Thromboxane A2 receptor blockade suppresses intercellular adhesion molecule-1 expression by stimulated vascular endothelial cells.

Abstract:

:Inhibition of the thromboxane A2-synthesizing enzyme (DP-1904: [+/-]-6-[1-imidazolylmethyl]-5,6,7,8-tetrahydronaphthalene-2-carbo xylic acid hydrochloride hemihydrate) reportedly suppresses intercellular adhesion molecule-1 (ICAM-1) expression on the surface of stimulated vascular endothelial cells (Ishizuka et al., 1994, Eur. J. Pharmacol 262, 113). In the present study, thromboxane A2 receptor antagonists suppressed the expression of ICAM-1 on the surface of human vascular endothelial cells that were stimulated by tumor necrosis factor alpha (TNF alpha), platelet activating factor (PAF), or U46619 (9,11-dideoxy-9 alpha, 11 alpha-epoxymethanoprostaglandin F2 alpha). Augmentation of ICAM-1 expression on human vascular endothelial cells stimulated by U46619 was suppressed by protein kinase C inhibitors. Thromboxane A2 receptor antagonist suppressed U46619 stimulation of protein kinase C activity of a cell membrane fraction. These results indicate that in human vascular endothelial cells, thromboxane A2, the production and secretion of which is stimulated by TNF alpha or PAF, binds to the thromboxane A2 receptors on cell membranes and augments ICAM-1 expression on the cell surfaces mainly through protein kinase C.

journal_name

Eur J Pharmacol

authors

Ishizuka T,Suzuki K,Kawakami M,Hidaka T,Matsuki Y,Nakamura H

doi

10.1016/0014-2999(96)00478-5

subject

Has Abstract

pub_date

1996-10-03 00:00:00

pages

367-77

issue

3

eissn

0014-2999

issn

1879-0712

pii

0014299996004785

journal_volume

312

pub_type

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