Rationally Designed High-Affinity 2-Amino-6-halopurine Heat Shock Protein 90 Inhibitors That Exhibit Potent Antitumor Activity
摘要:
Heat shock protein 90 (Hsp90) is a molecular chaperone protein implicated in stabilizing the conformation and maintaining the function of many cell-signaling proteins. Many oncogenic proteins are more dependent on Hsp90 in maintaining their conformation, stability, and maturation than their normal counterparts. Furthermore, recent data show that Hsp90 exists in an activated form in malignant cells but in a latent inactive form in normal tissues, suggesting that inhibitors selective for the activated form could provide a high therapeutic index. Hence, Hsp90 is emerging as an exciting new target for the treatment of cancer. We now report on a novel series of 2-amino-6-halopurine Hsp90 inhibitors exemplified by 2-amino-6-chloro-9-(4-iodo-3,5-dimethylpyridin-2-ylmethyl)purine (30). These highly potent inhibitors (IC50 of 30 = 0.009 mu M in a HER-2 degradation assay) also display excellent antiproliferative activity against various tumor cell lines (IC50 of 30 = 0.03 mu M in MCF7 cells). Moreover, this class of inhibitors shows higher affinity for the activated form of Hsp90 compared to our earlier 8-sulfanylpurine Hsp90 inhibitor series. When administered orally to mice, these compounds exhibited potent tumor growth inhibition (> 80%) in an N87 xenograft model, similar to that observed with 17-allylamino-17-desmethoxygeldanamycin (17-AAG), which is a compound currently in phase I/II clinical trials.
2-Aminopurine analogs having HSP90-inhibiting activity
申请人:Kasibhatla Rao Srinivas
公开号:US20050113340A1
公开(公告)日:2005-05-26
2-Aminopurine analogs are described and demonstrated or predicted to have utility as Heat Shock Protein 90 (HSP90) inhibiting agents in the treatment and prevention of various HSP90 mediated disorders, e.g., proliferative disorders. Method of synthesis and use of such compounds are also described and claimed.
2-Aminopurine Analogs Having HSP90-Inhibiting Activity
申请人:Kasibhatla Rao Srinivas
公开号:US20070185064A1
公开(公告)日:2007-08-09
2-Aminopurine analogs are described and demonstrated or predicted to have utility as Heat Shock Protein 90 (HSP90) inhibiting agents in the treatment and prevention of various HSP90 mediated disorders, e.g., proliferative disorders. Method of synthesis and use of such compounds are also described and claimed.
Heterobicyclic compounds of formula I are described and demonstrated to have utility as Heat Shock Protein 90 (HSP90) inhibiting agent. Method of synthesis and use of such compounds are also described.
描述并证明了式 I 的杂双环化合物作为热休克蛋白 90(HSP90)抑制剂的实用性。还描述了合成和使用此类化合物的方法。