晚期糖基化终末产物受体在急性坏死性胰腺炎大鼠中的表达

目的 观察急性坏死性胰腺炎(ANP)大鼠发病过程中胰腺组织及血清中晚期糖基化终末产物受体(the receptor for advanced glycation end products,RAGE)含量变化的规律.方法 64只雄性SD大鼠按完全随机法分为对照组,ANP 6、18、24、36、48、72、96 h组,每组8只.采用腹腔注射20％L-精氨酸250 mg/100 g体重2次、间隔1h方法制备ANP模型.对照组大鼠腹腔注射等容积生理盐水.胰腺组织行病理学检查并评分.检测腹水量、血清淀粉酶及RAGE浓度,实时PCR法检测胰腺组织RAGE mRNA表达.结果 ANP组胰腺病理损伤随时间延长逐渐加重；腹水量从6h的(1.98±0.64)ml增加到96h的(8.69 ±0.62) ml；血清淀粉酶浓度从造模后6h开始升高,18h达(5069.88±603.25)U/L,36 h时恢复正常.对照组大鼠血清RAGE浓度及胰腺组织RAGE mRNA表达量分别为(18.33±2.99) ng/ml和0.41 ±0.13.ANP组6h时两者开始升高,分别为(30.31±5.03)ng/ml和1.57±0.19,较对照组显著升高(P＜0.05)；24 h组达峰值,分别为(105.41±21.31)ng/ml和4.23±0.73,较ANP其他时间点显著升高(P值均＜0.05)；96 h下降至最低点,分别为(33.54±6.96) ng/ml和1.19±0.19,但仍高于对照组(P＜0.05).结论 血清RAGE浓度及胰腺组织RAGE mRNA表达量在ANP发生36 h内逐渐增加,随后下降,但始终高于正常值.

Expression of receptor for advanced glycation end products in rats with acute necrotizing pancreatitis

Objectives To explore the expression of the receptor for advanced glycation end products (RAGE) in pancreas and the serum concentration of RAGE in rats with acute necrotizing pancreatitis (ANP).Methods Sixty four male Spraque-Dawley rats were randomly divided into control group,ANP 6,18,24,36,48,72,96 h group with 8 rats in each group.The rat model of ANP was established by injecting 20％ L-arginine intraperitoneally at the dose of 250mg/100g body weight for twice at the interval of 1 h.Rats in control group were injected intraperitoneally with the same amount of saline.The pancreas samples were histologically examined by light microscope and scored.The amount of ascites,levels of serum amylase and RAGE was determined; Real-time PCR was performed to detect the expression of RAGE mRNA in pancreatic tissue.Results Pancreatic injuries aggravated with time.The amount of ascites increased from ( 1.98 ± 0.64) ml at 6h to (8.69 ±0.62)ml at 96 h.Serum amylase level began to increase at 6h after L-arginine intraperitoneal injection and reached the peak value at 18 h(5069.88 ± 603.25 ) U/L],and returned to normal at 36 h.The serum concentration of RAGE and RAGE mRNA expression in pancreatic tissue were ( 18.33 ± 2.99) ng/ml and 0.41 ±0.13 in the control group.The corresponding values increased at 6 h in ANP group,which were (30.31 ±5.03) ng/ml and 1.57 ±0.19,and they were significantly higher than those in the control group (P ＜0.05) ; they reached the peak value at 24 h( 105.41 ±21.31 ) ng/ml and 4.23 ±0.73],which were significantly higher than those in other ANP groups ( P ＜ 0.05 ) ; at 96 h they decreased to the lowest point ( 33.54 ± 6.96) ng/ml and 1.19 ± 0.19],which were still significantly higher than those in the control group (P ＜ 0.05 ).Conclusions The expression levels of RAGE in pancreatic tissues and serum level of RAGE increase within 36 h of ANP onset,then decrease gradually,but they are always higher than normal values.