Antimicrobial photodynamic therapy in a mouse model of Acinetobacter baumannii burn infection

Tianhong Dai; George P. Tegos; Zongshun Lu; Timur Zhiyentayev; Liyi Huang; Michael J. Franklin; David G Baer; Michael R. Hamblin

doi:10.1117/12.823065

13 July 2009 Antimicrobial photodynamic therapy in a mouse model of Acinetobacter baumannii burn infection

Tianhong Dai, George P. Tegos, Zongshun Lu, Timur Zhiyentayev, Liyi Huang, Michael J. Franklin, David G Baer, Michael R. Hamblin

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Proceedings Volume 7380, Photodynamic Therapy: Back to the Future; 738037 (2009) https://doi.org/10.1117/12.823065
Event: 12th World Congress of the International Photodynamic Association, 2009, Seattle, Washington, United States

Abstract

Multi-drug resistant Acinetobacter baumanii infections represent a growing problem, especially in traumatic wounds and burns suffered by military personnel injured in Middle Eastern conflicts. Effective treatment using traditional antibiotics can be extremely difficult and new antimicrobial approaches are being investigated. One of these antimicrobial alternatives could be the combination of non-toxic photosensitizers (PS) and visible light known as photodynamic therapy (PDT). We report on the establishment of a new mouse model of full thickness thermal burns infected with a bioluminescent derivative of a clinical Iraqi isolate of A. baumannii and its PDT treatment by topical application of a PS produced by covalent conjugation chlorin(e6) to polyethylenimine followed by illumination of the burn surface with red light. Application of 10⁸ A. baumannii cells to the surface of 10-second burns made on the dorsal surface of shaved female BALB/c mice led to chronic infections that lasted on average 22 days characterized by a remarkably stable bacterial bioluminescence. PDT carried out on day 0 soon after applying bacteria gave over three logs of loss of bacterial luminescence in a light exposure dependent manner, while PDT carried out on day 1 and day 2 gave approximately a 1.7-log reduction. Application of PS dissolved in 10% or 20% DMSO without light gave only modest reduction in bacterial luminescence from mouse burns. Some bacterial regrowth in the treated burn was observed but was generally modest. It was also found that PDT did not lead to inhibition of wound healing. The data suggest that PDT may be an effective new treatment for multi-drug resistant localized A. baumannii infections.

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Tianhong Dai, George P. Tegos, Zongshun Lu, Timur Zhiyentayev, Liyi Huang, Michael J. Franklin, David G Baer, and Michael R. Hamblin "Antimicrobial photodynamic therapy in a mouse model of Acinetobacter baumannii burn infection", Proc. SPIE 7380, Photodynamic Therapy: Back to the Future, 738037 (13 July 2009); https://doi.org/10.1117/12.823065

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KEYWORDS

Photodynamic therapy

Luminescence

Picosecond phenomena

Wound healing

Bacteria

Mouse models

Bioluminescence

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