Geldanamycin derivatives that block the uPA-plasmin network and inhibit growth and invasion by glioblastoma cells and other tumors at femtomolar concentrations are potentially highly active anti-cancer drugs. GA and various 17-amino-17-demethoxygelddanamycin derivatives are disclosed that block HGF/SF-mediated Met tyrosine kinase receptor-dependent uPA activation at fM levels. Other ansamycins (macbecins I and II), GA derivatives, and radicicol required concentrations several logs higher (≧nM) to achieve such inhibition. The inhibitory activity of tested compounds was discordant with the known ability of drugs of this class to bind to hsp90, indicating the existence of a novel target(s) for HGF/SF-mediated events in tumor development. Methods of using such compounds to inhibit cancer cell activities and to treat tumors are disclosed. Such treatment with low doses of these highly active compounds provide an option for treating various Met-expressing tumors, in particular invasive brain cancers, either alone or in combination with conventional surgery, chemotherapy, or radiotherapy.
Geldanamycin衍
生物可以阻断uPA-plasmin网络,抑制胶质母细胞瘤细胞和其他肿瘤的生长和侵袭,而且在飞阿托摩尔浓度下可能是高效的抗癌药物。GA和各种17-
氨基-17-去
甲基格尔达霉素衍
生物被披露可在fM
水平上阻断
HGF/SF介导的Met
酪氨酸激酶受体依赖的uPA激活。其他ansamycins(macbecins I和II)、GA衍
生物和radicicol需要更高的浓度(≧nM)才能实现这种抑制。所测试的化合物的抑制活性与该类药物结合hsp90的已知能力不一致,表明在肿瘤发展中存在一种新的靶点(s)用于
HGF/SF介导的事件。披露了使用这些化合物来抑制癌细胞活动和治疗肿瘤的方法。使用这些高效化合物的低剂量治疗为治疗各种表达Met的肿瘤提供了一种选择,特别是侵袭性脑癌,可以单独使用或与传统的手术、化疗或放疗联合使用。