Axis inhibition protein 1 (AXIN1)

Axis inhibition protein 1 (AXIN1) is an intracellular scaffold protein that serves as a central negative regulator in the canonical Wnt/β-catenin signaling pathway, acting through the assembly of the β-catenin destruction complex and thereby controlling cell proliferation, development, and tumorigenesis[1][7]. AXIN1 also participates as a scaffold in several other signaling pathways, including JNK/MAPK, p53, and TGF-β, contributing to apoptosis, developmental patterning (notably embryonic axis formation), immune regulation, and antiviral responses[2][4][5]. Mutations or dysregulation of AXIN1, particularly loss-of-function or truncating mutations, are associated with several human cancers, especially in the liver and gastrointestinal tract[1][7]. AXIN1 is itself regulated via post-translational modifications (e.g., poly(ADP-ribosyl)ation by tankyrase, affecting its degradation), and it is the target of small-molecule drugs (e.g., tankyrase inhibitors) that stabilize AXIN1 to inhibit pro-oncogenic β-catenin signaling[1][2]. As a multifunctional scaffold protein rather than a classic receptor or enzyme, AXIN1 is a complex but promising cancer therapeutic target, particularly in tumors dependent on Wnt signaling.

Other names

Axin-1AXINhAxinPPP1R49protein phosphatase 1 regulatory subunit 49CMDOHaxis inhibition protein 1axis inhibitor 1fused, mouse homolog ofaxin-1[1][7]

Stabilization of Axin1 by tankyrase inhibitors (prevents its degradation, enhances β-catenin destruction complex activity) Inhibition of tankyrase-mediated poly(ADP-ribosyl)ation (leading to reduced Axin1 degradation, decreased Wnt/β-catenin signaling)[2][3]