Dinitrosyl-iron triggers apoptosis in Jurkat cells despite overexpression of Bcl-2

Free Radical Biology & Medicine
A L KleschyovThomas Munzel

Abstract

Cells expressing the cytokine-inducible NO synthase are known to trigger apoptosis in neighboring cells. Paramagnetic dinitrosyl nonheme iron complexes (DNIC) were found in tumor tissue about 40 years ago; however, the role of these NO(+)-bearing species is not completely understood. In the human Jurkat leukemia cell line, the application of the model complex DNIC-thiosulfate (50-200 microM) induced apoptosis (defined by phosphatidylserine externalization) in a concentration- and time-dependent manner. In Jurkat cells, the pan-caspase inhibitor, zVADfmk (50 microM), and/or stable transfection of antiapoptotic protein, Bcl-2, was unable to afford protection against DNIC-induced apoptosis. The membrane-impermeable metal chelator, N-methyl-D-glucamine dithiocarbamate (MGD; 200 microM), in the presence of DNIC significantly increased apoptosis, but had no effect on its own. Electron paramagnetic resonance studies showed that MGD led to rapid transformation of the extracellular DNIC into the stable impermeable NO-Fe-MGD complex and to a burst-type release of nitrosonium (NO(+)) equivalents in the extracellular space. These results suggest that in Jurkat cells, DNIC-thiosulfate induces Bcl-2- and caspase-independent apoptosis, which ...Continue Reading

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