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Shah SA, Rana SL, Mohany M, Milošević M, Al-Rejaie SS, Farooq MA, Faisal MN, Aleem A. Fumaria indica (Hausskn.) Pugsley Hydromethanolic Extract: Bioactive Compounds Identification, Hypotensive Mechanism, and Cardioprotective Potential Exploration. ACS OMEGA 2024; 9:3642-3668. [PMID: 38284069 PMCID: PMC10809708 DOI: 10.1021/acsomega.3c07655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 11/26/2023] [Accepted: 12/11/2023] [Indexed: 01/30/2024]
Abstract
Fumaria indica (Hausskn.) Pugsley (FIP), a member of the Papaveraceae family, has a documented history of use in traditional medicine to treat cardiovascular ailments, particularly hypertension, and has shown substantial therapeutic efficacy among native cultures worldwide. However, the identification of bioactive compounds and the mechanism of hypotensive effect with the cardioprotective potential investigations are yet to be determined. The study aimed to identify bioactive compounds, explore the hypotensive mechanism and cardioprotective potential, and assess the safety of Fumaria indica (Hausskn.) Pugsley hydromethanolic extract (Fip.Cr). LC ESI-MS/MS analysis was performed to identify the bioactive compounds. In vitro experiments were conducted on isolated rat aorta and atria, and an in vivo invasive BP measurement model was used. Acute and subacute toxicities were assessed for 14 and 28 days, respectively. Isoproterenol (ISO) was used to develop the rats' myocardial infarction damage model. The mRNA levels of NLRP3 inflammasome and the abundance level of Firmicutes and Lactobacillus were measured by qRT-PCR. The hypotensive effect of FIP bioactive compounds was also investigated using in silico methods. Fip. Cr LC ESI-MS/MS analysis discovered 33 bioactive compounds, including alkaloids and flavonoids. In isolated rat aorta, Fip.Cr reversed contractions induced by K+ (80 mM), demonstrating a calcium entry-blocking function, and had a vasorelaxant impact on phenylephrine (PE) (1 μM)-induced contractions unaffected by L-NAME, ruling out endothelial NO participation. Fip.Cr caused negative chronotropic and inotropic effects in isolated rat atria unaffected by atropine pretreatment, eliminating cardiac muscarinic receptor involvement. Safety evaluation showed no major adverse effects. In vivo, invasive BP measurement demonstrated a hypotensive effect comparable to verapamil. Fip.Cr protected the rats from ISO-induced MI interventions significantly in biometrical and cardiac serum biochemical indicators and histological examinations by reducing inflammation via inhibiting NLRP3 inflammasome and elevating Firmicutes and Lactobacillus levels. The network pharmacology study revealed that the FIP hypotensive mechanism might involve MMP9, JAK2, HMOX1, NOS2, NOS3, TEK, SERPINE1, CCL2, and VEGFA. The molecular docking study revealed that FIP bioactive compounds docked better with CAC1C_ HUMAN than verapamil. These findings demonstrated that Fip.Cr's hypotensive mechanism may include calcium channel blocker activity. Fip.Cr ameliorated ISO-induced myocardial infarction in rats by attenuating inflammation, which might be via inhibiting NLRP3 inflammasome and may prove beneficial for treating MI.
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Affiliation(s)
- Syed Adil
Hussain Shah
- Department
of Pharmacology, Faculty of Pharmacy, Bahauddin
Zakariya University, Multan 60800, Pakistan
| | - Samia Latif Rana
- Department
of Pharmacology, Faculty of Pharmacy, Bahauddin
Zakariya University, Multan 60800, Pakistan
| | - Mohamed Mohany
- Department
of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 55760, Riyadh 11451, Saudi Arabia
| | - Marija Milošević
- Department
of Biology and Ecology, Faculty of Science, University of Kragujevac, 34000 Kragujevac, Serbia
| | - Salim S. Al-Rejaie
- Department
of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 55760, Riyadh 11451, Saudi Arabia
| | | | - Muhammad Naeem Faisal
- Institute
of Physiology and Pharmacology, University
of Agriculture, Faisalabad 60800, Pakistan
| | - Ambreen Aleem
- Department
of Pharmacology, Faculty of Pharmacy, Bahauddin
Zakariya University, Multan 60800, Pakistan
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Cardioprotective Potential of Aqueous Extract of Fumaria indica on Isoproterenol-Induced Myocardial Infarction in SD Rats. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:2112956. [PMID: 35757502 PMCID: PMC9232377 DOI: 10.1155/2022/2112956] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 05/02/2022] [Accepted: 05/06/2022] [Indexed: 11/21/2022]
Abstract
Ischemic heart disease (IHD) treatments and preventions by using plant extract and its phytochemical constituents have achieved considerable attention globally due to its cardioprotective effects. This study is aimed at investigating the cardioprotective and vascular effects of Fumaria indica (F. indica) crude extract on isoproterenol- (ISO-) induced myocardial infarction (MI) in Sprague-Dawley (SD) rats. Rats treated with isoproterenol (85 mg/kg, s.c), administered. Twice at an interval of 24 h showed a significant ST-segment elevation in ECG, edema, and necrosis in histopathology and also in troponin I (cTnI), creatine phosphokinase (CPK), lactate dehydrogenase (LDH), and aspartate aminotransferase (AST). Pretreatment with F. indica (10, 30, and 100 mg/kg, p.o) for 21 days significantly reversed the effects of isoproterenol-induced ischemic changes in the ECG, levels of cTnI, CPK, LDH, and AST, and histopathological changes. In isolated rat atrial strips, F. indica induced negative chronotropic and inotropic effects which were not affected by pretreatment with atropine, excluding role of cardiac muscarinic receptors. Cumulative addition of the extract induced a vasorelaxant effect on phenylephrine-evoked contractions in isolated rat aortic rings, which remained unchanged when challenged with L-NAME, excluding role of endothelial NO. However, extract of F. indica concentration dependently reversed contractions evoked with high K+, indicating calcium entry blocking effect. In conclusion, the F. indica extract is a cardioprotective remedy that ameliorates the isoproterenol-induced cardiotoxic effects and reverses cardiac ischemia, and the calcium antagonistic effect might be of useful in the treatment of MI.
