Abstract
Abnormal excessive production and deposition of β-amyloid (Aβ) peptides in selectively susceptible brain regions are thought to be a key pathogenic mechanism underlying Alzheimer’s disease (AD), resulting in memory deficits and cognitive impairment. Genistein is a phytoestrogen with great promise for counteracting diverse Aβ-induced insults, including oxidative stress and mitochondrial dysfunction. However, the exact molecular mechanism or mechanisms underlying the neuroprotective effects of genistein against Aβ-induced insults are largely uncharacterized. To further elucidate the possible mechanism(s) underlying these protective effects, we investigated the neuroprotective effects of genistein against Aβ-induced oxidative stress mediated by orchestrating α7 nicotinic acetylcholine receptor (α7nAChR) signaling in rat primary hippocampal neurons. Genistein significantly increased cell viability, reduced the number of apoptotic cells, decreased accumulation of reactive oxygen species (ROS), decreased contents of malondialdehyde (MDA) and lactate dehydrogenase (LDH), upregulated BCL-2 expression, and suppressed Caspase-3 activity occurring after treatment with 25 μM Aβ25-35. Simultaneously, genistein markedly inhibited the decreases in α7nAChR mRNA and protein expression in cells treated with Aβ25-35. In addition, α7nAChR signaling was intimately involved in the genistein-mediated activation of phosphatidylinositol 3-kinase (PI3K)/Akt and Nrf2/keap1 signaling. Thus, α7nAChR activity together with the PI3K/Akt/Nrf2 signaling cascade likely orchestrates the molecular mechanism underlying the neuroprotective effects of genistein against Aβ-induced oxidative injury.
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Acknowledgements
The authors would like to acknowledge Jiaofei Zhang and Minghui Niu for excellent technical assistance. We would like to thank Dr. Sebastian Schmull for critical reading the manuscript and the English language review.
Funding
This work was funded by the National Natural Science Foundation of China (grants 81571208, 81772357, and 82071551), a key grant from the National Nature Science Foundation of China (81830077), Natural Science Foundation of Shaanxi Province (2020JM-686), and Xi’an Science and Technology Research Project (2019114913YX004SF037(3)).
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J.G. (Jianbin Guo), G.Y. (Guoqing Yang), and Y.H. (Yuqing He) involved in conceptualization; G.C. (Guihua Cao); Funding acquisition, D.H.(Dingjun Hao); Investigation, J.A. (Jing An), and R.Z. (Rui Zhang) participated in data curation,; M.X. (Huiming Xu) and H.F. (Hong Fan) contributed to methodology, ; L.Z. (Lingling Zhang) involved in collecting resources; and H.Y. (Hao Yang) did supervision.
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All applicable international, national, and institutional guidelines for the care and use of animals were followed. All experimental procedures in studies involving animals were performed in accordance with the ethical standards of the Animal Ethics Committee of Honghui Hospital of Xi’an Jiaotong University (No. 201712004).
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Guo, J., Yang, G., He, Y. et al. Involvement of α7nAChR in the Protective Effects of Genistein Against β-Amyloid-Induced Oxidative Stress in Neurons via a PI3K/Akt/Nrf2 Pathway-Related Mechanism. Cell Mol Neurobiol 41, 377–393 (2021). https://doi.org/10.1007/s10571-020-01009-8
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DOI: https://doi.org/10.1007/s10571-020-01009-8