PMID: 8603767Apr 1, 1996Paper

Hepatic glucose production is regulated both by direct hepatic and extrahepatic effects of insulin in humans

Diabetes
G F LewisA Giacca

Abstract

The present study examines the effect of the route of insulin delivery on glucose turnover in humans. By using a new noninvasive in vivo method, the acute effect of insulin secreted by the pancreas can be compared with that of insulin delivered by a peripheral vein. Three euglycemic-hyperinsulinemic studies were performed in lean healthy men. In the first study (n = 10), constant portal hyperinsulinemia was produced using a programmed intravenous tolbutamide infusion algorithm, and the insulin secretion rate was mathematically derived by deconvolution from peripheral plasma C-peptide levels. In the second study (n = 10), exogenous insulin was infused by peripheral vein at the same rate as that determined in the first study. In the third study (n = 7), the peripheral insulin levels in the first study were matched by infusing exogenous insulin into a peripheral vein at half that rate. Peripheral insulin levels were higher (P < 0.001) with the full-rate peripheral insulin infusion (266.3 +/- 28.1 pmol/l) than with the portal delivery of insulin (171.1 +/- 30.4 pmol/l) or the half-rate peripheral insulin infusion (158.6 +/- 7.4 pmol/l) (portal versus half-rate peripheral insulin infusion, NS). Calculated hepatic insulin levels were...Continue Reading

Citations

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