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Dias CJ, Costa HA, Alves Dias-Filho CA, Ferreira AC, Rodrigues B, Irigoyen MC, Romão Borges AC, de Andadre Martins V, Branco Vidal FC, Ribeiro RM, Filho NS, Mostarda CT. Carvacrol reduces blood pressure, arterial responsiveness and increases expression of MAS receptors in spontaneously hypertensive rats. Eur J Pharmacol 2022; 917:174717. [PMID: 34953800 DOI: 10.1016/j.ejphar.2021.174717] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 12/09/2021] [Accepted: 12/20/2021] [Indexed: 12/28/2022]
Abstract
AIM To analyze the effect of the use of carvacrol in the cardiovascular system of spontaneously hypertensive rats (SHR). METHODS Methods: Twenty animals were allocated in four groups, one group control Wistar receiving only sorbitol, used as vehicle of administration of the carvacrol (Wistar-Vehicle), one control group SHR, also receive only sorbitol (SHR-Vehicle), a third, treated with losartan (SHR-Losartan/50 mg/kg), and the fourth, treated with carvacrol (SHR - Carvacrol/20 mg/kg). Sorbitol, losartan and carvacrol were administered by oral gavage daily for 30-day. Hemodynamic variables, vascular reactivity, biochemical parameters, and expression of Mas and AT1 receptors in kidney tissues were analyzed. RESULTS SHR- Carvacrol group showed a maximal effect of inhibition of 56% in the curve of norepinephrine. The Emax of the curves with Ca2+ were smaller in the groups SHR-losartan (40.17%) and SHR-carvacrol (35.71%) when compared to the SHR-Vehicle. The carvacrol increased the expression of the MAS receptors in kidney tissue. CONCLUSION Thirty days of treatment with carvacrol showed an antihypertensive effect associated with less peripheral vascular resistance. Also, treatment with carvacrol increased the expression of MAS receptors in kidney tissue.
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Affiliation(s)
- Carlos José Dias
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil; Cardiorenal Adaptations to Exercise Laboratory (LACE), Federal University of Maranhão, Pinheiro /Maranhao, Brazil
| | - Herikson Araújo Costa
- Health Sciences Graduate Program, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Carlos Alberto Alves Dias-Filho
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil
| | - Andressa Coelho Ferreira
- Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil; Graduate Program in Adult Health, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Bruno Rodrigues
- Physical Education College, State University of Campinas, Campinas/St Paul, Brazil
| | - Maria Claudia Irigoyen
- Department of Cardiopneumology, Faculty of Medicine of USP, InCor Experimental Hypertension Laboratory, St Paul/St Paul, Brazil
| | - Antônio Carlos Romão Borges
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Department of Physiological Sciences, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Vicenilma de Andadre Martins
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | | | - Rachel Melo Ribeiro
- Department of Physiological Sciences, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Natalino Salgado Filho
- Health Sciences Graduate Program, Federal University of Maranhao, St. Luis /Maranhao, Brazil
| | - Cristiano T Mostarda
- Northeast Biotechnology Network Postgraduate Program (Renorbio), Federal University of Maranhao, St. Luis /Maranhao, Brazil; Cardiovascular Adaptations to Exercise Laboratory (LACORE), Federal University of Maranhão, St. Luis /Maranhao, Brazil; Postgraduate Program in Physical Education, Federal University of Maranhao, St. Luis /Maranhao, Brazil; Graduate Program in Adult Health, Federal University of Maranhao, St. Luis /Maranhao, Brazil.
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Assis KS, Araújo IGA, de Azevedo FDLAA, Maciel PMP, Machado Calzerra NT, da Silva TAF, Assis VL, de Vasconcelos AP, Santos CAG, Meireles BRLA, Cordeiro AMTM, Araújo DAM, Ribeiro TP, Medeiros IA. Potassium Channel Activation Is Involved in the Cardiovascular Effects Induced by Freeze Dried Syzygium jambolanum (Lam.) DC Fruit Juice. BIOMED RESEARCH INTERNATIONAL 2018; 2018:4827461. [PMID: 30402480 PMCID: PMC6196999 DOI: 10.1155/2018/4827461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 07/25/2018] [Accepted: 09/03/2018] [Indexed: 11/17/2022]
Abstract
This work aimed to explore the cardiovascular effects induced by freeze-dried juice from Syzygium jambolanum (Lam.) DC fruits (JSJ). JSJ presented high polyphenol content and steroids. HPLC analysis revealed that 2,5-dihydroxybenzoic and caffeic acid were present in higher amounts in the JSJ extract. In rat, JSJ induces hypotension and vasodilatation in mesenteric arteries, with or without vascular endothelium. JSJ-mediated vasodilation response against contractions induced with KCl (60 mM) depolarizing solution was significantly lower than the responses induced by JSJ when evaluated against phenylephrine-induced contractions. To investigate the involvement of potassium channels we used Tyrode's solution with KCl (20 mM) or tetraethylammonium (1.0, 3.0, or 5.0 mM). In these conditions JSJ-induced effects were significantly attenuated. To investigate the potassium channel subtypes involved in the response, we used 4-aminopyridine, glibenclamide, BaCl2, and iberiotoxin. In the presence (simultaneous) of different potassium channel blockers we observed a significant attenuation of JSJ-induced effect. Inhibition was also observed when using BaCl2, glibenclamide, or 4-aminopyridine, separately. However, incubation with iberiotoxin did not promote changes in either maximum effect, or potency. We also evidenced a discrete participation of CaV channels in the JSJ-induced vasorelaxant effect. In addition, patch-clamp studies demonstrated that JSJ could activate potassium channels. In conclusion, JSJ promotes hypotension and vasorelaxation in rats, involving, at least, the activation of potassium channels.
