Blood:在LGL白血病中,TRAIL介导和维持NF-κB的组成性激活

2018-04-27 MedSci MedSci原创

中心点:在LGL白血病中,TRAIL表达上调,TRAIL-DcR2信号可促进NF-κB组成性激活。蛋白酶体抑制剂(硼替佐米和ixazomib)可有效阻断TRAIL诱导的NF-κB激活,从而诱导细胞凋亡。摘要:大颗粒淋巴细胞(LGL)白血病源于CD3+细胞毒性T淋巴细胞或CD3-自然杀伤(NK)细胞单克隆扩增。慢性抗原刺激可通过构成性激活多条存活信号通路促进LGL淋巴细胞长时间存活,导致整体的细胞凋

中心点:

在LGL白血病中,TRAIL表达上调,TRAIL-DcR2信号可促进NF-κB组成性激活。

蛋白酶体抑制剂(硼替佐米和ixazomib)可有效阻断TRAIL诱导的NF-κB激活,从而诱导细胞凋亡。

摘要:

大颗粒淋巴细胞(LGL)白血病源于CD3+细胞毒性T淋巴细胞或CD3-自然杀伤(NK)细胞单克隆扩增。慢性抗原刺激可通过构成性激活多条存活信号通路促进LGL淋巴细胞长时间存活,导致整体的细胞凋亡异常、耐受激活诱导性细胞死亡。Jun Yang等人既往报道核因子κB(NF-κB)是白血病LGL存活网络的中心调节因子。但NF-κB在是LGL白血病中的触发激活机制尚不明确。

已知TNF相关的凋亡诱导配体(TRAIL)可诱导肿瘤细胞凋亡,同时还可通过与TRAIL受体1/2/4(即DR4、DR5和DcR2)相互作用激活NF-κB。TRAIL在LGL白血病中的作用尚未进行过研究。

Jun Yang等人推测在LGL白血病中,TRAIL与DcR2相互作用从而激活NF-κB。并对此进行验证。经实验发现LGL白血病细胞的TARIL的mRNA和蛋白水平上调,伴随LGL白血病患者血清中的可溶性TRAIL蛋白水平升高。此外,研究人员还发现在LGL白血病细胞中,DcR2是主要的TRAIL受体。而且研究人员还证实在白血病LGL中,TRAIL诱导激活DcR2可进而导致NF-κB激活增强。相反,阻断TRAIL-DcR2信号则可降低NF-κB的激活。最后,抑制NF-κB的蛋白酶体抑制剂(硼替佐米和ixazomib),应用于LGL白血病细胞和原发患者细胞时具有减少增殖、增加凋亡的能力,因而或许可为LGL白血病患者提供新的治疗选择。

原始出处:

Jun Yang, Francis R. LeBlanc,et al.TRAIL mediates and sustains constitutive NF-κB activation in LGL leukemia.Blood  2018  :blood-2017-09-808816;  doi: https://doi.org/10.1182/blood-2017-09-808816

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    2019-02-01 bsmagic9140
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    2018-04-29 yfjms

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