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Backes A, Collings PJ, Portugal B, Quintero LC, Vahid F, Le Coroller G, Malisoux L, Alkerwi A, Noppe S, Delagardelle C, Beissel J, Chioti A, Stranges S, Schmit JC, Lair ML, D’Incau M, Pastore J, Aguayo GA, Appenzeller B, Couffignal S, Gantenbein M, Devaux Y, Vaillant M, Huiart L, Bejko D, Perquin M, Ruiz M, Ernens I, Fagherazzi G. Associations of movement behaviours and dietary intake with arterial stiffness: results from the ORISCAV-LUX 2 cross-sectional study. BMJ Open 2024; 14:e084933. [PMID: 39067878 PMCID: PMC11287072 DOI: 10.1136/bmjopen-2024-084933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 07/05/2024] [Indexed: 07/30/2024] Open
Abstract
OBJECTIVE Adopting a physically active lifestyle and maintaining a diet rich in antioxidants can reduce the risk of vascular diseases. Arterial stiffness is an early marker for cardiovascular diseases, indicating vascular damage. This study investigates the relationship between physical activity (PA), sedentary behaviour (SB), dietary antioxidant, trace elements intake and vascular health in men and women, with a focus on pulse wave velocity (PWV), the gold standard for assessing arterial stiffness. DESIGN This is a nationwide population-based cross-sectional study (Observation of Cardiovascular Risk Factors in Luxembourg 2 (ORISCAV-LUX 2)). SETTING The study was conducted in Luxembourg, between November 2016 and January 2018. PARTICIPANTS In total, 988 participants from the ORISCAV-LUX 2 study, who were Luxembourg residents, aged 25-79 years, underwent the required physical examination, agreed to wear an accelerometer for 1 week and presented no personal history of myocardial infarction or stroke, were included in the analysis. PRIMARY OUTCOME MEASURE PWV was assessed with the validated Complior instrument. Elastic-net models were used to investigate the associations of dietary intake (antioxidant and trace elements) and movement behaviours (PA and SB) with PWV in men and women. RESULTS The findings reveal diverse associations between PA, SB, dietary intake and PWV, with distinct patterns observed in men and women. In women, a longer median moderate-to-vigorous PA bout length (mean coefficient (β)=-0.039), a higher long-range temporal correlation (higher scaling exponent alpha) at larger time scales (>120 min; β=-1.247) and an increased intake of vitamin C (β=-1.987) and selenium (β=-0.008) were associated with lower PWV. In men, a shorter median SB bout length (β=0.019) and a lower proportion of SB time accumulated in bouts longer than 60 min (β=1.321) were associated with lower PWV. Moreover, a higher daily intake of polyphenols (β=-0.113) and selenium (β=-0.004) was associated with lower PWV in men. CONCLUSION This study underscores the multifaceted nature of the associations between movement behaviours and dietary intake with PWV, as well as sex differences. These findings highlight the significance of considering both movement behaviours and dietary antioxidant intake in cardiovascular health assessments.
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Affiliation(s)
- Anne Backes
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Paul J Collings
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Berta Portugal
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Lilly Carina Quintero
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Farhad Vahid
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Gwenaëlle Le Coroller
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Laurent Malisoux
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
| | - on behalf of the ORISCAV-LUX Study Group
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Ala’a Alkerwi
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Stephanie Noppe
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Charles Delagardelle
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Jean Beissel
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Anna Chioti
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Saverio Stranges
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Jean-Claude Schmit
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Marie-Lise Lair
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Marylène D’Incau
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Jessica Pastore
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Gloria A Aguayo
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Brice Appenzeller
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Sophie Couffignal
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Manon Gantenbein
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Yvan Devaux
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Michel Vaillant
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Laetitia Huiart
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Dritan Bejko
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Magali Perquin
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Maria Ruiz
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Isabelle Ernens
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Guy Fagherazzi
- Department of Precision Health, Luxembourg Institute of Health, Strassen, Luxembourg
- Department of Medical Informatics, Luxembourg Institute of Health, Strassen, Luxembourg
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2
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Thongsepee N, Martviset P, Himakhun W, Chantree P, Sornchuer P, Sangpairoj K, Hiranyachattada S. Cardiovascular Protective Effect of Garcinia dulcis Flower Acetone Extract in 2-Kidney-1-Clip Hypertensive Rats. Adv Pharmacol Pharm Sci 2024; 2024:9916598. [PMID: 38455637 PMCID: PMC10919976 DOI: 10.1155/2024/9916598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 12/25/2023] [Accepted: 02/03/2024] [Indexed: 03/09/2024] Open
Abstract
Morelloflavone and camboginol are bioactive compounds purified from Garcinia dulcis (GD), which has anti-inflammatory and antihypertensive properties. The objective of this study was to examine the cardiovascular protective effect of GD flower acetone extract in 2-kidney-1-clip (2K1C) hypertensive rats. Male Wistar rats underwent 2K1C or sham operation (SO) and were housed for 4 weeks. Each group of rats, then, was further divided into 2 subgroups receiving oral administration of either 50 mg/kg BW GD extract or corn oil (vehicle) daily for 4 weeks. Noninvasive blood pressure (BP) and body weight were measured weekly throughout the study. Subsequently, the invasive measurement of arterial BP and the heart rate were determined in all anesthetized rats. The baroreceptor reflex sensitivity (BRS) was investigated by injection of either phenylephrine or sodium nitroprusside for bradycardia or tachycardia response, respectively. Histological examination of the heart and thoracic aorta was also performed in order to investigate the general morphology and the tumor necrosis factor alpha (TNF-α) expression. We found that the GD flower extract significantly diminished the BP and restored the impaired BRS. Moreover, it also decreased the TNF-α expression in the cardiac muscle and thoracic aorta of 2K1C when compared to the SO group. Taken together, our data showed that GD flower extract exhibits the cardiovascular protective effect in the 2K1C hypertensive rats.
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Affiliation(s)
- Nattaya Thongsepee
- Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
- Thammasat University Research Unit in Nutraceuticals and Food Safety, Thammasat University, Pathum Thani 12120, Thailand
| | - Pongsakorn Martviset
- Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
- Thammasat University Research Unit in Nutraceuticals and Food Safety, Thammasat University, Pathum Thani 12120, Thailand
| | - Wanwisa Himakhun
- Department of Pathology, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
| | - Pathanin Chantree
- Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
- Thammasat University Research Unit in Nutraceuticals and Food Safety, Thammasat University, Pathum Thani 12120, Thailand
| | - Phornphan Sornchuer
- Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
- Thammasat University Research Unit in Nutraceuticals and Food Safety, Thammasat University, Pathum Thani 12120, Thailand
| | - Kant Sangpairoj
- Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathum Thani 12120, Thailand
- Thammasat University Research Unit in Nutraceuticals and Food Safety, Thammasat University, Pathum Thani 12120, Thailand
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3
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Natali LH, Troiano JA, Potje SR, Dias DP, Antoniali C. Pregnancy restores altered sympathetic vasomotor modulation and parasympathetic cardiac modulation in hypertensive rats. Pregnancy Hypertens 2022; 28:180-188. [DOI: 10.1016/j.preghy.2022.05.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 04/27/2022] [Accepted: 05/04/2022] [Indexed: 11/27/2022]
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4
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Borneol reduces sympathetic vasomotor hyperactivity and restores depressed baroreflex sensitivity in rats with renovascular hypertension. Hypertens Res 2022; 45:802-813. [DOI: 10.1038/s41440-022-00868-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 12/28/2021] [Accepted: 01/09/2022] [Indexed: 12/12/2022]
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5
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Amini N, Sarkaki A, Dianat M, Mard SA, Ahangarpour A, Badavi M. Naringin and Trimetazidine Improve Baroreflex Sensitivity and Nucleus Tractus Solitarius Electrical Activity in Renal Ischemia-Reperfusion Injury. Arq Bras Cardiol 2021; 117:290-297. [PMID: 34495221 PMCID: PMC8395798 DOI: 10.36660/abc.20200121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 08/12/2020] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Nucleus tractus solitarius (NTS) is a brain area that plays a key role in kidney and cardiovascular regulation via baroreceptors impulses. OBJECTIVES The aim of this study was to evaluate the effect of naringin (NAR) and trimetazidine (TMZ) alone and their combination on NTS electrical activity and baroreceptor sensitivity (BRS) in renal ischemia- reperfusion (I/R) injury. METHODS Forty male Sprague-Dawley rats (200- 250 g) were allocated into 5 groups with 8 in each. 1) Sham; 2) I/R; 3) TMZ 5 mg/kg; 4) NAR 100 mg/kg; and 5) TMZ5+ NAR100. The left femoral vein was cannulated to infuse saline solution or drug and the BRS was evaluated. I/R was induced by occlusion of renal pedicles for 45 min, followed by 4 hours of reperfusion. The NTS local electroencephalogram (EEG) was recorded before, during ischemia and throughout the reperfusion. Phenylephrine was injected intravenously to evaluate BRS at the end of reperfusion time. The data were analyzed by two-way repeated measurement ANOVA followed by Tukey's post hoc test. A p-value <0.05 was considered significant. RESULTS NTS electrical waves did not change during ischemia time, while they significantly decreased during the entire reperfusion time. NTS electrical activity and BRS dramatically reduced in rats with I/R injury; however, administration of NAR, TMZ alone or their combination significantly improved these changes in rats with I/R injury. CONCLUSIONS The results showed that I/R injury leads to reduced BRS and NTS electrical activity and there may be an association between I/R and decreased BRS. In addition, NAR and TMZ are promising agents to treat I/R complications.
