Vignini A, Nanetti L, Moroni C, Testa R, Sirolla C, Marra M, Manfrini S, Fumelli D, Marcheselli F, Mazzanti L, Rabini RA. 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.
Nutr Metab Cardiovasc Dis 2008;
18:15-22. [PMID:
17949955 DOI:
10.1016/j.numecd.2007.01.002]
[Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 12/18/2006] [Accepted: 01/04/2007] [Indexed: 11/21/2022]
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.
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