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Cell Rep. 2016 Sep 6;16(10):2711-2722. doi: 10.1016/j.celrep.2016.08.009. Epub 2016 Aug 25.

Upregulation of μ3A Drives Homeostatic Plasticity by Rerouting AMPAR into the Recycling Endosomal Pathway.

Author information

1
Department of Biology and Center for Behavioral Genomics, Brandeis University, Waltham, MA 02454, USA.
2
Department of Brain and Cognitive Science, MIT, Cambridge, MA 02139, USA.
3
Department of Biology and Center for Behavioral Genomics, Brandeis University, Waltham, MA 02454, USA. Electronic address: nelson@brandeis.edu.
4
Department of Biology and Center for Behavioral Genomics, Brandeis University, Waltham, MA 02454, USA. Electronic address: turrigiano@brandeis.edu.

Abstract

Synaptic scaling is a form of homeostatic plasticity driven by transcription-dependent changes in AMPA-type glutamate receptor (AMPAR) trafficking. To uncover the pathways involved, we performed a cell-type-specific screen for transcripts persistently altered during scaling, which identified the μ subunit (μ3A) of the adaptor protein complex AP-3A. Synaptic scaling increased μ3A (but not other AP-3 subunits) in pyramidal neurons and redistributed dendritic μ3A and AMPAR to recycling endosomes (REs). Knockdown of μ3A prevented synaptic scaling and this redistribution, while overexpression (OE) of full-length μ3A or a truncated μ3A that cannot interact with the AP-3A complex was sufficient to drive AMPAR to REs. Finally, OE of μ3A acted synergistically with GRIP1 to recruit AMPAR to the dendritic membrane. These data suggest that excess μ3A acts independently of the AP-3A complex to reroute AMPAR to RE, generating a reservoir of receptors essential for the regulated recruitment to the synaptic membrane during scaling up.

PMID:
27568566
PMCID:
PMC5226429
DOI:
10.1016/j.celrep.2016.08.009
[Indexed for MEDLINE]
Free PMC Article

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