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Cardiovascular protection effect of a Northeastern Brazilian lyophilized red wine in spontaneously hypertensive rats. J Funct Foods 2022. [DOI: 10.1016/j.jff.2021.104868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Kirkby NS, Tesfai A, Ahmetaj-Shala B, Gashaw HH, Sampaio W, Etelvino G, Leão NM, Santos RA, Mitchell JA. Ibuprofen arginate retains eNOS substrate activity and reverses endothelial dysfunction: implications for the COX-2/ADMA axis. FASEB J 2016; 30:4172-4179. [PMID: 27601438 PMCID: PMC5102117 DOI: 10.1096/fj.201600647r] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 08/22/2016] [Indexed: 01/10/2023]
Abstract
Nonsteroidal antiinflammatory drugs, including ibuprofen, are among the most commonly used medications and produce their antiinflammatory effects by blocking cyclooxygenase (COX)-2. Their use is associated with increased risk of heart attacks caused by blocking COX-2 in the vasculature and/or kidney, with our recent work implicating the endogenous NOS inhibitor asymmetric dimethylarginine (ADMA), a cardiotoxic hormone whose effects can be prevented by l-arginine. The ibuprofen salt ibuprofen arginate (Spididol) was created to increase solubility but we suggest that it could also augment the NO pathway through codelivery of arginine. Here we investigated the idea that ibuprofen arginate can act to simultaneously inhibit COX-2 and preserve the NO pathway. Ibuprofen arginate functioned similarly to ibuprofen sodium for inhibition of mouse/human COX-2, but only ibuprofen arginate served as a substrate for NOS. Ibuprofen arginate but not ibuprofen sodium also reversed the inhibitory effects of ADMA and NG-nitro-l-arginine methyl ester on inducible NOS (macrophages) and endothelial NOS in vitro (aorta) and in vivo (blood pressure). These observations show that ibuprofen arginate provides, in one preparation, a COX-2 inhibitor and NOS substrate that could act to negate the harmful cardiovascular consequences mediated by blocking renal COX-2 and increased ADMA. While remarkably simple, our findings are potentially game-changing in the nonsteroidal antiinflammatory drug arena.-Kirkby, N. S., Tesfai, A., Ahmetaj-Shala, B., Gashaw, H. H., Sampaio, W., Etelvino, G., Leão, N. M., Santos, R. A., Mitchell, J. A. Ibuprofen arginate retains eNOS substrate activity and reverses endothelial dysfunction: implications for the COX-2/ADMA axis.
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Affiliation(s)
- Nicholas S Kirkby
- Vascular Biology Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; and
| | - Abel Tesfai
- Vascular Biology Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; and
| | - Blerina Ahmetaj-Shala
- Vascular Biology Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; and
| | - Hime H Gashaw
- Vascular Biology Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; and
| | - Walkyria Sampaio
- Department of Physiology and Biophysics, National Institute in Science and Technology in Nanobiopharmaceutics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Gisele Etelvino
- Department of Physiology and Biophysics, National Institute in Science and Technology in Nanobiopharmaceutics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Nádia Miricéia Leão
- Department of Physiology and Biophysics, National Institute in Science and Technology in Nanobiopharmaceutics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Robson A Santos
- Department of Physiology and Biophysics, National Institute in Science and Technology in Nanobiopharmaceutics, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Jane A Mitchell
- Vascular Biology Section, National Heart and Lung Institute, Imperial College London, London, United Kingdom; and
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Brunt VE, Fujii N, Minson CT. Endothelial-derived hyperpolarization contributes to acetylcholine-mediated vasodilation in human skin in a dose-dependent manner. J Appl Physiol (1985) 2015; 119:1015-22. [PMID: 26384409 DOI: 10.1152/japplphysiol.00201.2015] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 09/16/2015] [Indexed: 11/22/2022] Open
Abstract
