Journal
NATURE NEUROSCIENCE
Volume 17, Issue 8, Pages 1073-1082Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nn.3754
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Funding
- US National Institutes of Health [NIMH 096816, NINDS 076708, DK042394, DK088227, HL052173]
- Intellectual Disability Research Center [P30HD024064]
- Dan L. Duncan Cancer Center [P30CA125123]
- Cancer Prevention and Research Institute of Texas (CPRIT) [RP100861]
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At hippocampal synapses, activation of group I metabotropic glutamate receptors (mGluRs) induces long-term depression (LTD), which requires new protein synthesis. However, the underlying mechanism remains elusive. Here we describe the translational program that underlies mGluR-LTD and identify the translation factor eIF2 alpha as its master effector. Genetically reducing eIF2 alpha phosphorylation, or specifically blocking the translation controlled by eIF2 alpha phosphorylation, prevented mGluR-LTD and the internalization of surface AMPA receptors (AMPARs). Conversely, direct phosphorylation of eIF2 alpha, bypassing mGluR activation, triggered a sustained LTD and removal of surface AMPARs. Combining polysome profiling and RNA sequencing, we identified the mRNAs translationally upregulated during mGluR-LTD. Translation of one of these mRNAs, oligophrenin-1, mediates the LTD induced by eIF2 alpha phosphorylation. Mice deficient in phospho-eIF2 alpha-mediated translation are impaired in object-place learning, a behavioral task that induces hippocampal mGluR-LTD in vivo. Our findings identify a new model of mGluR-LTD, which promises to be of value in the treatment of mGluR-LTD-linked cognitive disorders.
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