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Quercetin Exhibits α7nAChR/Nrf2/HO-1-Mediated Neuroprotection Against STZ-Induced Mitochondrial Toxicity and Cognitive Impairments in Experimental Rodents

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Abstract

The objective of the present study was to investigate the α7nAChR-mediated Nrf2-dependant protective activity against streptozotocin (STZ)-induced brain mitochondrial toxicity in Alzheimer’s disease (AD)-like rats. STZ (3 mg/kg) was injected through an intracerebroventricular route to induce AD-like dementia. Repeated Quercetin (50 mg/kg, i.p.) administration attenuated cognitive impairments in the STZ-challenged animals during Morris water-maze and Y-maze tests. Quercetin significantly mitigated the STZ-induced increase in cholinergic dysfunction, such as the increase in acetylcholinesterase activity, decrease in acetylcholine level, and activity of choline acetyltransferase, and increase in amyloid-beta aggregation and mitochondrial toxicity in respect of mitochondrial bioenergetics, integrity, and oxidative stress in memory-challenged rat hippocampus, prefrontal cortex and, amygdala. Further, Quercetin significantly attenuated STZ-induced reduction in the α7nAChRs and HO-1 expression levels in the selected rat brain regions. On the contrary, trigonelline (10 mg/kg, i.p.) and methyllycaconitine (2 mg/kg; i.p.) abolished the neuroprotective effects of Quercetin against STZ-induced behavioral, molecular, and biochemical alterations in the AD-like animals. Hence, Quercetin exhibits α7nAChR/Nrf2/HO-1-mediated neuroprotection against STZ-challenged AD-like animals. Thus, Quercetin could be considered as a potential therapeutic option in the management of AD.

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Abbreviations

STZ:

Streptozotocin

ICV:

Intracerebroventricular

AcCoA:

Acetyl coenzyme A

ChAT:

Choline acetyltransferase

AChE:

Acetylcholinesterase

α7nAChR:

Alpha7 nicotinic acetylcholine receptor

APP:

Amyloid-beta precursor protein

Aβ:

Amyloid beta

MLA:

Methyllycaconitine

Nrf2:

Nuclear factor erythroid 2-related factor 2

ROS:

Reactive oxygen species

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Acknowledgements

NKS is thankful to GLA University, Mathura, UP, India for the financial assistantship.

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Correspondence to Debapriya Garabadu.

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Singh, N.K., Garabadu, D. Quercetin Exhibits α7nAChR/Nrf2/HO-1-Mediated Neuroprotection Against STZ-Induced Mitochondrial Toxicity and Cognitive Impairments in Experimental Rodents. Neurotox Res 39, 1859–1879 (2021). https://doi.org/10.1007/s12640-021-00410-5

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  • DOI: https://doi.org/10.1007/s12640-021-00410-5

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