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Infection and Immunity, November 2006, p. 6092-6099, Vol. 74, No. 11
0019-9567/06/$08.00+0 doi:10.1128/IAI.00621-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
Discovery Research,1 Experimental Pathology and Pharmacology, Schering-Plough Biopharma, 901 California Ave., Palo Alto, California 94304-1104,3 Department of Drug Safety and Metabolism, Schering-Plough Research Institute, Lafayette, New Jersey 078482
Received 18 April 2006/ Returned for modification 2 June 2006/ Accepted 8 August 2006
Interleukin-23 (IL-23), a member of the IL-12 family, is a heterodimeric cytokine that is composed of the p40 subunit of IL-12 plus a unique p19 subunit. IL-23 is critical for autoimmune inflammation, in part due to its stimulation of the proinflammatory cytokine IL-17A. It is less clear, however, if IL-23 is required during the immune response to pathogens. We examined the role of IL-23 during Mycobacterium bovis BCG infection. We found that IL-23 reduces the bacterial burden and promotes granuloma formation when IL-12 is absent. However, IL-23 does not contribute substantially to host resistance when IL-12 is present, as the ability to control bacterial growth and form granulomata is not affected in IL-23p19-deficient mice and mice treated with a specific anti-IL-23p19 antibody. IL-23p19-deficient mice are also able to mount an effective memory response to secondary infection with BCG. While IL-23p19-deficient mice do not produce IL-17A, this cytokine is not necessary for effective control of infection, and antibody blocking of IL-17A in both wild-type and IL-12-deficient mice also has little effect on the bacterial burden. These data suggest that IL-23 by itself does not play an essential role in the protective immune response to BCG infection; however, the presence of IL-23 can partially compensate for the absence of IL-12. Furthermore, neutralization of IL-23 or IL-17A does not increase susceptibility to mycobacterial BCG infection.
Published ahead of print on 21 August 2006.
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