Cell-junctional and cytoskeletal organization in mouse blastocysts lacking E-cadherin

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M Ohsugi1, L Larue, H Schwarz

  • 1Max-Planck-Institut für Immunbiologie, Freiburg, Germany.

Developmental Biology
|May 15, 1997
PubMed

Insights

E-cadherin is crucial for mouse embryonic development, affecting trophectoderm formation. Its absence disrupts cell junctions and actin organization, impacting early embryo development.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Trophectoderm epithelium formation is the initial differentiation in mouse embryos.
  • E-cadherin, a cell adhesion molecule, is vital for this process.
  • Embryos lacking E-cadherin exhibit developmental abnormalities.

Purpose of the Study:

  • To investigate the developmental potential of E-cadherin-negative embryos.
  • To analyze cell junction and cytoskeleton organization in these embryos.
  • To understand E-cadherin's regulatory role in forming the cadherin-catenin complex.

Main Methods:

  • Utilized antibodies against alpha-, beta-, and gamma-(plakoglobin)-catenin.
  • Examined junctional proteins (ZO-1, occludin, desmoglein1, connexin43) and cytoskeletal proteins (EndoA).
  • Assessed membrane localization and expression levels of key proteins and actin organization.

Main Results:

  • E-cadherin absence led to abnormal membrane localization of alpha- and beta-catenin, and ZO-1.
  • Reduced expression of alpha- and beta-catenin was observed in E-cadherin-negative embryos.
  • Cortical actin filament organization was disrupted, though other junctional proteins remained localized.

Conclusions:

  • E-cadherin plays a regulatory role in establishing the cadherin-catenin complex.
  • Defects in molecular architecture of cell junctions and actin organization underlie abnormal morphogenesis.
  • Despite normal individual structures in electron microscopy, the supermolecular assembly is compromised.

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