Modulation of MGluR-dependent MAP1B Translation and AMPA Receptor Endocytosis by MicroRNA MiR-146a-5p

Overview

Journal J Neurosci

Specialty Neurology

Date 2013 May 24

PMID 23699512

Citations 32

Authors

Ying-Lin Chen

Che-Kun James Shen

Affiliations

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Abstract

The translation of dendritic microtubule-associated protein 1B (MAP1B) is exaggerated upon group I mGluR activation leading to AMPA receptor (AMPAR) endocytosis and consequent long-term depression. However, the mechanisms of regulation of MAP1B protein synthesis in the mature dendrites remain unclear. Here we have identified miR-146a-5p that targets the 3' UTR of MAP1B mRNA and represses its translation. Inhibition of the endogenous miR-146a-5p in mouse cultured hippocampal neurons triggers an increase of the dendritic MAP1B protein as well as the internalization of AMPARs, resulting in a decline in synaptic transmission. Conversely, enforced expression of miR-146a-5p inhibits MAP1B translation and attenuates group I mGluR-induced AMPAR endocytosis. Moreover, siRNA-mediated knockdown of MAP1B recovers the impairment of synaptic transmission caused by inhibition of miR-146a-5p. These results reveal that miR-146a-5p modulates the synaptic plasticity via repression of MAP1B protein synthesis.

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