CLIN CANCER RES:糖皮质激素受体是前列腺癌细胞存活和抗雄激素治疗改善的关键因素

2018-02-28 MedSci MedSci原创

晚期前列腺癌治疗的主要障碍是内分泌治疗耐药。尽管雄激素受体与治疗失败有关,但是其耐药机制尚未完全得到阐述。糖皮质激素受体与雄激素受体密切相关,在恩杂鲁胺和多西他赛耐药中起到了一定作用。由于糖皮质激素经常用于前列腺癌患者,阐明糖皮质激素受体在前列腺癌进展中所发挥的作用至关重要。

晚期前列腺癌治疗的主要障碍是内分泌治疗耐药。尽管雄激素受体与治疗失败有关,但是其耐药机制尚未完全得到阐述。糖皮质激素受体与雄激素受体密切相关,在恩杂鲁胺和多西他赛耐药中起到了一定作用。由于糖皮质激素经常用于前列腺癌患者,阐明糖皮质激素受体在前列腺癌进展中所发挥的作用至关重要。

作者分析了177例前列腺癌患者(包括14例淋巴结转移)糖皮质激素受体表达和功能特征。在雄激素依赖、雄激素非依赖和长期抗雄激素治疗的细胞系和前列腺癌模型中进行机制研究。研究结果表明,尽管原发前列腺癌组织中糖皮质激素受体表达下降,但是在转移部位表达会恢复。高糖皮质激素表达的复发患者无进展生存更短。在大多数模型中均发现长期阿比特龙或恩杂鲁胺治疗后糖皮质激素受体表达显着增加,因此糖皮质激素受体上调是细胞雄激素受体阻断耐药的机制之一。通过RNAi或化学阻断糖皮质激素受体在所有细胞系中均可以抑制肿瘤细胞增殖。

文章最后认为,抗雄激素治疗过程中糖皮质激素受体上调是常见的机制,靶向糖皮质激素受体通路联合抗雄激素治疗可能会进一步改善前列腺癌治疗效果。

原始出处:
Martin Puhr,Julia Hoefer,et al.The Glucocorticoid Receptor Is a Key Player for Prostate Cancer Cell Survival and a Target for Improved Antiandrogen Therapy.CLIN CANCER RES.February 2018 doi:10.1158/1078-0432.CCR-17-0989

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    2018-03-02 yxch36
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    2018-02-28 183****7028

    学习

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小窝蛋白-1(CAV-1)在前列腺癌(PCa)中是过表达的,并且与不良的预后相关,但是CAV1表达到疾病恶化之间的分子机制仍旧所知甚少。最近,有研究人员利用大规模基因表达相关性分析、临床样本的定量多通道成像以及CAV1依赖的转录组分析,支持了CAV1可以使得TGFβ信号从肿瘤抑制到致瘤的转变(比如SLUG、PAI-1的诱导和CDH1、DSP和CDKN1A的抑制)。还支持了CAV1的敲除能都导致前列

Nat Commun:BMI1在前列腺癌中可以调控雄激素受体且不受多梳抑制复合物1影响

BMI1是一个多梳家族(PcG)蛋白成员,在细胞分化和增殖表观遗传调控方面具有重要的作用,同时,在癌症干细胞自我更新方面也具有重要作用。之前的研究表明,BMI1在多种癌症中表达上调,包括了前列腺癌,作为多梳蛋白复合物1(PRC1)的关键组成成分,BMI1可以通过增强RING1B的酶活性在赖氨酸119位点泛素化组蛋白H2A,从而来表现其致癌功能,并且还抑制了基因的转录。最近,有研究人员报道了BMI1

Sci Rep:利用数学模拟的前列腺癌个性化抑制研究

最近,有研究人员利用150名病人通过一个固定的治疗计划进行的间歇性雄激素抑制(IAS)治疗的数据,为每一位病人回顾性的设计了一个个性化的治疗计划。考虑到了前列腺特异性抗原(PSA)的不确定性,研究人员通过对每位病人的时间点采取随机重复取样的方法为每一位病人评估了100套参数值。之后,研究人员鉴定了3种类型并且根据以下3种类型鉴定分类:类型1:复发,即PSA的散度,可以通过IAS来抑制;类型2:复发

Urol J:患有前列腺癌且经历雄激素阻断治疗的病人中抑郁与许多风险因素之间的相关性分析

最近,有研究人员在经历雄激素阻断疗法(ADT)治疗前列腺癌的患者中鉴定了影响抑郁的因素。研究包括了那些拜访精神病门诊的患有前列腺癌的患者,并且他们都经历了ADT且伴随着抑郁症状。为了评估抑郁症状,研究人员使用了白氏抑郁症量表(BDI)。为了鉴定影响抑郁症的风险因素,研究人员进行了单变量和多变量的线性回归分析。研究发现,参与者(n=45)的平均年龄、ADT起始治疗年龄和ADT持续时间、血清睾丸素水平

CLIN CANCER RES:阻断神经内分泌分化和巨噬细胞反馈回路可以改善恩杂鲁胺对前列腺癌治疗效果

去势治疗(ADT)会导致前列腺癌产生耐药。ADT耐药与神经内分泌分化和肿瘤相关巨噬细胞有关。CLIN CANCER RES近期发表了一篇文章,研究恩杂鲁胺诱导的神经内分泌分化和肿瘤相关巨噬细胞及其机制。

Sci Rep:在前列腺癌细胞中,白花丹素诱导的差异基因表达受雄激素受体调控

小鼠获得性前列腺PTEN-P2肿瘤或者体内前列腺组织的 5-hydroxy-2-methyl-1,4-naphth oquinone(白花丹素)处理能够在去势小鼠中导致肿瘤退化,但是在完整的小鼠中没有上述情况。这表明了由于白花丹素处理,双氢睾酮(DHT)在这些睾丸中的产生也许阻止了细胞的死亡,但是潜在的机制仍旧不清楚。最近,有研究人员在白花丹素和DHT组合处理的细胞中进行了RNA-seq测序分析,