In vivo stimulation of connective tissue accumulation by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ in rat experimental wounds.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model without human clinical data
PubMed 8227353 · doi:10.1172/JCI116842
What was done
Stainless steel wire mesh cylinders were implanted subcutaneously in rats as a wound chamber model. Rats received sequential injections into the chambers of either saline, a control tripeptide (L-glutamyl-L-histidyl-L-proline), or various concentrations of the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ (GHK-Cu). Wound chambers were subsequently collected and analyzed for dry weight, total proteins, collagen, DNA, elastin, glycosaminoglycans, and specific mRNAs for collagens (type I and III) and TGF-beta.
What was found
The abstract reports no absolute numerical values or variances. In GHK-Cu-treated wound chambers, there was a concentration-dependent increase in dry weight, DNA, total protein, collagen, and glycosaminoglycan contents. Stimulation of collagen synthesis was reported to be twice that of noncollagen proteins. Type I and III collagen mRNAs and relative dermatan sulfate levels were increased, while TGF-beta mRNA was not. The control tripeptide had no significant effect.
Why it matters
This paper demonstrates that GHK-Cu stimulates extracellular matrix and collagen accumulation in vivo in a controlled animal model.
Limits
This is an animal study using subcutaneous chambers in rats, not a clinical trial in humans. The abstract does not report the total sample size (n), specific doses or concentrations tested, or quantitative values with confidence intervals or p-values.
Cited by
- context In animal studies, injecting GHK-Cu at a site distant from a surgical incision accelerates skin wound healing.