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Hypertension. 2002;40:511-515
Published online before print August 19, 2002, doi: 10.1161/01.HYP.0000032100.23772.98
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(Hypertension. 2002;40:511.)
© 2002 American Heart Association, Inc.


Scientific Contributions

Role of p47phox in Vascular Oxidative Stress and Hypertension Caused by Angiotensin II

Ulf Landmesser; Hua Cai; Sergey Dikalov; Louise McCann; Jinah Hwang; Hanjoong Jo; Steven M. Holland; David G. Harrison

From the Division of Cardiology, Emory University School of Medicine and Atlanta Veterans Administration Hospital (U.L., H.C., S.D., L.M., J.H., H.J., D.G.H.), Atlanta, Ga; and Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, National Institutes of Health (S.M.H.), Bethesda, Md.

Correspondence to David G. Harrison, MD, Division of Cardiology, Emory University School of Medicine, 1639 Pierce Drive, 319 WMB, Atlanta, GA 30322. E-mail dharr02{at}emory.edu


*    Abstract
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Hypertension caused by angiotensin II is dependent on vascular superoxide (O2·-) production. The nicotinamide adenine dinucleotide phosphate (NAD[P]H) oxidase is a major source of vascular O2·- and is activated by angiotensin II in vitro. However, its role in angiotensin II-induced hypertension in vivo is less clear. In the present studies, we used mice deficient in p47phox, a cytosolic subunit of the NADPH oxidase, to study the role of this enzyme system in vivo. In vivo, angiotensin II infusion (0.7 mg/kg per day for 7 days) increased systolic blood pressure from 105±2 to 151±6 mm Hg and increased vascular O2·- formation 2- to 3-fold in wild-type (WT) mice. In contrast, in p47phox-/- mice the hypertensive response to angiotensin II infusion (122±4 mm Hg; P<0.05) was markedly blunted, and there was no increase of vascular O2·- production. In situ staining for O2·- using dihydroethidium revealed a marked increase of O2·-production in both endothelial and vascular smooth muscle cells of angiotensin II-treated WT mice, but not in those of p47phox-/- mice. To directly examine the role of the NAD(P)H oxidase in endothelial production of O2·-, endothelial cells from WT and p47phox-/- mice were cultured. Western blotting confirmed the absence of p47phox in p47phox-/- mice. Angiotensin II increased O2·- production in endothelial cells from WT mice, but not in those from p47phox-/- mice, as determined by electron spin resonance spectroscopy. These results suggest a pivotal role of the NAD(P)H oxidase and its subunit p47phox in the vascular oxidant stress and the blood pressure response to angiotensin II in vivo.


Key Words: oxidative stress • endothelium • angiotensin II • hypertension, experimental


*    Introduction
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Activation of the renin angiotensin system is critically involved in the pathogenesis of hypertension and atherosclerosis.1 The recently completed Heart Outcomes Prevention Evaluation (HOPE) trial demonstrated a remarkable decrease in cardiovascular morbidity and mortality by ACE inhibition in individuals at increased risk for cardiovascular events.2 A major mechanism whereby angiotensin II, the principal effector peptide of the renin-angiotensin system, may contribute to vascular pathology is stimulation of superoxide (O2·-) formation in vascular cells.3,4 We and others have shown that treatment with liposome-encapsulated superoxide dismutase (SOD) or the membrane-permeable SOD mimetic tempol markedly blunts the increase in blood pressure caused by angiotensin II administration, suggesting that stimulation of O2·- formation is critically involved in the blood pressure response to angiotensin II.5,6

One source of O2·- that is stimulated by angiotensin II in endothelial and vascular smooth muscle cells is the nicotinamide adenine dinucleotide phosphate (NAD[P]H) oxidase.3,7,8 Several recent in vitro studies have suggested an important role of the p47phox subunit of the NAD(P)H oxidase for angiotensin II stimulated O2·- production in vascular smooth muscle cells.8,9 It is not known, however, whether activation of the NAD(P)H oxidase and its subunit p47phox are critical for angiotensin II-stimulated O2·- production in endothelial cells. To address this issue, we studied mice lacking p47phox, a cytosolic subunit of the NAD(P)H oxidase,10 and examined responses to angiotensin II administered chronically in vivo. We also cultured endothelial cells from these mice and examined the effect of angiotensin II on O2·- production in vitro.


*    Methods
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Animals Studied
Male C57BL/6 mice were obtained from Jackson Laboratories (25 to 35 g; Bar Harbor, Me) and were used at the age of 6 to 8 months. Male mice lacking p47phox10 were backcrossed at least x7 to the C57BL/6 background and were used at the age of 6 to 8 months. For implantation of osmotic minipumps, the mice were anesthetized with intraperitoneal Avertin 2.5% (0.3 mL per 25 g of body weight, IP). The intrascapular region was shaved, and an osmotic minipump (Alzet Model 2002; Alza Corp) that contained angiotensin II was inserted via a 1-cm incision to permit subcutaneous infusion of angiotensin II ([Val5]angiotensin II, infusion rate 0.7 mg/kg per day). Sham-operated animals underwent an identical surgical procedure, except that either no pump or an empty osmotic pump was implanted. On day 7 of angiotensin II infusion, the animals were killed by CO2 inhalation, and their aortas were harvested for study. The Emory University Institutional Animal Care and Use Committee approved all animal experiments.

Blood Pressure Measurement
Systolic blood pressures were measured by a computerized tail-cuff system (Visitech Systems).11 Before the osmotic pump was implanted, the mice were trained in the blood pressure device to accustom them to the procedure. On each day of blood pressure determination, 10 measurements were obtained and averaged for each mouse.

