The density of AMPA receptors activated by a transmitter quantum at the climbing fibre - Purkinje cell synapse in immature rats

Momiyama A, Silver R, Häusser M, Notomi T, Wu Y, Shigemoto R, Cull Candy S. 2003. The density of AMPA receptors activated by a transmitter quantum at the climbing fibre - Purkinje cell synapse in immature rats. Journal of Physiology. 549(1), 75–92.

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Momiyama, Akiko; Silver, Rachel A; Häusser, Michael A; Notomi, Takuya; Wu, Yue; Shigemoto, RyuichiIST Austria ; Cull-Candy, Stuart G
Abstract
We aimed to estimate the number of AMPA receptors (AMPARs) bound by the quantal transmitter packet, their single-channel conductance and their density in the postsynaptic membrane at cerebellar Purkinje cell synapses. The synaptic and extrasynaptic AMPARs were examined in Purkinje cells in 2- to 4-day-old rats, when they receive synaptic inputs solely from climbing fibres (CFs). Evoked CF EPSCs and whole-cell AMPA currents displayed roughly linear current-voltage relationships, consistent with the presence of GluR2 subunits in synaptic and extrasynaptic AMPARs. The mean quantal size, estimated from the miniature EPSCs (MEPSCs), was ∼300 pS. Peak-scaled non-stationary fluctuation analysis of spontaneous EPSCs and MEPSCs gave a weighted-mean synaptic channel conductance of ∼5 pS (∼7 pS when corrected for filtering). By applying non-stationary fluctuation analysis to extrasynaptic currents activated by brief glutamate pulses (5 mM), we also obtained a small single-channel conductance estimate for extrasynaptic AMPARs (∼11 pS). This approach allowed us to obtain a maximum open probability (Po,max) value for the extrasynaptic receptors (Po,max = 0.72). Directly resolved extrasynaptic channel openings in the continued presence of glutamate exhibited clear multiple-conductance levels. The mean area of the postsynaptic density (PSD) of these synapses was 0.074 μm2, measured by reconstructing electron-microscopic (EM) serial sections. Postembedding immunogold labelling by anti-GluR2/3 antibody revealed that AMPARs are localised in PSDs. From these data and by simulating error factors, we estimate that at least 66 AMPARs are bound by a quantal transmitter packet at CF-Purkinje cell synapses, and the receptors are packed at a minimum density of ∼900 μm-2 in the postsynaptic membrane.
Publishing Year
Date Published
2003-05-15
Journal Title
Journal of Physiology
Volume
549
Issue
1
Page
75 - 92
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Momiyama A, Silver R, Häusser M, et al. The density of AMPA receptors activated by a transmitter quantum at the climbing fibre - Purkinje cell synapse in immature rats. Journal of Physiology. 2003;549(1):75-92. doi:10.1113/jphysiol.2002.033472
Momiyama, A., Silver, R., Häusser, M., Notomi, T., Wu, Y., Shigemoto, R., & Cull Candy, S. (2003). The density of AMPA receptors activated by a transmitter quantum at the climbing fibre - Purkinje cell synapse in immature rats. Journal of Physiology. Wiley-Blackwell. https://doi.org/10.1113/jphysiol.2002.033472
Momiyama, Akiko, Rachel Silver, Michael Häusser, Takuya Notomi, Yue Wu, Ryuichi Shigemoto, and Stuart Cull Candy. “The Density of AMPA Receptors Activated by a Transmitter Quantum at the Climbing Fibre - Purkinje Cell Synapse in Immature Rats.” Journal of Physiology. Wiley-Blackwell, 2003. https://doi.org/10.1113/jphysiol.2002.033472.
A. Momiyama et al., “The density of AMPA receptors activated by a transmitter quantum at the climbing fibre - Purkinje cell synapse in immature rats,” Journal of Physiology, vol. 549, no. 1. Wiley-Blackwell, pp. 75–92, 2003.
Momiyama A, Silver R, Häusser M, Notomi T, Wu Y, Shigemoto R, Cull Candy S. 2003. The density of AMPA receptors activated by a transmitter quantum at the climbing fibre - Purkinje cell synapse in immature rats. Journal of Physiology. 549(1), 75–92.
Momiyama, Akiko, et al. “The Density of AMPA Receptors Activated by a Transmitter Quantum at the Climbing Fibre - Purkinje Cell Synapse in Immature Rats.” Journal of Physiology, vol. 549, no. 1, Wiley-Blackwell, 2003, pp. 75–92, doi:10.1113/jphysiol.2002.033472.

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