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BackgroundAlbizia adianthifolia (Schumach.) W. Wright (Fabaceae) is a traditional herb largely used in the African traditional medicine as analgesic, purgative, anti-inflammatory, antioxidant, antimicrobial and memory-enhancer drug. This study was undertaken in order to evaluate the possible cognitive-enhancing and antioxidative effects of the aqueous extract of A. adianthifolia leaves in the 6-hydroxydopamine-lesion rodent model of Parkinson's disease.MethodsThe effect of the aqueous extract of A. adianthifolia leaves (150 and 300 mg/kg, orally, daily, for 21 days) on spatial memory performance was assessed using Y-maze and radial arm-maze tasks, as animal models of spatial memory. Pergolide-induced rotational behavior test was employed to validate unilateral damage to dopamine nigrostriatal neurons. Also, in vitro antioxidant activity was assessed through the estimation of total flavonoid and total phenolic contents along with determination of free radical scavenging activity. Statistical analyses were performed using two-way analysis of variance (ANOVA). Significant differences were determined by Tukey's post hoc test. F values for which pResultsThe 6-OHDA-treated rats exhibited the following: decrease of spontaneous alternations percentage within Y-maze task and increase of working memory errors and reference memory errors within radial arm maze task. Administration of the aqueous extract of A. adianthifolia leaves significantly improved these parameters, suggesting positive effects on spatial memory formation. Also, the aqueous extract of A. adianthifolia leaves showed potent in vitro antioxidant activity. Furthermore, in vivo evaluation, the aqueous extract of A. adianthifolia leaves attenuated the contralateral rotational asymmetry observed by pergolide challenge in 6-OHDA-treated rats.ConclusionsTaken together, our results suggest that the aqueous extract of A. adianthifolia leaves possesses antioxidant potential and might provide an opportunity for management neurological abnormalities in Parkinson's disease conditions.
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