Journal
IMMUNOLOGY
Volume 109, Issue 2, Pages 295-299Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-2567.2003.01645.x
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Funding
- NHLBI NIH HHS [HL64565] Funding Source: Medline
- NIAID NIH HHS [AI-37844, R01 AI037844] Funding Source: Medline
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With a view to determining whether failure of mice to resolve Mycobacterium tuberculosis (Mtb) infection is a consequence of downregulation of T helper 1 (Th1) immunity by interleukin (IL)-10, mice deleted of the gene for IL-10 were compared with wild-type (WT) mice in terms of their ability to make IL-10 mRNA, generate Th1-mediated immunity [as measured by synthesis of mRNA for interferon-gamma (IFN-gamma)], IL-12p40 and inducible nitric oxide synthase (iNOS), and to control lung infection. It was found that the response of WT mice to infection included a substantial and sustained increase in IL-10 mRNA synthesis in the lungs. A Th1 response in the lungs of WT and IL-10(-/-) mice was evidenced by a large and sustained increase in the synthesis of mRNA for IFN-gamma, IL-12p40 and iNOS, with somewhat higher levels of these mRNA species being made in the lungs of IL-10(-/-) mice, particularly at an early stage of infection. However, IL-10(-/-) mice were no more capable than WT mice at combating infection.
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