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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1995 Aug 15;92(17):7907–7911. doi: 10.1073/pnas.92.17.7907

Depletion-activated calcium current is inhibited by protein kinase in RBL-2H3 cells.

A B Parekh 1, R Penner 1
PMCID: PMC41255  PMID: 7644512

Abstract

Whole-cell patch-clamp recordings and single-cell Ca2+ measurements were used to study the control of Ca2+ entry through the Ca2+ release-activated Ca2+ influx pathway (ICRAC) in rat basophilic leukemia cells. When intracellular inositol 1,4,5-trisphosphate (InsP3)-sensitive stores were depleted by dialyzing cells with high concentrations of InsP3, ICRAC inactivated only slightly in the absence of ATP. Inclusion of ATP accelerated inactivation 2-fold. The inactivation was increased further by the ATP analogue adenosine 5'-[gamma-thio]triphosphate, which is readily used by protein kinases, but not by 5'-adenylyl imidodiphosphate, another ATP analogue that is not used by kinases. Neither cyclic nucleotides nor inhibition of calmodulin or tyrosine kinase prevented the inactivation. Staurosporine and bisindolylmaleimide, protein kinase C inhibitors, reduced inactivation of ICRAC, whereas phorbol ester accelerated inactivation of the current. These results demonstrate that a protein kinase-mediated phosphorylation, probably through protein kinase C, inactivates ICRAC. Activation of the adenosine receptor (A3 type) in RBL cells did not evoke much Ca2+ influx or systematic activation of ICRAC. After protein kinase C was blocked, however, large ICRAC was observed in all cells and this was accompanied by large Ca2+ influx. The ability of a receptor to evoke Ca2+ entry is determined, at least in part, by protein kinase C. Antigen stimulation, which triggers secretion through a process that requires Ca2+ influx, activated ICRAC. The regulation of ICRAC by protein kinase will therefore have important consequences on cell functioning.

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Selected References

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