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Class II antigen expression in peripheral neuropathies.

G W Mitchell1, G S Williams, E P Bosch

  • 1Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City 52242.

Journal of the Neurological Sciences
|April 1, 1991
PubMed
Summary
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Class II antigen expression increased on Schwann cells in chronic demyelinating polyradiculoneuropathy (CIDP) and some other neuropathies. This finding may indicate immune tolerance breakdown but isn't a specific diagnostic marker.

Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Class II antigen expression is crucial in immune responses.
  • Its role in peripheral neuropathies, particularly Schwann cells, requires further investigation.

Purpose of the Study:

  • To investigate the expression of class II antigen in sural nerve biopsies from patients with various peripheral neuropathies.
  • To compare class II antigen expression patterns between immune-mediated and non-immune-mediated neuropathies.

Main Methods:

  • Sural nerve biopsies were analyzed for class II antigen expression using immunohistochemistry.
  • Patients included those with chronic demyelinating polyradiculoneuropathy (CIDP), other neuropathies, and healthy controls.
  • Expression levels were correlated with clinical variables and cerebrospinal fluid (CSF) protein levels.

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Main Results:

  • A significant increase in class II antigen expression on Schwann cells was observed in CIDP patients.
  • Similar marked Schwann cell class II expression was found in diabetic neuropathy, monoclonal gammopathy-associated neuropathies, and hereditary sensory and autonomic neuropathy type 1.
  • In controls and other non-immune neuropathies, class II expression was primarily on endothelial and perineurial cells.
  • Increased endoneurial class II expression correlated with elevated CSF protein levels.

Conclusions:

  • Elevated endoneurial class II antigen expression on Schwann cells in certain neuropathies may suggest a breakdown in immunological tolerance.
  • However, the overlap in expression patterns with non-immune neuropathies precludes its use as a definitive diagnostic marker for dysimmune neuropathies.