The Journal of Experimental Medicine
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Published online 5 March 2001.
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© The Rockefeller University Press, 0022-1007/2001/3/631/ $5.00
The Journal of Experimental Medicine, Volume 193, Number 5, March 5, 2001 631-636


Brief Definitive Report

Essential Role of Nuclear Factor (NF)-{kappa}B–inducing Kinase and Inhibitor of {kappa}B (I{kappa}B) Kinase {alpha} in NF-{kappa}B Activation through Lymphotoxin ß Receptor, but Not through Tumor Necrosis Factor Receptor I

Akemi Matsushimaa, Tsuneyasu Kaishob, Paul D. Rennertc, Hiroyasu Nakanod, Kyoko Kurosawad, Daisuke Uchidaa, Kiyoshi Takedab, Shizuo Akirab, and Mitsuru Matsumotoa
a Division of Informative Cytology, Institute for Enzyme Research, University of Tokushima, Tokushima 770-8503, Japan
b Department of Host Defense, Research Institute for Microbial Diseases, and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation, Osaka University, Osaka 565-0871, Japan
c Department of Immunology and Inflammation, Biogen, Incorporated, Cambridge, Massachusetts 02142
d Department of Immunology and CREST, Japan Science and Technology Corporation, Juntendo University School of Medicine, Tokyo 113-8421, Japan

Correspondence to: Mitsuru Matsumoto, Division of Informative Cytology, Institute for Enzyme Research, University of Tokushima, 3-18-15 Kuramoto, Tokushima 770-8503, Japan. Tel:81-88-633-7432 Fax:81-88-633-7434 E-mail:mitsuru{at}ier.tokushima-u.ac.jp.

Both nuclear factor (NF)-{kappa}B–inducing kinase (NIK) and inhibitor of {kappa}B (I{kappa}B) kinase (IKK) have been implicated as essential components for NF-{kappa}B activation in response to many external stimuli. However, the exact roles of NIK and IKK{alpha} in cytokine signaling still remain controversial. With the use of in vivo mouse models, rather than with enforced gene-expression systems, we have investigated the role of NIK and IKK{alpha} in signaling through the type I tumor necrosis factor (TNF) receptor (TNFR-I) and the lymphotoxin ß receptor (LTßR), a receptor essential for lymphoid organogenesis. TNF stimulation induced similar levels of phosphorylation and degradation of I{kappa}B{alpha} in embryonic fibroblasts from either wild-type or NIK-mutant mice. In contrast, LTßR stimulation induced NF-{kappa}B activation in wild-type mice, but the response was impaired in embryonic fibroblasts from NIK-mutant and IKK{alpha}-deficient mice. Consistent with the essential role of IKK{alpha} in LTßR signaling, we found that development of Peyer's patches was defective in IKK{alpha}-deficient mice. These results demonstrate that both NIK and IKK{alpha} are essential for the induction of NF-{kappa}B through LTßR, whereas the NIK–IKK{alpha} pathway is dispensable in TNFR-I signaling.

Key Words: alymphoplasia, cytokine signaling, I{kappa}B, Akt kinase, Peyer's patch


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