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Related Experiment Video

Updated: Jul 6, 2026

Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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Developmental control of integrin expression regulates Th2 effector homing.

Seung-Hyo Lee1, Joseph E Prince, Muhammad Rais

  • 1Department of Immunology, Baylor College of Medicine, Houston, TX 77030, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|March 21, 2008
PubMed
Summary

T helper 2 (Th2) cells require the LFA-1 complex for homing, unlike Th1 cells. This is due to reduced expression of CD29 on Th2 cells, impacting allergic disease and offering new therapeutic targets.

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Area of Science:

  • Immunology
  • Cell Biology
  • Integrin Biology

Background:

  • Integrin CD18, part of the LFA-1 complex, is crucial for Th2 cell homing but not Th1 cell homing.
  • The underlying mechanism for this differential requirement remains unclear.

Purpose of the Study:

  • To investigate the mechanism behind Th2 effector responses' reliance on the LFA-1 complex.
  • To elucidate the distinct integrin usage for homing between Th1 and Th2 cells.

Main Methods:

  • Utilized CD11a-deficient mice and LFA-1 inhibitors.
  • Assessed in vitro T cell differentiation and function.
  • Evaluated Th2-dependent allergic lung disease and Th1-dependent Leishmania major infection models.
  • Measured recruitment of IL-4 and IFN-gamma secreting cells and in vitro Th2 cell adhesion.
  • Analyzed CD29 expression on Th1 and Th2 cells.

Main Results:

  • CD11a-deficient T cells exhibited normal in vitro differentiation and function.
  • Th2-dependent allergic lung disease was significantly reduced in CD11a null mice and with LFA-1 inhibitors.
  • Th1-dependent Leishmania major infection control was enhanced in CD11a null mice.
  • Recruitment of IL-4-secreting cells and Th2 cell adhesion were impaired.
  • Markedly reduced CD29 expression was observed on Th2 cells but not Th1 cells.

Conclusions:

  • Murine Th1 and Th2 cells employ distinct integrins for homing.
  • Reduced CD29 expression on Th2 cells necessitates CD11a for their homing.
  • These findings suggest novel integrin-based therapeutic strategies for Th2 cell-mediated diseases.