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Tomazelli CA, Ishikawa FM, Couto GK, Parente JM, Castro MMD, Xavier FE, Rossoni LV. Small artery remodeling and stiffening in deoxycorticosterone acetate-salt hypertensive rats involves the interaction between endogenous ouabain/Na + K + -ATPase/cSrc signaling. J Hypertens 2023; 41:1554-1564. [PMID: 37432904 DOI: 10.1097/hjh.0000000000003502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
OBJECTIVE Endogenous ouabain (EO) increases in some patients with hypertension and in rats with volume-dependent hypertension. When ouabain binds to Na + K + -ATPase, cSrc is activated, which leads to multieffector signaling activation and high blood pressure (BP). In mesenteric resistance arteries (MRA) from deoxycorticosterone acetate (DOCA)-salt rats, we have demonstrated that the EO antagonist rostafuroxin blocks downstream cSrc activation, enhancing endothelial function and lowering oxidative stress and BP. Here, we examined the possibility that EO is involved in the structural and mechanical alterations that occur in MRA from DOCA-salt rats. METHODS MRA were taken from control, vehicle-treated DOCA-salt or rostafuroxin (1 mg/kg per day, for 3 weeks)-treated DOCA-salt rats. Pressure myography and histology were used to evaluate the mechanics and structure of the MRA, and western blotting to assess protein expression. RESULTS DOCA-salt MRA exhibited signs of inward hypertrophic remodeling and increased stiffness, with a higher wall:lumen ratio, which were reduced by rostafuroxin treatment. The enhanced type I collagen, TGFβ1, pSmad2/3 Ser465/457 /Smad2/3 ratio, CTGF, p-Src Tyr418 , EGFR, c-Raf, ERK1/2 and p38MAPK protein expression in DOCA-salt MRA were all recovered by rostafuroxin. CONCLUSION A process combining Na + K + -ATPase/cSrc/EGFR/Raf/ERK1/2/p38MAPK activation and a Na + K + -ATPase/cSrc/TGF-1/Smad2/3/CTGF-dependent mechanism explains how EO contributes to small artery inward hypertrophic remodeling and stiffening in DOCA-salt rats. This result supports the significance of EO as a key mediator for end-organ damage in volume-dependent hypertension and the efficacy of rostafuroxin in avoiding remodeling and stiffening of small arteries.
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Affiliation(s)
| | | | | | | | | | - Fabiano Elias Xavier
- Department of Physiology and Pharmacology, Biosciences Center, Federal University of Pernambuco, Recife, Brazil
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2
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França-Neto AD, Couto GK, Xavier FE, Rossoni LV. Cyclooxygenase-2 is a critical determinant of angiotensin II-induced vascular remodeling and stiffness in resistance arteries of ouabain-treated rats. J Hypertens 2022; 40:2180-2191. [PMID: 35969208 DOI: 10.1097/hjh.0000000000003242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To investigate the role of angiotensin II/AT 1 receptor signaling and/or cyclooxygenase-2 (COX-2) activation on vascular remodeling and stiffening of the mesenteric resistance arteries (MRA) of ouabain-treated rats. METHODS Ouabain-treated (OUA, 30 μg kg/day for 5 weeks) and vehicle (VEH)-treated Wistar rats were co-treated with losartan (LOS, AT 1 R antagonist), nimesulide (NIM, COX-2 inhibitor) or hydralazine hydrochloride plus hydrochlorothiazide. MRA structure and mechanics were assessed with pressure myography and histology. Picrosirius red staining was used to determine the total collagen content. Western blotting was used to detect the expression of collagen I/III, MMP-2, Src, NFκB, Bax, Bcl-2 and COX-2. Reactive oxygen species (ROS) and plasma angiotensin II levels were measured by fluorescence and ELISA, respectively. RESULTS Blockade of AT 1 R or inhibition of COX-2 prevented ouabain-induced blood pressure elevation. Plasma angiotensin II level was higher in OUA than in VEH. LOS, but not hydralazine hydrochloride with hydrochlorothiazide, prevented inward hypotrophic remodeling, increased collagen deposition and stiffness, and oxidative stress in OUA MRA. LOS prevented the reduction in the total number of nuclei in the media layer and the Bcl-2 expression induced by OUA in MRA. The higher pSrc/Src ratio, NFκB/IκB ratio, and COX-2 expression in OUA MRA were also prevented by LOS. Likewise, COX-2 inhibition prevented vascular remodeling, mechanical changes, oxidative stress and inflammation in OUA MRA. CONCLUSION The results suggest that, regardless of hemodynamic adjustments, the angiotensin II/AT 1 R/pSrc/ROS/NFκB/COX-2 pathway is involved in the development of MRA inward hypotrophic remodeling and stiffness in ouabain-treated rats.
