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The Journal of Thoracic and Cardiovascular Surgery, Vol 102, 371-377, Copyright © 1991 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Time course and extent of recovery of endothelium-dependent contractions and relaxations after direct arterial injury

R Cartier, PJ Pearson, PJ Lin and HV Schaff
Division of Thoracic and Cardiovascular Surgery, Mayo Clinic, Rochester, Minn 55905.

To determine the time course of the return of endothelium-dependent relaxations and contractions during intimal regeneration, we performed balloon endothelial denudation of the thoracic and abdominal aorta of male Lewis rats and examined smooth muscle function and endothelium- dependent responses in vitro at 1, 2, 4, and 8 weeks after aortic injury. At each study interval during endothelial cell regeneration, vascular smooth muscle contracted and relaxed normally to direct stimulation with norepinephrine and sodium nitroprusside. Endothelium- dependent contractions to serotonin returned to normal at 1 week and developed into a hypercontractile response at 8 weeks. Endothelium- dependent relaxations to acetylcholine returned to normal at 8 weeks, but endothelium-dependent relaxations to adenosine diphosphate remained impaired. These experiments demonstrate that regenerating endothelium regains the ability to produce contracting factor before relaxing factor, and it even exhibits potentiated contractile activity 8 weeks after injury. Thus, after direct arterial injury, regenerating endothelium has abnormal endothelium-dependent function that predisposes the vessel to vasospasm and thrombosis.

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