Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+
Maquart FX, Pickart L, Laurent M, Gillery P, Monboisse JC, Borel JP
FEBS Letters (1988)
The foundational mechanistic primary: GHK-Cu stimulated fibroblast collagen synthesis with peak activity at 10⁻⁹ M, independent of any change in cell number — and the GHK triplet sequence exists inside the alpha-2(I) collagen chain itself, suggesting GHK is liberated by wound-site proteases to drive in-situ repair.
This is the foundational mechanistic primary paper for the entire GHK-Cu collagen-stimulation literature — the small-but-load-bearing 1988 FEBS Letters report from the Maquart/Pickart collaboration that established the dose-response curve and proposed the wound-site liberation mechanism. The investigators applied GHK-Cu to cultured fibroblasts and measured collagen synthesis as a function of concentration.
The numerical findings define the canonical GHK-Cu dose-response: stimulation began between 10⁻¹² and 10⁻¹¹ M, maximized at 10⁻⁹ M (i.e., nanomolar), and was independent of any change in cell number. The independence from cell-number changes is methodologically important — it rules out the alternative explanation that GHK-Cu was simply driving fibroblast proliferation and that collagen output rose passively with cell count. The stimulation is a true per-cell effect on collagen biosynthesis.
The discussion offers the mechanistic hypothesis that has carried the field for forty years: a GHK triplet (glycyl-histidyl-lysine) sequence exists within the alpha-2(I) chain of type I collagen itself. The authors propose that during wound injury, tissue proteases cleave type I collagen and liberate GHK at the injury site, where it locally upregulates collagen biosynthesis to drive matrix reconstruction. GHK-Cu would thus function as an endogenous wound-repair signaling tripeptide, with the copper chelation supplying the redox-active metal cofactor required for several collagen-processing enzymes including lysyl oxidase.
This is a 1988 in vitro fibroblast-culture paper — the abstract reports a clean dose-response in cultured cells, not a wound-healing outcome in animal or human tissue. The cell-line used is not specified in the abstract; readers seeking to evaluate generalizability should consult the full paper. The proposed wound-site liberation mechanism is a hypothesis consistent with the alpha-2(I) sequence containment of GHK, but the direct in-vivo demonstration that wound-site proteases generate GHK in proportion to repair activity is more often cited than rigorously documented.
The nanomolar peak-activity concentration is widely quoted; readers should note that topical GHK-Cu cosmetic formulations deliver concentrations orders of magnitude above this peak, which is mechanistically interesting (does saturation reverse the effect? does sustained high concentration shift the gene-expression signature?) but is not addressed in this paper. The full-text discussion includes additional matrix-effects detail beyond collagen that is not captured in the abstract — readers building downstream claims should consult the full paper rather than relying on the abstract alone.
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