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Affiliation(s)
- Aldair de França-Neto
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo
| | - Gisele Kruger Couto
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo
| | - Fabiano Elias Xavier
- Department of Physiology and Pharmacology, Biosciences Center, Federal University of Pernambuco, Recife, Brazil
| | - Luciana Venturini Rossoni
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo
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3
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Peixoto P, Vieira-Alves I, Couto GK, Lemos VS, Rossoni LV, Bissoli NS, Dos Santos RL. Sex differences in the participation of endothelial mediators and signaling pathways involved in the vasodilator effect of a selective GPER agonist in resistance arteries of gonadectomized Wistar rats. Life Sci 2022; 308:120917. [PMID: 36044974 DOI: 10.1016/j.lfs.2022.120917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 08/16/2022] [Accepted: 08/24/2022] [Indexed: 11/15/2022]
Abstract
AIM Endothelial mechanisms underlying the vascular effects of estrogen modulated by the G protein-coupled estrogen receptor (GPER) are not well understood, especially in gonadal sex hormone deprivation. Thus, we investigated vascular function and endothelial signaling pathways involved in the selective activation of GPER in resistance arteries of gonadectomized rats. METHODS Gonadectomy was performed in Wistar rats of both sexes. After 21 days, the animals were euthanized. Concentration-response curves were obtained by cumulative additions of G-1 in third-order mesenteric arteries. The vasodilatory effects of G-1 were evaluated before and after endothelium removal or incubation with pharmacological inhibitors. Tissue protein expression was measured by western blotting. Assays with 4-amino-5-methylamino-2',7'-difluorofluorescein diacetate (DAF-FM) and 2',7' dichlorodihydrofluorescein-diacetate (DCF-DA) were performed in the arteries investigated. Immunolocalization was assessed by immunofluorescence. RESULTS G-1 induced partially endothelium-dependent relaxation in both sexes. The three isoforms of the enzyme nitric oxide synthase contributed to the production and release of nitric oxide in both gonadectomized groups, but the role of inducible nitric oxide synthase is more expressive in males. The mechanistic pathway by which endothelial nitric oxide synthase is phosphorylated appears to differ between sexes, with the rapid signaling pathway phosphatidylinositol-3-kinase/protein kinase B/endothelial nitric oxide synthase (PI3k-Akt-eNOS) being identified for males and mitogen-activated protein kinase/extracellular signal-regulated kinase/endothelial nitric oxide synthase (MEK-ERK-eNOS) for females. The contribution of hydrogen peroxide as an endothelial relaxation mediator seems to be greater in females. CONCLUSION These results provide new insights into the effects of estrogen-induced responses via GPER on vascular function in gonadal sex hormone deprivation.
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Affiliation(s)
- Pollyana Peixoto
- Department of Physiological Sciences, Universidade Federal do Espírito Santo, Vitoria, ES, Brazil
| | - Ildernandes Vieira-Alves
- Department of Physiology and Biophysics, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Gisele Kruger Couto
- Department of Physiology and Biophysics, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Virgínia Soares Lemos
- Department of Physiology and Biophysics, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | | | - Nazaré Souza Bissoli
- Department of Physiological Sciences, Universidade Federal do Espírito Santo, Vitoria, ES, Brazil
| | - Roger Lyrio Dos Santos
- Department of Physiological Sciences, Universidade Federal do Espírito Santo, Vitoria, ES, Brazil.
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Dardi P, Perazza LR, Couto GK, Campos GP, Capettini LDSA, Rossoni LV. Vena cava presents endothelial dysfunction prior to thoracic aorta in heart failure: the pivotal role of nNOS uncoupling/oxidative stress. Clin Sci (Lond) 2021; 135:2625-2641. [PMID: 34783347 DOI: 10.1042/cs20210810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 11/05/2021] [Accepted: 11/15/2021] [Indexed: 11/17/2022]
Abstract
Arterial endothelial dysfunction has been extensively studied in heart failure (HF). However, little is known about the adjustments shown by the venous system in this condition. Considering that inferior vena cava (VC) tone could influence cardiac performance and HF prognosis, the aim of the present study was to assess the VC and thoracic aorta (TA) endothelial function of HF-post-myocardial infarction (MI) rats, comparing both endothelial responses and signaling pathways developed. Vascular reactivity of TA and VC from HF post-MI and sham operated (SO) rats was assessed with a wire myograph, 4 weeks after coronary artery occlusion surgery. Nitric oxide (NO), H2O2 production and oxidative stress were evaluated in situ with fluorescent probes, while protein expression and dimer/monomer ratio was assessed by Western blot. VC from HF rats presented endothelial dysfunction, while TA exhibited higher acetylcholine (ACh)-induced vasodilation when compared with vessels from SO rats. TA exhibited increased ACh-induced NO production due to a higher coupling of endothelial and neuronal NO synthases isoforms (eNOS, nNOS), and enhanced expression of antioxidant enzymes. These adjustments, however, were absent in VC of HF post-MI rats, which exhibited uncoupled nNOS, oxidative stress and higher H2O2 bioavailability. Altogether, the present study suggests a differential regulation of endothelial function between VC and TA of HF post-MI rats, most likely due to nNOS uncoupling and compromised antioxidant defense.
