Na, K-ATPase activity regulates AMPA receptor turnover through proteasome-mediated proteolysis

Dawei Zhang, Qingming Hou, Min Wang, Amy Lin, Larissa Jarzylo, Allison Navis, Aram Raissi, Fang Liu, Heng Ye Man

Research output: Contribution to journalArticlepeer-review

99 Scopus citations

Abstract

Neuronal activity largely depends on two key components on the membrane: The Na, K-ATPase (NKA) that maintains the ion gradients and sets the foundation of excitability, and the ionotropic glutamatergic AMPA receptors (AMPARs) through which sodium influx forms the driving force for excitation. Because the frequent sodium transients from glutamate receptor activity need to be efficiently extruded, a functional coupling between NKA and AMPARs should be a necessary cellular device for synapse physiology. We show that NKA is enriched at synapses and associates with AMPARs. NKA dysfunction induces a rapid reduction in AMPAR cell-surface expression as well as total protein abundance, leading to a long-lasting depression in synaptic transmission. AMPAR proteolysis requires sodium influx, proteasomal activity and receptor internalization. These data elucidate a novel mechanism by which NKA regulates AMPAR turnover and thereby synaptic strength and brain function.

Original languageEnglish
Pages (from-to)4498-4511
Number of pages14
JournalJournal of Neuroscience
Volume29
Issue number14
DOIs
StatePublished - 8 Apr 2009
Externally publishedYes

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