Cutaneous acetylcholine (ACh)-mediated dilation is commonly used to assess microvascular function, but the mechanisms of dilation are poorly understood. Depending on dose and method of administration, nitric oxide (NO) and prostanoids are involved to varying extents and the roles of endothelial-derived hyperpolarizing factors (EDHFs) are unclear. In the present study, five incremental doses of ACh (0.01-100 mM) were delivered either as a 1-min bolus (protocol 1, n = 12) or as a ≥20-min continuous infusion (protocol 2, n = 10) via microdialysis fibers infused with 1) lactated Ringer, 2) tetraethylammonium (TEA) [a calcium-activated potassium channel (KCa) and EDHF inhibitor], 3) L-NNA+ketorolac [NO synthase (NOS) and cyclooxygenase (COX) inhibitors], and 4) TEA+L-NNA+Ketorolac. The hyperemic response was characterized as peak and area under the curve (AUC) cutaneous vascular conductance (CVC) for bolus infusions or plateau CVC for continuous infusions, and reported as %maximal CVC. In protocol 1, TEA, alone and combined with NOS+COX inhibition, attenuated peak CVC (100 mM Ringer 59 ± 6% vs. TEA 43 ± 5%, P < 0.05; L-NNA+ketorolac 35 ± 4% vs. TEA+L-NNA+ketorolac 25 ± 4%, P < 0.05) and AUC (Ringer 25,414 ± 3,528 vs. TEA 21,403 ± 3,416%·s, P < 0.05; L-NNA+ketorolac 25,628 ± 3,828%(.)s vs. TEA+L-NNA+ketorolac 20,772 ± 3,711%·s, P < 0.05), although these effects were only significant at the highest dose of ACh. At lower doses, TEA lengthened the total time of the hyperemic response (10 mM Ringer 609 ± 78 s vs. TEA 860 ± 67 s, P < 0.05). In protocol 2, TEA alone did not affect plateau CVC, but attenuated plateau in combination with NOS+COX inhibition (100 mM 50.4 ± 6.6% vs. 30.9 ± 6.3%, P < 0.05). Therefore, EDHFs contribute to cutaneous ACh-mediated dilation, but their relative contribution is altered by the dose and infusion procedure.
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Affiliation(s)
- Vienna E Brunt
- Department of Human Physiology, University of Oregon, Eugene, Oregon; and
| | - Naoto Fujii
- Department of Human Physiology, University of Oregon, Eugene, Oregon; and Human and Environmental Physiology Research Unit, University of Ottawa, Ottawa, Ontario, Canada
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Chennupati R, Lamers WH, Koehler SE, De Mey JGR. Endothelium-dependent hyperpolarization-related relaxations diminish with age in murine saphenous arteries of both sexes. Br J Pharmacol 2014; 169:1486-99. [PMID: 23488619 DOI: 10.1111/bph.12175] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 02/08/2013] [Accepted: 02/17/2013] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND AND PURPOSE We investigated the effects of aging on the contributions of NO and endothelium-dependent hyperpolarization (EDH) to endothelium-dependent relaxation in saphenous arteries of male and female C57BL/6J mice aged 12, 34 and 64 weeks. EXPERIMENTAL APPROACH Vasomotor responses of saphenous arteries were analysed by wire myography in the absence and presence of stimuli of the endothelium, inhibitors of NOS, and inhibitors and stimulants of small (KCa 2.3) and intermediate (KCa 3.1) conductance calcium-activated potassium channels. KEY RESULTS Arterial relaxing responses to sodium nitroprusside and to ACh in the absence of pharmacological inhibitors (indomethacin and L-NAME), were similar in all age groups and sexes, but those mediated by endothelium-derived NO were slightly but significantly increased in 64-week-old male mice. In the presence of inhibitors, 12-week-old animals showed pronounced ACh-induced relaxation, which was significantly reduced in 34- and 64-week-old mice of both sexes. The EDH-related component of ACh-induced relaxations was abolished by TRAM-34 (KCa 3.1 blocker) or UCL 1684 (KCa 2.3 blocker). Although the maximal relaxation induced by NS309 (KCa activator) was not affected by aging, the sensitivity for NS309 significantly decreased with aging. The presence of SKA-31 (KCa modulator) potentiated relaxations induced by ACh in arteries of 12-week-old but not older mice. CONCLUSION AND IMPLICATIONS In a small muscular artery of mice of either sex, total endothelium-dependent relaxation is not affected by age. However, possibly due to changes in KCa channel function, the contribution of EDH to endothelium-dependent relaxations decreased with age. The contribution of endothelium-derived NO increases in old male mice.
