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Mouse zygotes express endogenous lectins.

M Legge1, M H Sellens

  • 1Department of Biology, University of Essex, Colchester, United Kingdom.

Molecular Reproduction and Development
|August 1, 1990
PubMed
Summary
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Mouse oocytes and zygotes express endogenous lectins (sugar-binding proteins) involved in cell interactions. Fertilization significantly enhances lectin expression, which is temperature-dependent.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Glycobiology

Background:

  • Cell interactions are crucial for mammalian development.
  • Carbohydrate-containing macromolecules (glycoconjugates) mediate these interactions.
  • The role of endogenous lectins in early mouse development is not fully understood.

Purpose of the Study:

  • To investigate the presence and characteristics of endogenous lectins in mouse oocytes and zygotes.
  • To determine if these lectins are involved in early cell interactions during mouse development.

Main Methods:

  • Utilized fluorescein-labeled synthetic glycoproteins to probe for lectin expression.
  • Incubated mouse oocytes and zygotes at different temperatures (4°C and 37°C) and durations.
  • Assessed lectin binding activity for various sugars (fucose, mannose, galactose, glucose, lactose).

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Main Results:

  • Unfertilized oocytes showed minimal lectin expression at 37°C, with low binding for fucose, mannose, and galactose.
  • Zygotes exhibited significant expression of three distinct lectin classes, binding fucose/mannose, glucose/galactose, and lactose.
  • Lectin expression and detection were markedly temperature-dependent, with optimal binding at 37°C after 2 hours.

Conclusions:

  • A low level of endogenous lectin expression in mouse oocytes is significantly upregulated after fertilization.
  • Endogenous lectins play a role in early mouse development, with their expression or detection being temperature-sensitive.