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胆道梗阻及再通术后ICAM-1表达变化的实验研究
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摘要
目的:初步探讨SD大鼠胆道梗阻及再通术后细胞间粘附分子一1(ICAM—1)在外周血白细胞及肝脏和小肠组织中的表达变化及大鼠ICAM-1的异常表达与梗阻性黄疸器官功能损伤间的关系。
     方法:随机将120只SD大鼠分成三组,手术对照组(SH)、梗阻性黄疸组(OJ)、胆肠内引流组(ID),第一次次手术SH组仅分离胆总管,OJ组、ID组行胆总管结扎,常规饲养7天之后二次开腹,SH组处理同前,OJ组仅分离胆总管,ID组行胆肠内引流术,于第一次手术后7天及第二次手术后1d、3d、7d不同时间点分别取标本,检测血清总胆红素(total bilirubin,TB)、谷丙转氨酶(alaninetransminase,ALT)、谷草转氨酶(Aspartate aminotransferase,AST)、白蛋白(Albumin.ALB)的含量。用流式细胞技术(flow cytometry,FCM)检测细胞间粘附分子—1(ICAM—1)在血、肝脏、肠道组织中的表达。用HE常规病理切片观察肝脏、肠道等组织病理学改变及免疫组织化学方法观察细胞间粘附分子一1(ICAM—1)在肝脏、肠道组织中的表达,对所得数据进行统计学处理。
     结果:1、SD大鼠结扎胆总管后TB、ALT、AST等含量呈持续上升的变化,在结扎7天后达上升期高峰。结扎7天后OJ组、ID组与SH组各生化指标比较:均有统计学意义(P<0.05),表明胆道梗阻后7天各生化指标明显升高。ID组行胆肠内引流术后各生化指标明显下降,于术后7天左右恢复正常,OJ组未解除梗阻者持续处于高水平。两组不同时间相比较:P<0.05均有统计学意义,表明胆肠内引流后肝功能指标明显下降。
     2、正常大鼠各组织细胞ICAM-1呈低表达水平,梗阻性黄疸7天后OJ组和ID组静脉血、肝及小肠组织细胞ICAM—1水平明显高于SH组,表明胆道梗阻后各组织ICAM-1呈明显上升趋势。ID组解除梗阻其表达明显下降,OJ组未解除梗阻者持续处于高水平,两组不同时间点比较P<0.05均有统计学意义,表明胆肠内引流后各组织ICAM-1表达明显下降。随着梗阻的时间延长,黄疽加重,各组比较更为显著;提示细胞间粘附分子一1(ICAM—1)与肝、肠组织损伤呈正相关。3、肝、肠组织病理变化:SH组肝脏病理显示正常肝小叶结构。OJ组胆管结扎后汇管区、小叶周边可见到新生小胆管样上皮细胞,少量炎性细胞浸润;原有肝内胆管上皮细胞有少量脱落现象并可见少量肝细胞的坏死灶。ID组内引流后病理变化逐渐恢复正常。OJ组未解除梗阻者胆管上皮细胞增生范围增大,细胞呈扁平形,管腔宽大,其外周基底膜及胶原纤维层增厚。偶有增生的胆管上皮细胞可分化成小胆管,增生的小胆管和纤维母细胞、胶原纤维形成间隔,分割、改建原有的肝小叶,使残存肝细胞形成大小不一的岛状结构。SH组大鼠肠黏膜完整,腺体形态完好,绒毛整齐而规则无萎缩性变化,未见细胞坏死等表现。OJ组肠黏膜在光镜下观察可发现肠粘膜萎缩,绒毛水肿,部分上皮细胞脱落,绒毛平均面积、高度、粘膜平均厚度均减少。随着梗阻时间的延长粘膜厚度变薄,绒毛变低、变窄、炎性细胞增多,小肠绒毛数量减少,变短变粗,互相融合,形态极不规则,并且存在绒毛断裂现象,肠腔内出现大小不等的绒毛碎片,小肠腺变短变细,成萎缩样变。ID组第二次手术后肠组织病理变化逐渐恢复正常。
     结论:SD大鼠在通过结扎胆总管造成梗阻性黄疸时,其TB、ALT、AST变化的规律与人类不同,各生化指标水平在结扎胆总管术后第1-5天呈急剧上升趋势,第7天达到高峰,此后呈缓慢上升趋势,若梗阻未解除则持续处于高水平,若此时行胆肠内引流组各生化指标均明显下降,至术后第7天左右可降至正常。在梗阻性黄疽时ICAM—1参与了肝脏、肠道等组织的损伤,ICAM—1在肝脏、肠道组织中表达程度与血清总胆红素(TB)的水平呈正相关,表明ICAM—1的表达与黄疽的时间和水平程度密切相关;ICAM—1与ALT.AST变化呈正相关性,表明随着ICAM—1持续升高,组织损伤逐渐加重。这均说明血清ICAM
     1的升高与器官功能障碍关系密切,其水平的高低极有可能反映OJ时组织损伤的严重程度。ICAM—1极有可能作为检测梗阻性黄疽(OJ)的重要指标。并提示尽早解除梗阻,可减轻组织损伤。
Objective:To investigate the changes of the expression of intercellular adhesion molecule 1 (ICAM—1) in WBC, liver, distal ileum of obstructive jaundice post-released in SD rats. And to assess relationship between the increased ICAM-1 expression and obstructive jaundice.
