Coumarins: Natural Anticoagulants and Anticancer Agents

Coumarins are a class of naturally occurring phytochemicals with diverse pharmacological activities, including anticoagulant, anti-inflammatory, antioxidant, and anticancer effects. Their anticoagulant mechanism, as observed in warfarin, involves inhibition of the vitamin K epoxide reductase complex, thereby impairing the activation of key clotting factors. Anti-inflammatory effects are mediated through the downregulation of pro-inflammatory mediators such as COX-2, TNF-α, and IL-1β, and via suppression of NF-κB and MAPK signaling pathways. Coumarins also exhibit antioxidant capacity by neutralizing reactive oxygen species, thereby protecting cellular structures from oxidative injury. Moreover, compounds like esculetin, osthole, and scopoletin have demonstrated anticancer properties as they promote apoptosis, inhibit cell proliferation, and reduce the metastatic potential of tumors. Despite their broad therapeutic usages, their clinical applications are limited by poor aqueous solubility, low bioavailability, rapid metabolic clearance, and hepatotoxic risks. Recent advancements in structural modifications, hybrid compound synthesis, nanocarrier systems, and pharmacogenomics aim to enhance the efficacy and safety of coumarins. These developments present coumarins as valuable candidates in the treatment of cardiovascular, inflammatory, neurodegenerative, and oncological disorders.