Effects of tannins and related polyphenols on superoxide-induced histamine release from rat peritoneal mast cells

R. Kanoh, T. Hatano, H. Ito, T. Yoshida, M. Akagi

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The effects of tannins and related polyphenols on KO2- and compound 48/80-induced histamine release from rat peritoneal mast cells were examined. Pretreatment with hydrolyzable tannins (1-100μM) significantly inhibited KO2-induced histamine release. Dimeric ellagitannins, which have hexahydroxydiphenoyl (HHDP) and valoneoyl residues and/or a valoneoyl-related acyl unit in the molecule, showed more potent inhibitory effects than monomeric hydrolyzable tannins. The most effective inhibition was exhibited by agrimoniin and euphorbin C (IC50) 0.68 and 0.80 μM), which have dehydrodigalloyl and euphorbinoyl groups, respectively, as well as the HHDP group. However, procyanidins, flavonoids and related polyphenols with small molecular weights, except for epigallocatechin gallate, exhibited negligible effects. Although clinically used antiallergic drugs, azelastine, astemizole, ketotifen and epinastine have been shown to prevent KO2-induced histamine release, their potencies were all less than those of ellagitannins. An inhibitory effect on compound 48/80-induced histamine release was also exhibited by higher molecular weight tannins. The inhibitory effect on histamine release caused by different stimulants suggested that ellagitannins act as cell membrane stabilizers as well as radical scavengers.

Original languageEnglish
Pages (from-to)297-302
Number of pages6
JournalPhytomedicine
Volume7
Issue number4
DOIs
Publication statusPublished - Jul 2000

Keywords

  • Histamine release
  • Mast cells
  • Superoxide anion
  • Tannins

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology
  • Pharmaceutical Science
  • Drug Discovery
  • Complementary and alternative medicine

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