Differential Regulation of AMPA Receptor and GABA Receptor Trafficking by Tumor Necrosis Factor-α
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Open Access
- 23 March 2005
- journal article
- research article
- Published by Society for Neuroscience in Journal of Neuroscience
- Vol. 25 (12) , 3219-3228
- https://doi.org/10.1523/jneurosci.4486-04.2005
Abstract
The proinflammatory cytokine tumor necrosis factor-α (TNFα) causes a rapid exocytosis of AMPA receptors in hippocampal pyramidal cells and is constitutively required for the maintenance of normal surface expression of AMPA receptors. Here we demonstrate that TNFα acts on neuronal TNFR1 receptors to preferentially exocytose glutamate receptor 2-lacking AMPA receptors through a phosphatidylinositol 3 kinase-dependent process. This increases excitatory synaptic strength while changing the molecular stoichiometry of synaptic AMPA receptors. Conversely, TNFα causes an endocytosis of GABAAreceptors, resulting in fewer surface GABAAreceptors and a decrease in inhibitory synaptic strength. These results suggest that TNFα can regulate neuronal circuit homeostasis in a manner that may exacerbate excitotoxic damage resulting from neuronal insults.Keywords
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