Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-24596

Lourdel, S; Loffing, J; Favre, G; Paulais, M; Nissant, A; Fakitsas, P; Créminon, C; Féraille, E; Verrey, F; Teulon, J; Doucet, A; Deschênes, G (2005). Hyperaldosteronemia and activation of the epithelial sodium channel are not required for sodium retention in puromycin-induced nephrosis. Journal of the American Society of Nephrology (JASN), 16(12):3642-3650.

[img] PDF - Registered users only
1MB

View at publisher

Abstract

Edema and ascites in nephrotic syndrome mainly result from increased Na+ reabsorption along connecting tubules and cortical collecting ducts (CCD). In puromycin aminonucleoside (PAN)-induced nephrosis, increased Na+ reabsorption is associated with increased activity of the epithelial sodium channel (ENaC) and Na+,K+-ATPase, two targets of aldosterone. Because plasma aldosterone increases in PAN-nephrotic rats, the aldosterone dependence of ENaC activation in PAN nephrosis was investigated. For this purpose, (1) the mechanism of ENaC activation was compared in nephrotic and sodium-depleted rats, and (2) ENaC activity in PAN-nephrotic rats was evaluated in the absence of hyperaldosteronemia. The mechanism of ENaC activation was similar in CCD from nephrotic and sodium-depleted rats, as demonstrated by (1) increased number of active ENaC evaluated by patch clamp, (2) recruitment of ENaC to the apical membrane determined by immunohistochemistry, (3) shift in the electrophoretic profile of gamma-ENaC, and (4) increased abundance of beta-ENaC mRNA. Corticosteroid clamp fully prevented all PAN-induced changes in ENaC but did not alter the development of a full-blown nephrotic syndrome with massive albuminuria, amiloride-sensitive sodium retention, induction of CCD Na+,K+-ATPase, and ascites. It is concluded that in PAN-nephrosis, (1) ENaC activation in CCD is secondary to hyperaldosteronemia, (2) sodium retention and induction of Na+,K+-ATPase in CCD are independent of hyperaldosteronemia, and (3) ENaC is not necessarily limiting for sodium reabsorption in the distal nephron.

Citations

28 citations in Web of Science®
28 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

0 downloads since deposited on 18 Dec 2009
0 downloads since 12 months

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Functional Genomics Center Zurich
08 University Research Priority Programs > Systems Biology / Functional Genomics
DDC:570 Life sciences; biology
610 Medicine & health
Language:English
Date:2 November 2005
Deposited On:18 Dec 2009 05:46
Last Modified:28 Nov 2013 00:31
Publisher:American Society of Nephrology
ISSN:1046-6673
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:10.1681/ASN.2005040363
PubMed ID:16267158

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page