Rapid astrocyte-dependent facilitation amplifies multi-vesicular release in hippocampal synapses.

ABSTRACT: Synaptic facilitation is a major form of short-term plasticity typically driven by an increase in residual presynaptic calcium. Using near-total internal reflection fluorescence (near-TIRF) imaging of single vesicle release in cultured hippocampal synapses, we demonstrate a distinctive, release-dependent form of facilitation in which probability of vesicle release is higher following a successful glutamate release event than following a failure. This phenomenon has an onset of ≤500 ms and lasts several seconds, resulting in clusters of successful release events. The release-dependent facilitation requires neuronal contact with astrocytes and astrocytic glutamate uptake by EAAT1. It is not observed in neurons grown alone or in the presence of astrocyte-conditioned media. This form of facili

SUBMITTER: Myeong J 

PROVIDER: S-EPMC9805313 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature