首页> 外文期刊>American Journal of Physiology >Differential requirement for NF-kappaB-inducing kinase in the induction of NF-kappaB by IL-1beta, TNF-alpha, and Fas.
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Differential requirement for NF-kappaB-inducing kinase in the induction of NF-kappaB by IL-1beta, TNF-alpha, and Fas.

机译:IL-1beta,TNF-α和Fas诱导NF-κB诱导NF-κB诱导激酶的差异需求。

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摘要

In this study, we examined the role of the nuclear factor-kappaB (NF-kappaB)-inducing kinase (NIK) in distinct signaling pathways leading to NF-kappaB activation. We show that a dominant-negative form of NIK (dnNIK) delivered by adenoviral (Ad5dnNIK) vector inhibits Fas-induced IkappaBalpha phosphorylation and NF-kappaB-dependent gene expression in HT-29 and HeLa cells. Interleukin (IL)-1beta- and tumor necrosis factor-alpha (TNF-alpha)-induced NF-kappaB activation and kappaB-dependent gene expression are inhibited in HeLa cells but not in Ad5dnNIK-infected HT-29 cells. Moreover, Ad5dnNIK failed to sensitize HT-29 cells to TNF-alpha-induced apoptosis at an early time point. However, cytokine- and Fas-induced signals to NF-kappaB are finally integrated by the IkappaB kinase (IKK) complex, since IkappaBalpha phosphorylation, NF-kappaB DNA binding activity, and IL-8 gene expression were strongly inhibited in HT-29 and HeLa cells overexpressing dominant-negative IKKbeta (Ad5dnIKKbeta). Our findings supportthe concept that cytokine signaling to NF-kappaB is redundant at the level of NIK. In addition, this study demonstrates for the first time the critical role of NIK and IKKbeta in Fas-induced NF-kappaB signaling cascade.
机译:在这项研究中,我们检查了核因子-kappaB(NF-kappaB)诱导激酶(NIK)在导致NF-kappaB活化的不同信号通路中的作用。我们显示,腺病毒(Ad5dnNIK)载体传递的NIK(dnNIK)的显性负型抑制HT-29和HeLa细胞中Fas诱导的IkappaBalpha磷酸化和NF-kappaB依赖性基因表达。在HeLa细胞中抑制了白介素(IL)-1β和肿瘤坏死因子-α(TNF-α)诱导的NF-kappaB激活和kappaB依赖的基因表达,但在感染Ad5dnNIK的HT-29细胞中却没有。此外,Ad5dnNIK在早期无法使HT-29细胞对TNF-α诱导的细胞凋亡敏感。但是,由于IK-Bα磷酸化,NF-κBDNA结合活性和IL-8基因表达在HT-29和HT-29中受到强烈抑制,因此细胞因子和Fas诱导的NF-κB信号最终被IkappaB激酶(IKK)复合体整合。 HeLa细胞过表达显性负IKKbeta(Ad5dnIKKbeta)。我们的发现支持了以下概念:在NIK水平上,向NF-κB的细胞因子信号传导是多余的。此外,这项研究首次证明了NIK和IKKbeta在Fas诱导的NF-κB信号级联反应中的关键作用。

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