ISSN:
1432-1424
Keywords:
amino-acid transport
;
insulin
;
diabetes
;
calcium dependency
;
ouabain
;
2-methylaminoisobutyric acid
;
exocrine pancreas
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01869241
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