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Oncogene:AOX1表达的表观遗传缺失能够导致代谢异常和促进膀胱癌恶化

2019-08-19 佚名 MedSci原创

晚期膀胱癌(BLCA)仍旧是一个临床挑战,目前仍旧缺乏有效的治疗手段。最近,有研究人员阐释了BLCA中明显的、阶段性的代谢改变与醛脱氢酶(AOX1)功能的丧失有关。AOX1相关的代谢物对晚期BLCA具有很高的预测价值,并且他们的发现阐释了AOX1在BLCA恶化期间处于表观遗传沉默状态,机制是通过EZH2的甲基转移酶活性来实现。在正常膀胱上皮细胞中,AOX1的敲除能够重新连接色氨酸-尿氨酸途径,从而

晚期膀胱癌(BLCA)仍旧是一个临床挑战,目前仍旧缺乏有效的治疗手段。

最近,有研究人员阐释了BLCA中明显的、阶段性的代谢改变与醛脱氢酶(AOX1)功能的丧失有关。AOX1相关的代谢物对晚期BLCA具有很高的预测价值,并且他们的发现阐释了AOX1在BLCA恶化期间处于表观遗传沉默状态,机制是通过EZH2的甲基转移酶活性来实现。在正常膀胱上皮细胞中,AOX1的敲除能够重新连接色氨酸-尿氨酸途径,从而导致NADP水平的提高,进一步可能引起戊糖磷酸(PPP)途径代谢流的增加,从而促进核苷酸和合成增加并促进细胞浸润。NADP合成的抑制能够恢复AOX1 KD产生的代谢影响。AOX1的异位表达能够减少NADP的产生、PPP代谢流和核苷酸的合成,而在细胞系模型中减少细胞浸润,在肿瘤异种种植模型中抑制肿瘤的生长。进一步的AOX1功能获得和缺失确认了BLCA中,EZH2依赖的激活、代谢异常和肿瘤生长。

最后,研究人员指出,他们的发现强调了AOX1用于治疗的潜力,并为晚期BLCA预后标记的开发提供了基础。

原始出处:

Venkatrao Vantaku, Vasanta Putluri, David A. Bader et al. Epigenetic loss of AOX1 expression via EZH2 leads to metabolic deregulations and promotes bladder cancer progression. Oncogene. 05 Aug 2019

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    2020-02-25 cy0324
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    2019-08-21 zsyan
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    2019-08-19 留走人康

    膀胱癌真怪,明明是免疫敏感性肿瘤,为什么PD-1治疗效果不好呢?难道靶点不对?将来CD47会不会有效

    0

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