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Moraes RA, Brito DS, Araujo FA, Jesus RLC, Silva LB, Sá DS, Silva da Silva CD, Pernomian L, Wenceslau CF, Priviero F, Webb RC, Silva DF. NONO2P, a novel nitric oxide donor, causes vasorelaxation through NO/sGC/PKG pathway, K + channels opening and SERCA activation. Eur J Pharmacol 2024; 979:176822. [PMID: 39047965 DOI: 10.1016/j.ejphar.2024.176822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 07/01/2024] [Accepted: 07/17/2024] [Indexed: 07/27/2024]
Abstract
BACKGROUND & AIMS The treatment of cardiovascular diseases (CVD) could greatly benefit from using nitric oxide (NO) donors. This study aimed to investigate the mechanisms of action of NONO2P that contribute to the observed responses in the mesenteric artery. The hypothesis was that NONO2P would have similar pharmacological actions to sodium nitroprusside (SNP) and NO. METHODS Male Wistar rats were euthanized to isolate the superior mesenteric artery for isometric tension recordings. NO levels were measured using the DAF-FM/DA dye, and cyclic guanosine monophosphate (cGMP) levels were determined using a cGMP-ELISA Kit. RESULTS NONO2P presented a similar maximum efficacy to SNP. The free radical of NO (NO•) scavengers (PTIO; 100 μM and hydroxocobalamin; 30 μM) and nitroxyl anion (NO-) scavenger (L-cysteine; 3 mM) decreased relaxations promoted by NONO2P. The presence of the specific soluble guanylyl cyclase (sGC) inhibitor (ODQ; 10 μM) nearly abolished the vasorelaxation. The cGMP-dependent protein kinase (PKG) inhibition (KT5823; 1 μM) attenuated the NONO2P relaxant effect. The vasorelaxant response was significantly attenuated by blocking inward rectifying K+ channels (Kir), voltage-operated K+ channels (KV), and large conductance Ca2+-activated K+ channels (BKCa). NONO2P-induced relaxation was attenuated by cyclopiazonic acid (10 μM), indicating that sarcoplasmic reticulum Ca2+-ATPase (SERCA) activation is involved in this relaxation. Moreover, NONO2P increased NO levels in endothelial cells and cGMP production. CONCLUSIONS NONO2P induces vasorelaxation with the same magnitude as SNP, releasing NO• and NO-. Its vasorelaxant effect involves sGC, PKG, K+ channels opening, and SERCA activation, suggesting its potential as a therapeutic option for CVD.
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Affiliation(s)
- Raiana A Moraes
- Laboratory of Cardiovascular Physiology and Pharmacology, Bioregulation Department, Federal University of Bahia, UFBA, Salvador, Bahia, Brazil; Gonçalo Moniz Institute, FIOCRUZ, Salvador, BA, Brazil
| | - Daniele S Brito
- Laboratory of Cardiovascular Physiology and Pharmacology, Bioregulation Department, Federal University of Bahia, UFBA, Salvador, Bahia, Brazil; Gonçalo Moniz Institute, FIOCRUZ, Salvador, BA, Brazil
| | - Fênix A Araujo
- Laboratory of Cardiovascular Physiology and Pharmacology, Bioregulation Department, Federal University of Bahia, UFBA, Salvador, Bahia, Brazil; Gonçalo Moniz Institute, FIOCRUZ, Salvador, BA, Brazil
| | - Rafael L C Jesus
- Laboratory of Cardiovascular Physiology and Pharmacology, Bioregulation Department, Federal University of Bahia, UFBA, Salvador, Bahia, Brazil
| | - Liliane B Silva
- Laboratory of Cardiovascular Physiology and Pharmacology, Bioregulation Department, Federal University of Bahia, UFBA, Salvador, Bahia, Brazil
| | - Denise S Sá
- Federal Institute of Bahia, IFBA, Salvador, BA, Brazil
| | | | - Laena Pernomian
- Department of Cell Biology and Anatomy, University of South Carolina, Columbia, SC, USA; Cardiovascular Translational Research Center, University of South Carolina, Columbia, SC, USA
| | - Camilla F Wenceslau
- Department of Cell Biology and Anatomy, University of South Carolina, Columbia, SC, USA; Cardiovascular Translational Research Center, University of South Carolina, Columbia, SC, USA
| | - Fernanda Priviero
- Department of Cell Biology and Anatomy, University of South Carolina, Columbia, SC, USA; Cardiovascular Translational Research Center, University of South Carolina, Columbia, SC, USA
| | - R Clinton Webb
- Department of Cell Biology and Anatomy, University of South Carolina, Columbia, SC, USA; Cardiovascular Translational Research Center, University of South Carolina, Columbia, SC, USA
| | - Darizy F Silva
- Laboratory of Cardiovascular Physiology and Pharmacology, Bioregulation Department, Federal University of Bahia, UFBA, Salvador, Bahia, Brazil; Gonçalo Moniz Institute, FIOCRUZ, Salvador, BA, Brazil.
