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. 1995 Jul;96(1):132–140. doi: 10.1172/JCI118013

In vivo glucosamine infusion induces insulin resistance in normoglycemic but not in hyperglycemic conscious rats.

L Rossetti 1, M Hawkins 1, W Chen 1, J Gindi 1, N Barzilai 1
PMCID: PMC185181  PMID: 7615783

Abstract

To test the hypothesis that increased flux through the hexosamine biosynthetic pathway can induce insulin resistance in skeletal muscle in vivo, we monitored glucose uptake, glycolysis, and glycogen synthesis during insulin clamp studies in 6-h fasted conscious rats in the presence of a sustained (7-h) increase in glucosamine (GlcN) availability. Euglycemic (approximately 7 mM) insulin (approximately 2,500 pM) clamps with saline or GlcN infusions were performed in control (CON; plasma glucose [PG] = 7.4 +/- 0.2 mM), diabetic (D; PG = 19.7 +/- 1.1), and phlorizin-treated (3-wk) diabetic rats (D + PHL; PG = 7.6 +/- 0.9). 7-h euglycemic hyperinsulinemia with saline did not significantly decrease Rd (360-420 min = 39.2 +/- 3.6 vs. 60-120 min = 42.2 +/- 3.7 mg/kg.min; P = NS). GlcN infusion raised plasma GlcN concentrations to approximately 1.2 mM and increased muscle and liver UDP-GlcNAc levels by 4-5-fold in all groups. GlcN markedly decreased Rd in CON (360-420 min = 30.4 +/- 1.3 vs. 60-120 min = 44.1 +/- 3.5 mg/kg.min; P < 0.01) and D + PHL (360-420 min = 29.4 +/- 2.5 vs. 60-120 min = 43.8 +/- 2.9 mg/kg.min; P < 0.01), but not in D (5-7 h = 21.5 +/- 0.8 vs. 0-2 h = 24.3 +/- 1.1 mg/kg.min; P = NS). Thus, increased GlcN availability induces severe skeletal muscle insulin resistance in normoglycemic but not in chronically hyperglycemic rats. The lack of additive effects of GlcN and chronic hyperglycemia (experimental diabetes) provides support for the hypothesis that increased flux through the GlcN pathway in skeletal muscle may play an important role in glucose-induced insulin resistance in vivo.

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Selected References

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