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Active chloride secretion by rabbit colon: Calcium-dependent stimulation by ionophore A23187

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Summary

Addition of Ca ionophore, A23187, to the solution bathing the mucosal surface of descending rabbit colon resulted in a reversal of active Cl absorption to active Cl secretion, a twofold increase in short-circuit current and a 40% increase in tissue conductance without affecting the rate of active Na absorption. These alterations in electrolyte transport are quantitatively similar to those previously observed in response to cyclic 3′,5′-AMP (cAMP) (R.A. Frizzell, M.J. Koch & S.G. Schultz,J. Membrane Biol. 27:297, 1976). When medium Ca concentration was reduced to 10−6 m, the secretory response to A23187 was abolished but the response to cAMP was unaffected. The ionophore did not influence the cAMP levels of colonic mucosa. Addition of cyclic AMP to colonic strips preloaded with45Ca elicited a reversible increase in Ca efflux from the tissue. These results suggest that an increase in intracellular Ca concentration stimulates colonic electrolyte secretion and that the secretory response to cAMP may be due, at least in part, to a release of Ca from intracellular stores.

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  1. Department of Physiology, University of Pittsburgh School of Medicine, 15261, Pittsburgh, Pa.

    Raymond A. Frizzell

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Frizzell, R.A. Active chloride secretion by rabbit colon: Calcium-dependent stimulation by ionophore A23187. J. Membrain Biol. 35, 175–187 (1977). https://doi.org/10.1007/BF01869948

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  • DOI: https://doi.org/10.1007/BF01869948

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