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Cerebral hypoperfusion: a new pathophysiologic concept in multiple sclerosis?

Miguel D'haeseleer1,2, Stéphanie Hostenbach1, Ilse Peeters1

  • 1Department of Neurology, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Center for Neurosciences, Brussels, Belgium.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
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Summary
This summary is machine-generated.

Multiple sclerosis (MS) involves reduced cerebral blood flow (CBF), not just inflammation. Elevated endothelin-1 may cause this hypoperfusion, impacting axonal health and leading to disability.

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Area of Science:

  • Neuroscience
  • Immunology
  • Radiology

Background:

  • The precise mechanisms driving multiple sclerosis (MS) pathogenesis, particularly axonal degeneration, remain incompletely understood.
  • While autoimmune responses cause demyelination, axonal damage, a key factor in MS disability, is poorly correlated with inflammatory activity.
  • Cerebral hypoperfusion is a consistent finding in MS patients across disease stages.

Purpose of the Study:

  • To investigate the role of cerebral hypoperfusion in multiple sclerosis (MS) pathogenesis.
  • To explore the potential mechanisms behind reduced cerebral blood flow (CBF) in MS.
  • To assess the association between hypoperfusion and MS pathology and symptoms.

Main Methods:

  • Utilized perfusion-weighted imaging studies to assess cerebral blood flow (CBF) in MS patients.
  • Investigated the relationship between reduced CBF and axonal integrity.
  • Examined the role of endothelin-1 in mediating cerebral vasospasm in MS.

Main Results:

  • Widespread cerebral hypoperfusion (reduced CBF) is present in MS patients from early to advanced stages.
  • Reduced CBF in MS is not secondary to axonal loss but linked to elevated endothelin-1 levels.
  • Evidence suggests hypoperfusion correlates with chronic hypoxia, lesion formation, axonal degeneration, cognitive issues, and fatigue.

Conclusions:

  • Cerebral hypoperfusion, potentially mediated by endothelin-1, is a significant factor in MS pathology.
  • Hypoperfusion contributes to axonal degeneration, cognitive dysfunction, and fatigue in MS.
  • Restoring cerebral blood flow (CBF) presents a potential new therapeutic strategy for MS.