Competitive processes shape multi-synapse plasticity along dendritic segments

Thomas E. Chater, Maximilian F. Eggl, Yukiko Goda () and Tatjana Tchumatchenko ()
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Thomas E. Chater: RIKEN Center for Brain Science
Maximilian F. Eggl: University of Bonn Medical Center
Yukiko Goda: RIKEN Center for Brain Science
Tatjana Tchumatchenko: University of Bonn Medical Center

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract Neurons receive thousands of inputs onto their dendritic arbour, where individual synapses undergo activity-dependent plasticity. Long-lasting changes in postsynaptic strengths correlate with changes in spine head volume. The magnitude and direction of such structural plasticity - potentiation (sLTP) and depression (sLTD) - depend upon the number and spatial distribution of stimulated synapses. However, how neurons allocate resources to implement synaptic strength changes across space and time amongst neighbouring synapses remains unclear. Here we combined experimental and modelling approaches to explore the elementary processes underlying multi-spine plasticity. We used glutamate uncaging to induce sLTP at varying number of synapses sharing the same dendritic branch, and we built a model incorporating a dual role Ca2+-dependent component that induces spine growth or shrinkage. Our results suggest that competition among spines for molecular resources is a key driver of multi-spine plasticity and that spatial distance between simultaneously stimulated spines impacts the resulting spine dynamics.

Date: 2024
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DOI: 10.1038/s41467-024-51919-0

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