Antiamnesic effect of stevioside in scopolamine-treated rats

The present study was undertaken to explore the potential of Stevioside in memory dysfunction of rats. Memory impairment was produced by Scopolamine (0.5 mg/kg, i.p.) in animals. Morris water-maze test was employed to assess learning and memory. Brain acetylcholinestrase enzyme (AChE) activity was measured to assess central cholinergic activity. The levels of brain thio-barbituric acid reactive species (TBARS) and reduced glutathione (GSH) were estimated to assess degree of oxidative stress. Scopolamine administration induced significant impairment of learning and memory in rats as indicated by marked decrease in Morris water-maze performance. Scopolamine administration also produced a significant enhancement of brain AChE activity and brain oxidative stress (increase in TBARS & decrease in GSH) levels. Pretreatment of Stevioside (250mg/kg dose orally) significantly reversed Scopolamine induced learning & memory deficits along with attenuation of Scopolamine induced rise in brain AChE activity and brain oxidative stress levels. It may be concluded that Stevioside exerts memory preservative effect in cognitive deficits of rats possibly through its multiple actions.<br />