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- W2105226872 abstract "To determine the role of endogenous superoxide (O2-) in the kidney, we assessed renal hemodynamics and excretory function in gp91(PHOX) (a NAD(P)H oxidase subunit) gene knockout (KO) mice and compared these findings with those of wild-type (WT) strain C57BL/6 mice. Renal blood flow (RBF) and glomerular filtration rate (GFR) were determined by PAH and inulin clearances respectively in anesthetized mice (n=8 in each group). There were higher baseline RBF (4.3+/-0.4 versus 2.5+/-0.2 mL/min per gram; P<0.002) and lower renal vascular resistance (RVR) (16+/-1.4 versus 29+/-2.3 mm Hg/mL/min per gram; P<0.0001) in KO compared with WT without a significant difference in mean arterial pressure (MAP) (67+/-2 versus 71+/-2 mm Hg) and GFR (0.66+/-0.09 versus 0.73+/-0.05 mL/min per gram) between the strains. Intravenous infusion of angiotensin II (Ang II) (2 ng/min per gram of body weight) for 30 minutes caused a lesser degree of decreases in RBF (-8% versus -33%) and of increases in RVR (+73% versus +173%) in KO compared with WT. GFR was increased (43%) in KO but not in WT during Ang II infusion. Urinary excretion of nitrate/nitrite was higher in conscious KO (n=5) than in WT (n=5), indicating an increase in nitric oxide bioavailability that could be the cause of high RBF and low RVR in KO. These data indicate that gp91(PHOX), a subunit of NAD(P)H oxidase, plays a regulatory role in the maintenance of renal vascular tone. These results also suggest that the mechanism of Ang II-mediated renal vascular action involves concomitant generation of O2-." @default.
- W2105226872 created "2016-06-24" @default.
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- W2105226872 date "2004-02-01" @default.
- W2105226872 modified "2023-09-25" @default.
- W2105226872 title "Assessment of Renal Functional Phenotype in Mice Lacking gp91 <sup>PHOX</sup> Subunit of NAD(P)H Oxidase" @default.
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- W2105226872 doi "https://doi.org/10.1161/01.hyp.0000111137.15873.4a" @default.
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