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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
2015 ; 308
(11
): F1268-75
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Antenatal glucocorticoid treatment alters Na+ uptake in renal proximal tubule
cells from adult offspring in a sex-specific manner
#MMPMID25834069
Su Y
; Bi J
; Pulgar VM
; Figueroa J
; Chappell M
; Rose JC
Am J Physiol Renal Physiol
2015[Jun]; 308
(11
): F1268-75
PMID25834069
show ga
We have shown a sex-specific effect of fetal programming on Na(+) excretion in
adult sheep. The site of this effect in the kidney is unknown. Therefore, we
tested the hypothesis that renal proximal tubule cells (RPTCs) from adult male
sheep exposed to betamethasone (Beta) before birth have greater Na(+) uptake than
do RPTCs from vehicle-exposed male sheep and that RPTCs from female sheep
similarly exposed are not influenced by antenatal Beta. In isolated RPTCs from 1-
to 1.5-yr-old male and female sheep, we measured Na(+) uptake under basal
conditions and after stimulation with ANG II. To gain insight into the mechanisms
involved, we also measured nitric oxide (NO) levels, ANG II receptor mRNA levels,
and expression of Na(+)/H(+) exchanger 3. Basal Na(+) uptake increased more in
cells from Beta-exposed male sheep than in cells from vehicle-exposed male sheep
(400% vs. 300%, P < 0.00001). ANG II-stimulated Na(+) uptake was also greater in
cells from Beta-exposed males. Beta exposure did not increase Na(+) uptake by
RPTCs from female sheep. NO production was suppressed more by ANG II in RPTCs
from Beta-exposed males than in RPTCs from either vehicle-exposed male or female
sheep. Our data suggest that one site of the sex-specific effect of Beta-induced
fetal programming in the kidney is the RPTC and that the enhanced Na(+) uptake
induced by antenatal Beta in male RPTCs may be related to the suppression of NO
in these cells.