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Affiliation(s)
- Ramesh Chennupati
- Department of Anatomy and Embryology, Maastricht University, Maastricht, The Netherlands
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Brookes ZLS, Ruff L, Upadhyay VS, Huang L, Prasad S, Solanky T, Nauli SM, Ong ACM. Pkd2 mesenteric vessels exhibit a primary defect in endothelium-dependent vasodilatation restored by rosiglitazone. Am J Physiol Heart Circ Physiol 2012; 304:H33-41. [PMID: 23103499 DOI: 10.1152/ajpheart.01102.2011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Patients with autosomal dominant polycystic kidney disease have a high prevalence of hypertension and structural vascular abnormalities, such as intracranial aneurysms. Hypertension can develop in childhood and often precedes a significant reduction in the glomerular filtration rate. The major aim of this study was to investigate whether a primary endothelial defect or a vascular smooth muscle (VSM) defect was present in murine polycystic kidney disease (Pkd)2 heterozygous mesenteric vessels before the development of renal failure or hypertension. Using pressure myography, we observed a marked defect in ACh-stimulated endothelium-dependent vasodilatation in Pkd2 arterioles. In contrast, Pkd2 vessels responded normally to sodium nitroprusside, phenylephrine, KCl, and pressure, indicating unaltered VSM-dependent responses. Pretreatment with the peroxisome proliferator-activated receptor-γ agonist rosiglitazone significantly restored ACh-dependent vasodilation in Pkd2 mice. Isolated heterozygous Pkd2 endothelial cells displayed normal ACh-stimulated Ca(2+) and nitric oxide production. However, isolated Pkd2 heterozygous VSM cells displayed basal increases in superoxide and sodium nitroprusside-stimulated peroxynitrite formation, which were both suppressed by rosiglitazone. Furthermore, we observed a defective response of Pkd2 mesenteric venules to ACh in vivo, which was more marked after ischemia-reperfusion injury. In conclusion, the results of our study suggest that the defect in vasodilatation in Pkd2 heterozygous vessels is primarily due to a reduction in nitric bioavailability secondary to increased vascular oxidative stress. The ability of rosiglitazone to correct this phenotype suggests that this defect is potentially reversible in patients with autosomal dominant polycystic kidney disease.
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Affiliation(s)
- Zoë L S Brookes
- Microcirculation Research Group, Department of Cardiovascular Science, University of Sheffield Medical School, Beech Hill Road, Sheffield, UK
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Hyperhomocysteinemia impairs endothelium-derived hyperpolarizing factor-mediated vasorelaxation in transgenic cystathionine beta synthase-deficient mice. Blood 2011; 118:1998-2006. [PMID: 21653942 DOI: 10.1182/blood-2011-01-333310] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Hyperhomocysteinemia (HHcy) is associated with endothelial dysfunction (ED), but the mechanism is largely unknown. In this study, we investigated the role and mechanism of HHcy-induced ED in microvasculature in our newly established mouse model of severe HHcy (plasma total homocysteine, 169.5 μM). We found that severe HHcy impaired nitric oxide (NO)- and endothelium-derived hyperpolarizing factor (EDHF)-mediated, endothelium-dependent relaxations of small mesenteric arteries (SMAs). Endothelium-independent and prostacyclin-mediated endothelium-dependent relaxations were not changed. A nonselective Ca(2+)-activated potassium channel (K(Ca)) inhibitor completely blocked EDHF-mediated relaxation. Selective blockers for small-conductance K(Ca) (SK) or intermediate-conductance K(Ca) (IK) failed to inhibit EDHF-mediated relaxation in HHcy mice. HHcy increased the levels of SK3 and IK1 protein, superoxide (O(2)(-)), and 3-nitrotyrosine in the endothelium of SMAs. Preincubation with antioxidants and peroxynitrite (ONOO(-)) inhibitors improved endothelium-dependent and EDHF-mediated relaxations and decreased O(2)(-) production in SMAs from HHcy mice. Further, EDHF-mediated relaxation was inhibited by ONOO(-) and prevented by catalase in the control mice. Finally, L-homocysteine stimulated O(2)(-) production, which was reversed by antioxidants, and increased SK/IK protein levels and tyrosine nitration in cultured human cardiac microvascular endothelial cells. Our results suggest that HHcy impairs EDHF relaxation in SMAs by inhibiting SK/IK activities via oxidation- and tyrosine nitration-related mechanisms.
