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• W2079594517 abstract "We developed protocols with intact cultured neonatal rat myocytes to directly evaluate the function of the sarcoplasmic reticulum (SR) Ca-ATPase (or SERCA2), Na-Ca exchange (Na-CaX), and slow Ca transport systems (mitochondria and sarcolemmal Ca-ATPase). Spontaneously beating control cells were compared with cells cultured for 2 days in the presence of verapamil (verapamil-arrested cells, VA). Intracellular calcium (Cai) transients were measured by use of indo-1 during (1) spontaneous twitches, (2) contractures induced by rapid application of caffeine (CafC, with and without Nao), and (3) twitches induced by brief depolarizations with high [K]o solution (K-twitches). We also measured mRNA levels for the SR Ca-ATPase and Na-CaX in the same experimental preparations. The t1/2 for [Ca]i decline when both the SR Ca uptake and Na-CaX were prevented was the same for control and VA cells (approximately 20 seconds), indicating unaltered slow Ca transport systems. Similarly, there was no significant difference in the t1/2 of CafC when Na-CaX was the main mechanism responsible for [Ca]i decline (t1/2 approximately 1.5 seconds), indicating unaltered Na-CaX. Conversely, we found nearly a twofold increase in the rate of [Ca]i decline during K-twitches (control t1/2, 0.84 +/- 0.05 seconds; VA t1/2, 0.48 +/- 0.06 second; P < .001), indicating an increase in SR Ca-pumping activity in VA cells. This was also reflected by a 56% increase in the peak [Ca]i reached during CafC used to assess maximal SR Ca content (427 +/- 49 nmol/L in control versus 665 +/- 75 nmol/L in VA cells).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W2079594517 date "1994-05-01" @default.
• W2079594517 modified "2023-10-16" @default.
• W2079594517 title "Contractile arrest increases sarcoplasmic reticulum calcium uptake and SERCA2 gene expression in cultured neonatal rat heart cells." @default.
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• W2079594517 doi "https://doi.org/10.1161/01.res.74.5.991" @default.
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