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Biophys J, January 2000, p. 334-343, Vol. 78, No. 1
Department of Physiology, Loyola University Chicago, Maywood, Illinois 60153 USA
Our aim was to measure the influence of sarcoplasmic
reticulum (SR) calcium content ([Ca]SRT) and free SR
[Ca] ([Ca]SR) on the fraction of SR calcium released
during voltage clamp steps in isolated rabbit ventricular myocytes.
[Ca]SRT, as measured by caffeine application, was
progressively increased by conditioning pulses. Sodium was absent in
both the intracellular and in the extracellular solutions to block
sodium/calcium exchange. Total cytosolic calcium flux during the
transient was inferred from ICa,
[Ca]SRT, [Ca]i, and cellular buffering
characteristics. Fluxes via the calcium current
(ICa), the SR calcium pump, and passive leak
from the SR were evaluated to determine SR calcium release flux
(Jrel). Excitation-contraction (EC) coupling was
characterized with respect to both gain (
Jrel/
ICa) and fractional SR
calcium release. Both parameters were virtually zero for a small, but measurable [Ca]SRT. Gain and fractional SR calcium
release increased steeply and nonlinearly with both
[Ca]SRT and [Ca]SR. We conclude that
potentiation of EC coupling can be correlated with both
[Ca]SRT and [Ca]SR. While fractional SR
calcium release was not linearly dependent upon [Ca]SR,
intra-SR calcium may play a crucial role in regulating the SR calcium
release process.
Biophys J, January 2000, p. 334-343, Vol. 78, No. 1
© 2000 by the Biophysical Society 0006-3495/00/01/334/10 $2.00
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