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Related Experiment Videos

Cytolytic complement activity in otitis media with effusion.

M Närkiö-Mäkelä1, S Meri

  • 1Department of Bacteriology and Immunology, Haartman Institute, University of Helsinki, Finland.

Clinical and Experimental Immunology
|July 27, 2001
PubMed
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Otitis media with effusion involves chronic middle ear inflammation. Complement activation, particularly the terminal complement complexes, plays a key role in this inflammatory process.

Area of Science:

  • Immunology
  • Otolaryngology
  • Molecular Biology

Background:

  • Otitis media with effusion (OME) is a persistent middle ear inflammation.
  • Middle ear effusion (MEE) samples from children with OME were analyzed.

Purpose of the Study:

  • To investigate the role of complement system activation in OME pathogenesis.
  • To identify factors contributing to complement activation and regulation in MEE.

Main Methods:

  • Analysis of cytolytic activity and complement-mediated lysis in MEE samples.
  • Enzyme immunoassay to detect terminal complement complexes (TCC).
  • Western blotting to identify properdin and CD59 in MEE.

Main Results:

  • Thirteen of 38 MEE samples showed direct hemolytic activity; 27 enhanced serum-initiated lysis.

Related Experiment Videos

  • High levels of TCC (mean 34.1 microg/ml) indicated terminal complement activation.
  • Properdin was identified in MEE, potentially promoting complement activation.
  • Active CD59 was detected, possibly regulating cytotoxicity.

    • Conclusions:

    • Intense complement activation, including terminal pathways, sustains middle ear inflammation in OME.
    • Properdin may accelerate complement pathways, while CD59 might regulate local cytotoxicity.
    • Complement activation poses a threat to the middle ear epithelium in OME.