A useful approach to identify novel small-molecule inhibitors of Wnt-dependent transcription

Area of Science:

• Oncology
• Molecular Biology
• Drug Discovery

Background:

• The Wnt signaling pathway is crucial in development and frequently dysregulated in various cancers.
• Mutations in key Wnt pathway components like APC, beta-catenin, and axin are common drivers of cancer.
• Targeting the Wnt pathway presents a promising therapeutic strategy for Wnt-dependent tumors.

Purpose of the Study:

• To identify novel small-molecule inhibitors of the Wnt signaling pathway.
• To develop potential therapeutic agents for treating cancers with constitutive Wnt signaling.
• To establish a screening method for discovering Wnt pathway inhibitors.

Main Methods:

• Screening of a diverse chemical library using a Wnt pathway reporter cell line.
• Induction of Wnt pathway activity at the Disheveled protein level.
• Deconvolution studies to isolate and characterize active compound series.
• Assessing compound activity by measuring beta-catenin degradation, even when stabilized by GSK-3 inhibitors.

Main Results:

• Identification of three distinct compound series with selective anti-cancer activity.
• Demonstration that identified compounds induce the degradation of beta-catenin.
• Confirmation of selective killing of cancer cell lines exhibiting constitutive Wnt signaling.
• Validation of the screening approach for discovering Wnt pathway inhibitors.

Conclusions:

• The study successfully identified small-molecule inhibitors targeting the Wnt signaling pathway.
• The identified compounds exhibit selective toxicity towards cancer cells dependent on Wnt signaling.
• This screening approach provides a foundation for developing novel therapeutics for Wnt-driven cancers.
• The ability to induce beta-catenin degradation is a key mechanism of action for these inhibitors.