GHK-Cu Copper Peptides: Skin Biology and Tissue Remodeling Research
Investigating GHK-Cu — the copper-binding tripeptide that modulates extracellular matrix remodeling, collagen synthesis, and antioxidant defense in tissue biology research.
GHK-Cu: A Naturally Occurring Copper Complex
Glycyl-L-histidyl-L-lysine (GHK) is a tripeptide with extraordinarily high affinity for copper(II) ions. It was first isolated from human plasma in 1973 and has since been identified as a key regulator of tissue remodeling and wound healing. GHK-Cu represents the copper-bound form (GHK:Cu²⁺ at 1:1 stoichiometry).
Copper Coordination Chemistry
The GHK peptide coordinates copper through its N-terminal glycine amine nitrogen, histidine imidazole nitrogen, and peptide backbone amide nitrogens. This coordination geometry creates a square-planar complex that is highly stable (Kd ~10⁻¹⁶ M) yet bioavailable. The complex facilitates copper delivery into cells through the copper transporter 1 (CTR1) protein, while protecting against Fenton chemistry.
Biological Activities
Extracellular Matrix Remodeling
GHK-Cu modulates the balance between matrix synthesis and degradation: upregulating collagen gene expression in fibroblasts, modulating MMP/TIMP balance, promoting glycosaminoglycan synthesis, and stimulating tropoelastin production.
Chemotaxis and Angiogenesis
GHK-Cu acts as a chemoattractant for macrophages, monocytes, mast cells, and capillary endothelial cells. It also stimulates VEGF and bFGF expression and enhances endothelial cell tube formation at physiologically relevant concentrations (1-10 nM).
Antioxidant Activity and Gene Expression
The copper coordination complex has superoxide dismutase (SOD)-like activity, scavenging superoxide radicals and attenuating lipid peroxidation. Genome-wide studies have identified hundreds of genes modulated by GHK-Cu, with effects most pronounced in collagen and ECM gene families, inflammatory cytokine pathways, apoptosis regulatory genes, and iron metabolism genes.
AHK-Cu: A Modified Copper Peptide
AHK-Cu substitutes the C-terminal lysine with another amino acid, altering the copper coordination environment and producing a different profile of biological activities. This demonstrates how small changes in peptide sequence can tune copper peptide function.
Research Applications
Fibroblast culture models for collagen synthesis and MMP/TIMP profiling, endothelial cell tube formation and migration assays, 3D skin equivalents for ECM organization, and transcriptomic analysis of GHK-Cu-responsive gene networks.
Malice Research Lab offers GHK-Cu (CU50, CU100) and AHK-Cu (ACU50) with verified purity.