Abstract
ObjectivesPeroxisome proliferator activated receptor-gamma (PPAR-) has been shown to play an important role in the control of immunological and inflammatory responses. This study aims at investigating the potential role of rosiglitazone, a strong PPAR- agonist in a murine model of bronchial asthma.
MethodsAdult male guinea pigs were administered ovalbumin 100mg/kg subcutaneous (SC) and 100mg/kg intraperitoneal (IP). Treatment with rosiglitazone [5mg/kg/day, per oral (PO)] was assessed for 21 days. On day 21, the animals were challenged with the same dose of ovalbumin. The forced expiratory volume in 1s (FEV1) to forced vital capacity (FVC), FEV1/FVC, was measured using a spirometer to diagnosis lung obstruction. Serum levels of interleukin-5 (IL-5) and immunoglobulin E (IgE) were assessed. The activity of superoxide dismutase (SOD) and catalase and the level of reduced glutathione (GSH) were determined in lung tissue homogenates.
Key findingsOur results demonstrated that treatment with rosiglitazone resulted in a statistically significant improvement in lung function and histopathological features. Significant decrease in the serum levels of IL-5 and IgE were observed. The activity of SOD and catalase as well as the GSH level were significantly increased in the lung tissues of treated animals compared with untreated asthmatic animals. Serum IgE concentrations and IL-5 levels were directly correlated to each other and inversely correlated to the SOD, GSH and catalase levels in the all studied guinea pigs.
ConclusionsOur results provide evidence that the PPAR- agonist rosiglitazone may have potential in the development of therapies for bronchial asthma.