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Pharmacological implications of ipriflavone against environmental metal–induced neurodegeneration and dementia in rats

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Abstract

Long-term exposure to environmental neurotoxic metals is implicated in the induction of dementia and cognitive decline. The present study aims to illustrate the therapeutic role of ipriflavone as a synthetic isoflavone against environmental metal–induced cognitive impairment in rats. Dementia was induced by a mixture of aluminum, cadmium, and fluoride for 90 days followed by ipriflavone for a further 30 days.  Metal-treated animals exhibited abnormal behaviors in the Morris water maze task. Neuropathological biomarkers including oxidative stress (TBARS, NO, SOD, GPX, GST, and GSH), inflammation (TNF- α, IL-6, and IL-1β), neurotransmission (AChE and MAO), and insulin resistance (insulin, insulin receptor, and insulin-degrading enzyme) were altered, which consequently elevated the level of amyloid-β42 and tau protein in the hippocampus tissues inducing neuronal injury. Ipriflavone significantly (P < 0.05) ameliorated the neurobehavioral abnormalities and the cognitive dysfunction biomarkers via antioxidant/anti-inflammatory mechanism. Moreover, ipriflavone downregulated the mRNA expression level of amyloid precursor protein and tau protein, preventing amyloid plaques and neurofibrillary tangle aggregation at P < 0.05. A molecular docking study revealed that ipriflavone has a potent binding affinity towards AChE more than donepezil and acts as a strong AChE inhibitor. Our data concluded that the therapeutic potential of ipriflavone against dementia could provide a new strategy in AD treatment.

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Hend Mohamed Hussien: participated in practical work, wrote the first manuscript, and approved the final manuscript. Doaa A. Ghareeb: conceptualized research idea design, shared in practical work, and revised the manuscript. Hany E. A. Ahmed: conducted molecular modelling and docking study. Hani S. Hafez: conducted statistical analysis. Samar R. Saleh: participated in the practical part and writing of the manuscript.

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Correspondence to Hend M. Hussien.

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The experiments were carried out according to the ethical guidelines of Institutional Animal Care & Use Committee, Pharmaceutical and Fermentation Industries Development Centre, City of Scientific Research and Technological Applications (SRTA-City), Borg Al-Arab, Alexandria, Egypt (IACUCCs)/IACUA#16-1P/7020), and followed the National Institutes of Health (NIH).

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Hussien, H.M., Ghareeb, D.A., Ahmed, H.E.A. et al. Pharmacological implications of ipriflavone against environmental metal–induced neurodegeneration and dementia in rats. Environ Sci Pollut Res 28, 65349–65362 (2021). https://doi.org/10.1007/s11356-021-15193-7

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