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Affiliation(s)
- Patrizia Dardi
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Laís Rossi Perazza
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Gisele Kruger Couto
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Gianne Paul Campos
- Department of Pharmacology, Institute of Biological Science, University of Minas Gerais, Minas Gerais, Brazil
| | | | - Luciana Venturini Rossoni
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil
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de Oliveira HT, Couto GK, Davel AP, Xavier FE, Rossoni LV. Chronic cyclooxygenase-2 inhibition prevents the worsening of hypertension and endothelial dysfunction induced by ouabain in resistance arteries of spontaneously hypertensive rats. Vascul Pharmacol 2021; 139:106880. [PMID: 34052431 DOI: 10.1016/j.vph.2021.106880] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/21/2021] [Accepted: 05/25/2021] [Indexed: 01/16/2023]
Abstract
AIM Previous studies raise cyclooxygenase (COX) activation as a possible mechanism involved in the pathophysiology of ouabain-induced hypertension. We hypothesized that inhibition of COX-2 activity might prevent ouabain-induced vascular dysfunction and worsening of hypertension in spontaneously hypertensive rats (SHR). METHODS SHR were exposed to ouabain or vehicle and treated or not with the selective COX-2 inhibitor nimesulide for 5 weeks. Systolic blood pressure was measured by plethysmography. Vascular reactivity by wire myograph and protein expression by Western-blot were assessed in mesenteric resistance arteries (MRA) of groups. Thromboxane A2 (TXA2) production by ELISA was evaluated in MRA supernatants of groups. RESULTS Noradrenaline-induced maximal contraction (Emax) was greater in MRA from SHR receiving ouabain than those of vehicle group. In situ inhibition of COX-2, TXA2 synthase, or TP receptor reduced the Emax to noradrenaline in MRA of ouabain to vehicle levels. TXA2 production was higher in ouabain than in vehicle group. Ouabain enhanced expression of cytoplasmic tyrosine kinase Src (c-Src)/ERK1/2/COX-2/TXA2 synthase/TP receptor in SHR MRA, but did not change NFkB/iKB ratio. Anticontractile effect of nitric oxide (NO) was smaller in MRA from ouabain- than vehicle-treated SHR, as well as eNOS and nNOS expression. Nimesulide co-treatment prevented the ouabain-induced worsening of hypertension and noradrenaline MRA hypercontractility in SHR. CONCLUSION Ouabain worsen hypertension and induce MRA hypercontractility in SHR associated with upregulated c-Src/ERK1/2/COX-2/TXA2 synthase/TXA2/TP receptor axis. These effects were prevented by COX-2 inhibition.
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Affiliation(s)
- Helane Tito de Oliveira
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Gisele Kruger Couto
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil
| | - Ana Paula Davel
- Department of Structural and Functional Biology, University of Campinas, Campinas, Brazil
| | - Fabiano Elias Xavier
- Department of Physiology and Pharmacology, Biosciences Center, Federal University of Pernambuco, Recife, Brazil
| | - Luciana Venturini Rossoni
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of Sao Paulo, Sao Paulo, Brazil.
