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Related Experiment Videos

Sodium channel expression within chronic multiple sclerosis plaques.

Joel A Black1, Jia Newcombe, Bruce D Trapp

  • 1Department of Neurology and Paralyzed Veterans of America/United Spinal Association Neuroscience Research Center, Yale University School of Medicine, New Haven, CT, USA. joel.black@yale.edu

Journal of Neuropathology and Experimental Neurology
|September 7, 2007
PubMed
Summary
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Mechanisms of axonal degeneration in multiple sclerosis (MS) differ between acute and chronic lesions. Acute lesions show axonal injury with coexpression of Nav1.6 and the sodium-calcium exchanger (NCX), while chronic lesions exhibit injury independent of this coexpression.

Area of Science:

  • Neuroscience
  • Pathology
  • Cell Biology

Background:

  • Multiple sclerosis (MS) involves myelin sheath destruction, gliotic scars, and axonal damage, leading to progressive clinical deficits.
  • Axonal loss in chronic MS lesions (
  • slow burn
  • ') significantly contributes to disability accumulation.
  • Mechanisms of axonal degeneration in acute versus chronic MS lesions remain unclear, despite differing microenvironments.

Purpose of the Study:

  • To investigate the expression of sodium channels (Nav1.2, Nav1.6) and the sodium-calcium exchanger (NCX) in chronic MS spinal cord plaques.
  • To determine if axonal degeneration in chronic MS lesions shares mechanisms with acute lesions, particularly regarding coexpression of Nav1.6 and NCX.

Main Methods:

Related Experiment Videos

  • Immunohistochemical examination of chronic MS spinal cord plaques.
  • Analysis of Nav1.2, Nav1.6, sodium-calcium exchanger (NCX), and beta-amyloid precursor protein (beta-APP) expression in demyelinated axons and surrounding glial cells.

Main Results:

  • Nav1.2 was not found on demyelinated axons but was present in reactive astrocytes in chronic lesions.
  • Nav1.6 was detected in a subset of demyelinated axons in chronic lesions, with patchy distribution.
  • Sodium-calcium exchanger (NCX) was absent in demyelinated axons but present in surrounding scar astrocytes.
  • Beta-amyloid precursor protein (beta-APP), a marker of axonal damage, was found in a small percentage of axons, not preferentially associated with Nav1.6.

Conclusions:

  • Axonal degeneration mechanisms differ between acute and chronic MS lesions.
  • In acute MS lesions, axonal injury is linked to Nav1.6 and NCX coexpression.
  • In chronic MS lesions, axonal degeneration appears to occur independently of Nav1.6 and NCX coexpression on axons.