Dermal Matrix Investigation
Metal-Peptide Coordination
Evidence: Supported Classification
Preclinical Focus
GHK-Cu / Copper Tripeptide-1
Transition Metal Ligand Complex
Molecular Identity
Apo-GHK is a tripeptide ligand that coordinates with copper to form the GHK-Cu complex. Nonclinical models examine this complex's role in extracellular matrix homeostasis, copper bioavailability, cellular migration, and transcriptional modulation. Observations in dermal biology remain primary research focal points.
Complex Names
GHK-Cu / Cu-GHK
Aliases / Common Names
Copper Tripeptide-1; Cu-GHK; historical: "Pre-collagen Factor"
Complex Identity
Copper-coordinated tripeptide (GHK-Cu)
Apo Peptide CAS Number
49557-75-7 (GHK / glycyl-L-histidyl-L-lysine)
Apo Peptide Molecular Formula
C14H24N6O4
Apo Peptide Molecular Weight
approximately 340.38 g/mol
Sequence
Gly-His-Lys
Coordination Chemistry
GHK coordinates Cu(II) through multiple donor atoms within the tripeptide ligand. The exact coordination environment depends on protonation state, pH, competing ligands, and experimental conditions.
Complex Formula
C14H24CuN6O4 (net Cu-GHK complex; excludes specific salts, hydrates, and counterions)
Complex Molecular Weight
approximately 403.92 g/mol (net Cu-GHK complex; formulated materials may differ)
Technical Note
Distinction must be maintained between the apo-peptide (GHK) and the metal-complexed GHK-Cu.
Model Observation
Mechanistic inquiry focuses on GHK-Cu as a potential copper-transport carrier within the extracellular matrix. Preclinical models explore how this coordination complex interacts with collagen-associated transcription and local enzymatic activity in investigative wound-repair environments.
ECM Modeling
In vitro evaluation of collagen type I and elastin transcriptional responses in fibroblasts.
Redox Signaling
Investigated as a high-affinity carrier for facilitating localized copper ion bioavailability.
Data Segments
Nonclinical Dermal Research
In-vitro experimental data examining extracellular-matrix protein responses in fibroblast cultures.
Transcriptional Observations
Analysis of gene-level upregulation related to structural proteins.
Enzymatic Profile
Preliminary data regarding metalloproteinase modulation and signaling.
Copper Coordination Study
Published or model-derived assessments of Cu2+ transport and local bioavailability.
Dermatologic/Cosmetic Observations
Human cosmetic application data regarding surface texture and skin appearance.
Transcriptome Profiling
Computational interpretation of reported gene-expression datasets and pathway associations.
Evidence Status: Human Cosmetic Evidence
Evidence Classification: Human Cosmetic Evidence is Preliminary / Supported for selected localized outcomes; Mechanistic for systemic gene expression; Preliminary for structural repair models. Limited human cosmetic studies have evaluated topical GHK-Cu-containing products. Some localized skin outcomes and patient-reported measures have shown favorable findings, while other objective outcomes have not demonstrated significant differences. The human evidence base remains small and formulation-dependent, and observed effects cannot be attributed solely to isolated GHK-Cu when combination products or procedures are involved.
Analytical Validation Methods
Accurate nonclinical documentation requires differentiation between mass values assigned to the apo-peptide GHK and the complexed GHK-Cu. Researchers should account for hydration states, stoichiometric metal ratios, and counter-ion presence (such as acetate or TFA). Characterization of the net peptide content versus the total powder mass is essential for interpreting analytical reports; copper coordination may alter peptide stability and biological behavior, but the magnitude and relevance are dependent on the experimental system.
GHK-Cu is commonly described as a 1:1 copper-to-ligand complex, while coordination behavior can vary with pH, protonation state, concentration, competing ligands, and experimental conditions.
Coordination Chemistry
Chemical Stability
GHK-Cu coordination and chemical stability can be influenced by pH, ionic environment, competing chelators, oxidation conditions, formulation composition, and storage conditions. Evidence from one physical state or formulation should not be assumed to establish stability in another. Where formulation-specific solution-stability data are unavailable, this is classified as an Evidence Gap.
âš
Preclinical Note
GHK-Cu is documented for its biochemical relevance in nonclinical research regarding extracellular matrix environments. This information is intended for research documentation and evidence classification purposes only. Alford Molecular Research does not produce materials for human consumption or therapeutic use. Statements regarding molecular signaling are based on in vitro, modeled, or preclinical observations and do not constitute claims of clinical efficacy.