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Decrease of gap junction number in the rat neural tube between ED 11 and ED 15

I Hähnlein1, T Schuster

  • 1Institut für Anatomie, Medizinischen Fakultät, Humboldt-Universität zu Berlin.

Journal Fur Hirnforschung
|January 1, 1994
PubMed
Summary
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Neuroepithelial cells in rat embryos form tight and desmosome-like junctions. Gap junctions appear early but decrease as cells differentiate, suggesting a role in neural development.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Neuroscience

Background:

  • Neuroepithelial cells form the neural tube during embryonic development.
  • Cell-cell junctions are crucial for tissue integrity and communication.
  • The role of specific junction types during early neural development requires further elucidation.

Purpose of the Study:

  • To investigate the types and distribution of cell junctions in the developing rat neural tube.
  • To understand the dynamic changes in gap junctions during neuroepithelial cell differentiation.

Main Methods:

  • Electron microscopy was used to examine the apical regions of neuroepithelial cells.
  • Analysis focused on embryonic days 11, 12, 14, and 15 in rat embryos.

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Main Results:

  • Extended junctional complexes, including tight junctions and desmosome-like contacts, were observed.
  • Intercellular gap junctions were present on days 11 and 12, alongside intracellular annulated gap junctions.
  • A decrease in gap junction numbers was noted by days 14 and 15.

Conclusions:

  • The formation and subsequent decrease of gap junctions correlate with neuroepithelial cell development and differentiation.
  • Annulated gap junctions may arise from the invagination of intercellular gap junctions during cellular changes.
  • Junctional complex dynamics play a significant role in neural tube formation and maturation.