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Inhibition of the Schizophrenia-Associated MicroRNA miR-137 Disrupts Nrg1? Neurodevelopmental Signal Transduction.


ABSTRACT: Genomic studies have repeatedly associated variants in the gene encoding the microRNA miR-137 with increased schizophrenia risk. Bioinformatic predictions suggest that miR-137 regulates schizophrenia-associated signaling pathways critical to neural development, but these predictions remain largely unvalidated. In the present study, we demonstrate that miR-137 regulates neuronal levels of p55?, PTEN, Akt2, GSK3?, mTOR, and rictor. All are key proteins within the PI3K-Akt-mTOR pathway and act downstream of neuregulin (Nrg)/ErbB and BDNF signaling. Inhibition of miR-137 ablates Nrg1?-induced increases in dendritic protein synthesis, phosphorylated S6, AMPA receptor subunits, and outgrowth. Inhibition of miR-137 also blocks mTORC1-dependent responses to BDNF, including increased mRNA translation and dendritic outgrowth, while leaving mTORC1-independent S6 phosphorylation intact. We conclude that miR-137 regulates neuronal responses to Nrg1? and BDNF through convergent mechanisms, which might contribute to schizophrenia risk by altering neural development.

SUBMITTER: Thomas KT 

PROVIDER: S-EPMC5745041 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Inhibition of the Schizophrenia-Associated MicroRNA miR-137 Disrupts Nrg1α Neurodevelopmental Signal Transduction.

Thomas Kristen Therese KT   Anderson Bart Russell BR   Shah Niraj N   Zimmer Stephanie Elaine SE   Hawkins Daniel D   Valdez Arielle Nicole AN   Gu Qiaochu Q   Bassell Gary Jonathan GJ  

Cell reports 20170701 1


Genomic studies have repeatedly associated variants in the gene encoding the microRNA miR-137 with increased schizophrenia risk. Bioinformatic predictions suggest that miR-137 regulates schizophrenia-associated signaling pathways critical to neural development, but these predictions remain largely unvalidated. In the present study, we demonstrate that miR-137 regulates neuronal levels of p55γ, PTEN, Akt2, GSK3β, mTOR, and rictor. All are key proteins within the PI3K-Akt-mTOR pathway and act down  ...[more]

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