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Abstract
Concentrations of rotenone (ROT) that block electron flow through mitochondrial complex I (100 nM) did not significantly alter either cell viability or the growth of PW cells. However, 10- to 50-fold higher concentrations (1-5 microM) were found to induce a dose-dependent cell cycle arrest predominantly at the G2/M stage of the cycle and apoptosis. Apoptosis was dependent on the cell cycle arrest, since apoptosis but not the G2/M arrest was prevented with the broad spectrum caspase inhibitor zVADfmk. Biochemical features of apoptosis included mitochondrial cytochrome c release, reactive oxygen species generation, and the activation of procaspase 3. Thus, ROT inhibition of mitochondrial electron transport may be insufficient to induce apoptosis in PW cells. Instead, apoptosis in these cells occurs as a consequence of disruption of the cell cycle and is only indirectly dependent upon mitochondrial electron transport.
View details for DOI 10.1006/bbrc.2001.6054
View details for Web of Science ID 000173406500010
View details for PubMedID 11741286