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作为一种耐化学反应的蛋白质,DKK1调节了结直肠癌中氧化的反应

Chi-Che Hsieh^1,2, Ting-Wei Li^1,3, Chun-Chun Li³

¹National Institute of Cancer Research, National Health Research Institutes, Tainan, 704, Taiwan.

|September 27, 2024

概括

迪克科普-1 (DKK1) 蛋白通过激活AKT信号来驱动结肠直肠癌 (CRC) 中对氧沙化疗的耐药性. 破坏这种与氨酸拉链 (LZ) 蛋白质的相互作用,可以恢复抗性CRC中的氧化敏感性.

科学领域:

在瘤学瘤学.
分子生物学分子生物学
癌症研究癌症研究

背景情况:

奥克萨利普拉丁是结直肠癌 (CRC) 的关键化疗.
对氧沙的获得性耐药性显著限制了其在CRC患者的治疗疗效.
在CRC中抗氧化抗性背后的机制需要进一步阐明.

研究的目的:

调查Dickkopf-1 (DKK1) 在结肠直肠癌 (CRC) 中介氧沙抗性的作用.
为了确定负责DKK1介导的化学抵抗的分子相互作用.
探索针对DKK1信号的治疗策略,以克服氧沙抗性.

主要方法:

在抗氧化 (OR) 的CRC细胞系和患者瘤中分析DKK1表达.
研究DKK1及其受体细胞骨相关蛋白4 (CKAP4) 之间的相互作用.
使用氨酸拉链 (LZ) 蛋白质来破坏DKK1-CKAP4相互作用,并评估对体外和体内活体模型中氧化敏感性的影响.

主要成果:

在OR或CRC细胞系和瘤中观察到升级的DKK1 (抗药性瘤的~50%的增加>2倍).
DKK1 通过 CKAP4 激活 AKT 信号,调节氧化的反应.
在这种相互作用中,CKAP4的leucine拉链 (LZ) 域和DKK1的CRD1对这种相互作用至关重要.
使用LZ蛋白质破坏DKK1信号传递,在ORCRC细胞和异种移植中增强了oxaliplatin的敏感性.

结论:

DKK1通过激活AKT信号来作为CRC中的化学抵抗因子.
针对DKK1-CKAP4与LZ蛋白的相互作用,为抗氧化抗性CRC提供了潜在的治疗策略.
这项研究阐明了抗氧化抗性的新机制,并提供了一种创新的干预方法.

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