IgA肾病患者血清aIgA1对系膜细胞增殖的影响

目的观察IgA肾病（IgAN）患者与正常人的血清热聚合IgA1（aIgA1）对系膜细胞（MC）增殖的影响。方法收集原发性IgAN患者及健康人的血清标本,利用Jacalin-agarose亲和层析联合Sephacryl S-200HR分子筛层析法分离获得血清单体IgA1（mIgA1）,将mIgA1热聚合为aIgA1。利用患者及正常人的aIgA1分别刺激小鼠MSC-1097系膜细胞株,利用MTT法检测aIgA1对系膜细胞增殖的影响。结果aIgA1刺激48h组的吸光度是24h组的1.59倍（P=0.000）。不同浓度aIgA1刺激组间MTT吸光度的差异有统计学意义（P=0.000）,相比于阴性对照组（SFM）,0.25mg/mL组、0.5mg/mL组、1mg/mL组的吸光度分别为SFM的1.67、1.74、1.77倍（P=0.000）;2mg/mL组的吸光度是SFM的1.15倍（P=0.086）。在刺激24h时患者0.25mg/mL组的aIgA1就可促进系膜细胞增殖了,其吸光度是SFM的1.34倍（P〈0.05）,而正常对照组则要在浓度达到1mg/mL时才引起系膜细胞增殖,其吸光度为SFM的1.33倍（P〈0.05）。结论研究结果提示患者及正常人的aIgA1均可促进系膜细胞增殖,这种增殖表现为时间依赖性及一定的剂量依赖性,在高浓度时aIgA1促系膜细胞增殖的作用消失了;患者的aIgA1可能更易与系膜细胞结合,刺激相同时间时患者低浓度aIgA1既可引起MC增殖。

Effects of aIgA1 from patients with IgA nephropathy on mesangial cell proliferation

Objective] To explore the effects of aIgA1 isolated from both patients with IgAN and healthy controls on proliferation of mesangial cell. Methods] Blood samples of patients with primary IgAN and healthy controls were collected. Serum monomeric IgA1(mIgA1) was isolated with jacalin affinity chromatography and Sephacryl S-200 HR chromatography, then heated to aggregated form(aIgA1). Mouse mesangial cell(MSC-1097) was cultured in vitro, then the effects of aIgA1 on proliferation of mesangial cell through MTT...