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Related Experiment Videos

Antigen presentation in uveitis

S A Prasad1, D S Gregerson

  • 1Laboratory of Viral Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA.

Eye (London, England)
|January 1, 1997
PubMed
Summary
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This study proposes a novel mechanism for immune tolerance to retinal S-antigen (S-Ag) in rats. Low-affinity T cell receptor (TCR) binding to self-antigen, with specific antigen-presenting cell (APC) function, maintains T cell tolerance, preventing autoimmune uveitis.

Area of Science:

  • Immunobiology
  • Ophthalmology
  • Autoimmunity

Background:

  • Experimental autoimmune uveoretinitis (EAU) models human inflammatory eye diseases.
  • Understanding self/non-self discrimination is crucial for immune tolerance.
  • Mechanisms of T cell tolerance to retinal S-antigen (S-Ag) are investigated.

Purpose of the Study:

  • To investigate novel mechanisms of T cell tolerance to S-Ag.
  • To explore the role of low-affinity T cell receptor (TCR) occupancy in maintaining tolerance.
  • To elucidate the function of specific antigen-presenting cells (APCs) in regulating T cell activation.

Main Methods:

  • Utilized EAU model in LEW rats.
  • Employed T cell lines and hybridomas specific for S-Ag.

Related Experiment Videos

  • Investigated novel APC functions and TCR co-ligands.

    • Main Results:

    • Identified a novel APC function essential for autoreactive T cell activation.
    • Demonstrated that incomplete T cell activation results from lack of a TCR co-ligand.
    • Showed that activation of autoreactive T cells is restricted to specific APCs.

    Conclusions:

    • Proposed a novel mechanism of T cell tolerance involving low-affinity TCR occupancy by self-antigen.
    • This mechanism may act with known mechanisms to maintain tolerance to S-Ag.
    • Specific APCs and TCR co-ligands are critical for regulating T cell responses in autoimmune diseases.