Linked Life Data

12902618

Source:http://linkedlifedata.com/resource/pubmed/id/12902618

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2003-8-6
pubmed:abstractText
Administration of a specific combination of anti-aminopeptidase A (APA) mAb (ASD-37/41) in mice induces an acute albuminuria which is independent of angiotensin II, a well-known substrate of APA. In the present experiments, we examined whether binding of the mAb initiated changes in the podocytic expression of cytoskeleton (-associated), adhesion and slit-diaphragm proteins in relation to the time course of albuminuria. In addition, we measured ultrastructurally the extent of foot process retraction (the number of foot processes per microm GBM) and the width of the slit pore between the podocytes by morphometric methods. An injection of the mAb combination ASD-37/41 induced a massive but transient albuminuria that started at 6 h, and peaked at 8 h, after which it declined. However, even at day 7 after injection of the mAbs some albuminuria was present. Injection of the combination ASD-3/41 or saline did not induce an albuminuria. Notably, we observed changes in the staining of CD2AP and podocin, two slit-pore-associated proteins that coincided with the start of the albuminuria. Nephrin staining was reduced and podocytic actin staining became more granular only at a time albuminuria was declining (24 h). The number of foot processes per microm GBM was already decreased at 4 h with a further reduction thereafter. The width of the slit pore was unchanged at the time of peak albuminuria and gradually decreased thereafter. At day 7, podocytic foot process effacement was even more prominent although albuminuria was only slightly abnormal. Expression of CD2AP was still granular. We observed however a change toward normal in the expression of podocin. Injection of saline or ASD-3/41 had no effect on the expression of podocytic proteins, the number of foot processes or width of the slit pore. Our data show that the onset of albuminuria in the anti-APA model is related to alterations in CD2AP and podocin, proteins that are important for maintaining slit-diaphragm structure and podocytic function. Extended studies at day 7 demonstrated uncoupling of albuminuria, podocytic foot process effacement and CD2AP staining. Changes in podocin more closely paralleled changes in albuminuria.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1660-2129
pubmed:author
pubmed:copyrightInfo
Copyright 2003 S. Karger AG, Basel
pubmed:issnType
Electronic
pubmed:volume
94
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
e85-93
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Podocyte changes after induction of acute albuminuria in mice by anti-aminopeptidase A mAb.
pubmed:affiliation
Department of Pathology, Division of Nephrology, University Medical Center, Nijmegen, The Netherlands. h.dijkman@pathol.umcn.nl
pubmed:publicationType
Journal Article