Abstract
Understanding how the subcellular fate of newly synthesized AMPA receptors (AMPARs) is controlled is important for elucidating the mechanisms of neuronal function. We examined the effect of increased synthesis of AMPAR subunits on their subcellular distribution in rat hippocampal neurons. Virally expressed AMPAR subunits (GluR1 or GluR2) accumulated in cell bodies and replaced endogenous dendritic AMPAR with little effect on total dendritic amounts and caused no change in synaptic transmission. Coexpressing stargazin (STG) or mimicking GluR1 phosphorylation enhanced dendritic GluR1 levels by protecting GluR1 from lysosomal degradation. However, STG interaction or GluR1 phosphorylation did not increase surface or synaptic GluR1 levels. Unlike GluR1, STG did not protect GluR2 from lysosomal degradation or increase dendritic GluR2 levels. In general, AMPAR surface levels, and not intracellular amounts, correlated strongly with synaptic levels. Our results suggest that AMPAR surface expression, but not its intracellular production or accumulation, is critical for regulating synaptic transmission.
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Change history
09 July 2009
In the version of the Online Methods originally posted online, R1u in equation (1) should be R1, and R2u in equation (2) should be R2. In the text below equation (3), R1u should be R1. These errors have been corrected as of 9 July 2009.
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Acknowledgements
We thank N. Dawkins for expert technical assistance, J. Boehm for making viral constructs, R. Huganir for kindly providing STG cDNA and GluR1-deficient mice, and all of the members of the Malinow laboratory for useful discussions. This work was supported by grants from the Netherlands Organization for Scientific Research (H.W.K.), the Undergraduate Research Program of Cold Spring Harbor Laboratory (M.E.K.) and the US National Institutes of Health (R.M.).
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H.W.K. performed all of the experimental work. H.W.K. and R.M. designed the experiments and wrote the manuscript. C.D.K. wrote custom software for imaging analysis. M.E.K. designed the protocol for the immunohistochemistry experiments.
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Kessels, H., Kopec, C., Klein, M. et al. Roles of stargazin and phosphorylation in the control of AMPA receptor subcellular distribution. Nat Neurosci 12, 888–896 (2009). https://doi.org/10.1038/nn.2340
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DOI: https://doi.org/10.1038/nn.2340
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