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Related Experiment Videos

Complementary roles for CD2 and LFA-1 adhesion pathways during T cell activation.

P E Moingeon1, J L Lucich, C C Stebbins

  • 1Laboratory of Immunobiology, Dana-Farber Cancer Institute, Boston, MA 02115.

European Journal of Immunology
|March 1, 1991
PubMed
Summary

T cell receptor (TcR) activation rapidly enhances LFA-1 adhesion but not CD2 adhesion. These distinct adhesion pathways play complementary roles in immune responses.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • T cell adhesion is crucial for immune responses.
  • T cell receptor (TcR) triggering and adhesion molecule function are key aspects of T cell activation.

Purpose of the Study:

  • To investigate the influence of TcR triggering on T cell adhesion functions, specifically LFA-1 and CD2.
  • To elucidate the roles of Protein Kinase C (PKC) and cyclic AMP (cAMP) in modulating these adhesion pathways.

Main Methods:

  • Systematic investigation of T cell adhesion function following TcR triggering.
  • Analysis of LFA-1 and CD2 adhesion modulation by TcR stimulation, PKC, and cAMP.
  • Assessment of surface redistribution of adhesion molecules.

Main Results:

Related Experiment Videos

  • TcR activation rapidly augments LFA-1 adhesion, while CD2 adhesion remains optimal and unchanged.
  • PKC activation enhances LFA-1 adhesion, whereas cAMP reduces it without affecting CD2-LFA-3 interactions.
  • LFA-1 pathway up-regulation occurs without surface redistribution, suggesting a high-affinity binding state.

    • Conclusions:

    • CD2 adhesion functions independently of TcR, suggesting a role in initiating cell interactions before TcR engagement.
    • LFA-1 and CD2 adhesion pathways are complementary, with CD2 acting upstream of LFA-1 in the immune response.