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Related Experiment Videos

Reduced junctional permeability at interrhombomeric boundaries.

S Martinez1, E Geijo, M V Sánchez-Vives

  • 1Instituto de Neurociencias, Universidad de Alicante, Spain.

Development (Cambridge, England)
|December 1, 1992
PubMed
Summary
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Early embryonic development relies on intercellular communication. In chick embryos, gap junctional communication in neuroepithelial cells is reduced at interrhombomeric boundaries, limiting dye transfer and influencing pattern specification.

Area of Science:

  • Developmental biology
  • Neuroscience
  • Cell biology

Background:

  • Intercellular communication is crucial for pattern specification in early embryonic development.
  • Gap junctional communication facilitates the exchange of molecules between adjacent cells, playing a role in developmental processes.

Purpose of the Study:

  • To investigate the role of gap junctional communication in pattern specification during early avian embryonic development.
  • To analyze the positional differences in gap junctional communication properties of chick neuroepithelial cells relative to rhombencephalon segmental partitions.

Main Methods:

  • Microelectrode techniques were employed to study intercellular electrical coupling and dye transfer.
  • Iontophoretic injection of biocytin or Lucifer Yellow was used to assess transjunctional diffusion of molecules between neuroepithelial cells.

Related Experiment Videos

  • Experiments focused on cells within rhombomeres and at interneuromeric boundaries.

    • Main Results:

    • Neuroepithelial cells exhibited electrical coupling regardless of their position relative to interneuromeric boundaries.
    • Transjunctional dye transfer occurred readily between cells within rhombomeres.
    • Dye transfer was significantly restricted when it reached cells at the interneuromeric limits.
    • Label injected into boundary cells did not spread to other cells.

    Conclusions:

    • Avian interrhombomeric boundaries act as sites of reduced junctional permeability during early morphogenesis.
    • This localized reduction in gap junctional communication may play a critical role in establishing segmental patterns in the developing rhombencephalon.