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- W4250769951 abstract "First published August 9, 2001; 10.1152/ajprenal.0075.2001.—We have reported that nitric oxide (NO) inhibits thick ascending limb (THAL) chloride absorption ( J Cl − ). NaCl transport in the THAL depends on apical Na + -K + -2Cl − cotransporters, apical K + channels, and basolateral Na + -K + -ATPase. However, the transporter inhibited by NO is unknown. We hypothesized that NO decreases THAL J Cl − by inhibiting the Na + -K + -2Cl − cotransporter. THALs from Sprague-Dawley rats were isolated and perfused. Intracellular sodium ([Na + ] i ) and chloride concentrations ([Cl − ] i ) were measured with sodium green and SPQ, respectively. The NO donor spermine NONOate (SPM) decreased [Na + ] i from 13.5 ± 1.2 to 9.6 ± 1.6 mM ( P < 0.05) and also decreased [Cl − ] i ( P < 0.01). We next tested whether NO decreases Na + -K + -2Cl − cotransporter activity by measuring the initial rate of Na + transport. In the presence of SPM in the bath, initial rates of Na + entry were 49.6 ± 6.0% slower compared with control rates ( P < 0.05). To determine whether NO inhibits apical K + channel activity, we measured the change in membrane potential caused by an increase in luminal K + from 1 to 25 mM using a potential-sensitive fluorescent dye. In the presence of SPM, increasing luminal K + concentration depolarized THALs to the same extent as it did in control tubules. We then tested whether a change in apical K + permeability could affect NO-induced inhibition of THAL J Cl − . In the presence of luminal valinomycin, which increases K + permeability, addition of SPM decreased THAL J Cl − by 41.2 ± 10.4%, not significantly different from the inhibition observed in control tubules. We finally tested whether NO alters the affinity or maximal rate of Na + -K + -ATPase by measuring oxygen consumption rate (Qo 2 ) in THAL suspensions in the presence of nystatin in varying concentrations of Na + . In the presence of 10.5 mM Na + , nystatin increased Qo 2 to 119.1 ± 19.2 and 125.6 ± 23.4 nmol O 2 · mg protein −1 · min −1 in SPM- and furosemide-treated tubules, respectively. In the presence of 145 mM extracellular Na + , nystatin increased Qo 2 by 104 ± 7 and 94 ± 20% in NO- and furosemide-treated tubules, respectively. We concluded that NO decreases THAL J Cl − by inhibiting Na + -K + -2Cl − cotransport rather than inhibiting apical K + channels or the sodium pump." @default.
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- W4250769951 date "2001-11-01" @default.
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- W4250769951 title "NO decreases thick ascending limb chloride absorption by reducing Na<sup>+</sup>-K<sup>+</sup>-2Cl<sup>−</sup>cotransporter activity" @default.
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- W4250769951 doi "https://doi.org/10.1152/ajprenal.0075.2001" @default.
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