1 July 2008 Effect of liposomal confinement on photochemical properties of photosensitizers with varying hydrophilicity
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Preferential tumor localization and the aggregation state of photosensitizers (PSs) can depend on the hydrophilic/hydrophobic nature of the molecule and affect their phototoxicity. In this study, three PSs of different hydrophilicity are introduced in liposomes to understand the structure-photochemistry relationship of PSs in this cellular model system. Absorbance and fluorescence spectra of amphiphilic aluminum (III) phthalocyanine disulfonate chloride adjacent isomer (Al-2), hydrophilic aluminum (III) phthalocyanine chloride tetrasulfonic acid (Al-4), and lipophilic 2-(1-hexyloxyethyl)-2-devinyl pyropheophorbide (HPPH) are compared in a liposomal confined state with free PS in bulk solution. For fluorescence measurements, a broad range of concentrations of both bulk and liposomal confined PSs are examined to track the transition from monomers to dimers or higher order aggregates. Epifluorescence microscopy, absorbance, and fluorescence measurements all confirm different localization of the PSs in liposomes, depending on their hydrophilicity. In turn, the localization affects the aggregation of molecules inside the liposome cell model. Data obtained with such cellular models could be useful in optimizing the photochemical properties of photosensitizing drugs based on their structure-dependent interactions with cellular media and subcellular organelles.
© (2008) Society of Photo-Optical Instrumentation Engineers (SPIE)
Isabelle Noiseux, Isabelle Noiseux, Ozzy Mermut, Ozzy Mermut, Jean-Pierre Bouchard, Jean-Pierre Bouchard, Jean-François Cormier, Jean-François Cormier, Patrice Desroches, Patrice Desroches, Michel Fortin, Michel Fortin, Pascal Gallant, Pascal Gallant, Sébastien Leclair, Sébastien Leclair, Marcia L. Vernon, Marcia L. Vernon, Kevin R. Diamond, Kevin R. Diamond, Michael S. Patterson, Michael S. Patterson, } "Effect of liposomal confinement on photochemical properties of photosensitizers with varying hydrophilicity," Journal of Biomedical Optics 13(4), 041313 (1 July 2008). https://doi.org/10.1117/1.2950309 . Submission:

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