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Affiliation(s)
- Negin Amini
- Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã.,The Persian Gulf Physiology Research Center, Research Institute of Basic Medical Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã
| | - Alireza Sarkaki
- Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã.,The Persian Gulf Physiology Research Center, Research Institute of Basic Medical Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã
| | - Mahin Dianat
- Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã.,The Persian Gulf Physiology Research Center, Research Institute of Basic Medical Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã
| | - Seyyed Ali Mard
- Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã.,The Persian Gulf Physiology Research Center, Research Institute of Basic Medical Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã
| | - Akram Ahangarpour
- Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã.,The Persian Gulf Physiology Research Center, Research Institute of Basic Medical Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã
| | - Mohammad Badavi
- Department of Physiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã.,The Persian Gulf Physiology Research Center, Research Institute of Basic Medical Sciences, Ahvaz Jundishapur University of Medical Sciences, Ahvaz - Irã
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6
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Bezerra LS, Magnani M, Pimentel TC, Freire FMDS, da Silva TAF, Ramalho RC, Alves AF, de Brito Alves JL, de Medeiros IA, Veras RC. Carboxymethyl-glucan from Saccharomyces cerevisiae reduces blood pressure and improves baroreflex sensitivity in spontaneously hypertensive rats. Food Funct 2021; 12:8552-8560. [PMID: 34337642 DOI: 10.1039/d1fo01079d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carboxymethyl-glucan (CMG) is a derivative of β-d-glucan extracted from Sacharomyces cerevisae. This polymer presents improved physicochemical properties and shows health benefits, such as immunomodulation, antioxidant, anti-inflammatory, anti-tumor, and antiplatelet activities, and improved vascular function. However, studies concerning the effect of administration of CMG on the cardiovascular parameters, mainly in the field of hypertension, are scarce. This study aimed to investigate the effect of administration of CMG in spontaneously hypertensive rats (SHR) and normotensive rats (WKY) models. Normotensive and hypertensive animals received CMG at doses of 20 mg kg-1 and 60 mg kg-1 for four weeks. Then, weight gain, lipid profile, renal function, blood pressure, cardiac hypertrophy, baroreflex sensitivity, and sympathetic tone were evaluated. Oral administration of CMG influenced weight gain and cholesterol levels, and significantly reduced urea in the hypertensive animals. It decreased blood pressure levels and cardiac hypertrophy, improved baroreflex response, and reduced the influence of sympathetic tone. The results demonstrate the antihypertensive effect of CMG through improvement in baroreflex sensitivity via sympathetic tone modulation.
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Affiliation(s)
- Lorena Soares Bezerra
- Post-Graduate Program in Nutritional Sciences, Health Sciences Center, Federal University of Paraíba (Universidade Federal da Paraíba - UFPB), Brazil.
| | - Marciane Magnani
- Post-Graduate Program in Nutritional Sciences, Health Sciences Center, Federal University of Paraíba (Universidade Federal da Paraíba - UFPB), Brazil. and Department of Food Engineering, Federal University of Paraíba (UFPB), Brazil
| | | | | | | | | | - Adriano Francisco Alves
- Department of Physiology and Pathology, Laboratory of Pathology, Health Sciences Center, UFPB, Brazil
| | - José Luiz de Brito Alves
- Post-Graduate Program in Nutritional Sciences, Health Sciences Center, Federal University of Paraíba (Universidade Federal da Paraíba - UFPB), Brazil.
| | - Isac Almeida de Medeiros
- Post-Graduate Program in Natural and Synthetic Bioactive Products, Health Sciences Center, UFPB, Brazil
| | - Robson Cavalcante Veras
- Post-Graduate Program in Nutritional Sciences, Health Sciences Center, Federal University of Paraíba (Universidade Federal da Paraíba - UFPB), Brazil. and Department of Pharmaceutical Sciences, Health Sciences Center, UFPB, Brazil
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7
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Wu SJ, Shi ZW, Wang X, Ren FF, Xie ZY, Lei L, Chen P. Activation of the Cholinergic Anti-inflammatory Pathway Attenuated Angiotension II-Dependent Hypertension and Renal Injury. Front Pharmacol 2021; 12:593682. [PMID: 33815099 PMCID: PMC8010129 DOI: 10.3389/fphar.2021.593682] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 02/01/2021] [Indexed: 12/12/2022] Open
Abstract
Background: Angiotensin II (AngII) induces renal fibrosis, characterized by fibroblast proliferation, inflammatory cell infiltration and excessive extracellular matrix deposition, all of which was relevant closely to hypertension. The vagus nerve-related cholinergic anti-inflammatory pathway (CAP) modulates local and systemic inflammatory responses. The aim of present study was to determine the effect of CAP on renal inflammation and fibrosis. Methods and Results: AngII-induced hypertension was induced in vivo by 14-days low-dose AngII infusion from osmotic minipumps. We used GTS-21 dihydrochloride, a selective nicotinic acetylcholine receptor agonist. Daily intraperitoneal GTS-21 injection and/or vagotomy started after hypertension was confirmed and continued for 4 weeks. The elevated blood pressure caused by AngII was significantly attenuated by GTS-21. Improved baroreflex sensitivity was observed after GTS-21 administration. Masson stain and immunoblotting revealed that deposition of excessive fibrosis and overexpression of inflammatory cytokines induced by AngII was reduced by GTS-21. To determine the role of autonomic control in CAP, unilateral vagotomy was performed. Vagotomy weakened the effect of CAP on AngII-induced hypertension. In vitro, GTS-21 suppressed NF-κB activation, attenuated AngII-induced epithelial-mesenchymal transition and reduced inflammation and fibrosis in NRK-52E cells; α-bungarotoxin (α-Bgt, an α7-nAChR selective antagonist) partly inhibited these effects. Conclusion: CAP protected against AngII-induced hypertension via improvement in autonomic control, suppression of NF-κB activation, and reduction of renal fibrosis and inflammatory response.
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Affiliation(s)
- Shu-Jie Wu
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhe-Wei Shi
- Department of Cardiology, Zhuji Affiliated Hospital of Shaoxing University, Zhuji, China
| | - Xue Wang
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Fang-Fang Ren
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zuo-Yi Xie
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Li Lei
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Peng Chen
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
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8
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Novel therapeutics for the treatment of hypertension and its associated complications: peptide- and nonpeptide-based strategies. Hypertens Res 2021; 44:740-755. [PMID: 33731923 PMCID: PMC7967108 DOI: 10.1038/s41440-021-00643-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 12/08/2020] [Accepted: 01/20/2021] [Indexed: 01/31/2023]
Abstract
The renin-angiotensin-aldosterone system (RAAS) is responsible for maintaining blood pressure and vascular tone. Modulation of the RAAS, therefore, interferes with essential cellular processes and leads to high blood pressure, oxidative stress, inflammation, fibrosis, and hypertrophy. Consequently, these conditions cause fatal cardiovascular and renal complications. Thus, the primary purpose of hypertension treatment is to diminish or inhibit overactivated RAAS. Currently available RAAS inhibitors have proven effective in reducing blood pressure; however, beyond hypertension, they have failed to treat end-target organ injury. In addition, RAAS inhibitors have some intolerable adverse effects, such as hyperkalemia and hypotension. These gaps in the available treatment for hypertension require further investigation of the development of safe and effective therapies. Current research is focused on the combination of existing and novel treatments that neutralize the angiotensin II type I (AT1) receptor-mediated action of the angiotensin II peptide. Preclinical studies of peptide- and nonpeptide-based therapeutic agents demonstrate their conspicuous impact on the treatment of cardiovascular diseases in animal models. In this review, we will discuss novel therapeutic agents being developed as RAAS inhibitors that show prominent effects in both preclinical and clinical studies. In addition, we will also highlight the need for improvement in the efficacy of existing drugs in the absence of new prominent antihypertensive drugs.
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9
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Carvalho-Galvão A, Guimarães DD, De Brito Alves JL, Braga VA. Central Inhibition of Tumor Necrosis Factor Alpha Reduces Hypertension by Attenuating Oxidative Stress in the Rostral Ventrolateral Medulla in Renovascular Hypertensive Rats. Front Physiol 2019; 10:491. [PMID: 31114507 PMCID: PMC6502978 DOI: 10.3389/fphys.2019.00491] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 04/08/2019] [Indexed: 12/14/2022] Open
Abstract
Inflammation in the central nervous system is being considered a key player linked to neurogenic hypertension. Using combined in vivo and in vitro approaches, we investigated the effects of central inhibition of TNF-α on blood pressure, sympathetic tone, baroreflex sensitivity, and oxidative stress in the rostral ventrolateral medulla (RVLM) of rats with 2-kidney-1-clip (2K1C) renovascular hypertension. Continuous infusion of pentoxifylline, a TNF-α inhibitor, into the lateral ventricle of the brain for 14 consecutive days reduced blood pressure and improved baroreflex sensitivity in renovascular hypertensive rats. Furthermore, central TNF-α inhibition reduced sympathetic modulation and blunted the increased superoxide accumulation in the RVLM of 2K1C rats. Our findings suggest that TNF-α play an important role in the maintenance of sympathetic vasomotor tone and increased oxidative stress in the RVLM during renovascular hypertension.
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Affiliation(s)
| | - Drielle D Guimarães
- Biotechnology Center, Federal University of Paraíba, João Pessoa, Brazil.,Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden
| | - José L De Brito Alves
- Department of Nutrition, Health Sciences Center, Federal University of Paraíba, João Pessoa, Brazil
| | - Valdir A Braga
- Biotechnology Center, Federal University of Paraíba, João Pessoa, Brazil.,Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden
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10
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Carlström M, Braga VA. Mechanisms underlying the effects of renal denervation in renovascular hypertension. Hypertens Res 2019; 42:754-757. [PMID: 30796370 DOI: 10.1038/s41440-019-0233-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 01/27/2019] [Accepted: 01/28/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Mattias Carlström
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Valdir A Braga
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden. .,Biotechnology Center, Federal University of Paraiba, Joao Pessoa-PB, Brazil.