Measurements of Vascular Superoxide Production
Animals were euthanized by CO2 inhalation. The aortas were rapidly removed and placed into chilled modified Krebs/HEPES buffer (composition in mmol/L: NaCl 99.01, KCl 4.69, CaCl2 2.50, MgSO4 1.20, KH2PO4 1.03, NaHCO3 25.0, Na-HEPES 20.0, and glucose 5.6; pH 7.4), cleaned of excessive adventitial tissue, and cut into 4- to 5-mm ring segments with care taken not to injure the endothelium. Vascular O2·- production was determined using lucigenin-enhanced chemiluminescence as described before.12 This method has recently been validated for O2·- measurements in vascular tissue when low concentrations of lucigenin (5 µmol/L) are used.13,14

As a second approach to quantify vascular O2·- production, we employed dihydroethidium (HE) staining of intact vascular rings as described previously.15 Paired aortas from Angiotensin II-infused and sham animals were processed in parallel, and images were acquired with identical acquisition parameters. Reagents were purchased from Sigma-Aldrich.

Measurements of Superoxide Production in Cultured Endothelial Cells
Mouse aortic endothelial cells (MAECs) from wild-type and p47phox-/- mice were isolated using a matrigel culture as described previously and selected over vascular smooth muscle cells using heparin.16 Cells were maintained in DMEM (Gibco-BRL) containing 10% fetal calf serum (FCS, Hyclone Laboratories) supplemented with endothelial cell growth supplement (ECGS; 75 µg/mL; Sigma E-2759), heparin (10 U/mL), and antibiotics. Endothelial cells were used for studies at passage 3. On the day of confluence, the cell media was changed to DMEM with 5% serum overnight, and cells were studied the next day, one day post-confluency. Endothelial cell O2·- production was measured using electron-spin resonance spectroscopy (ESR) and the spin trap 1-hydroxy-3-carboxy-pyrrolidine (CP-H; Alexis Corporation). Cells were rinsed with ice-cold 50 mmol/L PBS buffer (pH 7.4) and removed from the plate by scrapping. After centrifugation at 800g (7 minutes), the cells were resuspended in 400 µL PBS buffer and kept on ice. To inhibit iron-catalyzed oxidation of the spin trap, DTPA (0.2 mmol/L) was added to all samples. ESR measurements were performed in 50-µL glass capillaries (Corning). The ESR spectra were recorded using a Bruker EMX spectrometer (Bruker Corporation) and a super-high Q microwave cavity. O2·- formation was determined by following the oxidation of CP-H to paramagnetic 3-carboxy-proxyl (CP·).17,18 The ESR instrumental settings were as follows: field sweep, 50 G; microwave frequency, 9.78 GHz; microwave power, 20 mW; modulation amplitude, 2 G; conversion time, 656 ms; time constant, 656 ms; 512 points resolution and receiver gain, 1x105 (74 dB). Time scans were recorded using 1312 ms conversion time, 5248 ms time constant, and monitoring the ESR amplitude of low-field component of ESR spectrum of carboxy-proxyl nitroxide for 300 s.

Immunoblot Analysis of p47phox and Angiotensin II Type 1-Receptor Expression in Endothelial Cells
Protein samples were prepared from mouse aortic endothelial cells and lysed directly in SDS sample buffer. Protein from endothelial cell lysates (20 µg) was separated by SDS-PAGE, transferred to membranes, and probed with anti-p47phox antibody (BD Transduction Laboratories) or angiotensin II type 1 (AT1)-receptor antibody (Santa Cruz Biotechnology). For the p47phox immunoblot analysis, mouse macrophage lysates (10 µg) were loaded as positive controls. Protein was visualized by chemiluminescence.

Data Analysis
All data are expressed as mean±SEM. Comparisons between groups of animals or treatments were made by one-way ANOVA, followed by Student-Newman-Keuls test. Values of P<0.05 were considered statistically significant.


*    Results
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Effects of Angiotensin II Treatment on Vascular Superoxide Production in Wild-Type (C57/BL6) and p47phox-/- Mice
Angiotensin II infusion caused a 2- to 3-fold increase in vascular O2·- production in wild-type (C57/BL6) mice (Figure 1a). In contrast, in p47phox-/- mice, no increase in vascular O2·- formation was observed after treatment with angiotensin II (Figure 1a). To estimate O2·- production in mouse aortas in situ, we used HE staining. Conversion of HE by O2·- to ethidium results in nuclear fluorescence. Aortas from angiotensin II-treated wild-type mice consistently showed a markedly increased fluorescence, both in the endothelium and in vascular smooth muscle, indicating increased O2·- production (Figure 1b). In p47phox-/- mice, however, no increase in HE-detectable O2·- production was observed after angiotensin II infusion (Figure 1b).



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Figure 1. Effect of angiotensin II (Ang II) infusion on vascular superoxide production in mouse aortas from wild-type (C57/BL6) and p47phox-/- mice. a, Superoxide production in sham and Ang II-treated mice as determined with lucigenin-enhanced chemiluminescence (5 µmol/L; n=5 to 9). b, In situ detection of superoxide production with dihydroethidium (HE) in sham and Ang II-treated mice. Data are representative of 3 separate experiments.

Effect of Angiotensin II Treatment on Blood Pressure in Wild-Type and p47phox-/- Mice
In wild-type mice, angiotensin II infusion caused an increase in blood pressure from 105±2 to 151±6 mm Hg (Figure 2). Importantly, in p47phox-/- mice, the blood pressure response to angiotensin II was markedly blunted (Figure 2).



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Figure 2. Effect of Ang II infusion on systolic blood pressure in wild-type (C57/BL6) and p47phox-/- mice (n=5 to 9). *P<0.05 (ang II-infused wild-type vs ang II-infused p47phox-/- mice).

Effect of Angiotensin II on Superoxide Production in Cultured Endothelial Cells from Wild-Type and p47phox-/- Mice
To study the role of p47phox in angiotensin II-induced O2·- formation in endothelial cells independent of changes in blood pressure we measured O2·- formation in cultured endothelial cells from wild-type and p47phox-/- mice. Whereas in wild-type endothelial cells, angiotensin II administration (10-6 mol/L) caused a substantial increase in CP-H oxidation, there was no change in CP-H oxidation in p47phox-deficient endothelial cells in response to angiotensin II (Figures 3a and 3b). The increase of CP-H oxidation caused by angiotensin II in wild-type endothelial cells was completely inhibited by superoxide dismutase (50 U PEG-SOD), indicating that CP-H oxidation was caused by O2·- (Figure 3a).



