GHK-Cu in a flaxseed gum hydrogel fully healed experimental cutting wounds in rats.

Effective wound healing, especially for extensive skin damage, remains a significant clinical challenge. While many materials exist, optimizing the delivery of bioactive agents to the wound site is crucial for accelerating repair. Traditional dressings may not provide a sustained release of therapeutic compounds. Bioactive peptides like GHK-Cu (glycyl-l-histidyl-l-lysine) are known to accelerate wound healing and skin repair, but their efficacy is highly dependent on the delivery vehicle. This study explores novel hydrogels based on natural polysaccharides (low-methoxyl amidated citrus pectin and flaxseed gum) as matrices for delivering GHK-Cu and α-l-arginine, aiming to create a more effective, sustained-release system to improve healing outcomes compared to simple aqueous solutions.

Researchers created two types of hydrogels, one from low-methoxyl amidated citrus pectin (LMA) and another from flaxseed gum, to serve as delivery vehicles for healing agents. These hydrogels were loaded with either tripeptide GHK-Cu, α-l-arginine, or a combination of both. The study used an in vivo animal model with rats that had experimental cutting wounds with extensive skin damage. The hydrogel formulations were applied to the wounds. Control groups included untreated animals and animals treated with an aqueous solution of GHK-Cu. The primary endpoint was the rate and quality of wound healing, assessed visually and through histological analysis.

Both polysaccharide hydrogels improved the healing process when carrying GHK-Cu and/or arginine compared to controls. The flaxseed gum hydrogel demonstrated zero-order release kinetics, which is considered optimal for drug delivery, while the pectin hydrogel released the drugs very slowly due to strong binding between the cationic tripeptide and the pectin's carboxylic groups. Treatment with GHK-Cu in either hydrogel resulted in a significantly higher healing degree and lower healing time compared to untreated controls or GHK-Cu applied in a simple aqueous solution. While a combination of GHK-Cu and α-l-arginine was also effective, no synergistic effect was observed.

According to histological analysis, complete healing was achieved only when using the tripeptide GHK-Cu in the flaxseed gum hydrogel. This specific formulation proved to be the most effective combination for facilitating comprehensive tissue repair in the rat model.

Written by TitrateLab, separately from the study summarized above.