miR-132/212 deficiency impairs tau metabolism and promotes pathological aggregation in vivo.

Abstract:

:Alzheimer's disease (AD) and related tauopathies comprise a large group of neurodegenerative diseases associated with the pathological aggregation of tau protein. While much effort has focused on understanding the function of tau, little is known about the endogenous mechanisms regulating tau metabolism in vivo and how these contribute to disease. Previously, we have shown that the microRNA (miRNA) cluster miR-132/212 is downregulated in tauopathies such as AD. Here, we report that miR-132/212 deficiency in mice leads to increased tau expression, phosphorylation and aggregation. Using reporter assays and cell-based studies, we demonstrate that miR-132 directly targets tau mRNA to regulate its expression. We identified GSK-3β and PP2B as effectors of abnormal tau phosphorylation in vivo. Deletion of miR-132/212 induced tau aggregation in mice expressing endogenous or human mutant tau, an effect associated with autophagy dysfunction. Conversely, treatment of AD mice with miR-132 mimics restored in part memory function and tau metabolism. Finally, miR-132 and miR-212 levels correlated with insoluble tau and cognitive impairment in humans. These findings support a role for miR-132/212 in the regulation of tau pathology in mice and humans and provide new alternatives for therapeutic development.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Smith PY,Hernandez-Rapp J,Jolivette F,Lecours C,Bisht K,Goupil C,Dorval V,Parsi S,Morin F,Planel E,Bennett DA,Fernandez-Gomez FJ,Sergeant N,Buée L,Tremblay MÈ,Calon F,Hébert SS

doi

10.1093/hmg/ddv377

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

6721-35

issue

23

eissn

0964-6906

issn

1460-2083

pii

ddv377

journal_volume

24

pub_type

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