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Figure 3. Determination of superoxide formation in cultured aortic endothelial cells from wild-type and p47phox-/- mice using ESR spectroscopy. a, Increase of CP-H oxidation by endothelial cells in response to Ang II; effect of superoxide dismutase (50 U PEG-SOD). b, Representative "time scan" of CP-H oxidation in wild-type and p47phox-deficient endothelial cells stimulated with Ang II. c, Western blot analysis of p47phox expression in endothelial cells from wild-type (WT) and p47phox-/- mice. Protein extracted from mouse macrophage lysates was used as a positive control. d, Western blot analysis of AT1-receptor expression in endothelial cells from WT and p47phox-/- mice. Data are representative of 3 separate experiments.

Immunoblot Analysis of p47phox and AT1-Receptor Expression in Endothelial Cells
The p47phox subunit of the NAD(P)H oxidase was expressed in aortic endothelial cells from wild-type mice but not in endothelial cells cultured from p47phox-deficient mice (Figure 3c). The expression of the AT1 receptor was similar in p47phox-deficient and wild-type endothelial cells (Figure 3d).


*    Discussion
up arrowTop
up arrowAbstract
up arrowIntroduction
up arrowMethods
up arrowResults
*Discussion
down arrowReferences
 
Our present results demonstrate a critical role of the NAD(P)H oxidase and its subunit p47phox for the vascular oxidant stress response to angiotensin II. The increase in vascular O2·- production in response to angiotensin II administration was diminished in p47phox-/- mice and the amount of hypertension caused by angiotensin II was reduced in these animals compared with wild-type mice. Angiotensin II stimulated O2·- production in cultured aortic endothelial cells from wild-type mice but not in p47phox-deficient endothelial cells.

We have previously shown that angiotensin II administration in rats causes a substantial increase in vascular O2·- formation and impairs endothelium-dependent vasodilation.4 Treatment with liposome-encapsulated superoxide dismutase (SOD) or the membrane-permeable SOD mimetic tempol blunts the increase in blood pressure caused by angiotensin II and preserves the bioavailability of nitric oxide, suggesting that the increase in vascular O2·- formation is critical for the blood response to the octapeptide.5,6 An important source of O2·- in endothelial and vascular smooth muscle cells is the NAD(P)H oxidase, 3,19 which is stimulated by angiotensin II in both cell types.3,79 In addition, increased vascular NAD(P)H oxidase activity and increased expression of its subunit p22phox was observed in angiotensin II-treated rats in vivo,4,20 raising the question whether activation of this enzyme complex is critical for the oxidant stress and blood pressure response to angiotensin II. In the present studies, we used mice deficient in p47phox,10 a cytosolic subunit of the NAD(P)H oxidase, to address this question. Whereas angiotensin II administration caused a 2- to 3-fold increase of vascular O2·- production in wild-type mice, no such increase was observed in p47phox-deficient mice after angiotensin II treatment. Importantly, the blood pressure response to angiotensin II was markedly blunted in mice lacking p47phox compared with wild-type mice, suggesting a pivotal role of NAD(P)H oxidase activation for the blood pressure increase caused by angiotensin II.

In addition to smooth muscle cells, a major source of vascular O2·- stimulated by angiotensin II in vivo appears to be the endothelium. In wild-type, but not in p47phox-deficient mice, there was a marked increase of endothelial O2·- production evoked by angiotensin II as detected by HE fluorescent staining. Lavigne et al have recently demonstrated the requirement of p47phox for angiotensin II-stimulated O2·- production in vascular smooth muscle cells in vitro.8 In the present study, we therefore analyzed the role of p47phox in angiotensin II-induced oxidant stress in endothelial cells. In cultured endothelial cells from wild-type mice, but not in p47phox-deficient cells, there was a marked increase of O2·- formation after exposure to angiotensin II as revealed by ESR spectroscopy, suggesting that activation of the NAD(P)H oxidase within the endothelium is dependent on p47phox. One possible explanation for there being less O2·- formation in response to angiotensin II in p47phox-deficient endothelial cells could be a reduced AT1-receptor gene expression. Our Western blot analysis, however, showed similar expression of the AT1 receptor in p47phox-deficient and wild-type endothelial cells.

Basal O2·- production was similar in endothelial cells from wild-type and p47phox-deficient mice, suggesting that p47phox is not essential for basal O2·- formation in endothelial cells. There are other sources of O2·- (ie, xanthine oxidase, cytochrome p450, mitochondria), which could also account for basal O2·- formation in p47phox-deficient cells. Our results are compatible with the recent findings of Li et al21 in cultured coronary microvascular endothelial cells from p47phox-deficient mice, who found no reduction in basal O2·- production, but a reduced response to TNF-{alpha} and phorbol ester in p47phox-deficient microvascular endothelial cells.21

In the present study, we observed expression of p47phox in aortic endothelial cells from wild-type, but not from p47phox-deficient mice. The expression of the NAD(P)H oxidase subunit p47phox has been demonstrated in other endothelial cell lines, ie, human umbilical vein endothelial cells and murine microvascular endothelial cells.21,22 In neutrophils the importance of p47phox for activation of the NAD(P)H oxidase is well documented because its phosphorylation appears to be the limiting step required for assembly of the active enzyme complex.23 Furthermore, mutations of p47phox are a cause of chronic granulomatous disease, an immune deficiency resulting from impaired phagocyte activity.23 The results of the present studies suggest that p47phox is equally vital to the activation of the NAD(P)H oxidase by angiotensin II within the endothelium.

