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Photodynamic effects induced by meso-tetrakis[4-(carboxymethyleneoxy)phenyl]porphyrin on isolated Sarcoma 180 ascites mitochondria

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Title Photodynamic effects induced by meso-tetrakis[4-(carboxymethyleneoxy)phenyl]porphyrin on isolated Sarcoma 180 ascites mitochondria
 
Creator CHATTERJEE, SR
POSSEL, H
SRIVASTAVA, TS
KAMAT, JP
WOLF, G
DEVASAGAYAM, TPA
 
Subject subcellular-localization
lipid-peroxidation
free-radicals
therapy
photosensitization
porphyrin
hematoporphyrin
oxidation
invitro
cancer
porphyrin derivatives
tumours
lipid peroxidation
succinate dehydrogenase
photosensitization
singlet oxygen
triplet lifetime
energy transfer
 
Description Using mitochondria isolated from Sarcoma 180 ascites tumour in Swiss mice as a model system, we have evaluated the ability of a novel porphyrin, meso-tetrakis [4- (carboxymethyleneoxy) phenyl] porphyrin (H(2)T4CPP), to induce damage on photosensitization. Oxidative damage to mitochondria, one of the primary and crucial targets of the photodynamic effect, is assessed by measuring products of lipid peroxidation such as thiobarbituric acid reactive substances (TBARS) and lipid hydroperoxides (LOOH), besides the loss of activity of the mitochondrial marker enzyme succinate dehydrogenase ( SDH). Analysis of product formation, the effect of deuteration and selective inhibition by scavengers of reactive oxygen species (ROS) show that the damage observed is due mainly to singlet oxygen (O-1(2)) and to a minor extent to hydroxyl radicals ((OH)-O-.). The O-1(2) generation and triplet lifetime of this porphyrin have also been estimated. Fluorescence spectroscopy, used to ascertain the binding of this porphyrin to the mitochondrial proteins, shows a rapid association within 0-2 h and a decline thereafter. Confocal microscopy reveals intracellular localisation of this porphyrin in cells in vitro. Our overall results suggest that the porphyrin H(2)T4CPP, due to its ability to bind to mitochondrial protein components and to generate ROS upon photoexcitation, may have potential applications in photodynamic therapy. (C) 1999 Elsevier Science S.A. .
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-28T16:25:09Z
2011-12-26T13:02:52Z
2011-12-27T05:50:08Z
2011-07-28T16:25:09Z
2011-12-26T13:02:52Z
2011-12-27T05:50:08Z
1999
 
Type Article
 
Identifier JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY, 50(2-3), 79-87
1011-1344
http://dx.doi.org/10.1016/S1011-1344(99)00073-1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7446
http://hdl.handle.net/10054/7446
 
Language en