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. 1994 Aug 1;301(Pt 3):879–883. doi: 10.1042/bj3010879

Quantal Ca2+ mobilization by ryanodine receptors is due to all-or-none release from functionally discrete intracellular stores.

T R Cheek 1, M J Berridge 1, R B Moreton 1, K A Stauderman 1, M M Murawsky 1, M D Bootman 1
PMCID: PMC1137068  PMID: 8053911

Abstract

Low caffeine concentrations were unable to completely release the caffeine- and ryanodine-sensitive intracellular Ca2+ pool in intact adrenal chromaffin cells. This 'quantal' Ca2+ release is the same as that previously observed with inositol Ins(1,4,5)P3-induced Ca2+ release. The molecular mechanism underlying quantal Ca2+ release from the ryanodine receptor was investigated using fura-2 imaging of single chromaffin cells. Our data indicate that the intracellular caffeine-sensitive Ca2+ pool is composed of functionally discrete stores, that possess heterogeneous sensitivities to caffeine. These stores are mobilized by caffeine in a concentration-dependent fashion, and, when stimulated, individual stores release their Ca2+ in an 'all-or-none' manner. Such quantal Ca2+ release may be responsible for graded Ca2+ responses in single cells.

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Selected References

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