title: Comparative photodynamic therapy cytotoxicity of mannose-conjugated chlorin and talaporfin sodium in cultured human and rat cells.
abstract: Photodynamic therapy (PDT) is a Food and Drug Administration authorized method for cancer treatment, which uses photosensitizer and laser photo-irradiation to generate reactive oxygen species to induce cell death in tumors. Photosensitizers have been progressively developed, from first to third generation, with improvements in cell specificity, reduced side effects and toxicity, increased sensitivity for irradiation and reduced persistence of photosensitizer in healthy cells. These improvements have been achieved by basic comparative experiments between current and novel photosensitizers using cell lines; however, photosensitizers should be carefully evaluated because they may have cell type specificity. In the present study, we compared a third-generation photosensitizer, β-mannose-conjugated chlorin (β-M-chlorin), with the second generation, talaporfin sodium (NPe6), using seven different rat and human cell lines and a neuronal/glial primary culture prepared from rat embryos. NPe6 was more effective than β-M-chlorin in human-derived cell lines, and β-M-chlorin was more effective than NPe6 in rat primary cultures and rat-derived cell lines, except for the rat pheochromocytoma cell line, PC12. These differences of phototoxicity in different cell types are not because of differences in photosensitivity between the photosensitizers, but rather are associated with different distribution and accumulation rates in the different cell types. These data suggest that evaluation of photosensitizers for PDT should be carried out using as large a variety of cell types as possible because each photosensitizer may have cell type specificity.
authors.affiliation: Department of Environmental Health, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences.
authors.forename: Yo
authors.initials: Y
authors.lastname: Shinoda
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Takahashi
authors.forename: Jiro
authors.initials: J
authors.lastname: Akimoto
authors.forename: Megumi
authors.initials: M
authors.lastname: Ichikawa
authors.forename: Hiromi
authors.initials: H
authors.lastname: Yamazaki
authors.forename: Atsushi
authors.initials: A
authors.lastname: Narumi
authors.forename: Shigenobu
authors.initials: S
authors.lastname: Yano
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Fujiwara
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002460:Cell Line; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D002478:Cells, Cultured; D006801:Humans; D008027:Light; D008358:Mannose / Q000737:chemistry / Q000494:pharmacology*; D009474:Neurons / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D016716:PC12 Cells; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000494:pharmacology*; D011166:Porphyrins / Q000737:chemistry / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000970:Antineoplastic Agents; D017319:Photosensitizing Agents; D011166:Porphyrins; C006969:chlorin; C053434:Talaporfin; D008358:Mannose