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Bhowmik R, Roy M. Recent advances on the development of NO-releasing molecules (NORMs) for biomedical applications. Eur J Med Chem 2024; 268:116217. [PMID: 38367491 DOI: 10.1016/j.ejmech.2024.116217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/02/2024] [Accepted: 02/02/2024] [Indexed: 02/19/2024]
Abstract
Nitric oxide (NO) is an important biological messenger as well as a signaling molecule that participates in a broad range of physiological events and therapeutic applications in biological systems. However, due to its very short half-life in physiological conditions, its therapeutic applications are restricted. Efforts have been made to develop an enormous number of NO-releasing molecules (NORMs) and motifs for NO delivery to the target tissues. These NORMs involve organic nitrate, nitrite, nitro compounds, transition metal nitrosyls, and several nanomaterials. The controlled release of NO from these NORMs to the specific site requires several external stimuli like light, sound, pH, heat, enzyme, etc. Herein, we have provided a comprehensive review of the biochemistry of nitric oxide, recent advancements in NO-releasing materials with the appropriate stimuli of NO release, and their biomedical applications in cancer and other disease control.
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Affiliation(s)
- Rintu Bhowmik
- Department of Chemistry, National Institute of Technology Manipur, Langol, 795004, Imphal West, Manipur, India
| | - Mithun Roy
- Department of Chemistry, National Institute of Technology Manipur, Langol, 795004, Imphal West, Manipur, India.
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Cavalcanti ALDM, Rocha PKL, Zhuge Z, Paulo LL, Mendes-Júnior LDG, Brandão MCR, Athayde-Filho PF, Lundberg JO, Weitzberg E, Carlström M, Braga VDA, Montenegro MF. Cardiovascular characterization of the novel organic mononitrate NDIBP in rats. Nitric Oxide 2022; 119:50-60. [PMID: 34958954 DOI: 10.1016/j.niox.2021.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 12/18/2021] [Accepted: 12/21/2021] [Indexed: 11/17/2022]
Abstract
Organic nitrates are widely used to restore endogenous nitric oxide (NO) levels reduced by endothelial nitric oxide synthase dysfunction. However, these drugs are associated with undesirable side effects, including tolerance. This study aims to investigate the cardiovascular effects of the new organic nitrate 1,3-diisobutoxypropan-2-yl nitrate (NDIBP). Specifically, we assessed its effects on blood pressure, vascular reactivity, acute toxicity, and the ability to induce tolerance. In vitro and ex vivo techniques showed that NDIBP released NO both in a cell-free system and in isolated mesenteric arteries preparations through a process catalyzed by xanthine oxidoreductase. NDIBP also evoked endothelium-independent vasorelaxation, which was significantly attenuated by 2-phenyl-4,4,5,5,-tetramethylimidazoline-1-oxyl 3-oxide (PTIO, 300 μM), a nitric oxide scavenger; 1-H-[1,2,4] oxadiazolo-[4,3-a]quinoxalin-1-one (ODQ, 10 μM), a soluble guanylyl cyclase inhibitor; tetraethylammonium (TEA, 3 mM), a potassium channel blocker; febuxostat (500 nM), a xanthine oxidase inhibitor; and proadifen (10 μM), an inhibitor of cytochrome P450 enzyme. Furthermore, this organic nitrate did not induce tolerance in isolated vessels and presented low toxicity following acute oral administration. In vivo changes on cardiovascular parameters were assessed using normotensive and renovascular hypertensive rats. NDIBP evoked a reduction of blood pressure that was significantly higher in hypertensive animals. Our results suggest that NDIBP acts as a NO donor, inducing blood pressure reduction without having the undesirable effects of tolerance. Those effects seem to be mediated by activation of NO-sGC-cGMP pathway and positive modulation of K+ channels in vascular smooth muscle.
