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Cardiovascular Toxicology 2008-Mar

Severe impairment of endothelial function with the HIV-1 protease inhibitor indinavir is not mediated by insulin resistance in healthy subjects.

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Michael P Dubé
Jude Christopher Gorski
Changyu Shen

Ключови думи

Резюме

Endothelial dysfunction may contribute to increased cardiovascular events among HIV-1-infected patients receiving antiretroviral therapy. The HIV-1 protease inhibitor indinavir causes both vascular dysfunction and insulin resistance, but the relationship between the two disturbances is not established. Endothelium-dependent vasodilation (EDV), insulin-mediated vasodilation (IMV), and whole body and leg glucose uptake during a euglycemic hyperinsulinemic clamp (40 mU/m(2)/min) were measured before and after four weeks of indinavir in nine healthy men. EDV fell from 270 +/- 67% above basal to 124 +/- 30% (P = 0.04) and IMV from 56 +/- 14% above basal to 8 +/- 8% (P = 0.001) with indinavir. During the clamp, arteriovenous glucose difference and leg glucose uptake were not significantly different after indinavir and whole-body glucose uptake was only modestly reduced (8.0 +/- 0.8 vs. 7.2 +/- 0.8 mg/kg/min, P = 0.04). The change in EDV did not correlate with the change in whole-body glucose uptake after indinavir (r = 0.21, P = 0.6). Despite marked impairment of endothelial function and IMV with indinavir, only modest, inconsistent reductions in measures of insulin-stimulated glucose uptake occurred. This suggests that indinavir's effects on glucose metabolism are not directly related to indinavir-associated endothelial dysfunction. Studies of the vascular effects of newer protease inhibitors are needed.

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