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Cardiovascular Research 2000 47(3):457-464; doi:10.1016/S0008-6363(00)00054-7
© 2000 by European Society of Cardiology
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Copyright © 2000, European Society of Cardiology

Antioxidants, diabetes and endothelial dysfunction

D.W. Laight*, M.J. Carrier and E.E. Änggård

The William Harvey Research Institute, St. Bartholomew's and the Royal London School of Medicine and Dentistry, Charterhouse Square, London EC1 6BQ, UK

* Corresponding author. Tel.: +44-171-982-6037; fax: +44-171-982-6016 d.w.laight{at}mds.qmw.ac.uk

While a damaged endothelium is recognised to be a key accessory to diabetic macroangiopathy, awareness is developing that impairments concerning endothelium- and nitric oxide (NO)-dependent microvascular function, may contribute to several other corollaries of diabetes, such as hypertension, dyslipidaemia and in vivo insulin resistance. There are now several reports describing elevations in specific oxidant stress markers in both insulin resistance syndrome (IRS) and diabetes, together with determinations of reduced total antioxidant defence and depletions in individual antioxidants. Such a pro-oxidant environment in diabetes may disrupt endothelial function through the inactivation of NO, resulting in the attenuation of a fundamental anti-atherogenic and euglycaemic vascular influence. Indeed, experimental and clinical data suggest that the supplementation of insulin resistant or diabetic states with antioxidants such as vitamin E, normalises oxidant stress and improves both endothelium-dependent vasodilation and insulin sensitivity. However, the promising potential efficacy of antioxidant therapy in cardiovascular disease and diabetes, in either a primary or secondary preventative role, awaits definitive clinical demonstration.

KEYWORDS Blood flow; Diabetes; Endothelial function; Free radicals; Nitric oxide


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