Curcumin ameliorated ventilator-induced lung injury in rats.

BACKGROUND

Curcumin (CUR) is a Chinese medicine monomer with antioxidant and anti-inflammatory properties. The aim of this study was to investigate the effects and mechanisms of CUR treatment on ventilator-induced lung injury (VILI) in rats.

METHODS

Total 50 SD rats were divided into five groups: sham, VILI, VILI+CUR-50 (CUR 50?mg/kg pretreated intraperitoneal), VILI+CUR-200 (CUR 200?mg/kg pretreated intraperitoneal) and VILI?+?DXM (5?mg/kg pretreated intraperitoneal). The morphology and ultrastructure were observed by microscope and transmission electron microscope. The wet to dry ratio, protein concentration in bronchoalveolar lavage fluid (BALF), evans blue dye (EBD) content, nuclear factor kappa B (NF-?B) activity, myeloperoxidase (MPO), malondialdehyde (MDA), xanthine oxidase (XO) and total antioxidative capacity (TAOC) levels were measured.

RESULTS

Histological studies revealed that inflammatory cells infiltration and alveolar edema were significantly severe in VILI as compared to other groups. CUR-200 and DXM treatment reversed lung injury significantly. The wet to dry ratio, protein concentration in BALF, EBD content, MPO activity, tumor necrosis factor (TNF)-? level and NF-?B activity were significantly increased in VILI group as compared to other groups. CUR-200 and DXM treatment significantly suppressed permeability and inflammation induced by ventilation. Furthermore, the significantly higher MDA content in VILI could be markedly decreased by CUR-200 and DXM treatment while the levels of XO and TAOC were markedly recovered only by CUR (200?mg/kg) treatment after VILI.

CONCLUSION

CUR could inhibit the inflammatory response and oxidative stress during VILI, which is partly through NF-?B pathway.