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Couto GK, Fernandes RO, Lacerda D, Campos-Carraro C, Turck P, Bianchi SE, Ferreira GD, Brum IS, Bassani VL, Bello-Klein A, Araujo ASR. Profile of pterostilbene-induced redox homeostasis modulation in cardiac myoblasts and heart tissue. J Biosci 2018; 43:931-940. [PMID: 30541953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This study was designed to investigate the effect of pterostilbene (PTS) on cardiac oxidative stress in vitro, as this is a simple and promising methodology to study cardiac disease. Cardiac myoblasts (H9c2 cells) and homogenised cardiac tissue were incubated with the PTS and cyclodextrin (PTS + HPβCD) complex for 1 and 24 h, respectively, at concentrations of 50μM for the cells and 25 and 50μM for cardiac tissue. The PTS + HPβCD complex was used to increase the solubility of PTS in water. After the pretreatment period, cardiomyoblasts were challenged with hydrogen peroxide (6.67μM) for 10 min, while cardiac tissue was submitted to a hydroxyl radical generator system (30 min). Cellular viability, oxidative stress biomarkers (e.g. total reactive oxygen species (ROS), carbonyl assay and lipoperoxidation) and the antioxidant response (e.g. sulfhydryl and the antioxidant enzyme activities of superoxide dismutase, catalase and glutathione peroxidase) were evaluated. In cardiomyoblasts, the PTS + HPβCD complex (50μM) increased cellular viability. Moreover, the PTS + HPβCD complex also significantly increased sulfhydryl levels in the cells submitted to an oxidative challenge. In cardiac tissue, lipid peroxidation, carbonyls and ROS levels were significantly increased in the groups submitted to oxidative damage, while the PTS + HPβCD complex significantly reduced ROS levels in these groups. In addition, the PTS + HPβCD complex also provoked increased catalase activity in both experimental protocols. These data suggest that the PTS + HPβCD complex may play a cardioprotective role through a reduction of ROS levels associated with an improved antioxidant response.
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Affiliation(s)
- G K Couto
- Postgraduate Program in Pharmacology and Therapeutics, Department of Physiology, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
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Couto GK, Fernandes RO, Lacerda D, Campos-Carraro C, Türck P, Bianchi SE, Ferreira GD, Brum IS, Bassani VL, Belló-Klein A, Araujo ASR. Profile of pterostilbene-induced redox homeostasis modulation in cardiac myoblasts and heart tissue. J Biosci 2018. [DOI: 10.1007/s12038-018-9815-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Casare FAM, Thieme K, Costa-Pessoa JM, Rossoni LV, Couto GK, Fernandes FB, Casarini DE, Oliveira-Souza M. Renovascular remodeling and renal injury after extended angiotensin II infusion. Am J Physiol Renal Physiol 2016; 310:F1295-307. [PMID: 26962104 DOI: 10.1152/ajprenal.00471.2015] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 03/05/2016] [Indexed: 11/22/2022] Open
Abstract
Chronic angiotensin II (ANG II) infusion for 1 or 2 wk leads to progressive hypertension and induces inward hypertrophic remodeling in preglomerular vessels, which is associated with increased renal vascular resistance (RVR) and decreased glomerular perfusion. Considering the ability of preglomerular vessels to exhibit adaptive responses, the present study was performed to evaluate glomerular perfusion and renal function after 6 wk of ANG II infusion. To address this study, male Wistar rats were submitted to sham surgery (control) or osmotic minipump insertion (ANG II 200 ng·kg(-1)·min(-1), 42 days). A group of animals was treated or cotreated with losartan (10 mg·kg(-1)·day(-1)), an AT1 receptor antagonist, between days 28 and 42 Chronic ANG II infusion increased systolic blood pressure to 185 ± 4 compared with 108 ± 2 mmHg in control rats. Concomitantly, ANG II-induced hypertension increased intrarenal ANG II level and consequently, preglomerular and glomerular injury. Under this condition, ANG II enhanced the total renal plasma flow (RPF), glomerular filtration rate (GFR), urine flow and induced pressure natriuresis. These changes were accompanied by lower RVR and enlargement of the lumen of interlobular arteries and afferent arterioles, consistent with impairment of renal autoregulatory capability and outward preglomerular remodeling. The glomerular injury culminated with podocyte effacement, albuminuria, tubulointerstitial macrophage infiltration and intrarenal extracellular matrix accumulation. Losartan attenuated most of the effects of ANG II. Our findings provide new information regarding the contribution of ANG II infusion over 2 wk to renal hemodynamics and function via the AT1 receptor.
