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Article Dans Une Revue Journal of Cell Biology Année : 2023

Presynapses contain distinct actin nanostructures

Dominic Bingham
Channa Elise Jakobs
Florian Wernert
Fanny Boroni-Rueda
Nicolas Jullien
Eva-Maria Schentarra
Karoline Friedl
Julie da Costa Moura
Ghislaine Caillol
Yuki Ogawa

Résumé

The architecture of the actin cytoskeleton that concentrates at presynapses remains poorly known, hindering our understanding of its roles in synaptic physiology. In this work, we measure and visualize presynaptic actin by diffraction-limited and super-resolution microscopy, thanks to a validated model of bead-induced presynapses in cultured neurons. We identify a major population of actin-enriched presynapses that concentrates more presynaptic components and shows higher synaptic vesicle cycling than their non-enriched counterparts. Pharmacological perturbations point to an optimal actin amount and the presence of distinct actin structures within presynapses. We directly visualize these nanostructures using Single Molecule Localization Microscopy (SMLM), defining three distinct types: an actin mesh at the active zone, actin rails between the active zone and deeper reserve pools, and actin corrals around the whole presynaptic compartment. Finally, CRISPR-tagging of endogenous actin allows us to validate our results in natural synapses between cultured neurons, confirming the role of actin enrichment and the presence of three types of presynaptic actin nanostructures.
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Dates et versions

hal-04220784 , version 1 (28-09-2023)

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Dominic Bingham, Channa Elise Jakobs, Florian Wernert, Fanny Boroni-Rueda, Nicolas Jullien, et al.. Presynapses contain distinct actin nanostructures. Journal of Cell Biology, 2023, 222 (10), ⟨10.1083/jcb.202208110⟩. ⟨hal-04220784⟩
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