Cited by 579Cell death mechanisms and regulationCancer-related Molecular PathwaysFlavonoids in Medical Research

Apoptosis initiated by Bcl-2-regulated caspase activation independently of the cytochrome c/Apaf-1/caspase-9 apoptosome

Marsden, Vanessa S., O'Connor, Liam, O'Reilly, Lorraine A., Silke, John, Metcalf, Donald, Ekert, Paul G., Huang, David C. S., Cecconi, Francesco +8 more·2002·Nature

Abstract

Apoptosis is an evolutionarily conserved cell suicide process executed by cysteine proteases (caspases) and regulated by the opposing factions of the Bcl-2 protein family. Mammalian caspase-9 and its activator Apaf-1 were thought to be essential, because mice lacking either of them display neuronal hyperplasia and their lymphocytes and fibroblasts seem resistant to certain apoptotic stimuli. Because Apaf-1 requires cytochrome c to activate caspase-9, and Bcl-2 prevents mitochondrial cytochrome c release, Bcl-2 is widely believed to inhibit apoptosis by safeguarding mitochondrial membrane integrity. Our results suggest a different, broader role, because Bcl-2 overexpression increased lymphocyte numbers in mice and inhibited many apoptotic stimuli, but the absence of Apaf-1 or caspase-9 did not. Caspase activity was still discernible in cells lacking Apaf-1 or caspase-9, and a potent caspase antagonist both inhibited apoptosis and retarded cytochrome c release. We conclude that Bcl-2 regulates a caspase activation programme independently of the cytochrome c/Apaf-1/caspase-9 'apoptosome', which seems to amplify rather than initiate the caspase cascade.

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Crossref · 10.1038/nature01101

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  • Blocking post-mitochondrial caspase activation by genetic means or with specific pharmacological inhibitors (Z-VAD-fmk and Q-VD-OPh) generally delays (but does not prevent) intrinsic apoptosis in vitro and in vivo (at least in the mammalian system), as it promotes a switch to other types of RCD.

    “Accordingly, blocking post-mitochondrial caspase activation by genetic means or with specific pharmacological inhibitors, such as to N-benzyloxycarbonyl-Val-Ala-Asp(O-Me) fluoromethylketone (Z-VAD-fmk) and (3S)-5-(2,6-difluorophenoxy)-3-[[(2S)-3-methyl-1-oxo-2-[(2-quinolinylcarbonyl)amino]butyl]amino]-4-oxo-pentanoic acid hydrate (Q-VD-OPh), generally delays (but does not prevent) intrinsic apopt”

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Authors
Marsden, V. S., O'Connor, L., O'Reilly, L. A., Silke, J., Metcalf, D., Ekert, P. G., Huang, D. C. S., Cecconi, F., Kuida, K., Tomaselli, K. J., Roy, S., Nicholson, D. W., Vaux, D. L., Bouillet, P., Adams, J. M., & Strasser, A.
Affiliations
  • Walter and Eliza Hall Institute of Medical Research (AU)
  • University of Rome Tor Vergata (IT)
  • Vertex Pharmaceuticals (United States) (US)
  • Merck Canada Inc. (Canada) (CA)
Corresponding author
Strasser, Andreas
Venue
Nature
Published
2002-09-25
Volume
419
Issue
6907
Pages
634-637
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1978093163
Cited by
578
References
30
Citations by year
2026: 13 · 2025: 7 · 2024: 17 · 2023: 13 · 2022: 14 · 2021: 22 · 2020: 13 · 2019: 17 · 2018: 18 · 2017: 26 · 2016: 24 · 2015: 18 · 2014: 24 · 2013: 15 · 2012: 20
FWCI
21.90
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Health Sciences › Medicine › Pharmacology › Flavonoids in Medical Research
Keywords
apoptosis, Bcl-2, caspase activation, caspase-9, Apaf-1, cytochrome c release, apoptosome, Bcl-2 family proteins, lymphocyte proliferation, mitochondrial membrane integrity
MeSH terms
Animals, B-Lymphocytes, Cells, Cultured, Cytochrome c Group, Enzyme Activation, Hematopoiesis, Mice, Inbred C57BL, Proteins, T-Lymphocytes, Apoptosis, Proto-Oncogene Proteins c-bcl-2, Caspases, Mice, Caspase 9, Apoptotic Protease-Activating Factor 1

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