Endophilin drives the fast mode of vesicle retrieval in a ribbon synapse

Compensatory endocytosis of exocytosed membrane and recycling of synaptic vesicle components is essential for sustained synaptic transmission at nerve terminals. At the ribbon-type synapse of retinal bipolar cells, manipulations expected to inhibit the interactions of the clathrin adaptor protein co...

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Published in:The Journal of neuroscience 2011-06
Main Authors: Llobet Berenguer, Artur, 1972, Gallop, Jennifer L, Burden, Jemima, Çamdere, Gamze, Chandra, Priya, Vallis, Yvonne, Hopkins, Colin R, Lagnado, Leon, McMahon, Harvey T
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Language:English
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Cells
Cèl·lules
Enzims
Enzymes
Fisiologia
Metabolism
Metabolisme
Physiology
Sinapsi
Synapses
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container_title The Journal of neuroscience
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creator Llobet Berenguer, Artur, 1972
Gallop, Jennifer L
Burden, Jemima
Çamdere, Gamze
Chandra, Priya
Vallis, Yvonne
Hopkins, Colin R
Lagnado, Leon
McMahon, Harvey T
description Compensatory endocytosis of exocytosed membrane and recycling of synaptic vesicle components is essential for sustained synaptic transmission at nerve terminals. At the ribbon-type synapse of retinal bipolar cells, manipulations expected to inhibit the interactions of the clathrin adaptor protein complex (AP2) affect only the slow phase of endocytosis (τ = 10-15 s), leading to the conclusion that fast endocytosis (τ = 1-2 s) occurs by a mechanism that differs from the classical pathway of clathrin-coated vesicle retrieval from the plasma membrane. Here we investigate the role of endophilin in endocytosis at this ribbon synapse. Endophilin A1 is a synaptically enriched N-BAR domain-containing protein, suggested to function in clathrin-mediated endocytosis. Internal dialysis of the synaptic terminal with dominant-negative endophilin A1 lacking its linker and Src homology 3 (SH3) domain inhibited the fast mode of endocytosis, while slow endocytosis continued. Dialysis of a peptide that binds endophilin SH3 domain also decreased fast retrieval. Electron microscopy indicated that fast endocytosis occurred by retrieval of small vesicles in most instances. These results indicate that endophilin is involved in fast retrieval of synaptic vesicles occurring by a mechanism that can be distinguished from the classical pathway involving clathrin-AP2 interactions.
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subjects Cells
Cèl·lules
Enzims
Enzymes
Fisiologia
Metabolism
Metabolisme
Physiology
Sinapsi
Synapses
title Endophilin drives the fast mode of vesicle retrieval in a ribbon synapse
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