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Affiliation(s)
- Kívia S. Assis
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Islania G. A. Araújo
- Departamento de Ciências Farmacêuticas, (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Fátima de L. A. A. de Azevedo
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Priscilla M. P. Maciel
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Natália T. Machado Calzerra
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Tays A. F. da Silva
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Valéria L. Assis
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Aliny P. de Vasconcelos
- Departamento de Biotecnologia, Centro de Biotecnologia/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Carlos A. G. Santos
- Centro de Educação e Saúde, Unidade Acadêmica de Biologia e Química, Universidade Federal de Campina Grande (UFCG) Cuité, Paraíba, 58750-000, Brazil
| | - Bruno R. L. A. Meireles
- Departamento de Tecnologia de Alimentos, Centro de Tecnologia e Desenvolvimento Regional - CTDR, Universidade Federal de Paraíba, João Pessoa, Paraíba, Brazil
| | - Angela M. T. M. Cordeiro
- Centro de Educação e Saúde, Unidade Acadêmica de Biologia e Química, Universidade Federal de Campina Grande (UFCG) Cuité, Paraíba, 58750-000, Brazil
| | - Demetrius A. M. Araújo
- Departamento de Biotecnologia, Centro de Biotecnologia/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Thais P. Ribeiro
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
| | - Isac A. Medeiros
- Programa de Pós-Graduação em Produtos Naturais e Sintéticos Bioativos/Centro de Ciências da Saúde (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
- Departamento de Ciências Farmacêuticas, (CCS)/Universidade Federal da Paraíba (UFPB), João Pessoa 58059-900, Brazil
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Sargazi Zadeh G, Panahi N. Endothelium-independent vasorelaxant activity of Trachyspermum ammi essential oil on rat aorta. Clin Exp Hypertens 2017; 39:133-138. [PMID: 28287882 DOI: 10.1080/10641963.2016.1235178] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Several pharmacological activities of the essential oil of Trachyspermum ammi seeds (TAEO) have been previously studied. These include antitussive, antihypertensive, and antispasmodic effects. However, its action on isolated aorta has not yet been studied. This study was aimed to investigate the vasorelaxant activity of TAEO and characterize its mechanism of action. Extraction of TAEO was performed using Clevenger-type apparatus with the final content of 4.5% (v/w). To evaluate some probable mechanisms of action of TAEO, the action isometric tension was then measured in the aortic rings from Wistar rats which were precontracted with phenylephrine (PHE) (1 µM) or KCl (60 mM). The major constituents of TAEO included Thymol (38.1%), gamma-terpinene (33.3%), and p-cymene (23.1%), as was analyzed by GC-MS. The cumulative concentrations of TAEO reduced precontraction caused by PHE and KCl (p < 0.05) significantly, which was dose dependent. The vasorelaxation caused by TAEO was not influenced in the presence of methylene blue and L-NAME in the endothelium-intact and denuded aorta ring. The inhibitory effect of TAEO on the aortic rings precontracted with KCl and PHE was considerably reduced by nifedipine. These findings hypothesized that the vasorelaxation caused by TAEO is completely endothelium independent and the extracellular Ca2+ influx was also inhibited by TAEO.
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Affiliation(s)
- G Sargazi Zadeh
- a Department of Veterinary Basic Sciences, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - N Panahi
- a Department of Veterinary Basic Sciences, Science and Research Branch , Islamic Azad University , Tehran , Iran
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Marinko M, Novakovic A, Nenezic D, Stojanovic I, Milojevic P, Jovic M, Ugresic N, Kanjuh V, Yang Q, He GW. Nicorandil directly and cyclic GMP-dependently opens K+ channels in human bypass grafts. J Pharmacol Sci 2015; 128:59-64. [PMID: 25850381 DOI: 10.1016/j.jphs.2015.03.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 02/08/2015] [Accepted: 03/10/2015] [Indexed: 02/07/2023] Open
Abstract
As we previously demonstrated the role of different K(+) channels in the action of nicorandil on human saphenous vein (HSV) and human internal mammary artery (HIMA), this study aimed to analyse the contribution of the cGMP pathway in nicorandil-induced vasorelaxation and to determine the involvement of cGMP in the K(+) channel-activating effect of nicorandil. An inhibitor of soluble guanylate cyclase (GC), ODQ, significantly inhibited nicorandil-induced relaxation, while ODQ plus glibenclamide, a selective ATP-sensitive K(+) (KATP) channel inhibitor, produced a further inhibition of both vessels. In HSV, ODQ in combination with 4-aminopyridine, a blocker of voltage-gated K(+) (KV) channels, did not modify the concentration-response to nicorandil compared with ODQ, whereas in HIMA, ODQ plus iberiotoxin, a selective blocker of large-conductance Ca(2+)-activated K(+) (BKCa) channels, produced greater inhibition than ODQ alone. We showed that the cGMP pathway plays a significant role in the vasorelaxant effect of nicorandil on HSV and HIMA. It seems that nicorandil directly opens KATP channels in both vessels and BKCa channels in HIMA, although it is possible that stimulation of GC contributes to KATP channels activation in HIMA. Contrary, the activation of KV channels in HSV is probably due to GC activation and increased levels of cGMP.
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Affiliation(s)
- Marija Marinko
- Department of Pharmacology, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
| | - Aleksandra Novakovic
- Department of Pharmacology, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia.
| | - Dragoslav Nenezic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia; Institute for Cardiovascular Diseases "Dedinje", Belgrade, Serbia
| | - Ivan Stojanovic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia; Institute for Cardiovascular Diseases "Dedinje", Belgrade, Serbia
| | - Predrag Milojevic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia; Institute for Cardiovascular Diseases "Dedinje", Belgrade, Serbia
| | - Miomir Jovic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia; Institute for Cardiovascular Diseases "Dedinje", Belgrade, Serbia
| | - Nenad Ugresic
- Department of Pharmacology, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
| | | | - Qin Yang
- Department of Surgery, The Chinese University of Hong Kong, Hong Kong; TEDA International Cardiovascular Hospital, Medical College, Nankai University, Tianjin, China
| | - Guo-Wei He
- TEDA International Cardiovascular Hospital, Medical College, Nankai University, Tianjin, China; Providence Heart & Vascular Institute, Albert Starr Academic Center, Department of Surgery, Oregon Health and Science University, Portland, OR, USA
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Antihypertensive Effect of Syzygium cumini in Spontaneously Hypertensive Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:605452. [PMID: 25614751 PMCID: PMC4295347 DOI: 10.1155/2014/605452] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 12/04/2014] [Indexed: 11/18/2022]
Abstract
This study evaluated the in vivo potential antihypertensive effect of hydroalcoholic extract of Syzygium cumini leaves (HESC) in normotensive Wistar rats and in spontaneously hypertensive rats (SHR), as well as its in vitro effect on the vascular reactivity of resistance arteries. The hypotensive effect caused by intravenous infusion of HESC (0.01-4.0 mg/kg) in anesthetized Wistar rats was dose-dependent and was partially inhibited by pretreatment with atropine sulfate. SHR received HESC (0.5 g/kg/day), orally, for 8 weeks and mean arterial pressure, heart rate, and vascular reactivity were evaluated. Daily oral administration of HESC resulted in a time-dependent blood pressure reduction in SHR, with a maximum reduction of 62%. In the endothelium-deprived superior mesenteric arteries rings the treatment with HESC reduced by 40% the maximum effect (E max) of contraction induced by NE. The contractile response to calcium and NE of endothelium-deprived mesenteric rings isolated from untreated SHR was reduced in a concentration-dependent manner by HESC (0.1, 0.25, and 0.5 mg/mL). This study demonstrated that Syzygium cumini reduces the blood pressure and heart rate of SHR and that this antihypertensive effect is probably due to the inhibition of arterial tone and extracellular calcium influx.
