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[Antioxidative abilities during aging]
Agnieszka Augustyniak1, Elzbieta Skrzydlewska
1Zakład Chemii Nieorganicznej i Analitycznej Akademii Medycznej w Białymstoku.
Postepy Higieny I Medycyny Doswiadczalnej (Online)
|April 13, 2004
Summary
Biological aging increases reactive oxygen species (ROS) and oxidized molecules. The body
Area of Science:
- Biochemistry
- Gerontology
- Cell Biology
Context:
- Aging is characterized by increased cellular reactive oxygen species (ROS) and oxidized biomolecules.
- Organisms possess adaptive antioxidant defense systems, categorized as enzymatic and non-enzymatic.
- Antioxidant enzyme activity (e.g., SOD, CAT, GSH-Px) varies with age, influenced by factors like genetics and tissue type.
Purpose:
- To review the role of antioxidants in biological aging.
- To explore the impact of aging on enzymatic and non-enzymatic antioxidant systems.
- To discuss the influence of age-related changes in antioxidant levels on cellular health.
Summary:
- Cellular aging correlates with elevated ROS and oxidized biomolecules, necessitating robust antioxidant defenses.
- Antioxidant enzymes' activity declines with age due to oxidative modification, though some enzyme activity may increase adaptively.
- Reduced glutathione (GSH) levels and altered plasma protein concentrations (albumin, ferritin, transferrin, caeruloplasmin) contribute to aging-related oxidative stress.
- Exogenous antioxidants from diet, such as vitamins E, C, A, and beta-carotene, show variable age-dependent levels.
Impact:
- Understanding these age-related shifts in antioxidant systems is crucial for developing interventions against oxidative stress.
- This knowledge can inform strategies to mitigate age-associated diseases driven by oxidative damage.
- Highlights the complex interplay between aging, oxidative stress, and the body's defense mechanisms.