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11
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Schultz J, Annoni EM, Tolkacheva EG. Modified Sequence Method to Assess Baroreflex Sensitivity in Rats. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2018:2764-2767. [PMID: 30440974 DOI: 10.1109/embc.2018.8512734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Baroreceptors respond to fluctuations in blood pressure (BP) by modifying physiology in order to maintain a homeostatic set point. Baroreflex sensitivity (BRS) is used to quantify baroreceptor function and is a useful metric for tracking cardiovascular disease state and treatment effects. Pathological conditions such as hypertension (HTN) alter baroreflex function and reduce BRS. Traditionally, the sequence method is used to measure BRS, in which the linear slope of concomitant changes in BP and RR intervals are assessed. However, in rats, a high respiratory rate reduces the reliability of the sequence method. Here, we present a modified sequence method that captures BRS at lower frequencies and decreases the variability of the BRS estimate. This method was demonstrated using ECG and BP data from two groups of HTN rats: Sham rats and rats treated with vagus nerve stimulation. The modified sequence method resulted in lower BRS estimates than the traditional sequence technique when applied to the same data sets. Additionally, the modified sequence method resulted in lower BRS estimate variability.
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12
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Carvalho-Galvão A, Gadelha DDA, de Brito Alves JL, Khan BA, Castro-Gomez RJH, Cruz JC, Magnani M, Braga VA. A Newly Isolated Carboxymethyl-Glucan (CM-G) Restores Depressed Baroreflex Sensitivity in Renovascular Hypertensive Rats. Front Physiol 2018; 9:607. [PMID: 29875700 PMCID: PMC5974548 DOI: 10.3389/fphys.2018.00607] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 05/04/2018] [Indexed: 12/26/2022] Open
Abstract
This study was designed to investigate the effects of a newly synthesized carboxymethyl-glucan (CM-G) on blood pressure (BP), baroreflex sensitivity (BRS) and sympathetic vascular modulation in renovascular hypertensive rats. Male Wistar rats were divided into four groups: Sham (n = 10); 2K1C (subjected to renal artery clipping to induce renovascular hypertension, n = 10); Sham + CM-G (treated with CM-G, n = 7) and 2K1C + CM-G (treated with CM-G, n = 7). The daily treatment with CM-G (40 mg/kg) was performed for 2 weeks. Blood pressure, heart rate (HR), systolic BP variability, baroreflex sensitivity (BRS) and sympathetic vascular tone were evaluated. After six weeks of renal artery clipping, 2K1C rats exhibited arterial hypertension (171 ± 11 vs. 118 ± 4 mmHg, p < 0.05), impaired BRS (-1.30 ± 0.10 vs. -2.59 ± 0.17 bpm.mmHg-1, p < 0.05) and enhanced sympathetic activity as shown by the hexamethonium test (-60 ± 5 vs. -33 ± 2 ΔmmHg, p < 0.05) when compared to sham rats. Oral administration of CM-G in renovascular hypertensive rats reduced hypertension (126 ± 4 vs. 171 ± 11 mmHg, p < 0.05) and improved the BRS (-2.03 ± 0.16 vs. -1.30 ± 0.10 bpm.mmHg-1, p < 0.05) in 2K1C rats when compared to placebo. Those effects seem to be caused by a reduction in sympathetic activity. The present study revealed for the first time that CM-G treatment reduces arterial hypertension and restores arterial baroreflex sensitivity via a reduction in the sympathetic tone in conscious renovascular hypertensive rats.
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Affiliation(s)
- Alynne Carvalho-Galvão
- Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil
| | - Danilo D A Gadelha
- Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil
| | - José L de Brito Alves
- Department of Nutrition, Health Sciences Center, Federal University of Paraíba, João Pessoa, Brazil
| | - Barkat A Khan
- Faculty of Pharmacy, Gomal University, Dera Ismail Khan, Pakistan
| | - Raul J H Castro-Gomez
- Department of Foods Engineering, Technology Center, Federal University of Paraíba, João Pessoa, Brazil
| | - Josiane C Cruz
- Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil
| | - Marciane Magnani
- Department of Foods Engineering, Technology Center, Federal University of Paraíba, João Pessoa, Brazil
| | - Valdir A Braga
- Department of Biotechnology, Center of Biotechnology, Federal University of Paraíba, João Pessoa, Brazil
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Figueiredo EAD, Alves NFB, Monteiro MMDO, Cavalcanti CDO, Silva TMSD, Silva TMGD, Braga VDA, Oliveira EDJ. Antioxidant and Antihypertensive Effects of a Chemically Defined Fraction of Syrah Red Wine on Spontaneously Hypertensive Rats. Nutrients 2017; 9:nu9060574. [PMID: 28587200 PMCID: PMC5490553 DOI: 10.3390/nu9060574] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 03/06/2017] [Accepted: 03/07/2017] [Indexed: 12/11/2022] Open
Abstract
A particularly phenolic-rich fraction extracted from red wine from the São Francisco valley (Northeastern Brazil) was chemically characterized and its hypotensive and antioxidant effects on spontaneously hypertensive rats were studied both in vitro and in vivo. The liquid-liquid pH dependent fractionation scheme afforded a fraction with high content of bioactive phenolics such as flavonols, flavonol glycosides, phenolic acids and anthocyanins, whose identities were confirmed by liquid chromatography coupled to mass spectrometry analysis. Pretreatment of spontaneously hypertensive rats with this wine fraction at doses of 50 and 100 mg/kg by gavage for 15 days was able to decrease mean arterial pressure and heart rate as well as decrease serum lipid peroxidation. The fraction at concentrations of 0.01–1000 µg/mL induced concentration-dependent relaxation of isolated rat superior mesenteric artery rings pre-contracted with phenylephrine and this effect was not attenuated by endothelium removal. Our results demonstrate it is possible for phenolic constituents of red wine that are orally bioavailable to exert in vivo hypotensive and antioxidant effects on intact endothelial function.
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Affiliation(s)
- Eugênia Abrantes de Figueiredo
- Centro de Biotecnologia, Programa de Pós Graduação em Produtos Naturais e Sintéticos Bioativos, Campus I, João Pessoa, PB 58051-970, Brazil.
| | - Naiane Ferraz Bandeira Alves
- Centro de Biotecnologia, Programa de Pós Graduação em Produtos Naturais e Sintéticos Bioativos, Campus I, João Pessoa, PB 58051-970, Brazil.
| | - Matheus Morais de Oliveira Monteiro
- Centro de Biotecnologia, Programa de Pós Graduação em Produtos Naturais e Sintéticos Bioativos, Campus I, João Pessoa, PB 58051-970, Brazil.
| | - Clenia de Oliveira Cavalcanti
- Centro de Biotecnologia, Programa de Pós Graduação em Produtos Naturais e Sintéticos Bioativos, Campus I, João Pessoa, PB 58051-970, Brazil.
| | - Tania Maria Sarmento da Silva
- Departamento de Química, Laboratório de Bioprospecção Fitoquímica, Universidade Federal Rural de Pernambuco, Recife, PE 52171-900, Brazil.
| | - Telma Maria Guedes da Silva
- Departamento de Química, Laboratório de Bioprospecção Fitoquímica, Universidade Federal Rural de Pernambuco, Recife, PE 52171-900, Brazil.
| | - Valdir de Andrade Braga
- Centro de Biotecnologia, Programa de Pós Graduação em Produtos Naturais e Sintéticos Bioativos, Campus I, João Pessoa, PB 58051-970, Brazil.
| | - Eduardo de Jesus Oliveira
- Departamento de Farmácia, Universidade Federal dos Vales do Jequitinhonha e Mucurí, Diamantina, MG, 39100-000, Brazil.
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14
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Mesquita TRR, de Jesus ICG, Dos Santos JF, de Almeida GKM, de Vasconcelos CML, Guatimosim S, Macedo FN, Dos Santos RV, de Menezes-Filho JER, Miguel-Dos-Santos R, Matos PTD, Scalzo S, Santana-Filho VJ, Albuquerque-Júnior RLC, Pereira-Filho RN, Lauton-Santos S. Cardioprotective Action of Ginkgo biloba Extract against Sustained β-Adrenergic Stimulation Occurs via Activation of M 2/NO Pathway. Front Pharmacol 2017; 8:220. [PMID: 28553225 PMCID: PMC5426084 DOI: 10.3389/fphar.2017.00220] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 04/10/2017] [Indexed: 01/08/2023] Open
Abstract
Ginkgo biloba is the most popular phytotherapic agent used worldwide for treatment of several human disorders. However, the mechanisms involved in the protective actions of Ginkgo biloba on cardiovascular diseases remain poorly elucidated. Taking into account recent studies showing beneficial actions of cholinergic signaling in the heart and the cholinergic hypothesis of Ginkgo biloba-mediated neuroprotection, we aimed to investigate whether Ginkgo biloba extract (GBE) promotes cardioprotection via activation of cholinergic signaling in a model of isoproterenol-induced cardiac hypertrophy. Here, we show that GBE treatment (100 mg/kg/day for 8 days, v.o.) reestablished the autonomic imbalance and baroreflex dysfunction caused by chronic β-adrenergic receptor stimulation (β-AR, 4.5 mg/kg/day for 8 days, i.p.). Moreover, GBE prevented the upregulation of muscarinic receptors (M2) and downregulation of β1-AR in isoproterenol treated-hearts. Additionally, we demonstrated that GBE prevents the impaired endothelial nitric oxide synthase activity in the heart. GBE also prevented the pathological cardiac remodeling, electrocardiographic changes and impaired left ventricular contractility that are typical of cardiac hypertrophy. To further investigate the mechanisms involved in GBE cardioprotection in vivo, we performed in vitro studies. By using neonatal cardiomyocyte culture we demonstrated that the antihypertrophic action of GBE was fully abolished by muscarinic receptor antagonist or NOS inhibition. Altogether, our data support the notion that antihypertrophic effect of GBE occurs via activation of M2/NO pathway uncovering a new mechanism involved in the cardioprotective action of Ginkgo biloba.