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Activity of nicorandil, a nicotinamide derivative with a nitrate group, in the experimental model of pain induced by formaldehyde in mice. Pharmacol Biochem Behav 2013; 106:85-90. [DOI: 10.1016/j.pbb.2013.03.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 03/04/2013] [Accepted: 03/08/2013] [Indexed: 11/21/2022]
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Wang ZQ, Xu JF, Wang JP, Zhao WJ, Zeng M. Involvement of guanylate cyclase and K+ channels in relaxation evoked by ferulate nitrate in rat aorta artery. J Pharmacol Sci 2013; 118:521-30. [PMID: 22510967 DOI: 10.1254/jphs.11179fp] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
Vasorelaxant properties of N-2-(ferulamidoethyl)-nitrate (ferulate nitrate, FLNT), a newly synthesized nitrate, were compared with those of isosorbide dinitrate, nicorandil, nitroglycerin, and 8-bromoguanosine 3,5-cyclic monophosphate (8-Br-cGMP) in rat aorta pre-contracted by phenylephrine. FLNT produced vasorelaxation in a concentration-dependent manner (0.1 - 100 µM). The degree of relaxation induced by FLNT was similar to that induced by isosorbide dinitrate. In addition, removal of endothelium did not affect the relaxant effect of FLNT. FLNT caused a rightward shift of the cumulative concentration-response curves of phenylephrine and reduced the maximal efficacy of contraction. 1H-[1,2,4]Oxadiazolo-[4,3-a]quinoxalin-1-one (ODQ, 10 µM) and K(+)-channel blockers charybdotoxin (CHT, 0.1 µM) and BaCl(2) (1 µM) reduced the relaxant effect of FLNT in the endothelium-denuded arteries, whereas glibenclamide (1 µM) and 4-aminopyridine (1 mM) failed to influence FLNT-induced vasorelaxation. Furthermore, in the presence of ODQ, both CHT (0.1 µM) and BaCl(2) (1 µM) still significantly reduced the relaxation evoked by FLNT. Pretreatment of vessels with hydroxocobalamin, a nitric oxide scavenger, abolished the FLNT effect. These findings demonstrate that FLNT induces relaxation of the rat aorta rings endothelium-independently. Furthermore, we demonstrated that FLNT-induced vasorelaxation is related to its stimulation of soluble guanylate cyclase and activation of K(+) channels.
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Affiliation(s)
- Zhan-Qing Wang
- Department of Pharmacology, General Hospital of Beijing Military Command, Beijing, China.
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Different K+ Channels Are Involved in Relaxation of Arterial and Venous Graft Induced by Nicorandil. J Cardiovasc Pharmacol 2011; 58:602-8. [DOI: 10.1097/fjc.0b013e31823003f2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Soncini R, Santiago MB, Orlandi L, Moraes GOI, Peloso ALM, dos Santos MH, Alves-da-Silva G, Paffaro VA, Bento AC, Giusti-Paiva A. Hypotensive effect of aqueous extract of Averrhoa carambola L. (Oxalidaceae) in rats: an in vivo and in vitro approach. JOURNAL OF ETHNOPHARMACOLOGY 2011; 133:353-357. [PMID: 20937374 DOI: 10.1016/j.jep.2010.10.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 09/30/2010] [Accepted: 10/02/2010] [Indexed: 05/30/2023]
Abstract
AIM OF THE STUDY Averrhoa carambola L. (Oxalidaceae) leaves are used in Brazilian traditional medicine to treat hypertension. This study was conducted to evaluate the hypotensive effect of the aqueous extract of Averrhoa carambola (AEAc) and its underlying mechanisms in the isolated rat aorta. MATERIALS AND METHODS The effect of AEAc on the mean arterial pressure (MAP) was determined in vivo in anesthetized rats. In vitro, thoracic aortic rings were isolated and suspended in organ baths, and the effects of AEAc were studied by means of isometric tension recording experiments. In HPLC analysis, the fingerprint chromatogram of AEAc was established. RESULTS In normotensive rats, AEAc (12.5-50.0 mg/kg, i.v.) induced dose-dependent hypotension. In vitro, AEAc caused a depression in the E(max) response to phenylephrine without a change in sensibility. Also, in a depolarized Ca(2+)-free medium, AEAc inhibited CaCl(2)-induced contractions and caused a concentration-dependent rightward shift of the response curves, indicating that AEAc inhibited the contractile mechanisms involving extracellular Ca(2+) influx. CONCLUSIONS These results demonstrate the hypotensive effects of AEAc, and these effects may, in part, be due to the inhibition of Ca(2+), which supports previous claims of its traditional use.
