Wnt-beta-catenin signaling pathway (Wnt/β-catenin pathway)

The Wnt-beta-catenin signaling pathway is a highly conserved cellular signal transduction cascade that regulates critical biological processes such as embryonic development, cell proliferation, differentiation, stem cell renewal, and tissue homeostasis. The canonical form involves secreted glycoproteins called Wnts binding to Frizzled family receptors together with co-receptors LRP5/6 at the cell surface. This event inhibits a cytoplasmic destruction complex composed mainly of Axin, APC, GSK3β, CK1α—which normally targets β-catenin for ubiquitination and proteasomal degradation. Upon inhibition by upstream signals from activated receptors, β-catenin accumulates, translocates into the nucleus where it acts as a coactivator for TCF/LEF transcription factors driving expression of genes involved in growth control such as cyclins (e.g., cyclin D1) and c-myc. Dysregulation or constitutive activation—often through mutations affecting components like APC or CTNNB1 (beta-catenin)—leads to aberrant gene expression promoting tumorigenesis across various cancers including hepatocellular carcinoma. The central role in cancer has made this pathway an attractive but challenging therapeutic target; several small molecules and biologics are under investigation aiming at different nodes within this cascade—from ligand/receptor blockade to interference with nuclear functions. Despite its promise as an anti-tumor target—and ongoing clinical trials—the essential physiological roles raise concerns about safety when systemically inhibited.[1][2][3][4]

Other names

Canonical Wnt signaling pathwayWnt/β-catenin pathwayCanonical Wnt/β-catenin signaling

Inhibition of PORCN to block secretion of Wnts, reducing activation of the pathway (LGK974). Antagonism of Frizzled receptors or direct neutralization of extracellular Wnts with monoclonal antibodies to prevent receptor activation. Stabilization or enhancement of the β-catenin destruction complex to promote degradation and prevent nuclear accumulation. Disruption/blockade of β-catenin interaction with transcription factors in the nucleus.