12 February 2018 Subcellular localization and photodynamic activity of Photodithazine (glucosamine salt of chlorin e6) in murine melanoma B16-F10: an in vitro and in vivo study
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Abstract
Photodynamic therapy (PDT) is already a good option for the clinical treatment of several lesions, including mainly nonmelanoma skin cancers. However, cutaneous melanoma treatment remains a challenge when using PDT. One of the reasons for its reduced efficacy is the high pigmentation of melanoma cells. The object of our study is to evaluate the feasibility of the Photodithazine as a photosensitizer for melanoma. Photodithazine is already used in some malignant tumors with satisfactory results and has significant absorption band around 660 nm where the absorption of melanin is low. In this study, we measured the subcellular localization and photodynamic activity of Photodithazine (PDZ) in murine melanoma B16-F10 cell culture. Additionally, a PDT procedure was applied in an animal melanoma model. This first result demonstrates that Photodithazine is more localized at mitochondria in B16F10 cell culture and the cell viability is reduced to less than 90% using 1 µg/mL (PDZ) and 2 J/cm2. We also noticed a rapid PDZ (less than one hour) accumulation in a murine melanoma model. The treatment of melanoma resulted in 20 % more animal survival after one session of PDT compared with the control group. More studies are required to evaluate the cytotoxic effects of Photodithazine at human melanoma.
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Bruno Andrade Ono, Bruno Andrade Ono, Layla Pires, Layla Pires, Marcelo Saito Nogueira, Marcelo Saito Nogueira, Cristina Kurachi, Cristina Kurachi, Sebastião Pratavieira, Sebastião Pratavieira, } "Subcellular localization and photodynamic activity of Photodithazine (glucosamine salt of chlorin e6) in murine melanoma B16-F10: an in vitro and in vivo study", Proc. SPIE 10476, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXVII, 1047616 (12 February 2018); doi: 10.1117/12.2283241; https://doi.org/10.1117/12.2283241
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