遗传性近端小管内吞受体紊乱引起的小管性蛋白尿:凹痕病和慢性良性蛋白尿

IF 2.6 3区 医学 Q1 PEDIATRICS
Pediatric Nephrology Pub Date : 2025-11-01 Epub Date: 2025-03-31 DOI:10.1007/s00467-025-06745-x
Nana Sakakibara, Kandai Nozu
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引用次数: 0

摘要

近端小管有一条高效的内细胞途径,专门用于重吸收通过肾小球滤过屏障的白蛋白和低分子量蛋白质。这一途径依赖于多种配体受体:megalin 和 cubilin。与近端肾小管内吞相关的基因异常可导致肾小管性蛋白尿,即尿液中含有白蛋白和低分子量蛋白质。登特病是一种遗传性 X 连锁疾病,以低分子量蛋白尿、高钙血症、肾钙化、肾结石和进行性肾功能障碍为特征,通常会导致慢性肾功能衰竭五期。CLCN5 是导致 Dent 病-1 的基因,编码电压门控氯离子通道 ClC-5。同时,OCRL 是 Dent 病-2 的致病基因,编码 4,5-二磷酸磷脂肌醇 5-磷酸酶,其变体也与洛氏综合征有关。ClC-5 和 OCRL 对内吞体机制至关重要,它们的缺失会影响内吞体的酸化和贩运,导致巨球蛋白和立方体蛋白循环的中断。编码立方蛋白的 CUBN 最初被确定为 Imerslund-Gräsbeck 综合征的致病基因,该综合征是一种伴有蛋白尿的巨幼红细胞性贫血疾病。然而,最近有研究表明,CUBN 的一个双复制 C 端变体可导致无肾功能障碍的孤立性蛋白尿。这种蛋白尿被认为是一种新的疾病概念,称为慢性良性蛋白尿(proteinuria, chronic benign: PROCHOB),这与蛋白尿有害并最终导致肾脏损伤的普遍观点相悖。这篇文章加深了人们对遗传性肾小管蛋白尿及其起源的认识,重点探讨了近端肾小管中巨球蛋白和立方蛋白介导的内吞作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tubular proteinuria due to hereditary endocytic receptor disorder of the proximal tubule: Dent disease and chronic benign proteinuria.

The proximal tubule has a highly efficient endocytic pathway dedicated to reabsorbing albumin and low-molecular-weight proteins that have passed through the glomerular filtration barrier. This pathway is dependent on multi-ligand receptors: megalin and cubilin. Abnormalities in genes associated with endocytosis in the proximal tubule can lead to tubular proteinuria, where the urine contains albumin and low-molecular-weight proteins. Dent disease is a hereditary X-linked disorder characterized by low-molecular-weight proteinuria, hypercalciuria, nephrocalcinosis, nephrolithiasis, and progressive kidney dysfunction, often leading to CKD stage 5. CLCN5 is the gene responsible for Dent disease-1 and encodes the voltage-gated chloride channel ClC-5. Meanwhile, OCRL is the causative gene of Dent disease-2 and encodes phosphatidylinositol 4,5-bisphosphate 5-phosphatase, and its variants are also associated with Lowe syndrome. ClC-5 and OCRL are essential to the endocytic machinery, and their loss affects endosomal acidification and trafficking, resulting in disruption of megalin and cubilin recycling. CUBN, which encodes cubilin, was originally identified as the causative gene of Imerslund-Gräsbeck syndrome, a disorder of megaloblastic anemia associated with proteinuria. However, recently, a biallelic C-terminal variant of CUBN was shown to be responsible for isolated proteinuria without kidney dysfunction. This proteinuria is recognized as a new disease concept called chronic benign proteinuria (proteinuria, chronic benign: PROCHOB), which contradicts the common belief that proteinuria is harmful and ultimately leads to kidney damage. This article deepens the understanding of genetic tubular proteinuria and its origins, focusing on the role of megalin- and cubilin-mediated endocytosis in the proximal tubule.

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来源期刊
Pediatric Nephrology
Pediatric Nephrology 医学-泌尿学与肾脏学
CiteScore
4.70
自引率
20.00%
发文量
465
审稿时长
1 months
期刊介绍: International Pediatric Nephrology Association Pediatric Nephrology publishes original clinical research related to acute and chronic diseases that affect renal function, blood pressure, and fluid and electrolyte disorders in children. Studies may involve medical, surgical, nutritional, physiologic, biochemical, genetic, pathologic or immunologic aspects of disease, imaging techniques or consequences of acute or chronic kidney disease. There are 12 issues per year that contain Editorial Commentaries, Reviews, Educational Reviews, Original Articles, Brief Reports, Rapid Communications, Clinical Quizzes, and Letters to the Editors.
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