title: Stimulatory effects of tolbutamide infusion on plasma glucagon in insulin-dependent diabetic subjects.
abstract: The effect of iv tolbutamide on endogenous glucagon levels was measured in nine insulin-dependent diabetic patients chosen because they evidenced no C-peptide response to beta-cell secretagogues. Basal glucagon levels were not suppressed by a sustained tolbutamide infusion; in fact, a slight stimulatory effect was observed at 5, 10, 30, and 45 min. In the absence of detectable insulin secretory capacity and suboptimal insulin replacement, tolbutamide appears to be a stimulus, not a suppressant, of glucagon secretion.
mesh_terms: D000328:Adult; D001786:Blood Glucose / Q000378:metabolism; D002096:C-Peptide / Q000097:blood; D003920:Diabetes Mellitus / Q000097:blood*; D005260:Female; D005934:Glucagon / Q000097:blood*; D006801:Humans; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D014044:Tolbutamide / Q000494:pharmacology*
chemical_list: D001786:Blood Glucose; D002096:C-Peptide; D005934:Glucagon; D014044:Tolbutamide