Targeting Glioblastoma Stem Cells: Structure-Activity Relationship of Potent Diaryl Acrylonitrile Resveratrol Analogs

Targeting Glioblastoma Stem Cells: Structure-Activity Relationship of Potent Diaryl Acrylonitrile Resveratrol Analogs

Alvin Sherman Library

Glioblastoma (GBM) is an aggressive brain tumor that presents significant treatment challenges due to its infiltrative nature and therapy resistance. Elimination of GBM stem cells (GSCs), which drive tumor progression and treatment resistance, is essential for a successful outcome. Resveratrol (RSV), a natural compound with anticancer properties, shows limited therapeutic potential due to poor bioavailability, prompting the development of more potent analogs. In this study, 80 diaryl acrylonitrile RSV analogs were synthesized via Knoevenagel condensation and evaluated for their cytotoxicity toward GSCs using MTS assay. Among these compounds, E03 exhibited notable activity, with an average GSC IC50 value of 106 nM, representing an approximate 1000-fold increase in cytotoxicity compared to RSV. Structure-activity relationship analyses (SARs) revealed that methoxy substitution at the 4- position on phenyl ring of the aromatic aldehyde of the stilbene structure in the “03-series” compounds is essential for activity, significantly enhancing GSC cytotoxicity. In contrast, nitro-substituted analogs promoted cell differentiation rather than apoptosis, further emphasizing the importance of specific structural modifications. These findings highlight the critical role of methoxy group positioning in driving selective cytotoxic effects and provide valuable insights into the SAR of diaryl acrylonitrile analogs. Ongoing studies aim to uncover E03’s mechanism of action by analyzing its impact on key GBM drivers, including EGFR and the PI3K/AKT/mTOR signaling pathway. This research provides a solid foundation for the development of resveratrol-inspired analogs as innovative therapeutic candidates for this aggressive disease. Notably, E03 and its related analogs show significant promise as lead compounds for effectively targeting GSCs.