Copper Peptide GHK-Cu
GHK-Cu | Glycyl-L-Histidyl-L-Lysine:Copper(II) | Copper Tripeptide-1 | Linus Pauling Peptide
Mechanism of Action
GHK-Cu is a naturally occurring copper-binding tripeptide first identified in human plasma by Loren Pickart in 1973. It is found in blood, saliva, and urine, with plasma levels declining from about 200 ng/mL at age 20 to 80 ng/mL by age 60. The copper ion is essential for its biological activity, as it enables the peptide to serve as a bioavailable copper delivery system.
GHK-Cu exerts its biological effects through multiple well-characterized mechanisms. It powerfully stimulates collagen synthesis (types I and III), decorin, and glycosaminoglycan production in dermal fibroblasts. Simultaneously, it upregulates matrix metalloproteinases (MMPs) and their inhibitors (TIMPs), enabling coordinated tissue remodeling rather than simple collagen deposition. This remodeling capacity is key to its wound-healing effects — GHK-Cu promotes organized tissue repair rather than scar formation.
Beyond structural matrix effects, GHK-Cu has potent antioxidant activity via SOD and glutathione pathway upregulation, suppresses inflammatory cytokines including TGF-beta and TNF-alpha, and promotes angiogenesis by inducing VEGF and FGF-2 expression. Gene expression studies by Pickart et al. using the Broad Institute Connectivity Map showed GHK can influence the expression of over 4,000 genes, with patterns suggesting suppression of fibrosis-related and inflammation-related gene networks.
Key Research Findings
- Pickart et al. (2012) demonstrated GHK-Cu affects expression of 4,048 human genes, resetting gene expression patterns associated with aggressive fibrosis and tissue destruction toward healthier profiles.
- Leyden et al. (2002) showed topical GHK-Cu cream significantly improved skin laxity, clarity, and reduced fine lines in a 12-week controlled facial study.
- Canapp et al. (2003) found GHK-Cu accelerated wound healing in dogs with open wound management, with significantly faster wound contraction.
- Siméon et al. (2000) demonstrated GHK-Cu stimulates decorin synthesis by fibroblasts, a proteoglycan critical for proper collagen fiber organization.
References
Dosage in Research
Topical studies typically use 1-4% GHK-Cu solutions. In vitro studies use concentrations of 1-10 micromolar. Injectable research protocols are less standardized, with doses varying widely by application.
Storage & Handling
Store lyophilized powder at -20C, protected from light. The copper complex is stable but can oxidize; minimize exposure to air. Reconstituted solution should be refrigerated at 2-8C and used within 30 days.
Frequently Asked Questions
What is GHK-Cu?
GHK-Cu is a naturally occurring copper-binding tripeptide (glycyl-L-histidyl-L-lysine with a copper ion) found in human plasma. Its concentration declines with age, and it has been extensively studied for roles in skin remodeling, wound healing, and gene expression modulation.
Why is the copper ion important?
The copper (II) ion is essential for GHK-Cu's biological activity. It enables the peptide to serve as a bioavailable copper delivery system, and copper is a critical cofactor for enzymes like lysyl oxidase (which crosslinks collagen) and superoxide dismutase (an antioxidant enzyme).
How many genes does GHK-Cu affect?
Broad Institute Connectivity Map analysis by Pickart et al. found GHK influences the expression of over 4,000 human genes, with significant effects on pathways related to tissue remodeling, inflammation suppression, and antioxidant defense.
Source Copper Peptide GHK-Cu for your research
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