Parallel processing of quickly and slowly mobilized reserve vesicles in hippocampal synapses

Author:

Rodríguez Gotor Juan José1ORCID,Mahfooz Kashif2ORCID,Pérez-Otaño Isabel1ORCID,Wesseling John F.1ORCID

Affiliation:

1. Institute for Neurosciences CSIC-UMH

2. Dept. of Pharmacology, University of Oxford

Abstract

Vesicles within presynaptic terminals are thought to be segregated into a variety of readily releasable and reserve pools. The nature of the pools and tra ffi cking between them is not well understood, but pools that are slow to mobilize when synapses are active are often assumed to feed pools that are mobilized more quickly, in a series. However, electrophysiological studies of synaptic transmission have suggested instead a parallel organization where vesicles within slowly and quickly mobilized reserve pools would separately feed independent reluctant- and fast-releasing subdivisions of the readily releasable pool. Here we use FM-dyes to con fi rm the existence of multiple reserve pools at hippocampal synapses and a parallel organization that prevents intermixing between the pools, even when stimulation is intense enough to drive exocytosis at the maximum rate. The experiments additionally demonstrate extensive heterogeneity among synapses in the relative sizes of the slowly and quickly mobilized reserve pools, which suggests equivalent heterogeneity in the numbers of reluctant and fast-releasing readily releasable vesicles that may be relevant for understanding information processing and storage.

Publisher

eLife Sciences Publications, Ltd

Reference74 articles.

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