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Microtubule-destabilizing agents induce focal adhesion structure disorganization and anoikis in cancer cells

Réna G Deschesnes1, Alexandre Patenaude, Jean L C Rousseau

  • 1Centre de Recherche, Unité des Biotechnologies et de Bioingénierie, Centre Hospitalier Universitaire de Québec, Hôpital Saint-François d'Assise, 10 rue de l'Espinay, Québec, Québec, Canada G1L 3L5.

The Journal of Pharmacology and Experimental Therapeutics
|November 14, 2006
PubMed

Insights

Microtubule disruption triggers cell death (anoikis) by altering cell adhesion dynamics. This process involves initial adhesion strengthening followed by detachment and cell rounding, ultimately leading to apoptosis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Microtubule disruption affects cell cytoskeleton and adhesion, but its role in apoptosis is not fully understood.
  • Understanding the kinetics of cell adhesion changes during microtubule disruption is crucial for elucidating apoptosis pathways.

Purpose of the Study:

  • To investigate the functional and molecular adhesion kinetics induced by microtubule disruption-mediated apoptosis.
  • To determine the role of specific signaling pathways and proteins in this process.

Main Methods:

  • Treatment of cells with antimicrotubule agents.
  • Analysis of cell adhesion, focal adhesion dynamics, and actin cytoskeleton organization.
  • Assessment of protein phosphorylation (paxillin, ERK, p38, JNK) and integrin-linked kinase (ILK) activity.

Main Results:

  • Antimicrotubules induced a biphasic adhesion response: initial increase followed by a sharp decrease, preceding apoptosis.
  • Cell adhesion loss correlated with focal adhesion disorganization, actin stress fiber breakdown, cell rounding, and detachment.
  • Sustained paxillin phosphorylation occurred before apoptosis, dependent on extracellular signal-regulated kinase (ERK) and p38 activation.
  • Overexpression of integrin-linked kinase (ILK) protected against cell death.

Conclusions:

  • Antimicrotubule agents induce anoikis by disrupting the integrity of focal adhesions.
  • The process involves a specific sequence of cytoskeletal and adhesion changes regulated by key signaling pathways.

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