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Calcium ion uptake induced by cholinergic and α-adrenergic stimulation in isolated cells of rat salivary glands

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Summary

Adrenaline (10−5 M) and carbamylcholine (10−4 M) stimulate45Ca2+ uptake into isolated cells of rat submandibular gland and parotid glands. In the presence of the α-adrenoreceptor blocking agent phentolamine, adrenaline stimulation of45Ca2+ uptake is abolished. The β-adrenergic stimulant isoproterenol has no effect on45Ca2+ uptake. Carbamylcholine induced45Ca2+ uptake is inhibited by atropine. The Ca2+ ionophore A23187 stimulates45Ca2+ uptake, whereas dibutyryl cyclic adenosine 3′,5′-monophosphate and dibutyryl cyclic guanosine 3′,5′-monophosphate have no effect on45Ca2+ uptake.

A graphical analysis of the45Ca2+ uptake curves reveals at least two phases: a fast phase and a slow phase, both of which are stimulated by adrenaline and carbamylcholine.

The45Ca-exchangeable pool size is increased by adrenaline and carbamylcholine in both the fast and the slow phases.

These results suggest that α-adrenergic and cholinergic agonists act by increasing the rate of Ca2+ transfer into the cells of the parotid and submandibular salivary glands most probably through an increase of the cell membrane permeability for Ca2+.

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Supported by Swiss National Science Foundation Grant No. 3.298.074

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Koelz, H.R., Kondo, S., Blum, A.L. et al. Calcium ion uptake induced by cholinergic and α-adrenergic stimulation in isolated cells of rat salivary glands. Pflugers Arch. 370, 37–44 (1977). https://doi.org/10.1007/BF00707943

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