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Related Experiment Videos

Visualization of gap junction mobility in living cells.

R Windoffer1, B Beile, A Leibold

  • 1Department of Anatomy, Johannes Gutenberg University Mainz, Germany.

Cell and Tissue Research
|April 20, 2000
PubMed
Summary

Gap junctions in living cells are highly dynamic, with plaques fusing and segregating. Their rapid turnover involves microvesicles, not primarily endocytosis or lysosomal degradation.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Gap junctions mediate direct cell-to-cell communication.
  • Understanding gap junction dynamics is crucial for cellular function and disease.

Purpose of the Study:

  • To investigate the dynamic behavior and turnover mechanisms of gap junctions in living cells.

Main Methods:

  • Expression of a connexin32-EGFP chimera (Cx.EGFP-1) in PLC cells.
  • Time-lapse fluorescence microscopy to observe gap junction dynamics.
  • Analysis of Cx.EGFP-1 localization with endocytosis markers.

Main Results:

  • Gap junction plaques exhibited high motility, fusion, and segregation.
  • Cytoplasmic Cx.EGFP-1 fluorescence showed limited co-localization with endocytosis markers and lysosomes.

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  • A short half-life (3.3 h) for Cx.EGFP-1 indicated rapid turnover.
  • Inhibition of protein synthesis increased endocytosis and reduced plaque size.

    • Conclusions:

    • Gap junction turnover is rapid and primarily mediated by mechanisms other than classical endocytosis and lysosomal degradation.
    • Cytoplasmic microvesicles likely play a significant role in gap junction assembly and disassembly.