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Constitutive endocytosis of GABA(A) receptors by an association with the adaptin AP2 complex modulates inhibitory synaptic currents in hippocampal neurons

Kittler, JT; Delmas, P; Jovanovic, JN; Brown, DA; Smart, TG; Moss, SJ; (2000) Constitutive endocytosis of GABA(A) receptors by an association with the adaptin AP2 complex modulates inhibitory synaptic currents in hippocampal neurons. J NEUROSCI , 20 (21) 7972 - 7977. Green open access

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Abstract

Type A GABA receptors (GABA(A)) mediate the majority of fast synaptic inhibition in the brain and are believed to be predominantly composed of alpha, beta, and gamma subunits. Although changes in cell surface GABA(A) receptor number have been postulated to be of importance in modulating inhibitory synaptic transmission, little is currently known on the mechanism used by neurons to modify surface receptor levels at inhibitory synapses. To address this issue, we have studied the cell surface expression and maintenance of GABA(A) receptors. Here we show that constitutive internalization of GABA(A) receptors in hippocampal neurons and recombinant receptors expressed in A293 cells is mediated by clathrin- dependent endocytosis. Furthermore, we identify an interaction between the GABA(A) receptor beta and gamma subunits with the adaptin complex AP2, which is critical for the recruitment of integral membrane proteins into clathrin-coated pits. GABA(A) receptors also colocalize with AP2 in cultured hippocampal neurons. Finally, blocking clathrin-dependant endocytosis with a peptide that disrupts the association between amphiphysin and dynamin causes a large sustained increase in the amplitude of miniature IPSCs in cultured hippocampal neurons. These results suggest that GABA(A) receptors cycle between the synaptic membrane and intracellular sites, and their association with AP2 followed by recruitment into clathrin- coated pits represents an important mechanism in the postsynaptic modulation of inhibitory synaptic transmission.

Type: Article
Title: Constitutive endocytosis of GABA(A) receptors by an association with the adaptin AP2 complex modulates inhibitory synaptic currents in hippocampal neurons
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.jneurosci.org/content/20/21/7972.full
Language: English
Additional information: This work is available to the public to copy, distribute, or display under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported license.
Keywords: GABA(A) receptor, endocytosis, clathrin, adaptin, mIPSC, AP2, dynamin, CLATHRIN-COATED VESICLES, DYNAMIN-DEPENDENT ENDOCYTOSIS, PROTEIN-KINASE-C, A RECEPTORS, MEDIATED ENDOCYTOSIS, SUBUNIT, ACTIVATION, TERMINALS, SYNAPSES, BRAIN
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Neuro, Physiology and Pharmacology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy > Pharmacology
URI: https://discovery.ucl.ac.uk/id/eprint/154893
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