IKKβ-I-κBɛ-c-Rel/p50: a new axis of NF-κB activation in lung epithelial cells.

IKKβ-I-κBɛ-c-Rel/p50: a new axis of NF-κB activation in lung epithelial cells.
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IKKβ-I-κBɛ-C-REL/P50:肺上皮细胞中NF-κB激活的新轴。

DOI:
10.1038/oncsis.2012.8
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发表时间:
2012-04-09
期刊:
影响因子:
6.2
通讯作者:
Sil, A. K.
Sil, A. K.
中科院分区:
医学1区
文献类型:
--
作者:
Maity, P. C.;Ray, T.;Das, B.;Sil, A. K.

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香烟烟雾 (CS) 是罹患肺癌的主要危险因素,已知它会激活转录激活因子核因子 kappa B (NF-κB)。然而,由于相互矛盾的报道,这种激活的潜在机制仍不清楚。由于 NF-κB 在恶性肿瘤的产生和维持中发挥着关键作用,因此人们致力于通过离体和体内研究来了解其激活机制。结果表明,CS诱导的NF-κB激活机制不同于脂多糖(LPS)等其他促炎信号。 CS 刺激后易位至细胞核的 NF-κB 二聚体主要由 c-Rel/p50 组成,这种易位涉及 I-κBɛ 而不是 I-κBα 的降解。 I-κBɛ 的这种降解取决于 IKKβ 活性,IKKβ 活性优先针对 I-κBɛ。一致地,CS 激活的 IKKβ 被发现与参与 LPS 激活的形式不同,因为 IKKβ 的 Ser177 和 Ser181 对于 CS 诱导的 NF-κB 激活都不是至关重要的。因此,与 p65 和 I-κBα 起核心作用的其他促炎刺激不同,CS 诱导的肺上皮细胞 NF-κB 激活中主要活跃的信号级联由 IKKβ–I-κBɛ–c-Rel/p50 组成。因此,本研究揭示了 NF-κB 激活的新轴,其中 I-κBɛ 和 c-Rel 发挥核心作用。
Cigarette smoke (CS), a major risk factor for developing lung cancer, is known to activate transcriptional activator nuclear factor kappa B (NF-κB). However, the underlying mechanism of this activation remains unclear because of conflicting reports. As NF-κB has a pivotal role in the generation and maintenance of malignancies, efforts were targeted towards understanding its activation mechanism using both ex vivo and in vivo studies. The results show that CS-induced NF-κB activation mechanism is different from that of other pro-inflammatory signals such as lipopolysaccharide (LPS). The NF-κB dimer that translocates to the nucleus upon stimulation with CS is predominantly composed of c-Rel/p50 and this translocation involves degradation of I-κBɛ and not I-κBα. This degradation of I-κBɛ depends on IKKβ activity, which preferentially targets I-κBɛ. Consistently, CS-activated form of IKKβ was found to be different from that involved in LPS activation as neither Ser177 nor Ser181 of IKKβ is crucial for CS-induced NF-κB activation. Thus, unlike other pro-inflammatory stimulations where p65 and I-κBα have a central role, the predominantly active signaling cascade in CS-induced NF-κB activation in the lung epithelial cells comprises of IKKβ–I-κBɛ–c-Rel/p50. Thus, this study uncovers a new axis of NF-κB activation wherein I-κBɛ and c-Rel have the central role.
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