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. 1976 Aug 15;158(2):211–221. doi: 10.1042/bj1580211

The effect of intracellular calcium ions on adrenaline-stimulated adenosine 3':5'-cyclic monophosphate concentrations in pigeon erythrocytes, studied by using the ionophore A23187.

A K Campbell, K Siddle
PMCID: PMC1163961  PMID: 186033

Abstract

1. The bivalent cation ionophore A23187 was used to increase the intracellular concentration of Ca2+ in pigeon erythrocytes to investigate whether the increase in cyclic AMP content caused by adrenaline might be influenced by a change in intracellular Ca2+ in intact cells. 2. Incubation of cells with adrenaline, in the concentration range 0.55--55 muM, resulted in an increase in the concentration of cyclic AMP over a period of 60 min. The effect of adrenaline was inhibited by more than 90% with ionophore A23187 (1.9 muM) in the presence of 1 mM-Ca2+. This inhibition could be decreased by decreasing either the concentration of the ionophore or the concentration of extracellular Ca2+, and was independent of the concentration of adrenaline. 3. The effect of ionophore A23187 depended on the time of incubation. Time-course studies showed that maximum inhibition by ionophore A23187 was only observed when the cells were incubated with the ionophore for at least 15 min before the addition of adrenaline. 4. The inhibition by ionophore A23187 depended on the concentration of extracellular Ca2+. In the absence of Mg2+, ionophore A23187 (1.9 muM) inhibited the effect of adrenaline by approx. 30% without added Ca2+, by approx. 66% with 10 muM-Ca2+ and by more than 90% with concentrations of added Ca2+ greater than 30 muM. However, even in the presence of EGTA [ethanedioxybis(ethylamine)tetra-acetate](0.1--10 mM), ionophore A23187 caused an inhibition of the cyclic AMP response of at least 30%, which may have been due to a decrease in cell Mg2+ concentration. 5. The addition of EGTA after incubation of cells with ionophore A23187 resulted in a partial reversal of the inhibition of the effect of adrenaline. 6. Inclusion of Mg2+ (2 mM) in the incubation medium antagonized the inhibitory action of ionophore A23187. This effect was most marked when the ionophore A23187 was added to medium containing Mg2+ before the addition of the cells. 7. The cellular content of Mg2+ was decreased by approx. 50% after 20 min incubation with ionophore A23187 (1.9 muM) in the presence of Ca2+ (1 mM) but no Mg2+. When Mg2+ (2 mM) was also present in the medium, ionophore A23187 caused an increase of approx. 80% in cell Mg2+ content. Ionophore A23187 had no significant effect on cell K+ content. 8. Ionophore A23187 caused a decrease in cell ATP content under some conditions. Since effects on cyclic AMP content could also be shown when ATP was not significanlty lowered, it appeared that a decrease in ATP in the cells could not explain the effect of ionophore A23187 on cyclic AMP. 9. Ionophore A23187 (1.9 muM), with 1 mM-Ca2+, did not enhance cyclic AMP degradation in intact cells, suggesting that the effect of ionophore A23187 on cyclic AMP content was mediated through an inhibition of adenylate cyclase rather than a stimulation of cyclic AMP phosphodiesterase. 10. It was concluded that in intact pigeon erythrocytes adenylate cyclase may be inhibited by intracellular concentrations of Ca2+ in the range 1-10 muM.

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Selected References

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