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Membrane microdomain formation is crucial in epiboly during gastrulation of medaka

Tomoko Adachi1, Chihiro Sato, Ken Kitajima

  • 1Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan.

Biochemical and Biophysical Research Communications
|May 22, 2007
PubMed

Insights

Membrane microdomains, crucial for embryonic development, regulate cell adhesion during epiboly. Cholesterol levels reversibly control microdomain formation and normal embryo development.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biochemistry

Background:

  • Membrane microdomains are specialized lipid rafts enriched in cholesterol and sphingomyelin.
  • These microdomains contain specific glycoproteins, such as those with Lewis X structures, involved in cellular processes.

Purpose of the Study:

  • To investigate the role of membrane microdomains in the epiboly process during early embryonic development.
  • To determine the impact of microdomain disruption on embryonic cell adhesion and development.

Main Methods:

  • Isolation and characterization of membrane microdomains from early gastrula embryos.
  • Disruption of microdomains using methyl beta-cyclodextrin (MBCD) and C2-ceramide.
  • Assessment of epiboly progression and cell adhesion in treated embryos.
  • Restoration of microdomains and epiboly by exogenous cholesterol supplementation.

Main Results:

  • Disruption of membrane microdomains by MBCD and C2-ceramide impaired epiboly.
  • Microdomain disruption led to blastoderm cell detachment, indicating a role in cell adhesion.
  • Exogenous cholesterol restored microdomain integrity and normalized epiboly, demonstrating reversibility.

Conclusions:

  • Membrane microdomains are essential for normal epiboly in early embryos.
  • Cholesterol-dependent microdomain formation plays a critical, reversible role in regulating embryonic development.
  • Microdomains are vital for maintaining blastodermal cell adhesion during epiboly.

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