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      1. Author :
        Tanaka, M.; Mroz, P.; Dai, T.; Huang, L.; Morimoto, Y.; Kinoshita, M.; Yoshihara, Y.; Shinomiya, N.; Seki, S.; Nemoto, K.; Hamblin, M. R.
      2. Title :
      3. Type :
        Journal Article
      4. Year :
      5. Publication :
        Photochem Photobiol
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      10. Research Area :
      11. Keywords :
        Xen31, Xen 31, MRSA, S. aureus, IVIS, Bioluminescence
      12. Abstract :
        We previously reported that photodynamic therapy (PDT) using intra-articular methylene blue (MB) could be used to treat arthritis in mice caused by bioluminescent methicillin-resistant Staphylococcus aureus (MRSA) either in a therapeutic or in a preventative mode. PDT accumulated neutrophils into the mouse knee via activation of chemoattractants such as inflammatory cytokines or chemokines. In the present study, we asked whether PDT combined with antibiotics used for MRSA could provide added benefit in controlling the infection. We compared MB-PDT alone, systemic administration of either linezolid (LZD) alone or vancomycin (VCM) alone or the combination of PDT with either LZD or VCM. Real-time non-invasive imaging was used to serially follow the progress of the infection. PDT alone was the most effective, while LZD alone was ineffective and VCM alone showed some benefit. Surprisingly the addition of LZD or VCM reduced the therapeutic effect of PDT alone (P<0.05). Considering that PDT in this mouse model stimulates neutrophils to be antibacterial rather than actively killing the bacteria, we propose that LZD and VCM might inhibit the activation of inflammatory cytokines without eradicating the bacteria, and thereby reduce the therapeutic effect of PDT. (c) 2013 Wiley Periodicals, Inc. Photochemistry and Photobiology (c) 2013 The American Society of Photobiology.
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      14. Call Number :
        PKI @ kd.modi @ 6
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