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Related Concept Videos

Complement System01:27

Complement System

The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...

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Comprehensive Autopsy Program for Individuals with Multiple Sclerosis
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Published on: July 19, 2019

Immunoglobulins and complement in postmortem multiple sclerosis tissue.

Michael H Barnett1, John D E Parratt, Eun-Sook Cho

  • 1Department of Medicine, Institute of Clinical Neurosciences, University of Sydney, New South Wales, Australia.

Annals of Neurology
|February 6, 2009
PubMed
Summary

Researchers investigated immune responses in multiple sclerosis (MS) tissue. They found that immunoglobulin G and complement deposits on myelin are nonspecific, but unique microglial nodules may indicate a specific MS biomarker.

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Area of Science:

  • Neuroimmunology
  • Neuropathology

Background:

  • Multiple sclerosis (MS) is a chronic inflammatory demyelinating disease of the central nervous system.
  • The specific immune mechanisms driving MS pathogenesis remain incompletely understood.
  • Investigating the distribution of immunoglobulins and complement in MS tissue is crucial for understanding disease-specific immune responses.

Purpose of the Study:

  • To determine if a distinct, specific immune response exists in multiple sclerosis (MS).
  • To analyze the distribution of immunoglobulins and complement in MS tissue compared to other neurological diseases.
  • To identify potential biomarkers for MS pathogenesis.

Main Methods:

  • Immunohistochemical analysis of autopsy brain and spinal cord tissue from 25 MS patients and 24 controls with other neurological diseases.
  • Detection of immunoglobulins (IgG) and activated complement components (C3d, C9neo).
  • Examination of tissue remote from lesions, areas of active demyelination, and specific cellular structures.

Main Results:

  • Immunoglobulin G and complement deposits on disrupted myelin were found to be nonspecific, present in various neurological conditions including MS and ischemic infarcts.
  • Disease-specific deposits of IgG or complement were identified in other conditions like viral encephalitis, neuromyelitis optica, and Alzheimer's dementia.
  • Unique microglial nodules with activated complement deposits on partly demyelinated axons were observed in normal-appearing white matter specific to MS.

Conclusions:

  • Nonspecific deposition of IgG and complement on myelin in MS lesions does not indicate a distinct pathogenesis or specific variants.
  • The identified microglial nodules represent a potential specific biomarker for MS with pathogenetic significance.
  • Further research into these microglial nodules could elucidate specific MS disease mechanisms.