Effects of Aliskiren, an RAAS inhibitor, on a carrageenan-induced pleurisy model of rats.

Our aim is to investigate the potentially preventive effects of Aliskiren in a carrageenan-induced lung pleurisy model and to compare the standard anti-inflammatory agents, indomethacin and dexamethasone. The pleurisy model was induced through the injection of carrageenan (0.2 ml-%2) into the pleural cavity. After the experiment, serum and lung tissues were collected and biochemical, molecular and pathological examinations were performed. In our study, pleural inflammation decreased superoxide dismutase activity and the glutathione level and increased the malondialdehyde level in the lung of rats, while Aliskiren increased the superoxide dismutase activity and glutathione level and decreased the malondialdehyde level. In addition, carrageenan-induced pleurisy caused a significant increase in pro-inflammatory cytokines mRNA expressions (TNF-α, IL-1β, and NF-KB), while Aliskiren administration decreased their expressions as well as the standard treatments, indomethacin and dexamethasone, did. Aliskiren administration at the 200 mg/kg dose protected the lungs in the pathological evaluation, especially against inflammatory cell infiltration and edematous lesions. It appears that Aliskiren protects the lung from carrageenan-induced pleurisy damage by regulating inflammation and antioxidant-oxidant balance via Renin Angiotensin Aldosterone System inhibition.