期刊
JOURNAL OF EXPERIMENTAL MEDICINE
卷 203, 期 11, 页码 2413-2418出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20061166
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资金
- NCI NIH HHS [R01 CA087924, R01 CA87924] Funding Source: Medline
- NIAID NIH HHS [T32 AI007126, AI07126-30, R01 AI056154] Funding Source: Medline
- NIGMS NIH HHS [R01 GM057559, GM 08042, T32 GM008042, R01 GM57559] Funding Source: Medline
Proper activation of nuclear factor (NF)-kappa B transcription factors is critical in regulating fundamental biological processes such as cell survival and proliferation, as well as in inflammatory and immune responses. Recently, the NF-kappa B signaling pathways have been categorized into the canonical pathway, which results in the nuclear translocation of NF-kappa B complexes containing p50, and the noncanonical pathway, which involves the induced processing of p100 to p52 and the formation of NF-kappa B complexes containing p52 (Bonizzi, G., and M. Karin. 2004. Trends Immunol. 25:280-288). We demonstrate that loss of tumor necrosis factor (TNF) receptor-associated factor 3 (TRAF3) results in constitutive noncanonical NF-kappa B activity. Importantly, TRAF3(-/-) B cells show ligand-independent up-regulation of intracellular adhesion molecule 1 and protection from spontaneous apoptosis during in vitro culture. In addition, we demonstrate that loss of TRAF3 results in profound accumulation of NF-kappa B-inducing kinase in TRAF3(-/-) cells. Finally, we show that the early postnatal lethality observed in TRAF3-deficient mice is rescued by compound loss of the noncanonical NF-kappa B p100 gene. Thus, these genetic data clearly demonstrate that TRAF3 is a critical negative modulator of the noncanonical NF-kappa B pathway and that constitutive activation of the noncanonical NF-kappa B pathway causes the lethal phenotype of TRAF3-deficient mice.
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