No evidence for increased brain iron deposition in patients with ischemic white matter disease

Area of Science:

• Neuroimaging
• Neurology
• Biomedical Science

Background:

• Iron accumulation in deep gray matter (DGM) is observed in multiple sclerosis (MS), a condition primarily affecting white matter (WM).
• The relationship between the severity of ischemic white matter hyperintensities (WMH) and DGM iron concentration in MS remains unclear.

Purpose of the Study:

• To investigate whether increased white matter damage, indicated by WMH severity, correlates with elevated iron concentration in DGM structures in MS patients.
• To explore the role of iron accumulation in ischemic small vessel disease within the context of MS.

Main Methods:

• Quantitative R2* relaxometry using 3-Tesla magnetic resonance imaging (MRI) was employed.
• WMH severity was assessed in 61 patients with acute transient neurological symptoms.
• R2* rates in DGM structures were measured and correlated with WMH volume and severity.

Main Results:

• No significant difference in DGM R2* rates was found between patients with severe WMH and those with mild or no WMH.
• Globus pallidum R2* rates were paradoxically lower in patients with severe WMH.
• WMH volume did not correlate with R2* levels in any analyzed DGM structures.

Conclusions:

• White matter damage alone does not appear to cause increased iron deposition in the deep gray matter in multiple sclerosis.
• These findings suggest that iron accumulation may not play a significant role in the pathogenesis of ischemic small vessel disease in MS.