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The Journal of General Physiology, Vol 85, 247-289, Copyright © 1985 by The Rockefeller University Press

ARTICLES

Time and calcium dependence of activation and inactivation of calcium- induced release of calcium from the sarcoplasmic reticulum of a skinned canine cardiac Purkinje cell

A Fabiato

Microprocessor-controlled changes of [free Ca2+] at the outer surface of the sarcoplasmic reticulum (SR) wrapped around individual myofibrils of a skinned canine cardiac Purkinje cell and aequorin bioluminescence recording were used to study the mechanism of Ca2+-induced release of Ca2+ from the SR. This Ca2+ release is triggered by a rapid increase of [free Ca2+] at the outer surface of the SR of a previously quiescent skinned cell. Ca2+-induced release of Ca2+ occurred under conditions that prevented any synthesis of ATP from ADP, was affected differentially by interventions that depressed the SR Ca2+ pump about equally, and required ionic conditions incompatible with all known Ca2+- releasing, uncoupled, partial reactions of the Ca2+ pump. Increasing the [free Ca2+]trigger up to an optimum increased the amount of Ca2+ released. A supraoptimum increase of [free Ca2+] trigger inactivated Ca2+-induced release of Ca2+, but partial inactivation was also observed at [free Ca2+] below that necessary for its activation. The amplitude of the Ca2+ release induced by a given increase of [free Ca2+] decreased when the rate of this increase was diminished. These results suggest that Ca2+-induced release of Ca2+ is through a channel across the SR membrane with time- and Ca2+-dependent activation and inactivation. The inactivating binding site would have a higher affinity for Ca2+ but a lower rate constant than the activating site. Inactivation appeared to be a first-order kinetic reaction of Ca2+ binding to a single site at the outer face of the SR with a Q10 of 1.68. The removal of inactivation was the slowest step of the cycle, responsible for a highly temperature-dependent (Q10 approximately 4.00) refractory period.
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