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Cell Death & Disease:c-FLIP和CD95对肾细胞癌的生存是必需的

2019-05-26 AlexYang MedSci原创

透明细胞肾细胞癌(ccRCC)是肾脏癌症中最突出的肿瘤。肾细胞癌(RCC)岁肿瘤治疗的抗性可以归结于抗凋亡蛋白的过表达而引起的细胞凋亡的抗性等。然而,在ccRCC中,关于细胞凋亡抑制因子c-FLIP的作用和它对死亡受体诱导的细胞凋亡的影响所知甚少。最近,有研究人员阐释了c-FLIP在4个ccRCC细胞系中对CD95L诱导的细胞凋亡抗性的产生非常关键。明显的是,shRNA对c-FLIP表达的下调作用

透明细胞肾细胞癌(ccRCC)是肾脏癌症中最突出的肿瘤。肾细胞癌(RCC)岁肿瘤治疗的抗性可以归结于抗凋亡蛋白的过表达而引起的细胞凋亡的抗性等。然而,在ccRCC中,关于细胞凋亡抑制因子c-FLIP的作用和它对死亡受体诱导的细胞凋亡的影响所知甚少。

最近,有研究人员阐释了c-FLIP在4个ccRCC细胞系中对CD95L诱导的细胞凋亡抗性的产生非常关键。明显的是,shRNA对c-FLIP表达的下调作用能够导致自发的凋亡蛋白的激活和细胞凋亡引起的细胞死亡。另外,所有c-FLIP剪接体的敲除对诱导细胞凋亡是需要的。CD95L刺激ccRCCx细胞能够诱导NF-κB和MAP激酶生存途径,具体是通过RelA/p65和Erk1/2的磷酸化。有趣的是,CD95L表面表达在所有分析的细胞系中较高,并且CD95而不是TNF-R1,在细胞接触未知积累。CD95下调和NF-κB途径的抑制能够导致自发性的细胞死亡。令人惊讶的是,敲除试验阐释了c-FLIP在CD95信号中能够抑制NF-κB激活。因此,c-FLIP能够抑制细胞凋亡和CD95的下游因子NF-κB,但是允许NF-κB激活到一个满足ccRCC细胞生存的水平。

最后,研究人员指出,他们阐释了一个复杂的CD95-FLIP-NF-κB信号回路,其中CD95-CD95L互作能够调节ccRCC细胞中的旁分泌信号途径,且c-FLIP和NF-κB对抑制细胞死亡和确保存活是必需的。他们的研究可能为绕过细胞凋亡抗性而开发新的RCC治疗方法提供依据。

原始出处:

Tobias Luebke, Lisa Schwarz, Yan Yan Beer et al. c-FLIP and CD95 signaling are essential for survival of renal cell carcinoma. Cell Death & Disease. 16 May 2019

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    2019-06-01 维他命
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    2019-09-16 habb
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    2019-05-28 cy0328

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