β-Ionone derived apoptosis inducing endoperoxides; Discovery of potent leads for anticancer agents

Area of Science:

• Medicinal Chemistry
• Cancer Biology
• Pharmacology

Background:

• Endoperoxides are a class of compounds with diverse biological activities.
• Cancer remains a leading cause of mortality worldwide, necessitating the development of novel therapeutic agents.
• Targeting cancer cell apoptosis is a key strategy in chemotherapy.

Purpose of the Study:

• To synthesize a series of novel endoperoxide derivatives.
• To evaluate the cytotoxic and apoptotic potential of these compounds against human cancer cell lines.
• To elucidate the mechanism of action, particularly the role of the mitochondrial pathway in endoperoxide-induced apoptosis.

Main Methods:

• Synthesis of endoperoxide compounds (3a-j).
• Cytotoxicity evaluation using the Sulforhodamine B (SRB) dye assay against four human cancer cell lines.
• Apoptosis assessment in A549 lung cancer cells via flow cytometry (nuclear DNA, mitochondrial membrane potential), ROS level estimation, and caspase-3 & 9 assays.

Main Results:

• All synthesized endoperoxides (3a-j) demonstrated moderate to high cytotoxic effects against tested cancer cell lines.
• Nitro-substituted (3j) and fluoro-substituted (3i) endoperoxides displayed superior cytotoxicity compared to standard drugs against A549 lung cancer cells.
• Endoperoxides were found to induce apoptosis in A549 cells, mediated through the mitochondrial pathway, evidenced by changes in mitochondrial membrane potential, ROS levels, and caspase activation.

Conclusions:

• The synthesized endoperoxides possess significant cytotoxic and apoptotic potential against human cancer cells.
• Compounds 3i and 3j are promising candidates for further development as anticancer agents, particularly for lung cancer.
• The mitochondrial pathway is a key mechanism through which these endoperoxides exert their anticancer effects.