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- W2017272859 abstract "Nitric oxide (NO) exerts profound effects on renal physiology [1—41. Renal NO generation occurs in endothelial cells by the constitutive isoform of nitric oxide synthase (cNOS) and in macrophages, smooth muscle and mesangial cells by the inducible isoform (iNOS). The former system plays an important role in basal renal vascular tone and hemodynamic regulation, in mesangial contraction, renin release and tubuloglomerular feedback. The inducible NOS, widely distributed in the rat kidney, predominantly in the outer medulla and in cortical glomeruli [5], counterbalances vasoconstrictive, thrombogenic and proliferative stimuli associated with cytokine stimulation and inflammatory responses [6]. Intact nitrovasodilation is particularly important at the outer medulla, where tissue oxygen tension as low as 30 mm Hg normally exists [7]. Inhibition of NOS results in profound renal hypoperfusion, both at the cortex and outer medulla [8, 9], associated with substantial aggravation of medullary hypoxia [10]. Blockade of NO synthesis potentiates medullary hypoxic injury from radiocontrast and non-steroidal anti-inflammatory agents [9—111 and augments medullary hypoperfusion and damage during acute ureteral obstruction [121. Recently developed Clark-type selective NO microelectrodes enable real-time monitoring of NO concentrations in vitro in cell lines and incubated tissues [13—17], in organs maintained ex vivo [18] or in the living organism [19, 20]. With concomitant determination of intrarenal blood flow it could be a potent experimental tool for the evaluation of the role of NO in renal hemodynamics. In preliminary studies with the NO electrode, a paradoxical increase in medullary NO reading was noted following NOS inhibition. This led us to evaluate potential artifacts of NO monitoring, such as fluctuations in tissue oxygenation (since oxygen and reactive oxygen species scavenges NO with the production of NO2/NO3 , not sensed by the electrode) and temperature (which markedly affect the electrode current) [21]. Methods" @default.
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- W2017272859 title "Intrarenal nitric oxide monitoring with a Clark-type electrode: Potential pitfalls" @default.
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- W2017272859 doi "https://doi.org/10.1038/ki.1997.223" @default.
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