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• W2010283286 abstract "The mean sarcomere length (SL) of guinea-pig cardiac myocytes was recorded simultaneously with the whole-cell current under voltage-clamp conditions. After blocking both sarcoplasmic reticulum (SR) and L-type Ca(2+) channels with ryanodine, cyclopiazonic acid and nicardipine, strong depolarizing pulses induced only the tonic component of SL shortening through the reverse mode of Na(+)/Ca(2+) exchange (NCX). A positive staircase of SL shortening was observed on applying a train pulses to +60~+100 mV at 2 Hz and trans-membrane Ca(2+) flux was calculated from the time integral of the Na(+)/Ca(2+) exchange current ( I(NCX)). Changes in cytosolic [Ca(2+)] ([Ca(2+)](i)) were determined indirectly using the experimental [Ca(2+)](i)/SL relationship. Cellular Ca(2+) buffering was characterized by a lumped single-component system with a maximum binding capacity of 200 micro M and a dissociation constant of 613 nM. Despite the decrease in driving force, the amplitude of the outwards I(NCX) at +60 mV gradually increased along with the positive staircase. The model simulation suggested that this increase of outwards I(NCX) is caused by a dramatic increase in Ca(2+)-mediated activation of NCX." @default.
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• W2010283286 date "2003-06-01" @default.
• W2010283286 modified "2023-10-10" @default.
• W2010283286 title "Involvement of Ca2+ buffering and Na+/Ca2+ exchange in the positive staircase of contraction in guinea-pig ventricular myocytes" @default.
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• W2010283286 doi "https://doi.org/10.1007/s00424-003-1023-1" @default.
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