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Predominant role of catalase in the disposal of hydrogen peroxide within human erythrocytes
Open accessAbstract
Purified enzymes were mixed to form a cell-free system that simulated the conditions for removal of hydrogen peroxide within human erythrocytes. Human glutathione peroxidase disposed of hydrogen peroxide (H2O2) at a rate that was only 17% of the rate at which human catalase simultaneously removed hydrogen peroxide. The relative rates observed were in agreement with the relative rates predicted from the kinetic constants of the two enzymes. These results confirm two earlier studies on intact erythrocytes, which refuted the notion that glutathione peroxidase is the primary enzyme for removal of hydrogen peroxide within erythrocytes. The present findings differ from the results with intact cells, however, in showing that glutathione peroxidase accounts for even less than 50% of the removal of hydrogen peroxide. A means is proposed for calculating the relative contribution of glutathione peroxidase and catalase in other cells and species. The present results raise the possibility that the major function of glutathione peroxidase may be the disposal of organic peroxides rather than the removal of hydrogen peroxide.
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“they have an increased level of antioxidant enzymes and enhanced glucose flux into the pentose phosphate pathway (ppp)60,61 to generate more NADPH. In a normal setting, this protects erythrocytes from high-dose ascorbate.”
From Targeting cancer vulnerabilities with high-dose vitamin C (2019) · cites this paper as [60]
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Metadata
- Authors
- Gaetani, G., Ferraris, A., Rolfo, M., Mangerini, R., Arena, S., & Kirkman, H.
- Affiliations
- University of Genoa (IT)
- Division of Hematological Oncology, Istituto Nazionale per la Ricerca sul Cancro, University of Genoa, Italy.
- Venue
- Blood
- Publisher
- American Society of Hematology
- Published
- 1996-02-15
- Volume
- 87
- Issue
- 4
- Pages
- 1595-1599
- ISSN
- 0006-4971 (ISSN-L)
- 1528-0020
- OpenAlex
- W160949418
- Cited by
- 296
- References
- 21
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 12 · 2023: 12 · 2022: 13 · 2021: 11 · 2020: 15 · 2019: 23 · 2018: 14 · 2017: 13 · 2016: 15 · 2015: 17 · 2014: 25 · 2013: 15 · 2012: 17
- FWCI
- 1.64
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Blood (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
- Health Sciences › Medicine › Biochemistry (medical) › Antioxidant Activity and Oxidative Stress
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glutathione Transferases and Polymorphisms
- Keywords
- catalase, glutathione peroxidase, hydrogen peroxide, erythrocytes, cell-free system, enzyme kinetics, antioxidant enzymes
- MeSH terms
- Catalase, Cell-Free System, Erythrocytes, Gluconates, Glutathione, Glutathione Peroxidase, Humans, Hydrogen Peroxide, NAD
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