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Harrington LS, Lundberg MH, Waight M, Rozario A, Mitchell JA. Reduced endothelial dependent vasodilation in vessels from TLR4(-/-) mice is associated with increased superoxide generation. Biochem Biophys Res Commun 2011; 408:511-5. [PMID: 21513697 PMCID: PMC3105224 DOI: 10.1016/j.bbrc.2011.04.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Accepted: 04/06/2011] [Indexed: 01/13/2023]
Abstract
Toll like receptor (TLR)4 is a pattern recognition receptor expressed in endothelial and other cells, responsible for the sensing of endotoxin and host derived ligands. Our group has shown previously that the absence of TLR4 is associated with reduced endothelial dependent vasodilator responses and left heart hypertrophy in animal models. However, the mechanism behind reduced endothelial cell function in TLR4−/− mice is not known. We have used en face confocal imaging of mesenteric arteries from mice deficient in the TLR4 receptor stained with dihydroethidium (DHE) to measure superoxide production. Using the isometric wire myograph, mesenteric artery vasodilator responses to acetylcholine and MnCl2 (a superoxide dismutase mimetic) were measured. Mesenteric arteries from TLR4−/− mice had a reduced endothelial dependent relaxant response and increased superoxide levels when stimulated with acetylcholine. Increased levels of superoxide, as detected by DHE staining, were seen in vessels from TLR4−/− mice, which were reduced to control levels in the presence of MnCl2. Our observations suggest that loss of TLR4 increases superoxide generation which reduces the biological activity of endothelial derived nitric oxide and thereby explains the endothelial dysfunction and associated cardiovascular phenotype in TLR4−/− mice. These data implicate a novel cardio-protective role for TLR4 in vascular homeostasis.
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Černe K, Kristan KČ, Budihna MV, Stanovnik L. Mechanisms of changes in coronary arterial tone induced by bee venom toxins. Toxicon 2010; 56:305-12. [DOI: 10.1016/j.toxicon.2010.03.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2009] [Revised: 03/05/2010] [Accepted: 03/10/2010] [Indexed: 11/26/2022]
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Human endothelial dysfunction: EDRFs. Pflugers Arch 2010; 459:1005-13. [DOI: 10.1007/s00424-010-0822-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 03/03/2010] [Accepted: 03/04/2010] [Indexed: 02/02/2023]
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Tymvios C, Moore C, Jones S, Solomon A, Sanz-Rosa D, Emerson M. Platelet aggregation responses are critically regulated in vivo by endogenous nitric oxide but not by endothelial nitric oxide synthase. Br J Pharmacol 2010; 158:1735-42. [PMID: 19912226 DOI: 10.1111/j.1476-5381.2009.00408.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND AND PURPOSE Although exogenous nitric oxide (NO) clearly modifies platelet function, the role and the source of endogenous NO in vivo remain undefined. In addition, endothelial NO synthase (NOS-3) critically regulates vessel tone but its role in modulating platelet function is unclear. In this paper we have investigated the roles of endogenous NO and NOS-3 in regulating platelet function in vivo and determined the functional contribution made by platelet-derived NO. EXPERIMENTAL APPROACH We used a mouse model for directly assessing platelet functional responses in situ in the presence of an intact vascular endothelium with supporting in vitro and molecular studies. KEY RESULTS Acute NOS inhibition by N(omega)-nitro-L-arginine methyl ester hydrochloride (L-NAME) enhanced platelet aggregatory responses to thrombin and platelets were shown to be regulated primarily by NO sources external to the platelet. Elevation of endogenous NOS inhibitors to mimic effects reported in patients with cardiovascular diseases did not enhance platelet responses. Platelet responsiveness following agonist stimulation was not modified in male or female NOS-3(-/-) mice but responses in NOS-3(-/-) mice were enhanced by L-NAME. CONCLUSIONS AND IMPLICATIONS Platelets are regulated by endogenous NO in vivo, primarily by NO originating from the environment external to the platelet with a negligible or undetectable role of platelet-derived NO. Raised levels of endogenous NOS inhibitors, as reported in a range of diseases were not, in isolation, sufficient to enhance platelet activity and NOS-3 is not essential for normal platelet function in vivo due to the presence of bioactive NO following deletion of NOS-3.
