大鼠不同体积肝移植术后门静脉血内毒素水平的动态变化

目的 比较大鼠不同体积肝移植术后门静脉血内毒素水平及其受体CDl4和Toll样受体4(TLR4)的变化以探讨肝移植小肝综合征的病因.方法 参照"Kamada二袖套法"和体内切肝法建立SD大鼠→SD大鼠原位100%(Ⅰ组)、50%(Ⅱ组)、30%(Ⅲ组)体积肝移植组和假手术组.于门静脉重新开放后1、3、6、12和24 h检测各组受鼠门静脉内毒素的水平以及肝组织CD14 mRNA和TLR4 mRNA的相对表达量.结果 Ⅰ、Ⅱ组术后门静脉血内毒素血症高峰出现在术后1 h,随后下降,Ⅰ组在术后3 h接近正常,Ⅱ组在术后12 h接近正常;Ⅲ组高峰出现在术后6 h,在术后24 h接近正常.Ⅰ、Ⅱ、Ⅲ组再灌注后CD14 mRNA、TLR4 mRNA相对表达量均明显增加,都在再灌注后3 h达到高峰,后渐下降,较假手术组显著升高(P＜0.01).结论 大鼠原位100%、50%、30%体积肝移植术后出现门静脉内毒素血症,供肝体积越小术后受者内毒素水平越高,持续时间越长,肝组织CD14 mRNA和TLR4 mRNA的相对表达量也越高,持续时间也越长.

The dynamic changes of plasma endotoxin in portal vein following partial liver transplantation in rats

Objective To investigate and compare the dynamic changes of plasma endotoxin and CD14/TLR4 levels in the portal vein following partial liver transplantation in rats. Methods 100 %(group Ⅰ), 50 % (group Ⅱ) and 30 % (group Ⅲ) orthotopic liver transplantation models in the SD rats→SD rats were established in vivo according to "Kamada two-cuff method". Based on the principle of dynamic turbidity law, the plasma endotoxin (EU/ml) levels were determined at the postoperative time points of 1, 3, 6, 12, 24 h in recipients. The mRNA expression levels of CD14 and TLR4 in liver grafts were detected by using real-time RT-PCR. Results Under the condition of no significant difference in surgical factors, the plasma endotoxin levels in the portal vein of groups Ⅱ and Ⅲ were higher than in group Ⅰ , and reached the peak at the first h postoperation. The endotoxin levels in group Ⅱ were lower than in group Ⅲ. The endotoxin levels in sham-operation group were the highest. The mRNA expression levels of CD14 and TLR4 in groups Ⅰ, Ⅱ and Ⅲ were significantly increased as compared with sham-operation group (P＜0. 01). Conclusion There exists portal vein plasma endotoxima in 100 %, 50 % and 30 % orthotopic liver transplantation in the rats. The smaller the graft volume, the higher and longer plasma endotoxin in portal vein, so is the relative quantification of the TLR4 and CD14 mRNA in liver grafts.