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Gamma interferon in experimental leprosy
J L Krahenbuhl1, L D Sibley, G T Chae
1Gillis W. Long Hansen's Disease Center, Carville, Louisiana 70721.
Diagnostic Microbiology and Infectious Disease
|September 1, 1990
Summary
Preactivated macrophages can fight leprosy bacilli, but high bacterial load makes them unresponsive to IFN-gamma. Leprosy lesion macrophage function depends on local conditions, not systemic factors.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Leprosy is a chronic infectious disease caused by Mycobacterium leprae.
- Macrophage (MAC) dysfunction is central to leprosy pathogenesis.
- Understanding MAC function in leprosy lesions is critical for effective treatment.
Purpose of the Study:
- To investigate the functional state of macrophages within lepromatous (LL) leprosy lesions.
- To determine the impact of Mycobacterium leprae burden on host macrophage activation.
- To elucidate the factors influencing macrophage responsiveness to immune stimuli in leprosy.
Main Methods:
- Analysis of macrophage (MAC) function in lepromatous leprosy lesions.
- Assessment of MAC response to Interferon-gamma (IFN-gamma) in the presence of M. leprae.
- Investigation of prostanoid involvement in modulating MAC function.
Main Results:
- Preactivated MACs can initially combat M. leprae.
- A high intracellular burden of M. leprae induces a refractory state in host MACs, impairing IFN-gamma activation.
- Leprosy lesion MAC function is influenced by local conditions, including bacterial load and prostanoid production.
Conclusions:
- Leprosy lesion macrophage function is site-specific and cannot be extrapolated from other anatomical sites.
- Activation of resident lepromatous MACs is unlikely to clear bacilli.
- Bacillary clearance in LL lesions likely relies on the recruitment of new, competent macrophages.