Mitochondrial cytochrome c release in apoptosis occurs upstream of DEVD-specific caspase activation and independently of mitochondrial transmembrane depolarization
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TLDR
It is reported that cytochrome c release from mitochondria is an early event in the apoptotic process induced by UVB irradiation or staurosporine treatment in CEM or HeLa cells, preceding or at the time of DEVD‐specific caspase activation and substrate cleavage.Abstract:
Mitochondrial cytochrome c, which functions as an electron carrier in the respiratory chain, translocates to the cytosol in cells undergoing apoptosis, where it participates in the activation of DEVD-specific caspases. The apoptosis inhibitors Bcl-2 or Bcl-xL prevent the efflux of cytochrome c from mitochondria. The mechanism responsible for the release of cytochrome c from mitochondria during apoptosis is unknown. Here, we report that cytochrome c release from mitochondria is an early event in the apoptotic process induced by UVB irradiation or staurosporine treatment in CEM or HeLa cells, preceding or at the time of DEVD-specific caspase activation and substrate cleavage. A reduction in mitochondrial transmembrane potential (Deltapsim) occurred considerably later than cytochrome c translocation and caspase activation, and was not necessary for DNA fragmentation. Although zVAD-fmk substantially blocked caspase activity, a reduction in Deltapsim and cell death, it failed to prevent the passage of cytochrome c from mitochondria to the cytosol. Thus the translocation of cytochrome c from mitochondria to cytosol does not require a mitochondrial transmembrane depolarization.read more
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Journal ArticleDOI
Mitochondria and apoptosis
Douglas R. Green,John C. Reed +1 more
TL;DR: A variety of key events in apoptosis focus on mitochondria, including the release of caspase activators (such as cytochrome c), changes in electron transport, loss of mitochondrial transmembrane potential, altered cellular oxidation-reduction, and participation of pro- and antiapoptotic Bcl-2 family proteins.
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Cleavage of BID by Caspase 8 Mediates the Mitochondrial Damage in the Fas Pathway of Apoptosis
TL;DR: The results indicate that BID is a mediator of mitochondrial damage induced by Casp8, and coexpression of BclxL inhibits all the apoptotic changes induced by tBID.
Journal ArticleDOI
Molecular characterization of mitochondrial apoptosis-inducing factor
Santos A. Susin,Hans K. Lorenzo,Naoufal Zamzami,Isabel Marzo,Bryan E. Snow,Joan Mangion,Etienne Jacotot,Paola Costantini,Markus Loeffler,Nathanael Larochette,David R. Goodlett,Ruedi Aebersold,David P. Siderovski,Josef M. Penninger,Guido Kroemer +14 more
TL;DR: The identification and cloning of an apoptosis-inducing factor, AIF, which is sufficient to induce apoptosis of isolated nuclei is reported, indicating that AIF is a mitochondrial effector of apoptotic cell death.
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The Bcl2 family: regulators of the cellular life-or-death switch.
Suzanne Cory,Jerry M. Adams +1 more
TL;DR: A better understanding of how the Bcl2 family controls caspase activation should result in new, more effective therapeutic approaches in tissue homeostasis and cancer.
Journal ArticleDOI
BCL-2 family members and the mitochondria in apoptosis
TL;DR: As the BCL-2 family members reside upstream of irreversible cellular damage and focus much of their efforts at the level of mitochondria, they play a pivotal role in deciding whether a cell will live or die, and it is argued that the amphipathic a-helical BH3 domain serves as a critical death domain in the pro-apoptotic members.
References
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TL;DR: This work was supported in part by Grants-in-Aid from the Ministry of Education, Science, and Culture of Japan and by a Research Grant from the Princess Takamatsu Cancer Research Fund, and performed in part through Special Coordination Funds of the Science and Technology Agency of the Japanese Government.
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