title: Sulfonated phthalimidomethyl aluminum phthalocyanine: the effect of hydrophobic substituents on the in vitro phototoxicity of phthalocyanines.
abstract: The photocytotoxicity of sulfonated phthalimidomethyl aluminum phthalocyanine, a more hydrophobic photosensitizer as compared to phthalocyanine substituted with sulfonate groups only, was investigated. Inclusion of 1-2 phthalimidomethyl groups into disulfonated aluminum phthalocyanine, resulted in increased partition coefficients between n-octanol and water, and a six-fold increase in both cellular uptake and photocytotoxicity towards Chinese hamster lung fibroblast cells (line V-79). Reducing the number of phthalimidomethyl groups, or increasing the degree of sulfonation, lead to a decrease in the partition coefficient, cellular uptake, and phototoxicity. The quantum yield of singlet oxygen was comparable for all dyes tested in this series, indicating that no significant change in this photophysical parameter resulted from phthalimidomethylation. These results suggest that the addition of 1-2 phthalimidomethyl groups to disulfonated aluminum phthalocyanine improves cellular uptake, but, as the relative efficiency of cell killing was not effected, the intracellular distribution on photosensitive molecules may not be modified.
authors.affiliation: MRC Group in the Radiation Sciences, Faculty of Medicine, University of Sherbrooke, Québec, Canada.
authors.forename: B
authors.initials: B
authors.lastname: Paquette
authors.forename: R W
authors.initials: RW
authors.lastname: Boyle
authors.forename: H
authors.initials: H
authors.lastname: Ali
authors.forename: A H
authors.initials: AH
authors.lastname: MacLennan
authors.forename: T G
authors.initials: TG
authors.lastname: Truscott
authors.forename: J E
authors.initials: JE
authors.lastname: van Lier
mesh_terms: D000818:Animals; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects*; D007211:Indoles / Q000378:metabolism / Q000494:pharmacology*; D008027:Light; D009942:Organometallic Compounds / Q000378:metabolism / Q000494:pharmacology*; D010797:Phthalimides / Q000378:metabolism / Q000494:pharmacology*; D011838:Radiation-Sensitizing Agents / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D007211:Indoles; D009942:Organometallic Compounds; D010797:Phthalimides; D011838:Radiation-Sensitizing Agents; C064331:aluminum phthalocyanine disulfonate