Correlation of the BMP-4 and BMP-7 Proteins Concentration and Expression in Response to a Specific and Non-Specific Trigger in Asthma

Introduction: Asthma is characterized by persistent inflammation, airway hypersensitivity and remodelling. Bone Morphogenetic Proteins belong to the Transforming Growth Factor Superfamily and have a similar signalling transduction pathway and common co-mediating protein. However, the BMPs role in the remodelling remains unclear; they appear to be involved in the airway inflammation and fibrogenesis process. Material and Methods: 60 patients with asthma and 48 healthy volunteers were recruited for the study. Blood samples were collected before, 1 h, 24 and 48 h after the allergen or the methacholine challenge test. Evaluation of BMP-4 and BMP-7 serum concentration and expression was performed using ELISA and real time PCR methods, respectively. Results: Statistically significant differences in BMP-7 concentration between healthy controls and asthmatics before the chal-lenge were noted. We found two statistically significant correlations: between the basal BMP-4 concentration and the FEV1(L) raw value and FEV1/FVC(%) index. We did not observe significant changes in the gene expression of BMP-4 and BMP-7 in different time points. Conclusions: Observed differences in BMP-7 concentration between asthmatic and healthy groups and correlations between BMP-4 concentration and some lung function test values may indicate the role of the BMPs in the etiopathogenesis of asthma. The unique characteristic of our study is the evaluation of BMPs serum levels, not in the bronchial epithelium.