Budesonide attenuates airway remodeling and the expression of TGF-β1 in bronchoalveolar lavage fluid and lung tissue of asthmatic rats / 临床儿科杂志

ABSTRACT

Objectives To explore the effects of budesonide (BUD) on airway remodeling and the levels of transforming growth factor-β1 (TGF-β1) in bronchoalveolar lavage fluid (BALF) and its expression in lung tissue of asthmatic rats. To provide a theoretical basis for the intervention and treatment of asthma. Methods Sixty healthy adult male Wistar rats were randomly divided into 3 groups control group, asthma model group and BUD treated group, 20 rats in each group. A rat asthma model was established by ovalbumin (OVA) challenging. BUD treated group was treated with inhaled BUD 1 mg/kg in 30 min per serving every other day for two weeks. After OVA challenge finished, the rats were anesthetized and sacrificed for BALF and lung tissue collection. The level of TGF-β1 in BALF was measured by enzyme-linked immunosorbent assay. TGF-β1 expression and collagen deposition in the lung tissue were tested with immunohistochemical determination and Masson stain respectively. The computer image analysis system was used for measuring respiratory bronchiole smooth muscle thickness (μm) and the extent of epithelial damage score and other indicators of airway remodeling. Results Compared with that in the control group, TGF-β1 in BALF and lung tissue of asthma model group increased and were correlated significantly with the indicators of airway remodeling (P < 0.01) ;while that of BUD treated group reduced statistically significant than model group (P < 0.05). Pathology examination on asthma rat airway epithelial tissue showed the thickness of airway smooth muscle, the airway deposition of collagen in BUD treated group reduced obviously than asthma model group. Conclusions The expression of TGF-β1 in the rat asthma airway worsens the airway remodeling. The effects of BUD on ameliorating the progression of airway remodeling may be partially made by reducing the expression of TGF-β1. (J Clin Pediatr,2010,28(2)173-177)