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Diabetes, Vol 48, Issue 1 94-98, Copyright © 1999 by American Diabetes Association
Surgical removal of visceral fat reverses hepatic insulin resistance
N Barzilai, L She, BQ Liu, P Vuguin, P Cohen, J Wang and L Rossetti
Department of Medicine, and Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, New York 10461, USA. barzilai@aecom.yu.edu
We directly examined whether visceral fat (VF) modulates hepatic insulin
action by randomizing moderately obese (body wt approximately 400 g)
Sprague-Dawley rats to either surgical removal of epididymal and
perinephric fat pads (VF-; n = 9) or a sham operation (VF+; n = 11). Three
weeks later, total VF was fourfold increased (8.5 +/- 1.2 vs. 2.1 +/- 0.3
g, P < 0.001) in the VF+ compared with the VF- group, but whole-body fat
mass (determined using 3H2O) was not significantly different. The rates of
insulin infusion required to maintain plasma glucose levels and basal
hepatic glucose production in the presence of hepatic-pancreatic clamp were
markedly decreased in VF- compared with VF+ rats (0.57 +/- 0.02 vs. 1.22
+/- 0.19 mU x kg(-1) x min(-1), P < 0.001). Similarly, plasma insulin
levels were more than twofold higher in the VF+ group (P < 0.001). The
heightened hepatic insulin sensitivity is supported by the decrease in gene
expression of both glucose-6-phosphatase and PEPCK and by physiological
hyperinsulinemia in VF- but not VF+ rats. The improvement in hepatic
insulin sensitivity in VF- rats was also supported by a approximately 70%
decrease in the plasma levels of insulin-like growth factor binding
protein-1, a marker of insulin's transcription regulation in the liver. The
removal of VF pads also resulted in marked decreases in the gene expression
of tumor necrosis factor-alpha (by 72%) and leptin (by 60%) in subcutaneous
fat. We conclude that visceral fat is a potent modulator of insulin action
on hepatic glucose production and gene expression.

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