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Am J Physiol Endocrinol Metab 276: E295-E302, 1999;
0193-1849/99 $5.00
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Vol. 276, Issue 2, E295-E302, February 1999

Differential effect of amino acid infusion route on net hepatic glucose uptake in the dog

Mary Courtney Moore1, Po-Shiuan Hsieh1, Paul J. Flakoll2, Doss W. Neal2, and Alan D. Cherrington1,2

1 Department of Molecular Physiology and Biophysics, and 2 Diabetes Research and Training Center, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-6015

Concomitant portal infusion of gluconeogenic amino acids (GNGAA) and glucose significantly reduces net hepatic glucose uptake (NHGU), in comparison with NHGU during portal infusion of glucose alone. To determine whether this effect on NHGU is specific to the portal route of GNGAA delivery, somatostatin, intraportal insulin (3-fold basal) and glucagon (basal), and intraportal glucose (to increase the hepatic glucose load by ~50%) were infused for 240 min. GNGAA were infused peripherally into a group of dogs (PeAA), at a rate to match the hepatic GNGAA load in a group of dogs that were given the same GNGAA mixture intraportally (PoAA) at 7.6 µmol · kg-1 · min-1 (9). The arterial blood glucose concentrations and hepatic glucose loads were the same in the two groups, but NHGU (-0.9 ± 0.2 PoAA and -2.1 ± 0.5 mg · kg-1 · min-1 in PeAA, P < 0.05) and net hepatic fractional extraction of glucose (2.6 ± 0.7% in PoAA vs. 5.9 ± 1.4% in PeAA, P < 0.05) differed. Neither the hepatic loads nor the net hepatic uptakes of GNGAA were significantly different in the two groups. Net hepatic glycogen synthesis was ~2.5-fold greater in PeAA than PoAA (P < 0.05). Intraportal, but not peripheral, amino acid infusion suppresses NHGU and net hepatic glycogen synthesis in response to intraportal glucose infusion.

liver; hyperglycemia; liver nerves; glycogen; portal vein


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