Regenerative and protective actions of the GHK-Cu peptide in the light of the new gene data

Comprehensive review by Loren Pickart and Anna Margolina consolidating approximately five decades of research on the GHK (Gly-His-Lys) tripeptide and its copper complex GHK-Cu. The article is frequently cited as a modern reference for any discussion of GHK, GHK-Cu and its cosmetic analogs — including Pal-GHK (palmitoyl tripeptide-1), the lipophilic variant developed for topical use.

The distinctive feature of this work is the integration of Connectivity Map (CMap) data — a database that measures the impact of individual molecules on the human transcriptome at large scale. The analysis revealed that GHK-Cu significantly modulates 31.2% of all human genes at a threshold of ≥50% expression change. This finding provides a molecular explanation for the apparent multifunctionality of the peptide, which goes far beyond collagen stimulation: GHK functions as a broad epigenetic regulator, reprogramming transcriptional patterns.

The review synthesizes GHK-Cu effects across multiple systems: wound healing and extracellular matrix synthesis (stimulation of collagen, elastin and glycosaminoglycans); tissue regeneration (skin, lung, bone, liver, stomach); angiogenesis and neural growth; anti-inflammatory and antioxidant properties; anti-cancer actions (paradoxically, with modulation toward benign phenotype in neoplastic cells); DNA repair; and activation of cellular cleansing via the proteasome system. The authors particularly highlight effects on dermal fibroblasts, with 12.5-fold increase in cell viability in combination with photobiomodulation and 70% stimulation of collagen synthesis.

For the Pal-GHK cosmetic literature, this review provides the modern molecular foundation for clinical effects observed in topical products. Coupling palmitic acid to GHK preserves the central biological mechanism — modulation of gene expression in fibroblasts — while solving the problem of penetration through the stratum corneum. This is an obligatory reference for any work on GHK-based cosmetic peptides and their structural derivatives.