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Real-time fluorescence monitoring of phenothiazinium photosensitizers and their anti-mycobacterial photodynamic activity against Mycobacterium bovis BCG in in vitro and in vivo models of localized infection

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Abstract

An objective was to explore the photodynamic activity of two cationic photosensitizers (PS) (benzo[a]phenothiazinium chloride and benzo[a]phenoselenazinium chloride) against Mycobacterium bovis BCG both in vitro and in a murine model of BCG-granuloma. The hypothesis being tested in this study was that cationic molecules could best interact with the negatively charged membrane of BCG as a model for mycobacterial infection. Cells in culture were incubated with various concentrations of PS and subsequently illuminated using a 635 nm diode laser. Dark- and light-induced killing profiles were generated as a function of fluence and dye concentration. In vivo, local injection of the PS into subcutaneous Mycobacterium-induced granuloma sites in murine model was followed by red light illumination of the same area. A special microscope was fabricated for real-time in vivo fluorescent microscopy to monitor EtNBS delivery to subcutaneous murine granulomata. Both PS demonstrated good in vitro antimycobacterial photodynamic activity with varying degrees of toxicity under dark conditions. Real time in vivo monitoring of benzophenothiazine chloride in the mouse model indicated that this fluorescent photosensitizer was delivered rapidly to the subcutaneous granuloma site. In vivo, photosensitizer specific dark- and photo-toxicities depended on the structure, concentration of the photosensitizer and the light dose utilized. Cationic phenothiazine photosensitizers are promising candidates for use in anti-mycobacterial PDT for localized diseases such as cutaneous and pulmonary granulomata.

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Authors and Affiliations

  1. Wellman Centre for Photomedicine, Massachusetts General Hospital, Department of Dermatology, Harvard Medical School, Boston, MA, 02114, USA

    Katie O’Riordan, Oleg E. Akilov, Sung K. Chang & Tayyaba Hasan

  2. Department of Dermatology, Harvard Medical School, Boston, MA, USA

    Katie O’Riordan, Oleg E. Akilov, Sung K. Chang & Tayyaba Hasan

  3. The Rowland Institute at Harvard, Harvard University, Cambridge, MA, USA

    James W. Foley

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  1. Katie O’Riordan
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  2. Oleg E. Akilov
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  3. Sung K. Chang
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  4. James W. Foley
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  5. Tayyaba Hasan
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Correspondence to Tayyaba Hasan.

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O’Riordan, K., Akilov, O.E., Chang, S.K. et al. Real-time fluorescence monitoring of phenothiazinium photosensitizers and their anti-mycobacterial photodynamic activity against Mycobacterium bovis BCG in in vitro and in vivo models of localized infection. Photochem Photobiol Sci 6, 1117–1123 (2007). https://doi.org/10.1039/b707962a

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