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Differences in basal endothelium-derived relaxing factor activity in different artery types.

P Collins·S P Chappell·T M Griffith·M J Lewis·A H Henderson
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Abstract

Mechanical responses and calcium influx were measured in order to compare basal endothelium-derived relaxing factor (EDRF) activity in isolated preparations of rabbit aorta, rat aorta, and dog coronary artery. EDRF activity was characterized by endothelium-dependent mechanical relaxation and reduction of 45Ca influx which could be blocked by EDRF inhibitors. In resting preparations, the mechanical effects of basal EDRF were negligible in all preparations, and a small effect on calcium influx was demonstrated only in rat preparations. In agonist-constricted preparations, basal EDRF activity had only a small mechanical effect in rabbit preparations but markedly depressed constriction in rat and dog preparations; likewise, it had no demonstrable effect on calcium influx in rabbit preparations but had a marked effect in rat and dog preparations. In both resting and agonist-stimulated rabbit preparations, endothelium caused a cyclooxygenase product-dependent increase in calcium influx. Thus, basal EDRF activity has little or no effect in resting preparations and little or no effect in agonist-stimulated rabbit aorta preparations, but a marked effect in agonist-stimulated rat aorta and dog coronary preparations.

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AnimalsAorta, ThoracicCalciumCoronary VesselsElectric StimulationEndotheliumIn Vitro TechniquesMaleMuscle ContractionMuscle, Smooth, VascularNitric OxideRabbitsVasodilator AgentsJournal ArticleResearch Support, Non-U.S. Gov't

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P Collins, S P Chappell, T M Griffith, M J Lewis, A H Henderson. Differences in basal endothelium-derived relaxing factor activity in different artery types.. https://doi.org/10.1097/00005344-198611000-00010

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