Liposome Encapsulation of the Palmitoyl-KTTKS Peptide: Structural and Functional Characterization

Area of Science:

• Biochemistry
• Materials Science
• Dermatology

Background:

• The N-palmitoyl-KTTKS peptide is a promising anti-aging ingredient.
• Improving peptide stability and skin delivery is crucial for its efficacy.
• Phospholipid-based liposomes offer a potential delivery vehicle.

Purpose of the Study:

• To synthesize and characterize liposomes encapsulating the N-palmitoyl-KTTKS peptide.
• To evaluate the efficacy of peptide-loaded liposomes in stimulating collagen and extracellular matrix (ECM) synthesis.
• To compare the efficacy of liposome-delivered peptide with free peptide and ascorbic acid.

Main Methods:

• Two liposome preparation methods were employed: thin-film evaporation (TLE) and reverse-phase evaporation (REV).
• Liposome characteristics including particle size, polydispersity index (PdI), surface charge, and phospholipid structure were analyzed.
• In vitro experiments were conducted on 3T3-NIH fibroblasts to assess collagen and ECM synthesis.

Main Results:

• Both REV and TLE methods yielded homogeneous liposome dispersions with desirable physicochemical properties (<100 nm or <200 nm hydrodynamic diameter, PdI < 0.20, negative surface charge, >90% structured phospholipids).
• Liposome encapsulation improved the stability and delivery of the N-palmitoyl-KTTKS peptide.
• Peptide-loaded liposomes significantly stimulated collagen production in fibroblasts, outperforming free peptide and ascorbic acid.

Conclusions:

• Phosphatidylcholine (PC) liposomes are effective carriers for the N-palmitoyl-KTTKS peptide.
• Liposomal delivery enhances the biological activity of the peptide in promoting collagen synthesis.
• This formulation holds potential for cosmetic and dermatological applications targeting skin regeneration.