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Affiliation(s)
| | - Itamar C G de Jesus
- Departments of Physiology and Biophysics, Federal University of Minas GeraisBelo Horizonte, Brazil
| | | | | | | | - Silvia Guatimosim
- Departments of Physiology and Biophysics, Federal University of Minas GeraisBelo Horizonte, Brazil
| | - Fabrício N Macedo
- Department of Physiology, Federal University of SergipeSão Cristóvão, Brazil
| | | | | | | | - Paulo T D Matos
- Department of Physiology, Federal University of SergipeSão Cristóvão, Brazil
| | - Sérgio Scalzo
- Departments of Physiology and Biophysics, Federal University of Minas GeraisBelo Horizonte, Brazil
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15
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Sangartit W, Pakdeechote P, Kukongviriyapan V, Donpunha W, Shibahara S, Kukongviriyapan U. Tetrahydrocurcumin in combination with deferiprone attenuates hypertension, vascular dysfunction, baroreflex dysfunction, and oxidative stress in iron-overloaded mice. Vascul Pharmacol 2016; 87:199-208. [DOI: 10.1016/j.vph.2016.10.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 10/01/2016] [Accepted: 10/01/2016] [Indexed: 12/13/2022]
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16
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Panth N, Paudel KR, Parajuli K. Reactive Oxygen Species: A Key Hallmark of Cardiovascular Disease. Adv Med 2016; 2016:9152732. [PMID: 27774507 PMCID: PMC5059509 DOI: 10.1155/2016/9152732] [Citation(s) in RCA: 218] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 08/11/2016] [Accepted: 08/24/2016] [Indexed: 02/07/2023] Open
Abstract
Cardiovascular diseases (CVDs) have been the prime cause of mortality worldwide for decades. However, the underlying mechanism of their pathogenesis is not fully clear yet. It has been already established that reactive oxygen species (ROS) play a vital role in the progression of CVDs. ROS are chemically unstable reactive free radicals containing oxygen, normally produced by xanthine oxidase, nicotinamide adenine dinucleotide phosphate oxidase, lipoxygenases, or mitochondria or due to the uncoupling of nitric oxide synthase in vascular cells. When the equilibrium between production of free radicals and antioxidant capacity of human physiology gets altered due to several pathophysiological conditions, oxidative stress is induced, which in turn leads to tissue injury. This review focuses on pathways behind the production of ROS, its involvement in various intracellular signaling cascades leading to several cardiovascular disorders (endothelial dysfunction, ischemia-reperfusion, and atherosclerosis), methods for its detection, and therapeutic strategies for treatment of CVDs targeting the sources of ROS. The information generated by this review aims to provide updated insights into the understanding of the mechanisms behind cardiovascular complications mediated by ROS.
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Affiliation(s)
- Nisha Panth
- Department of Pharmacy, School of Health and Allied Sciences, Pokhara University, Dhungepatan, Kaski 33701, Nepal
| | - Keshav Raj Paudel
- Department of Pharmacy, School of Health and Allied Sciences, Pokhara University, Dhungepatan, Kaski 33701, Nepal
| | - Kalpana Parajuli
- Department of Pharmacy, School of Health and Allied Sciences, Pokhara University, Dhungepatan, Kaski 33701, Nepal
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17
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Beckhauser TF, Francis-Oliveira J, De Pasquale R. Reactive Oxygen Species: Physiological and Physiopathological Effects on Synaptic Plasticity. J Exp Neurosci 2016; 10:23-48. [PMID: 27625575 PMCID: PMC5012454 DOI: 10.4137/jen.s39887] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 08/09/2016] [Accepted: 08/13/2016] [Indexed: 12/18/2022] Open
Abstract
In the mammalian central nervous system, reactive oxygen species (ROS) generation is counterbalanced by antioxidant defenses. When large amounts of ROS accumulate, antioxidant mechanisms become overwhelmed and oxidative cellular stress may occur. Therefore, ROS are typically characterized as toxic molecules, oxidizing membrane lipids, changing the conformation of proteins, damaging nucleic acids, and causing deficits in synaptic plasticity. High ROS concentrations are associated with a decline in cognitive functions, as observed in some neurodegenerative disorders and age-dependent decay of neuroplasticity. Nevertheless, controlled ROS production provides the optimal redox state for the activation of transductional pathways involved in synaptic changes. Since ROS may regulate neuronal activity and elicit negative effects at the same time, the distinction between beneficial and deleterious consequences is unclear. In this regard, this review assesses current research and describes the main sources of ROS in neurons, specifying their involvement in synaptic plasticity and distinguishing between physiological and pathological processes implicated.
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Affiliation(s)
- Thiago Fernando Beckhauser
- Physiology and Biophysics Department, Biomedical Sciences Institute, Sao Paulo University (USP), Butanta, Sao Paulo, Brazil
| | - José Francis-Oliveira
- Physiology and Biophysics Department, Biomedical Sciences Institute, Sao Paulo University (USP), Butanta, Sao Paulo, Brazil
| | - Roberto De Pasquale
- Physiology and Biophysics Department, Biomedical Sciences Institute, Sao Paulo University (USP), Butanta, Sao Paulo, Brazil
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18
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Mengal V, Silva PH, Tiradentes RV, Santuzzi CH, de Almeida SA, Sena GC, Bissoli NS, Abreu GR, Gouvea SA. Aliskiren and l-arginine treatments restore depressed baroreflex sensitivity and decrease oxidative stress in renovascular hypertension rats. Hypertens Res 2016; 39:769-776. [PMID: 27383506 DOI: 10.1038/hr.2016.61] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 04/18/2016] [Accepted: 05/11/2016] [Indexed: 02/07/2023]
Abstract
Renovascular hypertension is characterized by increased angiotensin II and oxidative stress, and by endothelial dysfunction. The purpose of this study was to test whether the administration of aliskiren (ALSK) and l-arginine (l-ARG) would restore impaired baroreflex sensitivity and reduce oxidative stress in a rat renovascular hypertension model. Hypertension was induced by clipping the left renal artery, and the following five groups were created: SHAM; two-kidney, 1-clip (2K1C); 2K1C plus ALSK (ALSK); 2K1C plus l-ARG (l-ARG); and 2K1C plus ALSK+l-ARG (ALSK+l-ARG). After 21 days of treatment, only the ALSK+l-ARG group was effective in normalizing the arterial pressure (108.8±2.8 mm Hg). The l-ARG and ALSK+l-ARG groups did not show hypertrophy of the left ventricle. All the treatments restored the depressed baroreflex sensitivity to values found in the SHAM group. Acute administration of TEMPOL restored the depressed baroreflex sensitivity in the 2K1C group to values that resembled those presented by the other groups. All treatments were effective for an increase in the antioxidant pathway and reduction in the oxidative pathway. In conclusion, the treatment with ALSK or l-ARG reduced oxidative stress and restored reduced baroreflex sensitivity in renovascular hypertension. In addition, the treatments were able to normalize blood pressure and reverse left ventricular hypertrophy when used in combination.
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Affiliation(s)
- Vinicius Mengal
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Paulo Hm Silva
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Renata V Tiradentes
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Cintia H Santuzzi
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Simone A de Almeida
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Gabriela C Sena
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Nazare S Bissoli
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Glaucia R Abreu
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
| | - Sonia A Gouvea
- Department of Physiological Sciences, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil.,Nucleus of Biotechnology, Health Sciences Center, Federal University of Espírito Santo, Vitória, Brazil
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19
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Low-level Chronic Lead Exposure Impairs Neural Control of Blood Pressure and Heart Rate in Rats. Cardiovasc Toxicol 2016; 17:190-199. [DOI: 10.1007/s12012-016-9374-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Cavalcanti CDO, Alves RR, de Oliveira AL, Cruz JDC, de França-Silva MDS, Braga VDA, Balarini CDM. Inhibition of PDE5 Restores Depressed Baroreflex Sensitivity in Renovascular Hypertensive Rats. Front Physiol 2016; 7:15. [PMID: 26858657 PMCID: PMC4729906 DOI: 10.3389/fphys.2016.00015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2015] [Accepted: 01/11/2016] [Indexed: 01/05/2023] Open
Abstract
Renal artery stenosis is frequently associated with resistant hypertension, which is defined as failure to normalize blood pressure (BP) even when combined drugs are used. Inhibition of PDE5 by sildenafil has been shown to increase endothelial function and decrease blood pressure in experimental models. However, no available study evaluated the baroreflex sensitivity nor autonomic balance in renovascular hypertensive rats treated with sildenafil. In a translational medicine perspective, our hypothesis is that sildenafil could improve autonomic imbalance and baroreflex sensitivity, contributing to lower blood pressure. Renovascular hypertensive 2-kidney-1-clip (2K1C) and sham rats were treated with sildenafil (45 mg/Kg/day) during 7 days. At the end of treatment, BP and heart rate (HR) were recorded in conscious rats after a 24-h-recovery period. Spontaneous and drug-induced baroreflex sensitivity and autonomic tone were evaluated; in addition, lipid peroxidation was measured in plasma samples. Treatment was efficient in increasing both spontaneous and induced baroreflex sensitivity in treated hypertensive animals. Inhibition of PDE5 was also capable of ameliorating autonomic imbalance in 2K1C rats and decreasing systemic oxidative stress. Taken together, these beneficial effects resulted in significant reductions in BP without affecting HR. We suggest that sildenafil could be considered as a promising alternative to treat resistant hypertension.
