Reduction of the cytosolic calcium activity in clonal insulin-releasing cells exposed to glucose.
The cytosolic Ca2+ activity of insulin-releasing clonal cells (RINm5F) was studied with the intracellular fluorescent indicator quin-2. When the extracellular Ca2+ concentration was 1 mM, the basal cytosolic Ca2+ activity was 101 +/- 5 nM. Depolarization with 25 mM K+ increased this Ca2+ activity to at least 318 nM, an effect completely reversed by the voltage-dependent channel blocker D-600. In the presence of K+ alone these channels appeared to have a half-life of 6.7 +/- 0.8 min. In contra...Expand abstract
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