Redox Biol:RITA和3-MA联合应用可克服头颈癌化学耐药性!

2017-06-28 Emma MedSci原创

该研究揭示了一种与自噬持续诱导,p62过表达和Keap1-Nrf2抗氧化系统活化相关的RITA抗性机制。RITA与3-甲基腺嘌呤的联合治疗,能够通过体外和体内对自噬和抗氧化系统的双重抑制来克服RITA抗药性。这为头颈癌的治疗又提供了一个重要参考和新的希望!

RITA(Reactivation of p53 and induction of tumor cell apoptosis,即p53重激活与诱导肿瘤细胞凋亡)是一种阻断p53和MDM2相互作用的小分子,激活肿瘤细胞中重要的抗癌基因p53,诱导癌细胞凋亡。但是癌细胞表现出的对RITA的抗性是一个需要解决的大问题。研究人员通过研究发现了RITA治疗的抗药性机制,以及一种有效的联合治疗来克服HNC(头颈癌)细胞的RITA抗性。

研究人员在不同HNC细胞系中检测了RITA和3-MA(3-甲基腺嘌呤,一种自噬抑制剂)的作用,包括顺铂抗性和获得性RITA-抗性。通过检测细胞活力,细胞凋亡,细胞周期,谷胱甘肽,活性氧,蛋白质表达,p62和Nrf2基因抑制作用,以及顺铂耐药HNC的小鼠异种移植模型,评价每种药物单独和联合使用的效果。

结果显示,不同水平下的RITA诱导HNC细胞的凋亡,且不显著抑制正常细胞的活力。在RITA治疗后,RITA抗性HNC细胞表现出其他自噬相关蛋白的持续表达,p62过表达,Keap1-Nrf2抗氧化途径的活化。通过与自噬和抗氧化系统相关的分子的双重抑制,自噬抑制剂3-MA使抗性HNC细胞对RITA治疗敏感,且p62基因的沉默增强了组合效应。RITA加3-MA的有效抗肿瘤活性,也在移植有耐药HNC细胞的小鼠模型体内得到证实,HNC细胞显示出氧化应激增加和DNA损伤。结果表明,RITA plus 3-MA可以协助克服HNC细胞的RITA抗性。

该研究揭示了一种与自噬持续诱导,p62过表达和Keap1-Nrf2抗氧化系统活化相关的RITA抗性机制。RITA与3-甲基腺嘌呤的联合治疗,能够通过体外和体内对自噬和抗氧化系统的双重抑制来克服RITA抗药性。这为头颈癌的治疗又提供了一个重要参考和新的希望!

原始出处:
doi: 10.1016/j.redox.2017.05.025.

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    2018-03-02 sunylz
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