血管紧张素Ⅱ对肾成纤维细胞增殖及分泌白细胞介素—6的影响

目的 研究血管紧张素（Ang)Ⅱ对人肾成纤维细胞（KFB）增殖及分泌白细胞介素（IL－6）的影响，为完善Ang Ⅱ致肾纤维化机理提供新实验依据。方法 分离培养人胎肾成纤维细胞，经鉴定后分别采用MTT法和放射免疫分析法（RIA）检测AngⅡ对KFB增殖及分泌IL－6的影响。结果 10^-6mol/L Ang Ⅱ作用于KFB后48及72小时，可明显促进细胞增殖；无AngⅡ刺激时，体外培养的正常人KFB可分泌微量的IL－6，且呈时间依赖性，10^-7-10^-6mol/L Ang Ⅱ作用于细胞6小时，即可迅速而显著地刺激细胞分泌IL－6，10^-6mol/L AngⅡ作用24－48小时，均可显著增加细胞IL－6的分泌。结论 不同浓度的Ang Ⅱ（10^-7-10^-6mol/L)作用于人KFB后，可促进细胞增殖，提高细胞对IL－6的分泌量。推测这可能是在各种肾脏疾病进展时，AngⅡ 参与肾小管间质病变、促进肾纤维化的机制之一。

Effects of angiotensin II on proliferation and expression of interleukin-6 of human kidney fibroblasts]

OBJECTIVE: To investigate the effects of Angiotensin(Ang) II on the proliferation and expression of Interleukin (IL)-6 in human kidney fibroblasts(KFB). METHODS: The human KFB were cultured and identified, the proliferation of KFB was measured by MTT, and the level of IL-6 was measured by radioimmunoassay(RIA). RESULTS: Angiotensin II could stimulate the proliferation of KFB and enhance the expression of IL-6 in protein level on KFB. CONCLUSION: Angiotensin II can stimulate KFB's proliferation and enhance the expression of IL-6 of KFB. These findings suggest that Ang II might play a part in the mechanisms for modulating tubulointerstitial changes and induceing renal fibrosis.