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1 Department of Molecular Physiology and Biophysics and 2 Diabetes Research and Training Center, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
We tested the
hypothesis that the loss of hepatic nerves decreases peripheral insulin
sensitivity. Surgical hepatic denervation (DN) was performed in 22 dogs
~16 days before study; 7 dogs (Sham-Sal) had a sham procedure. A
euglycemic hyperinsulinemic (1 mU · kg
1 · min
1; arterial
insulin 35 ± 1 µU/ml in all dogs) clamp was performed in
conscious dogs. From 0 to 90 min of the clamp, all dogs received the
same treatment; then the DN dogs were divided into three groups. From
90 to 180 min, DN-PeA (n = 7) and DN-PoA
(n = 7) groups received acetylcholine 2.5 µg · kg
1 · min
1 via
peripheral or portal vein, respectively, and DN-Sal (n = 8) received no acetylcholine. During 150-180 min, the Sham-Sal, DN-Sal, DN-PeA, and DN-PoA groups exhibited glucose infusion rates of
12.4 ± 0.8, 9.3 ± 0.8 (P < 0.05 vs.
Sham-Sal), 9.1 ± 0.1 (P < 0.05 vs. Sham-Sal),
and 12.7 ± 1.6 mg · kg
1 · min
1; nonhepatic
glucose uptakes of 11.5 ± 0.9, 8.9 ± 0.7 (P < 0.05 vs. Sham-Sal), 8.6 ± 0.9 (P < 0.05 vs.
Sham-Sal), and 11.9 ± 1.7 mg · kg
1 · min
1; net
hindlimb glucose uptakes of 18.4 ± 2.1, 13.7 ± 1.1 (P
< 0.05 vs. Sham-Sal), 17.5 ± 1.9, and 16.7 ± 3.2 mg/min; and glucose utilization rates of 14.4 ± 1.4, 10.4 ± 0.8 (P < 0.05 vs. Sham-Sal), 9.8 ± 0.9 (P
< 0.05 vs. Sham-Sal), and 13.6 ± 1.8 mg · kg
1 · min
1,
respectively. DN caused peripheral insulin resistance, and intraportal but not peripheral acetylcholine restored insulin sensitivity.
hepatic nerves; acetylcholine
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