Key result
Acetylcholine induces greater sarcomere and myosin kinetic changes in left versus right atrial rat cardiomyocytes.
Why the study?
Acetylcholine modulates cardiac function and high concentrations may induce atrial fibrillation, but differences in its action on the mechanical function of left versus right atrial cardiomyocytes remain unclear.
Does acetylcholine differentially affect the contractile function of left versus right atrial cardiomyocytes in rats?
Population
Single rat left and right atrial cardiomyocytes
Comparison
ACh at 1, 10, and 100 µM vs baseline across LA vs RA cardiomyocytes
Design
Preclinical in vitro laboratory study
Authors
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Rat data show differential LA-RA cholinergic responses; hypothesis-generating and requires human confirmation before any clinical relevance.
Does acetylcholine differentially affect the contractile function of left versus right atrial cardiomyocytes in rats?
Acetylcholine provokes more pronounced changes in the time course of sarcomere shortening-relengthening and actin-myosin interaction kinetics in left atrial cardiomyocytes compared to right atrial cardiomyocytes in rats.
Butova et al. (2022) studied this question. Acetylcholine (ACh) vs. Right atria (RA) cardiomyocytes was evaluated on Parameters of sarcomere shortening-relengthening, cytosolic calcium transients, and cardiac myosin function. Acetylcholine provoked more pronounced changes in the time course of sarcomere shortening-relengthening and actin-myosin interaction kinetics in left atrial versus right atrial rat cardiomyocytes.
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