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Affiliation(s)
- Roseli Soncini
- Department of Physiological Sciences, Institute of Biomedical Sciences, Federal University of Alfenas, Alfenas-MG, Brazil
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Adaramoye OA, Anjos RM, Almeida MM, Veras RC, Silvia DF, Oliveira FA, Cavalcante KV, Araújo IG, Oliveira AP, Medeiros IA. Hypotensive and endothelium-independent vasorelaxant effects of methanolic extract from Curcuma longa L. in rats. JOURNAL OF ETHNOPHARMACOLOGY 2009; 124:457-62. [PMID: 19481144 DOI: 10.1016/j.jep.2009.05.021] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2008] [Revised: 03/21/2009] [Accepted: 05/19/2009] [Indexed: 05/24/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Curcuma longa L. (CL) is a yellow rhizome that is used in African traditional medicine to treat palpitation, hypertension or other related blood circulation disorders. AIM OF THE STUDY To justify the use of CL in ethnomedicine, we investigated the vasorelaxant effect of methanolic extract of CL (CLME) and its underlying mechanisms in isolated rat mesenteric artery. MATERIALS AND METHODS The effect of CLME on the mean arterial pressure (MAP) and heart rate (HR) (pulse interval) were determined in vivo in non-anaesthetized rats. Superior mesenteric rings were isolated, suspended in organ baths containing Tyrode solution at 37 degrees C and gassed with 95% O(2)+5% CO(2), under a resting tension of 0.75 g. The vasorelaxant effects of CLME were studied by means of isometric tension recording experiments. RESULTS In normotensive rats, CLME (10, 20 and 30 mg/kg, i.v.) induced dose-dependent hypotension (2.0+/-0.5%; 27.1+/-5.0% and 26.7+/-4.6%, respectively), and pronounced bradycardia (5.8+/-1.2%, 19.3+/-3.2% and 22.9+/-4.6%, respectively). CLME (1-1000 microg/mL) induced concentration-dependent relaxation of tonic contractions evoked by phenylephrine (Phe) (10 microM) and KCl (80 mM) in rings with intact-endothelium (E(max)=82.3+/-3.2% and 97.7+/-0.7%) or denuded-endothelium (E(max)=91.4+/-1.0% and 97.8+/-1.1%). Also, in a depolarized, Ca(2+) free medium, CLME inhibited CaCl(2) (1 microM-30 mM)-induced contractions and caused a concentration-dependent rightward shift of the response curves, indicating that CLME inhibited the contractile mechanisms involving extracellular Ca(2+) influx. In addition, in Ca(2+) free media containing EGTA (1 mM), CLME inhibited the transient contraction of denuded rings constricted with Phe, but not those evoked by caffeine (20 mM). In contrast, neither glibenclamide, BaCl(2), tetraethylammonium nor 4-aminopyridine affected CLME-induced relaxation. CONCLUSIONS These results demonstrate the hypotensive and bradycardic effects of CLME, as well as its potent vasodilation of rat mesenteric arteries. These effects, may in part, be due to the inhibition of extracellular Ca(2+) influx and/or inhibition of intracellular Ca(2+) mobilization from Phe-sensitive stores.
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Ogawa N, Saito M, Mori A, Sakamoto K, Kametaka S, Nakahara T, Ishii K. Vasodilator effect of nicorandil on retinal blood vessels in rats. Naunyn Schmiedebergs Arch Pharmacol 2007; 375:323-8. [PMID: 17525845 DOI: 10.1007/s00210-007-0165-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2006] [Accepted: 04/20/2007] [Indexed: 10/23/2022]
Abstract
We examined the effect of nicorandil on retinal blood vessels in rats in vivo. Male Wistar rats (8 to 10 weeks old) were anaesthetised with thiobutabarbital (120 mg/kg, intraperitoneal). Fundus images were captured with a digital camera that was equipped with a special objective lens. Diameters of retinal blood vessels were measured with a personal computer. Nicorandil (1-300 microg kg(-1) min(-1), intravenous [i.v.]) increased diameters of retinal blood vessels and decreased systemic blood pressure in a dose-dependent manner. Both responses to nicorandil were attenuated by glibenclamide (20 mg/kg, i.v.), an adenosine triphosphate (ATP)-dependent K(+) (K(ATP)) channel blocker. On the other hand, indomethacin (5 mg/kg, i.v.), a cyclooxygenase inhibitor, attenuated the vasodilation of retinal blood vessels, but not depressor response, to nicorandil and sodium nitroprusside. Pinacidil (1-300 microg kg(-1) min(-1), i.v.), a K(ATP) channel opener, also dilated retinal blood vessels and decreased systemic blood pressure. The responses to pinacidil were prevented by glibenclamide, but not by indomethacin. The vasodilation of retinal arteriole, but not depressor response, to sodium nitroprusside (1-30 microg kg(-1) min(-1), i.v.), a nitric oxide donor, was attenuated by indomethacin. These results suggest that nicorandil dilates retinal blood vessels through opening of K(ATP) channels and production of prostaglandins that are probably generated by nitric oxide.
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Affiliation(s)
- Naoto Ogawa
- Department of Molecular Pharmacology, Kitasato University School of Pharmaceutical Sciences, 5-9-1 Shirokane, Minato-ku, Tokyo, 108-8641, Japan
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Jonas-Obichere M, Scholefield JH, Acheson A, Mundey M, Tyler H, Wilson VG. Comparison of the effects of nitric oxide donors and calcium channel blockers on the intrinsic myogenic tone of sheep isolated internal anal sphincter. Br J Surg 2005; 92:1263-9. [PMID: 16044408 DOI: 10.1002/bjs.5070] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND Chronic anal fissure is associated with considerable pain and anal hypertonia. Numerous clinical studies attest to the effectiveness of individual nitro-containing drugs and organic calcium channel blockers in this condition but there are few comparative studies. METHODS Isolated segments of sheep internal anal sphincter were prepared for isometric tension recording. The effect of various drugs on myogenic tone was examined in the absence or presence of sodium orthovanadate (SOV), an agent used to mimic anal hypertonia by increasing myogenic tone. RESULTS All the drugs tested produced concentration-dependent inhibition of myogenic tone, with the maximum effect ranging from 66.4 per cent (verapamil) to 100 per cent (sodium nitroprusside). Sodium nitroprusside and diltiazem were the most potent, followed by glyceryl trinitrate (GTN), nifedipine and verapamil, which had similar potency, and finally nicorandil. The potency of GTN and diltiazem was reduced threefold in the presence of 1 mmol/l SOV. The combined effect of GTN and diltiazem was greater than the effect of either agent alone, even in the presence of 3 mmol/l SOV. CONCLUSION Nitro-containing drugs and organic calcium channel blockers are potent inhibitors of anal sphincter myogenic tone that may be used in combination to treat chronic anal fissure.
