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Ellagic acid: Insights into its neuroprotective and cognitive enhancement effects in sporadic Alzheimer's disease.
Pharmacology, Biochemistry, and Behavior 2018 December
Sporadic Alzheimer's disease (SAD), an age-associated dementia, is described as neuronal loss and marked cognitive impairment. Ellagic acid (EA) is a phenolic phytoconstituent obtained from grains and fruits, having evident antioxidant effects and known to modulate several endogenous molecular signals in humans in a beneficial way. The current study evaluated the safety profile of EA in the SH-SY5Y human neuroblastoma cell line, performing anti-oxidative effect by DPPH assay, and evaluating anti-AchE (acetylcholinesterase) effect against AchE enzyme from Electrophorus electricus. The observations were further confirmed by in vivo therapeutic effects in streptozotocin (STZ)-induced SAD rats in the context of altered biochemical and behavioral features. Treatment with EA (50 mg/kg, p.o.) for 30 days revealed reduction in STZ (3 mg/kg i.c.v.) prompted SAD and associated biochemical abnormalities in experimental rats which included diminished oxidative stress profile, pro-inflammatory markers i.e. GFAP and CRP; AchE level, and amyloid-β plaque level. Moreover, an elevated level of synaptophysin indicated improved synaptic connectivity, and intact neural architecture showed neuroprotection in the EA group. Furthermore, the behavioral investigation by maze paradigms revealed reduced locomotor behavior, irregular spontaneous alternation, declination in memory score and increased memory errors in SAD rats. EA treatment normalized these SAD-associated abnormal behavioral representations in rats. Hence our findings suggest neuroprotective effects of EA and improvement in cognitive behavior in SAD rats.
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