Regulation of glutamate receptor internalization by the spine cytoskeleton is mediated by its PKA-dependent association with CPG2
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Loebrich-2013-Regulation of glutam.pdf
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Author(s)
Loebrich, Sven
Djukic, Biljana
Tong, Zachary J.
Cottrell, Jeffrey R.
Turrigiano, Gina G.
Nedivi, Elly
Date Issued
November 2013
Journal
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences (U.S.)
Citation
Loebrich, S., B. Djukic, Z. J. Tong, J. R. Cottrell, G. G. Turrigiano, and E. Nedivi. “Regulation of Glutamate Receptor Internalization by the Spine Cytoskeleton Is Mediated by Its PKA-Dependent Association with CPG2.” Proceedings of the National Academy of Sciences 110, no. 47 (November 4, 2013): E4548–E4556.
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Final published version
Abstract
A key neuronal mechanism for adjusting excitatory synaptic strength is clathrin-mediated endocytosis of postsynaptic glutamate receptors (GluRs). The actin cytoskeleton is critical for clathrin-mediated endocytosis, yet we lack a mechanistic understanding of its interaction with the endocytic process and how it may be regulated. Here we show that F-actin in dendritic spines physically binds the synaptic nuclear envelope 1 gene product candidate plasticity gene 2 (CPG2) in a PKA-dependent manner, and that this association is required for synaptic GluR internalization. Mutating two PKA sites on CPG2 disrupts its cytoskeletal association, attenuating GluR endocytosis and affecting the efficacy of synaptic transmission in vivo. These results identify CPG2 as an F-actin binding partner that functionally mediates interaction of the spine cytoskeleton with postsynaptic endocytosis. Further, the regulation of CPG2/F-actin association by PKA provides a gateway for cellular control of synaptic receptor internalization through second messenger signaling pathways. Recent identification of human synaptic nuclear envelope 1 as a risk locus for bipolar disorder suggests that CPG2 could play a role in synaptic dysfunction underlying neuropsychiatric disease.
MIT Department
Massachusetts Institute of Technology. Department of Biology
Massachusetts Institute of Technology. Department of Brain and Cognitive Sciences
Picower Institute for Learning and Memory
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DOI of Published Version
https://doi.org/10.1073/pnas.1318860110
