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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Frailty and Brain Myelin Across Adulthood: Multimodal MRI Insights From the BLSA
Mustapha Bouhrara1, Zhaoyuan Gong1, Toshiko Tanaka1
1National Institute on Aging, NIH, Baltimore, Maryland, USA.
Aging Cell
|April 14, 2026
Summary
Frailty is linked to reduced white matter myelin content and integrity across the adult lifespan. Advanced MRI reveals myelin degradation as a potential neurobiological basis for frailty.
Area of Science:
- Neuroscience
- Gerontology
- Biomedical Imaging
Background:
- Frailty, a state of reduced resilience, has unclear neurobiological underpinnings.
- White matter alterations are suspected but poorly understood in frailty.
- Previous studies lacked advanced MRI and focused on older adults.
Purpose of the Study:
- To investigate the association between systemic frailty and white matter (WM) myelin content and integrity.
- To utilize advanced quantitative MRI techniques across the adult lifespan.
Main Methods:
- Recruited 88 participants (aged 22-94) from the Baltimore Longitudinal Study of Aging.
- Employed multicomponent relaxometry MRI to assess myelin water fraction (MWF), R1, and R2.
- Used multiple linear regression and principal component analysis to analyze frailty index (FI) and MRI biomarkers.
Main Results:
- Higher FI scores correlated with significantly lower MWF in most WM regions, particularly long-range tracts.
- R1 and R2 relaxation rates also showed inverse associations with FI, indicating broader WM vulnerability.
- Findings suggest myelin degradation as a neural substrate of frailty.
Conclusions:
- This study provides initial evidence linking frailty to brain myelin alterations across adulthood.
- Advanced quantitative MRI is crucial for detecting early brain vulnerability associated with frailty.
- Myelin degradation is a potential neurobiological mechanism underlying frailty.
