Exogenous nitric oxide increases neutrophil adhesion to cultured human endothelial monolayers through a protein kinase G dependent mechanism.

Abstract:

:Endothelial-neutrophil adhesion is a critical step in acute inflammatory diseases, which is mediated in part by P-selectin and platelet-activating factor (PAF). Nitric oxide (NO) is well known as an endogenous second messenger derived from endothelial cells, and regulates many important physiological events, however, the direct effects of NO on endothelial-neutrophil adhesion is less well understood. The objective of this study was to examine whether, and how relatively high levels of exogenous NO increases neutrophil adhesion with respect to P-selectin and PAF. Endothelial monolayers were exposed to chemical agents for 30 min, and the adhesion of 51Cr-labeled neutrophils measured in a static adhesion assay. Spermine-NONOate (SNO), an NO donor, significantly increased neutrophil adhesion and expression of P-selectin at a concentration of 1 mM. SNO (1 mM)-mediated neutrophil adhesion was significantly inhibited by a protein kinase G inhibitor, KT5823 (0.5 microM), but not by a classical protein kinase C inhibitor, Gö6976 (10 nM), a tyrosine kinase inhibitor, genistein (1 microM), or a protein kinase A inhibitor, H-89 (0.1 microM). P-selectin surface expression induced by 1 mM SNO was also significantly inhibited by 0.5 microM KT5823. Conversely, a cytoplasm calcium chelator, TMB-8 (0.1 mM), significantly exacerbated both the neutrophil adhesion and P-selectin expression induced by SNO. WEB 2086 (10 microM), a PAF receptor antagonist, blocked neutrophil adhesion, but did not block P-selectin expression induced by SNO. These data suggest that NO increases endothelial-neutrophil adhesion through protein kinase G-mediated P-selectin mobilization to the cell surface and endothelial PAF synthesis.

journal_name

Inflammation

journal_title

Inflammation

authors

Okayama N,Coe L,Itoh M,Alexander JS

doi

10.1023/a:1020287516911

keywords:

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

37-50

issue

1

eissn

0360-3997

issn

1573-2576

journal_volume

23

pub_type

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