Abstract
Alzheimer's disease (AD) is a progressive, chronic and age-related neurodegenerative disorder that affects millions of people across the world. In pursuit of new anti-AD remedies, 2-[Hydroxy-(4-nitrophenyl)methyl]-cyclopentanone (NMC), a β hydroxyl ketone derivative was studied to explore its neuroprotective potentials against AD. The in-vitro AChE and BuChE enzymes inhibition were evaluated by Ellman protocol and antioxidant potentials of NMC by DPPH free radical scavenging assay. In-vivo behavioral studies were performed in the transgenic 5xFAD mice model of AD using shallow water maze (SWM), Paddling Y-Maze (PYM), elevated plus maze (EPM) and balance beam (BB) tests. Also, the ex-vivo cholinesterase inhibitory effects of NMC and histopathological analysis of amyloid-β plaques were determined in the frontal cortex and hippocampal regions of the mice brain. NMC exhibited significant in vitro anti-cholinesterase enzyme potentials with an IC50 value of 67 μg/ml against AChE and 96 μg/ml against BuChE respectively. Interestingly, the activities of AChE and BuChE enzymes were also significantly lower in the cortex and hippocampus of NMC-treated groups. Also, in the DPPH assessment, NMC displayed substantial antioxidant properties with an IC50 value observed as 171 μg/ml. Moreover, histopathological analysis via thioflavin-s staining displayed significantly lower plaques depositions in the cortex and hippocampus region of NMC-treated mice groups. Furthermore, SWM, PYM, EPM, and BB behavioral analysis indicated that NMC enhanced spatial learning, memory consolidation and improved balance performance. Altogether, to the best of our knowledge, we believe that NMC may serve as a potential and promising anti-cholinesterase, antioxidant and neuroprotective agent against AD.
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Abbreviations
- AD:
-
Alzheimer disease
- NMC:
-
2-[Hydroxy-(4-nitrophenyl)methyl]-cyclopentanone
- SWM:
-
Shallow water maze
- PYM:
-
Paddling Y-maze
- AChE:
-
Acetylcholinesterase enzyme
- BuChE:
-
Butrylcholinesterase enzyme
- CNS:
-
Central nervous system
- DTNB:
-
2,2 Dithiobisnitrobenzoic acid
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Funding
We acknowledge the funding (National research program for universities; NRPU 6671/KP/NRPU/R&D/HEC/2016) from Higher education commission of Pakistan for the completion of necessary part of the project. The funding authorities did not contribute to the plan, design or any other part of the research work.
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SIA performed and carried out all experimental work, data collection and evaluation, and wrote a preliminary draft of the manuscript. GA conceived, designed and supervised the study. Also, he edited and reviewed the final version of the manuscript. RU helped in performing genotyping studies. TM helped in data analysis and drafted the final version of the manuscript. NU synthesized and structurally confirmed the NMC compound (chemistry data published ‘Picolylamine as an Organocatalyst Template for highly Diastero-And Enantioselective Aqueous Aldol Reactions’. ANH helped us in the behavioral studies and edited and reviewed the final draft of the manuscript. All authors reviewed and approved the final version of the manuscript.
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This research was carried out under the project title as Novel targeted heterocyclic compounds, a potential candidate for Alzheimer's disease’ approved by the Research Ethical Committee of Pharmacy Department, University of Peshawar, Pakistan has been approved all experimental procedures on animals vide reference number 25/EC-18/Pharm, dated. 16/10/2018.
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Ahmad, S.I., Ali, G., Muhammad, T. et al. Synthetic β-hydroxy ketone derivative inhibits cholinesterases, rescues oxidative stress and ameliorates cognitive deficits in 5XFAD mice model of AD. Mol Biol Rep 47, 9553–9566 (2020). https://doi.org/10.1007/s11033-020-05997-0
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DOI: https://doi.org/10.1007/s11033-020-05997-0