Phosphorylation of SNAP-23 by IkappaB kinase 2 regulates mast cell degranulation.

Phosphorylation of SNAP-23 by IkappaB kinase 2 regulates mast cell degranulation.
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DOI:
10.1016/j.cell.2008.05.050
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发表时间:
2008-08-08
期刊:
影响因子:
64.5
通讯作者:
Verma IM
Verma IM
中科院分区:
生物学1区
文献类型:
--
作者:
Suzuki K;Verma IM

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Mast cells are known to play a pivotal role in allergic diseases. Cross-linking of the high-affinity receptor for IgE (FcεRI) leads to degranulation and allergic inflammation; however, the regulatory mechanisms of IgE-dependent exocytosis remain unknown. We show here that IκB kinase (IKK) 2 in mast cells plays critical roles in IgE-mediated anaphylaxis in vivo, and IgE-mediated degranulation in vitro, in an NF-kB-independent manner. Upon FcεRI stimulation, IKK2 phosphorylates SNAP-23, the target membrane soluble N-ethylmaleimide-sensitive fusion factor attachment protein receptor (SNARE), and ectopic expression of a phosphomimetic mutant of SNAP-23 partially rescued the impaired IgE-mediated degranulation in IKK2-deficient mast cells. These results suggest that IKK2 phosphorylation of SNAP-23 leads to degranulation and anaphylactic reactions. While this reaction is NF-kB-independent, we additionally show that IKK2 also regulates late-phase allergic reactions promoted by the release of proinflammatory cytokines in an NF-kB-dependent manner. The findings suggest that IKK2 is a central player in allergic reactions.
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