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Keywords:

  • 12-HETE;
  • Churg-Strauss syndrome;
  • eicosanoids;
  • exhaled breath condensate;
  • vasculitis

Summary

Background

Churg-Strauss syndrome (CSS) shares similarities with asthma and hypereosinophilic syndrome (HES). Eicosanoids – important inflammatory and signaling molecules – are present in exhaled breath condensate (EBC) and broncho-alveolar lavage fluid (BALF).

Objectives

To assess eicosanoid profile both in EBC and BALF of CSS subjects searching for a pattern characteristic of this syndrome.

Methods

EBCs from 23 CSS patients, 30 asthmatics, 12 HES patients and 54 healthy controls (HC) were assessed quantitatively for 19 eicosanoids by a high-performance liquid chromatography - tandem mass spectrometry (HPLC-MS/MS). In addition, in 21 of 23 CSS subjects and in nine asthmatics, eicosanoids were determined in BALF.

Results

EBC from CSS patients showed markedly elevated levels of 12-HETE as compared with other studied groups. BALF was characterized by a significant elevation of 12-HETE and its metabolite 12-tetranor HETE in CSS as compared with asthma. Clinical activity of CSS correlated with 12-HETE and its metabolites levels in BALF, but not in EBC.

Conclusion and Clinical Relevance

CSS is clearly distinguished from bronchial asthma, and HES by a marked increase in 12-HETE concentration in both EBC and BALF. This points to a possible new pathogenic mechanism in CSS and may help in future in establishing the diagnosis of CSS.