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Capturing and quantifying the exocytotic event.

J F Morris1, D V Pow

  • 1Department of Anatomy, University of Oxford, England.

The Journal of Experimental Biology
|September 1, 1988
PubMed
Summary
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Tannic acid enables visualization of exocytosis, revealing that protein release occurs across cell membranes, not just specialized sites. This challenges previous assumptions about neuronal secretion mechanisms.

Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Exocytosis is the universal mechanism for protein release in eukaryotic cells, but its precise mechanism remains poorly understood.
  • Visualizing exocytosis is challenging due to the transient nature of these events, especially in the mammalian nervous system.

Purpose of the Study:

  • To investigate the mechanism of exocytosis using tannic acid as an electron-microscopic visualization agent.
  • To determine the specific sites and regulation of exocytosis in the mammalian nervous system.

Main Methods:

  • Application of tannic acid to capture and visualize exocytosed granule cores electron-microscopically.
  • Quantification of exocytotic events in stimulated and unstimulated magnocellular neurosecretory systems and hypothalamic central nervous tissue.

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Main Results:

  • Exocytosis occurs uniformly across the membrane of perivascular nerve endings and axonal swellings, challenging the notion of specialized release sites.
  • Nerve endings exhibit higher exocytosis rates due to a high surface membrane-to-volume ratio, not specific membrane properties.
  • In the hypothalamus, dense-cored synaptic vesicle exocytosis occurs preferentially, but not exclusively, at the synaptic cleft, with significant release also occurring elsewhere on the bouton membrane.

Conclusions:

  • Exocytosis of magnocellular granules can occur at any membrane site, influenced by the cytoskeleton and local calcium levels, rather than restricted to specialized loci.
  • Neuronal release of transmitters and modulators may occur at sites other than those traditionally assumed, questioning long-held hypotheses.
  • Tannic acid is a valuable tool for studying exocytosis mechanisms and cellular adaptations of this process.