Increased vascular contraction and sensitivity to norepinephrine after endothelial denudation is inhibited by prazosin.

Published

Journal Article

The vasomotor function of rabbit aorta was examined after deendothelialization with a Fogarty balloon catheter and during the subsequent development of intimal hyperplasia. Helical strips of injured lower abdominal aortic tissue showed an increase in norepinephrine-induced contraction when compared with control strips from normal upper abdominal aorta. This increase was 235% +/- 40% of control immediately after injury and 341% +/- 51% at 28 days after injury. Standardized dose-response curves demonstrated that the injured tissue was increasingly sensitive over time to norepinephrine and that this was more marked at physiologic levels of norepinephrine. Contraction was blocked by prazosin hydrochloride but not by yohimbine or propranolol. Furthermore, a single intramuscular dose of prazosin hydrochloride 2 hours before injury significantly (p = 0.001) reduced the maximal contraction and sensitivity. These results imply an increase in vasomotor reactivity after deendothelialization mediated through the alpha 1-adrenergic receptor. These functional changes are related to the pertinent morphologic observations.

Full Text

Duke Authors

Cited Authors

  • O'Malley, MK; Hagen, PO; Mikat, EM; Cole, CW; Radic, ZS; McCann, RL

Published Date

  • January 1, 1986

Published In

Volume / Issue

  • 99 / 1

Start / End Page

  • 36 - 44

PubMed ID

  • 3001959

Pubmed Central ID

  • 3001959

International Standard Serial Number (ISSN)

  • 0039-6060

Language

  • eng

Conference Location

  • United States