Key result
Acute failing rat ventricles exhibit a novel 5-HT2A-mediated inotropic response dominating over 5-HT4 receptors.
Why the study?
Whether serotonin receptor expression and responsiveness occur in acute congestive heart failure and how they vary with disease progression were unknown.
Population
Male Wistar rats with postinfarction acute congestive heart failure induced by coronary artery ligation
Comparison
Acute failing ventricle vs nonligated sham-operated controls
Design
Preclinical experimental study measuring contractility, mRNA, phosphorylation, and Ca2+ transients
Authors
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Acute post-MI 5-HT4 emergence in rats needs validation; leaves open early serotonergic targeting in human CHF.
In acute heart failure, ventricular contractility is dually regulated by serotonin via newly induced 5-HT2A and 5-HT4 receptors, providing novel mechanistic insights into neurohumoral responses in acute CHF.
Qvigstad et al. (2005) studied Acute congestive heart failure. Acute congestive heart failure (induced by coronary artery ligation) vs. Nonligated sham-operated rats was evaluated on Ventricular contractility, mRNA levels, myosin light chain-2 phosphorylation, and Ca2+ transients. Acute failing rat ventricles exhibited a novel 5-HT2A receptor-mediated inotropic response that dominated over induced 5-HT4 receptors, accompanied by increased 5-HT2A mRNA levels.
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