The Scorpion Peptide Derivative HP-H1K8 is a Promising Topical Agent Against Methicillin-Resistant Staphylococcus Aureus.

The increasing incidence of antibiotic-resistant Staphylococcus aureus infections has created a critical need for alternative therapeutic agents that are effective and safe. Antimicrobial peptides are considered attractive candidates in this context. A scorpion peptide derivative, designated HP-H1K8, was designed in this study and was then found to possess potent activity against methicillin-resistant S. aureus (MRSA), coupled with low toxicity and high serum stability. The mechanism of action was identified as bacterial membrane disruption. In a mouse model of MRSA-induced skin infection, the topical application of HP-H1K8 was shown to significantly reduce bacterial load in the wound and enhance the healing process. Additionally, the peptide was not prone to inducing bacterial resistance. It is concluded that HP-H1K8 represents a potent topical agent for the treatment of skin infections caused by drug-resistant S. aureus.