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Related Experiment Video

Updated: May 5, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Low-affinity LFA1-dependent outside-in signaling mediates avidity modulation via the Rabin8-Rab8 axis.

Naoyuki Kondo1, Yoshihiro Ueda1, Tatsuo Kinashi1

  • 1Department of Molecular Genetics, Institute of Biomedical Science, Kansai Medical University, Hirakata, Osaka 573-1010, Japan.

PNAS Nexus
|August 22, 2024
PubMed
Summary

The small GTPase Rab8 is crucial for transporting lymphocyte function-associated antigen 1 (LFA1) to cell contact areas, enhancing adhesion by increasing LFA1 avidity, not affinity.

Keywords:
Rab8Rabin8integrin activationoutside-in signalingsingle-molecule imaging

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Leukocyte integrin lymphocyte function-associated antigen 1 (LFA1) and intercellular adhesion molecules (ICAMs) mediate lymphocyte interactions vital for trafficking and antigen recognition.
  • Integrin function is regulated by ligand-binding affinity and avidity, with mechanisms for low-affinity binding initiation remaining unclear.

Purpose of the Study:

  • To investigate the role of small GTPase Rab8 in the intracellular transport and accumulation of LFA1 at cell contact sites.
  • To elucidate the molecular mechanisms by which low-affinity LFA1-dependent outside-in signaling regulates LFA1 transport and adhesion.

Main Methods:

  • Utilized super-resolution microscopy to observe Rab8 and LFA1 co-localization.
  • Employed Rab8 inactivation and activation strategies to assess effects on cell adhesion and LFA1 density.
  • Performed single-molecule imaging of ICAM1 on supported lipid bilayers to analyze LFA1-ICAM1 interactions.

Main Results:

  • Rab8 was found to co-localize with LFA1 in vesicles near the cell contact membrane.
  • Rab8 inactivation decreased ICAM1-dependent adhesion and LFA1 density at contact areas.
  • Active Rab8 increased cell adhesiveness and LFA1 accumulation via co-trafficking, primarily modulating LFA1 avidity.

Conclusions:

  • The Rabin8-Rab8 axis is critical for initiating LFA1 transport to the cell contact area.
  • Low-affinity conformation-dependent outside-in signaling regulates LFA1 avidity through Rab8-mediated transport.
  • These findings highlight a novel mechanism for controlling lymphocyte adhesion and trafficking.