在复发的ALL中,folylpolyglutamate合成酶的失活会诱导可药物治疗的叶酸代谢脆弱性
Hui Li1, Yao Chen2, Ming Ding2
1Pediatric Translational Medicine Institute, Key Laboratory of Pediatric Hematology & Oncology Ministry of Health, Department of Hematology & Oncology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Fujian Children's Hospital, Fujian Branch of Shanghai Children's Medical Center Affiliated to Shanghai Jiao Tong University School of Medicine, Fuzhou, China.
概括
复发性急性淋巴细胞白血病 (ALL) 中的甲甲酸耐药性源于非活化FPGS突变. 这造成了可用抗叶酸三甲酸 (TMQ) 治疗的叶酸脆弱性.
科学领域:
- 在瘤学瘤学.
- 生物化学 生物化学
- 遗传学 遗传学 是一个
背景情况:
- 甲托雷克萨特 (MTX) 是急性淋巴细胞白血病 (ALL) 的关键药物.
- 在复发ALL中MTX化学抵抗的机制尚未完全理解.
- 叶酸代谢在ALL治疗疗效方面起着至关重要的作用.
研究的目的:
- 研究复发ALL中MTX耐药性的机制.
- 确定导致复发和化疗抵抗的遗传变化.
- 评估针对叶酸代谢的新型治疗策略.
主要方法:
- 综合系统生物学分析来自ALL复发队列的转录和基因组数据.
- 药物敏感性测试用于评估FPGS突变对抗叶酸有效性的影响.
- 液体染色学-质谱学 (LC-MS) 用于量化叶酸和MTX水平.
- 在体内评估使用来自ALL细胞系的老鼠异种移植模型.
主要成果:
- 在复发的ALL中观察到的叶酸多聚氨基化网络活性下降.
- 确定了多因素的FPGS失活机制,包括突变,基因删除,活性受损和降解增加.
- FPGS的失活导致MTX耐药性和细胞内叶酸耗尽.
- 脂友性抗叶酸三次 (TMQ) 在体外和体内有效地向缺乏叶酸的ALL细胞.
结论:
- FPGS的失活是复发ALL中MTX耐药性的关键机制.
- 这种无活化会造成叶酸代谢的脆弱性.
- 抗叶酸三甲基 (TMQ) 提供了一个有前途的治疗策略,以克服复发ALL的MTX耐药性.
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