Dual role of iodine, silver, chlorhexidine and octenidine as antimicrobial and antiprotease agents
Vojtěch Pavlík, Martin Sojka, Mária Mazúrová, Vladimír Velebný, Vojtěch Pavlík, Martin Sojka, Mária Mazúrová, Vladimír Velebný
Abstract
Objectives: The majority of human chronic wounds contain bacterial biofilms, which produce proteases and retard the resolution of inflammation. This in turn leads to elevated patient protease activity. Chronic wounds progressing towards closure show a reduction in proteolytic degradation. Therefore, the modulation of protease activity may lead to the faster healing of chronic wounds. Antimicrobials are used to control biofilm-based infection; however, some of them also exhibit the inhibition of matrix metalloproteinases and bacterial proteases. We investigated the antimicrobial agents used in wound healing for their potential to inhibit bacterial and host proteases relevant to chronic wounds.
Methods: Using in vitro zymography, we tested the ability of povidone-iodine, silver lactate, chlorhexidine digluconate, and octenidine hydrochloride to inhibit selected human proteases and proteases from Pseudomonas aeruginosa, Staphylococcus aureus, Serratia marcescens, and Serratia liquefaciens. We investigated penetration and skin protease inhibition by means of in situ zymography.
Results: All the tested antimicrobials inhibited both eukaryotic and prokaryotic proteases in a dose-dependent manner in vitro. The tested compounds were also able to penetrate into skin ex vivo and inhibit the resident proteases. Silver lactate and chlorhexidine digluconate showed an inhibitory effect ex vivo even in partial contact with skin in Franz diffusion cells.
Conclusions: Our in vitro and ex vivo results suggest that wound healing devices which contain iodine, silver, chlorhexidine, and octenidine may add value to the antibacterial effect and also aid in chronic wound healing. Antiprotease effects should be considered in the design of future antimicrobial wound healing devices.
Conflict of interest statement
We declare that VP, MS, MM and VV were employed during the study by a commercial company Contipro that manufactures wound healing products with antimicrobials iodine and octenidine hydrochloride. None of the products was evaluated in the presented study. This does not alter our adherence to PLOS ONE.
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