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Related Experiment Videos

Abnormal T suppressor cell function in juvenile rheumatoid arthritis.

E D Silverman1, C Somma, M M Khan

  • 1Department of Pediatrics, University of Toronto, Hospital for Sick Children, Ontario, Canada.

Arthritis and Rheumatism
|February 1, 1990
PubMed
Summary

Patients with active juvenile rheumatoid arthritis (JRA) exhibit abnormal T suppressor cell function. This defect, linked to impaired cAMP signaling in T suppressor cell precursors, is reversible and specific to active disease.

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Area of Science:

  • Immunology
  • Pediatric Rheumatology
  • Cellular Immunology

Background:

  • Juvenile rheumatoid arthritis (JRA) is a chronic childhood inflammatory disease.
  • JRA presents with arthritis and significant immunoregulatory abnormalities.
  • The precise mechanisms underlying JRA's immunopathology remain incompletely understood.

Purpose of the Study:

  • To investigate the function of T suppressor cells in patients with JRA.
  • To analyze the role of histamine and cAMP in T suppressor cell activity in JRA.
  • To identify potential immunoregulatory defects contributing to JRA pathogenesis.

Main Methods:

  • Purification of T suppressor cell precursors (CD8+, CD28-) from JRA patients' peripheral blood.
  • Induction of suppressor activity using histamine or concanavalin A.

Related Experiment Videos

  • Assessment of T cell proliferation inhibition and intracellular cAMP accumulation following histamine stimulation.

    • Main Results:

    • Patients with active JRA demonstrated impaired histamine-inducible T suppressor cell function.
    • A failure in intracellular cAMP accumulation after histamine treatment was observed in active JRA cases.
    • Clinically inactive JRA patients, cystic fibrosis patients, and pediatric controls exhibited normal T suppressor cell function and cAMP response.

    Conclusions:

    • Active JRA is associated with a reversible defect in T suppressor cell function.
    • This defect involves a failure of T suppressor cell precursors to accumulate intracellular cAMP upon immune stimulation.
    • The findings suggest a specific immunoregulatory abnormality in active JRA that may be targeted for therapeutic intervention.