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Metabolic effects of photodynamically induced apoptosis in an erythroleukemic cell line. A 31 P NMR spectroscopic study of Victoria‐Blue‐BO‐sensitized TF‐1 cells
Author(s) -
Viola Angèle,
Lutz Norbert W.,
Maroc Christine,
Chaban Christian,
Julliard Michel,
Cozzone Patrick J.
Publication year - 2000
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/(sici)1097-0215(20000301)85:5<733::aid-ijc22>3.0.co;2-c
Subject(s) - phosphocreatine , photosensitizer , phosphodiester bond , programmed cell death , chemistry , apoptosis , photodynamic therapy , intracellular , phosphocholine , biochemistry , microbiology and biotechnology , phospholipid , biophysics , biology , photochemistry , phosphatidylcholine , endocrinology , rna , organic chemistry , membrane , gene , energy metabolism
Victoria Blue BO (VB BO) is a new and promising photosensitizer currently being evaluated for photodynamic therapy (PDT). Its photochemical processes are mediated by oxygen radicals, but do not involve singlet oxygen. We used 31 P NMR spectroscopy of VB‐BO sensitized TF‐1 leukemic cells to gain further insight into the biochemical mechanisms underlying PDT‐induced cell death. Sham‐treatment experiments were performed to evaluate the effects of this photosensitizer in the absence of light irradiation. Significant metabolic differences were detected for TF‐1 cells incubated with VB BO but not exposed to light, as compared with native cells (controls). These changes include reductions in phosphocreatine, UDP‐hexose and phosphodiester levels (as percentage of total phosphate) and slightly reduced intracellular pH. Complete phosphocreatine depletion, significant acidification and concomitant inorganic‐phosphate accumulation were observed for TF‐1 cells irradiated after incubation with VB BO. Moreover, significant changes in phospholipid metabolites, i.e., accumulation of cytidine 5’‐diphosphate choline and a decrease in phosphodiester levels, were observed for PDT‐treated vs. sham‐treated cells. Perturbations of phospholipid metabolism may be involved in programmed cell death, and the detection of a characteristic DNA ladder pattern by gel electrophoresis confirmed the existence of apoptosis in PDT‐treated TF‐1 cells. Int. J. Cancer 85:733–739, 2000. © 2000 Wiley‐Liss, Inc.