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Affiliation(s)
| | - Patrícia Keytth Lins Rocha
- Biotechnology Center, Federal University of Paraíba, Cidade Universitária, 58051970, João Pessoa, PB, Brazil
| | - Zhengbing Zhuge
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 65, Stockholm, Sweden
| | - Luciano Leite Paulo
- Biotechnology Center, Federal University of Paraíba, Cidade Universitária, 58051970, João Pessoa, PB, Brazil
| | | | | | - Petrônio F Athayde-Filho
- Department of Chemistry, Federal University of Paraíba, Cidade Universitária, 58059900, João Pessoa, PB, Brazil
| | - Jon O Lundberg
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 65, Stockholm, Sweden
| | - Eddie Weitzberg
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 65, Stockholm, Sweden
| | - Mattias Carlström
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 65, Stockholm, Sweden
| | - Valdir de Andrade Braga
- Biotechnology Center, Federal University of Paraíba, Cidade Universitária, 58051970, João Pessoa, PB, Brazil.
| | - Marcelo F Montenegro
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 65, Stockholm, Sweden
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Younis W, Schini-Kerth VB, Junior AG, Nocchi SR, Silva DB, Roberts RE. Endothelium-independent vasorelaxant effect of Asphodelus tenuifolius Cav. via inhibition of myosin light chain kinase activity in the porcine coronary artery. JOURNAL OF ETHNOPHARMACOLOGY 2021; 269:113693. [PMID: 33326818 DOI: 10.1016/j.jep.2020.113693] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 04/11/2020] [Accepted: 12/09/2020] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Asphodelus tenuifolius Cav. (Asphodelaceae), a wild, terrestrial, annual stemless herb, is widely used in traditional medicine for the treatment of hypertension, diabetes, atherosclerosis and circulatory problems. A previous research study from our laboratory revealed that A. tenuifolius has beneficial effects in reducing blood pressure and improves aortic endothelial dysfunction in chronically glucose fed rats. Despite the fact that A. tenuifolius reduces blood pressure and improves endothelial function in vivo, there are no detailed studies about its possible mechanism of action. AIM OF THE STUDY This study was designed to provide pharmacological basis and mechanism of action for the traditional use of A. tenuifolius in hypertension and circulatory problems. We explored the vasorelaxant effect of A. tenuifolius and its underlying vasorelaxation mechanism in porcine coronary artery rings. MATERIALS AND METHODS Aqueous methanolic crude extract of A. tenuifolius was prepared by maceration process and then activity guided fractionation was carried out by using different polarity based solvents. Phytochemical studies were carried out using LC-DAD-MS. Segments of porcine distal coronary artery were set up in a wire myograph for isometric force measurements. Extract/fractions of A. tenuifolius seeds were tested for vasodilator activity by measurement of changes in tone after pre-contraction with the thromboxane mimetic U46619 in the presence or absence of inhibitors of intracellular signaling cascades. RESULTS Crude extract/fractions of A. tenuifolius produced dose dependent endothelium independent vasorelaxant response in coronary rings, whereas, the butanol fraction of A. tenuifolius (BS-AT) produced the largest relaxation response with 100% relaxation at 1 mg/ml, therefore the mechanism of relaxation of this fraction was determined. The relaxation to BS-AT was unaffected by removal of the endothelium, pre-contraction with KCl, or the presence of the non-selective potassium channel blocker tetraethylammonium, indicating that the relaxation was endothelium-independent, and does not involve activation of potassium channels. BS-AT (1 mg/ml) inhibited the contractile response to calcium,the L-type calcium channel activator BAY K8664,and ionomycin, indicating that it inhibits calcium-induced contractions. The relaxation response to BS-AT was attenuated in the absence of extracellular calcium. However, relaxations to BS-AT were also reduced after deletion of calcium from intracellular stores with cyclopiazonic acid. Incubation with 1 mg/ml BS-AT also inhibited phosphorylation of myosin light chains in homogenates of coronary artery. CONCLUSION The butanol extract of Asphodelus tenuifolius produces a large endothelium-independent relaxation of the porcine coronary artery through inhibition of calcium-induced contractions. The effect appears to be downstream of calcium influx, possibly through inhibition of myosin light chain kinase. This study supports previous studies demonstrating that A. tenuifolius reduces blood pressure. Future studies will aim to determine the active compounds underlying this response.
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Affiliation(s)
- Waqas Younis
- Laboratory of Cardiovascular Research and Integrative Pharmacology, College of Pharmacy, University of Sargodha, Sargodha, 40100, Pakistan; Pharmacology Research Group, School of Life Sciences, University of Nottingham Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, United Kingdom
| | - V B Schini-Kerth
- UMR 1260 INSERM Nanomédecine Régénérative Faculté de Pharmacie, Université de Strasbourg, Illkirch, France
| | - Arquimedes Gasparotto Junior
- Laboratory of Electrophysiology and Cardiovascular Pharmacology, Federal University of Grande Dourados (UFGD), P.O. Box 533, 79.804-970, Dourados, MS, Brazil
| | - Samara Requena Nocchi
- Laboratório de Produtos Naturais e Espectrometria de Massas (LaPNEM), Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição (FACFAN), Universidade Federal do Mato Grosso do Sul, Campo Grande, MS, Brazil
| | - Denise Brentan Silva
- Laboratório de Produtos Naturais e Espectrometria de Massas (LaPNEM), Faculdade de Ciências Farmacêuticas, Alimentos e Nutrição (FACFAN), Universidade Federal do Mato Grosso do Sul, Campo Grande, MS, Brazil
| | - Richard E Roberts
- Pharmacology Research Group, School of Life Sciences, University of Nottingham Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, United Kingdom.
