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Published on: December 19, 2014
Influence of cryptococcal antigens on cell-mediated immunity
1Department of Botany-Microbiology, University of Oklahoma, Norman 73019.
Reviews of Infectious Diseases
|July 1, 1988
Summary
Cryptococcal antigen in patients with cryptococcosis can suppress crucial cell-mediated immunity. This immune suppression, mediated by suppressor cells, correlates with antigen levels and disease severity.
Area of Science:
- Immunology
- Mycology
- Infectious Diseases
Background:
- Cryptococcosis, a fatal disease, is caused by Cryptococcus neoformans.
- Elevated cryptococcal antigen levels in patients correlate with disease severity.
- Cell-mediated immunity is vital for protection against Cryptococcus neoformans.
Purpose of the Study:
- To investigate the role of cryptococcal antigen in modulating the host immune response.
- To understand the mechanisms by which Cryptococcus neoformans evades immune surveillance.
- To explore the relationship between antigen levels, immune suppression, and disease severity.
Main Methods:
- Utilized a murine model of cryptococcosis.
- Assessed cell-mediated immunity via delayed-type hypersensitivity response.
- Analyzed serum samples for cryptococcal antigen and anticryptococcal antibodies.
- Investigated the induction of suppressor cells by cryptococcal antigen and infected sera.
Main Results:
- Cryptococcal antigen contains epitopes recognized by cell-mediated immunity.
- Sera from infected mice induced suppressor cells, inhibiting cell-mediated immunity.
- Higher cryptococcal antigen levels correlated with increased immune suppression.
- Specific suppression of delayed-type hypersensitivity and protective immunity was observed upon antigen injection.
Conclusions:
- Cryptococcal antigen actively suppresses cell-mediated immunity through the induction of suppressor cells.
- Immune suppression induced by antigen correlates with disease severity in cryptococcosis.
- Antigen-specific suppressor cells and factors play a significant role in the pathogenesis of cryptococcosis.
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