Hsp90的高亲和度构造赋予了Hsp90抑制剂的瘤选择性
Adeela Kamal1, Lia Thao, John Sensintaffar
1Conforma Therapeutics Corporation, 9393 Towne Centre Drive, Suite 240, San Diego, California 92121, USA.
Nature
|September 26, 2003
概括
癌细胞中的热冲击蛋白90 (Hsp90) 对药物17-AAG的亲和力比正常细胞高100倍. 这种差异是由于瘤Hsp90处于激活复合体中,提供了潜在的癌症治疗点.
科学领域:
- 分子生物学分子生物学
- 在瘤学瘤学.
- 生物化学 生物化学
背景情况:
- 热冲击蛋白90 (Hsp90) 是一个分子伴侣,对瘤信号蛋白的功能至关重要.
- 像17-allylaminogeldanamycin (17-AAG) 这样的hsp90抑制剂诱导这些客户端蛋白质的降解,并显示选择性癌细胞杀死.
- Hsp90抑制剂这种瘤选择性的分子基础在很大程度上仍然未知.
研究的目的:
- 研究Hsp90抑制剂瘤选择性的分子基础.
- 为了比较17-AAG与Hsp90从瘤细胞与正常细胞的结合亲和力.
主要方法:
- 生物化学试验测量17-AAG与瘤和正常细胞中的Hsp90的结合亲和力.
- 在瘤和正常细胞中分析Hsp90复合体形成和ATPase活性.
- 在实验室中复制Hsp90伴侣复合物.
主要成果:
- 来自瘤细胞的Hsp90与来自正常细胞的Hsp90相比,对17-AAG的结合亲和力高出100倍.
- 瘤Hsp90被发现在具有高ATPase活性的活跃多合体复合体中,而正常的Hsp90则处于潜伏的,未复杂的状态.
- 在实验室中将Hsp90复制成伴侣复合物增加了它对17-AAG的结合亲和力,并增强了ATPase活性.
结论:
- 瘤细胞具有激活的Hsp90复合体,具有高亲和度的形状,促进恶性进展.
- 这种激活的Hsp90复合体代表了癌症治疗的潜在独特治疗标.
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