Th9 cells elicit bronchial hyperresponsiveness through eosinophil-independent mechanisms

Th9 cells induce steroid-resistant bronchial hyperresponsiveness in mice.

BACKGROUND Reduced responsiveness to corticosteroid therapy is a major problem for patients with severe asthma. Although Th9 cells, along with Th2 cells, facilitate antigen-induced airway eosinophilia and bronchial hyperresponsiveness (BHR), the sensitivity of Th9 cell-mediated responses to steroid therapy remains unknown. In this study, we investigated the effect of dexamethasone (Dex) on anti...

Bronchial hyperresponsiveness decreases through childhood.

Limited knowledge exists about development of bronchial hyperresponsiveness (BHR) through adolescence. We aimed to assess changes in and risk factors for BHR in adolescence. From a Norwegian birth cohort 517 subjects underwent clinical examinations, structured interviews and methacholine challenges at age 10 and 16. BHR was divided into four categories: no BHR (cumulative methacholine dose requ...

Allergen-induced Bronchial Hyperresponsiveness

Bradykinin (BK) is a peptide mediator generated at sites of inflammation and its effects are mediated through constitutively expressed B 2 receptor or through induction of B 1 receptors. We examined the role of these receptors in bronchial hyperresponsiveness (BHR). Brown-Norway rats sensitized with ovalbumin (OA) and Al(OH) 3 intraperitoneally, were exposed 3 wk later to either saline or OA ae...

Bronchial Hyperresponsiveness in Asthma*

Measurement ofnonspecific bronchial hyperresponsiveness remains largely a research tool in asthma, and its usefulness in the assessment and management of asthma is poorly defined. We StUdied the relationship of bronchial hyperresponsiveness to the clinical severity of asthma in 54 asthmatic subjects. In order to find out whether measurement of bronchial hyperresponsiveness could be used to pred...

Resolution of Bronchial Hyperresponsiveness