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Updated: Jul 8, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
09:14

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Nonmuscle myosin heavy chain IIA mediates integrin LFA-1 de-adhesion during T lymphocyte migration

Nicole A Morin1, Patrick W Oakes, Young-Min Hyun

  • 1Department of Surgery, Rhode Island Hospital and Brown Medical School, Providence, RI 02903, USA.

The Journal of Experimental Medicine
|January 16, 2008
PubMed

Insights

Nonmuscle myosin IIA (MyH9) is crucial for T lymphocyte migration by linking to LFA-1 adhesion molecules. MyH9 regulates cell de-adhesion at the uropod, ensuring proper tail detachment and efficient lymphocyte movement on ICAM-1.

Area of Science:

  • Immunology
  • Cell Biology
  • Biophysics

Background:

  • Dynamic lymphocyte migration relies on precise control of cell adhesion and de-adhesion.
  • Integrin lymphocyte function-associated antigen (LFA)-1 mediates T lymphocyte adhesion to intercellular adhesion molecule (ICAM)-1.
  • The mechanisms regulating LFA-1 de-adhesion during T cell migration remain poorly understood.

Purpose of the Study:

  • To investigate the role of nonmuscle myosin heavy chain IIA (MyH9) in LFA-1 de-adhesion during T lymphocyte migration.
  • To elucidate the molecular mechanisms by which MyH9 influences LFA-1-mediated cell adhesion and detachment.

Main Methods:

  • Recruitment of MyH9 to LFA-1 at the uropod of migrating T lymphocytes was assessed.
  • The effects of inhibiting MyH9-LFA-1 association on T lymphocyte migration and uropod dynamics were analyzed.
  • Total internal reflection fluorescence microscopy was used to visualize LFA-1 localization and dynamics in the cell-substrate contact zone.

Main Results:

  • MyH9 is recruited to LFA-1 at the uropod of migrating T lymphocytes.
  • Inhibition of MyH9-LFA-1 association caused uropod elongation, impaired tail detachment, and reduced migration on ICAM-1.
  • LFA-1 de-adhesion was dependent on avidity regulation, with MyH9 acting as a mechanical linker to the cytoskeleton.
  • Inactive LFA-1 localized to the posterior and active LFA-1 to the anterior of polarized T lymphocytes.

Conclusions:

  • MyH9 is essential for efficient LFA-1 de-adhesion during T lymphocyte migration.
  • MyH9 acts as a critical mechanical link between LFA-1 and the cytoskeleton, facilitating tail detachment.
  • Uropodal adhesion is regulated by LFA-1 avidity, with MyH9 playing a key role in this process.

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