Zinc coproporphyrin i derived from meconium has an antitumor effect associated with singlet oxygen generation

Hidechika Ozawa, Toshihiko Asahina, Hirotake Murakami, Chidzuko Yaguchi, Yasuhiro Kohmura, Eiji Kohno, Toru Hirano, Kentaro Horiuchi, Naoaki Tamura, Kazuhiro Sugihara, Hidekazu Ooi, Naohiro Kanayama

研究成果: Article査読

1 被引用数 (Scopus)


Introduction: Zinc coproporphyrin I (ZnCP-I) is a photosensitive molecule and a major component of meconium. Here, we examined the effects of ZnCP-I as a potential photosensitizer in photodynamic therapy for tumors. Materials and Methods: (1) Aqueous ZnCP-I was irradiated with a pulsed YAG-SHG laser (wavelength: 532 nm)/YAG-SHG dye laser (wavelength: 566 nm). (2) HeLa cells were incubated in 200 mM ZnCP-I, and accumulation of ZnCP-I in HeLa cells was evaluated with ZnCP-I-specific fluorescence over 500 nm. (3) Aqueous ZnCP-I was administered intravenously to HeLa tumor-bearing mice at a dose of 10.2 mg/kg body weight. The tumors were irradiated with a filtered halogen lamp (wavelength: 580 nm) at 100 J/cm2 20 min after administration. Results: (1) An intense near-infrared emission spectrum was observed at around 1,270 nm after irradiation. The emission intensity was proportional to the laser power between 10 and 80 mW and was completely inhibited by addition of NaN 3, a singlet oxygen scavenger. (2) ZnCP-I-specific fluorescence was detected in the HeLa cell cytoplasm. (3) Irradiated tumors treated with ZnCP-I were mostly necrotized. Conclusion: ZnCP-I accumulated in tumor cells, produced singlet oxygen upon irradiation, and necrotized the tumor cells. These results suggest that ZnCP-I may be an effective photosensitizer.

ジャーナルFetal Diagnosis and Therapy
出版ステータスPublished - 03-2013

All Science Journal Classification (ASJC) codes

  • 小児科学、周産期医学および子どもの健康
  • 胎生学
  • 放射線学、核医学およびイメージング
  • 産婦人科学


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