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Affiliation(s)
| | - Rafael R Alves
- Centro de Ciências Médicas, Universidade Federal da ParaíbaJoao Pessoa, Brazil; Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoao Pessoa, Brazil
| | - Alessandro L de Oliveira
- Centro de Ciências Médicas, Universidade Federal da ParaíbaJoao Pessoa, Brazil; Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoao Pessoa, Brazil
| | | | | | | | - Camille de Moura Balarini
- Centro de Biotecnologia, Universidade Federal da ParaíbaJoao Pessoa, Brazil; Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoao Pessoa, Brazil
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21
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Cruz JC, Flôr AFL, França-Silva MS, Balarini CM, Braga VA. Reactive Oxygen Species in the Paraventricular Nucleus of the Hypothalamus Alter Sympathetic Activity During Metabolic Syndrome. Front Physiol 2015; 6:384. [PMID: 26779026 PMCID: PMC4688401 DOI: 10.3389/fphys.2015.00384] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Accepted: 11/27/2015] [Indexed: 12/31/2022] Open
Abstract
The paraventricular nucleus of the hypothalamus (PVN) contains heterogeneous populations of neurons involved in autonomic and neuroendocrine regulation. The PVN plays an important role in the sympathoexcitatory response to increasing circulating levels of angiotensin II (Ang-II), which activates AT1 receptors in the circumventricular organs (OCVs), mainly in the subfornical organ (SFO). Circulating Ang-II induces a de novo synthesis of Ang-II in SFO neurons projecting to pre-autonomic PVN neurons. Activation of AT1 receptors induces intracellular increases in reactive oxygen species (ROS), leading to increases in sympathetic nerve activity (SNA). Chronic sympathetic nerve activation promotes a series of metabolic disorders that characterizes the metabolic syndrome (MetS): dyslipidemia, hyperinsulinemia, glucose intolerance, hyperleptinemia and elevated plasma hormone levels, such as noradrenaline, glucocorticoids, leptin, insulin, and Ang-II. This review will discuss the contribution of our laboratory and others regarding the sympathoexcitation caused by peripheral Ang-II-induced reactive oxygen species along the subfornical organ and paraventricular nucleus of the hypothalamus. We hypothesize that this mechanism could be involved in metabolic disorders underlying MetS.
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Affiliation(s)
- Josiane C Cruz
- Centro de Biotecnologia, Universidade Federal da Paraíba João Pessoa, Brazil
| | - Atalia F L Flôr
- Centro de Biotecnologia, Universidade Federal da Paraíba João Pessoa, Brazil
| | | | - Camille M Balarini
- Centro de Biotecnologia, Universidade Federal da ParaíbaJoão Pessoa, Brazil; Centro de Ciências da Saúde, Universidade Federal da ParaíbaJoão Pessoa, Brazil
| | - Valdir A Braga
- Centro de Biotecnologia, Universidade Federal da Paraíba João Pessoa, Brazil
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22
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Santilli F, D'Ardes D, Davì G. Oxidative stress in chronic vascular disease: From prediction to prevention. Vascul Pharmacol 2015; 74:23-37. [DOI: 10.1016/j.vph.2015.09.003] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 09/04/2015] [Accepted: 09/08/2015] [Indexed: 12/14/2022]
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23
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de Queiroz TM, Xia H, Filipeanu CM, Braga VA, Lazartigues E. α-Lipoic acid reduces neurogenic hypertension by blunting oxidative stress-mediated increase in ADAM17. Am J Physiol Heart Circ Physiol 2015; 309:H926-34. [PMID: 26254330 PMCID: PMC4591409 DOI: 10.1152/ajpheart.00259.2015] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 07/30/2015] [Indexed: 02/07/2023]
Abstract
We previously reported that type 2 angiotensin-converting enzyme (ACE2) compensatory activity is impaired by the disintegrin and metalloprotease 17 (ADAM17), and lack of ACE2 is associated with oxidative stress in neurogenic hypertension. To investigate the relationship between ADAM17 and oxidative stress, Neuro2A cells were treated with ANG II (100 nM) 24 h after vehicle or α-lipoic acid (LA, 500 μM). ADAM17 expression was increased by ANG II (120.5 ± 9.1 vs. 100.2 ± 0.8%, P < 0.05) and decreased after LA (69.0 ± 0.3 vs. 120.5 ± 9.1%, P < 0.05). In another set of experiments, LA reduced ADAM17 (92.9 ± 5.3 vs. 100.0 ± 11.2%, P < 0.05) following its overexpression. Moreover, ADAM17 activity was reduced by LA in ADAM17-overexpressing cells [109.5 ± 19.8 vs. 158.0 ± 20.0 fluorescence units (FU)·min(-1)·μg protein(-1), P < 0.05], in which ADAM17 overexpression increased oxidative stress (114.1 ± 2.5 vs. 101.0 ± 1.0%, P < 0.05). Conversely, LA-treated cells attenuated ADAM17 overexpression-induced oxidative stress (76.0 ± 9.1 vs. 114.1 ± 2.5%, P < 0.05). In deoxycorticosterone acetate (DOCA)-salt hypertensive mice, a model in which ADAM17 expression and activity are increased, hypertension was blunted by pretreatment with LA (119.0 ± 2.4 vs. 131.4 ± 2.2 mmHg, P < 0.05). In addition, LA improved dysautonomia and baroreflex sensitivity. Furthermore, LA blunted the increase in NADPH oxidase subunit expression, as well as the increase in ADAM17 and decrease in ACE2 activity in the hypothalamus of DOCA-salt hypertensive mice. Taken together, these data suggest that LA might preserve ACE2 compensatory activity by breaking the feedforward cycle between ADAM17 and oxidative stress, resulting in a reduction of neurogenic hypertension.
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Affiliation(s)
- Thyago M de Queiroz
- Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, New Orleans, Louisiana; Department of Biotechnology, Federal University of Paraíba, João Pessoa, PB, Brazil
| | - Huijing Xia
- Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, New Orleans, Louisiana; Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana; and
| | - Catalin M Filipeanu
- Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, New Orleans, Louisiana; Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana; and
| | - Valdir A Braga
- Department of Biotechnology, Federal University of Paraíba, João Pessoa, PB, Brazil
| | - Eric Lazartigues
- Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, New Orleans, Louisiana; Neurosciences Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana; Cardiovascular Center of Excellence, Louisiana State University Health Sciences Center, New Orleans, Louisiana; and
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24
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Mendes-Júnior LDG, Guimarães DD, Gadelha DDA, Diniz TF, Brandão MCR, Athayde-Filho PF, Lemos VS, França-Silva MDS, Braga VA. The new nitric oxide donor cyclohexane nitrate induces vasorelaxation, hypotension, and antihypertensive effects via NO/cGMP/PKG pathway. Front Physiol 2015; 6:243. [PMID: 26379557 PMCID: PMC4553900 DOI: 10.3389/fphys.2015.00243] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 08/13/2015] [Indexed: 12/19/2022] Open
Abstract
We investigated the cardiovascular effects induced by the nitric oxide donor Cyclohexane Nitrate (HEX). Vasodilatation, NO release and the effects of acute or sub-chronic treatment with HEX on cardiovascular parameters were evaluated. HEX induced endothelium-independent vasodilatation (Maximum effect [efficacy, ME] = 100.4 ± 4.1%; potency [pD2] = 5.1 ± 0.1). Relaxation was attenuated by scavenging nitric oxide (ME = 44.9 ± 9.4% vs. 100.4 ± 4.1%) or by inhibiting the soluble guanylyl cyclase (ME = 38.5 ± 9.7% vs. 100.4 ± 4.1%). In addition, pD2 was decreased after non-selective blockade of K+ channels (pD2 = 3.6 ± 0.1 vs. 5.1 ± 0.1) or by inhibiting KATP channels (pD2 = 4.3 ± 0.1 vs. 5.1 ± 0.1). HEX increased NO levels in mesenteric arteries (33.2 ± 2.3 vs. 10.7 ± 0.2 au, p < 0.0001). Intravenous acute administration of HEX (1–20 mg/kg) induced hypotension and bradycardia in normotensive and hypertensive rats. Furthermore, starting at 6 weeks after the induction of 2K1C hypertension, oral treatment with the HEX (10 mg/Kg/day) for 7 days reduced blood pressure in hypertensive animals (134 ± 6 vs. 170 ± 4 mmHg, respectively). Our data demonstrate that HEX is a NO donor able to produce vasodilatation via NO/cGMP/PKG pathway and activation of the ATP-sensitive K+ channels. Furthermore, HEX acutely reduces blood pressure and heart rate as well as produces antihypertensive effect in renovascular hypertensive rats.
