Ionic liquid-conjugated Pentapeptide-4 (IL-KTTKS) exhibits triple antimicrobial, antifungal, and collagenesis-inducing activity

Chronic wound infections pose a significant challenge, particularly in conditions like diabetes and peripheral vascular diseases, leading to high morbidity and mortality. These non-healing wounds are often complicated by multidrug-resistant (MDR) bacterial pathogens, including the critical 'ESKAPE' group, which evade standard antibiotic treatments. Current therapies frequently fail to address both the infection and the impaired tissue regeneration. Pentapeptide-4 (PP4, KTTKS), known as Matrixyl in its N-palmitoyl form, is a recognized cosmeceutical for its collagenesis-inducing properties, but lacks direct antimicrobial action. There is a critical need for agents that can simultaneously combat resistant infections and promote wound healing.

Researchers synthesized novel ionic liquid/Pentapeptide-4 (IL-KTTKS) conjugates by coupling imidazolium-based ionic liquids to the KTTKS peptide sequence. These conjugates were then evaluated in vitro for their antimicrobial efficacy against a panel of both antibiotic-susceptible and multidrug-resistant clinical isolates of Gram-positive and Gram-negative bacterial species, specifically focusing on ESKAPE pathogens. Antifungal activity was also assessed. The antibacterial activity of IL-KTTKS was further tested in simulated wound fluid to mimic physiological conditions. Additionally, the collagenesis-inducing effects of the conjugates were measured in vitro and compared directly to those of the well-known cosmeceutical, Matrixyl.

The newly developed IL-KTTKS conjugates demonstrated potent antimicrobial activity across a broad spectrum. They were effective against both antibiotic-susceptible strains and multidrug-resistant clinical isolates of Gram-positive and Gram-negative bacteria, including the challenging ESKAPE group of pathogens. A crucial finding was that their antibacterial activity remained preserved in simulated wound fluid, suggesting potential efficacy in a real wound environment. Beyond their antibacterial properties, the conjugates also exhibited significant antifungal activity in vitro. Importantly, their capacity to induce collagenesis in vitro was found to be comparable to, or even stronger than, that of the established cosmeceutical Matrixyl. This indicates a dual benefit for wound healing. > Altogether, IL-KTTKS conjugates exert a triple action: potent antibacterial, antifungal, and collagenesis-inducing effects in vitro, offering a comprehensive approach to complicated wound management.