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Affiliation(s)
| | - Karina Thieme
- Laboratory of Cellular and Molecular Endocrinology, Medical School, University of Sao Paulo, Sao Paulo, Brazil; and
| | - Juliana Martins Costa-Pessoa
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - Luciana Venturini Rossoni
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | - Gisele Kruger Couto
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil
| | | | - Dulce Elena Casarini
- Division of Nephrology, Department of Medicine, Federal University of Sao Paulo, Sao Paulo, Brazil
| | - Maria Oliveira-Souza
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo, Brazil;
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9
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Davel AP, Couto GK, Wenceslau CF, Peres EC, Xavier FE, Rossoni LV. Enhanced Na⁺, K⁺-ATPase activity and endothelial modulation decrease phenylephrine-induced contraction in aorta from ouabain-treated normotensive and hypertensive rats. Horm Mol Biol Clin Investig 2014; 18:113-22. [PMID: 25390007 DOI: 10.1515/hmbci-2013-0058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 11/20/2013] [Indexed: 11/15/2022]
Abstract
AIM The purpose of this study was to compare the effect of long-term ouabain treatment on the vascular reactivity and Na+, K+-ATPase activity of a conductance artery from normotensive and hypertensive rats. METHODS Male Wistar rats were treated with ouabain (~8.0 µg/day, subcutaneously) or vehicle for 5 and 20 weeks, and spontaneously hypertensive rats (SHRs) for 5 weeks. Vasoconstrictor response to phenylephrine (10-10 to 10-4 M) and relaxation curves to KCl (1-10 mM) were analyzed in thoracic aorta. The effects of endothelial removal, L-NAME (100 μM), and indomethacin (10 μM) were used to evaluate the endothelial, nitric oxide (NO), and cyclooxygenase (COX) modulation of phenylephrine response, respectively. Protein expression of endothelial and neuronal NO synthase (NOS) and COX-2 were also investigated. RESULTS The phenylephrine-induced contraction was reduced, whereas the relaxation to KCl was enhanced in the aorta of ouabain-treated Wistar rats and SHRs. In both strains, endothelial modulation of α-adrenergic response was enhanced, related to an increased NO and reduced COX-derived vasoconstrictor factor modulation. Aortas from 20-week ouabain-treated Wistar rats showed reduced COX-2 and enhanced eNOS protein expression. In SHRs, 5-week ouabain treatment reduced COX-2 and increased nNOS protein expression. CONCLUSIONS The results suggest that long-term ouabain treatment reduces the α-adrenergic response of aorta from normotensive rats and SHRs, associated with an increase of NO synthesis, reduced COX-2-derived vasoconstrictor factors, and enhanced ouabain-sensitive Na+, K+-ATPase activity. These aortic mechanisms could be adjustments to the elevated blood pressure induced by ouabain, even in the presence of preexisting hypertension.
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MESH Headings
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/physiology
- Blood Pressure/drug effects
- Cyclooxygenase 2/metabolism
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/physiology
- Hypertension/metabolism
- Hypertension/physiopathology
- Male
- Muscle Contraction
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Nitric Oxide Synthase Type I/metabolism
- Nitric Oxide Synthase Type III/metabolism
- Ouabain/pharmacology
- Phenylephrine/pharmacology
- Rats, Inbred SHR
- Rats, Wistar
- Sodium-Potassium-Exchanging ATPase/antagonists & inhibitors
- Sodium-Potassium-Exchanging ATPase/metabolism
- Species Specificity
- Vasoconstriction/drug effects
- Vasoconstrictor Agents/pharmacology
- Vasodilation/drug effects
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Gomes-Santos IL, Fernandes T, Couto GK, Ferreira-Filho JCA, Salemi VMC, Fernandes FB, Casarini DE, Brum PC, Rossoni LV, de Oliveira EM, Negrao CE. Effects of exercise training on circulating and skeletal muscle renin-angiotensin system in chronic heart failure rats. PLoS One 2014; 9:e98012. [PMID: 24859374 PMCID: PMC4032232 DOI: 10.1371/journal.pone.0098012] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Accepted: 04/28/2014] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Accumulated evidence shows that the ACE-AngII-AT1 axis of the renin-angiotensin system (RAS) is markedly activated in chronic heart failure (CHF). Recent studies provide information that Angiotensin (Ang)-(1-7), a metabolite of AngII, counteracts the effects of AngII. However, this balance between AngII and Ang-(1-7) is still little understood in CHF. We investigated the effects of exercise training on circulating and skeletal muscle RAS in the ischemic model of CHF. METHODS/MAIN RESULTS Male Wistar rats underwent left coronary artery ligation or a Sham operation. They were divided into four groups: 1) Sedentary Sham (Sham-S), 2) exercise-trained Sham (Sham-Ex), sedentary CHF (CHF-S), and exercise-trained CHF (CHF-Ex). Angiotensin concentrations and ACE and ACE2 activity in the circulation and skeletal muscle (soleus and plantaris) were quantified. Skeletal muscle ACE and ACE2 protein expression, and AT1, AT2, and Mas receptor gene expression were also evaluated. CHF reduced ACE2 serum activity. Exercise training restored ACE2 and reduced ACE activity in CHF. Exercise training reduced plasma AngII concentration in both Sham and CHF rats and increased the Ang-(1-7)/AngII ratio in CHF rats. CHF and exercise training did not change skeletal muscle ACE and ACE2 activity and protein expression. CHF increased AngII levels in both soleus and plantaris muscle, and exercise training normalized them. Exercise training increased Ang-(1-7) in the plantaris muscle of CHF rats. The AT1 receptor was only increased in the soleus muscle of CHF rats, and exercise training normalized it. Exercise training increased the expression of the Mas receptor in the soleus muscle of both exercise-trained groups, and normalized it in plantaris muscle. CONCLUSIONS Exercise training causes a shift in RAS towards the Ang-(1-7)-Mas axis in skeletal muscle, which can be influenced by skeletal muscle metabolic characteristics. The changes in RAS circulation do not necessarily reflect the changes occurring in the RAS of skeletal muscle.
