Age-related losses of cognitive function and motor skills in mice are associated with oxidative protein damage in the brain
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M J Forster1, A Dubey, K M Dawson
1Department of Pharmacology, University of North Texas Health Science Center, Fort Worth, 76107, USA.
Abstract:
The hypothesis that age-associated impairment of cognitive and motor functions is due to oxidative molecular damage was tested in the mouse. In a blind study, senescent mice (aged 22 months) were subjected to a battery of behavioral tests for motor and cognitive functions and subsequently assayed for oxidative molecular damage as assessed by protein carbonyl concentration in different regions of the brain. The degree of age-related impairment in each mouse was determined by comparison to a reference group of young mice (aged 4 months) tested concurrently on the behavioral battery. The age-related loss of ability to perform a spatial swim maze task was found to be positively correlated with oxidative molecular damage in the cerebral cortex, whereas age-related loss of motor coordination was correlated with oxidative molecular damage within the cerebellum. These results support the view that oxidative stress is a causal factor in brain senescence. Furthermore, the findings suggest that age-related declines of cognitive and motor performance progress independently, and involve oxidative molecular damage within different regions of the brain.
Insights
Oxidative stress causes age-related cognitive and motor decline in mice. This damage affects the brain
Area of Science:
- Neuroscience
- Aging Research
- Oxidative Stress Biology
Background:
- Cognitive and motor functions naturally decline with age.
- Oxidative molecular damage is a proposed mechanism for age-associated functional impairments.
- Understanding these mechanisms is crucial for developing interventions against aging-related deficits.
Purpose of the Study:
- To investigate the causal link between oxidative molecular damage and age-associated cognitive and motor impairments in mice.
- To determine if specific brain regions are differentially affected by oxidative stress in aging.
- To explore the independent progression of cognitive versus motor decline in senescence.
Main Methods:
- A blind study design was employed using senescent (22-month-old) and young (4-month-old) mice.
- Mice underwent a battery of behavioral tests assessing motor and cognitive functions.
- Oxidative molecular damage was quantified by measuring protein carbonyl concentration in brain regions (cerebral cortex, cerebellum).
Main Results:
- Age-related decline in spatial learning (swim maze) positively correlated with oxidative damage in the cerebral cortex.
- Age-related loss of motor coordination correlated with oxidative damage in the cerebellum.
- Cognitive and motor performance declines showed independent progression linked to distinct brain regions.
Conclusions:
- Oxidative stress is a significant causal factor in brain senescence and associated functional impairments.
- Cognitive and motor deficits during aging appear to develop independently.
- Targeting oxidative molecular damage in specific brain regions may mitigate age-related functional decline.