PMID: 9187919Jan 1, 1997Paper

Role of complement in inflammation and injury in the nervous system

Experimental and Clinical Immunogenetics
B P MorganS J Piddlesden

Abstract

The complement (C) system plays important roles in host defence but activation at inappropriate sites or to an excessive degree can cause host tissue damage. C has been implicated as a factor in the causation or propagation of tissue injury in numerous diseases. The brain is an immunologically isolated site, sheltered from circulating cells and proteins of the immune system; nevertheless, there is a growing body of evidence implicating C in numerous brain diseases. In this brief article we review the evidence suggesting a role for C in diseases of the central and peripheral nervous system and discuss the possible sources of C at these sites. Some brain cells synthesise C and also express specific receptors; some are exquisitely sensitive to the lytic effects of C. The evidence suggests that C synthesis and activation in the brain are important in immune defence at this site but may also play a role in brain disease.

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