These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Specific enhancement of norepinephrine-induced contraction in rat veins after beta adrenergic antagonists.
    Author: Cohen ML, Wiley KS.
    Journal: J Pharmacol Exp Ther; 1977 May; 201(2):406-16. PubMed ID: 16122.
    Abstract:
    Propranolol markedly increased the norepinephrine-induced maximal force in circular smooth muscle of the rat portal, mesenteric, renal and, to a lesser extent, femoral veins without affecting aortic or mesenteric artery responses to norepinephrine. Furthermore, two other beta receptor antagonists, practolol and N-isopropylmethoxamine, specifically enhanced maximal venous responses to norepinephrine. Contractions to norepinephrine, but not to serotonin, were increased by propranolol only in veins, even after the vasodilator, papaverine. The ability of propranolol to enhance norepinephrine-induced contraction in these rat veins paralleled the effectiveness of isoproterenol to relax such tissues. In addition, beta receptor antagonists enhanced the response of veins to the field stimulated release of norepinephrine from sympathetic nerves. These data support the conclusion that beta adrenergic stimulation modulates norepinephrine-induced constriction in certain rat veins but not in the aorta or mesenteric artery.
    [Abstract] [Full Text] [Related] [New Search]