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• W2164718846 endingPage "G863" @default.
• W2164718846 startingPage "G857" @default.
• W2164718846 abstract "Electroneutral Na absorption occurs in the intestine via sodium-hydrogen exchanger (NHE) isoforms NHE2 and NHE3. Bicarbonate and butyrate both stimulate electroneutral Na absorption through NHE. Bicarbonate- but not butyrate-dependent Na absorption is inhibited by cholera toxin (CT). Long-term exposure to butyrate also influences expression of apical membrane proteins in epithelial cells. These studies investigated the effects of short- and long-term in vivo exposure to butyrate on apical membrane NHE and mRNA, protein expression, and activity in rat ileal epithelium that had been exposed to CT. Ileal loops were exposed to CT in vivo for 5 h and apical membrane vesicles were isolated. 22Na uptake was measured by using the inhibitor HOE694 to identify NHE2 and NHE3 activity, and Western blot analyses were performed. CT reduced total NHE activity by 70% in apical membrane vesicles with inhibition of both NHE2 and NHE3. Reduced NHE3 activity and protein expression remained low following removal of CT but increased to control values following incubation of the ileal loop with butyrate for 2 h. In parallel there was a 40% decrease in CT-induced increase in cAMP content. In contrast, NHE2 activity partially increased following removal of CT and was further increased to control levels by butyrate. NHE2 protein expression did not parallel its activity. Neither NHE2 nor NHE3 mRNA content were affected by CT or butyrate. These results indicate that CT has varying effects on the two apical NHE isoforms, inhibiting NHE2 activity without altering its protein expression and reducing both NHE3 activity and protein expression. Butyrate restores both CT-inhibited NHE2 and NHE3 activities to normal levels but via different mechanisms." @default.
• W2164718846 created "2016-06-24" @default.
• W2164718846 creator A5023833196 @default.
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• W2164718846 creator A5056444185 @default.
• W2164718846 creator A5071982784 @default.
• W2164718846 creator A5079465137 @default.
• W2164718846 date "2007-10-01" @default.
• W2164718846 modified "2023-10-15" @default.
• W2164718846 title "Differential regulation of cholera toxin-inhibited Na-H exchange isoforms by butyrate in rat ileum" @default.
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• W2164718846 doi "https://doi.org/10.1152/ajpgi.00462.2006" @default.
• W2164718846 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17690171" @default.
• W2164718846 hasPublicationYear "2007" @default.
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