Circulating urokinase receptor as a cause of focal segmental glomerulosclerosis.

Circulating urokinase receptor as a cause of focal segmental glomerulosclerosis.
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DOI:
10.1038/nm.2411
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发表时间:
2011-07-31
期刊:
影响因子:
82.9
通讯作者:
--
中科院分区:
医学1区
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--
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局灶节段性肾小球硬化症(FSGS)是蛋白尿肾病的一个原因,损害了天然和移植肾。治疗是有限的,因为一个复杂的发病机制,包括未知的血清因素。在这里,我们报告说,血清可溶性尿激酶受体(suPAR)升高,在三分之二的受试者与原发性FSGS,但不与其他肾小球疾病的人。我们进一步发现,移植前suPAR浓度越高,移植后FSGS复发的风险越高。使用三种小鼠模型,我们探讨suPAR对肾功能和形态学的影响。我们发现,循环suPAR激活足细胞β3整合素在天然和移植肾,引起足突消失,蛋白尿和FSGS样肾小球病。我们的研究结果表明,只有当suPAR充分激活足细胞β3整合素时,肾脏疾病才会发生。因此,通过血浆置换降低血清suPAR浓度,或通过靶向uPAR或β3整联蛋白的抗体和小分子干扰suPAR-β3整联蛋白相互作用,可以消除该疾病。我们的研究确定血清suPAR作为一种循环因子,可能会导致FSGS。
Focal segmental glomerulosclerosis (FSGS) is a cause of proteinuric kidney disease, compromising both native and transplanted kidneys. Treatment is limited because of a complex pathogenesis, including unknown serum factors. Here we report that serum soluble urokinase receptor (suPAR) is elevated in two-thirds of subjects with primary FSGS, but not in people with other glomerular diseases. We further find that a higher concentration of suPAR before transplantation underlies an increased risk for recurrence of FSGS after transplantation. Using three mouse models, we explore the effects of suPAR on kidney function and morphology. We show that circulating suPAR activates podocyte β3 integrin in both native and grafted kidneys, causing foot process effacement, proteinuria and FSGS-like glomerulopathy. Our findings suggest that the renal disease only develops when suPAR sufficiently activates podocyte β3 integrin. Thus, the disease can be abrogated by lowering serum suPAR concentrations through plasmapheresis, or by interfering with the suPAR–β3 integrin interaction through antibodies and small molecules targeting either uPAR or β3 integrin. Our study identifies serum suPAR as a circulating factor that may cause FSGS.
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