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Vesicular removal by oligodendrocytes of membrane attack complexes formed by activated complement
N J Scolding1, B P Morgan, W A Houston
1Section of Neurology, University of Wales College of Medicine, Heath Park, Cardiff, UK.
Nature
|June 22, 1989
Summary
Oligodendrocyte injury from complement activation is reversible, with cells releasing vesicles. Similar vesicles in multiple sclerosis patients suggest this mechanism contributes to myelin damage in vivo.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Oligodendrocytes are crucial for myelin synthesis and maintenance in the central nervous system.
- Demyelinating diseases like multiple sclerosis involve myelin injury, with immune mechanisms and complement playing a role.
- Previous work showed antibody-independent complement activation on oligodendrocyte surfaces.
Purpose of the Study:
- To investigate the reversibility of oligodendrocyte injury induced by complement activation.
- To identify the mechanism of recovery following complement-mediated oligodendrocyte damage.
- To explore the relevance of these findings to multiple sclerosis pathogenesis.
Main Methods:
- In vitro studies of oligodendrocyte development and response to complement.
- Analysis of vesicle release from injured oligodendrocytes.
- Morphological and immunochemical characterization of vesicles.
- Comparison of in vitro vesicles with those found in cerebrospinal fluid.
Main Results:
- Oligodendrocyte injury mediated by complement activation in vitro is reversible.
- Cellular recovery involves the release of vesicles enriched with the membrane attack complex.
- Identical vesicles were detected in the cerebrospinal fluid of multiple sclerosis patients.
Conclusions:
- Reversible complement-mediated injury contributes to oligodendrocyte damage.
- The release of membrane attack complex-enriched vesicles is a key recovery mechanism.
- These findings suggest a novel pathway for myelin damage in multiple sclerosis.