PTD-DBM

PTD-DBM is a cell-penetrating peptide construct designed to activate the Wnt/beta-catenin signaling pathway by disrupting the interaction between CXXC5 and Dishevelled (Dvl) proteins. The peptide consists of a protein transduction domain (PTD) fused to a Dishevelled-binding motif (DBM) derived from the CXXC5 protein. CXXC5 normally functions as a negative feedback regulator of the Wnt pathway by binding to Dvl and preventing downstream beta-catenin signaling. PTD-DBM competitively inhibits this interaction, thereby releasing the brake on Wnt signaling in preclinical systems.

Research published by Kim and colleagues at Yonsei University demonstrated PTD-DBM activity in hair-follicle neogenesis research models in mice. Topical application of PTD-DBM in research models activated Wnt/beta-catenin signaling in hair-follicle dermal papilla cells, leading to new hair-follicle formation markers and increased hair-growth readouts. The peptide was shown to stimulate the proliferation and migration of dermal papilla cells in cell-culture models and to promote the transition of hair follicles from the telogen (resting) phase to the anagen (growth) phase in research models.

The Wnt/beta-catenin pathway plays critical roles in hair-follicle development, stem-cell maintenance, and in-vitro wound-assay research. PTD-DBM's mechanism of activating this pathway through disruption of the CXXC5-Dvl protein-protein interaction represents a targeted approach to pathway modulation. Additional research has explored the peptide's activity in bone-formation and in-vitro wound-assay research models where Wnt signaling is involved in tissue-regeneration research models.