Contribution of antimicrobial photo-sonodynamic therapy in wound healing: an in vivo effect of curcumin-nisin-based poly (L-lactic acid) nanoparticle on Acinetobacter baumannii biofilms

Maryam Pourhajibagher,Abbas Bahador,Babak Pourakbari

doi:10.1186/s12866-022-02438-9

Maryam Pourhajibagher, Abbas Bahador + Show 1 more

Open Access

https://doi.org/10.1186/s12866-022-02438-9

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Abstract

BackgroundThe biofilm-forming ability of Acinetobacter baumannii in the burn wound is clinically problematic due to the development of antibiotic-resistant characteristics, leading to new approaches for treatment being needed. In this study, antimicrobial photo-sonodynamic therapy (aPSDT) was used to assess the anti-biofilm efficacy and wound healing activity in mice with established A. baumannii infections.MethodsFollowing synthesis and confirmation of Curcumin-Nisin-based poly (L-lactic acid) nanoparticle (CurNisNp), its cytotoxic and release times were evaluated. After determination of the sub-significant reduction (SSR) doses of CurNisNp, irradiation time of light, and ultrasound intensity against A. baumannii, anti-biofilm activity and the intracellular reactive oxygen species (ROS) generation were evaluated. The antibacterial and anti-virulence effects, as well as, histopathological examination of the burn wound sites of treated mice by CurNisNp-mediated aPSDTSSR were assessed and compared with silver sulfadiazine (SSD) as the standard treatment group.ResultsThe results showed that non-cytotoxic CurNisNp has a homogeneous surface and a sphere-shaped vesicle with continuous release until the 14th day. The dose-dependent reduction in cell viability of A. baumannii was achieved by increasing the concentrations of CurNisNp, irradiation time of light, and ultrasound intensity. There was a time-dependent reduction in biofilm growth, changes in gene expression, and promotion in wound healing by the acceleration of skin re-epithelialization in mice. Not only there was no significant difference between aPSDTSSR and SSD groups in antibacterial and anti-virulence activities, but also wound healing and re-epithelialization occurred more efficiently in aPSDTSSR than in the SSD group.ConclusionsIn conclusion, CurNisNp-mediated aPSDT might be a promising complementary approach to treat burn wound infections.

Highlights

The biofilm-forming ability of Acinetobacter baumannii in the burn wound is clinically problematic due to the development of antibiotic-resistant characteristics, leading to new approaches for treatment being needed
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In vitro drug release Standard plot obtained from UV-absorbance analysis of free Cur-Nis was used to estimate from the release kinetics of CurNis-entrapped nanoparticle

Summary

Introduction

The biofilm-forming ability of Acinetobacter baumannii in the burn wound is clinically problematic due to the development of antibiotic-resistant characteristics, leading to new approaches for treatment being needed. Burn wound infection is one of the common and serious healthcare problems [1] Many factors such as type, amount of the microbial burden colonizing in burn. Acinetobacter baumannii is an important opportunistic bacterium capable of developing a wide range of infections in burn wounds [4]. It emerged as the common and invasive bacteria under its robust antibacterial resistance and virulence factor. A key challenge is to find new non-antibiotic therapies to eliminate A. baumannii from colonizing in burn wounds

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