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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Renal+Physiol
2013 ; 304
(11
): F1390-7
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Nitric oxide reduces Cl? absorption in the mouse cortical collecting duct through
an ENaC-dependent mechanism
#MMPMID23515718
Pech V
; Thumova M
; Dikalov SI
; Hummler E
; Rossier BC
; Harrison DG
; Wall SM
Am J Physiol Renal Physiol
2013[Jun]; 304
(11
): F1390-7
PMID23515718
show ga
Since nitric oxide (NO) participates in the renal regulation of blood pressure,
in part, by modulating transport of Na? and Cl? in the kidney, we asked whether
NO regulates net Cl? flux (JCl) in the cortical collecting duct (CCD) and
determined the transporter(s) that mediate NO-sensitive Cl? absorption. Cl?
absorption was measured in CCDs perfused in vitro that were taken from
aldosterone-treated mice. Administration of an NO donor (10 ?M MAHMA NONOate)
reduced JCl and transepithelial voltage (VT) both in the presence or absence of
angiotensin II. However, reducing endogenous NO production by inhibiting NO
synthase (100 ?M N(G)-nitro-L-arginine methyl ester) increased JCl only in the
presence of angiotensin II, suggesting that angiotensin II stimulates NO synthase
activity. To determine the transport process that mediates NO-sensitive changes
in JCl, we examined the effect of NO on JCl following either genetic ablation or
chemical inhibition of transporters in the CCD. Since the application of
hydrochlorothiazide (100 ?M) or bafilomycin (5 nM) to the perfusate or ablation
of the gene encoding pendrin did not alter NO-sensitive JCl, NO modulates JCl
independent of the Na?-dependent Cl?/HCO?? exchanger (NDCBE, Slc4a8), the A cell
apical plasma membrane H?-ATPase and pendrin. In contrast, both total and
NO-sensitive JCl and VT were abolished with application of an epithelial Na(+)
channel (ENaC) inhibitor (3 ?M benzamil) to the perfusate. We conclude that NO
reduces Cl? absorption in the CCD through a mechanism that is ENaC-dependent.