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Related Experiment Videos

Junctional complex revisited by high-resolution scanning electron microscopy.

Francesca Testa Riva1, Silvia Serreli, Francesco Loy

  • 1Department of Cytomorphology, University of Cagliari, Cittadella Universitaria I-09042 Monserrato, Cagliari, Italy. riva@unica.it

Microscopy Research and Technique
|September 25, 2003
PubMed
Summary
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This study reveals the ultrastructure of cell junctions using advanced microscopy techniques. New methods allow visualization of particle clusters, identifying them as desmosomes and junctional complexes.

Area of Science:

  • Cell Biology
  • Microscopy
  • Biophysics

Background:

  • Understanding the ultrastructure of intercellular junctions is crucial for cell adhesion and communication.
  • Conventional microscopy techniques have limitations in visualizing the detailed morphology of junctional complexes.

Purpose of the Study:

  • To correlate ultrastructural morphology of junctional complexes using transmission electron microscopy (TEM) and high-resolution scanning electron microscopy (HRSEM).
  • To investigate the inner side of the plasmalemma by removing cytoplasmic organelles.

Main Methods:

  • A novel modification of the osmium tetroxide maceration technique was employed.
  • Transmission electron microscopy (TEM) and high-resolution scanning electron microscopy (HRSEM) were utilized.
  • Cytoplasmic organelles were removed to allow inspection of the inner plasmalemma.

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Main Results:

  • A continuous band of tightly packed particles was observed at the apical portion of lateral membranes.
  • Irregular clusters of particles, identified as desmosomes, were found below this band.
  • The continuous band likely represents the zonulae occludens and adherens.

Conclusions:

  • The study successfully correlated TEM and HRSEM findings of junctional complexes.
  • Observed particles are hypothesized to be peripheral membrane proteins linking the cytoskeleton to the plasmalemma.
  • The modified osmium tetroxide maceration technique provides new insights into junctional complex ultrastructure.