Naringenin-induced enhanced antioxidant defence system meliorates cholinergic neurotransmission and consolidates memory in male rats

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Abstract

Aims:

Free radical mediated neurotoxicity is a leading cause of neurodegenerative disorders. Neurodegeneration due to oxidative stress can produce cognitive dysfunctions. Flavonoids and curcuminoids are naturally occurring polyphenolic compounds that display a variety of therapeutic importance against oxidative stress.

Main methods:

This study was designed to assess potential role of polyphenolic compounds in neurocognitive functions and prevention against oxidative stress. For this purpose, young rats were orally treated with naringenin (NAR), curcumin (CUR) and quercetin (QUE) at a dose of 50 mg/kg, 200 mg/kg and 50 mg/kg respectively for 16 days. At 4th day of drug administration cognitive functions were monitored by Morris water maze (MWM) test. In MWM cognitive functions in terms of learning acquisition (1 h after training), retention (24 h after training), memory extinction (4 days after training), and reconsolidation (8 and 12 days after training) were monitored. Biochemical and neurochemical analysis were done in whole brain.

Key findings:

Treatment of NAR, CUR and QUE significantly enhanced learning acquisition, memory retention and reconsolidation and prevented memory extinction. Treatment of NAR and QUE prevented the alteration of brain antioxidant defence system by enhancing antioxidant enzyme activities and increasing antioxidant compound concentration. Oxidative stress in terms of lipid peroxidation was significantly prevented in treated rats. Serotonergic and cholinergic improvement was also found in treated rats.

Significance:

The present study therefore provides biological evidence supporting the usefulness of these polyphenolic compounds in daily life for improvement of cognitive abilities and hence may have a potential role in the management of dementia and related disorders.

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