大鼠小肠-辅助性肝脏联合移植的实验研究

目的　研究小肠—辅助性肝脏联合移植的可行性以及移植后的肝脏增生。方法　供、受者均为Lewis大鼠 ,分为移植组和对照组。移植组 :切取供者小肠和 6 0 %肝脏 ;切除受者小肠 ;然后将移植物植入受者。移植物血液供应通过连自移植物的腹主动脉和受者腹主动脉端 侧吻合 ,静脉回流通过移植物的肝下下腔静脉和受者左、右肾静脉之间的下腔静脉端 侧吻合。对照组 :单行剖腹探查 ;观察 1 8个月后处死。分别测量两组的肝脏重量 ,检测肝功能、肝脏和小肠的组织学改变。结果　移植组受者自身肝脏未见增生 ,移植肝脏明显增生 ;受者的肝脏 /体重比明显升高。移植组和对照组体重、肝脏功能检查、肝脏和小肠的组织学差异不显著。移植组受者自身肝脏、移植肝脏及对照组肝脏肝细胞的凋亡指数差异无显著性。移植组受者自身肝脏肝细胞增殖指数较移植肝脏及对照组肝脏肝细胞的增殖指数明显降低。结论　小肠—辅助性肝脏联合移植是可行的 ;辅助性肝移植可以提高肝脏 /体重比。

Combined intestine-auxiliary liver transplantation in rats

Objective To observe the long-term effect of combined intestine/auxiliary liver transplantation in rat.Methods Male Lewis rats were used. Total small bowel and 60 % liver were transplanted en bloc with an aortic segment that contained the celiac axis and superior mesenteric artery ensuring the blood supply to the graft. The end-to-side anastomosis was made between donor infrahepatic vena cava (IHVC) and recipient IHVC. The recipient small bowel was resected and the intestine continuity was restored. Sham control (laporotomy only) and transplantation groups were included. Ten rats in each group were followed-up for 18 months and then sacrificed. Liver function tests, terminal deoxynuleotidyl transferase-mediated 2'-deoxyuridine 5'-triphosphate (dUTP) nick end labeling (TUNEL) staining and proliferating cell nuclear antigen (PCNA) staining of liver tissue were evaluated.Results Sixteen rats survived over the operation. There were no significant differences in liver function tests between the sham control group and transplantation group. The grafted liver was hypertrophic and native liver did not regenerate 18 months following transplantation with an increased liver/body weight ratio. TUNEL-staining showed no significant differences among grafted liver, native liver of the recipient rat in transplantation group and the liver of the rat in control group. PCNA-staining revealed that the native liver in transplantation group had a lower proportion of TUNEL-positive hepatocytes. Conclusion This experimental study confirmed the long-term consequences of combined intestine-auxiliary liver transplantation, and the results suggest that liver/body weight ratio can be increased.