RESUMEN
A single step immobilization-polymerization strategy of a highly active antimicrobial peptide into a soft hydrogel network on a poly(ethylene terephthalate) surface using thiol-ene chemistry is described. The bactericidal hydrogel was molecularly characterized via Coomassie and Lowry assay protein staining agents as well as by X-ray photoelectron spectroscopy. The bactericidal activity was established against Staphylococcus aureus and Staphylococcus epidermidis, two bacterial strains commonly associated with biomaterial infections. To gain further insight into the biological stability, the hydrogels were incubated with human serum prior to activity testing without loss of activity. These studies revealed a promising bactericidal hydrogel with good stability under physiological conditions.
Asunto(s)
Antiinfecciosos , Péptidos Catiónicos Antimicrobianos , Hidrogeles , Polietilenglicoles , Staphylococcus aureus/crecimiento & desarrollo , Staphylococcus epidermidis/crecimiento & desarrollo , Antiinfecciosos/síntesis química , Antiinfecciosos/química , Antiinfecciosos/farmacología , Péptidos Catiónicos Antimicrobianos/síntesis química , Péptidos Catiónicos Antimicrobianos/química , Péptidos Catiónicos Antimicrobianos/farmacología , Humanos , Hidrogeles/síntesis química , Hidrogeles/química , Hidrogeles/farmacología , Polietilenglicoles/síntesis química , Polietilenglicoles/química , Polietilenglicoles/farmacologíaRESUMEN
This report describes the design and synthesis of a bactericidal poly(ethylene glycol)-based (PEG) hydrogel coating with covalently attached antimicrobial peptides (AMP) stabilized against proteolytic degradation. As such, mimics of the highly active AMP HHC10 (H-KRWWKWIRW-NH2) were designed for optimal stability in human serum while retaining strong antimicrobial activity against Staphylococcus aureus and Staphylococcus epidermidis, the major causative agents of biomaterial associated infection. In order to investigate the selectivity of the AMPs, their hemolytic activity was determined. A N-terminal cysteine facilitated thiol-ene chemistry for a fast, single-step immobilization/photopolymerization strategy. The antimicrobial activity of the resulting thin layer hydrogel coating on a PET surface was established using the Japanese Industrial Standard (JIS) Z2801 assay, showing complete killing (>99.9%) of inocula of S. aureus ATCC 49230, S. epidermidis ATCC 35984, and E. coli ATCC 8739.