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Infection and Immunity, August 2005, p. 4787-4792, Vol. 73, No. 8
0019-9567/05/$08.00+0 doi:10.1128/IAI.73.8.4787-4792.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Centenary Institute of Cancer Medicine and Cell Biology, Locked Bag No. 6, Newtown, NSW, 2042 Australia,1 Central Clinical School, University of Sydney, New South Wales, 2006 Australia2
Received 15 October 2004/ Returned for modification 23 November 2004/ Accepted 25 February 2005
Although the essential role of tumor necrosis factor (TNF) in resistance to Listeria monocytogenes infection is well established, the roles of the related cytokines lymphotoxin alpha (LT
) and lymphotoxin beta (LTß) are unknown. Using C57BL/6 mice in which the genes for these cytokines were disrupted, we examined the contributions of TNF, LT
, and LTß in the host response to Listeria. To overcome the lack of peripheral lymph nodes in LT
/ and LTß/ mice, bone marrow chimeras were constructed. TNF/ and LT
/ chimeras that lacked both secreted LT
3 and membrane-bound LT
1ß2 and LT
2ß1 were highly susceptible and succumbed 4.5 and 6 days, respectively, after a low-dose infection (200 CFU). LTß/ chimeras, which lacked only membrane-bound LT, controlled the infection in a manner comparable to wild-type (WT) chimeras. The Listeria-specific proliferative and gamma interferon T-cell responses were equivalent in all five groups of infected mice (LT
/ and LTß/ chimeras, WT chimeras, and TNF/ and WT mice). TNF/ mice and LT
/ chimeras, however, failed to generate the discrete foci of lymphocytes and macrophages that are essential for bacterial elimination. Rather, aberrant necrotic lesions comprised predominantly of neutrophils with relatively few lymphocytes and macrophages were observed in the livers and spleens of TNF/ and LT
/ chimeras. Therefore, in addition to TNF, soluble LT
3 plays a separate essential role in control of listerial infection through control of leukocyte accumulation and organization in infected organs.
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