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Abstract:   (79 Views)
Introduction: Chronic stress is related to cognitive impairment. Azadirachta indica A. Juss. (A. indica) leaf extract possesses antioxidants and cognitive enhancement. Therefore, this study was set up to evaluate cognitive enhancing effects of A. indica flower extract in the stressed rats.
Methods: Male Wistar rats were randomly divided into control and stress groups. The stress groups were induced restrain stress for 3 h daily. The stressed rats were given vehicles, donepezil (a positive control meditation used to improve cognition) and A. indica at 250, 500, and 1000 mg/kg BW for 30 days. The novel object recognition test (NORT) was used to assess the cognitive function, and the open field test (OFT) was utilized to assess spontaneous locomotor activity. Their brains and blood were taken to measure levels of brain-derived neurotrophic factor (BDNF), blood cortisol levels, and the density of survival neuron.
Results: The discrimination index ratio of the stressed rats treated with either donepezil or A. indica flower extract at all doses was significantly improved as measured by NORT. Moreover, there was no significant difference between the control and stress groups in the locomotor behaviors of rearing and licking. The stressed rats treated with donepezil and A. indica flower extract had significant higher both BDNF levels and survival neuron density in the brain. However, their blood cortisol levels were lower than the stressed rats given vehicle.
Conclusions: A. indica flower extract helps improving cognitive function in the stressed rats by boosting BDNF and protecting against neuronal loss in the brain.

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