rats;
Research Support, Non-U.S. Gov't;
p-Methoxy-N-methylphenethylamine/*antagonists & inhibitors
- From:Experimental & Molecular Medicine
2005;37(4):290-296
- CountryRepublic of Korea
- Language:English
-
Abstract:
Epigallocatechin gallate (EGCG) is a principle phenolic antioxidant found in a variety of plants, including green and black tea. The anti-allergic effect of EGCG is unknown. The purpose of this study is to investigate the effects of EGCG on compound 48/80-induced mast cell activation and passive cutaneous anaphylaxis. For this, the influences of EGCG on the compound 48/80-induced cutaneous reaction were measured in vivo and the effects of EGCG on the compound 48/80-induced mast cell activations were examined in vitro. Results are below: as 1) EGCG significantly inhibited compound 48/80-induced passive cutaneous anaphylaxis, 2) the compound 48/80-induced degranulation, calcium influx and histamine release of rat peritoneal mast cells (RPMCs) were significantly inhibited by the pretreatment with EGCG, and 3) the compound 48/80-mediated inhibition of cAMP level in RPMCs was significantly increased by the pretreatment with EGCG. These results suggested that EGCG, the most abundant polyphenol in green tea, inhibits the compound 48/80-induced mast cell activation and the increase of vascular permeability, and potentially serve as effective therapeutic tools for allergic diseases.
