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Sökning: WFRF:(Sjoholm A)

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  • Nystrom, T, et al. (författare)
  • Tetrahydrobiopterin increases insulin sensitivity in patients with type 2 diabetes and coronary heart disease
  • 2004
  • Ingår i: American journal of physiology. Endocrinology and metabolism. - : American Physiological Society. - 0193-1849 .- 1522-1555. ; 287:5, s. E919-E925
  • Tidskriftsartikel (refereegranskat)abstract
    • Tetrahydrobiopterin (BH4) is an essential cofactor of nitric oxide synthase that improves endothelial function in diabetics, smokers, and patients with hypercholesterolemia. Insulin resistance has been suggested as a contributing factor in the development of endothelial dysfunction via an abnormal pteridine metabolism. We hypothesized that BH4 would restore flow-mediated vasodilation (FMD, endothelial-dependent vasodilation), which may affect insulin resistance in type 2 diabetic patients. Thirty-two subjects (12 type 2 diabetic subjects, 10 matched nondiabetic subjects, and 10 healthy unmatched subjects) underwent infusion of BH4 or saline in a random crossover study. Insulin sensitivity index (SI) was measured by hyperinsulinemic isoglycemic clamp. FMD was measured using ultrasonography. BH4 significantly increased SI in the type 2 diabetics [3.6 ± 0.6 vs. 4.9 ± 0.7 × 10−4 dl·kg−1·min−1/(μU/ml), P < 0.05], while having no effects in nondiabetics [8.9 ± 1.1 vs. 9.0 ± 0.9 × 10−4 dl·kg−1·min−1/(μU/ml), P = 0.92] or in healthy subjects [17.5 ± 1.6 vs. 18 ± 1.8 × 10−4 dl·kg−1·min−1/(μU/ml), P = 0.87]. BH4 did not affect the relative changes in brachial artery diameter from baseline FMD (%) in type 2 diabetic subjects (2.3 ± 0.8 vs. 1.8 ± 1.0%, P = 0.42), nondiabetic subjects (5.3 ± 1.1 vs. 6.6 ± 0.9%, P = 0.32), or healthy subjects (11.9 ± 0.6 vs. 11.0 ± 1.0%, P = 0.48). In conclusion, BH4 significantly increases insulin sensitivity in type 2 diabetic patients without any discernible improvement in endothelial function.
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