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* Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523; and
Trudeau Institute, Saranac Lake, NY 12983
The production of immunosuppressive cytokines, such as IL-10 and
TGF-
, has been documented in individuals diagnosed with active
tuberculosis. In addition, IL-10 production is increased within the
lungs of mice that have chronic mycobacterial infection. Therefore, we
hypothesized that the down-regulatory properties of IL-10 might
contribute to the reactivation of chronic Mycobacterium
tuberculosis infection in mice. To determine the influence of
IL-10 on the course of infection, transgenic mice producing increased
amounts of IL-10 under the control of the IL-2 promotor were infected
with M. tuberculosis via the respiratory route. Mice
that overexpressed IL-10 showed no increase in susceptibility during
the early stages of infection, but during the chronic phase of the
infection showed evidence of reactivation tuberculosis with a highly
significant increase in bacterial numbers within the lungs.
Reactivation was associated with the formation of macrophage-dominated
lesions, decreased mRNA production for TNF and IL-12p40, and a decrease
in Ag-specific IFN-
secretion. These data support the hypothesis
that IL-10 plays a pivotal role during the chronic/latent stage of
pulmonary tuberculosis, with increased production playing a potentially
central role in promoting reactivation
tuberculosis.
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