Oncogene:雄激素受体调控的脂质合成再激活可促使去势难治性前列腺癌的恶化

2017-11-04 AlexYang MedSci原创

雄激素受体(AR)是一种转录激活因子,并且在前列腺癌细胞中可以刺激基因的表达来满足各种细胞功能的需求,包括了代谢和增殖过程。AR信号通路同样对激素依赖的前列腺癌(PCa)的发展是必需的,并且它的活性可以由雄激素阻断疗法(ADTs)来封闭。尽管PCa病人在治疗刚开始对ADTs具有很好的治疗反应,但是癌症不可避免地复发并且恶化到致死性去势难治性前列腺癌(CRPC)。虽然雄激素水平被抑制,AR在CRPC

雄激素受体(AR)是一种转录激活因子,并且在前列腺癌细胞中可以刺激基因的表达来满足各种细胞功能的需求,包括了代谢和增殖过程。AR信号通路同样对激素依赖的前列腺癌(PCa)的发展是必需的,并且它的活性可以由雄激素阻断疗法(ADTs)来封闭。尽管PCa病人在治疗刚开始对ADTs具有很好的治疗反应,但是癌症不可避免地复发并且恶化到致死性去势难治性前列腺癌(CRPC)。虽然雄激素水平被抑制,AR在CRPC中仍具有活性,并且是否AR信号被重组仍旧不清楚。

最近,有研究人员在1个来源于CRPC模型的PCa细胞系中,来利用全面的生物信息学分析检测了AR顺反组情况。显著的是,研究人员发现AR顺返组在CRPC中大部分被保留。特别的是,AR调控的脂质合成高度保守并且在恶化到CRPC过程中再次激活,并且脂质合成水平的增加与不良的预后有关。另外,脂质合成途径的保留部分的是由于AR剪接变异体表达的增加。在AR变异体表达的CRPC细胞系和异种种植模型中阻断脂质/胆固醇合成可以通过对mTOR信号通路的抑制显著的减少肿瘤的生长。脂肪酸延长酶ELOVL7表达的沉默同样可以导致CRPC异种种植肿瘤的退化。最后,研究人员指出,这些结果表明了AR调控脂质生物合成途径的再激活在促使CRPC恶化中的重要性,并且还指出ADTs也许可通过阻断脂质生物合成来改善治疗效果。

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    2018-02-05 xlysu
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    2018-03-13 cy0324
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    2017-11-06 freve
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