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The new organic nitrate 2-nitrate-1,3-diocthanoxypropan (NDOP) induces nitric oxide production and vasorelaxation via activation of inward-rectifier potassium channels (K IR). Nitric Oxide 2020; 104-105:61-69. [PMID: 33038483 DOI: 10.1016/j.niox.2020.10.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 08/27/2020] [Accepted: 10/01/2020] [Indexed: 11/20/2022]
Abstract
INTRODUCTION Cardiovascular diseases are coupled to decreased nitric oxide (NO) bioavailability, and there is a constant search for novel and better NO-donors. Here we synthesized and characterized the cardiovascular effects of the new organic nitrate 2-nitrate-1,3-dioctanoxypropan (NDOP). METHODS A combination of in vitro and in vivo experiments was performed in C57BL/6 mice and Wistar rats. Thus, the ability of NDOP in donating NO in a cell-free system and in vascular smooth muscles cells (VSMC) and its ability to induce vasorelaxation in aortic rings from mice were evaluated. In addition, changes in blood pressure and heart rate to different doses of NDOP were evaluated in conscious rats. Finally, acute pre-clinical toxicity to oral administration of NDOP was assessed in mice. RESULTS In cell-free system, NDOP increased NO levels, which was dependent on xanthine oxidoreductase (XOR). NDOP also increased NO levels in VSMC, which was not influenced by endothelial NO synthase. Furthermore, incubation with the XOR inhibitor febuxostat blunted the vasorelaxation in aortic ring preparations. In conscious rats, NDOP elicited dose-dependent reduction in blood pressure accompanied with increased heart rate. In vessel preparations, NDOP (10-8-10-3 mol/L) induced endothelium-independent vasorelaxation, which was inhibited by the NO scavengers 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide and hydroxocobalamin or by inhibition of soluble guanylyl cyclase using H- [1,2,4] oxadiazolo [4,3-a]quinoxalin-1-one. To investigate if NDOP acts through potassium channels, selective blockers were used. Inhibition of BKCa, Kv or KATP subtypes of potassium channels had no effect, but inhibition of inward-rectifier potassium channels (KIR) significantly reduced NDOP-mediated vasorelaxation. Lastly, NDOP showed low toxicity (LD50 ~5000 mg/kg). CONCLUSION Bioactivation of NDOP involves functional XOR, and this new organic nitrate elicits vasorelaxation via NO-cGMP-PKG signaling and activation of KIR channels. Future studies should further characterize the underlying mechanism and evaluate the therapeutic benefits of chronic NDOP treatment in relevant cardiovascular disease models.
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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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Trindade NR, Lopes PR, Naves LM, Fajemiroye JO, Alves PH, Amaral NO, Lião LM, Rebelo ACS, Castro CH, Braga VA, Menegatti R, Pedrino GR. The Newly Synthesized Pyrazole Derivative 5-(1-(3 Fluorophenyl)-1 H-Pyrazol-4-yl)-2 H-Tetrazole Reduces Blood Pressure of Spontaneously Hypertensive Rats via NO/cGMO Pathway. Front Physiol 2018; 9:1073. [PMID: 30131720 PMCID: PMC6091002 DOI: 10.3389/fphys.2018.01073] [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: 04/27/2018] [Accepted: 07/17/2018] [Indexed: 01/13/2023] Open
Abstract
The search for new antihypertensive drugs has grown in recent years because of high rate of morbidity among hypertensive patients and several side effects that are associated with the first-line medications. The current study sought to investigate the antihypertensive effect of a newly synthesized pyrazole derivative known as 5-(1-(3 fluorophenyl)-1H-pyrazol-4-yl)-2H-tetrazole (LQFM-21). Spontaneously hypertensive rats (SHR) were used to evaluate the effect of LQFM-21 on mean arterial pressure (MAP), heart rate (HR), renal vascular conductance (RVC), arterial vascular conductance (AVC), baroreflex sensitivity (BRS) index, and vascular reactivity. Acute intravenous (iv) administration of LQFM-21 (0.05, 0.1, 0.2, and 0.4 mg kg-1) reduced MAP and HR, and increased RVC and AVC. Chronic oral administration of LQFM-21 (15 mg kg-1) for 15 days reduced MAP without altering BRS. The blockade of muscarinic receptors and nitric oxide synthase by intravenous infusion of atropine and L-NAME, respectively, attenuated cardiovascular effects of LQFM-21. In addition, ex vivo experiments showed that LQFM-21 induced an endothelium-dependent relaxation in isolated aortic rings from SHR. This effect was blocked by guanylyl cyclase inhibitor (ODQ) and L-NAME. These findings suggest the involvement of muscarinic receptor and NO/cGMP pathway in the antihypertensive and vasodilator effects of LQFM-21.
