一个转录基因,蛋白质基因和功能遗传图谱剖析了外围神经系统中神经纤维素的功能
Harish N Vasudevan1,2, Nadia Arang3,4, Maria Sacconi Nunez1,2
1Department of Radiation Oncology, University of California San Francisco, San Francisco, CA 94143.
概括
周围神经瘤中NF1瘤抑制基因的丧失会损害塞卢美替尼布的反应. 针对KRAS,而不是MEK,通过阻断关键信号通路来治疗NF1突变瘤有希望.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症遗传学 癌症遗传学
背景情况:
- NF1瘤抑制基因 (神经纤维素) 调节Ras信号传输,其突变导致神经纤维素炎1型 (NF-1) 和相关癌症.
- 由于NF1损失导致Ras-MEK-ERK通路的激活驱动瘤生长,导致MEK抑制剂 (塞卢梅提尼布) 对NF-1相关的外周神经系统 (PNS) 瘤的批准.
- 对于NF1损失对塞卢美替尼布敏感性和替代治疗点的影响仍然不完全理解.
研究的目的:
- 系统地剖析神经纤维素损失在外围神经细胞中的功能后果.
- 研究针对NF1突变瘤中Ras途径上游或下游组件的有效性.
- 确定NF1突变PNS瘤的新型治疗策略.
主要方法:
- 克里斯普尔干扰 (克里斯普尔i) 用于在不朽化的外围神经 (iPN) 细胞中抑制基因.
- 用RNA测序和蛋白质组分析来评估基因表达和信号通路活性.
- 药理学抑制和近位蛋白质组学,以评估药物疗效和蛋白质相互作用.
主要成果:
- 在iPN细胞中NF1抑制增加了Ras活性,促进了增殖,并且由于反调节,降低了对塞卢美替尼的敏感性.
- 抑制PTPN11具有相反的效果,减少扩散并增加塞卢美替尼的敏感性.
- SOS2补偿了SOS1的上游抑制,限制了它的有效性.
- 蛋白质学确定了KRAS,但不是HRAS或NRAS,作为与神经纤维素相互作用的Ras异型.
结论:
- 通过改变的反机制,NF1损失赋予了对MEK抑制的抵抗力.
- 针对KRAS而不是MEK或SOS1,有效地抑制NF1突变细胞中的ERK和CDK1/2激活.
- 抑制KRAS代表了NF1突变PNS瘤的潜在治疗策略.
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