垂体腺苷酸环化酶激活多肽拮抗剂对实验性急性胰腺炎的影响

目的　探讨垂体腺苷酸环化酶激活多肽 (PACAP)受体拮抗剂 PACAP6 - 2 7和 (4 - Cl- D- Phe6 ,L eu17)VIP对实验性急性胰腺炎 (AP)发生发展的影响。方法　将 Wistar大鼠分为正常对照组、AP组和 PACAP受体拮抗剂干预组等 ;使用蛙皮缩胆囊肽和牛磺胆酸钠诱发 AP,4 h后观察胰腺改变并测定血清淀粉酶、胰腺干湿比和PACAP含量等。结果　静脉输注 PACAP6 - 2 7(10 ,10 0 μg/ kg)可导致胰腺组织水肿和炎性细胞浸润 ,血清淀粉酶显著高于正常对照组〔(14 6 4 .33± 2 6 5 .6 ) IU/ L 和 (16 92 .17± 312 .18) IU/ L vs正常对照组 (5 2 0 .8± 16 3.2 7) IU/L,P<0 .0 5〕;PACAP6 - 2 7和 (4 - Cl- D- Phe6 ,L eu17) VIP促使蛙皮缩胆囊肽诱发 AP胰腺腺泡细胞空泡化加剧 ,胰腺组织有出血、脂肪和实质坏死 ,病变严重程度与牛磺胆酸钠诱发 AP相似 ;PACAP6 - 2 7加剧牛磺胆酸钠诱发 AP胰腺出血、腺泡细胞空泡化和实质坏死。EL ISA检测显示 ,蛙皮缩胆囊肽和牛磺胆酸钠诱发 AP胰腺和十二指肠组织的 PACAP水平较正常对照显著增高。结论　 PACAP6 - 2 7和 (4 - Cl- D- Phe6 ,L eu17)可诱发轻型胰腺炎 ,加重实验性 AP;PACAP可能参与了实验性 AP的发生发展

Effects of Analogs of Pituitary Adenylate Cyclase Activating Polypeptide on Acute Pancreatitis in Rats

OBJECTIVE: To examine the effects of analogs of pituitary adenylate cyclase activating polypeptide (PACAP)--PACAP6-27 (10, 100 microg/kg) and (4-Cl-D-Phe6, Leu17)VIP (10, 100 microg/kg) on the pancreata of normal rats and on the development of experimental acute pancreatitis. METHODS: Male Wistar rats were allocated into normal control groups, experimental acute pancreatitis groups and PACAP analog intervention groups. Acute pancreatitis was induced with s.c. cerulein and intraductal sodium taurocholate; PACAP analogs were infused intravenously immediately after pancreatitis induction. Pancreatic morphology was observed at 4 h, and serum amylase, pancreatic water content and PACAP contents were measured. RESULTS: It was found that PACAP6-27 induced pancreatic edema, inflammatory cell infiltration, and elevation of serum amylase [(1464.33 +/- 265.6)-(1692.17 +/- 312.18)] IU/L vs (520.8 +/- 163.27) IU/L of control, P < 0.05); that PACAP6-27 aggravated vacuolization of pancreatic acinar cells in cerulein-induced pancreatitis with hemorrhage and fatty and parenchymal necrosis; and that the pathological changes of cerulein plus 100 microg/kg PACAP group were similar to those of sodium taurocholate-induced pancreatitis. Pancreatic hemorrhage, vacuolization of acinar cells and parenchymal necrosis in sodium taurocholate-induced pancreatitis were worsened by PACAP6-27. (4-Cl-D-Phe6, Leu17)VIP had similar effects. ELISA showed that pancreatic and duodenal levels of PACAP were increased in cerulein- and sodium taurocholate-induced pancreatitis. CONCLUSION: PACAP6-27 and (4-Cl-D-Phe6, Leu17)VIP could induce mild pancreatitis and aggravate experimental acute pancreatitis. PACAP probably plays a role in the pathogenesis of acute pancreatitis.