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Affiliation(s)
- Neidiane R Trindade
- Center for Neuroscience and Cardiovascular Research, Department of Physiological Sciences, Federal University of Goiás, Goiânia, Brazil
| | - Paulo R Lopes
- Center for Neuroscience and Cardiovascular Research, Department of Physiological Sciences, Federal University of Goiás, Goiânia, Brazil
| | - Lara M Naves
- Center for Neuroscience and Cardiovascular Research, Department of Physiological Sciences, Federal University of Goiás, Goiânia, Brazil
| | | | - Pedro H Alves
- Integrative Laboratory of Cardiovascular and Neurological Pathophysiology, Department of Physiological Sciences, Federal University of Goiás, Goiânia, Brazil
| | - Nathalia O Amaral
- Center for Neuroscience and Cardiovascular Research, Department of Physiological Sciences, Federal University of Goiás, Goiânia, Brazil
| | - Luciano M Lião
- Institute of Chemistry, Federal University of Goiás, Goiânia, Brazil
| | - Ana C S Rebelo
- Department of Morphology, Federal University of Goiás, Goiânia, Brazil
| | - Carlos H Castro
- Integrative Laboratory of Cardiovascular and Neurological Pathophysiology, Department of Physiological Sciences, Federal University of Goiás, Goiânia, Brazil
| | - Valdir A Braga
- Department of Biotechnology, Biotechnology Center, Federal University of Paraiba, João Pessoa, Brazil
| | | | - Gustavo R Pedrino
- Center for Neuroscience and Cardiovascular Research, Department of Physiological Sciences, Federal University of Goiás, Goiânia, Brazil
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Kubacka M, Kotańska M, Kazek G, Waszkielewicz AM, Marona H, Filipek B, Mogilski S. Involvement of the NO/sGC/cGMP/K + channels pathway in vascular relaxation evoked by two non-quinazoline α 1-adrenoceptor antagonists. Biomed Pharmacother 2018; 103:157-166. [PMID: 29653360 DOI: 10.1016/j.biopha.2018.04.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 04/04/2018] [Accepted: 04/05/2018] [Indexed: 02/06/2023] Open
Abstract
The aim of this study was to explore the α1-adrenoceptor-independent mechanisms involved in the vasorelaxant properties of two non-quinazoline α1-adrenoceptors antagonists (MH-76 and MH-79). Endothelium intact and endothelium denuded rat aorta was contracted with 1 μM phenylephrine to plateau, and the vasodilatory effect of MH-76 and MH-79 was examined in the absence or presence of inhibitors of the different signal transduction pathways. cGMP concetration was measured in rat aorta (enzyme immunoassay kit). In human aortic endothelial cells (HAEC) NO production was examined using a DAF-FM DA fluorescent indicator, whereas in human aortic smooth muscle cells the influence of the title compounds on K+ efflux was evaluated. The vasorelaxant effect of MH-76 and MH-79 was attenuated by endothelium removal, Nω-Nitro-l-arginine methyl ester (L-NAME) and 1H-[1,2,4]Oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) pretreatment to the level characteristic for α1-adrenoreceptor blocking activity. In addition, the MH-76 and MH-79 induced relaxation was reduced by K+ channels blockers. In endothelium intact rat aorta, MH-76 and MH-79 caused an increase in cGMP level, whereas in HAEC they increased NO generation. In contrast, the reference, quinazoline based α1-antagonist prazosin, did not influence NO production. Our findings suggest that the mechanisms underlying the vasodilatory properties of non-quinazoline based α1-adrenoceptors antagonists MH-76 and MH-79 involve not only α1-adrenoceptor blocking activity but also the activation of the endothelial NO-cGMP signalling pathway and the subsequent opening of K+ channels. Our studies show that such double mechanism of action is superior to pure α1-adrenoceptor blockade, and may be considered as a promising alternative for the prevention and treatment of cardiovascular diseases.
