低细胞外pH值通过降低Mcl-1表达的调节来增强TRAIL诱导的亡
Farzaneh Vafaeinik1, Lin Zhang2, Yong J Lee1
1Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA.
低的细胞外pH值显著增强与瘤亡因子相关的结直肠癌细胞中的亡诱导配体 (TRAIL) 细胞毒性. 这种效应是由Mcl-1下调和JNK激活的介导,这对于TRAIL诱导的亡至关重要.
科学领域:
- 在瘤学瘤学.
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 以前的研究表明,低细胞外pH值通过线粒体介导的酶通路增强了TRAIL诱导的亡.
- 了解精确的机制对于开发有针对性的癌症疗法至关重要.
研究的目的:
- 阐明低细胞外pH值增强人类结直肠癌细胞中TRAIL诱导的亡的分子机制.
- 调查抗亡蛋白质,特别是Mcl-1和JNK信号在这个过程中的作用.
主要方法:
- 在不同pH值 (如pH6.3,6.6,7.2) 处用TRAIL对HCT116和BxPC-3细胞进行处理.
- 对细胞毒性,蛋白质水平 (Mcl-1) 和蛋白质酸化 (JNK) 的分析.
- 利用Mcl-1化部位突变敲进 (KI) HCT116细胞来评估Mcl-1的作用.
主要成果:
- 低细胞外pH值 (6.3和6.6) 与pH值7.2相比,在HCT116和BxPC-3细胞中显著增强了TRAIL诱导的细胞毒性.
- 治疗TRAIL导致了抗亡蛋白Mcl-1的下调.
- 对于TRAIL诱导的亡来说,Mcl-1的下调是必不可少的,因为阻断它 (Mcl-1 KI细胞) 赋予了TRAIL的抗性.
- TRAIL诱导了JNK酸化,这表明JNK通路参与了Trail介导的细胞死亡.
结论:
- 低细胞外pH值,特别是酸性水平,增强了TRAIL对结直肠和胰腺癌细胞的细胞毒性作用.
- Mcl-1 是 TRAIL 的一个关键目标,其下调对于这些癌细胞中 TRAIL 诱导的亡至关重要.
- 在酸性条件下,JNK信号通路的激活与 TRAIL 诱导的细胞死亡有关.
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