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A Comparative Analysis of Silicon Phthalocyanine Photosensitizers for in vivo Photodynamic Therapy of RIF‐1 Tumors in C3H Mice
Author(s) -
Anderson Cathy Y.,
Freye Kristin,
Tubesing Karen A.,
Li YingSyi,
Kenney Malcolm E.,
Mukhtar Hasan,
Elmets Craig A.
Publication year - 1998
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1998.tb05206.x
Subject(s) - photodynamic therapy , phototoxicity , photosensitizer , in vivo , photosensitivity , phthalocyanine , medicine , cancer research , photochemistry , chemistry , optoelectronics , materials science , in vitro , nanotechnology , biology , organic chemistry , biochemistry , microbiology and biotechnology
Photofrin® photodynamic therapy (PDT) has recently received FDA approval for the palliative treatment of to‐tally and partially obstructing esophageal malignancies. However, there is a need for new PDT photosensitizers because Photofrin has a number of undesirable features. The purpose of this study was to evaluate the efficacy of four amine‐bearing silicon phthalocyanines—Pc4, Pc10, Pc12 and Pc18—as potential PDT photosensitizers. Equimolar concentrations of these Pc were found to be highly effective at causing the regression of RIF‐1 tumors trans‐planted to C3H/HeN mice. The amount of Pc4 necessary to cause an equivalent amount of tumor regression in this model system was substantially less than the amount of Photofrin. The cutaneous phototoxicity of the silicon Pc photosensitizer was assessed by the utilization of the murine ear‐swelling model. When C3H mice were exposed to 167 J/cm 2 of polychromatic visible light from a UVB‐filtered solar simulator, which emitted UV radiation and visible light above 320 nm, the Pc produced little, if any, cutaneous photosensitivity. These results indicate that Pc4, Pc10, Pc12 and Pc18 are at least as effective as Photofrin in PDT protocols, while at the same time addressing many of the drawbacks of Photofrin.