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Protective effect of Wormwood extract on lead induced neurotoxicity and cognitive disorder

Keywords: Acetylcholinesterase activity , behavioural , Brain region , Lead acetate , monoamine oxidase activity

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Abstract:

Lead is a ubiquitous and a potent neurotoxicant causes several neurophysiological and behavioural alterations. Considering the vulnerability of the developing brain to Pb neurotoxicity, this study was carried out to investigate the effects of Pb exposure on brain regions acetylcholinesterase (AchE) and monoamino oxidase (MAO) enzymes activities and on behavioural changes. Wister rat were exposed to 750 ppm of lead acetate in the drinking water for 11-weeks after weaning, and treated by Artemisia Absinthium L. (wormwood) extract (200 mg.kg-1 body weight) for 4 weeks. The activities of AchE and MAO were determined in the hypothalamus, hippocampus, cortex and striatum of male rat; and general/ Locomotors activity was evaluated in the open-field test. Results indicated a significant decrease in AchE activity in intoxicated group (Pb) compared to untreated group (as contral) (hypothalamus: -12%, hippocampus: -57%, cerebral cortex: -18% and striatum: -43%) and in MAO activity (hypothalamus: -29%, hippocampus: -41%, cerebral cortex: -28% and striatum: -51%) respectively, with decrease crossing test score and increase sniffing test score. After, wormwood extract administration, the activity of AchE and MAO were significantly increased in all brain region compared to Pb group, but were significantly lower than control. The locomotors activity was reduced compared to Pb group. These data suggest that administration of wormwood extract for 4 weeks protect against the lead acetate-induced change in behavioural and neurobiochemical parameters changes.

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