Nitric oxide-induced apoptosis in human leukemic lines requires mitochondrial lipid degradation and cytochrome C release
We have previously shown that nitric oxide (NO) stimulates apoptosis in different human neoplastic lymphoid cell lines through activation of caspases not only via CD95/CD95L interaction, but also independently of such death receptors. Here we investigated mitochondria-dependent mechanisms of NO-indu...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
April 1, 1999
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| In: |
Blood
Year: 1999, Volume: 93, Issue: 7, Pages: 2342-2352 |
| ISSN: | 1528-0020 |
| DOI: | undefined |
| Online Access: | Verlag, Volltext: http://dx.doi.org/undefined Verlag, Volltext: http://www.bloodjournal.org/content/93/7/2342 
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| Author Notes: | by Alexey Ushmorov, Frank Ratter, Volker Lehmann, Wulf Dröge, Volker Schirrmacher, and Victor Umansky |
| Summary: | We have previously shown that nitric oxide (NO) stimulates apoptosis in different human neoplastic lymphoid cell lines through activation of caspases not only via CD95/CD95L interaction, but also independently of such death receptors. Here we investigated mitochondria-dependent mechanisms of NO-induced apoptosis in Jurkat leukemic cells. NO donor glycerol trinitrate (at the concentration, which induces apoptotic cell death) caused (1) a significant decrease in the concentration of cardiolipin, a major mitochondrial lipid; (2) a downregulation in respiratory chain complex activities; (3) a release of the mitochondrial protein cytochrome c into the cytosol; and (4) an activation of caspase-9 and caspase-3. These changes were accompanied by an increase in the number of cells with low mitochondrial transmembrane potential and with a high level of reactive oxygen species production. Higher resistance of the CD95-resistant Jurkat subclone (APO-R) cells to NO-mediated apoptosis correlated with the absence of cytochrome c release and with less alterations in other mitochondrial parameters. An inhibitor of lipid peroxidation, trolox, significantly suppressed NO-mediated apoptosis in APO-S Jurkat cells, whereas bongkrekic acid (BA), which blocks mitochondrial permeability transition, provided only a moderate antiapoptotic effect. Transfection of Jurkat cells with bcl-2 led to a complete block of apoptosis due to the prevention of changes in mitochondrial functions. We suggest that the mitochondrial damage (in particular, cardiolipin degradation and cytochrome c release) induced by NO in human leukemia cells plays a crucial role in the subsequent activation of caspase and apoptosis. |
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| Item Description: | Gesehen am 20.02.2019 Der Vorname von Viktor Umansky ist in der Verfasserangabe falsch geschrieben |
| Physical Description: | Online Resource |
| ISSN: | 1528-0020 |
| DOI: | undefined |