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Nutr Metab Cardiovasc Dis. 2008 Jan;18(1):15-22. Epub 2007 Oct 18.

A study on the action of vitamin E supplementation on plasminogen activator inhibitor type 1 and platelet nitric oxide production in type 2 diabetic patients.

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  • 1Institute of Biochemistry, School of Medicine, Polytechnic University of Marche, Via P. Ranieri 65, 60131 Ancona, Italy. vignini2@libero.it

Abstract

BACKGROUND AND AIM:

Type 2 diabetic (T2DM) patients show decreased fibrinolysis, mainly linked to high plasminogen activator inhibitor type 1 (PAI-1) production, together with a reduced bioavailability of nitric oxide and an impairment in Na(+)/K(+)-ATPase activity possibly involved in increased cardiovascular risk. Vitamin E is the major natural lipid-soluble antioxidant in human plasma. The present work was conducted in order to measure PAI-1, ICAM and VCAM-1 plasma levels, platelet nitric oxide production and membrane Na(+)/K(+)-ATPase activity in type 2 diabetic subjects treated with vitamin E (500 IU/day) for 10 weeks and then followed for other 20 weeks.

METHODS AND RESULTS:

Thirty-seven T2DM patients (24 males and 13 females) were studied. None of them were affected by any other disease or diabetic complications. Significant differences were detected for PAI-1 antigen (p<0.001), PAI-1 activity (p<0.001), nitric oxide (NO) production (p<0.001), and Na(+)/K(+)-ATPase activity (p<0.001) among the 4 phases of the study. A significant decrease both in ICAM and VCAM-1 plasma levels was also found at the 10th week compared with baseline (respectively p<0.001 and p<0.05).

CONCLUSION:

Our data suggest that vitamin E counteracts endothelial activation in T2DM patients possibly representing a new tool for endothelial protection.

PMID:
17949955
[PubMed - indexed for MEDLINE]
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