SCF(FBW7) 通过向MCL1进行无处不在和破坏来调节细胞亡
Hiroyuki Inuzuka1, Shavali Shaik, Ichiro Onoyama
1Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue, Boston, Massachusetts 02215, USA.
Nature
|March 4, 2011
概括
在T细胞急性淋巴细胞白血病 (T-ALL) 中,瘤抑制剂FBW7的丧失导致MCL1的过度表达,促进细胞存活. 恢复FBW7或消耗MCL1会使T-ALL细胞对向治疗重新敏感.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症遗传学 癌症遗传学
背景情况:
- 失去FBW7 (一种瘤抑制剂) 在癌症中很常见,包括T细胞急性淋巴细胞白血病 (T-ALL).
- FBW7针对Jun,Myc和Notch1等基蛋白进行降解,但FBW7缺乏细胞如何逃避亡尚不清楚.
- 了解FBW7的瘤抑制机制对于确定有效的向疗法至关重要.
研究的目的:
- 阐明FBW7损失对T-ALL病原发生有助的分子机制.
- 为了研究FBW7缺乏的T-ALL细胞如何逃避被编程的细胞死亡.
- 为了确定FBW7缺乏T-ALL的治疗策略.
主要方法:
- 研究了E3泛基因酶SCF(FBW7) 在调节亡中的作用.
- 分析了SCF ((FBW7) 以酸化依赖的方式对MCL1,一种促生存蛋白的向.
- 评估了人类T-ALL细胞系中FBW7损失和MCL1过度表达之间的相关性.
- 评估了FBW7缺乏T-ALL细胞对向抑制剂 (如索拉芬尼和ABT-737.7) 的敏感性.
主要成果:
- SCF(FBW7) 针对MCL1进行无处不在和降解,这一过程依赖于糖原合成酶激酶3酸化.
- 人类T-ALL细胞系与FBW7损失呈现高MCL1水平.
- 缺乏FBW7的T-ALL细胞对索拉费尼布敏感,但对ABT-737.7有抗性.
- FBW7的重新表达或MCL1的枯竭恢复了对ABT-737的敏感性,突出了MCL1在亡回避中的作用.
结论:
- FBW7通过准MCL1进行降解来直接抑制瘤,从而促进亡.
- 在FBW7缺陷的T-ALL细胞中,MCL1充当了绕道生存机制.
- 准MCL1或恢复FBW7功能对FBW7缺乏T-ALL患者具有治疗潜力.
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