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Effects of Cot expression on the nuclear translocation of NF-kappaB in RBL-2H3 cells.

Mol. Immunol.2007 Mar;44(7):1490-7. Epub 2006 Oct 17
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摘要


Cot is a serine/threonine protein kinase and is classified as a mitogen-activated protein (MAP) kinase kinase kinase. Overexpression of this protein has been shown to activate the extracellular signal-regulated kinase, the c-Jun N-terminal kinase, and the p38 MAP kinase pathways and to stimulate NF-AT and NF-kappaB-dependent transcription. Here we have shown that Cot kinase activity is intimately involved in the high affinity receptor for IgE (FcvarepsilonRI)-mediated nuclear translocation of NF-kappaB1 independent of NF-kappaB-inducing kinase (NIK) in rat basophilic leukemia (RBL-2H3) cells. A transfected green fluorescent protein-tagged NF-kappaB1 (GFP-NF-kappaB1) resided in the cytoplasm in RBL-2H3 cells and it remained in the cytoplasm even when Cot tagged with red fluorescent protein (Cot-RFP) was co-expressed. Western blotting analysis showed that IkappaB kinases (IKKs) were expressed in RBL-2H3 cells but NIK was not. GFP-NF-kappaB1 translocated from the cytoplasm to the nucleus after the aggregation of FcvarepsilonRI in Cot-transfected cells but not in kinase-deficient Cot-transfected cells. This finding gives a new insight into the role of Cot in the FcvarepsilonRI-mediated NF-kappaB activation in mast cells.

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