Hepatology:雄激素受体过度表达与AR-mTOR在肝细胞癌中的意义!

2017-12-12 MedSci MedSci原创

肝细胞癌(HCC)在男性中的发病率较高,这可能由于雄激素受体(AR)与HCC的发病机制有关。然而,AR表达及其在HCC中的确切作用仍然存在争议。此前在HCC中进行的抗雄激素和抗AR的相关临床试验未能显示出其临床益处。近期,一项发表在Hepatology上的研究发现,在大约37%的HCC肿瘤的细胞核中存在AR的过表达,并且,其与晚期疾病阶段和患者的存活不良相关。在HCC细胞中,AR过度表达显着改变A

肝细胞癌(HCC)在男性中的发病率较高,这可能由于雄激素受体(AR)与HCC的发病机制有关。然而,AR表达及其在HCC中的确切作用仍然存在争议。此前在HCC中进行的抗雄激素和抗AR的相关临床试验未能显示出其临床益处。

近期,一项发表在Hepatology上的研究发现,在大约37%的HCC肿瘤的细胞核中存在AR的过表达,并且,其与晚期疾病阶段和患者的存活不良相关。

在HCC细胞中,AR过度表达显着改变AR依赖性转录组,刺激致癌性生长并决定对恩扎鲁胺(enzalutamide,第二代AR拮抗剂)的治疗反应。然而,抑制AR可以引起AKT-mTOR信号的反馈激活,AKT-mTOR信号是细胞生长和存活的中心调节器。另一方面,mTOR通过抑制泛素依赖性AR降解和增强AR核定位来促进核AR的蛋白表达,这就为HCC核中AR过表达提供了相关的解释机制。最后,AR和mTOR的共同靶点显示出显着的协同抗HCC活性,并通过诱导体内细胞凋亡来降低肿瘤负荷。

此项研究结果表明:细胞核内AR的过表达与HCC的进展和预后有关。然而,由于反馈激活AKT-mTOR途径,单独的恩扎鲁胺具有有限的治疗效用。而且,mTOR驱动核AR过度表达。共同靶向针对AR和mTOR是HCC有希望的治疗策略。

原始出处:
Zhang H, Li X, et al. Significance and Mechanism of Androgen Receptor (AR) Overexpression and AR-mTOR Crosstalk in Hepatocellular Carcinoma. Hepatology. 2017 Dec 8. doi: 10.1002/hep.29715.

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    2018-11-23 xjy02
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    2017-12-14 gwc384
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    2017-12-12 1ddf0692m34(暂无匿称)

    学习了.好文章

    0

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