L-精氨酸诱导实验性慢性胰腺炎大鼠模型的可行性分析

目的 初步探讨L-精氨酸诱导慢性胰腺炎大鼠动物模型的可行性.方法 将实验动物按完全随机法分为对照组及精氨酸12、24 h和7 d组,每组10只,间隔1 h分两次腹腔内注射L-精氨酸溶液造模.造模后相应时间点检测血淀粉酶、血糖水平,对胰腺组织进行病理评分,Van Gieson法对胰腺胶原纤维染色.结果 对照组及精氨酸12、24 h和7 d组的血淀粉酶水平分别为(1 634±890)U/L、(3 872±2 676)U/L、(3 307±2 197)U/L和(1 561±304)U/L,精氨酸7 d组血淀粉酶水平显著低于12 h和24 h组(P＜0.05),恢复到对照组水平.各组间血糖水平无明显差异.对照组及精氨酸12、24 h和7 d组胰腺的病理分值分别为0.8±0.4、5.1±2.6、6.5±2.2和4.5±1.6,精氨酸7 d组胰腺病理评分显著低于24 h组(P＜0.05),但仍显著高于对照组(P＜0.05).精氨酸7 d组胶原染色范围明显增加,其他各组未见明显胶原染色.结论 L-精氨酸腹腔注射后7 d可引起胰腺组织纤维化及管状复合结构增生,可用于探索慢性胰腺炎大鼠模型.

Feasibility study of induction of experimental chronic pancreatitis with L-arginine

Objective To investigate the feasibility of induction of experimental chronic pancreatitis rat model with L-arginine.Methods Animals were randomly divided into control group,arginine 12 h group,arginine 24 h group and arginine 7 d group with 10 rats in each group.L-arginine solution was intraperitoneally injected twice with an interval of 1 h.Serum amylase and glucose levels at corresponding time points were detected and histopathological scores of pancreas were evaluated.Collagen in pancreas was stained with Van Gieson method.Results Serum amylase levels were (1 634±890 ) U/L,( 3 872±2 676 ) U/L,( 3 307±2 197)U/L and (1 561±304) U/L in control group,arginine 12 h group,arglnine 24 h group and arginine 7 d group,respectively.The serum amylase level in arginine 7 d group was significantly lower than those in arginine 12 h group and arginine 24 h group (P ＜ 0.05 ).There was no significant difference in serum glucose level among all the groups.Histopathological scores were 0.8±0.4,5.1±2.6,6.5±2.2 and 4.5±1.6,respectively.The histopathological score of arginine 7 d group was significantly lower than those in arginine 24 h group (P ＜ 0.05 ).Obvious collagen could be found in pancreatic parenchyma in arginine 7 d group,while little collagen was found in pancreatic tissue in control,arginine 12 h and arginine 24 h groups.Conclusions Injection of L-arglnine induced fibrosis in pancreatic parenchyma and proliferation of tubular complex 7 days later,and it could be used for chronic pancreatitis model induction.