Glucose potentiation of arginine-induced insulin secretion is impaired in subjects with a glucokinase Glu256Lys mutation.

Abstract:

:Insulin and glucagon release and insulin sensitivity were investigated in patients with glucokinase deficiency. Five subjects with a missense mutation (Glu256Lys) were studied. They were compared with six healthy subjects with low insulin response but normal glucose tolerance. Insulin and glucagon levels were measured at blood glucose 7.1 +/- 0.1 mmol/l and at 10.9 +/- 0.2 mmol/l with or without arginine (5 g i.v.). Insulin sensitivity was assessed as the ratio between infused glucose and the insulin level (M:I) during hyperglycemic clamps. Glu256Lys subjects were nonobese and had fasting blood glucose 6.7 +/- 0.1 mmol/l (P < 0.001 vs. control group). Insulin release was reduced in response to 11 mmol/l glucose (61% of control group, P < 0.05) as well as to arginine in the presence of 11 mmol/l glucose (54% of control group, P < 0.01). Also, the slope of potentiation, i.e., the enhancement of arginine-induced release as a function of prevailing glucose concentration, was reduced (delta insulin/delta glucose, 47% of control group, P < 0.05). As for glucagon release, the response to arginine was not inhibited normally by glucose, resulting in threefold higher levels at 11 mmol/l glucose versus control subjects. Insulin sensitivity, assessed as M:I, was significantly (P < 0.05) reduced (55% of control group). Glucokinase deficiency thus affects not only insulin responses to glucose per se but also glucose potentiation of responses to non-nutrient secretagogues. Abnormalities in glucagon release and insulin sensitivity coexist with attenuated insulin responses in glucokinase-deficient subjects.

journal_name

Diabetes

journal_title

Diabetes

authors

Wajngot A,Alvarsson M,Glaser A,Efendic S,Luthman H,Grill V

doi

10.2337/diab.43.12.1402

subject

Has Abstract

pub_date

1994-12-01 00:00:00

pages

1402-6

issue

12

eissn

0012-1797

issn

1939-327X

journal_volume

43

pub_type

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