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Caspase-8- and JNK-dependent AP-1 activation is required for Fas ligand-induced IL-8 production
- フォーマット:
- 論文
- 責任表示:
- Matsumoto, Norihiko ; Imamura, Ryu ; Suda, Takashi
- 言語:
- 英語
- 出版情報:
- Blackwell Publishing, 2007-03-01
- 著者名:
- 掲載情報:
- FEBS Journal
- ISSN:
- 1742-464x
- 巻:
- 279
- 通号:
- 9
- 開始ページ:
- 2376
- 終了ページ:
- 2384
- バージョン:
- author
- 概要:
- Despite a dogma that apoptosis does not induce inflammation, Fas ligand (FasL), a well-known death factor, possesses pro-inflammatory activity. For example, FasL induces nuclear factor κB (NF-κB) activity and interleukin 8 (IL-8) production by engagement of Fas in human cells. Here, we found that a dominant negative mutant of c-Jun, a component of the activator protein-1 (AP-1) transcription factor, inhibits FasL-induced AP-1 activity and IL-8 production in … HEK293 cells. Selective inhibition of AP-1 did not affect NF-κB activation and vice versa, indicating that their activations were not sequential events. The FasL-induced AP-1 activation could be inhibited by deleting or introducing the lymphoproliferation (lpr)-type point mutation into the Fas death domain (DD), knocking down the Fas-associated DD protein (FADD), abrogating caspase-8 expression with small interfering RNAs, or using inhibitors for pan-caspase and caspase-8 but not caspase-1 or caspase-3. Furthermore, wildtype, but not a catalytically inactive mutant, of caspase-8 reconstituted the FasL-induced AP-1 activation in caspase-8-deficient cells. Fas ligand induced the phosphorylation of two of the three major mitogen-activated protein kinases (MAPKs): extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) but not p38 MAPK. Unexpectedly, an inhibitor for JNK but not for MAPK/ERK kinase inhibited the FasL-induced AP-1 activation and IL-8 production. These results demonstrate that FasL-induced AP-1 activation is required for optimal IL-8 production, and this process is mediated by FADD, caspase-8, and JNK. © 2007 The Authors. 続きを見る
- URL:
- http://hdl.handle.net/2297/6760
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