Intermediates in synaptic vesicle recycling revealed by optical imaging of Drosophila neuromuscular junctions

We show that uptake and release of the styryl dye FM-143 may be used to monitor synaptic vesicle exocytosis and recycling at Drosophila larval neuromuscular junctions. At Drosophila nerve terminals, FM1–43 specifically labels subsynaptic domains enriched in synaptotagmin, in a manner that requires C...

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Veröffentlicht in:Neuron (Cambridge, Mass.) Mass.), 1994-08, Vol.13 (2), p.363-375
Hauptverfasser: Ramaswami, Mani, Krishnan, K.S., Kelly, Regis B.
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container_title Neuron (Cambridge, Mass.)
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creator Ramaswami, Mani
Krishnan, K.S.
Kelly, Regis B.
description We show that uptake and release of the styryl dye FM-143 may be used to monitor synaptic vesicle exocytosis and recycling at Drosophila larval neuromuscular junctions. At Drosophila nerve terminals, FM1–43 specifically labels subsynaptic domains enriched in synaptotagmin, in a manner that requires Ca 2+, membrane depolarization, and shibire ( shi) function. Endocytosis rates, very low in unstimulated synapses, are induced severalfold by the exocytosis of synaptic vesicles. Using shi ts1 mutant synapses to separate synaptic vesicle fusion and recycling temporally, we show that recycling events subsequent to the shi block do not require extracellular Ca 2+. We suggest that two distinct intermediate stages in vesicle recycling may be trapped and analyzed at Drosophila neuromuscular junctions.
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subjects Animals
Calcium - physiology
Calcium-Binding Proteins
Drosophila
Drosophila melanogaster
Drosophila Proteins
Dynamins
Endocytosis
Exocytosis
GTP Phosphohydrolases - physiology
Membrane Fusion
Membrane Glycoproteins - metabolism
Membrane Potentials
Nerve Tissue Proteins - metabolism
Neuromuscular Junction - physiology
Neuromuscular Junction - ultrastructure
Potassium - physiology
Spider Venoms - pharmacology
Synaptic Transmission
Synaptic Vesicles - physiology
Synaptotagmins
title Intermediates in synaptic vesicle recycling revealed by optical imaging of Drosophila neuromuscular junctions
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