Molecular Cell:科学家发现MYC促进癌症发生新伙伴

2015-04-07 佚名 生物谷

近日,著名国际学术期刊Molecular Cell在线发表了美国科学家的一项最新研究进展,他们发现癌基因MYC与染色质结合发挥基因调控功能需要一个关键因子的协同作用,阻断两者相互作用会影响MYC对iPSC的诱导以及对体内肿瘤转化的促进。这一发现对于抑制MYC相关的肿瘤生长治疗癌症具有重要意义。   MYC是一类具有转录因子功能的癌蛋白,在大部分恶性肿瘤中均存在过表达现象。MYC的促癌

近日,著名国际学术期刊Molecular Cell在线发表了美国科学家的一项最新研究进展,他们发现癌基因MYC与染色质结合发挥基因调控功能需要一个关键因子的协同作用,阻断两者相互作用会影响MYC对iPSC的诱导以及对体内肿瘤转化的促进。这一发现对于抑制MYC相关的肿瘤生长治疗癌症具有重要意义。
 
MYC是一类具有转录因子功能的癌蛋白,在大部分恶性肿瘤中均存在过表达现象。MYC的促癌潜能主要是因为其能够与数千个靶基因的调控序列结合,调节靶基因表达,影响细胞生长、增殖、代谢、基因组稳定和凋亡过程,并且这种潜能还依赖于myc与其结合因子 MAX的相互作用形成异二聚体,从而实现与DNA的结合。
 
研究人员通过酵母双杂交和蛋白质组筛选的方法发现MYC与染色质的广泛结合也依赖于与WD40-重复蛋白 WDR5的相互作用。WDR5在多种染色质调节复合物中发挥重要功能,如H3K4甲基转移酶。MYC能够通过其进化保守的"MYC box IIIb"序列与WDR5表面较浅的疏水裂隙相互作用,结合在一起。研究人员通过实验证实,对MYC进行突变能够阻断MYC与WDR5的结合,降低MYC与染色质结合位点的结合作用。研究人员检测了MYC与OCT3/4,SOX2和KLF4协同诱导小鼠胚胎成纤维细胞重编程形成iPSC的能力,结果表明携带突变的Myc不能有效诱导iPSC形成。然后研究人员又进行了体外和体内肿瘤转化实验,发现MYC与WDR5的相互作用对体外转化过程并非必须的,但在体内的肿瘤发生过程中发挥了至关重要的作用。
 
这项研究表明WDR5是影响MYC与染色质相互作用的关键因素,阻断MYC与WDR5的相互作用会抑制MYC促进iPSC形成以及驱动癌症发生的能力,并提出可针对WDR5开发治疗MYC驱动肿瘤的靶向治疗药物,将具有重大应用价值。

原始出处:

Lance R. Thomas, Qingguo Wang8, Brian C. Grieb et al.Interaction with WDR5 Promotes Target Gene Recognition and Tumorigenesis by MYC.Molecular Cell, 26 March, 2015.DOI: http://dx.doi.org/10.1016/j.molcel.2015.02.028

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    2015-05-29 维他命
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    2015-05-24 ljjj1053

    不错,学习了

    0

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    2015-04-08 guihongzh

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