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Affiliation(s)
| | | | | | - Thiago F Diniz
- Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais Belo Horizonte, Brazil
| | - Maria C R Brandão
- Department of Chemistry, Federal University of Paraíba João Pessoa, Brazil
| | | | - Virginia S Lemos
- Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais Belo Horizonte, Brazil
| | | | - Valdir A Braga
- Biotechnology Center, Federal University of Paraíba João Pessoa, Brazil
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Siti HN, Kamisah Y, Kamsiah J. The role of oxidative stress, antioxidants and vascular inflammation in cardiovascular disease (a review). Vascul Pharmacol 2015; 71:40-56. [PMID: 25869516 DOI: 10.1016/j.vph.2015.03.005] [Citation(s) in RCA: 579] [Impact Index Per Article: 64.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 02/28/2015] [Accepted: 03/09/2015] [Indexed: 12/31/2022]
Abstract
The concept of mild chronic vascular inflammation as part of the pathophysiology of cardiovascular disease, most importantly hypertension and atherosclerosis, has been well accepted. Indeed there are links between vascular inflammation, endothelial dysfunction and oxidative stress. However, there are still gaps in our understanding regarding this matter that might be the cause behind disappointing results of antioxidant therapy for cardiovascular risk factors in large-scale long-term randomised controlled trials. Apart from the limitations of our knowledge, limitations in methodology and assessment of the body's endogenous and exogenous oxidant-antioxidant status are a serious handicap. The pleiotropic effects of antioxidant and anti-inflammation that are shown by some well-established antihypertensive agents and statins partly support the idea of using antioxidants in vascular diseases as still relevant. This review aims to provide an overview of the links between oxidative stress, vascular inflammation, endothelial dysfunction and cardiovascular risk factors, importantly focusing on blood pressure regulation and atherosclerosis. In view of the potential benefits of antioxidants, this review will also examine the proposed role of vitamin C, vitamin E and polyphenols in cardiovascular diseases as well as the success or failure of antioxidant therapy for cardiovascular diseases in clinical trials.
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Affiliation(s)
- Hawa N Siti
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia; Department of Basic Medical Sciences, Faculty of Medicine, Universiti Sultan Zainal Abidin, Terengganu, Malaysia
| | - Y Kamisah
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - J Kamsiah
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia.
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26
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Alves NFB, Porpino SKP, Monteiro MMO, Gomes ERM, Braga VA. Coconut oil supplementation and physical exercise improves baroreflex sensitivity and oxidative stress in hypertensive rats. Appl Physiol Nutr Metab 2015; 40:393-400. [PMID: 25659569 DOI: 10.1139/apnm-2014-0351] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The hypothesis that oral supplementation with virgin coconut oil (Cocos nucifera L.) and exercise training would improve impaired baroreflex sensitivity (BRS) and reduce oxidative stress in spontaneously hypertensive rats (SHR) was tested. Adult male SHR and Wistar Kyoto rats (WKY) were divided into 5 groups: WKY + saline (n = 8); SHR + saline (n = 8); SHR + coconut oil (2 mL·day(-1), n = 8); SHR + trained (n = 8); and SHR + trained + coconut oil (n = 8). Mean arterial pressure (MAP) was recorded and BRS was tested using phenylephrine (8 μg/kg, intravenous) and sodium nitroprusside (25 μg·kg(-1), intravenous). Oxidative stress was measured using dihydroethidium in heart and aorta. SHR + saline, SHR + coconut oil, and SHR + trained group showed higher MAP compared with WKY + saline (175 ± 6, 148 ± 6, 147 ± 7 vs. 113 ± 2 mm Hg; p < 0.05). SHR + coconut oil, SHR + trained group, and SHR + trained + coconut oil groups presented lower MAP compared with SHR + saline group (148 ± 6, 147 ± 7, 134 ± 8 vs. 175 ± 6 mm Hg; p < 0.05). Coconut oil combined with exercise training improved BRS in SHR compared with SHR + saline group (-2.47 ± 0.3 vs. -1.39 ± 0.09 beats·min(-1)·mm Hg(-1); p < 0.05). SHR + saline group showed higher superoxide levels when compared with WKY + saline (774 ± 31 vs. 634 ± 19 arbitrary units (AU), respectively; p < 0.05). SHR + trained + coconut oil group presented reduced oxidative stress compared with SHR + saline in heart (622 ± 16 vs. 774 ± 31 AU, p < 0.05). In aorta, coconut oil reduced oxidative stress in SHR compared with SHR + saline group (454 ± 33 vs. 689 ± 29 AU, p < 0.05). Oral supplementation with coconut oil combined with exercise training improved impaired BRS and reduced oxidative stress in SHR.
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Affiliation(s)
- Naiane F B Alves
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil
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27
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Zhang L, Li F, Zhi G, Zhang B, Chen YD. NADPH oxidase contributes to the left ventricular dysfunction induced by sinoaortic denervation in rats. Free Radic Res 2014; 49:57-66. [PMID: 25356862 DOI: 10.3109/10715762.2014.978768] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The aim of this work was to investigate the role nicotinamide adenine dinucleotide phosphate (NADPH) oxidase on left ventricular dysfunction of rats submitted to sinoaortic denervation (SAD). Experiment 1: 8 weeks after SAD of rats, NADPH oxidase in left ventricles was assayed by Western blotting analysis. Experiment 2: Rats were subjected to SAD and received treatment with apocynin (an NADPH oxidase inhibitor, 30 mg/kg/day, intragastric administration) for 8 weeks; 8 weeks after SAD, Nox2 and Nox4 expressions and Rac1 activity of left ventricles were higher in SAD rats than those in sham-operated rats. Although treatment of SAD rats with apocynin did not affect blood pressure, blood pressure variability (BPV), and baroreflex function, it significantly attenuated left ventricular hypertrophy marked by reduced expression of atrial natriuretic factor and β-myosin heavy chain. Treatment of SAD rats with apocynin abated oxidative stress marked by reduced malondialdehyde formation and suppressed nuclear factor-kappa B (NFκB) activation; inflammation marked by reduced monocyte chemoattractant protein-1 expression and myeloperoxidase activity; attenuated endoplasmic reticulum stress marked by reduced expression of CCAAT-enhancer-binding protein homologous protein, chaperone-glucose-regulated protein 78, and X-box protein 1; and alleviated cardiac fibrosis marked by reduced mRNA levels of collagens I and III and transforming growth factor beta. In conclusion, exaggerated BPV induces chronic myocardial oxidative stress and thereby aggravates cardiac remodeling in rats. These data suggest a potential role of NADPH oxidases in the pathogenesis of cardiac dysfunction induced by exaggerated BPV.
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Affiliation(s)
- L Zhang
- First Geriatric Cardiology Department, Chinese PLA General Hospital , Beijing , P. R. China
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28
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Chu CP, Cui BR, Kannan H, Qiu DL. Alterations in the baroreceptor-heart rate reflex in conscious inbred polydipsic (STR/N) mice. Physiol Res 2014; 64:173-82. [PMID: 25317689 DOI: 10.33549/physiolres.932820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
STR/N is an inbred strain of mice which is known to exhibit extreme polydipsia and polyuria. We previously found central administration of angiotensin II enhanced cardiovascular responses in STR/N mice than normal mice, suggesting that STR/N mice might exhibit different cardiovascular responses. Therefore, in this study, we investigated daily mean arterial blood pressure and heart rate, and changes in the baroreceptor-heart rate reflex in conscious STR/N mice and control (ICR) mice. We found that variability in daily mean arterial blood pressure and heart rate was significantly larger in STR/N mice than in ICR mice (p<0.05). There was a stronger response to phenylephrine (PE) in STR/N mice than in ICR mice. For baroreceptor reflex sensitivity, in the rapid response period, the slopes of PE and sodium nitroprusside (SNP) were more negative in STR/N mice than in ICR mice. In the later period, the slopes of PE and SNP were negatively correlated between heart rate and blood pressure in ICR mice, but their slopes were positively correlated in STR/N mice. These results indicated that STR/N mice exhibited the different cardiovascular responses than ICR mice, suggesting that the dysfunction of baroreceptor reflex happened in conscious STR/N mice.
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Affiliation(s)
- C P Chu
- Cellular Function Research Center, Yanbian University, Yanji City, Jilin Province, China. ;
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29
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Dantas BPV, Ribeiro TP, Assis VL, Furtado FF, Assis KS, Alves JS, Silva TM, Camara CA, França-Silva MS, Veras RC, Medeiros IA, Alencar JL, Braga VA. Vasorelaxation induced by a new naphthoquinone-oxime is mediated by NO-sGC-cGMP pathway. Molecules 2014; 19:9773-85. [PMID: 25006785 PMCID: PMC6270866 DOI: 10.3390/molecules19079773] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 06/21/2014] [Accepted: 06/23/2014] [Indexed: 11/16/2022] Open
Abstract
It has been established that oximes cause endothelium-independent relaxation in blood vessels. In the present study, the cardiovascular effects of the new oxime 3-hydroxy-4–(hydroxyimino)-2-(3-methylbut-2-enylnaphtalen-1(4H)-one (OximeS1) derived from lapachol were evaluated. In normotensive rats, administration of Oxime S1 (10, 15, 20 and 30 mg/Kg, i.v.) produced dose-dependent reduction in blood pressure. In isolated aorta and superior mesenteric artery rings, Oxime S1 induced endothelium-independent and concentration-dependent relaxations (10−8 M to 10−4 M). In addition, Oxime S1-induced vasorelaxations were attenuated by hydroxocobalamin or methylene blue in aorta and by PTIO or ODQ in mesenteric artery rings, suggesting a role for the nitric oxide (NO) pathway. Additionally, Oxime S1 (30 and 100 µM) significantly increased NO concentrations (13.9 ± 1.6 nM and 17.9 ± 4.1 nM, respectively) measured by nitric oxide microsensors. Furthermore, pre-contraction with KCl (80 mM) prevented Oxime S1-derived vasorelaxation in endothelium-denuded aortic rings. Of note, combined treatment with potassium channel inhibitors also reduced Oxime S1-mediated vasorelaxation suggesting a role for potassium channels, more precisely Kir, Kv and KATP channels. We observed the involvement of BKCa channels in Oxime S1-induced relaxation in mesenteric artery rings. In conclusion, these data suggest that the Oxime S1 induces hypotension and vasorelaxation via NO pathway by activating soluble guanylate cyclase (sGC) and K+ channels.
