期刊
JOURNAL OF CLINICAL INVESTIGATION
卷 116, 期 8, 页码 2272-2279出版社
AMER SOC CLINICAL INVESTIGATION INC
DOI: 10.1172/JCI28414
关键词
-
资金
- NCRR NIH HHS [C06 RR015502, C06RR015502] Funding Source: Medline
- NIDDK NIH HHS [R01 DK064687, R01DK064687] Funding Source: Medline
- NIGMS NIH HHS [R01GM060432, R01 GM060432] Funding Source: Medline
Primary defects in either podocytes or the glomerular basement membrane (GBM) cause proteinuria, a fact that complicates defining the barrier to albumin. Laminin beta 2 (LAMB2) is a GBM component required for proper functioning of the glomerular filtration barrier. To investigate the GBM's role in glomerular filtration, we characterized GBM and overlying podocyte architecture in relation to development and progression of proteinuria in Lamb2(-/-) mice, which model Pierson syndrome, a rare congenital nephrotic syndrome. We found ectopic deposition of several laminins and mislocalization of anionic sites in the GBM, which together suggest that the Lamb2(-/-) GBM is severely disorganized, although it is ultrastructurally intact. Importantly, albuminuria was detectable shortly after birth and preceded podocyte foot process effacement and loss of slit diaphragms by at least 7 days. Expression and localization of slit diaphragm and foot process-associated proteins appeared normal at early stages. GBM permeability to the electron-dense tracer ferritin was dramatically elevated in Lamb2(-/-) mice, even before widespread foot process effacement. Increased ferritin permeability was not observed in nephrotic CD2-associated protein-mill (Cd2ap(-/-)) mice, which have a primary podocyte defect. Together these data show that the GBM serves as a barrier to protein in vivo and that the glomerular slit diaphragm alone is not sufficient to prevent the passage of albumin into the urinary space.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据