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Affiliation(s)
- C Tymvios
- Molecular Medicine Section, National Heart and Lung Institute, Imperial College London, London, UK
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Serban DN, Nilius B, Vanhoutte PM. The endothelial saga: the past, the present, the future. Pflugers Arch 2010; 459:787-92. [PMID: 20213495 DOI: 10.1007/s00424-010-0805-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Accepted: 02/13/2010] [Indexed: 02/07/2023]
Abstract
Endothelium-dependent changes in vasomotor tone, whether evoked by vasoactive agents or physical forces, are recognized as essential for the local hemodynamic control in various normal and pathological circumstances. They are based on a complex signaling network within the vascular wall. In recent years, substantial efforts have been made to analyze how such signals are generated and used in the endothelium-dependent control of vascular smooth muscle. The underlying mechanisms vary with species, age, sex, hormonal status, vascular bed studied, caliber of the blood vessels, triggering stimuli, pre-existing vascular tone, oxidative stress, and pathology. Such aspects and many others will be addressed specifically by the authors contributing to this volume.
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Affiliation(s)
- Dragomir N Serban
- Laboratory of Cell Physiology and Pharmacology, Center for Study and Therapy of Pain, Gr. T. Popa University of Medicine and Pharmacy, 16 Universitatii Str., 700115, Iasi, Romania
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Harrington LS, Moreno L, Reed A, Wort SJ, Desvergne B, Garland C, Zhao L, Mitchell JA. The PPARbeta/delta agonist GW0742 relaxes pulmonary vessels and limits right heart hypertrophy in rats with hypoxia-induced pulmonary hypertension. PLoS One 2010; 5:e9526. [PMID: 20209098 PMCID: PMC2831997 DOI: 10.1371/journal.pone.0009526] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2009] [Accepted: 12/28/2009] [Indexed: 01/29/2023] Open
Abstract
Background Pulmonary vascular diseases are increasingly recognised as important clinical conditions. Pulmonary hypertension associated with a range of aetiologies is difficult to treat and associated with progressive morbidity and mortality. Current therapies for pulmonary hypertension include phosphodiesterase type 5 inhibitors, endothelin receptor antagonists, or prostacyclin mimetics. However, none of these provide a cure and the clinical benefits of these drugs individually decline over time. There is, therefore, an urgent need to identify new treatment strategies for pulmonary hypertension. Methodology/Principal Findings Here we show that the PPARβ/δ agonist GW0742 induces vasorelaxation in systemic and pulmonary vessels. Using tissue from genetically modified mice, we show that the dilator effects of GW0742 are independent of the target receptor PPARβ/δ or cell surface prostacyclin (IP) receptors. In aortic tissue, vascular relaxant effects of GW0742 were not associated with increases in cGMP, cAMP or hyperpolarisation, but were attributed to inhibition of RhoA activity. In a rat model of hypoxia-induced pulmonary hypertension, daily oral dosing of animals with GW0742 (30 mg/kg) for 3 weeks significantly reduced the associated right heart hypertrophy and right ventricular systolic pressure. GW0742 had no effect on vascular remodelling induced by hypoxia in this model. Conclusions/Significance These observations are the first to show a therapeutic benefit of ‘PPARβ/δ’ agonists in experimental pulmonary arterial hypertension and provide pre-clinical evidence to favour clinical trials in man.
