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Related Experiment Videos

A cell-free system for regulated exocytosis in PC12 cells.

J Avery1, D J Ellis, T Lang

  • 1Department of Neurobiology, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg, D-37077 Göttingen, Germany.

The Journal of Cell Biology
|January 29, 2000
PubMed
Summary

Researchers created a cell-free system to study regulated exocytosis in PC12 cells. This method allows high-resolution monitoring of single vesicle fusion events for biochemical analysis.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Regulated exocytosis is crucial for cellular communication.
  • Studying exocytosis in real-time at the single-vesicle level presents technical challenges.

Purpose of the Study:

  • To develop a cell-free system for investigating regulated exocytosis.
  • To enable high-resolution imaging and biochemical analysis of exocytotic events.

Main Methods:

  • Developed a cell-free system using PC12 cell plasma membrane patches with attached secretory vesicles.
  • Preloaded vesicles with acridine orange for fluorescence monitoring.
  • Utilized fluorescence dequenching, electron microscopy, and atomic force microscopy for analysis.

Main Results:

Related Experiment Videos

  • Demonstrated Ca(2+)-dependent exocytosis in the cell-free system, requiring micromolar Ca(2+) and cytosol.
  • Observed release of 42% of docked granules upon stimulation.
  • Confirmed vesicle presence and fusion events using microscopy techniques.

Conclusions:

  • The developed cell-free system allows for real-time, high-resolution monitoring of single vesicle exocytosis.
  • This system provides access to the exocytosis site for further biochemical and molecular investigations.
  • The system is sensitive to calcium and tetanus toxin, validating its biological relevance.