Characterization of a novel and potent collagen antagonist, caffeic acid phenethyl ester, in human platelets: in vitro and in vivo studies.

Abstract:

OBJECTIVE:Caffeic acid phenethyl ester (CAPE), which is derived from the propolis of honeybee hives, has been demonstrated to possess multiple pharmacological activities. In the present study, CAPE (6-25 microM) specifically inhibited collagen-induced platelet aggregation and the ATP release reaction in platelet suspensions. METHODS:Platelet aggregation, flow cytometric analysis, immunoblotting, and electron spin resonance (ESR) were used to assess the anti-platelet activity of CAPE. Fluorescein sodium-induced platelet thrombi in mesenteric microvessels of mice were used for an in vivo study. RESULTS:CAPE (15-100 microM) produced a concentration-related rightward displacement of the collagen concentration-response curve, and the Schild plot gave pA(2) and pA(10) values of 4.28+/-0.07 and 3.14+/-0.73, respectively, with a slope of -0.83+/-0.16, indicating specific antagonism. CAPE (25 microM) also inhibited platelet aggregation stimulated by the glycoprotein VI agonist, convulxin, and the alpha(2)beta(1) integrin agonist, aggretin. CAPE (25 microM) also markedly interfered with FITC-collagen binding to platelet membranes. CAPE (15 and 25 microM) concentration-dependently inhibited collagen-induced platelet activation accompanied by [Ca(+2)](i) mobilization, phosphoinositide breakdown, activation of protein kinase C and mitogen-activated protein kinases (i.e., ERK2, JNK, and p38 MAPK), Akt phosphorylation, and thromboxane A(2) formation. In the ESR study, CAPE (15 and 25 microM) markedly reduced hydroxyl radical (OH) formation in collagen-activated platelets. In an in vivo study, CAPE (5 mg/kg) significantly prolonged the latency in inducing platelet plug formation in mesenteric venules of mice. CONCLUSIONS:The most important findings of this study suggest that CAPE specifically inhibits collagen-induced platelet activation. Thus, CAPE treatment may represent a novel approach to lowering the risk of or improving function in thromboembolism-related disorders.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Hsiao G,Lee JJ,Lin KH,Shen CH,Fong TH,Chou DS,Sheu JR

doi

10.1016/j.cardiores.2007.05.005

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

782-92

issue

4

eissn

0008-6363

issn

1755-3245

pii

S0008-6363(07)00218-0

journal_volume

75

pub_type

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