Inhibition of microRNA-155 Alleviates Cognitive Impairment in Alzheimer’s Disease and Involvement of Neuroinflammation

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Author(s): Dandan Liu, Dandan Zhao, Yingkai Zhao, Yan Wang, Yong Zhao*, Chengfei Wen.

Journal Name: Current Alzheimer Research

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Background: Neuroinflammation has important effects on cognitive functions in the pathophysiological process of Alzheimer’s disease (AD). In the current report, we determined the effects of microRNA-155 (miR-155) on the levels of IL-1β, IL-6 and TNF-α, and their respective receptors in the hippocampus using a rat model of AD.

Methods: Real time RT-PCR, ELISA and western blot analysis were used to examine the miR-155, PICs and PIC receptors. The Morris water maze and spatial working memory tests were used to assess cognitive functions.

Results: miR-155 was increased in the hippocampus of AD rats, accompanied with amplification of IL-1β, IL-6 and TNF-α. Intracerebroventricular infusion of miR-155 inhibitor, but not its scramble attenuated the increases of IL-1β, IL-6 and TNF-α and upregulation of their receptors. MiR-155 inhibitor also attenuated upregulation of apoptotic Caspase-3 in the hippocampus of AD rats. Notably, inhibition of miR-155 or PIC receptors largely recovered the impaired learning performance in AD rat.

Conclusion: We showed the critical role of miR-155 in regulating the memory impairment in AD rats likely via engagement of neuroinflammatory mechanisms, suggesting that miR-155 and its signaling molecules may present prospects in preventing and/or improving development of the impaired cognitive functions in AD.

Keywords: miroRNA-155, pro-inflammatory cytokines, Caspase-3, hippocampus, Alzheimer’s disease, neuroinflammation

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Article Details

(E-pub Ahead of Print)
DOI: 10.2174/1567205016666190503145207
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