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Epithelial SERPINB10, a novel marker of airway eosinophilia in asthma, contributes to allergic airway inflammation.
Serine peptidase inhibitor, clade B, member 10 (SERPINB10) expression is increased in IL-13-stimulated human bronchial epithelial cells and in a murine model of allergic airway inflammation. However, the role of SERPINB10 in asthma remains unknown. We examined the association between epithelial SERPINB10 expression and airway eosinophilia in subjects with asthma and the role of Serpinb10 in allergic airway inflammation in animal model. Epithelial SERPINB10 mRNA and protein expression were markedly increased in subjects with asthma ( n = 60) compared with healthy controls ( n = 25). Epithelial SERPINB10 mRNA levels were significantly correlated with airway hyperresponsiveness (AHR), and three parameters reflecting airway eosinophilia including the percentage of sputum eosinophils, the number of eosinophils in bronchial submucosa, and fraction of exhaled nitric oxide in subjects with asthma. Moreover, epithelial SERPINB10 expression was strongly correlated with the epithelial gene signature ( CLCA1, POSTN and SERPINB2) for type 2 status. In normal human bronchial epithelial cells cultured at air-liquid interface, knockdown of SERPINB10 suppressed IL-13-stimulated periostin (encoded by POSTN) and CCL26 (eotaxin-3) expression by inhibiting the activation of p38 MAPK. Epithelial CCL26 mRNA levels were correlated with SERPINB10 expression in subjects with asthma. Airway knockdown of Serpinb10 alleviated AHR, airway eosinophilia and the expression of periostin and Ccl26 in a murine model of allergic airway disease. Taken together, epithelial SERPINB10 is a novel marker for airway eosinophilia in asthma. Epithelial SERPINB10 contributes to allergic airway eosinophilic inflammation, at least in part, by regulating the expression of periostin and CCL26.
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