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ARTICLE, Cellular/Molecular

Activity-Dependent Change in AMPA Receptor Properties in Cerebellar Stellate Cells

Siqiong June Liu and Stuart G. Cull-Candy
Journal of Neuroscience 15 May 2002, 22 (10) 3881-3889; DOI: https://doi.org/10.1523/JNEUROSCI.22-10-03881.2002
Siqiong June Liu
1Department of Pharmacology, University College London, London WC1E 6BT, United Kingdom
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Stuart G. Cull-Candy
1Department of Pharmacology, University College London, London WC1E 6BT, United Kingdom
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Abstract

High-frequency synaptic stimulation is thought to cause a rapid and lasting change in the expression of GluR2 subunit-containing AMPA receptors (AMPARs) at synapses in cerebellar stellate cells. We examined whether spontaneous synaptic activity affects the expression of GluR2-containing synaptic AMPARs and whether the change in AMPAR subtypes alters their Ca2+permeability and kinetic properties. We used intracellular spermine, which blocks GluR2-lacking receptors at depolarized potentials, to distinguish the presence of GluR2. In most cells, the spontaneous EPSC frequency was low, and evoked EPSCs displayed inwardly rectifyingI–V relationships, indicative of the presence of GluR2-lacking AMPARs. However, in cells that displayed a higher rate of spontaneous synaptic activity, EPSCs gave linearI–V plots, suggesting the presence of GluR2-containingAMPARs. This is consistent with the idea that spontaneous synaptic activity increased the expression of GluR2-containing AMPARs at synapses. The Ca2+permeability of AMPARs that gave inwardly rectifying currents in outside-out patches from TTX-treated cells was six times higher than in control cells that gave linear or outwardly rectifyingI–V plots. However, increased spontaneous synaptic activity did not significantly alter the EPSC decay time. Furthermore, the decay time course ofEPSCs mediated by GluR2-containing receptors was not different from that mediated by a mixed population of receptors at the same synapse. Our results suggest that the level of spontaneous synaptic activity can determine the subunit composition of postsynaptic receptors at this synapse. The activity-induced expression of GluR2-containing receptors significantly reduced the Ca2+ permeability of AMPARs in stellate cells but did not slow the decay time course of synaptic currents.

  • AMPA
  • stellate cell
  • cerebellum
  • AMPA channels
  • AMPA receptor subtypes
  • glutamate receptors
  • subunits
  • calcium permeability
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The Journal of Neuroscience: 22 (10)
Journal of Neuroscience
Vol. 22, Issue 10
15 May 2002
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Activity-Dependent Change in AMPA Receptor Properties in Cerebellar Stellate Cells
Siqiong June Liu, Stuart G. Cull-Candy
Journal of Neuroscience 15 May 2002, 22 (10) 3881-3889; DOI: 10.1523/JNEUROSCI.22-10-03881.2002

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Activity-Dependent Change in AMPA Receptor Properties in Cerebellar Stellate Cells
Siqiong June Liu, Stuart G. Cull-Candy
Journal of Neuroscience 15 May 2002, 22 (10) 3881-3889; DOI: 10.1523/JNEUROSCI.22-10-03881.2002
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Keywords

  • AMPA
  • stellate cell
  • cerebellum
  • AMPA channels
  • AMPA receptor subtypes
  • glutamate receptors
  • subunits
  • calcium permeability

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