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Affiliation(s)
- Monika Kubacka
- Department of Pharmacodynamics, Faculty of Pharmacy, Medical College, Jagiellonian University, Medyczna 9, 30-688, Kraków, Poland.
| | - Magdalena Kotańska
- Department of Pharmacodynamics, Faculty of Pharmacy, Medical College, Jagiellonian University, Medyczna 9, 30-688, Kraków, Poland
| | - Grzegorz Kazek
- Department of Pharmacological Screening, Chair of Pharmacodynamics, Faculty of Pharmacy, Medical College, Jagiellonian University, Medyczna 9, 30-688, Kraków, Poland
| | - Anna Maria Waszkielewicz
- Department of Bioorganic Chemistry, Chair of Organic Chemistry, Faculty of Pharmacy, Medical College, Jagiellonian University, Medyczna 9, 30-688, Kraków, Poland
| | - Henryk Marona
- Department of Bioorganic Chemistry, Chair of Organic Chemistry, Faculty of Pharmacy, Medical College, Jagiellonian University, Medyczna 9, 30-688, Kraków, Poland
| | - Barbara Filipek
- Department of Pharmacodynamics, Faculty of Pharmacy, Medical College, Jagiellonian University, Medyczna 9, 30-688, Kraków, Poland
| | - Szczepan Mogilski
- Department of Pharmacodynamics, Faculty of Pharmacy, Medical College, Jagiellonian University, Medyczna 9, 30-688, Kraków, Poland
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Sherikar AS, Dhavale RP, Bhatia MS. Synthesis, docking studies and in vitro evaluation of novel chalcones as potent inhibitors of phosphodiesterase 5 from human platelets and 5A from bovine recombinant. NEW J CHEM 2018. [DOI: 10.1039/c8nj02077a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chalcones with a nitric oxide (NO) donating scaffold and a variety of substituents were synthesized. A docking study was performed and molecules were evaluated for in vitro phosphodiesterase 5 and 5A inhibitory potency.
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Affiliation(s)
- Amol S. Sherikar
- Department of Pharmaceutical Chemistry
- Tatyasaheb Kore College of Pharmacy
- Dist-Kolhapur-416 113
- India
| | - Rakesh P. Dhavale
- Department of Pharmaceutical Chemistry
- Bharati Vidyapeeth College of Pharmacy, Kolhapur
- Kolhapur-416 013
- India
| | - Manish S. Bhatia
- Department of Pharmaceutical Chemistry
- Bharati Vidyapeeth College of Pharmacy, Kolhapur
- Kolhapur-416 013
- India
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10
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Zhuge Z, Paulo LL, Jahandideh A, Brandão MCR, Athayde-Filho PF, Lundberg JO, Braga VA, Carlström M, Montenegro MF. Synthesis and characterization of a novel organic nitrate NDHP: Role of xanthine oxidoreductase-mediated nitric oxide formation. Redox Biol 2017; 13:163-169. [PMID: 28578274 PMCID: PMC5458096 DOI: 10.1016/j.redox.2017.05.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/15/2017] [Accepted: 05/23/2017] [Indexed: 12/25/2022] Open
Abstract
In this report, we describe the synthesis and characterization of 1,3-bis(hexyloxy)propan-2-yl nitrate (NDHP), a novel organic mono nitrate. Using purified xanthine oxidoreductase (XOR), chemiluminescence and electron paramagnetic resonance (EPR) spectroscopy, we found that XOR catalyzes nitric oxide (NO) generation from NDHP under anaerobic conditions, and that thiols are not involved or required in this process. Further mechanistic studies revealed that NDHP could be reduced to NO at both the FAD and the molybdenum sites of XOR, but that the FAD site required an unoccupied molybdenum site. Conversely, the molybdenum site was able to reduce NDHP independently of an active FAD site. Moreover, using isolated vessels in a myograph, we demonstrate that NDHP dilates pre-constricted mesenteric arteries from rats and mice. These effects were diminished when XOR was blocked using the selective inhibitor febuxostat. Finally, we demonstrate that NDHP, in contrast to glyceryl trinitrate (GTN), is not subject to development of tolerance in isolated mesenteric arteries.
