Effect of luminal calcium on Ca2+ release channel activity of sarcoplasmic reticulum in situ

Biophysical Journal
Nagomi Kurebayashi, Y Ogawa

Abstract

Ca2+ influx into empty SR in the absence of Ca2+ pump activity was determined in skinned frog skeletal muscle fibers and compared with Ca2+ efflux from loaded SR (i.e., Ca2+ release) to deepen our understanding of the properties of the Ca2+ release channel (CRC). Calcium content in SR increased approximately in a first-order kinetics and finally reached the equilibrium level determined by cytoplasmic Ca2+ ([Ca2+]c). Because AMP caused an increase in the rate of Ca2+ influx, and procaine, Mg2+, and high concentrations of Ca2+ caused a characteristic decrease, the major Ca2+ influx pathway was concluded to be the CRC, as is true of Ca2+ release. The apparent rate constant (k(app)) of Ca2+ efflux did not significantly change when the loading level was decreased to one-third. At a given [Ca2+]c, the same equilibrium level of calcium in SR was attained with a similar k(app) by both Ca2+ influx and Ca2+ efflux. The relationship between [Ca2+]c and calcium in SR indicated the Ca2+ binding sites in SR. These results, together with the anticipated effects of these Ca2+ buffer sites on kinetics, are consistent with the idea that luminal Ca2+ inhibits the CRC.

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Citations

Jan 11, 2001·Trends in Cardiovascular Medicine·Y OgawaT Murayama
Nov 30, 2002·Trends in Cardiovascular Medicine·Takashi Murayama, Yasuo Ogawa
Jun 23, 2006·Clinical and Experimental Pharmacology & Physiology·Huong H Trinh, Graham D Lamb
Sep 7, 2004·Biophysical Journal·Thomas R ShannonDonald M Bers
Dec 11, 2007·Biochemical and Biophysical Research Communications·Yasuo Ogawa
May 8, 2003·Canadian Journal of Physiology and Pharmacology·James S C GilchristTom Cook
Oct 20, 2001·Journal of Applied Physiology·L M HeunksG C Sieck

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