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Related Experiment Videos

Molecular analysis of IgA in multiple sclerosis.

P K Coyle1

  • 1Department of Neurology, SUNY, Stony Brook 11794.

Journal of Neuroimmunology
|April 1, 1989
PubMed
Summary

Multiple sclerosis (MS) patients show altered molecular forms of Immunoglobulin A (IgA) in tears and saliva, indicating potential mucosal inflammation. These changes suggest impaired mucosal barriers in MS.

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Area of Science:

  • Immunology
  • Neuroimmunology
  • Gastroenterology

Background:

  • Immunoglobulin A (IgA) is crucial for mucosal immunity and antiviral defense, acting as the primary antibody in external secretions.
  • Alterations in mucosal immunity are implicated in the pathogenesis of multiple sclerosis (MS), a chronic neurological autoimmune disease.

Purpose of the Study:

  • To investigate potential differences in the molecular forms and levels of IgA in external secretions (tears and parotid saliva) of multiple sclerosis (MS) patients compared to healthy controls.
  • To explore the implications of observed IgA changes in MS regarding mucosal inflammation and barrier function.

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) and immunoblot techniques were employed.
  • Tears and parotid saliva samples were collected from 21 MS patients and 19 normal controls.
  • Analysis focused on absolute IgA levels, molecular forms (monomeric vs. polymeric), IgA subclasses, and secretory component.

Main Results:

  • No significant differences in absolute IgA levels were found between MS patients and controls.
  • A significantly higher prevalence of monomeric IgA was observed in MS patient tears (52%) and parotid saliva (45%) compared to controls.
  • Secretory component staining was decreased in MS patients' secretions, suggesting potential alterations in mucosal barrier integrity.

Conclusions:

  • MS patients exhibit distinct changes in the molecular form of IgA in tears and saliva, characterized by increased monomeric IgA.
  • These findings suggest localized mucosal inflammation and potentially impaired mucosal barriers in individuals with MS.
  • Altered mucosal barriers in MS may influence susceptibility to infections, environmental antigen processing, and lymphocyte activation.

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