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Affiliation(s)
- M Jonas-Obichere
- Centre of Integrated Systems Biology and Medicine, Department of Surgery, Queen's Medical Centre, Nottingham, UK
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15
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Yeh JL, Liou SF, Liang JC, Lee CH, Chiu CC, Lin YT, Chen IJ. Labedipinedilol-C: A Third-Generation Dihydropyridine-Type Calcium Channel Antagonist Displaying K+ Channel Opening, NO-Dependent and Adrenergic Antagonist Activities. J Cardiovasc Pharmacol 2005; 46:130-40. [PMID: 16044023 DOI: 10.1097/01.fjc.0000167016.61845.c8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Intravenous and oral labedipinedilol-C showed a dose-dependent long-lasting hypotension and a decrease of heart rate in normotensive and conscious spontaneously hypertensive rats (SHR). In isolated Wistar rat and guinea pig tissues, labedipinedilol-C competitively antagonized (-)isoproterenol-induced cardiac stimulation, tracheal relaxation, and phenylephrine-, CaCl2-, and high-K-induced aorta contractions in a concentration-dependent manner. The estimated pA2 and pKCa values were 8.22+/-0.04 and 7.11+/-0.52, respectively. [H]CGP-12177 binding to ventricle and lung tissues as well as [H]prazosin and [H]nitrendipine binding to brain membranes were inhibited by labedipinedilol-C with Ki values of 2.86, 9.03, 0.39, and 0.05 muM, respectively. The vasorelaxant effects of labedipinedilol-C on phenylephrine (10 microM)-induced contractions were attenuated by removing endothelium, by pretreatment with soluble guanylyl cyclase (sGC) inhibitors ODQ (10 microM) and methylene blue (10 microM), a NOS inhibitor L-NAME (100 microM), a K channel blocker TEA (10 mM), a KATP channel blocker glibenclamide (1 microM), and Ca-dependent K channel blockers apamin (1 microM) and charybdotoxin (0.1 microM). In human umbilical vein endothelial cells (HUVECs), labedipinedilol-C increased NO release, which was significantly inhibited by L-NAME. The Western blot analysis on HUVECs indicated that labedipinedilol-C increased the expression of eNOS. These results indicate that hypotension effects of labedipinedilol-C result from alpha-adrenoceptor and Ca entry-blocking activities and release of NO or NO-related substance from vascular endothelium. The endothelium-independent relaxation of vascular smooth muscle is probably linked to K channel opening and alpha-adrenoceptor-blocking activities.
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Affiliation(s)
- Jwu-Lai Yeh
- Department and Graduate Institute of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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16
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Lo YC, Tsou HH, Lin RJ, Wu DC, Wu BN, Lin YT, Chen IJ. Endothelium-dependent and -independent vasorelaxation by a theophylline derivative MCPT: roles of cyclic nucleotides, potassium channel opening and phosphodiesterase inhibition. Life Sci 2005; 76:931-44. [PMID: 15589969 DOI: 10.1016/j.lfs.2004.10.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2004] [Accepted: 09/27/2004] [Indexed: 11/15/2022]
Abstract
The vasorelaxation activities of MCPT, a newly synthesized xanthine derivative, were investigated in this study. In phenylephrine (PE)-precontracted rat aortic rings with intact endothelium, MCPT caused a concentration-dependent relaxation, which was inhibited by endothelium removed. This relaxation was also reduced by the presence of nitric oxide synthase inhibitor Nomega-nitro-L-arginine methylester (L-NAME, 100 microM), soluble guanylyl cyclase (sGC) inhibitors methylene blue (10 microM), 1 H-[1,2,4] oxidazolol [4,3-a] quinoxalin-1-one (ODQ, 1 microM), adenylyl cyclase (AC) blocker SQ 22536 (100 microM), ATP-sensitive K+ channel blocker (KATP) glibenclamide (1 microM), a Ca2+ activated K+ channels blocker tetraethylammonium (TEA, 10 mM) and a voltage-dependent potassium channels blocker 4-aminopyridine (4-AP, 100 microM). The vasorelaxant effects of MCPT together with IBMX (0.5 microM) had an additive action. In PE-preconstricted endothelium-denuded aortic rings, the vasorelaxant effects of MCPT were attenuated by pretreatments with glibenclamide (1 microM), SQ 22536 (100 microM) or ODQ (1 microM), respectively. MCPT enhanced cAMP-dependent vasodilator isoprenaline- and NO donor/cGMP-dependent vasodilator sodium nitroprusside-induced relaxation activities in endothelium-denuded aortic rings. In A-10 cell and washed human platelets, MCPT induced a concentration-dependent increase in intracellular cyclic GMP and cyclic AMP levels. In phosphodiesterase assay, MCPT displayed inhibition effects on PDE 3, PDE 4 and PDE 5. The inhibition % were 52 +/- 3.9, 32 +/- 2.6 and 8 +/- 1.1 respectively. The Western blot analysis on HUVEC indicated that MCPT increased the expression of eNOS. It is concluded that the vasorelaxation by MCPT may be mediated by the inhibition of phosphodiesterase, stimulation of NO/sGC/ cGMP and AC/cAMP pathways, and the opening of K+ channels.
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MESH Headings
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Cyclic AMP/metabolism
- Cyclic GMP/metabolism
- Dose-Response Relationship, Drug
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- In Vitro Techniques
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Nucleotides, Cyclic/metabolism
- Organothiophosphorus Compounds/pharmacology
- Phosphodiesterase Inhibitors/metabolism
- Potassium Channels/metabolism
- Rats
- Vasodilation/drug effects
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Affiliation(s)
- Yi-Ching Lo
- Department and post graduate institute of Pharmacology, College of Medicine, Kaohsiung Medical University, 100 Shin-Chuan 1st road, Kaohsiung 807, Taiwan
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17
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Guedes DN, Silva DF, Barbosa-Filho JM, Medeiros IA. Calcium antagonism and the vasorelaxation of the rat aorta induced by rotundifolone. Braz J Med Biol Res 2004; 37:1881-7. [PMID: 15558195 DOI: 10.1590/s0100-879x2004001200014] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The vasorelaxing activity of rotundifolone (ROT), a major constituent (63.5%) of the essential oil of Mentha x villosa, was tested in male Wistar rats (300-350 g). In isolated rat aortic rings, increasing ROT concentrations (0.3, 1, 10, 100, 300, and 500 microg/ml) inhibited the contractile effects of 1 microM phenylephrine and of 80 or 30 mM KCl (IC50 values, reported as means +/- SEM = 184 +/- 6, 185 +/- 3 and 188 +/- 19 microg/ml, N = 6, respectively). In aortic rings pre-contracted with 1 microM phenylephrine, the smooth muscle-relaxant activity of ROT was inhibited by removal of the vascular endothelium (IC50 value = 235 +/- 7 microg/ml, N = 6). Furthermore, ROT inhibited (pD2 = 6.04, N = 6) the CaCl2-induced contraction in depolarizing medium in a concentration-dependent manner. In Ca2+-free solution, ROT inhibited 1 microM phenylephrine-induced contraction in a concentration-dependent manner and did not modify the phasic contractile response evoked by caffeine (20 mM). In conclusion, in the present study we have shown that ROT produces an endothelium-independent vasorelaxing effect in the rat aorta. The results further indicated that in the rat aorta ROT is able to induce vasorelaxation, at least in part, by inhibiting both: a) voltage-dependent Ca2 channels, and b) intracellular Ca2+ release selectively due to inositol 1,4,5-triphosphate activation. Additional studies are required to elucidate the mechanisms underlying ROT-induced relaxation.
