Preprint

DZNE-2023-00264

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Light induced synaptic vesicle autophagy

Hoffmann, S. (First author)DZNE* ; Orlando, M. ; Andrzejak, E.DZNE* ; Trimbuch, T. ; Rosenmund, C. ; Ackermann, F.DZNE* ; Garner, C. C. (Last author)DZNE*

2018

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Please use a persistent id in citations: doi:10.1101/440719

Abstract: The regulated turnover of synaptic vesicle (SV) proteins is thought to involve the ubiquitin dependent tagging and degradation through endo-lysosomal and autophagy pathways. Yet, it remains unclear which of these pathways are used, when they become activated and whether SVs are cleared en-mass together with SV proteins or whether both are degraded selectively. Equally puzzling is how quickly these systems can be activated and whether they function in real time to support synaptic health. To address these questions, we have developed an imaging based system that simultaneously tags presynaptic proteins while monitoring autophagy. Moreover, by tagging SV proteins with a light activated reactive oxygen species (ROS) generator, Supernova, it was possible to temporally control the damage to specific SV proteins and assess their consequence to autophagy mediated clearance mechanisms and synaptic function. Our results show that, in mouse hippocampal neurons, presynaptic autophagy can be induced in as little as 5-10 minutes and eliminates primarily the damaged protein rather than the SV en-mass. Importantly, we also find that autophagy is essential for synaptic function, as light-induced damage to e.g. Synaptophysin only compromises synaptic function when autophagy is simultaneously blocked. These data support the concept that presynaptic boutons have a robust highly regulated clearance system to maintain not only synapse integrity, but also synaptic function.

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Contributing Institute(s):

1. Synaptopathy (AG Garner)
2. Astrocyte - Synapse Interaction (AG Ackermann)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Appears in the scientific report 2018

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Hoffmann, S. (First author)DZNE* ; Orlando, M. ; Andrzejak, E.DZNE* ; Bruns, C.DZNE* ; Trimbuch, T. ; Rosenmund, C. ; Garner, C. C.DZNE* ; Ackermann, F. (Last author)DZNE*
Light-Activated ROS Production Induces Synaptic Autophagy.
The journal of neuroscience 39(12), 2163-2183 (2019) [10.1523/JNEUROSCI.1317-18.2019]2019   Fulltext by Pubmed Central BibTeX | EndNote: XML, Text | RIS

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