Nanoengineered Self-Assembling Peptides with Increased Proteolytic Stability Promote Wound Healing.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Peptide Chemistry

Background:

• The copper complex of glycine-histidine-lysine (GHK) shows promise for wound healing and tissue remodeling.
• Proteolytic cleavage in body fluids limits the in vivo activity of GHK.
• Self-assembling peptide nanostructures offer a strategy to enhance peptide stability and delivery.

Purpose of the Study:

• To design and synthesize self-assembling peptide nanostructures incorporating the GHK sequence.
• To evaluate the stability, bioactivity, and wound healing efficacy of these nanostructures.
• To investigate the mechanism of action by analyzing the secretion of key healing regulators.

Main Methods:

• Design of phenylalanine (F) backbone peptides for self-assembly.
• Coassembly of F4D with GHK and covalent conjugation of GHK to F4D (F4D-GHK, F4D-KHG).
• Characterization of nanostructure formation (nanotapes) and proteolytic stability.
• In vitro wound healing assays and multiplex immunoassay analysis of secreted factors.

Main Results:

• All tested peptides self-assembled into nanotapes.
• Covalently bound peptide assemblies (F4D-GHK, F4D-KHG) exhibited enhanced resistance to proteolytic degradation.
• Supramolecular structures demonstrated superior wound healing bioactivity compared to GHK alone.
• Enhanced secretion of cytokines, matrix metalloproteinases, and growth factors was observed.

Conclusions:

• Incorporating GHK into self-assembling supramolecular structures significantly improves its stability and bioactivity.
• These peptide nanostructures represent a promising platform for enhanced wound healing therapies.
• The improved efficacy is linked to enhanced stability and modulation of key wound healing signaling pathways.