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Brain iron deposits and lifespan cognitive ability
Maria Del C Valdés Hernández1,2, Stuart Ritchie3,4, Andreas Glatz5
1Department of Neuroimaging Sciences, Centre for Clinical Brain Sciences, University of Edinburgh, 49 Little France Crescent, Chancellor's Building, Edinburgh, EH16 4SB, UK. M.Valdes-Hernan@ed.ac.uk.
Age (Dordrecht, Netherlands)
|September 18, 2015
Summary
Brain iron deposits are linked to declines in fluid intelligence, processing speed, and memory in older adults. These findings suggest iron accumulation may indicate small vessel disease impacting cognitive function.
Area of Science:
- Neuroscience
- Cognitive Aging
- Medical Imaging
Background:
- Brain iron deposits are associated with cognitive decline and neurodegenerative diseases in older adults.
- The underlying mechanisms linking brain iron to cognitive status remain largely unclear.
- Understanding these associations is crucial for identifying potential biomarkers and therapeutic targets.
Purpose of the Study:
- To investigate the relationship between regional brain iron deposits and cognitive abilities (fluid intelligence, processing speed, memory) in older individuals.
- To explore whether these associations differ across the lifespan.
- To determine if brain iron deposit associations with cognition are independent of vascular factors and white matter hyperintensities.
Main Methods:
- Utilized a large sample (n=662) of individuals with a mean age of 73 years.
- Employed automated and semi-automated methods to quantify iron deposits in various brain regions (corpus striatum, white matter, thalamus, brainstem, cortex).
- Assessed cognitive abilities including fluid intelligence, processing speed, and memory, alongside brain tissue volume and white matter hyperintensities (WMH).
Main Results:
- 72.8% of the sample exhibited brain iron deposits.
- A significant negative correlation was found between total iron deposit volume and all three cognitive factors in later life (mean r=-0.165).
- No association was observed between iron deposits and childhood intelligence (r=0.043).
- These associations persisted after controlling for vascular health factors and were distinct from WMH effects.
- Iron deposits showed relevance to cognitive ability primarily in older age.
Conclusions:
- Brain iron deposits are negatively associated with cognitive abilities in later life, independent of vascular factors.
- Iron accumulation may serve as an indicator of small vessel disease impacting neural networks crucial for higher cognitive functions.
- The findings highlight the importance of brain iron in understanding cognitive aging and associated pathologies.
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