Cited by 1,176Mitochondrial Function and PathologyCell death mechanisms and regulationRedox biology and oxidative stress

Electron transfer between cytochrome c and p66Shc generates reactive oxygen species that trigger mitochondrial apoptosis

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Giorgio, Marco, Migliaccio, Enrica, Orsini, Francesca, Paolucci, Demis, Moroni, Maurizio, Contursi, Cristina, Pelliccia, Giovanni, Luzi, Lucilla +7 more·2005·Cell

Abstract

Reactive oxygen species (ROS) are potent inducers of oxidative damage and have been implicated in the regulation of specific cellular functions, including apoptosis. Mitochondrial ROS increase markedly after proapoptotic signals, though the biological significance and the underlying molecular mechanisms remain undetermined. P66Shc is a genetic determinant of life span in mammals, which regulates ROS metabolism and apoptosis. We report here that p66Shc is a redox enzyme that generates mitochondrial ROS (hydrogen peroxide) as signaling molecules for apoptosis. For this function, p66Shc utilizes reducing equivalents of the mitochondrial electron transfer chain through the oxidation of cytochrome c. Redox-defective mutants of p66Shc are unable to induce mitochondrial ROS generation and swelling in vitro or to mediate mitochondrial apoptosis in vivo. These data demonstrate the existence of alternative redox reactions of the mitochondrial electron transfer chain, which evolved to generate proapoptotic ROS in response to specific stress signals.

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Crossref · 10.1016/j.cell.2005.05.011

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  • p66SHC sustains intracellular ROS and regulates redox signaling, mitochondrial apoptosis, and aging.

    “P66SHC protein is the largest isoform encoded by the ShcA locus, typical of vertebrates, and it sustains intracellular levels of ROS (Giorgio et al., 2005 Gertz & Steegborn, 2010) and regulates redox signaling pathways (Frijhoff et al., 2014), mitochondrial apoptosis (Migliaccio et al., 2006), and aging (Trinei et al., 2009).”
  • Within mitochondria, p66Shc increases oxidant production by oxidizing cytochrome c to produce hydrogen peroxide and activate the mitochondrial transition pore.

    “Within the mitochondria, p66Shc increases oxidant production by oxidizing cytochrome c to produce hydrogen peroxide and activate the mitochondrial transition pore (153).”

    From Redox regulation of mitochondrial function (2012) · cites this paper as [153]

  • PKCβ-induced Ser26 phosphorylation of p66Shc triggers its transport from cytosol to mitochondria, where it promotes reactive oxygen species accumulation by oxidizing cytochrome c and leads to apoptosis.

    “Induction of Ser26 phosphorylation of p66Shc by protein kinase C-β (PKCβ) triggers the transport of p66Shc from the cytosol to mitochondria, where it promotes ROS accumulation by oxidizing cytochrome c184, ultimately leading to apoptosis.”

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  1. Armstrong, F.A. (2002). Insights from protein film voltammetry into mechanisms of complex biological electron-transfer reactions. J. Chem. Soc., Dalton Trans. 5 , 661.

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Authors
Giorgio, M., Migliaccio, E., Orsini, F., Paolucci, D., Moroni, M., Contursi, C., Pelliccia, G., Luzi, L., Minucci, S., Marcaccio, M., Pinton, P., Rizzuto, R., Bernardi, P., Paolucci, F., & Pelicci, P. G.
Affiliations
  • IFOM (IT)
  • University of Bologna (IT)
  • European Institute of Oncology (IT)
  • University of Ferrara (IT)
  • University of Padua (IT)
  • University of Milan (IT)
Corresponding author
  • Giorgio, Marco
  • Pelicci, Pier Giuseppe
Venue
Cell
Publisher
Elsevier BV
Published
2005-07
Volume
122
Issue
2
Pages
221-233
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2150381945
Cited by
1,176
References
36
Citations by year
2026: 26 · 2025: 45 · 2024: 41 · 2023: 42 · 2022: 52 · 2021: 56 · 2020: 71 · 2019: 64 · 2018: 56 · 2017: 56 · 2016: 56 · 2015: 55 · 2014: 83 · 2013: 66 · 2012: 72
FWCI
18.69
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion)
  • Institutional Research Information System University of Ferrara (University of Ferrara) (submittedVersion)
  • Padua Research Archive (University of Padova) (submittedVersion, other-oa)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
p66Shc, cytochrome c, electron transfer, reactive oxygen species, mitochondrial apoptosis, hydrogen peroxide, mitochondrial electron transport chain, redox signaling, oxidative stress, mitochondrial swelling, lifespan
MeSH terms
Src Homology 2 Domain-Containing, Transforming Protein 1, Amino Acid Sequence, Animals, Cells, Cultured, Electron Transport, Hydrogen Peroxide, Intracellular Membranes, Mitochondria, Liver, Molecular Sequence Data, Mutation, Oxidation-Reduction, Permeability, Signal Transduction, Apoptosis, Reactive Oxygen Species, Protein Structure, Tertiary, Cytochromes c, Adaptor Proteins, Signal Transducing, Mice, Shc Signaling Adaptor Proteins

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