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Related Experiment Videos

Sarcoidosis is not associated with a generalized defect in T cell suppressor function.

C Saltini1, J R Spurzem, M R Kirby

  • 1Pulmonary Branch, National Heart, Lung, and Blood Institute, Bethesda, MD 20892.

Journal of Immunology (Baltimore, Md. : 1950)
|March 15, 1988
PubMed
Summary

Pulmonary sarcoidosis involves increased CD4+ T cells, but CD8+ T cells function normally. Sarcoid CD8+ T cells can proliferate and suppress CD4+ T cells, indicating no generalized CD8+ T cell abnormality.

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Area of Science:

  • Immunology
  • Pulmonology

Background:

  • Pulmonary sarcoidosis is characterized by CD4+ T cell expansion in the lungs.
  • This expansion is linked to local IL-2 release by activated CD4+ T cells.
  • The role of CD8+ T cells in sarcoidosis pathogenesis is unclear.

Purpose of the Study:

  • To investigate the function and activation status of CD8+ T cells in pulmonary sarcoidosis.
  • To determine if CD8+ T cells exhibit generalized abnormalities in sarcoidosis patients.

Main Methods:

  • Assessed IL-2 receptor (IL-2R) expression on T cells from sarcoidosis patients' lungs and blood.
  • Stimulated T cells using anti-T3/TCR monoclonal antibody OKT3.
  • Evaluated T cell proliferation and suppressor function in co-culture experiments.

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Main Results:

  • Sarcoid lung CD4+ T cells showed higher spontaneous IL-2R expression than CD8+ T cells.
  • Sarcoid blood and lung CD8+ T cells responded normally to OKT3 stimulation regarding IL-2R expression and proliferation.
  • Sarcoid CD8+ T cells exhibited normal suppressor function in co-culture assays.

Conclusions:

  • Sarcoid CD8+ (suppressor/cytotoxic) T cells are functionally competent.
  • The expansion of CD4+ T cells in pulmonary sarcoidosis is not caused by a generalized CD8+ T cell defect or impaired suppressor function.