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Affiliation(s)
| | - Tiago Fernandes
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Gisele Kruger Couto
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of São Paulo, São Paulo, Brazil
| | | | - Vera Maria Cury Salemi
- Heart Institute (InCor-HCFMUSP), University of São Paulo Medical School, São Paulo, Brazil
| | - Fernanda Barrinha Fernandes
- Division of Nephrology, Kidney and Hypertension Hospital, Federal University of São Paulo, São Paulo, Brazil
| | - Dulce Elena Casarini
- Division of Nephrology, Kidney and Hypertension Hospital, Federal University of São Paulo, São Paulo, Brazil
| | - Patricia Chakur Brum
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | - Luciana Venturini Rossoni
- Department of Physiology and Biophysics, Institute of Biomedical Science, University of São Paulo, São Paulo, Brazil
| | | | - Carlos Eduardo Negrao
- Heart Institute (InCor-HCFMUSP), University of São Paulo Medical School, São Paulo, Brazil
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
- * E-mail:
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11
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Couto GK, Lorenzini PF, Pilger DA, Azevedo LA, Weber C, Macedo JL, Diedrich V, de Castro SM. Association of hemoglobin E-Saskatoon with hemoglobin S: report of the first case found in Brazil. Acta Haematol 2013; 131:84-7. [PMID: 24081202 DOI: 10.1159/000353471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 06/02/2013] [Indexed: 02/02/2023]
Affiliation(s)
- G K Couto
- School of Pharmacy, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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12
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Baraldi D, Casali K, Fernandes RO, Campos C, Sartório C, Conzatti A, Couto GK, Schenkel PC, Belló-Klein A, Araujo ARS. The role of AT1-receptor blockade on reactive oxygen species and cardiac autonomic drive in experimental hyperthyroidism. Auton Neurosci 2013; 177:163-9. [PMID: 23623788 DOI: 10.1016/j.autneu.2013.04.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 04/02/2013] [Accepted: 04/03/2013] [Indexed: 11/19/2022]
Abstract
The objective of this study was to explore the influence of the renin-angiotensin system on cardiac prooxidants and antioxidants levels and its association to autonomic imbalance induced by hyperthyroidism. Male Wistar rats were divided into four groups: control, losartan (10mg/kg/day by gavage, 28 day), thyroxine (T4) (12 mg/L in drinking water for 28 days), and T4+losartan. Spectral analysis (autonomic balance), angiotensin II receptor (AT1R), NADPH oxidase, Nrf2 and heme-oxygenase-1 (HO-1) myocardial protein expression, and hydrogen peroxide (H2O2) concentration were quantified. Autonomic imbalance induced by hyperthyroidism (~770%) was attenuated in the T4+losartan group (~32%) (P<0.05). AT1R, NADPH oxidase, H2O2, as well as concentration, Nrf2 and HO-1 protein expression were elevated (~172%, 43%, 40%, 133%, and 154%, respectively) in T4 group (P<0.05). H2O2 and HO-1 levels were returned to control values in the T4+losartan group (P<0.05). The overall results demonstrate a positive impact of RAS blockade in the autonomic control of heart rate, which was associated with an attenuation of H2O2 levels, as well as with a reduced counter-regulatory response of HO-1 in experimental hyperthyroidism.