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Affiliation(s)
| | - Laura Moreno
- Cardiothoracic Pharmacology, NHLI, Imperial College London, United Kingdom
| | - Anna Reed
- Cardiothoracic Pharmacology, NHLI, Imperial College London, United Kingdom
| | - Stephen J. Wort
- Critical Care Medicine, NHLI, Royal Brompton Hospital, London, United Kingdom
| | - Béatrice Desvergne
- Center for Integrative Genomics, University of Lausanne, Genopode, Lausanne, Switzerland
| | | | - Lan Zhao
- Experimental Medicine and Toxicology, Hammersmith Hospital, Imperial College London, London, United Kingdom
| | - Jane A. Mitchell
- Cardiothoracic Pharmacology, NHLI, Imperial College London, United Kingdom
- * E-mail:
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Hein TW, Singh U, Vasquez-Vivar J, Devaraj S, Kuo L, Jialal I. Human C-reactive protein induces endothelial dysfunction and uncoupling of eNOS in vivo. Atherosclerosis 2009; 206:61-8. [PMID: 19268941 DOI: 10.1016/j.atherosclerosis.2009.02.002] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2008] [Revised: 01/18/2009] [Accepted: 02/01/2009] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVE Elevated C-reactive protein (CRP) levels are associated with increased cardiovascular events and endothelial dysfunction. We have previously shown that CRP decreases endothelial nitric oxide synthase (eNOS) activity in endothelial cells and inhibits endothelium-dependent nitric oxide (NO)-mediated vasodilation in vitro. Herein, we examined the effect of in vivo administration of CRP on endothelial function and underlying mechanisms in a valid animal model. METHODS Sprague-Dawley rats were injected intraperitoneally daily for 3 days with human CRP or human serum albumin (HuSA) at 20 mg/kg body weight. On day 4, mesenteric arterioles were isolated and pressurized for vasomotor study and aortic tissue was subjected to biochemical and molecular analysis. RESULTS Dilation of mesenteric arterioles to acetylcholine but not to sodium nitroprusside was significantly reduced following CRP treatment. The eNOS activity, eNOS dimer/monomer ratio, tetrahydrobiopterin levels, and protein expression of GTPCH1 were significantly lower in aortic tissue homogenates from CRP-treated than HuSA-treated rats. CRP treatment also resulted in increased dihydroethidium staining for superoxide in aortic endothelium and membrane translocation of p47phox, a regulatory subunit of NADPH oxidase. CONCLUSION Our data provide novel evidence for the detrimental action of CRP in vivo by impairing eNOS-dependent vasodilation and uncoupling of eNOS.
