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Evaluation of Delocalized Lipophilic Cationic Dyes as Delivery Vehicles for Photosensitizers to Mitochondria by Ethel J. Ngen; Pallavi Rajaputra; Youngjae You is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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Mitochondria are attractive targets in photodynamic therapy. Two conjugates: TPP-Rh (a porphyrin-rhodamine B conjugate) and TPP-AO (a porphyrin-acridine orange conjugate), each possessing a single delocalized lipophilic cation, were designed and synthesized as photosensitizers. Their ability to target the mitochondria for photodynamic therapy was evaluated. The conjugates were synthesized by conjugating a monohydroxy porphyrin (TPP-OH) to rhodamine B (Rh B) and acridine orange base (AO), respectively, via a saturated hydrocarbon linker. To evaluate the efficiency of the conjugates as photosensitizers, their photophysical properties and in vitro photodynamic activities were studied in comparison to those of TPP-OH. Although fluorescence energy transfer (FRET) was observed in the conjugates, they were capable of generating singlet oxygen at rates comparable to TPP-OH. Biologically, exciting results were observed with TPP-Rh, which showed a much higher phototoxicity [IC(50), 3.95 microM: irradiation of 400-850 nm light (3 mW cm(-2)) for 1 h] than either TPP-OH or Rh B (both, IC(50), >20 microM) without significant dark toxicity at 20 microM. This improved photodynamic activity might b

Who reads Evaluation of Delocalized Lipophilic Cationic Dyes as Delivery Vehicles for Photosensitizers to Mitochondria?

Author

Ethel J. Ngen; Pallavi Rajaputra; Youngjae You

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0968-0896)

Published

2009

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)