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Affiliation(s)
- D N Guedes
- Laboratório de Tecnologia Farmacêutica, Universidade Federal da Paraíba, João Pessoa, PB, Brazil
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18
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Pérez-Vizcaíno F, López-López JG, Santiago R, Cogolludo A, Zaragozá-Arnáez F, Moreno L, Alonso MJ, Salaices M, Tamargo J. Postnatal maturation in nitric oxide-induced pulmonary artery relaxation involving cyclooxygenase-1 activity. Am J Physiol Lung Cell Mol Physiol 2002; 283:L839-48. [PMID: 12225961 DOI: 10.1152/ajplung.00293.2001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The maturation in the vasodilator response to nitric oxide (NO) in isolated intrapulmonary arteries was analyzed in newborns and 15- to 20-day-old piglets. The vasodilator responses to NO gas but not to the NO donor sodium nitroprusside increased with age. The inhibitory effects of the superoxide dismutase inhibitor diethyldithiocarbamate and xanthine oxidase plus hypoxanthine and the potentiation induced by superoxide dismutase and MnCl(2) of NO-induced vasodilatation were similar in the two age groups. Diphenyleneiodonium (NADPH oxidase inhibitor) potentiated the response to NO, and this effect was more pronounced in the older animals. The nonselective cyclooxygenase inhibitors indomethacin and meclofenamate and the preferential cyclooxygenase-1 inhibitor aspirin augmented NO-induced relaxation specifically in newborns, whereas the selective cycloxygenase-2 inhibitor NS-398 had no effect. The expressions of alpha-actin, cycloxygenase-1, and cycloxygenase-2 proteins were similar, whereas Cu,Zn-superoxide dismutase decreased with age. Therefore, the present data suggest that the maturational increase in the vasodilatation of NO in the pulmonary arteries during the first days of extrauterine life involves a cycloxygenase-dependent inhibition of neonatal NO activity.
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Affiliation(s)
- Francisco Pérez-Vizcaíno
- Department of Pharmacology, Institute of Pharmacology and Toxicology, School of Medicine, Universidad Complutense, 28040 Madrid, Spain.
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19
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Weiss R, Mevissen M, Hauser DS, Scholtysik G, Portier CJ, Walter B, Studer UE, Danuser H. Inhibition of human and pig ureter motility in vitro and in vivo by the K(+) channel openers PKF 217-744b and nicorandil. J Pharmacol Exp Ther 2002; 302:651-8. [PMID: 12130728 DOI: 10.1124/jpet.302.2.651] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The relaxing property of the K(+) channel opener and nitric oxide donor nicorandil and the new K(+) channel opener PKF 217-744b was investigated on isolated human ureteral tissue in vitro and in intact ureters of anesthetized pigs in vivo. In addition, nicorandil and its antagonists, glibenclamide and methylene blue, were tested on isolated pig ureter tissue in vitro. Nicorandil decreased the frequency of spontaneous contractions in isolated pig ureter rings. This effect was antagonized by glibenclamide and methylene blue suggesting that the nicorandil induced relaxation of the ureter is mediated by activation of ATP-sensitive K(+) channels and involvement of soluble guanylate cyclase. Moreover, nicorandil and PKF 217-744b reduced the amplitude of electrically induced contractions in isolated human ureter rings. Calculations of EC(50) values showed that PKF 217-744b [EC(50) = 4.83 x 10(-8) M] was more potent than nicorandil [EC(50) = 4.38 x 10(-5) M]. Both drugs reduced the contraction frequency of the pig ureter after intravenous and topical administration in vivo. Intravenous, but not topical, administration of nicorandil and PKF 217-744b significantly decreased arterial blood pressure but did not affect the heart rate. The in vitro findings suggest that K(+) channel opening and nitric oxide release mediate the effect of nicorandil. Our in vivo results indicate that PKF 217-744b and nicorandil are promising drugs for clinical application in patients with acute stone colic to relieve obstruction and facilitate stone passage or to relax the ureter before ureteroscopy.
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Affiliation(s)
- Ruth Weiss
- Institute of Veterinary Pharmacology, Inselspital, University of Bern, CH-3010 Bern, Switzerland
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20
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Lin RJ, Wu BN, Shen KP, Huang CH, Liu ZI, Lin CY, Cheng CJ, Chen IJ. Xanthine-analog, KMUP-2, enhances cyclic GMP and K+ channel activities in rabbit aorta and corpus cavernosum with associated penile erection. Drug Dev Res 2002. [DOI: 10.1002/ddr.10048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Wu BN, Lin RJ, Lin CY, Shen KP, Chiang LC, Chen IJ. A xanthine-based KMUP-1 with cyclic GMP enhancing and K(+) channels opening activities in rat aortic smooth muscle. Br J Pharmacol 2001; 134:265-74. [PMID: 11564644 PMCID: PMC1572942 DOI: 10.1038/sj.bjp.0704231] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
1. KMUP-1 (1, 3, 5 mg kg(-1), i.v.), a xanthine derivative, produced dose-dependent sustained hypotensive and short-acting bradycardiac effects in anaesthetized rats. This hypotensive effect was inhibited by pretreatment with glibenclamide (5 mg kg(-1), i.v.). 2. In endothelium-intact or denuded aortic rings preconstricted with phenylephrine, KMUP-1 caused a concentration-dependent relaxation. This relaxation was reduced by endothelium removal, the presence of NOS inhibitor L-NAME (100 microM) and sGC inhibitors methylene blue (10 microM) and ODQ (1 microM). 3. The vasorelaxant effects of KMUP-1 was attenuated by pretreatment with various K(+) channel blockers TEA (10 mM), glibenclamide (1 microM), 4-AP (100 microM), apamin (1 microM) and charybdotoxin (ChTX, 0.1 microM). 4. Increased extracellular potassium levels (30 - 80 mM) caused a concentration-related reduction of KMUP-1-induced vasorelaxations. Preincubation with KMUP-1 (1, 10, 100 nM) increased the ACh-induced maximal vasorelaxations mediated by endogenous NO release, and enhanced the potency of exogenous NO-donor SNP. 5. The vasorelaxant responses of KMUP-1 (0.01, 0.05, 0.1 microM) together with a PDE inhibitor IBMX (0.5 microM) had an additive action. Additionally, KMUP-1 (100 microM) affected cyclic GMP metabolism since it inhibited the activity of PDE in human platelets. 6. KMUP-1 induced a dose-related increase in intracellular cyclic GMP levels in rat A10 vascular smooth muscle (VSM) cells, but not cyclic AMP. The increase in cyclic GMP content of KMUP-1 (0.1 - 100 microM) was almost completely abolished in the presence of methylene blue (10 microM), ODQ (10 microM), and L-NAME (100 microM). 7. In conclusion, these results indicate that KMUP-1 possesses the following merits: (1) stimulation of NO/sGC/cyclic GMP pathway and subsequent elevation of cyclic GMP, (2) K(+) channels opening, and (3) inhibition of PDE or cyclic GMP breakdown. Increased cyclic GMP display a prominent role in KMUP-1-induced VSM relaxations.
