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Proceedings Paper

Photodynamic therapy using hemagglutinating virus of Japan envelope (HVJ-E): a novel therapeutic approach for the treatment of hormone antagonistic prostate cancer
Author(s): Mizuho Inai; Masaya Yamauchi; Norihiro Honda; Hisanao Hazama; Shoji Tachikawa; Hiroyuki Nakamura; Tomoki Nishida; Hidehiro Yasuda; Yasufumi Kaneda; Kunio Awazu
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Paper Abstract

Traditional treatment options for prostate cancer are insufficient to cure advanced drug-resistant prostate cancer. Thus, as an alternative form of cancer therapy, photodynamic therapy (PDT) has become the main subject of intense investigation as a possible treatment modality. In this study, ultraviolet-inactivated viral vector, called hemagglutinating virus of Japan envelope (HVJ-E) was utilized to establish an effective delivery system for photosensitizer. Lipidated protoporphyrin IX (PpIX lipid) was inserted in HVJ-E by centrifugation to create a new drug delivering system that allows selective accumulation of photosensitizers in cancer cells. To study in vitro drug release mechanism of porphyrus envelope, the ultra-high voltage electron microscope tomography was applied. Next, to evaluate the photodynamic efficiency of porphyrus envelope for hormone antagonistic prostate cancer cells (PC-3), uptake of porphyrus envelope derived PpIX lipid and PpIX induced from exogenously administered precursor of 5-aminolevulinic acid hydrochloride (5-ALA) were compared by measuring fluorescence intensity of PpIX. Finally, to evaluate the efficacy of porphyrus envelope-PDT, laser light at a wavelength of 405 nm was irradiated to PC-3 cells. As a result, incorporation of porphyrus envelope-derived PpIX lipid occurred via membrane fusion, giving the highest fluorescence intensity when compared to 5-ALA-induced PpIX. Also, results from PDT experiment revealed the 28.6 × 103-fold and 206-fold increase in therapeutic efficacy when compared to those of PDT using 5-ALA induced PpIX and PpIX lipid, respectively. Our findings suggest how porphyrus envelope can induce efficient accumulation of PpIX lipid, which can enhance the therapeutic efficacy of PDT against hormone antagonistic prostate cancer.

Paper Details

Date Published: 2 March 2015
PDF: 7 pages
Proc. SPIE 9308, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXIV, 930814 (2 March 2015); doi: 10.1117/12.2080692
Show Author Affiliations
Mizuho Inai, Osaka Univ. (Japan)
Masaya Yamauchi, Osaka Univ. (Japan)
Norihiro Honda, Osaka Univ. (Japan)
Hisanao Hazama, Osaka Univ. (Japan)
Shoji Tachikawa, Tokyo Institute of Technology (Japan)
Gakushuin Univ. (Japan)
Hiroyuki Nakamura, Tokyo Institute of Technology (Japan)
Tomoki Nishida, Osaka Univ. (Japan)
Hidehiro Yasuda, Osaka Univ. (Japan)
Yasufumi Kaneda, Osaka Univ. (Japan)
Kunio Awazu, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 9308:
Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy XXIV
David H. Kessel; Tayyaba Hasan, Editor(s)

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