PKM2可酸化基因组H3并促进基因转录和瘤发生
Weiwei Yang1, Yan Xia, David Hawke
1Brain Tumor Center and Department of Neuro-Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
Cell
|August 21, 2012
概括
瘤蛋白PKM2直接修改了基因组H3,影响了基因转录和脑瘤生长. 这种蛋白激酶活性对表观遗传调节至关重要,并提供潜在的治疗点.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 酸盐激酶M2 (PKM2) 在瘤中驱动华堡效应.
- PKM2还通过非代谢功能调节基因转录.
- 对于PKM2的转录调节的确切机制尚未完全理解.
研究的目的:
- 阐明PKM2调节基因转录的非代谢机制.
- 调查PKM2在基因素修饰中的作用及其对瘤发生的影响.
主要方法:
- 研究了PKM2与基因素H3的结合.
- 分析了在T11处的基因组H3酸化和在K9.处的乙化.
- 评估了HDAC3与目标基因促进体的分离.
- 评估了对cyclin D1和c-Myc表达的影响.
- 与PKM2表达,质瘤等级和预后相关的基因组修饰水平.
主要成果:
- 在EGF受体激活时,PKM2在T11处直接结合并化希斯H3.
- 这种酸化促进了HDAC3与CCND1和MYC促进体的解离.
- 基因组基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因
- 这些表观遗传变化对于瘤细胞的增殖,细胞循环的进展和大脑瘤发生至关重要.
- 基因素H3 T11酸化水平与核PKM2,质瘤等级和患者预后相关.
结论:
- 在其非代谢作用中,PKM2 作为蛋白激酶起作用,修改 histone H3.3.
- 在表观遗传基因调节和瘤发生过程中,PKM2介导的基因素修饰是必不可少的.
- 基斯H3 T11酸化作为质瘤恶性和预后的潜在生物标志物.
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