CXXC-type zinc finger protein 5 (CXXC5) (CXXC5)

CXXC-type zinc finger protein 5 (CXXC5) is a negative regulator of the Wnt/beta-catenin signaling pathway that functions by binding to the Dishevelled (Dvl) protein. Specifically, the C-terminal region of CXXC5 interacts with the PDZ domain of Dvl, preventing the downstream activation of Wnt signaling which is essential for stem cell differentiation and tissue regeneration (Kim et al., 2015, Nature Communications). In conditions such as androgenetic alopecia and osteoporosis, CXXC5 is often overexpressed, leading to suppressed Wnt signaling and impaired hair growth or bone formation (Lee et al., 2017, Journal of Investigative Dermatology). Therapeutic strategies focus on disrupting this protein-protein interaction (PPI) using competitive inhibitors like the PTD-DBM peptide or small molecules like KY19382. By blocking the CXXC5-Dvl interface, these agents restore Wnt/beta-catenin signaling, thereby promoting hair follicle regeneration, accelerating wound healing, and enhancing osteoblast differentiation (Kim et al., 2021, Journal of Medicinal Chemistry). This target is particularly significant in regenerative medicine as it allows for the modulation of a major signaling pathway through a specific protein interface rather than global receptor activation.

Other names

CXXC finger protein 5Retinoid-inducible nuclear proteinRGRWIDWnt-inhibiting factor 1-like

Inhibition of the protein-protein interaction (PPI) between the C-terminal domain of CXXC5 and the PDZ domain of Dishevelled (Dvl) to restore and activate the Wnt/beta-catenin signaling pathway.