Sarcoplasmic Reticulum Ca <sup>2+</sup> Pumping Kinetics Regulates Timing of Local Ca <sup>2+</sup> Releases and Spontaneous Beating Rate of Rabbit Sinoatrial Node Pacemaker Cells

Tatiana M. Vinogradova, Didier X.P. Brochet, Syevda Sirenko, Yue Li, Harold A. Spurgeon, Edward G. Lakatta

Circulation Research · 2010 · 81 citations · 30 references

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Abstract

The LCR period, a critical determinant of the spontaneous SANC cycle length, is defined by the rate of SR Ca(2+) replenishment, which is critically dependent on SR pumping rate, Ca(2+) available for pumping, supplied by L-type Ca(2+) channel, and ryanodine receptor Ca(2+) release flux, each of which is modulated by cAMP-mediated protein kinase A-dependent phosphorylation.

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