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Affiliation(s)
- Zhengbing Zhuge
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Luciano L Paulo
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB, Brazil
| | - Arghavan Jahandideh
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Maria C R Brandão
- Department of Chemistry, Federal University of Paraíba, João Pessoa, PB, Brazil
| | | | - Jon O Lundberg
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Valdir A Braga
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB, Brazil
| | - Mattias Carlström
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
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11
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Porpino SKP, Zollbrecht C, Peleli M, Montenegro MF, Brandão MCR, Athayde-Filho PF, França-Silva MS, Larsson E, Lundberg JO, Weitzberg E, Persson EG, Braga VA, Carlström M. Nitric oxide generation by the organic nitrate NDBP attenuates oxidative stress and angiotensin II-mediated hypertension. Br J Pharmacol 2016; 173:2290-302. [PMID: 27160064 DOI: 10.1111/bph.13511] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 03/11/2016] [Accepted: 05/02/2016] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND AND PURPOSE NO deficiency and oxidative stress are crucially involved in the development or progression of cardiovascular disease, including hypertension and stroke. We have previously demonstrated that acute treatment with the newly discovered organic nitrate, 2-nitrate-1,3-dibuthoxypropan (NDBP), is associated with NO-like effects in the vasculature. This study aimed to further characterize the mechanism(s) and to elucidate the therapeutic potential in a model of hypertension and oxidative stress. EXPERIMENTAL APPROACH A combination of ex vivo, in vitro and in vivo approaches was used to assess the effects of NDBP on vascular reactivity, NO release, NADPH oxidase activity and in a model of hypertension. KEY RESULTS Ex vivo vascular studies demonstrated NDBP-mediated vasorelaxation in mesenteric resistance arteries, which was devoid of tolerance. In vitro studies using liver and kidney homogenates revealed dose-dependent and sustained NO generation by NDBP, which was attenuated by the xanthine oxidase inhibitor febuxostat. In addition, NDBP reduced NADPH oxidase activity in the liver and prevented angiotensin II-induced activation of NADPH oxidase in the kidney. In vivo studies showed that NDBP halted the progression of hypertension in mice with chronic angiotensin II infusion. This was associated with attenuated cardiac hypertrophy, and reduced NADPH oxidase-derived oxidative stress and fibrosis in the kidney and heart. CONCLUSION AND IMPLICATIONS The novel organic nitrate NDBP halts the progression of angiotensin II-mediated hypertension. Mechanistically, our findings suggest that NDBP treatment is associated with sustained NO release and attenuated activity of NADPH oxidase, which to some extent requires functional xanthine oxidase.
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Affiliation(s)
- Suênia K P Porpino
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.,Dept. of Medical Cell Biology, Uppsala University, Uppsala, Sweden.,Biotechnology Center, Federal University of Paraíba, João Pessoa, PB, Brazil
| | - Christa Zollbrecht
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Maria Peleli
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | | | - Maria C R Brandão
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB, Brazil
| | | | | | - Erik Larsson
- Dept. of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Jon O Lundberg
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Eddie Weitzberg
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Erik G Persson
- Dept. of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Valdir A Braga
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB, Brazil
| | - Mattias Carlström
- Dept. of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
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12
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Overview of Antagonists Used for Determining the Mechanisms of Action Employed by Potential Vasodilators with Their Suggested Signaling Pathways. Molecules 2016; 21:495. [PMID: 27092479 PMCID: PMC6274436 DOI: 10.3390/molecules21040495] [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: 01/27/2016] [Revised: 03/23/2016] [Accepted: 03/28/2016] [Indexed: 01/04/2023] Open
Abstract
This paper is a review on the types of antagonists and the signaling mechanism pathways that have been used to determine the mechanisms of action employed for vasodilation by test compounds. Thus, we exhaustively reviewed and analyzed reports related to this topic published in PubMed between the years of 2010 till 2015. The aim of this paperis to suggest the most appropriate type of antagonists that correspond to receptors that would be involved during the mechanistic studies, as well as the latest signaling pathways trends that are being studied in order to determine the route(s) that atest compound employs for inducing vasodilation. The methods to perform the mechanism studies were included. Fundamentally, the affinity, specificity and selectivity of the antagonists to their receptors or enzymes were clearly elaborated as well as the solubility and reversibility. All the signaling pathways on the mechanisms of action involved in the vascular tone regulation have been well described in previous review articles. However, the most appropriate antagonists that should be utilized have never been suggested and elaborated before, hence the reason for this review.
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13
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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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14
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Homology modeling, vasorelaxant and bradykinin-potentiating activities of a novel hypotensin found in the scorpion venom from Tityus stigmurus. Toxicon 2015; 101:11-8. [DOI: 10.1016/j.toxicon.2015.04.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 03/18/2015] [Accepted: 04/21/2015] [Indexed: 11/23/2022]
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15
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Machado NT, Maciel PM, Alustau MC, Queiroz TM, Furtado FF, Assis VL, Veras RC, Araújo IG, Athayde-Filho PF, Medeiros IA. Nitric oxide as a target for the hypotensive and vasorelaxing effects induced by (Z)-ethyl 12-nitrooxy-octadec-9-enoate in rats. Eur J Pharm Sci 2014; 62:317-25. [DOI: 10.1016/j.ejps.2014.06.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 04/16/2014] [Accepted: 06/13/2014] [Indexed: 10/25/2022]
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16
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França-Silva MS, Balarini CM, Cruz JC, Khan BA, Rampelotto PH, Braga VA. Organic nitrates: past, present and future. Molecules 2014; 19:15314-23. [PMID: 25255247 PMCID: PMC6271939 DOI: 10.3390/molecules190915314] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 08/31/2014] [Accepted: 09/12/2014] [Indexed: 01/13/2023] Open
Abstract
Nitric oxide (NO) is one of the most important vasodilator molecules produced by the endothelium. It has already been established that NO/cGMP signaling pathway deficiencies are involved in the pathophysiological mechanisms of many cardiovascular diseases. In this context, the development of NO-releasing drugs for therapeutic use appears to be an effective alternative to replace the deficient endogenous NO and mimic the role of this molecule in the body. Organic nitrates represent the oldest class of NO donors that have been clinically used. Considering that tolerance can occur when these drugs are applied chronically, the search for new compounds of this class with lower tolerance potential is increasing. Here, we briefly discuss the mechanisms involved in nitrate tolerance and highlight some achievements from our group in the development of new organic nitrates and their preclinical application in cardiovascular disorders.
