首页> 外文期刊>American Journal of Physiology >Evidence that calgranulin is produced by kidney cells and is an inhibitor of calcium oxalate crystallization.
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Evidence that calgranulin is produced by kidney cells and is an inhibitor of calcium oxalate crystallization.

机译:有证据表明钙蛋白是由肾细胞产生的,并且是草酸钙结晶的抑制剂。

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Urine produced by normal human kidneys is almost always supersaturated with respect to calcium oxalate (CaOx), the most common constituent of human kidney stones. Crystallization, with risk of renal damage and kidney stones, appears to be affected by molecules in urine that retard nucleation, growth, aggregation, and renal cell adherence of CaOx. The repertoire of such molecules is incompletely known. We have purified a 28-kDa protein from urine using salt precipitation, preparative isoelectric focusing, and sizing chromatography. Amino acid composition and NH2-terminal amino sequence analysis showed complete homology to calgranulin. Calgranulin was found to be a potent inhibitor of CaOx crystal growth (44% of control) and aggregation (50% of control) in the nanomolar range. Calgranulin cDNA was cloned from a human kidney expression library. Western analysis of human and rat kidney homogenates and mRNA temporal expression from two independent renal epithelial cell lines showed that calgranulin is produced in the kidney. Given its urinary abundance and potency, calgranulin may contribute importantly to the normal urinary inhibition of crystal growth and aggregation and therefore to the renal defense against clinical stone disease.
机译:正常人肾脏产生的尿液相对于草酸钙(CaOx)几乎总是过饱和,草酸钙是人肾结石最常见的成分。结晶具有肾脏损害和肾结石的风险,似乎受到尿液中阻碍CaOx的成核,生长,聚集和肾细胞粘附的分子的影响。此类分子的全部文献是不完全已知的。我们使用盐沉淀,制备性等电聚焦和上浆色谱法从尿液中纯化了28 kDa的蛋白质。氨基酸组成和NH2末端氨基序列分析显示与钙粒蛋白完全同源。发现钙调蛋白是纳摩尔浓度范围内CaOx晶体生长(对照的44%)和聚集(对照的50%)的有效抑制剂。从人肾脏表达文库中克隆出钙粒蛋白cDNA。西方人和大鼠肾脏匀浆和来自两个独立的肾上皮细胞系的mRNA时间表达的Western分析表明,钙蛋白在肾脏中产生。考虑到其尿液的丰富性和效力,钙蛋白可对正常尿液对晶体生长和聚集的正常抑制起重要作用,从而有助于肾脏抵抗临床结石病。

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