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- W2599115471 abstract "The sodium bicarbonate cotransporter NBCe2 (encoded by SLC4A5) partially regulates renal tubular sodium bicarbonate transport. Hypothesis: since SLC4A5 single nucleotide polymorphisms (SNPs, rs10177833 and rs7571842) are associated with salt sensitivity of blood pressure, the gene product, NBCe2, would be involved with the etiology of human salt sensitivity. NBCe2 was localized in freshly fixed renal tissue and in primary and immortalized RPT cell (RPTC) cultures from tissue or isolated from urine. Basal expression of NBCe2 mRNA and protein was not different between RPTCs carrying WT or HV SLC4A5 before or after dopaminergic or angiotensin (II and III) stimulation. However, total transcellular sodium transport, NHE3 protein expression, and Cl-/HCO3- exchanger activity were higher in SLC4A5 HV than WT RPTCs (WT: 8.6±1.2 mM NaCl n=6, 5207.1±386.4 RFU n=36, 0.265±0.006 pH unit/min, n=33 respectively; VS HV: 14.75±0.7 mM NaCl n=4, 6946.2±500.4 RFU n=48, 0.314±0.018 pH unit/min n=35 respectively, p<0.01). Aberrant sodium transport was even more evident after increasing intracellular sodium, which resulted in increased NBCe2 mRNA, NBCe2 protein and bicarbonate transport in HV RPTCs compared to WT (WT 146% ± 24% , 109% ± 4.7%, 89% ± 4.5%, respectively, VS HV 214% ± 23%, 128% ± 5.7%, 141% ± 4.8%, respectively N=8-12, p<0.05). RPTCs carrying HV variants showed increased binding of HNF4A to SLC4A5 DNA, which was blocked by two HNF4A antagonists. Assays in RPTCs isolated from urine showed increased bicarbonate-dependent pH recovery in RPTCs from salt-sensitive subjects who are HV for SLC4A5. NBCe2 under high sodium is hyper-responsive in RPTCs carrying SLC4A5 HV through an aberrant HNF4A-mediated mechanism." @default.
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- W2599115471 date "2015-09-01" @default.
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- W2599115471 title "Abstract P242: Role of Human Renal Proximal Tubule Sodium Bicarbonate Cotransporter NBCe2 (SLC4A5) in Salt Sensitivity of Blood Pressure" @default.
- W2599115471 doi "https://doi.org/10.1161/hyp.66.suppl_1.p242" @default.
- W2599115471 hasPublicationYear "2015" @default.
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