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- W2021505175 abstract "Overactivity of the hexosamine biosynthetic pathway may underlie hyperglycemia-associated insulin resistance, but to date human studies are lacking. Hexosamine pathway activation can be mimicked by glucosamine (GlcN). In the present placebo-controlled study we determined whether GlcN infusion affects insulin resistance in vivo. In 18 healthy subjects, we applied the double forearm balance technique (infused arm vs. control arm) combined with the euglycemic hyperinsulinemic clamp (60 mU/m(2).min insulin) for at least 300 min. During the clamp, subjects received infusions in the brachial artery of 4 micromol/dL.min GlcN from 90-240 min (n = 6) or from 0-300 min (n = 6) or saline (placebo; n = 6). We studied the effects of GlcN on forearm glucose uptake (FGU; infused arm vs. control arm, and vs. placebo experiments) and on whole body glucose uptake. GlcN infusion raised the plasma GlcN concentration in the infusion arms to 0.42 +/- 0.14 and 0.81 +/- 0.46 mmol/L; plasma GlcN remained very low (< 0.07 mmol/L) in the control arms and in the placebo group. GlcN infusion did not change forearm blood flow. During insulin, FGU increased more than 10-fold. At all time points, FGU was similar in the GlcN-infused arm compared with the control arm and was not different from FGU in the placebo experiments. Similar results were obtained for forearm arteriovenous glucose differences or extraction and for whole body glucose uptake. Thus, despite relevant GlcN concentrations for 5 h in the infused forearm, GlcN had no effect on insulin-induced glucose uptake. These results do not support involvement of the hexosamine pathway in the regulation of insulin sensitivity in humans, at least not in the short-term setting." @default.
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- W2021505175 date "2001-05-01" @default.
- W2021505175 modified "2023-10-12" @default.
- W2021505175 title "Short-Term Glucosamine Infusion Does Not Affect Insulin Sensitivity in Humans1" @default.
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- W2021505175 doi "https://doi.org/10.1210/jcem.86.5.7470" @default.
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