PTD-DBM (Hair Loss Peptide)

Overview

PTD-DBM is a synthetic peptide designed to block the interaction between CXXC-type zinc finger protein 5 (CXXC5) and Dishevelled (Dvl) proteins in the Wnt/β-catenin signaling pathway. CXXC5 acts as a negative feedback regulator that suppresses Wnt signaling in hair follicles. By disrupting the CXXC5-Dvl interaction, PTD-DBM reactivates Wnt pathway signaling in dermal papilla cells, promoting hair follicle regeneration and potentially offering a novel therapeutic approach for androgenetic alopecia and other forms of hair loss.

Mechanism of Action

CXXC5 binds to the DIX domain of Dvl (Dishevelled) and recruits the Axin/GSK3β destruction complex, targeting β-catenin for proteasomal degradation and thus suppressing Wnt target gene expression in hair follicle dermal papilla cells. PTD-DBM contains a protein transduction domain (PTD) for membrane penetration and a Dvl-binding motif (DBM) that competes with CXXC5 for Dvl binding. This displacement of CXXC5 frees Dvl to propagate Wnt signaling, stabilizing β-catenin and activating hair follicle stem cell programs including Wnt target genes (AXIN2, LEF1, cyclin D1).

Potential Benefits

• Hair follicle regeneration via Wnt pathway reactivation
• Potential treatment for androgenetic alopecia
• Synergistic hair growth when combined with valproic acid in preclinical models
• Novel mechanism distinct from minoxidil/finasteride

Research Dosage Notes

The following reflects doses used in published research studies. This is not medical advice.

Preclinical topical application. No established human dosing.

Amino Acid Sequence

Side Effects & Safety

• Preclinical only; systemic effects not characterized in humans

Synergistic Compounds

The following compounds have been studied alongside PTD-DBM (Hair Loss Peptide) for potential complementary or synergistic effects:

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References & Further Reading

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