Abstract：
:Recent studies have demonstrated that cytochrome c plays an important role in cell death. In the present study, we report that teniposide and various other chemotherapeutic agents induced a dose-dependent increase in the expression of the mitochondrial respiratory chain proteins cytochrome c, subunits I and IV of cytochrome c oxidase, and the free radical scavenging enzyme manganous superoxide dismutase. The teniposide-induced increase of cytochrome c was inhibited by cycloheximide, indicating new protein synthesis. Elevated cytochrome c levels were associated with enhanced cytochrome c oxidase-dependent oxygen uptake using TMPD/ascorbate as the electron donor, suggesting that the newly synthesized proteins were functional. Cytochrome c was released into the cytoplasm only after maximal levels had been reached in the mitochondria, but there was no concomitant decrease in mitochondrial membrane potential or caspase activation. Our results suggest that the increase in mitochondrial protein expression may play a role in the early cellular defense against anticancer drugs.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Sánchez-Alcázar JA,Khodjakov A,Schneider Esubject
Has Abstractpub_date
2001-02-01 00:00:00pages
1038-44issue
3eissn
0008-5472issn
1538-7445journal_volume
61pub_type
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