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Permanent Ligation of the Left Anterior Descending Coronary Artery in Mice: A Model of Post-myocardial Infarction Remodelling and Heart Failure
09:37

Permanent Ligation of the Left Anterior Descending Coronary Artery in Mice: A Model of Post-myocardial Infarction Remodelling and Heart Failure

Published on: December 2, 2014

Coronary vascular reactivity after acute myocardial ischemia

D D Ku

    Science (New York, N.Y.)
    |November 5, 1982
    PubMed

    Insights

    Thrombin causes blood vessels to widen then narrow. Damaged coronary arteries lose their widening response to thrombin, potentially contributing to coronary vasospasm.

    Area of Science:

    • Cardiovascular Physiology
    • Endothelial Function
    • Thrombosis Research

    Background:

    • Thrombin is a key enzyme in blood coagulation.
    • Endothelial cells lining blood vessels play a crucial role in regulating vascular tone.
    • Altered vascular responses are implicated in cardiovascular diseases like vasospasm.

    Purpose of the Study:

    • To investigate the effects of exogenous thrombin on canine coronary arteries.
    • To determine the role of endothelial cells in thrombin-induced vascular responses.
    • To explore the implications of altered thrombin responses in ischemic conditions and vasospasm.

    Main Methods:

    • Administration of exogenous thrombin to canine coronary arteries.
    • Assessment of vascular responses (vasodilation and vasoconstriction).
    • Evaluation of the effects of blocking agents (heparin, propranolol, atropine, indomethacin) and endothelial denudation.

    Main Results:

    • Exogenous thrombin induced a biphasic response: dose-related vasodilation followed by vasoconstriction in nonischemic arteries.
    • Vasodilation was blocked by heparin or endothelial denudation, but not by propranolol, atropine, or indomethacin.
    • Ischemic arteries showed a loss of thrombin-induced vasodilation and enhanced vasoconstriction.

    Conclusions:

    • Endothelial cells are critical for thrombin-mediated vasodilation in coronary arteries.
    • Damaged endothelium alters responses to thrombin, potentially leading to vasoconstriction.
    • Altered thrombin responses in damaged coronary arteries may contribute to the pathogenesis of coronary vasospasm.

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