     Methods:One hundred and twenty adult Sprague-Dawley rats were randomly assigned to three groups:sham operation(SH, n=40),obstructive jaundice(OJ, n=40) internal biliary drainage (ID, n=40). SH group, only the first separation surgery of common bile duct, OJ group, ID group underwent bile duct ligation. After seven days, A second surgery, SH groups to deal with the former, OJ group only isolated Common bile duct, ID group underwent biliary enteric drainage. On the 7th after the first operation and 1st,3 th,7th days after the second operation, the three groups were succumbed and the specimens of blood and liver, distal ileum were collected. The level of total bilirubin(TB), albumin (ALB), alanine transminase (ALT), aspartate aminotransferase (AST) in serum and liver, distal ileum tissue to value the result of the operation.The expression of ICAM-1 on WBC, liver, distal ileum tissue at different time points was detected by flow cytometry(FCM). HE conventional pathological section with the liver、intestine and other histopathological and immunohistochemical observation of intracellular adhesion molecule 1 (ICAM-1) in the liver, intestinal tissue, on the data for statistical analysis.
     Results:1. The level of TB, ALT, AST,were rising and reaching the peak on the 7th day after the bile duct ligation. Ligation group and the SH group:P<0.05, were statistically significant, suggesting that the biochemical indicators increased significantly on the 7 days after biliary obstruction. The biochemical indices of ID group underwent biliary enteric drainage decreased significantly, and returned to normal on the 7 day after surgery. The biochemical indices of OJ group did not remove the obstruction, continuing high levels.The two groups at different times after the second operation compared:P<0.05 were statistically significant, and indicated that the biochemical decreased significantly after biliary enteric drainage.
     2. The tissue cells of normal rats showed a low expression of ICAM-1 levels.The cell ICAM-1 levels were significantly higher than the SH group on the 7 days after the bile duct ligation. The ICAM-1of ID group underwent biliary enteric drainage decreased significantly. The ICAM-1of OJ group did not remove the obstruction, continuing high levels. The two groups at different times after the second operation compared:P <0.05 were statistically significant and indicated that the ICAM-1 decreased significantly after biliary enteric drainage.With the bile duct ligation prolonged the statistics is more significant; Prompted the ICAM-1 and liver, intestinal tissue injury was positively correlated
     3.The pathological changes of liver、intestinal:SH group showed normal lobular architecture of liver pathology. On 7th day after bile duct ligation, new small biliary epithelia cells appeared in the portal areas and around the liver lobulars with some inflammatory cells infiltrated; As epithelial cells of intra-hepatic bile duct exfoliated some necrosis focuses of hepatic cells were being seen. Pathological changes of ID group gradually returned to normal after biliary enteric drainage. On 7th day after the second operation, in OJ group, the hyper-plastic areas of intra-hepatic bile duct epithelial cells enlarged, the cells were flat and the lumens of the bile ducts were wide, the basal membrane and collagen fibers layers thickened. Occasional ductular epithelial cells can be divided into small bile ducts, proliferation of small bile ducts and fibroblasts, collagen fibers interval, split, converted the original lobule, the remaining liver cells to form large or small island structure. The rats of SH group, intestinal mucosa, gland morphology intact, Hair neat and no atrophic changes in the rules and no tissue necrosis of the performance. OJ group of intestinal mucosa can be found in the intestinal mucosa under light microscope observation of atrophy, villous edema, some epithelial cells shed, the average area of hair, height, the average thickness of the mucosa were reduced. With time mucosal obstruction thinner hair goes low, narrow, inflammatory cells increased, reduce the number of intestinal villi, shorter thicker, convergence, form a very irregular. ID group after the second surgery the pathological changes of intestinal tissue gradually returned to normal.
     Conclusion:By ligating the common bile duct causued the obstructive jaundice of SD rats.TB, ALT, AST, changes are different from humans. The level of TB, ALT, AST, were rising and reaching the peak on the 7th day after the bile duct ligation and then showed a slow upward trend. The biochemical indices of ID group underwent biliary enteric drainage decreased significantly, and returned to normal on the 7 day after surgery. The biochemical indices of OJ group did not remove the obstruction, continuing high levels.In obstructive jaundice, ICAM-1 cause the injury of liver、intestines and other tissue. The ICAM-1 of the liver、intestinal tissues and the levels of TB were positively correlated and suggested that the ICAM-1 have closely related with the time and level of obstructive jaundice; The leves of ICAM-1 and ALT, AST was positively correlated and indicated that with the ICAM-1 continued to rise, the aggravation of tissue injuryed. That all shows the increase of serum ICAM-1 is closely related with organ dysfunction, which can reflect the severity of tissue damage when the bile duct ligation. Detection of ICAM-1 can be used as an important indicator of obstructive jaundice (OJ) and suggested that early removed the Obstruction can reduced tissue damage.
引文
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