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由c-Myc控制的HnRNP蛋白质去调节酸激酶mRNA在癌症中的拼接
Charles J David1, Mo Chen, Marcela Assanah
1Department of Biological Sciences, Columbia University, New York, New York 10027, USA.
Nature
|December 17, 2009
概括
癌症细胞利用有氧糖解来增长,通过表达胚胎的酸盐激酶异型 (PKM2). 这项研究确定了hnRNP和c-Myc作为PKM2剪接的关键调节者,这对瘤增殖至关重要.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 细胞代谢 细胞代谢
背景情况:
- 静止细胞使用氧化酸化,而瘤细胞表现出有氧糖解,即使有氧,也将葡萄糖转化为乳酸.
- 有氧糖解对于瘤细胞生长至关重要,并由酸盐激酶 (PK) 异形表达来调节.
- 胚胎PKM2异型促进有氧糖解,并在癌症中重新表达,与成年PKM1异型形成鲜明对比,这种异型有利于氧化酸化.
研究的目的:
- 阐明控制PKM前mRNA替代拼接的调控机制,导致PKM2在癌症中被纳入.
- 研究异质核核核糖核蛋白 (hnRNP) 和c-Myc在PKM2表达中的作用及其与瘤增殖的联系.
主要方法:
- 在PKM前mRNA中对替代拼接事件的分析.
- 识别与调节序列结合的hNRNP蛋白质.
- 研究c-Myc在调节hNRNP表达中的作用.
- 人类质瘤中蛋白质表达的相关性分析.
主要成果:
- 发现三种hnRNP (PTB,hnRNPA1,hnRNPA2) 抑制性地结合到对着第9个外因子的序列,促进第10个外因子的包含 (PKM2).
- 瘤转录因子c-Myc对PTB,hNRNPA1和hNRNPA2进行上调,从而增加PKM2/PKM1比率.
- 人类质瘤显示c-Myc,PTB,hNRNPA1和hNRNPA2的过度表达,与PKM2表达相关.
结论:
- 一个涉及hNRNP和c-Myc的新途径调节PKM的替代拼接,有利于PKM2在癌症中的表达.
- 这一途径对于维持瘤细胞增殖所需的高PKM2/PKM1比率至关重要.
- 这些发现提供了对瘤生长至关重要的代谢重编程的见解,并建议潜在的治疗点.
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