Perspectives
In summary, the present study indicates that the NAD(P)H oxidase and its cytosolic subunit p47phox play a pivotal role in mediating the hypertension caused by angiotensin II. Our results are in keeping with a recent study by Rey et al who demonstrated that treatment with a chimeric peptide designed to inhibit the association of p47phox with the NAD(P)H oxidase membrane components diminished the blood pressure response to angiotensin II.24 Our experiments also show that p47phox and the NAD(P)H oxidase are essential for angiotensin II-stimulated O2· production in cultured aortic endothelial cells. Increased endothelial O2·- production in response to angiotensin II may also be important for the proinflammatory and proatherogenic effects of the octapeptide. Stokes et al25 have recently demonstrated that p47phox deficiency diminished the hypercholesterolemia-induced leukocyte-endothelial cell adhesion, and we have previously shown that activation of the vascular NAD(P)H oxidase in hypercholesterolemia is dependent on angiotensin II.26 Furthermore, when crossed with p47phox-/- mice, apolipoprotein E (Apo[e])-deficient mice have a rather marked reduction in atherosclerosis in the descending aorta compared with mice lacking only Apo(e).27 Given these now very clear crucial roles in vascular disease, the NAD(P)H oxidase and p47phox represent important targets for therapeutic intervention, and their specific inhibitors would very likely be useful in treatment of common disorders such as hypertension and atherosclerosis.


*    Acknowledgments
 
We gratefully acknowledge excellent technical support by Graciela Gamez. This work was supported by National Institutes of Health (NIH) grants HL390006 (D.G.H.) and HL59248 (D.G.H.), NIH Program Project Grant HL58000 (D.G.H.), and a Department of Veterans Affairs merit grant (D.G.H.). U.L. was supported by a grant from the German Cardiac Society and the Feodor Lynen Grant of the Alexander von Humboldt Foundation.

Received April 29, 2002; first decision May 9, 2002; accepted July 15, 2002.


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up arrowAbstract
up arrowIntroduction
up arrowMethods
up arrowResults
up arrowDiscussion
*References
 
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16. Suh SH, Vennekens R, Manolopoulos VG, Freichel M, Schweig U, Prenen J, Flockerzi V, Droogmans G, Nilius B. Characterization of explanted endothelial cells from mouse aorta: electrophysiology and Ca2+ signaling. Pflugers Arch. 1999; 438: 612–620.[CrossRef][Medline] [Order article via Infotrieve]

17. Dikalov S, Skatchkov M, Bassenge E. Spin trapping of superoxide radicals and peroxynitrite by 1-hydroxy-3-carboxy-pyrrolidine and 1-hydroxy-2,2,6,6-tetramethyl-4-oxo-piperidine and the stability of corresponding nitroxyl radicals towards biological reductants. Biochem Biophys Res Commun. 1997; 231: 701–704.[CrossRef][Medline] [Order article via Infotrieve]

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20. Fukui T, Ishizaka N, Rajagopalan S, Laursen JB, Capers Qt, Taylor WR, Harrison DG, de Leon H, Wilcox JN, Griendling KK. p22phox mRNA expression and NAD(P)H oxidase activity are increased in aortas from hypertensive rats. Circ Res. 1997; 80: 45–51.[Abstract/Free Full Text]

21. Li JM, Mullen AM, Yun S, Wientjes F, Brouns GY, Thrasher AJ, Shah AM. Essential role of the NAD(P)H oxidase subunit p47(phox) in endothelial cell superoxide production in response to phorbol ester and tumor necrosis factor-alpha. Circ Res. 2002; 90: 143–150.[Abstract/Free Full Text]

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Nicotine Tob ResHome page
W. G. Mayhan, D. M. Arrick, G. M. Sharpe, and H. Sun
Nitric oxide synthase-dependent responses of the basilar artery during acute infusion of nicotine
Nicotine Tob Res, March 1, 2009; 11(3): 270 - 277.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Heart Circ. Physiol.Home page
A. A. Miller, G. R. Drummond, T. M. De Silva, A. E. Mast, H. Hickey, J. P. Williams, B. R. S. Broughton, and C. G. Sobey
NADPH oxidase activity is higher in cerebral versus systemic arteries of four animal species: role of Nox2
Am J Physiol Heart Circ Physiol, January 1, 2009; 296(1): H220 - H225.
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J. Pharmacol. Exp. Ther.Home page
P.-S. Tsou, V. Addanki, and H.-L. Fung
Dissociation between Superoxide Accumulation and Nitroglycerin-Induced Tolerance
J. Pharmacol. Exp. Ther., October 1, 2008; 327(1): 97 - 104.
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Am. J. Pathol.Home page
X. W. Cheng, T. Murohara, M. Kuzuya, H. Izawa, T. Sasaki, K. Obata, K. Nagata, T. Nishizawa, M. Kobayashi, T. Yamada, et al.
Superoxide-Dependent Cathepsin Activation Is Associated with Hypertensive Myocardial Remodeling and Represents a Target for Angiotensin II Type 1 Receptor Blocker Treatment
Am. J. Pathol., August 1, 2008; 173(2): 358 - 369.
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Am. J. Physiol. Renal Physiol.Home page
M. M. Diaz Encarnacion, G. M. Warner, C. E. Gray, J. Cheng, H. K. H. Keryakos, K. A. Nath, and J. P. Grande
Signaling pathways modulated by fish oil in salt-sensitive hypertension
Am J Physiol Renal Physiol, June 1, 2008; 294(6): F1323 - F1335.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
S. Jin, Y. Zhang, F. Yi, and P.-L. Li
Critical Role of Lipid Raft Redox Signaling Platforms in Endostatin-Induced Coronary Endothelial Dysfunction
Arterioscler Thromb Vasc Biol, March 1, 2008; 28(3): 485 - 490.
[Abstract] [Full Text] [PDF]


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Mol Cancer ResHome page
H. Uemura, H. Ishiguro, Y. Ishiguro, K. Hoshino, S. Takahashi, and Y. Kubota
Angiotensin II Induces Oxidative Stress in Prostate Cancer
Mol. Cancer Res., February 1, 2008; 6(2): 250 - 258.
[Abstract] [Full Text] [PDF]


