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Measuring Synaptic Vesicle Endocytosis in Cultured Hippocampal Neurons
07:30

Measuring Synaptic Vesicle Endocytosis in Cultured Hippocampal Neurons

Published on: September 4, 2017

Dap160/intersectin scaffolds the periactive zone to achieve high-fidelity endocytosis and normal synaptic growth

Bruno Marie1, Sean T Sweeney, Kira E Poskanzer

  • 1Department of Biochemistry and Biophysics, 1550 4th Street, GDBS Fourth Floor North, University of California, San Francisco, 94143, USA.

Neuron
|July 21, 2004
PubMed

Insights

Dap160 adaptor protein is crucial for synaptic vesicle recycling at the Drosophila neuromuscular junction (NMJ). Loss of Dap160 impairs endocytosis and causes synapse malformation, affecting neurotransmission.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Dap160/Intersectin is a multidomain adaptor protein.
  • It colocalizes with endocytic machinery in the periactive zone at the Drosophila NMJ.

Purpose of the Study:

  • To investigate the role of Dap160 in synaptic structure and function.
  • To generate and analyze severe loss-of-function mutations in Dap160 at the Drosophila NMJ.

Main Methods:

  • Generation of severe loss-of-function mutations for Dap160.
  • Analysis of endocytic protein levels in mutant synapses.
  • Functional assays including FM4-64 loading and transmitter release.
  • Morphological analysis of synaptic boutons.

Main Results:

  • Dap160 mutant synapses show decreased levels of key endocytic proteins (dynamin, endophilin, synaptojanin, AP180).
  • Synapses exhibit impaired synaptic vesicle recycling, reduced high-frequency transmitter release, and increased quantal size.
  • Mutant synapses are malformed with abundant, highly ramified small boutons.

Conclusions:

  • Dap160 is essential for maintaining synaptic structure and function.
  • Dap160 acts as a scaffold, coordinating endocytic machinery and signaling systems.
  • This coordination is critical for structural and functional synapse development at the Drosophila NMJ.

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