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Diabetes, Vol 49, Issue 4 611-617, Copyright © 2000 by American Diabetes Association
Effect of glucagon-like peptide 1(7-36) amide on glucose effectiveness and insulin action in people with type 2 diabetes
A Vella, P Shah, R Basu, A Basu, JJ Holst and RA Rizza
Department of Internal Medicine, Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA.
Although it is well established that glucagon-like peptide 1(7-36) amide
(GLP-1) is a potent stimulator of insulin secretion, its effects on insulin
action and glucose effectiveness are less clear. To determine whether GLP-1
increases insulin action and glucose effectiveness, subjects with type 2
diabetes were studied on two occasions. Insulin was infused during the
night on both occasions to ensure that baseline glucose concentrations were
comparable. On the morning of study, either GLP-1 (1.2 pmol x kg(-1) x
min(-1)) or saline were infused along with somatostatin and replacement
amounts of glucagon. Glucose also was infused in a pattern mimicking that
typically observed after a carbohydrate meal. Insulin concentrations were
either kept constant at basal levels (n = 6) or varied so as to create a
prandial insulin profile (n = 6). The increase in glucose concentration was
virtually identical on the GLP-1 and saline study days during both the
basal (1.21 +/- 0.15 vs. 1.32 +/- 0.19 mol/l per 6 h) and prandial (0.56
+/- 0.14 vs. 0.56 +/- 0.10 mol/l per 6 h) insulin infusions. During both
the basal and prandial insulin infusions, glucose disappearance promptly
increased after initiation of the glucose infusion to rates that did not
differ on the GLP-1 and saline study days. Suppression of endogenous
glucose production also was comparable on the GLP-1 and saline study days
during both the basal (-2.7 +/- 0.3 vs. -3.1 +/- 0.2 micromol/kg) and
prandial (-3.1 +/- 0.4 vs. -3.0 +/- 0.6 pmol/kg) insulin infusions. We
conclude that when insulin and glucagon concentrations are matched, GLP-1
has negligible effects on either insulin action or glucose effectiveness in
people with type 2 diabetes. These data strongly support the concept that
GLP-1 improves glycemic control in people with type 2 diabetes by
increasing insulin secretion, by inhibiting glucagon secretion, and by
delaying gastric emptying rather than by altering extrapancreatic glucose
metabolism.

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Copyright © 2000 by the American Diabetes Association.
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