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Affiliation(s)
- Bruna P. V. Dantas
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Thaís P. Ribeiro
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Valéria L. Assis
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Fabíola F. Furtado
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Kívia S. Assis
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Jeziane S. Alves
- Molecular Sciences Department, Federal Rural University of Pernambuco, Recife, PE 52171-900, Brazil; E-Mails: (J.S.A.); (T.M.S.S.); (C.A.C.)
| | - Tania M.S. Silva
- Molecular Sciences Department, Federal Rural University of Pernambuco, Recife, PE 52171-900, Brazil; E-Mails: (J.S.A.); (T.M.S.S.); (C.A.C.)
| | - Celso A. Camara
- Molecular Sciences Department, Federal Rural University of Pernambuco, Recife, PE 52171-900, Brazil; E-Mails: (J.S.A.); (T.M.S.S.); (C.A.C.)
| | - Maria S. França-Silva
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Robson C. Veras
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Isac A. Medeiros
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Jacicarlos L. Alencar
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
| | - Valdir A. Braga
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58.051-900, Brazil; E-Mails: (B.P.V.D.); (T.P.R); (V.L.A.); (F.F.F.); (K.S.A.); (M.S.F.-S.); (R.C.V.); (I.A.M.); (J.L.A.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +55-083-3216-7173; Fax: +55-083-3216-7511
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30
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Queiroz TM, Mendes-Júnior LG, Guimarães DD, França-Silva MS, Nalivaiko E, Braga VA. Cardiorespiratory effects induced by 2-nitrate-1,3-dibuthoxypropan are reduced by nitric oxide scavenger in rats. Auton Neurosci 2013; 181:31-6. [PMID: 24418115 DOI: 10.1016/j.autneu.2013.12.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 12/13/2013] [Accepted: 12/17/2013] [Indexed: 11/26/2022]
Abstract
The search for new nitric oxide donors is warranted by the limitations of organic nitrates currently used in cardiology. The new organic nitrate 2-nitrate-1,3-dibuthoxypropan (NDBP) exhibited promising cardiovascular activities in previous studies. The aim of this study was to investigate the cardiorespiratory responses evoked by NDBP and to compare them to the clinically used organic nitrate nitroglycerine (NTG). Arterial pressure, heart rate and respiration were recorded in conscious adult male Wistar rats. Bolus i.v. injection of NDBP (1 to 15mg/kg; n=8) and NTG (0.1 to 5mg/kg; n=8) produced hypotension. NDBP induced bradycardia at all doses, while NTG induced tachycardia at three lower doses but bradycardia at higher doses. Hydroxocobalamin (20mg/kg; HDX), a NO scavenger, blunted hypotension induced by NDBP (15mg/kg), and its bradycardic effect (n=6). In addition, HDX blunted both hypotension and bradycardia induced by a single dose of NTG (2.5mg/kg; n=6). Both NDBP and NTG altered respiratory rate, inducing a biphasic effect with a bradypnea followed by a tachypnea; HDX attenuated these responses. Our data indicate that NDBP and NTG induce hypotension, bradycardia and bradypnea, which are mediated by nitric oxide release.
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Affiliation(s)
- Thyago M Queiroz
- Biotechnology Center, Federal University of Paraiba, João Pessoa, PB, Brazil
| | | | - Drielle D Guimarães
- Biotechnology Center, Federal University of Paraiba, João Pessoa, PB, Brazil
| | | | - Eugene Nalivaiko
- School of Biomedical Sciences and Pharmacy, University of Newcastle, NSW, Australia.
| | - Valdir A Braga
- Biotechnology Center, Federal University of Paraiba, João Pessoa, PB, Brazil
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de Queiroz TM, Monteiro MMO, Braga VA. Angiotensin-II-derived reactive oxygen species on baroreflex sensitivity during hypertension: new perspectives. Front Physiol 2013; 4:105. [PMID: 23717285 PMCID: PMC3651964 DOI: 10.3389/fphys.2013.00105] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 04/24/2013] [Indexed: 12/12/2022] Open
Abstract
Hypertension is a multifactorial disorder, which has been associated with the reduction in baroreflex sensitivity (BRS) and autonomic dysfunction. Several studies have revealed that increased reactive oxygen species (ROS) generated by nicotinamide adenine dinucleotide phosphate [NAD(P)H] oxidase, following activation of type 1 receptor (AT1R) by Angiotensin-(Ang) II, the main peptide of the Renin–Angiotensin–Aldosterone System (RAAS), is the central mechanism involved in Ang-II-derived hypertension. In the present review, we will discuss the role of Ang II and oxidative stress in hypertension, the relationship between the BRS and the genesis of hypertension and how the oxidative stress triggers baroreflex dysfunction in several models of hypertension. Finally, we will describe some novel therapeutic drugs for improving the BRS during hypertension.
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Affiliation(s)
- Thyago M de Queiroz
- Department of Biotechnology, Biotechnology Center, Federal University of Paraiba João Pessoa, Brazil
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Mendes-Junior LDG, Monteiro MMDO, Carvalho ADS, de Queiroz TM, Braga VDA. Oral supplementation with the rutin improves cardiovagal baroreflex sensitivity and vascular reactivity in hypertensive rats. Appl Physiol Nutr Metab 2013; 38:1099-106. [PMID: 24053516 DOI: 10.1139/apnm-2013-0091] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The hypothesis that oral supplementation with the flavonoid rutin improves baroreflex sensitivity and vascular reactivity in hypertensive (2-kidney-1-clip (2K1C)) rats was tested. Sixty-four rats were divided in 4 groups: sham + saline; sham + rutin; 2K1C + saline, and 2K1C + rutin. Six weeks after 2K1C surgery, the animals were treated with saline or rutin (40 mg·kg(-1)·day(-1)) by gavage for 7 days. Baroreflex sensitivity test using phenylephrine (8 μg·kg(-1), iv) and sodium nitroprusside (25 μg·kg(-1), iv), vascular reactivity, and thiobarbituric acid reactive substances assay were performed. Baroreflex sensitivity in hypertensive rats was impaired and compared with sham (-2.77 ± 0.15 vs. -1.53 ± 0.27 beats·min(-1)·mm Hg(-1); n = 8; p < 0.05). Oral supplementation with rutin restored baroreflex sensitivity in 2K1C rats (-2.40 ± 0.24 vs. -2.77 ± 0.15 beats·min(-1)·mm Hg(-1); n = 8; p > 0.05). Besides, hypertensive rats have greater contraction to phenylephrine (129.49% ± 4.46% vs. 99.50% ± 11.36%; n = 8; p < 0.05), which was restored by rutin (99.10% ± 1.77% vs. 99.50% ± 11.36%; n = 8; p > 0.05). Furthermore, vasorelaxation to acetylcholine was diminished in hypertensive rats (96.42% ± 2.80% vs. 119.35% ± 5.60%; n = 8; p < 0.05), which was also restored by rutin (117.55% ± 6.94% vs. 119.35% ± 5.60%; n = 8; p > 0.05). Finally, oxidative stress was greater in hypertensive rats (1.54 ± 0.12 vs. 0.53 ± 0.12 nmol MDA·mL(-1); n = 8; p < 0.05) and rutin supplementation significantly decreased oxidative stress in those animals (0.70 ± 0.13 vs. 1.54 ± 0.12 nmol MDA·mL(-1); n = 8; p < 0.05). We concluded that oral supplementation with rutin restores impaired baroreflex sensitivity and vascular reactivity in hypertensive rats by decreasing oxidative stress.
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Guimarães DD, Carvalho CC, Braga VA. Scavenging of NADPH oxidase-derived superoxide anions improves depressed baroreflex sensitivity in spontaneously hypertensive rats. Clin Exp Pharmacol Physiol 2012; 39:373-8. [PMID: 22283703 DOI: 10.1111/j.1440-1681.2012.05679.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In pathological conditions, such as hypertension, there is impairment in the autonomic control of blood pressure resulting in changes in baroreflex sensitivity. In the present study we tested the hypothesis that acute superoxide scavenging would restore the depressed baroreflex sensitivity (BRS) in spontaneously hypertensive rats (SHR). Male 10-week-old SHR (n = 14) and their controls (Wistar-Kyoto (WKY) rats; n = 14) underwent femoral artery and vein catheterization for conscious blood pressure recording and drug administration. The BRS was obtained by the drug-induced method using phenylephrine (8 μg/kg, i.v.) and sodium nitroprusside (25 μg/kg, i.v.) before and after the administration of tiron (30 mg/kg, i.v.), a superoxide dismutase mimetic, or apocynin (30 μg/kg), an NADPH oxidase inhibitor. Spontaneously hypertensive rats was significantly hypertensive compared with WKY rats (160 ± 7 vs 105 ± 2 mmHg, respectively). However, there was no significant difference in heart rate between the two groups (388 ± 10 vs 370 ± 20 b.p.m.). In addition, SHR exhibited a diminished BRS compared with WKY rats (-1.34 ± 0.11 vs -2.91 ± 0.20 b.p.m./mmHg, respectively). Administration of tiron improved BRS in SHR (from -1.34 ± 0.11 to 2.26 ± 0.21 b.p.m./mmHg), as did apocynin (to -2.14 ± 0.23 b.p.m./mmHg). Serum samples from SHR (n = 20) and WKY rats (n = 20) were collected for thiobarbituric acid-reactive substances assays before and after tiron or apocynin to confirm the reduction in oxidative stress. There was considerably greater oxidative stress in SHR compared with WKY rats (36.2 ± 3.0 vs 13.3 ± 2.6 nmol/L, respectively). Both apocynin and tiron treatment reduced the oxidative stress in SHR (from 36.2 ± 3.0 to 21.5 ± 3.0 nmol/L and from 37.2 ± 3.9 to 21.9 ± 1.6 nmol/L, respectively). The data suggest that acute scavenging of NADPH oxidase-derived superoxide improves baroreflex sensitivity in SHR.
