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Superoxide-dependent and -independent mitochondrial signaling during apoptosis in multiple myeloma cells

Abstract

Superoxide (O2) radicals have been linked to apoptosis. Here, we show that 2-methoxyestradiol (2ME2)-induced apoptosis in multiple myeloma (MM) cells is associated with O2 generation, whereas dexamethasone (Dex)-induced apoptosis occurs without concurrent increase in O2. In contrast, both these agents decrease mitochondrial transmembrane potential (Δψm). Treatment of MM cells with an antioxidant N-acetyl-L-cysteine blocks 2ME2, but not Dex-induced apoptosis as well as release of mitochondrial proteins cytochrome c (cyto c) and Smac. Taken together, these results demonstrate that there are at least two distinct apoptotic pathways: one dependent on O2, which is induced by 2ME2 and is associated with release of cyto c and Smac; and the other an independent of O2, which is triggered by Dex and associated with Smac release.

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Abbreviations

MM:

multiple myeloma

O2:

superoxide

cyto c:

cytochrome c

Smac:

second mitochondrial activator of caspase

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Acknowledgements

This investigation was supported by NIH Grants 50947 and CA 78373, a Doris Duke Distinguished Clinical Research Scientist Award (KCA), The Myeloma Research Fund, and The Cure Myeloma Fund.

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Correspondence to Kenneth C Anderson.

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Chauhan, D., Li, G., Sattler, M. et al. Superoxide-dependent and -independent mitochondrial signaling during apoptosis in multiple myeloma cells. Oncogene 22, 6296–6300 (2003). https://doi.org/10.1038/sj.onc.1206734

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