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Downregulation of Aquaporin 9 Exacerbates Beta-amyloid-induced Neurotoxicity in Alzheimer's Disease Models In vitro and In vivo.

Neuroscience. 2018 Dec 01;394:72-82. Epub 2018 Sep 26
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摘要


Alzheimer's disease (AD) is the most common cause of dementia in the elderly, characterized by progressive cognitive dysfunction. Aquaporin 9 (AQP9) is an aquaglyceroporin membrane channel shown biophysically to conduct water, glycerol, and other small solutes. In our study, we reported for the first time an age-associated decrease in AQP9 mRNA and protein expressions in both hippocampus and cerebral cortex of APPswe/PS1dE9 (Tg) AD mice at 3, 6 and 10 months of age. Consistently, we observed a dose-dependent downregulation of AQP9 expression in PC12 cells after treatment with amyloid-beta protein 1-40 (Aβ1-40). Pre-treatment with AQP9 small interfering RNA led to a more severe neurotoxicity in PC12 cells in response to Aβ1-40. Furthermore, we corroborated that the active participation of AQP9 in AD progression is associated with Aβ-induced apoptosis both in vitro and in vivo. Taken together, our results reveal an important role of AQP9 in Aβ-induced pathogenesis of AD which deserves further investigation.

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