Photodynamic Therapy Using Novel Zinc Phthalocyanine Derivatives and a Diode Laser for Superficial Tumors in Experimental Animals

Tohru Obata^1*, Satoru Mori², Yuka Suzuki^1,2, Takuto Kashiwagi¹, Etsuko Tokunaga², Norio Shibata², Motohiro Tanaka¹

¹Department of Bioorganic Chemistry, Faculty of Pharmaceutical Sciences, Aichi-Gakuin University, Nagoya, Japan.
¹Department of Bioorganic Chemistry, Faculty of Pharmaceutical Sciences, Aichi-Gakuin University, Nagoya, Japan.
²Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Japan.

DOI: 10.4236/jct.2015.61008                

Abstract

Photodynamictherapy (PDT) using a photo sensitizing agent and several light sources has been shown to have nonspecific and noninvasive effects on superficial cancers. Phthalocyanine (Pc) derivatives as novel photosensitizers, trifluoroethoxy-coatedzinc Pcconjugated with β-cyclodextrin (βCD-4TFEO-Pc) was synthesized and its photodynamic effect in vitro and in vivo was evaluated. βCD-4TFEO-Pc alone was completely non-cytotoxic even at high concentrations, and showed excellentphotodynamic effects in B16-F10 and HT-1080 celllines. The in vivo antitumor effect of βCD-4TFEO-Pc against B16-F10 cells transplanted on to the chorioallantoic membranes of chickembryos was 52.7%, but that of laserirradiation alone and photosensitizer alone was <7% at thedose of 50 μg pereggand 100 J/cm² (50 mW). These data suggest that βCD-4TFEO-Pc is a useful photosensitizer for the treatment of superficial cancers. If a high-power LED with optimal wavelength is developed, excellent treatment of superficial cancers could be achieved by applying βCD-4TFEO-Pc for PDT.

Keywords

Photodynamic Therapy, Zinc Phthalocyanine, Photosensitizer

Conflicts of Interest

The authors declare no conflicts of interest.

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