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Age dependence of the T2-weighted MRI signal in brain structures of a prosimian primate (Microcebus murinus)
Abstract:
Mouse lemurs (Microcebus murinus) are prosimian primates described to be convenient models of brain aging. We observed very high correlations between the T2-weighted magnetic resonance imaging (MRI) signal decrease and the natural logarithm of age in the basal ganglia. The correlation coefficient was higher for the pallidum (r = 0.95, P < 0.0001) than for other structures. We suggest that the ratio of the pallidum intensity divided by the amygdala and temporal lobe intensity should be a valuable non-invasive marker of age and of cerebral aging. It should be particularly useful for the non-invasive assessment of interventions and drugs that affect the aging process.
Insights
Mouse lemurs show strong correlations between MRI signal decrease in the basal ganglia and aging. A ratio of pallidum to amygdala/temporal lobe intensity may serve as a non-invasive marker for brain aging.
Area of Science:
- Neuroscience
- Primatology
- Medical Imaging
Background:
- Mouse lemurs (Microcebus murinus) are established models for studying brain aging.
- Understanding age-related changes in the brain is crucial for developing interventions.
Purpose of the Study:
- To identify non-invasive imaging markers for assessing brain aging in mouse lemurs.
- To evaluate the utility of specific brain region signal intensities in magnetic resonance imaging (MRI) as age indicators.
Main Methods:
- Utilized T2-weighted magnetic resonance imaging (MRI) to analyze brain structures in mouse lemurs.
- Correlated signal intensity changes in the basal ganglia with the natural logarithm of age.
- Calculated correlation coefficients for various brain structures, focusing on the pallidum.
Main Results:
- Observed a significant correlation between T2-weighted MRI signal decrease and age in the basal ganglia.
- The pallidum exhibited the highest correlation (r = 0.95, P < 0.0001).
- Proposed a ratio of pallidum intensity to amygdala and temporal lobe intensity as a potential aging biomarker.
Conclusions:
- The pallidum's T2-weighted MRI signal intensity is a sensitive indicator of age in mouse lemurs.
- The suggested intensity ratio offers a promising non-invasive method for assessing cerebral aging.
- This marker could facilitate the evaluation of anti-aging interventions and drugs.