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Diabetes CareHome page
T. M. Paravicini and R. M. Touyz
NADPH Oxidases, Reactive Oxygen Species, and Hypertension: Clinical implications and therapeutic possibilities
Diabetes Care, February 1, 2008; 31(Supplement_2): S170 - S180.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
H. Choi, T. L. Leto, L. Hunyady, K. J. Catt, Y. S. Bae, and S. G. Rhee
Mechanism of Angiotensin II-induced Superoxide Production in Cells Reconstituted with Angiotensin Type 1 Receptor and the Components of NADPH Oxidase
J. Biol. Chem., January 4, 2008; 283(1): 255 - 267.
[Abstract] [Full Text] [PDF]


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Circ. Res.Home page
T. Adachi, M. Yamamoto, and M. Suematsu
Targeting NAD(P)H Oxidase: Ets-1 Regulates p47phox
Circ. Res., November 9, 2007; 101(10): 962 - 964.
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Circ. Res.Home page
W. Ni, Y. Zhan, H. He, E. Maynard, J. A. Balschi, and P. Oettgen
Ets-1 Is a Critical Transcriptional Regulator of Reactive Oxygen Species and p47phox Gene Expression in Response to Angiotensin II
Circ. Res., November 9, 2007; 101(10): 985 - 994.
[Abstract] [Full Text] [PDF]


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Cardiovasc ResHome page
G.-X. Zhang, X.-M. Lu, S. Kimura, and A. Nishiyama
Role of mitochondria in angiotensin II-induced reactive oxygen species and mitogen-activated protein kinase activation
Cardiovasc Res, November 1, 2007; 76(2): 204 - 212.
[Abstract] [Full Text] [PDF]


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JEMHome page
T. J. Guzik, N. E. Hoch, K. A. Brown, L. A. McCann, A. Rahman, S. Dikalov, J. Goronzy, C. Weyand, and D. G. Harrison
Role of the T cell in the genesis of angiotensin II induced hypertension and vascular dysfunction
J. Exp. Med., October 1, 2007; 204(10): 2449 - 2460.
[Abstract] [Full Text] [PDF]


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CirculationHome page
S. A. Sorrentino, F. H. Bahlmann, C. Besler, M. Muller, S. Schulz, N. Kirchhoff, C. Doerries, T. Horvath, A. Limbourg, F. Limbourg, et al.
Oxidant Stress Impairs In Vivo Reendothelialization Capacity of Endothelial Progenitor Cells From Patients With Type 2 Diabetes Mellitus: Restoration by the Peroxisome Proliferator-Activated Receptor-{gamma} Agonist Rosiglitazone
Circulation, July 10, 2007; 116(2): 163 - 173.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Renal Physiol.Home page
R. Liu, J. L. Garvin, Y. Ren, P. J. Pagano, and O. A. Carretero
Depolarization of the macula densa induces superoxide production via NAD(P)H oxidase
Am J Physiol Renal Physiol, June 1, 2007; 292(6): F1867 - F1872.
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Circ. Res.Home page
J. K. Bendall, R. Rinze, D. Adlam, A. L. Tatham, J. de Bono, and K. M. Channon
Endothelial Nox2 Overexpression Potentiates Vascular Oxidative Stress and Hemodynamic Response to Angiotensin II: Studies in Endothelial-Targeted Nox2 Transgenic Mice
Circ. Res., April 13, 2007; 100(7): 1016 - 1025.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
U. Landmesser, S. Spiekermann, C. Preuss, S. Sorrentino, D. Fischer, C. Manes, M. Mueller, and H. Drexler
Angiotensin II Induces Endothelial Xanthine Oxidase Activation: Role for Endothelial Dysfunction in Patients With Coronary Disease
Arterioscler Thromb Vasc Biol, April 1, 2007; 27(4): 943 - 948.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
J. D. Widder, T. J. Guzik, C. F.H. Mueller, R. E. Clempus, H. H.H.W. Schmidt, S. I. Dikalov, K. K. Griendling, D. P. Jones, and D. G. Harrison
Role of the Multidrug Resistance Protein-1 in Hypertension and Vascular Dysfunction Caused by Angiotensin II
Arterioscler Thromb Vasc Biol, April 1, 2007; 27(4): 762 - 768.
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Circ. Res.Home page
C. Doerries, K. Grote, D. Hilfiker-Kleiner, M. Luchtefeld, A. Schaefer, S. M. Holland, S. Sorrentino, C. Manes, B. Schieffer, H. Drexler, et al.
Critical Role of the NAD(P)H Oxidase Subunit p47phox for Left Ventricular Remodeling/Dysfunction and Survival After Myocardial Infarction
Circ. Res., March 30, 2007; 100(6): 894 - 903.
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Am. J. Pathol.Home page
P. Patwari and R. T. Lee
Thioredoxins, Mitochondria, and Hypertension
Am. J. Pathol., March 1, 2007; 170(3): 805 - 808.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
I. Armando, X. Wang, V. A. M. Villar, J. E. Jones, L. D. Asico, C. Escano, and P. A. Jose
Reactive Oxygen Species-Dependent Hypertension in Dopamine D2 Receptor-Deficient Mice
Hypertension, March 1, 2007; 49(3): 672 - 678.
[Abstract] [Full Text] [PDF]


