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There is increasing evidence indicating that the distant organ injury is a major contributor of high mortality in patients subjected to acute renal failure (ARF). However, sources and mechanisms that ARF causes distant organ injury remain to be determined. The aim of this study is to explore the mechanism from polymorphonuclear neutrophil (PMN) sequestration and membrane pump suppression. To achieve this, we examined myeloperoxidase (MPO), a marker of PMN accumulation in tissues, and membrane pump activities of heart, pancreas, and kidney in two ARF rabbit models. Rabbits are randomly assigned to control, HgCl2-treated, and glycerin-treated groups. ARF animal models are established by hypodermic injection of 1% HgCl2 with 1.3 mL/kg bodyweight (bw) in HgCl2-treated group or intramuscular injection of 50% glycerin with 10 mL/kg bw in glycerin-treated group, respectively, and all animals in each group are further divided into 12 h, 24 h, and 48 h subgroups with each consisting of six rabbits. Six healthy rabbits serve as control group. Results have shown that MPO activities of kidney, myocardium, and pancreas in two model groups were significantly increased than control group at diverse time points. Membrane pump activities of kidney in two model groups are significantly lower than the control group at multiple time points. Moreover, Na+-K+-, Ca2+-, Mg2+-, and Ca2+-Mg2+-ATPase activities of myocardium and pancreas in two model groups are gradually declined with the development of ARF. These findings suggest that PMN sequestration and membrane pump suppression plays an important role in the pathogenesis of ARF and also a major mechanism of myocardium and pancreas injury during the process of ARF. [ABSTRACT FROM AUTHOR]

Background. Acute renal failure (ARF) is a common critical disorder. To decrease the mortality, it is important to prevent ARF from invading other organs in clinical setting. It is not known whether there is a dysfunction in pancreas during the pathogenesis of ARF. This study aimed to investigate the changes of morphology and function on pancreas in ARF rabbits. Methods. Sixty rabbits were randomly divided into four groups. The ARF model of groups 1 and 2 rabbits was established by hypodermic injection of 1% HgCl2 (1.3 mL/kg) and intramuscular injection of 50% glyceritum (10 mL/kg), respectively. The control groups 1 and 2 were injected with same volume of normal saline. After 24 hours, urea and creatinine contents and pancreatic amylase (AMY) activities in serum were measured using an automatic biochemical analyzer; the insulin levels were measured with radioimmunoassay method. Moreover, morphological alterations were examined by light microscopy; free radicals, nitric oxide (NO), and nitric oxide synthase (NOS) in pancreas homogenate were determined. Results. Morphological study showed that there were vacuolar degeneration and necrosis in pancreas of ARF for both groups 1 and 2. Compared with corresponding control group, the AMY activity was significantly elevated, whereas the INS values were decreased significantly in ARF groups 1 and 2. Malonaldehyde, NO, and NOS in pancreas homogenate were significantly increased, and superoxide dismutase activity was decreased. Conclusion. These data suggested that there were morphological damage of pancreas and disturbance of pancreatic secretion function in rabbits with ARF. Free radicals-injury and NO excessive release may explain the observed dysfunction. [ABSTRACT FROM AUTHOR]