Wingless-type MMTV integration site family (Wnt)

Wnt ligands are a family of 19 secreted, lipid-modified glycoproteins that serve as critical mediators of intercellular communication. They regulate a wide array of biological processes, including embryonic development, cell fate determination, and the maintenance of adult stem cell niches (Nusse & Clevers, 2017, PMID: 28157417). Upon secretion, Wnt ligands bind to Frizzled (FZD) receptors and Low-density lipoprotein receptor-related protein 5/6 (LRP5/6) co-receptors to initiate the canonical beta-catenin signaling pathway or various non-canonical pathways. Aberrant Wnt signaling is strongly linked to oncogenesis, particularly in colorectal, breast, and liver cancers, where it promotes tumor growth and metastasis (Zhan et al., 2017, PMID: 28088914). Therapeutic interventions targeting the extracellular Wnt environment include Porcupine inhibitors, which prevent the essential palmitoylation and secretion of Wnt proteins, and decoy receptors like Frizzled-Fc fusion proteins that sequester ligands (Jimeno et al., 2017, PMID: 28807987). Despite their therapeutic potential, targeting Wnt ligands is complicated by their essential roles in gut homeostasis and bone metabolism, leading to significant safety concerns such as gastrointestinal distress and decreased bone density (Kahn, 2014, PMID: 25236395).

Other names

Wnt ligandsWingless-related integration siteWnt proteinsWnt family

Inhibition of Porcupine-mediated O-palmitoylation to prevent Wnt secretion; Sequestration of extracellular Wnt ligands by decoy receptors (e.g., Frizzled-Fc fusions); Competitive inhibition of Wnt binding to Frizzled receptors.