Presynapses contain distinct actin nanostructures.
Journal
The Journal of cell biology
ISSN: 1540-8140
Titre abrégé: J Cell Biol
Pays: United States
ID NLM: 0375356
Informations de publication
Date de publication:
02 10 2023
02 10 2023
Historique:
received:
19
08
2022
revised:
07
06
2023
accepted:
25
07
2023
pmc-release:
14
02
2024
medline:
15
8
2023
pubmed:
14
8
2023
entrez:
14
8
2023
Statut:
ppublish
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.
Identifiants
pubmed: 37578754
pii: 276185
doi: 10.1083/jcb.202208110
pmc: PMC10424573
pii:
doi:
Substances chimiques
Actins
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© 2023 Bingham et al.
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