Electron transfer between cytochrome c and p66Shc generates reactive oxygen species that trigger mitochondrial apoptosis
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View abstract on PubMed
Summary
This summary is machine-generated.The protein p66Shc acts as a redox enzyme, generating mitochondrial reactive oxygen species (ROS) to signal apoptosis. This mechanism involves the mitochondrial electron transfer chain and cytochrome c, impacting cell death pathways.
Area Of Science
- Cellular Biology
- Biochemistry
- Molecular Medicine
Background
- Reactive oxygen species (ROS) are crucial in oxidative damage and cellular signaling, including apoptosis.
- Mitochondrial ROS levels rise with proapoptotic signals, but their role and mechanisms are unclear.
- P66Shc protein influences lifespan, ROS metabolism, and apoptosis.
Purpose Of The Study
- To elucidate the role and mechanism of p66Shc in generating mitochondrial ROS.
- To investigate p66Shc as a redox enzyme in apoptosis signaling.
Main Methods
- Investigated p66Shc's enzymatic activity in ROS generation.
- Utilized redox-defective p66Shc mutants.
- Assessed mitochondrial ROS production, swelling, and apoptosis in vitro and in vivo.
Main Results
- p66Shc functions as a redox enzyme generating mitochondrial hydrogen peroxide (ROS).
- p66Shc uses the mitochondrial electron transfer chain and oxidizes cytochrome c for ROS production.
- Redox-defective p66Shc mutants failed to induce mitochondrial ROS, swelling, or apoptosis.
Conclusions
- p66Shc generates proapoptotic mitochondrial ROS via alternative redox reactions in the electron transfer chain.
- This pathway highlights a novel mechanism for ROS-mediated apoptosis signaling.
- p66Shc's function provides insights into redox regulation of cell death and aging.
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