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Exp. Biol. Med.Home page
T. Szasz, K. Thakali, G. D. Fink, and S. W. Watts
A Comparison of Arteries and Veins in Oxidative Stress: Producers, Destroyers, Function, and Disease
Experimental Biology and Medicine, January 1, 2007; 232(1): 27 - 37.
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Physiol. Rev.Home page
K. Bedard and K.-H. Krause
The NOX Family of ROS-Generating NADPH Oxidases: Physiology and Pathophysiology
Physiol Rev, January 1, 2007; 87(1): 245 - 313.
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Am. J. Physiol. Heart Circ. Physiol.Home page
G. Zhang, F. Zhang, R. Muh, F. Yi, K. Chalupsky, H. Cai, and P.-L. Li
Autocrine/paracrine pattern of superoxide production through NAD(P)H oxidase in coronary arterial myocytes
Am J Physiol Heart Circ Physiol, January 1, 2007; 292(1): H483 - H495.
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Am. J. Physiol. Heart Circ. Physiol.Home page
Y. Wang, A. F. Chen, and D. H. Wang
Enhanced oxidative stress in kidneys of salt-sensitive hypertension: role of sensory nerves
Am J Physiol Heart Circ Physiol, December 1, 2006; 291(6): H3136 - H3143.
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J. Biol. Chem.Home page
Y. Wei, J. R. Sowers, R. Nistala, H. Gong, G. M.-E. Uptergrove, S. E. Clark, E. M. Morris, N. Szary, C. Manrique, and C. S. Stump
Angiotensin II-induced NADPH Oxidase Activation Impairs Insulin Signaling in Skeletal Muscle Cells
J. Biol. Chem., November 17, 2006; 281(46): 35137 - 35146.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Heart Circ. Physiol.Home page
M. Feletou and P. M. Vanhoutte
Endothelial dysfunction: a multifaceted disorder (The Wiggers Award Lecture)
Am J Physiol Heart Circ Physiol, September 1, 2006; 291(3): H985 - H1002.
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Cardiovasc ResHome page
M. Sarr, M. Chataigneau, S. Martins, C. Schott, J. El Bedoui, M.-H. Oak, B. Muller, T. Chataigneau, and V. B. Schini-Kerth
Red wine polyphenols prevent angiotensin II-induced hypertension and endothelial dysfunction in rats: Role of NADPH oxidase
Cardiovasc Res, September 1, 2006; 71(4): 794 - 802.
[Abstract] [Full Text] [PDF]


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Cardiovasc ResHome page
K. Grote, M. Ortmann, G. Salguero, C. Doerries, U. Landmesser, M. Luchtefeld, R. P. Brandes, W. Gwinner, T. Tschernig, E.-G. Brabant, et al.
Critical role for p47phox in renin-angiotensin system activation and blood pressure regulation
Cardiovasc Res, August 1, 2006; 71(3): 596 - 605.
[Abstract] [Full Text] [PDF]


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CirculationHome page
M. Thomas, D. Gavrila, M. L. McCormick, F. J. Miller Jr, A. Daugherty, L. A. Cassis, K. C. Dellsperger, and N. L. Weintraub
Deletion of p47phox Attenuates Angiotensin II-Induced Abdominal Aortic Aneurysm Formation in Apolipoprotein E-Deficient Mice
Circulation, August 1, 2006; 114(5): 404 - 413.
[Abstract] [Full Text] [PDF]


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Cardiovasc ResHome page
T. M. Paravicini and R. M. Touyz
Redox signaling in hypertension
Cardiovasc Res, July 15, 2006; 71(2): 247 - 258.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
D. Nagata, M. Takahashi, K. Sawai, T. Tagami, T. Usui, A. Shimatsu, Y. Hirata, and M. Naruse
Molecular Mechanism of the Inhibitory Effect of Aldosterone on Endothelial NO Synthase Activity
Hypertension, July 1, 2006; 48(1): 165 - 171.
[Abstract] [Full Text] [PDF]


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CirculationHome page
S. Miriyala, M. C. Gongora Nieto, C. Mingone, D. Smith, S. Dikalov, D. G. Harrison, and H. Jo
Bone Morphogenic Protein-4 Induces Hypertension in Mice: Role of Noggin, Vascular NADPH Oxidases, and Impaired Vasorelaxation
Circulation, June 20, 2006; 113(24): 2818 - 2825.
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Mol. Endocrinol.Home page
L. Hunyady and K. J. Catt
Pleiotropic AT1 Receptor Signaling Pathways Mediating Physiological and Pathogenic Actions of Angiotensin II
Mol. Endocrinol., May 1, 2006; 20(5): 953 - 970.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
M. Menshikov, O. Plekhanova, H. Cai, K. Chalupsky, Y. Parfyonova, P. Bashtrikov, V. Tkachuk, and B. C. Berk
Urokinase Plasminogen Activator Stimulates Vascular Smooth Muscle Cell Proliferation Via Redox-Dependent Pathways
Arterioscler Thromb Vasc Biol, April 1, 2006; 26(4): 801 - 807.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
N. E. Taylor, P. Glocka, M. Liang, and A. W. Cowley Jr
NADPH Oxidase in the Renal Medulla Causes Oxidative Stress and Contributes to Salt-Sensitive Hypertension in Dahl S Rats
Hypertension, April 1, 2006; 47(4): 692 - 698.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
P. Modlinger, T. Chabrashvili, P. S. Gill, M. Mendonca, D. G. Harrison, K. K. Griendling, M. Li, J. Raggio, A. Wellstein, Y. Chen, et al.
RNA Silencing In Vivo Reveals Role of p22phox in Rat Angiotensin Slow Pressor Response
Hypertension, February 1, 2006; 47(2): 238 - 244.
[Abstract] [Full Text] [PDF]


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Am. J. Pathol.Home page
M. Wang, J. Zhang, G. Spinetti, L.-Q. Jiang, R. Monticone, D. Zhao, L. Cheng, M. Krawczyk, M. Talan, G. Pintus, et al.
Angiotensin II Activates Matrix Metalloproteinase Type II and Mimics Age-Associated Carotid Arterial Remodeling in Young Rats
Am. J. Pathol., November 1, 2005; 167(5): 1429 - 1442.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
S. P. Didion, D. A. Kinzenbaw, and F. M. Faraci
Critical Role for CuZn-Superoxide Dismutase in Preventing Angiotensin II-Induced Endothelial Dysfunction
Hypertension, November 1, 2005; 46(5): 1147 - 1153.
[Abstract] [Full Text] [PDF]


