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• W2075031971 abstract "Water-soluble, core-modified 5,10,15, 20-tetrakis(4-sulfonatophenyl)-21,23-dithiaporphyrin (1) and 5,10,15, 20-tetrakis(4-sulfonatophenyl)-21,23-diselenaporphyrin (2) were prepared as the tetrasodium salts by the sulfonation of 5,10,15, 20-tetraphenyl-21,23-dithiaporphyrin (3) and -21, 23-diselenaporphyrin (4), respectively, with sulfuric acid. Compounds 3 and 4 were prepared by the condensation of pyrrole with either 2,5-bis(phenylhydroxymethyl)thiophene (5) or 2, 5-bis(phenylhydroxymethyl)selenophene (6) in propionic acid. The addition of benzaldehyde to 2,5-dilithiothiophene or 2, 5-dilithioselenophene gives 5 or 6, respectively, as a nearly equimolar mixture of meso- and d,l-diastereomers. Careful crystallization of 5 gives a single diastereomer by removing the crystalline product from the equilibrating mixture of diastereomers in solution. Photodynamic therapy (PDT) with 1 has an LD(50) of less than 25 microg/mL against Colo-26 cells in culture and exhibits a lethal dose for 90% or more at concentrations greater than 50 microg/mL. In contrast, PDT with 5,10,15, 20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS(4)) requires concentrations of greater than 100 microg/mL to achieve LD(50). Neither 1 nor TPPS(4) shows significant photoactivity against the murine T-cell line, MOLT-4, above the dark toxicity. Sensitizer 1 shows no toxicity or side effects in BALB/c mice observed for 30 days following a single intravenous injection of 10 mg (9.1 micromol)/kg. Distribution studies show that sensitizer 1 accumulates in the tumors of BALB/c mice bearing Colo-26 or EMT-6 tumors with sensitizer concentration roughly doubling as the dosage of 1 increased from 5 to 10 mg/kg. In vivo studies show that PDT with sensitizer 1 at both 3.25 and 10 mg/kg with 135 J cm(-2) of 694-nm light is effective against Colo-26 tumors in BALB/c mice." @default.
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• W2075031971 date "2000-05-26" @default.
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• W2075031971 title "Water-Soluble, Core-Modified Porphyrins as Novel, Longer-Wavelength-Absorbing Sensitizers for Photodynamic Therapy" @default.
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• W2075031971 doi "https://doi.org/10.1021/jm000044i" @default.
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