移植肾转化生长因子β1与远期肾功能的关系

目的：探讨移植肾内转化生长因子β1（TGF-β1）的表达与远期肾功能的关系。方法：对168例肾功能正常的肾移植患者检测尿TGF-β1含量，所得相对浓度为151.3~521.7（pg/mg.Cr），分别选出浓度最高和最低的各20例患者构成A组、B组。检测2组血TGF-β1浓度；2组分别有15例和12例患者进行了移植肾穿剌活检，通过免疫荧光检测活检组织中TGF-β1蛋白的表达；3年后，比较2组肾功能有无差异，对肾功能不全者作移植肾穿剌活检，明确移植肾在病理上是否为非特异性损害（即慢性移植肾肾病的改变）。结果：2组患者血TGF-β1浓度没有明显差异；A组活检显示在肾小管基底膜等处有大量的TGF-β1表达，其免疫荧光强度为（10.52±2.36）×106，明显大于B组［（6.48 ±1.53）×106］；3年后，A组肌酐清除率（Ccr）减少了（17.6±6.9） ml/min、有7例患者肾功能不全，与B组比较有显著差异（B组分别为（6.3±4.4） ml/min和1例）；肾功能不全的患者，移植肾穿剌活检均证实为慢性移植肾肾病。结论： TGF-β1与慢性移植肾肾病的发生有着密切的关联；肾移植后检测尿TGF-β1对远期肾功能具有预测作用；移植肾TGF-β1高表达者远期肾功能差。

TGF-β1 in allograft and long-term renal function

OBJECTIVE: To determine the relation between transforming growth factor beta1 (TGF-beta1) in allograft and long-term renal function. METHODS: Urine TGF-beta1 relative concentration (divided by urine creatinine) was tested in 168 recipients whose renal function was normal between August 1, 2000 and March 31, 2001. Twenty patients with higher urine TGF-beta1 relative concentrations formed Group A, and another 20 patients with lower urine TGF-beta1 formed Group B. In both groups biopsies were carried out in 15 cases and 12 cases respectively, and TGF-beta1 in the biopsis was tested by immunofluorescence. Blood TGF-beta1 concentrations in the 2 groups were also tested. Three years later, the renal function was compared between the 2 groups. Biopsies were carried out in renal recipients whose creatinine was higher than that of the normal. RESULTS: Blood TGF-beta1 concentrations in the 2 groups were not different significantly; 3 years after the transplantation, there was more loss of renal function and more chronic allograft nephropathy (CAN) cases in Group A than in Group B. Expression of TGF-beta1 in the allografts was higher in Group A than in Group B. The differences in the 2 groups were significant. CONCLUSION: The findings suggest that the higher expression of TGF-beta1 in the allografts is associated with the lower long-term survival rate of kidney graft. The level of urine TGF-beta1 after the renal transplantation can predict the long-term renal function.