Triadic Electrophilic Centers Specifically Bind to SMO Transmembrane Domain to Inhibit the Hedgehog Pathway

Area of Science:

• Medicinal Chemistry
• Molecular Biology
• Oncology

Background:

• Targeting the Hedgehog signaling pathway is crucial for cancer therapy.
• Overexpressed smoothened (SMO) is a key target.
• Existing SMO inhibitors are limited.

Purpose of the Study:

• To develop novel metallodrugs targeting SMO.
• To investigate a new drug design strategy using triadic electrophilic centers.
• To evaluate the efficacy of these metallodrugs in inhibiting SMO and cancer growth.

Main Methods:

• Design and synthesis of metallodrugs (RuSe, OsSe, RuIP, OsIP) with triadic electrophilic centers.
• In vitro and in vivo experiments to assess SMO inhibition and anti-tumor activity.
• Theoretical calculations and experimental data analysis to elucidate the binding mechanism.

Main Results:

• The designed metallodrugs selectively inhibited SMO activity.
• These drugs effectively blocked the Hedgehog signaling pathway.
• Tumor growth was significantly inhibited in vivo.
• The drugs bind to SMO by anchoring at the hinge region between TM5 and TM6, strengthening π-cation lock interactions.

Conclusions:

• A novel strategy for designing SMO-specific metallodrugs was established.
• The triadic electrophilic center design offers a promising approach for targeted cancer therapy.
• These findings provide new hope for developing effective SMO-targeted drugs.