Objectives: To examine the role of CysLTs in CRS, nasal polyp specimens were obtained from patients with CRS classified into 3 subgroups: those with aspirin-intolerant asthma (CRS-AIA group), those with bronchial asthma (CRS-BA group), and those without asthma (CRS-NA group).
Design: Samples were prepared from the nasal polyps of patients undergoing endoscopic sinus surgery (ESS) at our hospital. The CysLTs were extracted using the C18 Sep-Pak column (Waters Corp, Milford, MA) and quantified using a high-sensitivity competitive EIA kit (Cayman chemical, Ann Arbor, MI) in accordance with the manufacturer's instructions. The expressions of the CysLT
1 and CysLT
2 receptors in the nasal polyp specimens were evaluated by immunohistochemistry.
Subjects: Twenty-seven patients who had undergone ESS.
Results: The concentrations of the CysLTs were significantly higher in the polyps obtained from the CRS-AIA group than in those obtained from the CRS-BA or CRS-NA group. There were no significant differences in the nasal polyp CysLT concentrations between the CRS-BA group and CRS-NA group. Expressions of both the CysLT
1 and CysLT
2 receptors were significantly more intense? stronger? higher? in the specimens from the CRS-AIA group than in those from either of the other two groups, while there were no significant differences in the expression levels of the CysLT
1 and CysLT
2 receptors in the nasal mucosal inflammatory cells.
Conclusions: These results suggest that CysLTs may play prominent roles in the pathogenesis of aspirin-intolerant asthma associated with CRS.
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