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Control of cell adhesion and migration by podocalyxin. Implication of Rac1 and Cdc42

Darío Fernández1, Angélica Horrillo, Carolina Alquezar

  • 1CIBER de Enfermedades Raras, Madrid, Spain.

Biochemical and Biophysical Research Communications
|February 12, 2013
PubMed

Insights

Podocalyxin (PODXL) enhances cell adhesion and migration. Its ectodomain is crucial for adhesion, while the cytoplasmic domain is vital for both processes, involving Rac1 GTPase activity.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Podocalyxin (PODXL) is a sialomucin found in kidney podocytes and various tumors.
  • Its exact pathophysiological role and the specific domains mediating its functions remain unclear.

Purpose of the Study:

  • To identify the specific domains of PODXL responsible for its effects on cell adhesion, migration, and cell-cell interactions.
  • To investigate the correlation between PODXL function and the activity of Rac1 and Cdc42 GTPases.

Main Methods:

  • Analysis of cell adhesion and migration responses using deletion mutants of human PODXL expressed in CHO cells.
  • Assessment of Rac1 and Cdc42 GTPase activities.
  • Gene silencing of rac1 to evaluate its role in PODXL-mediated effects.

Main Results:

  • PODXL ectodomain integrity is essential for enhanced cell adhesion but not migration.
  • PODXL cytoplasmic domain integrity is required for both cell adhesion and migration.
  • Deletion of the PODXL carboxy-terminal DTHL domain specifically impaired cell adhesion.
  • Rac1 and Cdc42 GTPase activities correlated with PODXL-induced changes in cell adhesion and migration.
  • rac1 gene silencing abolished PODXL's enhancement of cell adhesion.

Conclusions:

  • The PODXL ectodomain and cytoplasmic domain play distinct roles in regulating cell adhesion and migration.
  • PODXL-mediated enhancement of cell adhesion is dependent on Rac1 GTPase activity.

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