Total antioxidant capacity is impaired in different structures from aged rat brain

Area of Science:

• Neuroscience
• Biochemistry
• Gerontology

Background:

• Oxidative stress is implicated in brain aging.
• The balance between free radicals and antioxidant systems is crucial for neuronal health.

Purpose of the Study:

• To investigate age-related changes in oxidative stress markers and antioxidant capacity in different rat brain regions.
• To explore the relationship between free radical levels and antioxidant system activity during aging.

Main Methods:

• Assessed free radical levels using 2',7'-dichlorofluorescein diacetate.
• Measured lipid peroxidation and carbonyl content.
• Determined antioxidant enzyme activities (superoxide dismutase, catalase, glutathione peroxidase).
• Evaluated total antioxidant capacity (potential and reactivity) in cortex, striatum, hippocampus, and cerebellum of young, mature, and old rats.

Main Results:

• Aged rats exhibited elevated free radical levels in the striatum, cerebellum, and hippocampus.
• Lipid peroxidation increased with age in the hippocampus and cerebral cortex.
• Antioxidant enzyme activity varied by region: high superoxide dismutase and low catalase in the cerebellum; decreased catalase in the striatum; diminished glutathione peroxidase in the hippocampus.
• Total antioxidant capacity decreased in the hippocampus, striatum, and cerebral cortex of aged rats.

Conclusions:

• Aging disrupts the balance between pro-oxidants and antioxidants in the rat brain.
• Cerebral regions display distinct age-related oxidative stress profiles.
• Impaired antioxidant defenses may increase susceptibility to neurodegeneration in aging brains.