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Synapse Clusters Are Preferentially Formed by Synapses with Large Recycling Pool Sizes

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  • Oliver Welzel
  • Carsten H Tischbirek
  • Jasmin Jung
  • Eva M Kohler
  • Alexei Svetlitchny
  • Andreas W Henkel
  • Johannes Kornhuber
  • Teja W Groemer

Abstract

Synapses are distributed heterogeneously in neural networks. The relationship between the spatial arrangement of synapses and an individual synapse's structural and functional features remains to be elucidated. Here, we examined the influence of the number of adjacent synapses on individual synaptic recycling pool sizes. When measuring the discharge of the styryl dye FM1–43 from electrically stimulated synapses in rat hippocampal tissue cultures, a strong positive correlation between the number of neighbouring synapses and recycling vesicle pool sizes was observed. Accordingly, vesicle-rich synapses were found to preferentially reside next to neighbours with large recycling pool sizes. Although these synapses with large recycling pool sizes were rare, they were densely arranged and thus exhibited a high amount of release per volume. To consolidate these findings, functional terminals were marked by live-cell antibody staining with anti-synaptotagmin-1-cypHer or overexpression of synaptopHluorin. Analysis of synapse distributions in these systems confirmed the results obtained with FM 1–43. Our findings support the idea that clustering of synapses with large recycling pool sizes is a distinct developmental feature of newly formed neural networks and may contribute to functional plasticity.

Suggested Citation

  • Oliver Welzel & Carsten H Tischbirek & Jasmin Jung & Eva M Kohler & Alexei Svetlitchny & Andreas W Henkel & Johannes Kornhuber & Teja W Groemer, 2010. "Synapse Clusters Are Preferentially Formed by Synapses with Large Recycling Pool Sizes," PLOS ONE, Public Library of Science, vol. 5(10), pages 1-9, October.
  • Handle: RePEc:plo:pone00:0013514
    DOI: 10.1371/journal.pone.0013514
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