SUMMARY
The present investigation shows the antihyperglycaemic activity of aqueous extract of bark of
Helicteres isora L. (100, 200 mg/kg b.w./p.o.) in streptozotocin (STZ) induced diabetic rats. Blood
glucose levels, body weight, food and liquid intake were measured on every 5th day over a period
of 14 days. A single injection of STZ at a dose of 60 mg/kg b.w./i.p. elevated the glucose levels
>240mg/dl after 5 days. Administration of H. isora at a dose of 100, 200 mg/kg/p.o. resulted in a
significant (p<0.05) reduction in blood glucose levels. Body weights were significantly (p<0.05)
reduced in STZ-induced diabetic rats when compared to normal rats while the extract significantly
(p<0.05) prevented a decrease in body weight in the H. isora treated animals. The study also
evaluated the antioxidant potential of H. isora in STZ-induced diabetic rats. Decreased levels of
thiobarbituric acid reactive substances (TBARS), increased levels of reduced glutathione (GSH) and
the activities of superoxide dismutase (SOD) and catalase (CAT) resulted in the reduction of free
radical formation in various tissues such as liver, kidney, and brain of the diabetic rats. Tolbutamide
was used as a standard reference drug. The results clearly indicate that the aqueous extract of bark
of H. isora exhibits significant antihyperglycaemic and in vivo antioxidant activity in STZinduced
diabetic rats and the results were found to be dose dependent.
KEY WORDS
Helicteres isora; streptozotocin; antihyperglycaemic activity; antioxidant potential
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