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• W1857369522 endingPage "1265" @default.
• W1857369522 startingPage "1260" @default.
• W1857369522 abstract "Deficiency of folate in heavy-drinking alcoholic populations can occur partly because of an increased urinary folate excretion. Ethanol directly reduces the reabsorption of folate in the renal proximal tubule (PT) by acting on either of 2 folate transport proteins, the reduced folate carrier (RFC) and the folate receptor (FR). This study was designed to determine the effects of ethanol on the transport of folate by PT cells and to examine the effects of ethanol on RFC and the FR protein expression. Normal human PT (HPT) cells were cultured on membrane inserts to study intracellular transport of 5-methyltetrahydrofolate from the apical or basolateral direction in the presence of ethanol [11-109 mmol/L (50-500 mg/dL)]. The long-term effect of ethanol on the renal folate transport protein content was determined by western blot in treated HPT cells and in vivo in rats pair-fed control diets or ethanol-containing liquid diets. A 1-h treatment of HPT cells with ethanol (> or = 65 mmol/L) reduced the apically directed transport of folate by 20-25% without affecting the basolateral transport. A 5-d exposure of HPT cells to ethanol dose-dependently increased the content of both the FR and RFC proteins, with a greater effect on the RFC. Similarly, a 14-d exposure of rats to ethanol increased the in vivo expression of both the RFC and FR. These studies demonstrate that ethanol decreases the reabsorptive transport of folate by renal PT cells, which would increase urinary folate excretion. In contrast, subchronic exposure of PT cells, both in vivo and in vitro, to folate-depleting concentrations of ethanol leads to an upregulation of the 2 folate transport proteins. The increase in folate transporters partly counteracts the inhibitory effects of ethanol on folate transport activity, which explains the lower magnitude of ethanol's effect on transport with subchronic exposure compared with that with acute exposure." @default.
• W1857369522 created "2016-06-24" @default.
• W1857369522 creator A5021284193 @default.
• W1857369522 creator A5025024613 @default.
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• W1857369522 date "2007-05-01" @default.
• W1857369522 modified "2023-10-18" @default.
• W1857369522 title "Acute Ethanol Exposure Inhibits Renal Folate Transport, but Repeated Exposure Upregulates Folate Transport Proteins in Rats and Human Cells" @default.
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• W1857369522 doi "https://doi.org/10.1093/jn/137.5.1260" @default.
• W1857369522 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17449590" @default.
• W1857369522 hasPublicationYear "2007" @default.
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