Aim: The aim of this study is to evaluate the role of Rho-kinase in the pathogenesis of lung injury induced by intestinal ischemia/reperfusion (I/R) and the preconditioning effects of fasudil hydrochloride. The novel therapeutic approach of using Rho-kinase inhibitors in the treatment of intestinal I/R is introduced.
Methods: Sprague-Dawley (SD) rats were divided into 4 groups: intestinal I/R group, two fasudil pretreatment groups (7.5 mg/kg and 15 mg/kg), and controls. Intestinal and lung histopathology was evaluated; myeloperoxidase (MPO) and superoxide dismutase (SOD) levels in lung parenchyma were determined. Serum tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) were measured. eNOS and P-ERM expression were measured by Western Blot.
Results: Lung and intestinal injury were induced by intestinal I/R, characterized by histological damage and a significant increase in BALF protein. Compared to controls, serum TNF-α, IL-6, and lung MPO activity increased significantly in the I/R group, while SOD activity decreased. A strongly positive P-ERM expression was observed, while eNOS expression was weak. After fasudil administration, injury was ameliorated. Serum TNF-α, IL-6, lung MPO and P-ERM expression decreased significantly as compared to the I/R group, while SOD activity and eNOS expression increased significantly.
Significance: Rho-kinase plays a key role in the pathogenesis of lung injury induced by intestinal I/R. The inhibition of the Rho-kinase pathway by fasudil hydrochloride may prevent lung injury.
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