在骨髓白血病中通过重新编程的BCAA代谢导致癌症的进展
Ayuna Hattori1,2, Makoto Tsunoda3, Takaaki Konuma4
1Department of Biochemistry and Molecular Biology, Franklin College of Arts and Sciences, The University of Georgia, Athens, Georgia 30602, USA.
Nature
|May 18, 2017
概括
由BCAT1调节的分支链氨基酸 (BCAA) 代谢驱动慢性髓性白血病 (CML) 的进展. 针对MSI2-BCAT1途径为髓性白血病提供了一种新的治疗策略.
科学领域:
- 癌症学
- 代谢途径
- 癌症生物学
背景情况:
- 重新编程的细胞代谢是癌症的标志, 但它在癌症发展中的直接作用尚不清楚.
- 分链氨基酸 (BCAA) 是必需的营养素,它们在癌症中的代谢失调需要进一步研究.
- 慢性骨髓性白血病 (CML) 是一种由特定的遗传突变和细胞功能改变而形成的骨髓增殖性瘤.
研究的目的:
- 研究BCAT1,一个BCAA氨基转移酶在慢性髓性白血病 (CML) 的发展和进展中的作用.
- 阐明控制CML中BCAT1表达的调节机制.
- 确定向BCAT1的治疗潜力.
主要方法:
- 在人类CML样本和小鼠模型中分析BCAT1表达.
- 在体外和体内实验评估BCAT1抑制对CML细胞的功能影响.
- 稳定同位素追踪实验和核磁共振 (NMR) 代谢学来追踪BCAA代谢.
- 包括Musashi2 (MSI2) 在内的BCAT1上游调节者的识别和描述.
主要成果:
- 在CML中,BCAT1被异常激活,并且在功能上是必需的,促进白血病细胞中的BCAA产生.
- 在体外和体内,BCAT1的抑制会诱导细胞分化并阻碍CML的进展.
- 通过补充BCAA来挽救BCAT1的淘汰效应,证实其在BCAA生产中的作用.
- 一种致癌性RNA结合蛋白MSI2直接调高BCAT1的表达,形成MSI2-BCAT1轴.
- 在CML和急性髓性白血病患者中,BCAT1表达预测疾病的结果.
结论:
- 通过改变BCAA代谢,MSI2-BCAT1轴驱动骨髓性白血病的癌症进展.
- 在CML中,BCAT1是关键的致癌因子,也是潜在的治疗点.
- 向MSI2-BCAT1通路是治疗髓性白血病的一个有希望的策略.
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