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The complement system in infectious mononucleosis.

J A Charlesworth, B A Pussell, L P Roy

Australian and New Zealand Journal of Medicine

|February 1, 1977

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Infectious mononucleosis can activate the complement system, potentially causing complications like anemia and kidney issues. Both classical and alternative complement pathways may be involved in disease and clearing viral infections.

Area of Science:

Immunology
Virology
Nephrology

Background:

Infectious mononucleosis, a viral illness, can lead to various complications.
The complement system is a crucial part of innate immunity, involved in pathogen clearance and inflammation.

Purpose of the Study:

To investigate the role of the complement system in patients with infectious mononucleosis.
To explore the association between complement activation pathways and disease complications.

Main Methods:

Analysis of complement system components in 34 patients with infectious mononucleosis.
Assessment of complement pathway activation (classical and alternative) based on laboratory findings and renal biopsy.

Main Results:

Complement changes indicating classical pathway consumption were observed in uncomplicated cases and those with hemolytic anemia or arthralgia/myalgia.

Related Experiment Videos

A patient with glomerulonephritis showed alternative pathway activation, including C3 splitting and properdin deposition.

Circulating immune complexes are suggested to be common, contributing to disease pathogenesis.

Conclusions:

The complement system, involving both classical and alternative pathways, plays a significant role in infectious mononucleosis and its complications.
Immune complexes are implicated in the pathogenesis of infectious mononucleosis complications.
Both complement pathways might be essential for effectively clearing viral material from the bloodstream.