Mechanism of Action
GHK-Cu is a naturally occurring tripeptide-copper complex first isolated from human plasma, present at concentrations that decline with age. Its primary mechanism involves high-affinity chelation of Cu²⁺ ions forming a stable square-planar coordination complex. Research using gene expression profiling has identified over 4,000 human genes modulated by GHK-Cu, with pronounced effects on ECM synthesis, antioxidant defense, and anti-inflammatory signaling pathways.
At the cellular level, GHK-Cu stimulates fibroblast proliferation and differentiation, upregulating collagen (types I and III), elastin, fibronectin, and decorin through TGF-β pathway activation and suppression of matrix metalloproteinases (MMP-1, MMP-2, MMP-9) via TIMP induction.
GHK-Cu also activates the Nrf2/ARE antioxidant response pathway, upregulating superoxide dismutase, catalase, and glutathione peroxidase. In parallel it suppresses NF-κB, reducing downstream cytokine secretion (TNF-α, IL-1β, IL-6) in stimulated macrophage models.
