Linked Life Data

1742858

Source:http://linkedlifedata.com/resource/pubmed/id/1742858

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pubmed-article:1742858pubmed:abstractTextEndotoxic shock is characterized by a variety of hemodynamic disturbances which result in tissue hypoperfusion. There is some evidence for endothelial damage caused by endotoxin. The present study addressed the hypothesis that vascular responsiveness to endothelial-dependent vasodilators is altered in endotoxic shock. Dose-response relationships for an endothelial-dependent vasodilator, acetylcholine, and an endothelial-independent vasodilator, adenosine, were determined in guinea pig aortic rings. Rings were examined from either control (untreated) animals or from animals given Escherichia coli endotoxin (4 mg/kg, i.p.) 16 hr prior to functional studies. Dose-response relationships to adenosine were similar in aortic rings from control and shocked animals. However, response to acetylcholine were attenuated by 30% (P less than .05) in the shocked group. To distinguish between a direct, acute effect of endotoxin versus effects produced by systemic changes that occur during shock, rings were isolated from untreated animals and incubated with endotoxin in vitro for 30 min prior to and during dose-response measurements. Incubation with endotoxin caused no change in aortic responses to adenosine or acetylcholine. Electron microscopy revealed a separation of the endothelium from the internal elastic lamina and an increase in inter-endothelial gaps in rings isolated from shocked animals. These structural changes were not observed in rings from untreated animals or in rings incubated with endotoxin in vitro. We conclude that endothelial-dependent vasodilation is attenuated during endotoxic shock. The functional changes are correlated with ultrastructural alterations of the endothelium.lld:pubmed
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pubmed-article:1742858pubmed:authorpubmed-author:BerneR MRMlld:pubmed
pubmed-article:1742858pubmed:authorpubmed-author:YoungJ SJSlld:pubmed
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pubmed-article:1742858pubmed:dateRevised2003-11-14lld:pubmed
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pubmed-article:1742858pubmed:articleTitleEndothelial-dependent and -independent responses in the thoracic aorta during endotoxic shock.lld:pubmed
pubmed-article:1742858pubmed:affiliationDepartment of Physiology, University of Virginia, Charlottesville 22908.lld:pubmed
pubmed-article:1742858pubmed:publicationTypeJournal Articlelld:pubmed
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