在NT5C2突变复发性急性淋巴细胞白血病中的克隆进化机制
Gannie Tzoneva1, Chelsea L Dieck1, Koichi Oshima1
1Institute for Cancer Genetics, Columbia University, New York, New York 10032, USA.
Nature
|January 18, 2018
概括
在NT5C2基因驱动器中获得功能突变通过赋予化疗耐药性导致急性淋巴细胞白血病 (ALL) 复发. 通过向 purin 合成,抑制 IMPDH 是对治疗 NT5C2 突变 ALL 的有前途的.
科学领域:
- * 血液学
- * 分子生物学
- * 癌症研究
背景情况:
- * 复发性急性淋巴细胞白血病 (ALL) 的预后不佳,且耐化疗.
- * 5'- 核酶,细胞系II (NT5C2) 基因的功能获取突变与复发性ALL中的6- 墨素耐药性有关.
- 在白血病的发病,进展和复发中,NT5C2突变驱动的克隆进化机制尚未完全理解.
研究的目的:
- * 研究NT5C2突变在复发ALL的克隆进化中的作用.
- * 阐明NT5C2突变赋予化疗耐药性的机制.
- * 探索针对NT5C2突变ALL的潜在治疗策略.
主要方法:
- 在小鼠中使用了条件和诱导性白血病模型.
- 在白血病细胞中引入了常见的NT5C2 (R367Q) 突变.
- * 评估了化学疗法耐药性,细胞生长和白血病引发细胞活动.
- * 分析精氨酸代谢和细胞外的精氨酸输出.
- * 评估了因诺辛-5'- 单酸脱酶 (IMPDH) 抑制的有效性.
主要成果:
- * 表达NT5C2 ((R367Q) 产生了对6- 默卡普素化疗的耐药性.
- * NT5C2突变导致白血病细胞生长受损并减少白血病发起细胞活动,这表明健康成本.
- * 突变细胞表现出过多的细胞外纯素输出和耗尽的细胞内纯素核化池.
- * IMPDH的抑制显著增加了对NT5C2突变白血病淋巴细胞的毒性.
结论:
- * NT5C2突变对白血病细胞施加了适应性成本,影响了克隆进化.
- * 化学疗法耐药性和健康成本是ALL复发的主要驱动因素.
- * IMPDH抑制是治疗NT5C2突变ALL的一种潜在治疗方法.
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