尿毒血清对人类肾小管上皮细胞增殖及转分化的影响

Effects of uremic serum on the proliferation and trans-differentiation of human renal tubular epithelial cells

目的 :探讨尿毒血清对人近端肾小管上皮细胞株 (HK - 2 )增殖及转分化的影响 ,以期阐明尿毒症毒素在人肾小管 -间质纤维化中的作用。方法 :采用MTT比色法检测尿毒血清对细胞增殖的影响 ;采用流式细胞术检测尿毒血清对细胞周期、细胞增殖指数 (PI)及α -平滑肌肌动蛋白 (α -SMA)阳性细胞百分率的影响。结果 :MTT法示 5 % - 2 0 %浓度尿毒血清组A490 值均高于正常对照组 ,流式细胞检测示 10 % - 2 0 %浓度尿毒血清组G1期细胞均低于正常对照组 ,PI指数均高于正常对照组 ,但不同浓度尿毒血清组组间无明显差异 ;各浓度尿毒血清组α -SMA阳性细胞百分率均高于正常对照组 ,且随着尿毒血清浓度的增高而增高。结论 :慢性肾衰竭患者体内蓄积的尿毒症毒素可能通过促进肾小管上皮细胞增殖及转分化从而加速肾小管 -间质纤维化进程 ,导致肾功能进行性恶化。

AIM: To explore the effects of uremic serum on proliferation and trans-differentiation of human renal tubular epithelial cells. METHODS: Human renal tubular epithelial cell line (HK-2) was cultured in RPMI-1640 medium. The proliferation effects of uremic serum at different concentrations were evaluated by methylene blue assay (MTT method) and flow cytometry. The positive cells percentage of α-smooth muscle actin(α-SMA)in different concentration uremic serum medium was also measured by flow cytometry in vitro. RESULTS: Absorbance 490 (A 490) was increased in 5%-20% uremic serum groups compared with that in normal controls with the use of MTT. Cells in G 1 phase were decreased, but proliferation index (PI) was increased in 10%-20% uremic serum groups compared with that in normal controls with the use of flow cytometry. No significant difference of cell proliferation index was found among uremic serum groups. The positive percentage of α-SMA cells was increased significantly in uremic serum groups compared with that in normal controls, and increased in parallel with the increasing of uremic serum concentration. CONCLUSION: Uremic toxin may accelerate renal tubulointerstitial fibrosis through promoting renal tubular epithelial cell proliferation and trans-differentiation in patients with chronic renal failure.