急慢性大鼠梗阻性黄疸模型的建立

Establishment and evaluation of a rat model of reversible obstructive jaundice

AIM: To establish a rat model of reversible obstructive jaundice and to evaluate its clinical practical value.

METHODS: Thirty-two Wistar rats were randomly divided into a reversible obstructive jaundice group (ROJ) and an obstructive jaundice group (OJ). In the ROJ group, bile duct obstruction was induced by ligation of the bile duct and a PICC catheter in parallel. After 5 d, the PICC catheter was pulled out to allow the recanalization of the bile duct. In the OJ group, complete obstructive jaundice was induced. Eight rats from each group were sacrificed on days 5 and 8, respectively, which were designated as ROJ5, ROJ8, OJ5 and OJ8, respectively. Serum total bilirubin (TBIL), alanine aminotransferase (ALT) and alkaline phosphatase (ALP) levels were measured before operation and on days 5, 6 and 8 after operation. Intestinal mucosal tissue samples were taken and stained with hematoxylin and eosin to observe the changes in intestinal mucosal morphology and damage.

RESULTS: The changes in serum TBIL, ALT and ALP in the ROJ5 group were similar to those in the OJ5 group on day 5 after the model establishment, and there was no difference in liver function parameters between the two groups at each time point. Three days after the catheter was removed in the ROJ group, serum levels of TBIL, ALT and ALP quickly recovered, and the damage of the intestinal mucosa was significantly reduced. The intestinal mucosal injury index in the ROJ8 group was significantly lower than that in the OJ8 group.

CONCLUSION: The rat model of reversible obstructive jaundice developed by "ligation of the bile duct and removal of support catheter" is a stable and reliable animal model.

Treatment with rosuvastatin calcium improves liver fibrosis in a rat model of chronic obstructive jaundice

AIM: To investigate the effect of treatment with rosuvastatin calcium on expression of Ox-LDL and liver fibrosis in a rat model of chronic obstructive jaundice.

METHODS: Ninety Sprague-Dawley rats were randomly and equally divided into three groups: control group, and chronic obstructive jaundice group, and rosuvastatin calcium group. Each group was further divided into five subgroups for testing at different time points. Liver function was determined. Expression of Ox-LDL was tested by immunofluorescence, and liver fibrosis was assessed by radioimmunoassay. Pathological changes in liver tissue were observed by optical microscopy at weeks 1, 2, 3, 4, and 5 after model induction. Choledochoduodenostomy was performed at week 4.

RESULTS: Rats with chronic obstructive jaundice showed remarkable jaundice and obvious degeneration and hyperplasia of liver cells. There were also significant changes in expression of Ox-LDL and three liver fibrosis indicators. Jaundice slowly subsided after choledochoduodenostomy. Total bilirubin, expression of Ox-LDL and three liver fibrosis indicators differed significantly at different time points between the chronic obstructive jaundice group and rosuvastatin calcium group (all P < 0.05).

CONCLUSION: There was a significant relation between expression of Ox-LDL and liver fibrosis in rats with chronic obstructive jaundice. Treatment with rosuvastatin calcium could regulate the expression of Ox-LDL and improve liver fibrosis in rats with chronic obstructive jaundice.

Effect of different biliary drainage methods on intestinal barrier function in rats with obstructive jaundice

AIM: To investigate the effect of different biliary drainage methods on intestinal barrier function in rats with obstructive jaundice.

METHODS: Sixty healthy SD rats were divided into four groups: sham-operation (SO) group, obstructive jaundice (OJ) group, internal drainage (ID) group, and external drainage (ED) group. One week after surgery, specimens from the rats of the SO and OJ groups were collected. Biliary drainage was performed using different methods in the ID and ED groups, and the specimens were harvested seven days after drainage. The levels of alanine aminotransferase (ALT), total bilirubin (TBIL), direct bilirubin (DBIL), and total bile acide (TBA) in serum, and sIgA in intestine mucus were determined and compared between different groups.

RESULTS: Serum levels of ALT, TBIL, DBIL, and TBA were significantly higher in the OJ group than in the SO, ID, and ED groups. The levels of sIgA in intestine mucus were significantly higher in the ID group than in the OJ and ED groups (0.272 ± 0.182 vs 0.160 ± 0.150, 0.191 ± 0.113, both P < 0.05).

CONCLUSION: Both ID and ED effectively relieve biliary obstruction and improve liver function. ID significantly increases intestinal mucus sIgA. The effect of ID on intestinal barrier function is better than that of ED.