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压力颗粒形成的抑制是突变p53所造成的脆弱性
Elizabeth Thoenen1, Atul Ranjan1, Alejandro Parrales1
1Department of Pediatrics, Division of Hematology & Oncology, Children's Mercy Research Institute, Kansas City, MO, USA.
Nature communications
|March 11, 2025
概括
肝细胞癌 (HCC) 中的突变p53 (mutp53) 通过抑制压力颗粒的形成,增强对索拉费尼布的敏感性. 这表明mutp53是ER诱导压力治疗的生物标志物.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在TP53 (p53) 基因中错误的突变通常与恶性进展有关.
- 与其他癌症相反,患有突变p53 (mutp53) 的肝细胞癌 (HCC) 患者的生存率比p53-null HCC患者要好.
研究的目的:
- 为了调查mutp53赋予HCC中对索拉芬尼 (SOR) 的敏感性增加的假设.
- 阐明mutp53通过哪些分子机制影响细胞对内质网膜 (ER) 应激和SOR治疗的反应.
主要方法:
- 在HCC患者数据的内分析.
- 在体外实验涉及细胞系和异种移植的实验.
- 压力颗粒 (SG) 形成和蛋白质与蛋白质相互作用的评估.
主要成果:
- 突变p53通过与PERK和G3BP1.1相互作用来抑制应力颗粒 (SG) 的形成.
- 这种抑制增加了SG-有能力的细胞和异种移植对ER压力诱导物的敏感性,包括sorafenib.
- 与p53-null对应物相比,mutp53肝细胞癌患者的整体存活率有所改善.
结论:
- 突变p53通过抑制压力颗粒的形成,在肝细胞癌中产生独特的脆弱性.
- 突变p53可能作为一个预测生物标志物对ER应激剂的反应,如索拉芬尼布.
- 抑制压力颗粒形成是癌症治疗的潜在治疗策略.
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