Oridonin ring A-based diverse constructions of enone functionality: identification of novel dienone analogues effective for highly aggressive breast cancer by inducing apoptosis

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Organic Synthesis

Background:

• Oridonin (1) possesses anticancer properties but shows limited efficacy against aggressive and drug-resistant breast cancers.
• There is a need for novel anticancer agents with improved potency and broader applicability.

Purpose of the Study:

• To design and synthesize novel dienone derivatives based on the Oridonin scaffold.
• To evaluate the in vitro and in vivo antitumor activity of these new analogues against aggressive and drug-resistant breast cancer cells.

Main Methods:

• Rational design and synthesis of dienone derivatives featuring an α,β-unsaturated ketone system.
• Development of efficient and regioselective enone construction strategies.
• Identification of a unique 3,7-rearrangement reaction for novel scaffold generation.

Main Results:

• Successfully synthesized novel dienone analogues with diverse A-ring modifications.
• Demonstrated significant induction of apoptosis and inhibition of colony formation in aggressive breast cancer cells.
• Achieved superior antitumor effects in vitro and in vivo compared to Oridonin.
• Exhibited comparable or lower toxicity to normal human mammary epithelial cells.

Conclusions:

• The novel dienone derivatives exhibit enhanced anticancer efficacy against aggressive and drug-resistant breast cancer.
• These compounds represent a promising new class of anticancer agents with a favorable safety profile.