N-乙酰半胱氨酸对急性胰腺炎模型大鼠的保护作用

摘要

背景：急性胰腺炎是由胰腺腺泡细胞损伤介导的常见炎性疾病，白细胞浸润是其主要的发病特征。近来发现N-乙酰半胱氨酸能够控制白细胞游走并在一些严重的炎症疾病中发挥调节炎症反应的作用。n　　目的：观察N-乙酰半胱氨酸在体内对牛黄胆酸盐诱导的急性胰腺炎大鼠模型的保护作用。n　　方法：90只SD大鼠随机等分为正常对照组、急性胰腺炎组和N-乙酰半胱氨酸组，后2组以十二指肠大乳头逆行注射牛黄胆酸盐制备急性大鼠胰腺炎模型。N-乙酰半胱氨酸组大鼠由尾静脉给予N-乙酰半胱氨酸治疗。结果与结论：急性胰腺炎模型诱导后大鼠血浆淀粉酶活性较正常对照组大鼠显著升高(P<0.05)。急性胰腺炎组白细胞介素1β，6，10和肿瘤坏死因子α表达水平明显高于正常对照组(P<0.05)。免疫荧光化学显示N-乙酰半胱氨酸主要表达在胰岛细胞上，急性胰腺炎组织 N-乙酰半胱氨酸的表达从 mRNA 水平到蛋白水平都明显低于正常组织。N-乙酰半胱氨酸治疗显著降低了大鼠血清淀粉酶水平，髓过氧化物酶活性以及促炎性细胞因子产物生产和胰腺及肺组织损伤，但N-乙酰半胱氨酸治疗并没有明显抑制胰腺组织核因子κB的激活。提示N-乙酰半胱氨酸能改善急性胰腺炎大鼠胰腺和肺脏的组织损伤，并发挥抗炎症的作用。%BACKGROUND:Acute pancreatitis is a common inflammatory disease mediated by pancreatic acinar cel s injury, and is mainly characterized by leukocyte infiltration. N-acetylcysteine can control leukocyte migration and regulate inflammation in some serious inflammatory diseases. OBJECTIVE:To investigate the protective effects of N-acetylcysteine in rat model of acute pancreatitis caused by sodium taurocholate. METHODS:Ninety Sprague-Dawley rats were randomly divided into three groups:normal control group, acute pancreatitis group and N-acetylcysteine group. Except normal control group, acute pancreatitis model was established in the other two groups by retrograde injection of sodium taurocholate into major duodenal papil a. Rats in the N-acetylcysteine group were treated with N-acetylcysteine intravenously through the tail vein. RESULTS AND CONCLUSION:After acute pancreatitis model was established, plasma amylase levels in the models were significantly higher than that in the normal control rats (P<0.05). Interleukin-1β,-6,-10, and tumor necrosis factorαexpression levels were also obviously higher than that in the normal control rats (P<0.05). Immunohistochemical staining demonstrated that N-acetylcysteine was mainly expressed in the islet cel s, and the pancreatic expression of N-acetylcysteine was down-regulated at both the mRNA and protein levels during the course of acute pancreatitis. N-acetylcysteine administration significantly reduced plasma amylase levels, myeloperoxidase activity, pro-inflammatory cytokine production, and pancreas and lung tissue damages. Furthermore, N-acetylcysteine administration did not cause significant inhibition of nuclear factor-κB activation in the pancreas. N-acetylcysteine is capable of improving damage of pancreas and lung, and exerting anti-inflammatory effects in rats with severe acute pancreatitis.