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Journal of Biomedical Optics

Effect of liposomal confinement on photochemical properties of photosensitizers with varying hydrophilicity
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Paper Abstract

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.

Paper Details

Date Published: 1 July 2008
PDF: 11 pages
J. Biomed. Opt. 13(4) 041313 doi: 10.1117/1.2950309
Published in: Journal of Biomedical Optics Volume 13, Issue 4
Show Author Affiliations
Isabelle Noiseux, Institut National d'Optique (Canada)
Ozzy Mermut, Institut National d'Optique (Canada)
Jean-Pierre Bouchard, Institut National d'Optique (Canada)
Jean-François Cormier, Institut National d'Optique (Canada)
Patrice Desroches, Institut National d'Optique (Canada)
Michel Fortin, Institut National d'Optique (Canada)
Pascal Gallant, Institut National d'Optique (Canada)
Sébastien Leclair, Institut National d'Optique (Canada)
Marcia L. Vernon, Institut National d'Optique (Canada)
Kevin R. Diamond, Juravinski Cancer Ctr. (Canada)
Michael S. Patterson, Juravinski Cancer Ctr. (Canada)

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