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CirculationHome page
K. Matsuno, H. Yamada, K. Iwata, D. Jin, M. Katsuyama, M. Matsuki, S. Takai, K. Yamanishi, M. Miyazaki, H. Matsubara, et al.
Nox1 Is Involved in Angiotensin II-Mediated Hypertension: A Study in Nox1-Deficient Mice
Circulation, October 25, 2005; 112(17): 2677 - 2685.
[Abstract] [Full Text] [PDF]


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CirculationHome page
A. Dikalova, R. Clempus, B. Lassegue, G. Cheng, J. McCoy, S. Dikalov, A. S. Martin, A. Lyle, D. S. Weber, D. Weiss, et al.
Nox1 Overexpression Potentiates Angiotensin II-Induced Hypertension and Vascular Smooth Muscle Hypertrophy in Transgenic Mice
Circulation, October 25, 2005; 112(17): 2668 - 2676.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
C. S. Wilcox
Oxidative stress and nitric oxide deficiency in the kidney: a critical link to hypertension?
Am J Physiol Regulatory Integrative Comp Physiol, October 1, 2005; 289(4): R913 - R935.
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Circ. Res.Home page
Y. Castier, R. P. Brandes, G. Leseche, A. Tedgui, and S. Lehoux
p47phox-Dependent NADPH Oxidase Regulates Flow-Induced Vascular Remodeling
Circ. Res., September 16, 2005; 97(6): 533 - 540.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
J. L. Park, R. D. Loberg, D. Duquaine, H. Zhang, B. K. Deo, N. Ardanaz, J. Coyle, K. B. Atkins, M. Schin, M. J. Charron, et al.
GLUT4 Facilitative Glucose Transporter Specifically and Differentially Contributes to Agonist-Induced Vascular Reactivity in Mouse Aorta
Arterioscler Thromb Vasc Biol, August 1, 2005; 25(8): 1596 - 1602.
[Abstract] [Full Text] [PDF]


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J. Am. Soc. Nephrol.Home page
M. E. Ullian, A. K. Gelasco, W. R. Fitzgibbon, C. N. Beck, and T. A. Morinelli
N-Acetylcysteine Decreases Angiotensin II Receptor Binding in Vascular Smooth Muscle Cells
J. Am. Soc. Nephrol., August 1, 2005; 16(8): 2346 - 2353.
[Abstract] [Full Text] [PDF]


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CirculationHome page
R. Matsui, S. Xu, K. A. Maitland, A. Hayes, J. A. Leopold, D. E. Handy, J. Loscalzo, and R. A. Cohen
Glucose-6 Phosphate Dehydrogenase Deficiency Decreases the Vascular Response to Angiotensin II
Circulation, July 12, 2005; 112(2): 257 - 263.
[Abstract] [Full Text] [PDF]


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Proc. Natl. Acad. Sci. USAHome page
K. Chalupsky and H. Cai
Endothelial dihydrofolate reductase: Critical for nitric oxide bioavailability and role in angiotensin II uncoupling of endothelial nitric oxide synthase
PNAS, June 21, 2005; 102(25): 9056 - 9061.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Renal Physiol.Home page
S. Wesseling, D. A. Ishola Jr., J. A. Joles, H. A. Bluyssen, H. A. Koomans, and B. Braam
Resistance to oxidative stress by chronic infusion of angiotensin II in mouse kidney is not mediated by the AT2 receptor
Am J Physiol Renal Physiol, June 1, 2005; 288(6): F1191 - F1200.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
M. Akishita, K. Nagai, H. Xi, W. Yu, N. Sudoh, T. Watanabe, M. Ohara-Imaizumi, S. Nagamatsu, K. Kozaki, M. Horiuchi, et al.
Renin-Angiotensin System Modulates Oxidative Stress-Induced Endothelial Cell Apoptosis in Rats
Hypertension, June 1, 2005; 45(6): 1188 - 1193.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
N. R. Madamanchi, S.-K. Moon, Z. S. Hakim, S. Clark, A. Mehrizi, C. Patterson, and M. S. Runge
Differential Activation of Mitogenic Signaling Pathways in Aortic Smooth Muscle Cells Deficient in Superoxide Dismutase Isoforms
Arterioscler Thromb Vasc Biol, May 1, 2005; 25(5): 950 - 956.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
S. Kimura, G.-X. Zhang, A. Nishiyama, T. Shokoji, L. Yao, Y.-Y. Fan, M. Rahman, T. Suzuki, H. Maeta, and Y. Abe
Role of NAD(P)H Oxidase- and Mitochondria-Derived Reactive Oxygen Species in Cardioprotection of Ischemic Reperfusion Injury by Angiotensin II
Hypertension, May 1, 2005; 45(5): 860 - 866.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
U. Laufs, S. Wassmann, T. Czech, T. Munzel, M. Eisenhauer, M. Bohm, and G. Nickenig
Physical Inactivity Increases Oxidative Stress, Endothelial Dysfunction, and Atherosclerosis
Arterioscler Thromb Vasc Biol, April 1, 2005; 25(4): 809 - 814.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
D. M. Pollock
Endothelin, Angiotensin, and Oxidative Stress in Hypertension
Hypertension, April 1, 2005; 45(4): 477 - 480.
[Full Text] [PDF]


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HypertensionHome page
R. M. Touyz, C. Mercure, Y. He, D. Javeshghani, G. Yao, G. E. Callera, A. Yogi, N. Lochard, and T. L. Reudelhuber
Angiotensin II-Dependent Chronic Hypertension and Cardiac Hypertrophy Are Unaffected by gp91phox-Containing NADPH Oxidase
Hypertension, April 1, 2005; 45(4): 530 - 537.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
S. Kimura, G.-X. Zhang, A. Nishiyama, T. Shokoji, L. Yao, Y.-Y. Fan, M. Rahman, and Y. Abe
Mitochondria-Derived Reactive Oxygen Species and Vascular MAP Kinases: Comparison of Angiotensin II and Diazoxide
Hypertension, March 1, 2005; 45(3): 438 - 444.
[Abstract] [Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
K. K. Griendling
ATVB In Focus: Redox Mechanisms in Blood Vessels
Arterioscler Thromb Vasc Biol, February 1, 2005; 25(2): 272 - 273.
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Am. J. Physiol. Heart Circ. Physiol.Home page
C. S. Wilcox and D. Gutterman
Focus on oxidative stress in the cardiovascular and renal systems
Am J Physiol Heart Circ Physiol, January 1, 2005; 288(1): H3 - H6.
[Full Text] [PDF]


