Endoplasmic reticulum and Golgi apparatus are the preferential sites of Foscan localisation in cultured tumour cells

Intracellular photosensitiser localisation significantly influences the mechanism of response to photodynamic therapy (PDT), since the primary sites of damage are closely related to the specific sensitiser distribution. Foscan subcellular localisation in the MCF-7 human adenocarcinoma cell line has...

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Bibliographic Details
Published in:British journal of cancer 2003-01, Vol.88 (1), p.146-152
Main Authors: TEITEN, M-H, BEZDETNAYA, L, MORLIERE, P, SANTUS, R, GUILLEMIN, F
Format: Article
Language:English
Subjects:
Antineoplastic Agents - pharmacokinetics
Biological and medical sciences
Cancer research
Cytotoxicity
Endoplasmic reticulum
Endoplasmic Reticulum - metabolism
Experimental Therapeutics
Golgi Apparatus - metabolism
Humans
Light
Localization
Medical research
Medical sciences
Mesoporphyrins - pharmacokinetics
Microscopy
Microscopy, Confocal
Photochemistry
Photoradiation therapy and photosensitizing agent
Regulatory approval
Spectrometry, Fluorescence
Subcellular Fractions
Topography
Treatment with physical agents
Treatment. General aspects
Tumor Cells, Cultured
Tumors
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Summary:Intracellular photosensitiser localisation significantly influences the mechanism of response to photodynamic therapy (PDT), since the primary sites of damage are closely related to the specific sensitiser distribution. Foscan subcellular localisation in the MCF-7 human adenocarcinoma cell line has been studied by means of confocal microscopy and microspectrofluorometry. The fluorescence topographic profiles recorded after cells costained with Foscan and organelle-specific fluorescent probes revealed that Foscan presents low localisation in lysosomes and a weak accumulation in mitochondria. Alternatively, the Foscan fluorescence topographic profile turned out to colocalise perfectly with that obtained for the endoplasmic reticulum (ER) and the Golgi apparatus. The patterns of fluorescence derived from confocal microscopy studies were consistent with predominant localisation of Foscan in these organelles. Furthermore, evaluation of enzymatic activity of selected organelles immediately after laser light irradiation (650 nm) indicated the Golgi apparatus and ER as the primary damaged sites resulting from Foscan-mediated PDT in the MCF-7 cell line. To our knowledge, this is the first study to demonstrate unambiguously that the ER and the Golgi apparatus are preferential sites of Foscan accumulation.
ISSN:0007-0920
1532-1827
DOI:10.1038/sj.bjc.6600664