Asthma Clinical Trial
Official title:
Asthma With Bronchial Hypersecretion: Expression of Mucins and Toll-like Receptors in Sputum and Blood
This study raises two main hypotheses: 1) Asthmatics patients who present with bronchial hypersecretion differ phenotypically from asthmatic patients without hypersecretion and 2) mucins in asthmatic patients with hypersecretion of bronchial mucus and the expression of TLRs differ from non-mucus hypersecretory asthmatics patients.
Asthma with bronchial hypersecretion is a type of asthma poorly studied. Its pathogenesis is
not well understood but probably is related to the innate impaired immunity, particularly
with "toll-like receptors" (TLR) and secretory mucin (MUC).
Objectives 1) Define the clinical and inflammatory phenotype of asthma with bronchial
hypersecretion of mucus. 2) Compare the type of mucin present in induced sputum (IS) of
patients with and without bronchial hypersecretion. 3) Determine the expression of TLRs in
the IS and in the peripheral blood of asthmatics with and without bronchial hypersecretion.
Method: Cross-sectional study which included 43 asthmatic patients, 19 with and 24 without
bronchial hypersecretion. All patients underwent the following: IS, spirometry, fractional
exhaled nitric oxide (FeNO), prick test, total IgE and blood albumin. Analysis of mucins
(MUC2, MUC5AC, MUC5B and MUC1) was determined by ELISA and expression of TLR2 and TLR4 by
flow cytometry. The level of asthma control was determined by the asthma control test
questionnaire (ACT) and quality of life was assessed by the MiniAQLQ questionnaire.
;
Observational Model: Cohort, Time Perspective: Cross-Sectional
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