Abstract

Aim: The thoracoabdominal aortic aneurysm surgery may cause splanchnic ischemia and may result in severe postoperative complications caused by liver and/or kidney injury. This study investigated the effect of temporary occlusion of the aorta on the development of I/R injury of liver and kidney and the protective effect of montelukast, a selective reverse CysLT1 receptor antagosit. Material and Methods: Twenty-one male Sprague-Dawley rats were randomly assigned to three groups (n=7 per group) as G1 (no aortic occlusion and montelukast administration), G2 (45 min. aortic occlusion; no montelukast administration) and G3 (45 min. aortic occlusion, 10 mg/kg montelukast administration). At the 48th hour of reperfusion, kidney and liver samples were dissected for histopathological evaluation and immunohistochemical staining for HSP70, interleukin-6 and myeloperoxidase (MPO). Results: Tissue samples taken from the kidney showed significant intergroup differences in terms of tubular cell degeneration, cytoplasmic vacuole formation, hemorrhage and tubular dilatation (P = 0.001, P = 0.017, P = 0.001, P = 0.001 respectively). There was a significant difference with regards to HSP-70 stain (P = 0.01) in favor of G1 and G3 with respect to G2. Hepatocyte degeneration in the liver samples of G3 was significantly lower than that of G1 and G2 (P = 0.027). Conclusion: The findings of the current study demonstrated that montelukast has protective effects on both kidney and liver; and were confirmed histopathologically and immunohistochemically. The protective effects of montelukast can be attributed to its potential of anti-oxidative and anti-inflammatory actions.

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