Journal
INFECTION AND IMMUNITY
Volume 72, Issue 4, Pages 2400-2404Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/IAI.72.4.2400-2404.2004
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Mycobacterium tuberculosis possesses agonists for several Toll-like receptors (TLRs), yet mice with single TLR deletions are resistant to acute tuberculosis. MyD88(-/-) mice were used to examine whether TLRs play any role in protection against aerogenic M. tuberculosis H37Rv infection. MyD88(-/-) mice failed to control mycobacterial replication and rapidly succumbed. Moreover, expressions of interleukin 12, tumor necrosis factor alpha, gamma interferon, and nitric oxide synthase 2 were markedly decreased in the knockout animals. These results argue that resistance to M. tuberculosis must depend on MyD88-dependent signals mediated by an as-yet-undetermined TLR or a combination of TLRs.
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