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• W2034692449 abstract "We have previously found that aged rats show decreased proximal acidification without changes in NHE3 or V-H(+) ATPase expression in brush border membrane vesicles. However, we did not identify any mechanism underlying these observations. The aim of the present work was to evaluate some of the regulatory systems of proximal acidification that could be affected by aging. We measured plasma concentrations of parathyroid hormone (PTH) and the amount of cAMP in the renal cortex of young and old Wistar rats. PTH plasma concentration was increased in old rats, whereas, although it showed a tendency to increase, the cAMP content in the renal cortex of old rats was not significantly different compared with the cortex of young rats. We measured the abundance of NHE8 isoforms of the Na(+)/H(+) exchanger in brush border membrane vesicles from proximal convoluted tubules (PCT) of young and old rats by western blot analysis. We performed RT-PCR experiments in renal cortex homogenates from both experimental groups to evaluate mRNA expression of NHE3, NHE8 and H(+)ATPase. In senile rats, we detected a decreased abundance (at both gene expression and protein level) of the NHE8 isoform. These results could explain previous observations in which proximal tubule acidification appears affected in aged rats through a decrease in the activity of ethylisopropyl amiloride (EIPA)- and Bafilomycin-sensitive components, without changes in the NHE3 and V-H(+)ATPase abundance in the apical membrane of the PCT." @default.
• W2034692449 created "2016-06-24" @default.
• W2034692449 creator A5031823142 @default.
• W2034692449 creator A5034416738 @default.
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• W2034692449 date "2009-01-31" @default.
• W2034692449 modified "2023-09-27" @default.
• W2034692449 title "Decreased NHE8 isoform expression and defective acidification in proximal convoluted tubules of senile rats" @default.
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• W2034692449 doi "https://doi.org/10.1007/s11357-008-9083-y" @default.
• W2034692449 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2645991" @default.
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• W2034692449 hasPublicationYear "2009" @default.
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