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Moesin becomes linked to the plasma membrane in attached neutrophil granulocytes

M Keresztes1, Z Lajtos, J Fischer

  • 1Department of Biochemistry, Albert Szent-Györgyi Medical University, 6701 Szeged, Hungary. margo@biochem.szote.u-szeged.hu

Biochemical and Biophysical Research Communications
|December 5, 1998
PubMed

Insights

Neutrophil adhesion to surfaces triggers the movement of an 80-kDa F-actin-binding protein to the plasma membrane. This protein, identified as moesin, is crucial for neutrophil cell structure and function.

Area of Science:

  • Cell Biology
  • Immunology
  • Biochemistry

Background:

  • Neutrophils play a critical role in the immune response.
  • Cell adhesion is a fundamental process in cell biology and immunology.
  • The actin cytoskeleton is essential for maintaining cell shape and function.

Purpose of the Study:

  • To investigate the changes in protein localization within neutrophils upon adhesion.
  • To identify F-actin-binding proteins that are recruited to the plasma membrane during neutrophil adhesion.
  • To determine the role of moesin in neutrophil adhesion.

Main Methods:

  • Porcine neutrophils were allowed to adhere to a plastic surface for 35 minutes.
  • Protein blotting with labeled F-actin was used to detect F-actin-binding proteins.
  • Plasma membrane and total cell fractions were analyzed.
  • Immunoblotting with anti-moesin antibodies was performed.

Main Results:

  • An 80-kDa F-actin-binding protein was significantly enriched in the plasma membrane fractions of adhered neutrophils.
  • This 80-kDa protein was largely absent in the membrane fractions of non-adhered neutrophils.
  • The 80-kDa protein was identified as moesin.
  • Moesin was a major component of the isolated actin cytoskeleton in both adhered and non-adhered cells.

Conclusions:

  • Neutrophil adhesion to a surface induces the translocation of moesin to the plasma membrane.
  • Moesin is involved in the structural changes of neutrophils upon adhesion.
  • These findings contribute to understanding neutrophil behavior during inflammatory responses.

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