增加的ErbB2信号传递是对抗雄激素信号传递抑制的早期适应,并且在抵抗割的前列腺癌中持续存在
Jude Owiredu1, Betul Ersoy-Fazlioglu2, Larysa Poluben2
1Weill Cornell Medicine, New York, MA, United States.
概括
由NRG1和d16ERBB2驱动的ErbB2信号的增加,是对抗雄激素信号抑制的快速适应,并促进抵抗割的前列腺癌. ErbB2 抑制剂可能会改善治疗结果.
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:
- 在一些前列腺癌 (PCa) 中,ErbB2 (人类表皮生长因子受体2) 活性升高.
- 驱动这种增加ErbB2活性的机制及其在前列腺癌进展到割抵抗性前列腺癌 (CRPC) 中的作用尚未完全理解.
研究的目的:
- 确定导致前列腺癌中ErbB2活性增加的机制.
- 调查这些机制在进展为抵抗割的前列腺癌中的作用.
主要方法:
- 使用免疫组织化学 (IHC),反相蛋白阵列和RNA测序.
- 在细胞系,异种移植和临床瘤中,在割抵抗的各个阶段询问了ErbB2信号.
- 在体外和体内对ErbB2抑制剂 (内拉替尼) 的评估敏感性.
主要成果:
- 在约26%的瘤中观察到ErbB2激活后雄激素信号抑制 (ASI) 和高级CRPC.
- 在接受新辅助性ASI治疗的瘤中,NRG1连接体被发现在约75%的瘤中,在ASI时NRG1mRNA迅速增加.
- 一个活跃的ERBB2拼接变体 (d16ERBB2) 也被ASI快速升级,并在CRPC的一个子集中检测到.
- ErbB2信号仍然对内拉替尼敏感,这增强了割反应,并抑制了耐割的异种移植生长.
结论:
- 增加ErbB2信号传递是对ASI的早期适应,有助于前列腺癌中割抵抗.
- NRG1和d16ERBB2的上调是驱动ErbB2信号增加的关键机制.
- ErbB2对抗剂可能会增强对割敏感PCa的ASI疗效,酸化的ErbB2可以作为CRPC治疗反应的预测生物标志物.
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