References
Query Results -- Details
MGI Accession ID: MGI:3581469
J Number: J:99199
Other Accession IDs:
Title: Host control of Mycobacterium tuberculosis is regulated by 5-lipoxygenase-dependent lipoxin production.
Authors: Bafica A; Scanga CA; Serhan C; Machado F; White S; Sher A; Aliberti J
Journal: J Clin Invest
Volume: 115
Issue: 6
Date: 2005 Jun 1
Year: 2005
Pages: 1601-1606
Review Status: Peer Reviewed
Abstract:
Th1 type cytokine responses are critical in the control of Mycobacterium tuberculosis infection. Recent findings indicate that 5-lipoxygenase-dependent (5-LO-dependent) lipoxins regulate host IL-12 production in vivo. Here, we establish lipoxins as key chemical mediators in resistance to M. tuberculosis infection. High levels of lipoxin A(4) (LXA(4)) were detected in sera from infected WT but not infected 5-LO-deficient mice. Moreover, lungs from M. tuberculosis-infected 5-lo(-/-) animals showed increased IL-12, IFN-gamma, and NO synthase 2 (NOS2) mRNA levels compared with the same tissues in WT mice. Similarly, splenocyte recall responses were enhanced in mycobacteria-infected 5-lo(-/-) versus WT mice. Importantly, bacterial burdens in 5-lo(-/-) lungs were significantly lower than those from WT mice, and this enhancement in the resistance of the 5-lo(-/-) animals to M. tuberculosis was completely prevented by administration of a stable LXA(4) analog. Together our results demonstrate that lipoxins negatively regulate protective Th1 responses against mycobacterial infection in vivo and suggest that the inhibition of lipoxin biosynthesis could serve as a strategy for enhancing host resistance to M. tuberculosis.
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