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Subcontracture depolarizations increase sarcoplasmic ionized calcium in frog rana temporaria skeletal muscle


Subcontracture depolarizations increase sarcoplasmic ionized calcium in frog rana temporaria skeletal muscle



American Journal of Physiology 248(5 Part 1): C520-C526



ISSN/ISBN: 0363-6143

The sarcoplasmic concentration of ionized Ca (Cai) of frog skeletal muscle was studied to determine if it may control its rate of metabolism by monitoring the changes in Cai due to perturbations that are known, to alter the rate of metabolism. Cai was measured with aequorin, which was microinjected into isolated fibers in sufficient quantity to detect basal Cai. When these fibers were exposed to 5-18 mM KCl, 75 mM RbCl2 or 100 mM CsCl2, there was an increase in the aequorin signal. The K-evoked increase in the aequorin signal was diminished by an increase in the extracellular concentration of Ca or by Ca-free media containing 3.6 nM Mg, Mn, Sr or Zn but was enhanced by subcontracture concentrations of caffeine or media containing nitrate instead of chloride. Ca, may control the rate of metabolism in frog skeletal muscle fibers.

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Accession: 006534004

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Related references

Subcontracture depolarizations increase sarcoplasmic ionized calcium in frog skeletal muscle. American Journal of Physiology 248(5 Pt 1): C520-C526, 1985

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