Effect of K+ deprivation and ouabain upon glucagon release.
The effects of K+ depletion and ouabain (0.1, 0.5, and 1 mM) on glucagon and insulin release from the in vitro perfused rat pancreas were studied in the absence or presence of arginine (10 mM). In the absence of arginine, K+ depletion resulted in an inhibition of glucagon release, both at a low (2.8 mM) and a higher (8.3 mM) concentration of glucose, whereas ouabain enhanced glucagon secretion. In the presence of arginine, K+ deprivation induced limited and short lived oscillations in the rate of glucagon release at both low and high glucose levels. In the presence of arginine, ouabain induced first a short lived stimulation and, thereafter, a severe and sustained inhibition of glucagon release. The restoration of the normal K+ concentration or the removal of ouabain was followed by a marked and transient inhibition of glucagon release which was most prominent in the presence of arginine. In agreement with previous investigations, K+ deprivation or ouabain facilitated insulin release evoked by glucose and/or arginine. The results suggest that a primary alteration in K+ availability and/or transport affects in a dual manner the release of glucagon, depending on environmental factors such as the type of stimulus used to activate the secretory process.
D000818:Animals; D005260:Female; D005934:Glucagon / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D007328:Insulin / Q000378:metabolism; D010042:Ouabain / Q000494:pharmacology*; D010179:Pancreas / Q000187:drug effects / Q000378:metabolism*; D011191:Potassium Deficiency / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
D007328:Insulin; D010042:Ouabain; D005934:Glucagon; D005947:Glucose