Progress in the development of modulators targeting Frizzleds

Area of Science:

• Cellular Biology
• Molecular Pharmacology
• Biochemistry

Background:

• Frizzled receptors (FZDs) are G protein-coupled receptors (GPCRs) crucial for WNT signaling pathways.
• FZDs play significant roles in tissue regeneration and cancer development.
• Understanding FZD activation mechanisms is vital for therapeutic development.

Purpose of the Study:

• To review recent Frizzled receptor modulators (inhibitors and agonists).
• To summarize discovery processes and mechanisms of action for key FZD modulators.
• To provide insights for future development of FZD-targeting therapeutics.

Main Methods:

• Literature review of recently reported FZD modulators.
• Analysis of structural and pharmacological mechanisms of FZD modulators.
• Categorization of modulators based on their interaction sites (CRD, intracellular domains, transmembrane domain).

Main Results:

• FZD inhibitors primarily target the cysteine-rich domain (CRD).
• Some small molecules target intracellular or transmembrane domains to impede activation.
• Specific small molecules (FZM1.8, SAG1.3, purmorphamine) and antibodies activate FZDs via distinct mechanisms.

Conclusions:

• FZD modulators offer therapeutic potential for cancer and degenerative diseases.
• Diverse mechanisms of FZD modulation are being elucidated.
• This review provides a foundation for developing novel FZD-targeting drugs.