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Summary
This summary is machine-generated.

Women generally have more white matter hyperintensities (WMH) and severe WMH pathophysiology than men. However, men exhibit worse orientation dispersion in posterior WMHs, indicating nuanced sex-specific differences in brain aging.

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Area of Science:

  • Neuroimaging
  • Neuropathology
  • Brain Aging

Background:

  • White matter hyperintensity (WMH) pathophysiology varies regionally and involves edema, inflammation, demyelination, and axonal degeneration.
  • Sex differences in WMH volume are notable, with women exhibiting a higher burden from midlife, potentially linked to estrogen reduction during menopause.
  • A detailed characterization of spatial WMH pathophysiological patterns across sexes is currently lacking.

Purpose of the Study:

  • To investigate and characterize sex-specific spatial patterns of white matter hyperintensity (WMH) pathophysiology.
  • To utilize high-resolution microstructural magnetic resonance imaging (MRI) to differentiate WMH pathologies between sexes.

Main Methods:

  • Employed microstructural MRI on a large UK Biobank cohort (n=32,526) to derive fluid-, fiber-, myelin-, and iron-sensitive markers.
  • Calculated age- and sex-specific normative values for white matter microstructure at voxel-level resolution.
  • Applied spectral clustering to identify spatial WMH pathophysiology clusters (periventricular, posterior, anterior) and analyzed sex differences using linear models.

Main Results:

  • Females generally exhibited higher WMH volumes and more severe WMH pathophysiology.
  • Males showed higher WMH volume and worse orientation dispersion (OD) pathophysiology specifically in posterior WMHs.
  • When controlling for WMH volume, females displayed significant effects in periventricular and posterior regions, while OD showed a significant male effect in the periventricular region.

Conclusions:

  • WMH pathophysiology exhibits nuanced, sex-specific spatial differences.
  • Females have more WMHs but similar anterior WMH pathophysiology compared to males.
  • Males present with higher WMH volumes but reduced posterior WMH pathophysiology compared to females.