Abstract
Cyclophosphamide causes lung injury in rats through its ability to generate free radicals with subsequent endothelial and epithelial cell damage. In order to observe the protective effects of a potent anti-inflammatory antioxidant, curcumin (diferuloyl methane) on cyclophosphamide-induced early lung injury, healthy pathogen free male Wistar rats were exposed to 20 mg/100 g body weight of cyclophosphamide, intraperitoneally as a single injection. Prior to cyclophosphamide intoxication oral administration of curcumin was performed daily for 7 days. At various time intervals (2, 3, 5 and 7 days post insult) serum and lung samples were analyzed for angiotensin converting enzyme, lipid peroxidation, reduced glutathione and ascorbic acid. Bronchoalveolar lavage fluid was analyzed for biochemical constituents. The lavage cells were examined for lipid peroxidation and glutathione content. Excised lungs were analyzed for antioxidant enzyme levels. Biochemical analyses revealed time course increases in lavage fluid total protein, albumin, angiotensin converting enzyme (ACE), lactate dehydrogenase, N-acetyl-β-D-glucosaminidase, alkaline phosphatase, acid phosphatase, lipid peroxide levels and decreased levels of glutathione (GSH) and ascorbic acid 2, 3, 5 and 7 days after cyclophosphamide intoxication. Increased levels of lipid peroxidation and decreased levels of glutathione and ascorbic acid were seen in serum, lung tissue and lavage cells of cyclophosphamide groups. Serum angiotensin converting enzyme activity increased which coincided with the decrease in lung tissue levels. Activities of antioxidant enzymes were reduced with time in the lungs of cyclophosphamide groups. However, a significant reduction in lavage fluid biochemical constituents, lipid peroxidation products in serum, lung and lavage cells with concomitant increase in antioxidant defense mechanisms occurred in curcumin fed cyclophosphamide rats. Therefore, our results suggest that curcumin is effective in moderating the cyclophosphamide induced early lung injury and the oxidant-antioxidant imbalance was partly abolished by restoring the glutathione (GSH) with decreased levels of lipid peroxidation.
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Venkatesan, N., Chandrakasan, G. Modulation of cyclophosphamide-induced early lung injury by curcumin, an anti-inflammatory antioxidant. Mol Cell Biochem 142, 79–87 (1995). https://doi.org/10.1007/BF00928916
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DOI: https://doi.org/10.1007/BF00928916