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• W2022128387 abstract "To investigate Ca2+ handling in compensated hypertrophied cardiomyocytes, we measured Ca2+ transients and contraction of hypertrophied rat left ventricular myocytes induced by aortic constriction (AC). The fluorescence ratio (I405/I 480) after indo-1/AM Ioading and circumferential length were simultaneously measured in isolated myocytes. The amplitude of Ca2+ transients (Ca-Amp) was higher in rats with AC than in sham-operated rats (Sham) (0.25±0.08 vs 0.17±0.05) . There was a positive correlation between Ca-Amp and fractional shortening (FS) in both AC and Sham rats, whereas the ratio of FS/Ca-Amp was smaller in AC rats, These observations suggest that compensated hypertrophied cardiomyocytes exhibit an adaptive increase in Ca-Amp, associated with reduced myofilament responsiveness to an increase in Ca2+. Isoproterenol and forskolin increased Ca-Amp and FS, and decreased time to 50% decline of Ca2+ transients. Although myocytes from AC rats exhibited reduced responsiveness to isoproterenol, responses to forskolin did not differ between the 2 groups. The reduced β-adrenergic response in Ca2+ handling was probably due to altered β-adrenoceptor numbers, G-protein function and/or their coupling process. (Jpn Circ J 1997; 62: 36 - 46)" @default.
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• W2022128387 date "1998-01-01" @default.
• W2022128387 modified "2023-09-24" @default.
• W2022128387 title "Altered Calcium Handling in Compensated Hypertrophied Rat Cardiomyocytes Induced by Pressure Overload" @default.
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• W2022128387 doi "https://doi.org/10.1253/jcj.62.36" @default.
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