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Diabetes and Vascular Disease Research
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Antioxidant effects of a grape seed extract in a rat model of diabetes mellitus

Irina C. Chis

Department of Physiology, 'Iuliu Hatieganu' University of Medicine and Pharmacy, Cluj-Napoca, Romania, irinnaus{at}yahoo.com

Marius I. Ungureanu

Department of Physiology, 'Iuliu Hatieganu' University of Medicine and Pharmacy, Cluj-Napoca, Romania

Adriana Marton

Department of Physiology, 'Iuliu Hatieganu' University of Medicine and Pharmacy, Cluj-Napoca, Romania

Ramona Simedrea

Department of Physiology, 'Iuliu Hatieganu' University of Medicine and Pharmacy, Cluj-Napoca, Romania

Adriana Muresan

Department of Physiology, 'Iuliu Hatieganu' University of Medicine and Pharmacy, Cluj-Napoca, Romania

Ion-Dan Postescu

'Prof. I. Chiricuta' Oncology Institute, Cluj-Napoca, Romania

Nicoleta Decea

Department of Physiology, 'Iuliu Hatieganu' University of Medicine and Pharmacy, Cluj-Napoca, Romania

In the present study we investigated the anti-hyperglycaemic and antioxidant effect of grape seed extract, a polyphenolic flavonoid, in normal and streptozotocin-induced diabetic Wistar rats. Adult male Wistar rats were divided into three groups: Group I: non-diabetic control; Group II: diabetic control; Group III: diabetic rats treated with grape seed extract, administered via an intragastric tube (0.6 ml/rat), at a dose of 100 mg/kg for 20 consecutive days after the induction of diabetes mellitus. Diabetes was induced by an i.p. injection with streptozotocin for groups II and III.TheTBARS, carbonylated proteins, were measured in the plasma and in the supernatant of liver homogenisates, and superoxide dismutase and catalase were measured in the haemolysates of RBCs and supernatant of liver homogenisates. The results showed that oral administration of grape seed extract (100 mg/kg/day) reduced the levels of lipid peroxides and carbonylated proteins and improved the antioxidant activity in plasma and hepatic tissue in rats treated with grape seed natural extract as compared with the diabetic control rats. These results suggested that the grape seed extract enhanced the antioxidant defence against reactive oxygen species produced under hyperglycaemic conditions, hence protecting the liver cells.

Key Words: diabetes mellitus • Reactive Oxygen Species • lipid peroxides • carbonylated proteins • CAT • SOD • polyphenols • streptozotocin

Diabetes and Vascular Disease Research, Vol. 6, No. 3, 200-204 (2009)
DOI: 10.1177/1479164109336692
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