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Antigen-specific suppressor cells in subclinical leprosy infection
Lancet (London, England)
|December 19, 1981
Summary
Long-term exposure to Mycobacterium leprae (ML) primes immune cells to suppress lympho-proliferative responses. This ML-specific suppression assay can evaluate leprosy vaccine efficacy in engaging immune regulatory networks.
Area of Science:
- Immunology
- Infectious Diseases
- Mycobacterial Infections
Background:
- Leprosy, caused by Mycobacterium leprae (ML), involves complex immune responses.
- Understanding immune regulation is crucial for developing effective leprosy vaccines.
Purpose of the Study:
- To develop and validate an in vitro assay for measuring ML-specific suppressor cell activity.
- To assess the correlation between duration of exposure to ML and the generation of suppressor cells.
Main Methods:
- A two-stage in vitro culture system was employed.
- Mitomycin-treated cells primed with ML antigens were used to assess suppression of lympho-proliferative responses.
- Responses to ML, purified protein derivative of tuberculin, and streptokinase-streptodornase were measured.
Main Results:
- Long-term exposure (>3 years) to ML in healthy subjects induced strong ML-specific suppression (>40% in 11/12).
- Short-term exposure (3 months to 3 years) showed significantly less suppression (<40% in 12/15).
- Suppression was antigen-specific, as cells primed with ML preferentially suppressed ML responses.
Conclusions:
- In vitro generation of ML-specific suppressor cells reflects a mature, regulated immune response to leprosy.
- Premature induction or in vivo activation of these suppressor cells may contribute to lepromatous leprosy.
- The developed assay can evaluate the immunomodulatory potential of leprosy vaccines.