目的 探讨高脂血症对胰腺腺泡细胞三磷酸肌醇(IP3)介导的信号通路的影响.方法 将24只大鼠随机分为两组各12只,观察组建立高脂血症模型,予高脂饲料饮食,对照组予普通饲料饮食,4周后检测两组胰腺腺泡细胞内IP3水平及缩胆囊素(CCK)刺激的腺泡细胞淀粉酶释放率.结果 观察组胰腺腺泡细胞IP3水平、淀粉酶释放率均明显高于对照组,P均＜0.01.结论 高脂血症大鼠胰腺腺泡细胞CCK/IP3信号通路发生变化,其信号分子IP3表达增高,腺泡细胞对CCK刺激的外分泌敏感性增加.

Objective To investigate the effects of high-fat diet on pancreatic acinar cells' IP3 expression and CCK-induced amylase release in rats.Methods Male Wistar rats were divided into high-fat diet group and normal diet group,they were fed for 4 weeks.Blood triglycerides,cholesterol,amylase and glucose levels were determined by automatic biochemical analyzer.Pancreatic tissues were taken for histopathological observations.Pancreatic acinar cells were isolated and cultured,and intracellular inositol 1,4,5-trisphosphate (IP3) was detected using a commercial kit.Amylase release rates were measured after CCK-8 stimulation.Results The rats in high-fat diet group appeared hyperlipidemia,vacuolization of acinar cells and the lymphocytes appeared around the acinar cells can be seen on the pancreatic tissue pathology staining.The levels of IP3 in acinar cells of rats fed a high-fat diet were higher than that of normal rats [(31.807 ± 3.448) pmol/106 cells vs (24.632 ± 3.649) pmol/106 cells,t=7.479,P＜0.001];and amylase release rate in these rats'acinar cells were also higher than those of normal rats [when CCK-8=0.01 nmol/L:( 11.056 ±3.369)％ vs (7.354 ± 2.181) ％,t=3.912,P＜0.001;when CCK-8=1 nmol/L:( 13.854 ± 4.087 ) ％ vs (9.432 ±2.477) ％,t=3.939,P＜0.001 ) after CCK-8 stimulation in different concentrations.Additionally,there was a positive co-relationship between acinar cell's IP3 level and amylase release (r=0.896,P＜0.001 ).Conclusion Chronic high-fat diet induces hypersensitivity for pancreatic acinar cells' exocrine function,and IP3 as a signal molecule may play an important role in this process.

血清甘油三酯(triglyceride,TG)值≥11.3 mmol/L即可诱发胰腺炎,约1.4%~3.5%的胰腺炎是由高甘油三酯血症引起,此类胰腺炎称为高脂血症性胰腺炎(hyperlipidemic pancreatitis,HLP),本文就HLP发病机制及临床诊治进展进行综述。