title: Local complement activation in nasal polyposis.
abstract: OBJECTIVE
  The role of the complement system in nasal polyps (CRSwNP) has so far scarcely been studied. Because nasal polyps are characterized by bacterial colonization, and the complement system is an effective defense mechanism, it might be involved in the pathogenesis of CRSwNP. This study was designed to investigate the local and systemic activation of the complement system in CRSwNP versus control mucosa in relation to the local and systemic eosinophilic and neutrophilic inflammation and local plasma exudation.
  
  
  METHODS
  Concentrations of complement factors C3a desArg and C5a desArg, and of albumin, alpha2-macroglobulin, eosinophilic cationic protein, and myeloperoxidase were determined on nasal secretions and serum from 12 CRSwNP patients and 10 control patients. Tissue cryosections were stained for the membrane attack complex (C5b9)
  
  
  RESULTS
  We found a significantly higher concentration of C3a desArg and C5a desArg in nasal secretions from CRSwNP patients compared to controls, whereas the serum levels between the two groups did not differ significantly. Significant correlations were found between C5a desArg and eosinophil cationic protein in nasal secretions. Staining for the membrane attack complex revealed a deposition around blood vessels and the basal membrane exclusively in nasal polyp tissue.
  
  
  CONCLUSIONS
  These data support the hypothesis that, in addition to the adaptive immune responses, the complement system is involved in the pathogenesis of CRSwNP and may contribute to typical features such as edema and granulocytic inflammation.
authors: Upper Airway Research Laboratory, Department of Otorhinolaryngology, Ghent University Hospital, Belgium. thibaut.vanzele@ugent.be
authors: Thibaut
authors: T
authors: Van Zele
authors: Frauke
authors: F
authors: Coppieters
authors: Philippe
authors: P
authors: Gevaert
authors: Gabriele
authors: G
authors: Holtappels
authors: Paul
authors: P
authors: Van Cauwenberge
authors: Claus
authors: C
authors: Bachert
mesh_terms: D000328:Adult; D000368:Aged; D003167:Complement Activation / Q000502:physiology*; D015926:Complement C3a; D015936:Complement C5a / Q000276:immunology; D047150:Eosinophil Cationic Protein / Q000097:blood; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009298:Nasal Polyps / Q000276:immunology*; D009195:Peroxidase / Q000097:blood; D012709:Serum Albumin / Q000032:analysis; D000511:alpha-Macroglobulins / Q000032:analysis
chemical_list: D012709:Serum Albumin; D000511:alpha-Macroglobulins; D015926:Complement C3a; D015936:Complement C5a; D009195:Peroxidase; D047150:Eosinophil Cationic Protein