首页> 外文期刊>Clinical immunology: The official journal of the Clinical Immunology Society >Urine levels of CD46 (membrane cofactor protein) are increased in patients with glomerular diseases.
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Urine levels of CD46 (membrane cofactor protein) are increased in patients with glomerular diseases.

机译:肾小球疾病患者的尿液中CD46(膜辅因子蛋白)水平升高。

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Soluble membrane cofactor protein (MCP, CD46) has not been detected by conventional ELISA in human urine. Here, we established a highly sensitive assay method for determination of urinary MCP (uMCP) using monoclonal antibody-coated paramagnetic beads. This method enabled us to detect less than 0.05 ng/ml of purified membrane and recombinant soluble MCP, a sensitivity 10-fold higher than that of conventional ELISA. In normal subjects, the levels of uMCP were <0. 05 ng/ml. The levels of uMCP were elevated in patients with IgA nephropathy and more prominently in patients with rapidly progressive glomerulonephritis. The levels of uMCP were correlated significantly with those of serum MCP (sMCP) and N-acetyl-beta-glucosaminidase and nonsignificantly with those of beta(2)-microglobulin, total urine protein, or serum creatinine. The properties of uMCP were inconsistent with those of the reported sMCP, since uMCP showed three bands on SDS-PAGE/immunoblotting with molecular mass profiles different from those of sMCP. uMCP exhibited factor I cofactor activity for cleavage of C3b comparable to that of sMCP. The origin of uMCP, however, remains to be determined. These results, taken together with the parameter correlation profiles, suggested that uMCP is secreted or produced secondary to tubular or glomerular damage. The physiological role and clinical significance of uMCP are now within the scope of our investigation by establishment of this assay. Copyright 2000 Academic Press.
机译:常规ELISA尚未在人尿中检测到可溶性膜辅因子蛋白(MCP,CD46)。在这里,我们建立了使用单克隆抗体包被的顺磁珠测定尿中MCP(uMCP)的高灵敏度测定方法。这种方法使我们能够检测到少于0.05 ng / ml的纯化膜和重组可溶性MCP,灵敏度比传统ELISA高10倍。在正常受试者中,uMCP的水平<0。 05 ng / ml。 IgA肾病患者的uMCP水平升高,而快速进展性肾小球肾炎患者的uMCP水平升高。 uMCP的水平与血清​​MCP(sMCP)和N-乙酰基-β-氨基葡萄糖苷酶显着相关,与β(2)-微球蛋白,总尿蛋白或血清肌酐无显着相关。 uMCP的特性与已报道的sMCP不一致,因为uMCP在SDS-PAGE /免疫印迹上显示出三个带,其分子量分布与sMCP不同。 uMCP对C3b的切割表现出与sMCP相当的因子I辅助因子活性。但是,uMCP的来源尚待确定。这些结果与参数相关性曲线一起表明,uMCP是继肾小管或肾小球损害后分泌或产生的。 uMCP的生理作用和临床意义现在已通过建立该测定法纳入我们的研究范围内。版权所有2000学术出版社。

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