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MiR-539-5p Decreases amyloid β-protein production, hyperphosphorylation of Tau and Memory Impairment by Regulating PI3K/Akt/GSK-3β Pathways in APP/PS1 Double Transgenic Mice

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Abstract

The production of amyloid β (Aβ) and tau hyperphosphorylation have been identified as key processes in Alzheimer’s disease (AD) pathogenesis. MiR-539-5p has been found to be abnormally expressed in brain tissue; however, the functional role of miR-539-5p in the pathogenesis of AD remains unclear. In our study, we found that the expression of miR-539-5p was significantly downregulated in humans and mice with AD and was negatively correlated with expression of APP, caveolin 1, and GSK-3β. Moreover, upregulation of miR-539-5p inhibited Aβ accumulation, tau phosphorylation, oxidative stress, and apoptosis and improved memory ability in AD mice. Furthermore, by using bioinformatics tool and dual-luciferase reporter assay, APP, Caveolin 1, and GSK-3β were confirmed as direct targets of miR-539-5p. In addition, the PI3K/AKT/GSK-3β signaling pathway can be regulated by miR-539-5p. In conclusion, this study provided a novel insight into the pathologic mechanism of AD by identifying that miR-539-5p plays a neuroprotective role in AD.

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All data generated or analyzed during this study are included in this published article.

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Funding

This work was supported by the Shenzhen Science & Technology Commission Grants (Grant No. JCYJ20180507184656626).

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YZ conceived and designed the experiments; YSJ analyzed and interpreted the results of the experiments; LS performed the experiments.

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Correspondence to Yuan Zhang.

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The authors declare that they have no conflicts of interest.

Ethical Approval

For animal studies, all experimental protocols employed in this study were approved by the Medical Ethics Committee of Shenzhen Second People’s Hospital. All protocols of human studies were reviewed and approved by the Medical Ethics Committee of Shenzhen Second People’s Hospital (Approval no. 20181106007). Before the actual data collection, verbal and written informed consent was obtained from the study participants.

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Jiang, Y., Zhang, Y. & Su, L. MiR-539-5p Decreases amyloid β-protein production, hyperphosphorylation of Tau and Memory Impairment by Regulating PI3K/Akt/GSK-3β Pathways in APP/PS1 Double Transgenic Mice. Neurotox Res 38, 524–535 (2020). https://doi.org/10.1007/s12640-020-00217-w

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  • DOI: https://doi.org/10.1007/s12640-020-00217-w

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