小鼠对雨蛙肽诱发急性胰腺炎易感性的品系差异

目的: 小鼠是常用于胰腺炎研究的模式动物。然而不同品系的小鼠似乎对胰腺炎有着不同的易感性,但缺乏系统的对比研究。我们因此比较了C57BL/6J、BALB/c和ICR 小鼠对雨蛙肽诱导的急性胰腺炎易感性的差异。方法: 2月龄C57BL/6J、BALB/c和ICR雌鼠各12只,随机分为实验组(n=6)和对照组(n=6)。实验组予以腹腔注射雨蛙肽(50 μg/kg),每小时1次,共注射7次;对照组同法注射等量生理盐水。分别于第1次注射后的0、3、6、9、12、24 h取小鼠血浆,并于24 h处死小鼠取其胰腺组织。测定各组小鼠的血浆淀粉酶和脂肪酶活性;观察其胰腺组织的病理形态学改变程度及炎症因子表达水平。结果: 雨蛙肽诱导胰腺炎后,BALB/c和ICR小鼠的血浆淀粉酶和脂肪酶水平较C57BL/6J小鼠升高更为显著;C57BL/6J小鼠与其它2种品系的小鼠相比,其胰腺病理形态学改变程度较轻,胰腺组织炎症因子表达水平也较低。结论: BALB/c和ICR小鼠对雨蛙肽诱导的急性胰腺炎的敏感性比C57BL/6J小鼠高。这一结果对急性胰腺炎研究中小鼠品系的合理选择具有指导意义。

Strain difference of susceptibility to caerulein-induced acute pancreatitis in mice

AIM: To study the difference of susceptibility to caerulein-induced acute pancreatitis (AP) among the mice of C57BL/6J, BALB/c and ICR strains.METHODS: Two-month-old female mice of C57BL/6J, BALB/c and ICR strains (12 mice for each strain) were divided into control group (n=6) and experimental group (n=6), respectively. The mice were intraperitoneally injected with caerulein (50 μg/ kg) in 1 h interval for 7 serial injections in total. The mice in control group were treated with saline according to the same procedure in experimental group. The blood samples were collected at 0 h, 3 h, 6 h, 9 h, 12 h and 24 h after the first injection of caerulein or saline for plasma α-amylase and lipase assays. The mice were sacrificed 24 h after AP induction, and the pancreatic tissues were harvested for further investigating the pathological changes and expression of inflammatory factors.RESULTS: After AP induction, the mice of BALB/c and ICR strains demonstrated more dramatic increase in plasma α-amylase activity and lipase activity than those of C57BL/6J mice. C57BL/6J mice showed milder morphological changes and lower expression of inflammatory factors in pancreata than those of BALB/c and ICR mice.CONCLUSION: The mice of C57BL/6J strain have less susceptibility to caerulein-induced AP than that of BALB/c and ICR mice.