供者年龄与肾移植慢性排斥反应关系的实验研究

目的 探讨供者的年龄对大鼠同种异体肾移植慢性排斥反应的影响。方法 分别采用3、12、18个月龄的F－344大鼠肾移植给6个月大小的LEW受鼠，以自体肾移植作为对照组，术后检测各组的肾功能和免疫组化的改变，并进行移植肾的组织学观察。结果 18个月龄供肾移植组术后24h尿蛋白含量、移植肾肾小球硬化程度及纤维化程度均较3个月龄及12个月龄组严重，差异有显著性（P＜0.01）；18个月龄的供肾移植组移植肾组织中ED1^＋单核／巨噬细胞、CD4^＋T淋巴细胞及CD8^ 细胞毒性／抑制性T淋巴细胞明显高于3个月龄供肾组，差异有显著性（P＜0.01）。结论 供者的年龄越大，术后移植肾的肾小球硬化及间质纤维化就出现越早，且越严重。

Effect of donor age on chronic renal allograft rejection in rats

Objective　To investigate the contribution of donor age to chronic renal allograft rejection.Methods　F-344 rat kidney allografts (3、12、18 months) were placed in bilaterally nephrectomized LEW recipients with 6 months. Age matched single and perfused kidneys in naive animals served as controls. Renal function,structural changes and immunohistological changes were examined after operation in each group.Results　The content of urinary protein (mg/24!h) was higher and glomerulosclerosis and fibrosis were severer in 18-month donor renal allografts than in the 3 or 12-month kidney grafts (P<0.01). ED1+ mononuclear cells/macrophages,CD4+T lymphocytes and CD8+ cytotoxic/inhibitory T lymphocytes in the renal tissue of 18-month donor renal allografts were obviously higher than in those of 3-month kidney grafts (P<0.01).Conclusions　The older donor is, the earlier and severer chronic graft failure including glomerulosclerosis and fibrosis occurs.