Deciphering the Comprehensive Structure-Activity Relationship of Sunshinamide for Breast Cancer Therapy through Dual...

Area of Science:

• Medicinal Chemistry
• Molecular Biology
• Cancer Research

Background:

• Sunshinamide, a cyclodepsipeptide, exhibits anticancer properties.
• Understanding the structure-activity relationship (SAR) of sunshinamide is crucial for its therapeutic development.
• Existing research established the synthesis and preliminary anticancer effects of sunshinamide.

Purpose of the Study:

• To elucidate the SAR of sunshinamide.
• To investigate the mechanistic insights of sunshinamide's anticancer action in vitro and in vivo.
• To explore sunshinamide's potential in overcoming chemoresistance.

Main Methods:

• Structure-activity relationship (SAR) studies were conducted.
• Mechanistic studies involved assessing targets such as TrxR1 and Gpx4.
• In vitro and in vivo experiments evaluated apoptosis, reactive oxygen species (ROS) generation, ER-stress, lipid peroxidation, and ferroptosis induction.

Main Results:

• SAR studies identified the bicyclic-ring and disulfide moiety as critical for anticancer activity.
• Sunshinamide was found to target TrxR1, inducing ROS and ER-stress-mediated apoptosis.
• Sunshinamide also targets Gpx4, promoting lipid peroxidation and ferroptosis.

Conclusions:

• Sunshinamide effectively reduces tumor growth in vivo by inducing both apoptosis and ferroptosis.
• The dual apoptotic and ferroptotic mechanisms highlight sunshinamide's potential as a novel breast cancer therapeutic.
• Sunshinamide offers a promising strategy to address chemoresistance in cancer treatment.