J Clin Invest:发现前列腺细胞命运决定的机制,与前列腺癌细胞的管腔细胞表型高度相关

2020-07-31 BioArt

肿瘤的起始和进展过程中往往伴随着肿瘤细胞的退分化现象,但早期对去势治疗敏感的前列腺癌细胞却维持着终末分化的管腔细胞表型。研究表明前列腺癌细胞中基因突变较少,但是却都存在大量的染色体缺失、重排等异常现象

肿瘤的起始和进展过程中往往伴随着肿瘤细胞的退分化现象,但是早期对去势治疗敏感的前列腺癌细胞却维持着终末分化的管腔细胞表型。近期的研究表明,前列腺癌细胞中基因突变较少,但是却都存在大量的染色体缺失、重排、融合、扩增等异常现象。其中有50%的前列腺癌病人含有TMPRSS2基因与ERG基因融合,这也是目前在前列腺癌中最普遍的一种染色体重排。

虽然TMPRSS2-ERG基因的融合是前列腺癌病人中最常见的一种基因重排,但是目前TMPRSS2-ERG基因融合仅作为一种检测前列腺癌的一种分子标识。前列腺癌细胞中这种大量存在的染色体异常可能与前列腺细胞的命运决定密切相关,但是前列腺癌细胞的命运决定机制却一直是前列腺癌研究领域悬而未决的重要科学问题。

近日,中国科学院分子细胞科学卓越创新中心(生物化学与细胞生物学研究所)高栋课题组与中国科学院数学与系统科学研究院王勇研究员和纪念斯隆-凯特琳癌症中心陈俞教授合作在Journal of Clinical Investigation杂志上在线发表题为 “ERG orchestrates chromatin interactions to drive prostate cell fate reprogramming”的研究成果。该研究利用类器官培养技术、基因工程编辑小鼠、CRISPR-Cas9基因编辑技术、多组学测序技术和生物信息学数据分析发现TMPRSS2-ERG融合基因通过调控染色质的相互作用来决定前列腺细胞的命运,与前列腺癌细胞的管腔细胞表型高度相关。

首先,为了研究TMPRSS2-ERG融合基因与前列腺细胞命运决定的关系,高栋研究组的研究人员通过构建过表达TMPRSS2-ERG融合基因的基因工程小鼠和前列腺类器官,并通过病理学和分子细胞生物学检测,结合转录组测序(RNA-Seq)、染色质开放性测序(ATAC-Seq)、染色质免疫共沉淀测序(ChIP-Seq)进一步阐明TMPRSS2-ERG融合基因是前列腺细胞命运决定的关键转录因子。其次,通过RNA-Seq、ATAC-Seq和ChIP-Seq的生物信息学整合分析发现Trp63和TMPRSS2-ERG融合基因是决定前列腺细胞命运的两大关键转录因子。

进一步,研究人员通过三维染色体构象捕获技术(BL-Hi-C)和ChIP-Seq整合分析发现调控Trp63表达的超级增强子,并且发现TMPRSS2-ERG通过结合这一调控Trp63表达的超级增强子来降低Trp63的表达,从而决定前列腺细胞的命运。最后,通过CRISPR-Cas9基因编辑技术将TMPRSS2-ERG在这一超级增强子内的结合位点敲除以后,发现前列腺癌细胞的命运出现逆转。综上所述,这一研究解析了早期前列腺癌细胞维持着终末分化命运的原因,发现了TMPRSS2-ERG融合基因是前列腺细胞命运决定的关键转录因子。

据悉,分子细胞科学卓越中心高栋研究员为本文的通讯作者,中国科学院数学与系统科学研究院王勇研究员和纪念斯隆-凯特琳癌症中心陈俞教授为共同通讯作者,高栋研究组的博士生李飞、夏欣祎、王勇课题组的苑秋月为本文共同第一作者。

原始出处:

Fei Li 1, Qiuyue Yuan 2, Wei Di 1, et al.ERG orchestrates chromatin interactions to drive prostate cell fate reprogramming,J Clin Invest. 2020 Jul 23;137967. doi: 10.1172/JCI137967.

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    2020-08-02 yxch36
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    2020-08-02 tastas
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    2020-07-31 肿肿

    机制研究离临床仍然有距离,不过与临床结合思考,仍然有帮助的,不能仅仅是纯临床思维,转化思维同样重要

    0

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    2020-07-31 misszhang

    前列腺癌相关研究,学习了,谢谢梅斯

    0

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