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Affiliation(s)
- Maria S França-Silva
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58037-760, Brazil
| | - Camille M Balarini
- Health Sciences Center, Federal University of Paraíba, João Pessoa, PB 58037-760, Brazil
| | - Josiane C Cruz
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58037-760, Brazil
| | - Barkat A Khan
- Faculty of Pharmacy and Alternative Medicine, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan
| | - Pabulo H Rampelotto
- Interdisciplinary Center for Biotechnology Research, Federal University of Pampa, Antônio Trilha Avenue, P.O. Box 1847, São Gabriel, RS 97300-000, Brazil.
| | - Valdir A Braga
- Biotechnology Center, Federal University of Paraíba, João Pessoa, PB 58037-760, Brazil.
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17
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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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18
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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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19
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Secondary metabolites from Sida rhombifolia L. (Malvaceae) and the vasorelaxant activity of cryptolepinone. Molecules 2013; 18:2769-77. [PMID: 23455668 PMCID: PMC6269840 DOI: 10.3390/molecules18032769] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 01/31/2013] [Accepted: 02/07/2013] [Indexed: 11/16/2022] Open
Abstract
The phytochemical study of Sida rhombifolia L. (Malvaceae) led to the isolation through chromatographic techniques of eleven secondary metabolites: sitosterol (1a) and stigmasterol (1b), sitosterol-3-O-b-D-glucopyranoside (2a) and stigmasterol-3-O-b-D-glucopyranoside (2b), phaeophytin A (3), 17³-ethoxypheophorbide A (4), 13²-hydroxy phaeophytin B (5), 17³-ethoxypheophorbide B (6), 5,7-dihydroxy-4'-methoxyflavone (7), cryptolepinone (8) and a salt of cryptolepine (9). Their structures were identified by ¹H- and ¹³C-NMR using one- and two-dimensional techniques. In addition, the vasorelaxant activity of cryptolepinone in rat mesenteric artery rings is reported herein for the first time.
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França-Silva MS, Monteiro MMO, Queiroz TM, Santos AF, Athayde-Filho PF, Braga VA. The new nitric oxide donor 2-nitrate-1,3-dibuthoxypropan alters autonomic function in spontaneously hypertensive rats. Auton Neurosci 2012; 171:28-35. [PMID: 23141524 DOI: 10.1016/j.autneu.2012.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 09/11/2012] [Accepted: 10/12/2012] [Indexed: 10/27/2022]
Abstract
Previously, we found that the nitrate synthesized from glycerin, 2-nitrate-1,3-dibuthoxypropan (NDBP), increased NO levels in rat aortic smooth muscle cells, inducing vasorelaxation in mesenteric artery. However, its effects on blood pressure and heart rate as well as on autonomic function were not investigated. This study evaluated the action of NDBP on these cardiovascular parameters in spontaneously hypertensive (SHR) and Wistar Kyoto (WKY) rats. We found that NDBP causes a biphasic response: hypotension and bradycardia followed by hypertension and tachycardia in WKY and SHR rats. Atropine (2mg/kg) blunted the hypotension induced by NDBP (15 mg/kg) in WKY and SHR (-75 ± 9 vs -12 ± 3 mmHg, n=6; -101 ± 6 vs -7 ± 2 bpm, n=6; respectively, p<0.05) and the pressor response to the compound was potentiated. Furthermore, vagotomy reduced the bradycardia in WKY and SHR (-136 ± 8 vs -17 ± 2, n=4, p<0.05; -141 ± 9 vs -8 ± 2, n=6, p<0.05). Moreover, hexamethonium (30 mg/kg) reduced both bradycardia (-278 ± 23 vs -48 ± 3 in WKY; -285 ± 16 vs -27 ± 19 in SHR, n=4; p<0.05) and pressor response (28 ± 8 vs -9 ± 5-WKY, n=6; 42 ± 7 vs -19 ± 8-SHR, n=5; p<0.05). In addition, administration of methylene blue (4 mg/kg) attenuated the hypotensive and bradycardic responses to the NDBP in all groups. In conclusion, NDBP induces bradycardia by direct vagal stimulation and pressor response by increasing sympathetic outflow to the periphery.
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