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• W2106566433 startingPage "1596" @default.
• W2106566433 abstract "Nitric oxide synthase inhibition in the kidney enhances tubuloglomerular feedback (TGF) responsiveness. This may reflect either the effect of reduced basal nitric oxide (NO) availability or the effect of impaired NO release that is physiologically induced by TGF activation. However, it is unknown whether the latter actually takes place. In this study, it was hypothesized that NO is released (from macula densa cells or endothelium) as part of the normal TGF loop, and mitigates the TGF response. In Sprague Dawley rats, TGF responsiveness was assessed (fall in tubular stop flow pressure, deltaSFP, upon switching loop of Henle perfusion rates from 0 to 40 nl/min) during an intrarenal NO clamp (systemic infusion of nitro-L-arginine, 10 microg/kg per min, followed by intrarenal nitroprusside infusion adjusted to restore renal blood flow [RBF]). This maneuver was presumed to fix intrarenal NO impact at a physiologic level. To validate the approach, TGF responsiveness during an intrarenal angiotensin II (AngII) clamp (systemic infusion of enalaprilat 0.2 mg/kg per min, followed by intrarenal AngII infusion) was also studied. AngII is presumed to modulate but not mediate, TGF, thus not to increase as part of the TGF loop. In untreated animals, RBF was 7.4 +/- 0.4 ml/min, and deltaSFP was 5.7 +/- 1.6 mmHg. Nitro-L-arginine infusion alone reduced RBF to 5.3 +/- 0.5 ml/min (P < 0.05); with nitroprusside infusion, RBF was restored to 8.3 +/- 0.7 ml/min. In this condition (NO clamp), deltaSFP was markedly increased to 19.6 +/- 3.2 mmHg (P < 0.05). By contrast, deltaSFP, which was virtually abolished during enalaprilat alone (0.2 +/- 0.3 mmHg), was not significantly different from controls during AngII clamp (8.2 +/- 1.0 mmHg). These data suggest that NO may well be released upon TGF activation. By contrast, AngII is not dynamically involved in TGF activation, but may modulate the TGF response. Thus, dynamic release of NO during TGF activation mitigates the TGF response, so that it will offset the action of a primary, as yet undefined, vasoconstrictor mediator. The source of this NO, macula densa or endothelium, remains to be elucidated." @default.
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• W2106566433 date "1998-09-01" @default.
• W2106566433 modified "2023-10-05" @default.
• W2106566433 title "Nitric oxide release as an essential mitigating step in tubuloglomerular feedback" @default.
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• W2106566433 doi "https://doi.org/10.1681/asn.v991596" @default.
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