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Related Experiment Videos

Spatial mapping of integrin interactions and dynamics during cell migration by image correlation microscopy.

Paul W Wiseman1, Claire M Brown, Donna J Webb

  • 1Department of Chemistry, McGill University, 801 Sherbrooke St. W. Montreal, Quebec H3A 2K6, Canada.

Journal of Cell Science
|October 14, 2004
PubMed
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Alpha5-integrin forms small, submicroscopic clusters in migrating cells before visible organization. These integrins are more concentrated and clustered in nascent adhesions, initiating cell adhesion.

Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Integrins are crucial for cell adhesion and migration.
  • Understanding integrin dynamics in real-time is essential for cell biology.

Purpose of the Study:

  • To investigate the density, dynamics, and interactions of alpha5-integrin in migrating cells.
  • To characterize the role of alpha5-integrin in the early stages of cell adhesion formation.

Main Methods:

  • Extended image correlation microscopy (ICM) methodology.
  • Retrospective analysis of alpha5-integrin behavior in live cells.

Main Results:

  • Alpha5-integrin exists in submicroscopic clusters (3-4 integrins) prior to visible organization.
  • In nascent adhesions (paxillin-positive), alpha5-integrin is 1.4x more concentrated, 4.5x more clustered, and less mobile.

Related Experiment Videos

  • Mature adhesions show high integrin density (~900/µm²).
  • Alpha5-integrin and alpha-actinin form a complex that moves together throughout the cell.

    • Conclusions:

    • Integrins initiate adhesion formation in nascent adhesions despite lacking visible organization.
    • Distinct dynamics of alpha5-integrin, alpha-actinin, and paxillin occur during adhesion disassembly.