Abstract P336: Excreted Living Renal Proximal Tubule Cells (RPTC) Demonstrate Increased Sodium and Bicarbonate Transport in Inverse Salt Sensitive Individuals Using a Patch Clamp Instrument
| Autor: | Peng Xu, Katherine A Schiermeyer, John J Gildea, Hanh T Tran, Robert M Carey, Robin A Felder |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Hypertension. 70 |
| ISSN: | 1524-4563 0194-911X |
| DOI: | 10.1161/hyp.70.suppl_1.p336 |
| Popis: | In our previous clinical studies of salt sensitivity of blood pressure, we have demonstrated that approximately 11% of study participants have a paradoxical increase in ≥7mm of Hg blood pressure on a low NaCl diet (5 meq/day) vs a high NaCl diet (300 meq/day). We define these participants as having inverse salt sensitivity (ISS) while salt resistant (SR) participants demonstrate ≤7mm Hg. RPTCs from 2 ISS and 2 salt resistance (SR) participants were patch clamped and ramp currents were recorded using a voltage ramp protocol from -100 to +45 mV within 200 ms in at least 5 experiments for each cell line. Activity of sodium transporters was probed by exchanging an 80 mM Na + with a 140 mM Na + buffer. Na + transport was significantly increased during the low salt to high salt exchange (ISS1: 80mM Na+ 90.6 ± 17.78 pA VS 140 mM Na, 192.8 ± 47.67 pA, n=9, P+ buffer in ISS cells was significantly increased when compared to salt resistant (SR) (normal) participants indicating ISS cells have more sodium channel activity than SR cells (ISS 2.07 ± 0.01, n=2 VS SR 1.3 ± 0.1, n=2, P+ gluconate to NaHCO3, while SR cells didn’t show any difference when switching Na + gluconate to NaHCO3 (ISS1: Gluconate 461.5 ± 226.6 pA VS 1932 ± 658.7 pA, n=8, P/ gluconate ratios, ISS cells demonstrated an increased ratio over the SR cells (ISS 8.65 ± 2.35, n=2 VS SR 1.11 ± 0.01, n=2, p=0.08) indicating a sodium bicarbonate transporter is hyperactive in ISS cells. Many transporters can be contribute to ISS, therefore we will selectively silence the sodium and bicarbonate transporters to determine which one(s) contribute to the etiology of ISS which then could be targeted for therapeutic intervention. |
| Databáze: | OpenAIRE |
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