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Quaternized Zn(II) phthalocyanines for photodynamic strategy against resistant periodontal bacteria

  • Vesselin Kussovski , Vanya Mantareva EMAIL logo , Mahmut Durmuş and Ivan Angelov
Published/Copyright: January 8, 2018

Abstract

Photodynamic inactivation (PDI) has been featured as an effective strategy in the treatment of acute drug-resistant infections. The efficiency of PDI was evaluated against three periodontal pathogenic bacteria that were tested as drug-resistant strains. In vitro studies were performed with four water-soluble cationic Zn(II) phthalocyanines (ZnPc1–4) and irradiation of a specific light source (light-emitting diode, 665 nm) with three doses (15, 36 and 60 J/cm2). The well detectable fluorescence of ZnPcs allowed the cellular imaging, which suggested relatively high uptakes of ZnPcs into bacterial species. Complete photoinactivation was achieved with all studied ZnPc1–4 for Enterococcus faecalis (E. faecalis) at a light dose of 15 J/cm2. The photodynamic response was high for Prevotella intermedia (P. intermedia) after the application of 6 μM of ZnPc1 and a light dose of 36 J/cm2 and for 6 μM of ZnPc2 at 60 J/cm2. P. intermedia was inactivated with ZnPc3 (4 log) and ZnPc4 (2 log) with irradiation at an optimal dose of 60 J/cm2. Similar photoinactivation results (2 log) were achieved for Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans) treated with 6 μM ZnPc1 and ZnPc2 at a light dose of 60 J/cm2. The study suggested that PDI with quaternized Zn(II) phthalocyanines and specific light irradiation appears to be a very useful antimicrobial strategy for effective inactivation of drug-resistant periodontal pathogens.

Acknowledgments

The authors thank Prof. Slavcho Dimitrov, MD, for discussions. The support made by the National Science Fund (Funder Id: 10.13039/501100003336, grants DO-02-177/08 and B02/9/2014).

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Received: 2017-09-14
Revised: 2017-11-08
Accepted: 2017-11-30
Published Online: 2018-01-08
Published in Print: 2018-04-25

©2018 Walter de Gruyter GmbH, Berlin/Boston

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