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Ultrastructural Correlates of Presynaptic Functional Heterogeneity in Hippocampal Synapses

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Lydia Maus
  • ChoongKu Lee
  • Bekir Altas
  • Sinem M Sertel
  • Kirsten Weyand
  • Silvio O Rizzoli
  • JeongSeop Rhee
  • Nils Brose
  • Imig, Cordelia
  • Benjamin H Cooper

Although 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.

OriginalsprogEngelsk
TidsskriftCell Reports
Vol/bind30
Udgave nummer11
Sider (fra-til)3632-3643.e8
ISSN2211-1247
DOI
StatusUdgivet - 17 mar. 2020
Eksternt udgivetJa

ID: 237850309