Structural Optimization of Pyrazole Compounds as Hsp90 Regulators with Enhanced Antitumor Activity
Targeting Hsp90 is an effective strategy for cancer therapy. TAS-116 has been approved for the treatment of gastrointestinal stromal tumors. Our previous studies identified a series of pyrazole derivatives as covalent Hsp90 inhibitors that allosterically disrupt the Hsp90-Cdc37 interaction. Here, th...
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2025
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| Summary: | Targeting Hsp90 is an effective strategy for cancer therapy. TAS-116 has been approved for the treatment of gastrointestinal stromal tumors. Our previous studies identified a series of pyrazole derivatives as covalent Hsp90 inhibitors that allosterically disrupt the Hsp90-Cdc37 interaction. Here, through systematic structure–activity relationship (SAR) optimization, compound <b>39</b> (<b>DDO-6691</b>) with a new covalent warhead was developed, which demonstrates improved ADME properties and significantly enhanced antitumor activity. Notably, parental HCT-116 cells exhibited markedly greater sensitivity to compound <b>39</b> (IC<sub>50</sub> > 50 μM) compared to their Cdc37-knockout counterparts. Importantly, compound <b>39</b> displayed potent tumor growth inhibition in HCT-116 xenograft mouse models. These collective findings underscore the therapeutic promise of covalent Hsp90-targeted disruption of the Hsp90-Cdc37 complex, offering a novel mechanistic approach to cancer treatment. |
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