Mitochondrial manganese superoxide dismutase prevents neural apoptosis and reduces ischemic brain injury: suppression of peroxynitrite production, lipid peroxidation, and mitochondrial dysfunction
Open accessAbstract
Oxidative stress is implicated in neuronal apoptosis that occurs in physiological settings and in neurodegenerative disorders. Superoxide anion radical, produced during mitochondrial respiration, is involved in the generation of several potentially damaging reactive oxygen species including peroxynitrite. To examine directly the role of superoxide and peroxynitrite in neuronal apoptosis, we generated neural cell lines and transgenic mice that overexpress human mitochondrial manganese superoxide dismutase (MnSOD). In cultured pheochromocytoma PC6 cells, overexpression of mitochondria-localized MnSOD prevented apoptosis induced by Fe 2+, amyloid β-peptide (Aβ), and nitric oxide-generating agents. Accumulations of peroxynitrite, nitrated proteins, and the membrane lipid peroxidation product 4-hydroxynonenal (HNE) after exposure to the apoptotic insults were markedly attenuated in cells expressing MnSOD. Glutathione peroxidase activity levels were increased in cells overexpressing MnSOD, suggesting a compensatory response to increased H 2 O 2 levels. The peroxynitrite scavenger uric acid and the antioxidants propyl gallate and glutathione prevented apoptosis induced by each apoptotic insult, suggesting central roles for peroxynitrite and membrane lipid peroxidation in oxidative stress-induced apoptosis. Apoptotic insults decreased mitochondrial transmembrane potential and energy charge in control cells but not in cells overexpressing MnSOD, and cyclosporin A and caspase inhibitors protected cells against apoptosis, demonstrating roles for mitochondrial alterations and caspase activation in the apoptotic process. Membrane lipid peroxidation, protein nitration, and neuronal death after focal cerebral ischemia were significantly reduced in transgenic mice overexpressing human MnSOD. The data suggest that mitochondrial superoxide accumulation and consequent peroxynitrite production and mitochondrial dysfunction play pivotal roles in neuronal apoptosis induced by diverse insults in cell culture and in vivo.
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Aβ induces production of superoxide (O2·-), nitric oxide (NO·), and multiple reactive species downstream of these radicals in many cells, including cortical neurons.
“Aβ induces production of O2·- nitric oxide (NO·), and multiple RS downstream of these radicals in many cells, including cortical neurons (Keller et al., 1998; Longo et al., 2000; Keil et al., 2004; Malinski, 2007; Stepanichev et al., 2008; Díaz et al., 2010).”
From The mitochondria-targeted antioxidant MitoQ prevents loss of spatial memory retention and early neuropathology in a transgenic mouse model of Alzheimer’s disease (2011) · cites this paper as Keller et al., 1998
The Discussion links Aβ-induced apoptosis to superoxide and resulting peroxynitrite formation, and the results report increased peroxynitrite-related signals after Aβ exposure in PC6 cells (page unavailable in our copy). The paper does not show that Aβ induces nitric oxide production; it treats an NO-generating compound as a separate insult. The cited Aβ experiments also do not establish the claim specifically in cortical neurons or across many cell types. (LLM, conf=0.87)
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- Authors
- Keller, J. N., Kindy, M. S., Holtsberg, F. W., St. Clair, D. K., Yen, H.-C., Germeyer, A., Steiner, S. M., Bruce-Keller, A. J., Hutchins, J. B., & Mattson, M. P.
- Affiliations
- University of Mississippi Medical Center (US)
- University of Kentucky (US)
- ORCID
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 1998-01-15
- Volume
- 18
- Issue
- 2
- Pages
- 687-697
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC6792529
- OpenAlex
- W2117104323
- Cited by
- 863
- References
- 3
- Citations by year
- 2026: 6 · 2025: 4 · 2024: 6 · 2023: 10 · 2022: 15 · 2021: 7 · 2020: 14 · 2019: 14 · 2018: 12 · 2017: 14 · 2016: 16 · 2015: 26 · 2014: 20 · 2013: 30 · 2012: 24
- FWCI
- 27.54
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Kentucky Spinal Cord and Head Injury Research Trust
- National Institutes of Health
- National Institute on Aging (P01AG005119, AG0 5119)
- National Institute of Neurological Disorders and Stroke (NS29001, R01NS029001, NS 35253, R01NS035253)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
- Keywords
- neuronal apoptosis, peroxynitrite, lipid peroxidation, oxidative stress, mitochondrial dysfunction, focal cerebral ischemia, superoxide, protein nitration, 4-hydroxynonenal, glutathione peroxidase, caspase activation, mitochondrial membrane potential, amyloid-beta, nitric oxide, uric acid, propyl gallate, glutathione, neuroprotection
- MeSH terms
- Animals, Cell Line, Brain Ischemia, Cysteine Endopeptidases, Humans, Intracellular Membranes, Membrane Lipids, Mice, Transgenic, Mitochondria, Neurons, Nitrates, Nitric Oxide, Superoxide Dismutase, Tyrosine, Lipid Peroxidation, Apoptosis, Oxidative Stress, Mice
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