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The evidence for hypoperfusion as a factor in multiple sclerosis lesion development.

Bernhard H J Juurlink1

  • 1Department of Anatomy & Cell Biology, University of Saskatchewan, Saskatoon, SK, Canada S7N 5E5 ; College of Medicine, Alfaisal University, Riyadh 11533, Saudi Arabia.

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Hypoxia contributes to early multiple sclerosis (MS) lesions by reducing white matter blood flow. Genetic factors influence lesion development, and treating venous insufficiency may restore perfusion and function.

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Area of Science:

  • Neurology
  • Vascular Biology
  • Pathophysiology

Background:

  • Hypoxia (oxygen deprivation) is increasingly recognized as a factor in early multiple sclerosis (MS) lesion development.
  • Evidence includes elevated hypoxia-inducible factors and genes in MS lesions and adjacent white matter.
  • Reduced white matter blood flow correlates with increased lesion probability.

Purpose of the Study:

  • To explore the role of hypoxia and hypoperfusion in the pathogenesis of early MS lesions.
  • To investigate the interplay between vascular factors, genetic predisposition, and MS lesion formation.
  • To propose considerations for clinical trials involving vascular interventions in MS.

Main Methods:

  • Review of evidence linking hypoxia-inducible factors and gene expression to MS lesions.
  • Analysis of studies showing reduced white matter perfusion in MS patients.
  • Examination of the potential causes of hypoperfusion, including venous and arterial factors.

Main Results:

  • Increased hypoxia-inducible factor-1 α and related gene expression observed in MS lesions and normal-appearing white matter (NAWM).
  • Significant reduction (50%) in blood flow through NAWM, with lowest flow areas showing highest lesion development probability.
  • Hypoperfusion may stem from decreased arterial supply or restricted venous return, potentially linked to chronic cerebrospinal venous insufficiency (CCSVI).

Conclusions:

  • Hypoxia is a significant precipitating factor in early MS lesion formation.
  • Genetic factors likely mediate individual susceptibility to MS-like lesions following hypoxemic insults.
  • Clinical trials for vascular interventions in MS should assess impacts on white matter perfusion and functional recovery, considering both venous and arterial contributions.