Journal
NATURE NEUROSCIENCE
Volume 15, Issue 7, Pages 988-997Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nn.3137
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Funding
- Hungarian Academy of Sciences
- Wellcome Trust [083484/Z/07/Z, 090197/Z/09/Z, 094513/Z/10/Z]
- European Research Council
- Hungarian National Office for Research and Technology-French National Research Agency TeT Fund (NKTH-Neurogen)
- GOP [1.1.1-08/1-2008-0085]
- Deutsche Forschungsgemeinschaft [SFB 780]
- Wellcome Trust [094513/Z/10/Z, 090197/Z/09/Z, 083484/Z/07/Z] Funding Source: Wellcome Trust
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Cortical synapses have structural, molecular and functional heterogeneity; our knowledge regarding the relationship between their ultrastructural and functional parameters is still fragmented. Here we asked how the neurotransmitter release probability and presynaptic [Ca2+] transients relate to the ultrastructure of rat hippocampal glutamatergic axon terminals. Two-photon Ca2+ imaging derived optical quantal analysis and correlated electron microscopic reconstructions revealed a tight correlation between the release probability and the active-zone area. Peak amplitude of [Ca2+] transients in single boutons also positively correlated with the active-zone area. Freeze-fracture immunogold labeling revealed that the voltage-gated calcium channel subunit Cav2.1 and the presynaptic protein Rim 1/2 are confined to the active zone and their numbers scale linearly with the active-zone area. Gold particles labeling Cav2.1 were nonrandomly distributed in the active zones. Our results demonstrate that the numbers of several active-zone proteins, including presynaptic calcium channels, as well as the number of docked vesicles and the release probability, scale linearly with the active-zone area.
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