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Affiliation(s)
- D Baraldi
- Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil
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Delbin MA, Davel APC, Couto GK, de Araújo GG, Rossoni LV, Antunes E, Zanesco A. Interaction between advanced glycation end products formation and vascular responses in femoral and coronary arteries from exercised diabetic rats. PLoS One 2012; 7:e53318. [PMID: 23285277 PMCID: PMC3532341 DOI: 10.1371/journal.pone.0053318] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Accepted: 11/29/2012] [Indexed: 01/28/2023] Open
Abstract
Background The majority of studies have investigated the effect of exercise training (TR) on vascular responses in diabetic animals (DB), but none evaluated nitric oxide (NO) and advanced glycation end products (AGEs) formation associated with oxidant and antioxidant activities in femoral and coronary arteries from trained diabetic rats. Our hypothesis was that 8-week TR would alter AGEs levels in type 1 diabetic rats ameliorating vascular responsiveness. Methodology/Principal Findings Male Wistar rats were divided into control sedentary (C/SD), sedentary diabetic (SD/DB), and trained diabetic (TR/DB). DB was induced by streptozotocin (i.p.: 60 mg/kg). TR was performed for 60 min per day, 5 days/week, during 8 weeks. Concentration-response curves to acetylcholine (ACh), sodium nitroprusside (SNP), phenylephrine (PHE) and tromboxane analog (U46619) were obtained. The protein expressions of eNOS, receptor for AGEs (RAGE), Cu/Zn-SOD and Mn-SOD were analyzed. Tissues NO production and reactive oxygen species (ROS) generation were evaluated. Plasma nitrate/nitrite (NOx−), superoxide dismutase (SOD), catalase (CAT), thiobarbituric acid reactive substances (TBARS) and Nε-(carboxymethyl) lysine (CML, AGE biomarker). A rightward shift in the concentration-response curves to ACh was observed in femoral and coronary arteries from SD/DB that was accompanied by an increase in TBARS and CML levels. Decreased in the eNOS expression, tissues NO production and NOx− levels were associated with increased ROS generation. A positive interaction between the beneficial effect of TR on the relaxing responses to ACh and the reduction in TBARS and CML levels were observed without changing in antioxidant activities. The eNOS protein expression, tissues NO production and ROS generation were fully re-established in TR/DB, but plasma NOx− levels were partially restored. Conclusion Shear stress induced by TR fully restores the eNOS/NO pathway in both preparations from non-treated diabetic rats, however, a massive production of AGEs still affecting relaxing responses possibly involving other endothelium-dependent vasodilator agents, mainly in coronary artery.
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MESH Headings
- Animals
- Antioxidants/metabolism
- Antioxidants/pharmacology
- Coronary Vessels/drug effects
- Coronary Vessels/metabolism
- Coronary Vessels/physiopathology
- Diabetes Mellitus, Experimental/chemically induced
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/physiopathology
- Diabetes Mellitus, Experimental/therapy
- Dose-Response Relationship, Drug
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/physiopathology
- Endothelium-Dependent Relaxing Factors/metabolism
- Endothelium-Dependent Relaxing Factors/pharmacology
- Femoral Artery/drug effects
- Femoral Artery/metabolism
- Femoral Artery/physiopathology
- Glycation End Products, Advanced/metabolism
- Glycation End Products, Advanced/pharmacology
- Male
- Physical Conditioning, Animal
- Rats
- Rats, Wistar
- Reactive Oxygen Species/metabolism
- Reactive Oxygen Species/pharmacology
- Streptozocin
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Affiliation(s)
- Maria A. Delbin
- Department of Physical Education, Institute of Bioscience, University of São Paulo State (UNESP), Rio Claro, São Paulo, Brazil
| | - Ana Paula C. Davel
- Department of Anatomy, Cellular Biology, Physiology and Biophysics, Institute of Biology, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Gisele Kruger Couto
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo (USP), São Paulo, São Paulo, Brazil
| | - Gustavo G. de Araújo
- Department of Physical Education, Institute of Bioscience, University of São Paulo State (UNESP), Rio Claro, São Paulo, Brazil
| | - Luciana Venturini Rossoni
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo (USP), São Paulo, São Paulo, Brazil
| | - Edson Antunes
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Angelina Zanesco
- Department of Physical Education, Institute of Bioscience, University of São Paulo State (UNESP), Rio Claro, São Paulo, Brazil
- * E-mail:
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Couto GK, Britto LRG, Mill JG, Rossoni LV. Increment in nNOS and Akt‐eNOS pathway in coronary arteries post‐myocardial infarction can prevent the onset of heart failure. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.866.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - José Geraldo Mill
