IAP对抗剂向cIAP1以诱导TNFalpha依赖的亡
James E Vince1, W Wei-Lynn Wong, Nufail Khan
1Department of Biochemistry, La Trobe University, Kingsbury Drive, Melbourne, VIC 3086, Australia.
Cell
|November 21, 2007
概括
IAP抗剂通过激活NF-kappaB信号和TNFalpha生产来诱导瘤细胞死亡,而不仅仅是通过抑制XIAP. 阻止这种途径允许瘤细胞生存,这表明了新的癌症治疗策略.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 免疫学 免疫学 免疫学
背景情况:
- 亡蛋白X相关抑制剂 (XIAP) 是亡的一个关键调节剂.
- IAP对抗剂 (IAC) 旨在抑制XIAP并诱导瘤细胞死亡.
- 之前的理解表明,IACs主要准线粒体后隙.
研究的目的:
- 为了研究IAP抗剂诱导的亡机制.
- 确定酶8和NF-kappaB信号在IAC介导的细胞死亡中的作用.
- 探索IAC在癌症治疗中的新型治疗应用.
主要方法:
- 用IAP抗体和卡斯帕酶8抑制剂治疗瘤细胞.
- 对NF-kappaB信号激活和TNFalpha生成的分析.
- 评估细胞对诱导亡的敏感性.
主要成果:
- 与预期相反,IAP抗剂诱导了由caspase 8抑制剂阻断的亡.
- IACs通过cIAP1抑制激活NF-kappaB信号传递.
- 通过NF-kappaB刺激的TNFalpha产生会调解自身隐性瘤细胞的杀死.
- 抑制NF-kappaB或TNFalpha可以从IAC诱导的亡中拯救瘤细胞.
- IAC治疗或cIAP1删除使细胞对外源性TNFalpha诱导的亡敏感.
结论:
- IAP抗体通过一种涉及NF-kappaB和TNFalpha的机制诱导细胞死亡,而不仅仅是XIAP抑制.
- 准NF-kappaB信号传递或TNFalpha是一个潜在的战略,以克服对IACs的抗性.
- 在与基于TNFalpha的癌症治疗疗法结合使用时,IAC可能具有新的治疗应用.
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