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A role for manganese superoxide dismutase in apoptosis after photosensitization.

Abstract：

:The oxidative stress triggered by photodynamic therapy (PDT) involves generation of cytotoxic reactive oxygen species, including superoxide radical, accumulation of de novo-generated ceramide, and induction of apoptosis. Since PDT with the photosensitizer phthalocyanine Pc 4 induces mitochondrial damage and the superoxide scavenger manganese superoxide dismutase (MnSOD) is localized to mitochondria, here we tested genetically the role of MnSOD in apoptosis and ceramide accumulation after photosensitization with Pc 4. Jurkat cells overexpressing wild-type MnSOD were protected from Pc 4-PDT-initiated apoptosis, but not from increased ceramide response to Pc 4-PDT. In Jurkat cells overexpressing mutant MnSOD, however, DEVDase activation and ceramide formation were promoted post-Pc 4-PDT. Similarly, in MnSOD-null cells, Pc 4-PDT-induced apoptosis, as well as ceramide accumulation, were enhanced compared to their normal counterparts. The data show that MnSOD affects sensitivity of cells to Pc 4-PDT-initiated apoptosis, and partly ceramide accumulation, suggesting that the processes are superoxide-mediated.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Dolgachev V,Oberley LW,Huang TT,Kraniak JM,Tainsky MA,Hanada K,Separovic D

doi

10.1016/j.bbrc.2005.04.141

subject

Has Abstract

pub_date

2005-07-01 00:00:00

pages

411-7

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)00908-3

journal_volume

332

pub_type

杂志文章

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