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Ionic dependence of amino-acid transport in the exocrine pancreatic epithelium: Calcium dependence of insulin action

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Summary

Rapid unidirectional transport (15 sec) ofl-serine and 2-methylaminoisobutyric acid (MeAIB) was studied in the isolated perfused rat pancreas using a dual-tracer dilution technique. Time-course experiments in the presence of normal cation gradients revealed a time-dependent transstimulation ofl-serine influx and transinhibition of MeAIB influx. Transport of the model nonmetabolized System A analog MeAIB was Na+ dependent and significantly inhibited during perfusion with 1mm ouabain. Although transport ofl-serine was largely Na+ independent, ouabain caused a time-dependent inhibition of transport. Influx of both amino acids appeared to be inhibited by the ionophore monensin but unaffected by a lowered extracellular potassium concentration. Removal of extracellular calcium had no effect on influx of the natural substratel-serine, whereas stimulation of transport by exogenous insulin (100 μU/ml) was entirely dependent upon extracellular calcium and unaffected by ouabain. Paradoxically, exogenous insulin had no effect on the time-course of MeAIB influx. The characteristics ofl-serine influx described in earlier studies together with our present findings suggest that insulin may modulate the activity of System asc in the exocrine pancreatic epithelium by a calcium-dependent mechanism.

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  1. Department of Physiology, King's College, W8 7AH, London, UK

    P. S. R. Norman & G. E. Mann

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Norman, P.S.R., Mann, G.E. Ionic dependence of amino-acid transport in the exocrine pancreatic epithelium: Calcium dependence of insulin action. J. Membrain Biol. 96, 153–163 (1987). https://doi.org/10.1007/BF01869241

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