Effect of caffeine on kinetics of accumulation and release of Ca2+ by vesicles of the sarcoplasmic reticulum of skeletal muscle
Diadiusha, G.P.
Ukrainskii Biokhimicheskii Zhurnal 57(6): 56-62
1985
ISSN/ISBN: 0201-8470 PMID: 4071684 Document Number: 255850
The action of caffeine was studied on the heavy sarcoplasmic reticulum fraction enriched by vesicles derived from terminal cisterns. Caffeine lowers the ATP-dependent accumulation of Ca2+ by vesicles and enhances the first rapid phase of the Ci2+ release from vesicles. The action of caffeine was transient, reversed, Ca2+-dependent. The data obtained suggest that the reduction of ATP-dependent calcium accumulation and enhancement of calcium release by caffeine are mediated by the mechanism of Ca2+-induced Ca2+ release and support the view that caffeine may regulate the equilibrium between open and closed states of Ca2+-channel by increasing the affinity of Ca2+-receptor site of the channel.