Summary
We have measured the effects of the carboxylic Ca++ ionophore A23187 on muscle tension, resting potential and 3-O-methylglucose efflux. The ionophore produces an increase in tension that is dependent on external Ca++ concentration since (a) the contracture was blocked by removing external Ca++ and (b) its size was increased by raising outside Ca++. Neither resting potential nor resting and insulin-stimulated sugar efflux were modified by the ionophore. These data imply that the action of insulin is not mediated by increasing cytoplasmic [Ca++]. Additional support for this conclusion was obtained by testing the effects of caffeine on sugar efflux. This agent, which releases Ca++ from the reticulum, did not increase resting sugar efflux and inhibited the insulin-stimulated efflux. Incubation in solutions containing butyrated derivatives of cyclic AMP or cyclic GMP plus theophylline did not modify the effects of insulin on sugar efflux. Evidence suggesting that our experimental conditions increased the cytoplasmic cyclic AMP activity was obtained.
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Grinstein, S., Erlij, D. Action of insulin and cell calcium: Effect of ionophore A23187. J. Membrain Biol. 29, 313–328 (1976). https://doi.org/10.1007/BF01868968
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DOI: https://doi.org/10.1007/BF01868968