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Protective effect of pyrrolidine dithiocarbamate on liver injury induced by intestinal ischemia-reperfusion in rats |
Xiao-Feng Tian, Ji-Hong Yao, Ying-Hua Li, Hai-Feng Gao, Zhen-Zhen Wang, Chun-Ming Yang and Shu-Sen Zheng |
Dalian, China
Author Affiliations: Department of General Surgery, Second Affiliated Hospital of Dalian Medical University, Dalian 116027, China (Tian XF, Li YH, Gao HF and Yang CM); Department of Pharmacology, Dalian Medical University, Dalian 116027, China (Yao JH and Wang ZZ); and Department of Hepatobiliary and Pancreatic Surgery, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China (Zheng SS)
Corresponding Author: Xiao-Feng Tian, MD, Department of General Surgery, Second Affiliated Hospital of Dalian Medical University, Dalian 116027, China (Tel: 86-411-84671619; Fax: 86-411-84672130; Email: txfdl@tom.com) |
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Abstract BACKGROUND: The nuclear translocation of transcription factors may be a critical factor in the intracellular pathway involved in ischemia/reperfusion (I/R) injury. The aim of the study was to evaluate the role of nuclear factor-kappa B (NF-κB) in the pathogenesis of liver injury induced by intestinal ischemia/reperfusion (IIR) and to investigate the effect of pyrrolidine dithiocarbamate (PDTC) on this liver injury.
METHODS: Male Wistar rats were divided randomly into three experimental groups (8 rats in each): sham operation group (control group); intestinal/reperfusion group (I/R group): animals received 1-hour of intestinal ischemia and 2-hour reperfusion; and PDTC treatment group (PDTC group): animals that received I/R subject to PDTC treatment (100 mg/kg). The histological changes in the liver and intestine were observed, and the serum levels of tumor necrosis factor-α (TNF-α), alanine aminotransferase (ALT), aspartate aminotransferase (AST), liver superoxide dismutase (SOD), and nitrite/nitrate (NO) were measured. The immunohistochemical expression and Western blot analysis of liver NF-κB and intercellular adhesion molecule-1 (ICAM-1) were observed.
RESULTS: IIR induced liver injury characterized by the histological changes of liver edema, hemorrhage, polymorphonuclear neutrophil (PMN) infiltration, and elevated serum levels of AST and ALT. The serum TNF-α level was significantly higher than that of the control group (P<0.01) and a high level of liver oxidant product was observed (P<0.01). These changes were parallel to the positive expression of NF-κB and ICAM-1. After the administration of PDTC, the histological changes after liver injury were improved; the levels of SOD and NO in the liver were elevated and reduced, respectively (P<0.01). The expressions of ICAM-1 and NF-κB in the liver were weakened (P<0.01).
CONCLUSION: NF-κB plays an important role in the pathogenesis of liver injury induced by IIR. PDTC, an agent known to inhibit the activation of NF-κB, can reduce and prevent this injury.
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