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Affiliation(s)
- Travis W Hein
- Department of Surgery, Scott & White Memorial Hospital, College of Medicine, Texas A&M Health Science Center, Temple, TX, USA
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Hercule HC, Schunck WH, Gross V, Seringer J, Leung FP, Weldon SM, da Costa Goncalves AC, Huang Y, Luft FC, Gollasch M. Interaction Between P450 Eicosanoids and Nitric Oxide in the Control of Arterial Tone in Mice. Arterioscler Thromb Vasc Biol 2009; 29:54-60. [DOI: 10.1161/atvbaha.108.171298] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Hantz C. Hercule
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Wolf-Hagen Schunck
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Volkmar Gross
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Jasmin Seringer
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Fung Ping Leung
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Steven M. Weldon
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Andrey Ch. da Costa Goncalves
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Yu Huang
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Friedrich C. Luft
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
| | - Maik Gollasch
- From the Charité Campus Buch, Franz Volhard Clinic/ECRC and HELIOS Klinikum-Berlin, Nephrology/Intensive Care Section, Charité Campus Virchow (H.C.A., J.S., M.G.), and Max Delbrück Center for Molecular Medicine, Berlin, Germany (W.-H.S., V.G., A.Ch.daC.G.); the Department of Physiology, the Chinese University of Hong Kong, China (P.L., Y.H.); and Cardiovascular Disease, Boehringer Ingelheim Pharmaceuticals Inc, Ridgefield, Conn (S.M.W.)
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15
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Endothelium-dependent vasodilation in conduit and resistance vessels in relation to the endothelial nitric oxide synthase gene. J Hum Hypertens 2008; 22:569-78. [DOI: 10.1038/jhh.2008.37] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Looft-Wilson RC, Ashley BS, Billig JE, Wolfert MR, Ambrecht LA, Bearden SE. Chronic diet-induced hyperhomocysteinemia impairs eNOS regulation in mouse mesenteric arteries. Am J Physiol Regul Integr Comp Physiol 2008; 295:R59-66. [PMID: 18448615 DOI: 10.1152/ajpregu.00833.2007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hyperhomocysteinemia (HHcy) impairs endothelium-dependent vasodilation by increasing reactive oxygen species, thereby reducing nitric oxide (NO.) bioavailability. It is unclear whether reduced expression or function of the enzyme that produces NO., endothelial nitric oxide synthase (eNOS), also contributes. It is also unclear whether resistance vessels that utilize both NO.and non-NO.vasodilatory mechanisms, undergo alteration of non-NO.mechanisms in this condition. We tested these hypotheses in male C57BL/6 mice with chronic HHcy induced by 6-wk high methionine/low-B vitamin feeding (Hcy: 89.2 +/- 49.0 microM) compared with age-matched controls (Hcy: 6.6 +/- 1.9 microM), using first-order mesenteric arteries. Dilation to ACh (10(-9)-10(-4) M) was measured in isolated, cannulated, and pressurized (75 mmHg) arteries with and without N(G)-nitro-l-arginine methyl ester (l-NAME) (10(-4) M) and/or indomethacin (10(-5) M) to test endothelium-dependent dilation and non-NO.-dependent dilation, respectively. The time course of dilation to ACh (10(-4) M) was examined to compare the initial transient dilation due to non-NO., non-prostacyclin mechanism and the sustained dilation due to NO.. These experiments indicated that endothelium-dependent dilation was attenuated (P < 0.05) in HHcy arteries due to downregulation of only NO.-dependent dilation. Western blot analysis indicated significantly less (P < 0.05) basal eNOS and phospho-S1179-eNOS/eNOS in mesenteric arteries from HHcy mice but no difference in phospho-T495-eNOS/eNOS. S1179 eNOS phosphorylation was also significantly less in these arteries when stimulated with ACh ex vivo or in situ. Real-time PCR indicated no difference in eNOS mRNA levels. In conclusion, chronic diet-induced HHcy in mice impairs eNOS protein expression and phosphorylation at S1179, coincident with impaired NO.-dependent dilation, which implicates dysfunction in eNOS post-transcriptional regulation in the impaired endothelium-dependent vasodilation and microvascular disease that is common with HHcy.
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Affiliation(s)
- Robin C Looft-Wilson
- College of William and Mary, Department of Kinesiology, Williamsburg, Virginia 23187-8795, USA.
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17
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Mitchell JA, Ali F, Bailey L, Moreno L, Harrington LS. Role of nitric oxide and prostacyclin as vasoactive hormones released by the endothelium. Exp Physiol 2007; 93:141-7. [DOI: 10.1113/expphysiol.2007.038588] [Citation(s) in RCA: 178] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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