在 HepG2 细胞中,SETDB1 衰退通过 DRP1 酸化介导的线粒体功能障碍促进对索拉尼的耐药性
Mingjian Fan1, Jiahang Wu1, Yunjiao Wu2
1KingMed School of Laboratory Medicine, Guangzhou Medical University, Guangzhou 511436, China.
概括
肝脏SETDB1表达通过预防线粒体功能障碍和过度DRP1酸化,提高了肝细胞癌 (HCC) 中索拉芬尼的疗效. 在HCC患者中,SETDB1可作为索拉芬尼治疗的预测生物标志物.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 索拉费尼布是晚期肝细胞癌 (HCC) 的标准治疗方法.
- 对索拉费尼布的个体耐药性仍然是一个重大的临床挑战.
- 组织素H3K9甲基转移酶SETDB1在索拉芬尼抗性中的作用基本上是未知的.
研究的目的:
- 调查SETDB1在调节HCC中索拉芬尼敏感性的作用.
- 阐明涉及线粒体功能和DRP1酸化的潜在分子机制.
主要方法:
- 在TCGA-LIHC和临床HCC样本中分析SETDB1表达.
- 在SETDB1-沉默的肝瘤细胞中评估索拉芬尼的细胞毒性.
- 在HepG2细胞中评估线粒体功能 (膜潜力,mSOX,mtDNA含量,裂变) 和DRP1酸化 (pDRP1S616).
- 肝脏pDRP1S616水平与患者预后之间的相关性分析.
主要成果:
- 肝脏SETDB1表达与治疗索拉费尼布的HCC患者的更好的预后具有积极的相关性.
- 沉默SETDB1降低了索拉芬尼的细胞毒性作用,并损害了线粒体功能.
- SETDB1的淘汰会增加线粒体超氧化物 (mSOX),减少线粒体DNA (mtDNA) 含量,并促进DRP1的酸化.
- 抑制DRP1酸化 (pDRP1S616A) 提高了索拉芬尼的敏感性,mSOX和mtDNA含量.
- 肝脏pDRP1S616水平升高与索拉芬尼治疗的HCC患者的预后有负相关性.
结论:
- 通过维持线粒体完整性和调节DRP1酸化,SETDB1增强了HCC中索拉芬尼的敏感性.
- 肝脏SETDB1表达是一种潜在的预测生物标志物,用于索拉芬尼治疗HCC.
- 准SETDB1或调节线粒体功能可能为克服索拉芬尼布耐药性的治疗提供新的治疗策略.
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