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- W2915043129 abstract "Pomolic acid (PA) isolated from Licania pittieri has hypotensive effects in rats, inhibits human platelet aggregation and elicits endothelium-dependent relaxation in rat aortic rings. The present study was designed to investigate the effects of PA on cardiomyocytes. Trabeculae and enzymatically isolated cardiomyocytes from rats were used to evaluate the concentration-dependent effects of PA on cardiac muscle tension and excitation-contraction coupling (ECC) by recording Ca2+ transients reported with Fluo-3 and Fura-2, as well as L-type Ca2+ currents (LTCC). PA reduced the contractile force in rat cardiac trabeculae with an EC50 = 14.3 ± 2.4 μM. PA also reduced the amplitude of Ca2+ transients in a concentration-dependent manner, with an EC50 = 10.5 ± 1.3 μM, without reducing sarcoplasmic reticulum (SR) Ca2+ loading. PA decreased the half width of the Ca2+ transient by 31.7 ± 3.3% and increased the decay time and decay time constant (τ) by 7.6 ± 2.7% and 75.6 ± 3.7%, respectively, which was associated with increased phospholamban (PLN) phosphorylation. PA also reversibly reduced the macroscopic LTCC in the cardiomyocyte membrane, but did not demonstrate any effects on skeletal muscle ECC. In conclusion, PA reduces LTCC, Ca2+ transients and cardiomyocyte force, which along with its vasorelaxant effects explain its hypotensive properties. Increased PLN phosphorylation protected the SR from Ca2+ depletion. Considering the effects of PA on platelet aggregation and the cardiovascular system, we propose it as a new potential, multitarget cardiovascular agent with a demonstrated safety profile." @default.
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- W2915043129 date "2019-05-01" @default.
- W2915043129 modified "2023-10-14" @default.
- W2915043129 title "Pomolic acid reduces contractility and modulates excitation-contraction coupling in rat cardiomyocytes" @default.
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- W2915043129 doi "https://doi.org/10.1016/j.ejphar.2019.02.016" @default.
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