Ultrastructural Correlates of Presynaptic Functional Heterogeneity in Hippocampal Synapses
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AbstractAlthough similar in molecular composition, synapses can exhibit strikingly distinct functional transmitter release and plasticity characteristics. To determine whether ultrastructural differences co-define this functional heterogeneity, we combine hippocampal organotypic slice cultures, high-pressure freezing, freeze substitution, and 3D-electron tomography to compare two functionally distinct synapses: hippocampal Schaffer collateral and mossy fiber synapses. We find that mossy fiber synapses, which exhibit a lower release probability and stronger short-term facilitation than Schaffer collateral synapses, harbor lower numbers of docked synaptic vesicles at active zones and a second pool of possibly tethered vesicles in their vicinity. Our data indicate that differences in the ratio of docked versus tethered vesicles at active zones contribute to distinct functional characteristics of synapses. Copyright 2020 The Author(s)
SponsorsThis work was supported by grants from the Deutsche Forschungsgemeinschaft (SFB1286/A01 to B.H.C. and EXC 2067/1- 390729940 under Germany's Excellence Strategy to N.B.) and the European Commission (ERC Advanced Grant SynPrime, to N.B.).
hippocampal mossy fiber synapse
Identifier to cite or link to this itemhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85081644221&doi=10.1016%2fj.celrep.2020.02.083&partnerID=40&md5=97a3f2febecf31352b615fd632abc07a; http://hdl.handle.net/10713/12371