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Brief Definitive Report |
Binducing Kinase and Inhibitor of
B (I
B) Kinase
in NF-
B Activation through Lymphotoxin ß Receptor, but Not through Tumor Necrosis Factor Receptor I
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)-
Binducing kinase (NIK) and inhibitor of
B (I
B) kinase (IKK) have been implicated as essential components for NF-
B activation in response to many external stimuli. However, the exact roles of NIK and IKK
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
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
B
in embryonic fibroblasts from either wild-type or NIK-mutant mice. In contrast, LTßR stimulation induced NF-
B activation in wild-type mice, but the response was impaired in embryonic fibroblasts from NIK-mutant and IKK
-deficient mice. Consistent with the essential role of IKK
in LTßR signaling, we found that development of Peyer's patches was defective in IKK
-deficient mice. These results demonstrate that both NIK and IKK
are essential for the induction of NF-
B through LTßR, whereas the NIKIKK
pathway is dispensable in TNFR-I signaling.
Key Words:
alymphoplasia, cytokine signaling, I
B, Akt kinase, Peyer's patch
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