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Related Experiment Videos

The immunological synapse and CD28-CD80 interactions.

S K Bromley1, A Iaboni, S J Davis

  • 1Department of Pathology and Immunology, Washington University School of Medicine, 660 S. Euclid Ave, St. Louis MO, USA.

Nature Immunology
|November 20, 2001
PubMed
Summary
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CD28 costimulatory molecules do not directly enhance T cell receptor signaling or adhesion. Instead, CD28 functions within the immunological synapse to create an environment favoring potent secondary signaling molecules for T cell activation.

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Signaling

Background:

  • The two-signal model describes T cell activation via T cell receptor (TCR) signaling and costimulatory molecules.
  • Adhesion molecules enhance TCR-MHC-peptide recognition during immune responses.
  • CD28's structure suggests dual roles in adhesion and costimulation, blurring traditional distinctions.

Purpose of the Study:

  • To investigate the specific functions of CD28 in T cell activation.
  • To determine if CD28 acts as an adhesion molecule or directly enhances TCR-MHC-peptide interactions.
  • To elucidate the role of CD28 within the immunological synapse.

Main Methods:

  • Analysis of CD28 binding properties on naïve T cells.
  • Assessment of CD28's capacity to enhance TCR-MHC-peptide interactions.

Related Experiment Videos

  • Investigation of the microenvironment generated by the immunological synapse.

    • Main Results:

    • CD28 on naïve T cells does not support cell adhesion.
    • CD28 exhibits minimal to no direct enhancement of TCR-MHC-peptide interactions.
    • The immunological synapse creates a specialized microenvironment.

    Conclusions:

    • CD28's primary role is not adhesion or direct enhancement of TCR signaling.
    • CD28 likely functions by influencing the cellular microenvironment within the immunological synapse.
    • This microenvironment favors interactions with potent secondary signaling molecules, crucial for T cell activation.