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Affiliation(s)
- D D Guimarães
- Biotechnology Center, Federal University of Paraíba, João Pessoa, Brazil
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α-lipoic acid reduces hypertension and increases baroreflex sensitivity in renovascular hypertensive rats. Molecules 2012; 17:13357-67. [PMID: 23143148 PMCID: PMC6268197 DOI: 10.3390/molecules171113357] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 10/26/2012] [Accepted: 10/31/2012] [Indexed: 02/07/2023] Open
Abstract
Renovascular hypertension has robust effects on control of blood pressure, including an impairment in baroreflex mechanisms, which involves oxidative stress. Although α-lipoic acid (LA) has been described as a potent antioxidant, its effect on renovascular hypertension and baroreflex sensitivity (BRS) has not been investigated. In the present study we analyzed the effects caused by chronic treatment with LA on blood pressure, heart rate and baroreflex sensitivity (sympathetic and parasympathetic components) in renovascular hypertensive rats. Male Wistar rats underwent 2-Kidney-1-Clip (2K1C) or sham surgery and were maintained untouched for four weeks to develop hypertension. Four weeks post-surgery, rats were treated with LA (60 mg/kg) or saline for 14 days orally. On the 15th day mean arterial pressure (MAP) and heart rate (HR) were recorded. In addition, baroreflex sensitivity test using phenylephrine (8 µg/kg, i.v.) and sodium nitroprusside (25 µg/kg, i.v.) was performed. Chronic treatment with LA decreased blood pressure in hypertensive animals; however, no significant changes in baseline HR were observed. Regarding baroreflex, LA treatment increased the sensitivity of both the sympathetic and parasympathetic components. All parameters studied were not affected by treatment with LA in normotensive animals. Our data suggest that chronic treatment with LA promotes antihypertensive effect and improves baroreflex sensitivity in rats with renovascular hypertension.
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Monteiro MMO, França-Silva MS, Alves NFB, Porpino SKP, Braga VA. Quercetin improves baroreflex sensitivity in spontaneously hypertensive rats. Molecules 2012; 17:12997-3008. [PMID: 23117438 PMCID: PMC6269113 DOI: 10.3390/molecules171112997] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 10/26/2012] [Accepted: 10/31/2012] [Indexed: 02/07/2023] Open
Abstract
Quercetin is a well-known antioxidant. Here, we investigated the effects of treatment with quercetin on mean arterial pressure (MAP), heart rate (HR) and baroreflex sensitivity (BRS) in spontaneously hypertensive rats (SHR). SHR and their controls (WKY) were orally treated with quercetin (2, 10 or 25 mg/kg/day) or saline for seven days. On the 8th day, MAP and HR were recorded. BRS was tested using phenylephrine (8 mg/kg, i.v.) and sodium nitroprusside (25 mg/kg, i.v.). Oxidative stress was measured by tiobarbituric acid reactive species assay. The doses of 10 (n = 8) and 25 mg/kg (n = 8) were able to decrease the MAP in SHR (n = 9) (163 ± 4 and 156 ± 5 vs. 173 ± 6, respectively, p < 0.05) but not in WKY (117 ± 1 and 118 ± 2 vs. 113 ± 1, respectively, p < 0.05). The dose of 25 mg/kg/day increased the sensitivity of parasympathetic component of the baroreflex (−2.47 ± 0.31 vs. −1.25 ± 0.8 bpm/mmHg) and decreased serum oxidative stress in SHR (2.04 ± 0.17 vs. 3.22 ± 0.37 nmol/mL, n = 6). Our data suggest that treatment with quercetin reduces hypertension and improves BRS in SHR via reduction in oxidative stress.
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Angiotensin II-derived reactive oxygen species underpinning the processing of the cardiovascular reflexes in the medulla oblongata. Neurosci Bull 2011; 27:269-74. [PMID: 21788998 DOI: 10.1007/s12264-011-1529-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The brainstem is a major site in the central nervous system involved in the processing of the cardiovascular reflexes such as the baroreflex and the peripheral chemoreflex. The nucleus tractus solitarius and the rostral ventrolateral medulla are 2 important brainstem nuclei, and they play pivotal roles in autonomic cardiovascular regulation. Angiotensin II is one of the neurotransmitters involved in the processing of the cardiovascular reflexes within the brainstem. It is well-known that one of the mechanisms by which angiotensin II exerts its effect is via the activation of pathways that generate reactive oxygen species (ROS). In the central nervous system, ROS are reported to be involved in several pathological diseases such as hypertension, heart failure and sleep apnea. However, little is known about the role of ROS in the processing of the cardiovascular reflexes within the brainstem. The present review mainly discussed some recent findings documenting a role for ROS in the processing of the baroreflex and the peripheral chemoreflex in the brainstem.
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Braga VA, Medeiros IA, Ribeiro TP, França-Silva MS, Botelho-Ono MS, Guimarães DD. Angiotensin-II-induced reactive oxygen species along the SFO-PVN-RVLM pathway: implications in neurogenic hypertension. Braz J Med Biol Res 2011; 44:871-6. [PMID: 21755262 DOI: 10.1590/s0100-879x2011007500088] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Accepted: 06/16/2011] [Indexed: 02/07/2023] Open
Abstract
Neurogenic hypertension has been the subject of extensive research worldwide. This review is based on the premise that some forms of neurogenic hypertension are caused in part by the formation of angiotensin-II (Ang-II)-induced reactive oxygen species along the subfornical organ-paraventricular nucleus of the hypothalamus-rostral ventrolateral medulla pathway (SFO-PVN-RVLM pathway). We will discuss the recent contribution of our laboratory and others regarding the mechanisms by which neurons in the SFO (an important circumventricular organ) are activated by Ang-II, how the SFO communicates with two other important areas involved in sympathetic activity regulation (PVN and RVLM) and how Ang-II-induced reactive oxygen species participate along the SFO-PVN-RVLM pathway in the pathogenesis of neurogenic hypertension.
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Affiliation(s)
- V A Braga
- Laboratório de Tecnologia Farmacêutica, Universidade Federal da Paraíba, João Pessoa, PB, Brasil.
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Giusti MF, Sato MA, Cardoso LM, Braga VA, Colombari E. Central antioxidant therapy inhibits parasympathetic baroreflex control in conscious rats. Neurosci Lett 2011; 489:115-8. [DOI: 10.1016/j.neulet.2010.11.077] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Revised: 11/30/2010] [Accepted: 11/30/2010] [Indexed: 02/07/2023]
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Burmeister MA, Young CN, Braga VA, Butler SD, Sharma RV, Davisson RL. In vivo bioluminescence imaging reveals redox-regulated activator protein-1 activation in paraventricular nucleus of mice with renovascular hypertension. Hypertension 2010; 57:289-97. [PMID: 21173341 DOI: 10.1161/hypertensionaha.110.160564] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Renovascular hypertension in mice is characterized by an elevation in hypothalamic angiotensin II levels. The paraventricular nucleus (PVN) is a major cardioregulatory site implicated in the neurogenic component of renovascular hypertension. Increased superoxide (O(2)(-·)) production in the PVN is involved in angiotensin II-dependent neurocardiovascular diseases such as hypertension and heart failure. Here, we tested the hypothesis that excessive O(2)(-·) production and activation of the redox-regulated transcription factor activator protein-1 (AP-1) in PVN contributes to the development and maintenance of renovascular hypertension. Male C57BL/6 mice underwent implantation of radiotelemeters, bilateral PVN injections of an adenovirus (Ad) encoding superoxide dismutase (AdCuZnSOD) or a control gene (LacZ), and unilateral renal artery clipping (2-kidney, one-clip [2K1C]) or sham surgery. AP-1 activity was longitudinally monitored in vivo by bioluminescence imaging in 2K1C or sham mice that had undergone PVN-targeted microinjections of an Ad encoding the firefly luciferase (Luc) gene downstream of AP-1 response elements (AdAP-1Luc). 2K1C evoked chronic hypertension and an increase in O(2)(-·) production in the PVN. Viral delivery of CuZnSOD to the PVN not only prevented the elevation in O(2)(-·) but also abolished renovascular hypertension. 2K1C also caused a surge in AP-1 activity in the PVN, which paralleled the rise in O(2)(-·) production in this brain region, and this was prevented by treatment with AdCuZnSOD. Finally, Ad-mediated expression of a dominant-negative inhibitor of AP-1 activity in the PVN prevented 2K1C-evoked hypertension. These results implicate oxidant signaling and AP-1 transcriptional activity in the PVN as key mediators in the pathogenesis of renovascular hypertension.
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Affiliation(s)
- Melissa A Burmeister
- Biomedical Sciences, College of Veterinary Medicine, Weill Cornell Medical College, Cornell University, Ithaca, NY 14853-6401, USA
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