老年大鼠供肝应用的实验研究

目的 研究老年大鼠供肝的应用,并探讨老年大鼠肝移植供体年龄限制.方法 采用肝动脉重建二袖套原位肝移植技术,建立大鼠原位肝移植模型,供受体均为雄性Wistar大鼠,受体鼠龄均为5月,根据供体鼠龄分组,A～E组供体鼠龄分别为5、17、20、23、26月,每组12例.检测术后第1、3、7天血清丙氨酸转氨酶(ALT)水平,并观察组织病理学变化和术后3月存活率.结果 B、C和D组肝移植术后第1天和第3天ALT与A组比较差异均有显著性(P<0.05),第7天差异无显著性(P>0.05),肝功能恢复延迟,肝功能于术后第7天趋于稳定.老年大鼠移植肝植入前组织病理学表现存在轻度肝纤维化,老年大鼠肝细胞数目减少,脂褐素数量增加.E组术后ALT增高(P<0.05),肝功能损伤不可恢复,3月存活率为0.结论 供体年龄是影响老年供肝移植疗效的重要因素之一,鼠龄低于23月的老年大鼠移植肝可恢复功能.

Abstract：

Objective To investigate the application of donor livers from aging rats, and discuss the age limit of the donor rats liver transplantation. Methods Arterialized, two-cuff technique orthotopic liver transplantation was performed in male Wistar rats. All the recipient rats were 5 months old, and the ages of the donor rats were 5 (group A), 17 (group B), 20 (group C), 23 (group D), and 26 (group E) months (n=12). The postoperative function recovery and pathological changes of the liver grafts were evaluated by serum alanine aminotransferase (ALT) detection and histopathological examination, and the 3-month survival rate of the rats was observed. Results Aging liver grafts in groups B, C, and D caused early elevation of ALT peak level and aggravation of liver tissue damage, and the liver graft recovery was delayed until postoperative day 7. Mild liver fibrosis, reduced hepatocytes and pigment deposition were observed in the liver grafts before the transplantation. Compared with the other groups, the rats in group E showed significantly increased ALT levels after the transplantation (P<0.05), with failure of liver graft function recovery and significantly reduced 3-month survival rate (0%, P<0.05). Conclusion The donor age of the rats is a crucial factor to affect the outcome of the liver grafts. Grafts obtained from rats younger than 23 months allow better functional recovery of the liver.

Application of aging donors in rat liver transplantation

Objective To investigate the application of donor livers from aging rats, and discuss the age limit of the donor rats liver transplantation. Methods Arterialized, two-cuff technique orthotopic liver transplantation was performed in male Wistar rats. All the recipient rats were 5 months old, and the ages of the donor rats were 5 (group A), 17 (group B), 20 (group C), 23 (group D), and 26 (group E) months (n=12). The postoperative function recovery and pathological changes of the liver grafts were evaluated by serum alanine aminotransferase (ALT) detection and histopathological examination, and the 3-month survival rate of the rats was observed. Results Aging liver grafts in groups B, C, and D caused early elevation of ALT peak level and aggravation of liver tissue damage, and the liver graft recovery was delayed until postoperative day 7. Mild liver fibrosis, reduced hepatocytes and pigment deposition were observed in the liver grafts before the transplantation. Compared with the other groups, the rats in group E showed significantly increased ALT levels after the transplantation (P<0.05), with failure of liver graft function recovery and significantly reduced 3-month survival rate (0%, P<0.05). Conclusion The donor age of the rats is a crucial factor to affect the outcome of the liver grafts. Grafts obtained from rats younger than 23 months allow better functional recovery of the liver.