Abstract
The present study was designed to evaluate the effect of Naringin on memory of unstressed and stressed Swiss young albino mice. Naringin (80 mg/kg, i.p.) and donepezil (10 mg/kg) were administered for 21 successive days to separate groups of unstressed and stressed mice. The nootropic activity was evaluated using elevated plus maze and Hebbs Williams Maze. Brain acetylcholinesterase (AChE), brain nitrite and plasma corticosterone levels were also estimated. unpredictable chronic mild stress was produced by using different stressors. Naringin (80 mg/kg) and donepezil significantly showed memory enhancing activity in both unstressed and stressed mice. Naringin significantly reduced brain AChE activity and brain nitrite levels in both unstressed and stressed mice. Naringin (80 mg/kg) significantly reversed scopolamine-induced amnesia in unstressed and stressed mice. 7-Nitroindazole [a neuronal nitric oxide synthase (NOS) inhibitor] and aminoguanidine (an inducible NOS inhibitor) significantly enhanced memory improving activity and brain nitrite decreasing effect of naringin in unstressed and stressed mice respectively. Plasma corticosterone levels were significantly decreased by naringin (80 mg/kg) in stressed mice as compared to its control. Thus, naringin showed memory enhancing activity in unstressed mice probably by decreasing brain AChE activity and by inhibition of neuronal NOS. The memory enhancing activity of naringin in stressed mice might be due to decrease in brain AChE activity, inhibition of inducible NOS and also by decreasing the elevated plasma corticosterone levels.
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Abbreviations
- AChE:
-
Acetylcholinesterase
- AG:
-
Aminoguanidine
- EPM:
-
Elevated plus maze
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- iNOS:
-
Inducible nitric oxide synthase
- nNOS:
-
Neuronal nitric oxide synthase
- 7-NI:
-
7-Nitroindazole
- TL:
-
Transfer latency
- TRC:
-
Time taken to reach reward chamber
- UCMS:
-
Unpredictable chronic mild stress
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Maratha, S.R., Mahadevan, N. Memory Enhancing Activity of Naringin in Unstressed and Stressed Mice: Possible Cholinergic and Nitriergic Modulation. Neurochem Res 37, 2206–2212 (2012). https://doi.org/10.1007/s11064-012-0844-8
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DOI: https://doi.org/10.1007/s11064-012-0844-8