- Physiological ScienceFederal University of Espirito SantoVitoriaBrazil
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Davel AP, Wenceslau CF, Akamine EH, Xavier FE, Couto GK, Oliveira HT, Rossoni LV. Endothelial dysfunction in cardiovascular and endocrine-metabolic diseases: an update. Braz J Med Biol Res 2011; 44:920-32. [PMID: 21956535 DOI: 10.1590/s0100-879x2011007500104] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 08/01/2011] [Indexed: 11/22/2022] Open
Abstract
The endothelium plays a vital role in maintaining circulatory homeostasis by the release of relaxing and contracting factors. Any change in this balance may result in a process known as endothelial dysfunction that leads to impaired control of vascular tone and contributes to the pathogenesis of some cardiovascular and endocrine/metabolic diseases. Reduced endothelium-derived nitric oxide (NO) bioavailability and increased production of thromboxane A2, prostaglandin H2 and superoxide anion in conductance and resistance arteries are commonly associated with endothelial dysfunction in hypertensive, diabetic and obese animals, resulting in reduced endothelium-dependent vasodilatation and in increased vasoconstrictor responses. In addition, recent studies have demonstrated the role of enhanced overactivation of β-adrenergic receptors inducing vascular cytokine production and endothelial NO synthase (eNOS) uncoupling that seem to be the mechanisms underlying endothelial dysfunction in hypertension, heart failure and in endocrine-metabolic disorders. However, some adaptive mechanisms can occur in the initial stages of hypertension, such as increased NO production by eNOS. The present review focuses on the role of NO bioavailability, eNOS uncoupling, cyclooxygenase-derived products and pro-inflammatory factors on the endothelial dysfunction that occurs in hypertension, sympathetic hyperactivity, diabetes mellitus, and obesity. These are cardiovascular and endocrine-metabolic diseases of high incidence and mortality around the world, especially in developing countries and endothelial dysfunction contributes to triggering, maintenance and worsening of these pathological situations.
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Affiliation(s)
- A P Davel
- Departamento de Anatomia, Biologia Celular e Fisiologia e Biofísica, Instituto de Biologia, Universidade Estadual de Campinas, SP, Brasil
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Pacheco BPM, Crajoinas RO, Couto GK, Davel APC, Rossoni LV, Girardi ACC. Dipeptidyl Peptidase IV Inhibition Attenuates Blood Pressure Rising in Young Spontaneously Hypertensive Rats (SHR). FASEB J 2010. [DOI: 10.1096/fasebj.24.1_supplement.982.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Gisele Kruger Couto
- Physiology and Biophysics ‐ Institute of Biomedical SciencesUniversity of Sao PauloSao PauloBrazil
| | - Ana Paula Couto Davel
- Physiology and Biophysics ‐ Institute of Biomedical SciencesUniversity of Sao PauloSao PauloBrazil
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Prezoto BC, Couto GK, Rossoni LV, Schoorlemmer GHM, Carillo BA, Campos RR. Cardioprotective effect of ornitho-kinin in an anesthetized, open-chest chicken model of acute coronary occlusion. Braz J Med Biol Res 2009; 42:824-30. [PMID: 19738988 DOI: 10.1590/s0100-879x2009000900009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2008] [Accepted: 07/17/2009] [Indexed: 11/22/2022] Open
Abstract
The generation of bradykinin (BK; Arg-Pro-Pro-Gly-Phe-Ser-Pro-Phe-Arg) in blood and kallidin (Lys-BK) in tissues by the action of the kallikrein-kinin system has received little attention in non-mammalian vertebrates. In mammals, kallidin can be generated by the coronary endothelium and myocytes in response to ischemia, mediating cardioprotective events. The plasma of birds lacks two key components of the kallikrein-kinin system: the low molecular weight kininogen and a prekallikrein activator analogous to mammalian factor XII, but treatment with bovine plasma kallikrein generates ornitho-kinin [Thr6,Leu8]-BK. The possible cardioprotective effect of ornitho-kinin infusion was investigated in an anesthetized, open-chest chicken model of acute coronary occlusion. A branch of the left main coronary artery was reversibly ligated to produce ischemia followed by reperfusion, after which the degree of myocardial necrosis (infarct size as a percent of area at risk) was assessed by tetrazolium staining. The iv injection of a low dose of ornitho-kinin (4 microg/kg) reduced mean arterial pressure from 88 +/- 12 to 42 +/- 7 mmHg and increased heart rate from 335 +/- 38 to 402 +/- 45 bpm (N = 5). The size of the infarct was reduced by pretreatment with ornitho-kinin (500 microg/kg infused over a period of 5 min) from 35 +/- 3 to 10 +/- 2% of the area at risk. These results suggest that the physiological role of the kallikrein-kinin system is preserved in this animal model in spite of the absence of two key components, i.e., low molecular weight kininogen and factor XII.
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