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This Article Full Text Full Text (PDF) All Versions of this Article: 287/4/R767    most recent 00248.2004v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (9) Citing Articles via Google Scholar Google Scholar Articles by Tsai, B. M. Articles by Meldrum, D. R. Search for Related Content PubMed PubMed Citation Articles by Tsai, B. M. Articles by Meldrum, D. R.

INFLAMMATION AND CYTOKINES

Endothelial monocyte-activating polypeptide II causes NOS-dependent pulmonary artery vasodilation: a novel effect for a proinflammatory cytokine

Departments of ¹Surgery and ³Cellular and Integrative Physiology, Indiana University School of Medicine; and ²Indiana Center for Vascular Biology and Medicine, Indianapolis, Indiana 46202

Submitted 15 April 2004 ; accepted in final form 18 May 2004

Endothelial monocyte-activating polypeptide (EMAP) II is a novel proinflammatory cytokine that is released from apoptotic and hypoxic cells. The purpose of this study was to determine the effect of EMAP II on the pulmonary artery (PA) and to characterize its mechanism of action. To study this, isolated PA rings from adult male Sprague-Dawley rats were suspended on steel hooks connected to force transducers and immersed in 37°C organ baths containing modified Krebs-Henseleit solution. After equilibration, force displacement of phenylephrine-preconstricted PA was measured in response to EMAP II. Experiments were performed in endothelium-intact rings, endothelium-denuded rings, and in the presence of the NOS inhibitor N-nitro-L-arginine methyl ester (L-NAME). Pulmonary artery rings were then subjected to quantitative PCR analysis for inducible NOS (iNOS) mRNA. EMAP II caused a maximal vasodilation of 251 ± 30.7 mg in endothelium-intact PA. EMAP II caused no vasodilation in endothelium-denuded and L-NAME-treated PA (20 ± 14.0 mg and 17.5 ± 7.5 mg, respectively, P < 0.001 vs. endothelium intact). In addition to its vasoactive properties, EMAP II increased PA iNOS mRNA twofold compared with controls. These results demonstrate that 1) EMAP II causes PA vasodilation; 2) EMAP II-mediated PA vasodilation is endothelium dependent and NOS dependent; and 3) EMAP II upregulates iNOS mRNA expression in PA. This report constitutes the first demonstration of EMAP II's effects on the pulmonary artery, its mechanism of action, and represents the identification of the first proinflammatory cytokine to cause PA vasodilation.

acute lung injury; hypoxia; apoptosis; inflammation; endothelium

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