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缺口信号通过抑制PGC-1α和线粒体生物生成来调节代谢开关在非分化的脂质瘤中
Pei-Chieh Tien1, Xiyue Chen1, Bennett D Elzey2,3
1Department of Animal Sciences, Purdue University, West Lafayette, IN, 47907, USA.
在非分化脂肪瘤 (DDLPS) 中的痕信号激活抑制PGC-1α,抑制线粒体功能并促进癌症生长. 恢复PGC-1α可以扭转这些影响,为这种致命的癌症提供潜在的治疗点.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症新陈代谢 癌症新陈代谢
背景情况:
- 分离性脂肪瘤 (DDLPS) 是一种罕见的,致命的癌症,缺乏已识别的驱动突变,阻碍了向治疗的发展.
- 构成性Notch信号激活,通过Notch1细胞内域过度表达 (NICDOE),在小鼠脂肪细胞模型人类DDLPS.
- 在DDLPS中Notch激活的致癌作用的精确机制在很大程度上是未知的.
研究的目的:
- 阐明诺奇信号驱动DDLPS的分子机制.
- 研究Notch激活,细胞代谢和DDLPS的预后之间的联系.
- 根据Notch信号通路识别DDLPS的潜在治疗点.
主要方法:
- 在人类DDLPS患者样本中分析Notch信号激活.
- 使用呼吸计和糖溶解试验对小鼠NICDOE DDLPS细胞进行代谢分析.
- 在DLPS细胞中进行基因操纵以切除NICDOE或过度表达PGC-1α.
- 评估线粒体生物发生,细胞生长和脂肪分化.
主要成果:
- 在人类DDLPS的一个子集中激活了痕信号,与预后差和MDM2表达相关.
- 鼠NICDOE DDLPS细胞表现出 mitochondrial 呼吸的减少和糖分分解的增加 (Warburg 效应).
- 口激活会降低氧酶增殖器激活受体玛联合激活剂1α (PGC-1α) 的表达,这是线粒体生物发生的关键调节者.
- 对NICDOE或PGC-1α过度表达的遗传救援恢复了线粒体功能,抑制了瘤生长,并促进了基分化.
结论:
- 在DDLPS中痕信号激活抑制PGC-1α,导致线粒体生物发生障碍和代谢转向糖解.
- 恢复PGC-1α功能可以逆转DLPS的代谢和增殖表型.
- 针对Notch-PGC-1α轴是DDLPS的一种有前途的治疗策略.
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