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Arterioscler. Thromb. Vasc. Bio.Home page
N. R. Madamanchi, A. Vendrov, and M. S. Runge
Oxidative Stress and Vascular Disease
Arterioscler Thromb Vasc Biol, January 1, 2005; 25(1): 29 - 38.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
J.-M. Li and A. M Shah
Endothelial cell superoxide generation: regulation and relevance for cardiovascular pathophysiology
Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2004; 287(5): R1014 - R1030.
[Abstract] [Full Text] [PDF]


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CirculationHome page
N. Engberding, S. Spiekermann, A. Schaefer, A. Heineke, A. Wiencke, M. Muller, M. Fuchs, D. Hilfiker-Kleiner, B. Hornig, H. Drexler, et al.
Allopurinol Attenuates Left Ventricular Remodeling and Dysfunction After Experimental Myocardial Infarction: A New Action for an Old Drug?
Circulation, October 12, 2004; 110(15): 2175 - 2179.
[Abstract] [Full Text] [PDF]


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Physiol. Rev.Home page
R. Stocker and J. F. Keaney Jr.
Role of Oxidative Modifications in Atherosclerosis
Physiol Rev, October 1, 2004; 84(4): 1381 - 1478.
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Am. J. Physiol. Heart Circ. Physiol.Home page
L. Jin, Z. Ying, and R. C. Webb
Activation of Rho/Rho kinase signaling pathway by reactive oxygen species in rat aorta
Am J Physiol Heart Circ Physiol, October 1, 2004; 287(4): H1495 - H1500.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Cell Physiol.Home page
B. Fink, K. Laude, L. McCann, A. Doughan, D. G. Harrison, and S. Dikalov
Detection of intracellular superoxide formation in endothelial cells and intact tissues using dihydroethidium and an HPLC-based assay
Am J Physiol Cell Physiol, October 1, 2004; 287(4): C895 - C902.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
S. Wassmann, K. Wassmann, and G. Nickenig
Modulation of Oxidant and Antioxidant Enzyme Expression and Function in Vascular Cells
Hypertension, October 1, 2004; 44(4): 381 - 386.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Heart Circ. Physiol.Home page
Y. Chen, A.-P. Arrigo, and R. W. Currie
Heat shock treatment suppresses angiotensin II-induced activation of NF-{kappa}B pathway and heart inflammation: a role for IKK depletion by heat shock?
Am J Physiol Heart Circ Physiol, September 1, 2004; 287(3): H1104 - H1114.
[Abstract] [Full Text] [PDF]


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HypertensionHome page
R. M. Touyz
Reactive Oxygen Species, Vascular Oxidative Stress, and Redox Signaling in Hypertension: What Is the Clinical Significance?
Hypertension, September 1, 2004; 44(3): 248 - 252.
[Abstract] [Full Text] [PDF]


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Circ. Res.Home page
R. P. Brandes
And What About the Endothelium?: On the Predominance of Cerebral Superoxide Formation for Angiotensin II-Induced Systemic Hypertension
Circ. Res., July 23, 2004; 95(2): 122 - 124.
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Circ. Res.Home page
M. C. Zimmerman, E. Lazartigues, R. V. Sharma, and R. L. Davisson
Hypertension Caused by Angiotensin II Infusion Involves Increased Superoxide Production in the Central Nervous System
Circ. Res., July 23, 2004; 95(2): 210 - 216.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
T. Adachi, D. R. Pimentel, T. Heibeck, X. Hou, Y. J. Lee, B. Jiang, Y. Ido, and R. A. Cohen
S-Glutathiolation of Ras Mediates Redox-sensitive Signaling by Angiotensin II in Vascular Smooth Muscle Cells
J. Biol. Chem., July 9, 2004; 279(28): 29857 - 29862.
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Am. J. Pathol.Home page
Z. Ungvari, A. Csiszar, P. M. Kaminski, M. S. Wolin, and A. Koller
Chronic High Pressure-Induced Arterial Oxidative Stress: Involvement of Protein Kinase C-Dependent NAD(P)H Oxidase and Local Renin-Angiotensin System
Am. J. Pathol., July 1, 2004; 165(1): 219 - 226.
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Am. J. Physiol. Lung Cell. Mol. Physiol.Home page
J. Q. Liu and R. J. Folz
Extracellular superoxide enhances 5-HT-induced murine pulmonary artery vasoconstriction
Am J Physiol Lung Cell Mol Physiol, July 1, 2004; 287(1): L111 - L118.
[Abstract] [Full Text] [PDF]


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HeartHome page
K K Griendling
Novel NAD(P)H oxidases in the cardiovascular system
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M. J. Ryan, S. P. Didion, S. Mathur, F. M. Faraci, and C. D. Sigmund
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J.-M. Li, S. Wheatcroft, L. M. Fan, M. T. Kearney, and A. M. Shah
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Y. Taniyama and K. K. Griendling
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L-Arginine Reverses p47phox and gp91phox Expression Induced by High Salt in Dahl Rats
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M. Tepel
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Journal of Renin-Angiotensin-Aldosterone SystemHome page
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The Pickering Lecture British Hypertension Society, 10th September 2002: Interactions of angiotensin II with NAD(P)H oxidase, oxidant stress and cardiovascular disease
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HeartHome page
M. J Brown
A RATIONAL BASIS FOR SELECTION AMONG DRUGS OF THE SAME CLASS
Heart, June 1, 2003; 89(6): 687 - 694.
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