Abstract
Breast cancer remains a global health challenge, and innovative strategies are required to target estrogen receptor α (ERα), a key player in its development. This study investigates the potential of campesterol, a natural phytosterol, as an ERα inhibitor for breast cancer. Our approach integrates in silico, in vitro, and ex vivo experiments to assess the therapeutic potential of campesterol. In silico analyses highlight campesterol as a promising ERα ligand with favorable binding affinities and dynamic properties. Structural analysis reveals conformational changes in ERα upon campesterol binding. In vitro studies confirm the selective growth inhibition of campesterol against ERα-positive breast cancer cells. This study extends to ER+ breast cancer patient-derived organoids (PDOs), showing the effectiveness of campesterol in ERα-positive breast cancer PDOs. Importantly, it emphasizes the receptor-specific nature of campesterol, providing insights into its context-dependent action. In conclusion, campesterol displays potential as an ERα inhibitor, offering new avenues for ER+ breast cancer treatment.
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