Local Translation in Perisynaptic Astrocytic Processes Is Specific and Changes after Fear Conditioning
Résumé
Local translation is a conserved mechanism conferring cells the ability to quickly respond to local stimuli. In
the brain, it has been recently reported in astrocytes, whose fine processes contact blood vessels and synapses.
Yet the specificity and regulation of astrocyte local translation remain unknown. We study hippocampal
perisynaptic astrocytic processes (PAPs) and show that they contain the machinery for translation. Using
a refined immunoprecipitation technique, we characterize the entire pool of ribosome-bound mRNAs in PAPs
and compare it with the one expressed in the whole astrocyte. We find that a specific pool of mRNAs is highly
polarized at the synaptic interface. These transcripts encode an unexpected molecular repertoire, composed
of proteins involved in iron homeostasis, translation, cell cycle, and cytoskeleton. Remarkably, we observe
alterations in global RNA distribution and ribosome-bound status of some PAP-enriched transcripts after
fear conditioning, indicating the role of astrocytic local translation in memory and learning.
Domaines
Neurobiologie| Origine | Fichiers produits par l'(les) auteur(s) |
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