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The impact of the 67kDa laminin receptor on both cell-surface binding and anti-allergic action of tea catechins.

Abstract：

:Here, we investigated the structure-activity relationship of major green tea catechins and their corresponding epimers on cell-surface binding and inhibitory effect on histamine release. Galloylated catechins; (-)-epigallocatechin-3-O-gallate (EGCG), (-)-gallocatechin-3-O-gallate (GCG), (-)-epicatechin-3-O-gallate (ECG), and (-)-catechin-3-O-gallate (CG) showed the cell-surface binding to the human basophilic KU812 cells by surface plasmon resonance analysis, but their non-galloylated forms did not. Binding activities of pyrogallol-type catechins (EGCG and GCG) were higher than those of catechol-type catechins (ECG and CG). These patterns were also observed in their inhibitory effects on histamine release. Previously, we have reported that biological activities of EGCG are mediated through the binding to the cell-surface 67kDa laminin receptor (67LR). Downregulation of 67LR expression caused a reduction of both activities of galloylated catechins. These results suggest that both the galloyl moiety and the B-ring hydroxylation pattern contribute to the exertion of biological activities of tea catechins and their 67LR-dependencies.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Fujimura Y,Umeda D,Yamada K,Tachibana H

doi

10.1016/j.abb.2008.03.002

subject

Has Abstract

pub_date

2008-08-15 00:00:00

pages

133-8

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(08)00120-3

journal_volume

476

pub_type

杂志文章

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