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MESH Headings
- Acetylcholine/pharmacology
- Adenylyl Cyclases/drug effects
- Adenylyl Cyclases/metabolism
- Animals
- Aorta/drug effects
- Aorta/metabolism
- Aorta/physiology
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/physiology
- Blood Pressure/drug effects
- Cells, Cultured
- Cromakalim/pharmacology
- Cyclic AMP/metabolism
- Cyclic GMP/metabolism
- Dose-Response Relationship, Drug
- Endothelium, Vascular/physiology
- Enzyme Inhibitors/pharmacology
- Glyburide/pharmacology
- Heart Rate/drug effects
- In Vitro Techniques
- Methylene Blue/pharmacology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/physiology
- NG-Nitroarginine Methyl Ester/pharmacology
- Nitric Oxide Synthase/drug effects
- Nitric Oxide Synthase/metabolism
- Nitroprusside/pharmacology
- Oxadiazoles/pharmacology
- Phosphoric Diester Hydrolases/drug effects
- Phosphoric Diester Hydrolases/metabolism
- Piperidines/pharmacology
- Potassium Channels/drug effects
- Potassium Channels/physiology
- Quinoxalines/pharmacology
- Rats
- Rats, Wistar
- Solubility
- Vasodilation/drug effects
- Vasodilator Agents/pharmacology
- Xanthine/chemistry
- Xanthine/pharmacology
- Xanthines/pharmacology
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Affiliation(s)
- Bin-Nan Wu
- Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan (R.O.C.)
| | - Rong-Jyh Lin
- Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan (R.O.C.)
| | - Chiu-Yin Lin
- Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan (R.O.C.)
| | - Kuo-Pyng Shen
- Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan (R.O.C.)
| | - Lien-Chai Chiang
- Department of Microbiology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan (R.O.C.)
| | - Ing-Jun Chen
- Department of Pharmacology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan (R.O.C.)
- Author for correspondence:
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López-López JG, Pérez-Vizcaíno F, Cogolludo AL, Ibarra M, Zaragozá-Arnáez F, Tamargo J. Nitric oxide- and nitric oxide donors-induced relaxation and its modulation by oxidative stress in piglet pulmonary arteries. Br J Pharmacol 2001; 133:615-24. [PMID: 11429384 PMCID: PMC1572823 DOI: 10.1038/sj.bjp.0704103] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2001] [Revised: 03/20/2001] [Accepted: 04/03/2001] [Indexed: 11/08/2022] Open
Abstract
Inhaled nitric oxide (iNO) is widely used in the treatment of pulmonary hypertension while inhaled NO donors have been suggested as an alternative therapy. The differential susceptibility to inactivation by oxidative stress and oxyhaemoglobin of NO and two NO donors, sodium nitroprusside (SNP) and S-nitroso-N-acetyl-penicillamine (SNAP) were analysed in isolated endothelium-denuded pulmonary arteries from 2-week-old piglets stimulated with U46619. NO, SNAP and SNP relaxed the arteries (pIC(30)=7.73+/-0.12, 7.26+/-0.17 and 6.43+/-0.13, respectively) but NO was not detected electrochemically in the bath after the addition of SNP and only at concentrations at which SNAP produced more than 50% relaxation. The sGC inhibitor ODQ (10(-6) M) or the sarcoplasmic Ca(2+)-ATPase thapsigargin (2x10(-6) M) markedly inhibited the relaxation induced by NO, SNAP and SNP. Addition of oxyhaemoglobin (3x10(-7) M) or diethyldithiocarbamate (1 mM) markedly inhibited NO- (pIC(30)=6.88+/-0.07 and 6.92+/-0.18, respectively), weakly inhibited SNAP- and had no effect on SNP-induced relaxation. Xanthine oxidase (5 mu ml(-1)) plus hypoxanthine (10(-4) M) markedly inhibited NO- (pIC(30)=6.96+/-0.12) but not SNAP- or SNP-induced relaxation. Superoxide dismutase (SOD), MnCl(2), diphenileneiodonium and exposing the luminal surface of the rings outwards (inversion) potentiated the relaxant responses of NO (pIC(30)=8.52+/-0.16, 8.23+/-0.11, 8.01+/-0.11 and 8.20+/-0.10, respectively). However, SOD did not modify the NO detected by the electrode and had no effect on SNAP- or SNP-induced relaxation. Therefore, the kinetics and local distribution of NO release of NO donors influence the susceptibility to the scavenging effects of oxyhaemoglobin and superoxide.
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Affiliation(s)
- José Gustavo López-López
- Department of Pharmacology, Institute of Pharmacology and Toxicology (CSIC), School of Medicine, Universidad Complutense, 28040 Madrid, Spain
| | - Francisco Pérez-Vizcaíno
- Department of Pharmacology, Institute of Pharmacology and Toxicology (CSIC), School of Medicine, Universidad Complutense, 28040 Madrid, Spain
| | - Angel L Cogolludo
- Department of Pharmacology, Institute of Pharmacology and Toxicology (CSIC), School of Medicine, Universidad Complutense, 28040 Madrid, Spain
| | - Manuel Ibarra
- Department of Pharmacology, Institute of Pharmacology and Toxicology (CSIC), School of Medicine, Universidad Complutense, 28040 Madrid, Spain
| | - Francisco Zaragozá-Arnáez
- Department of Pharmacology, Institute of Pharmacology and Toxicology (CSIC), School of Medicine, Universidad Complutense, 28040 Madrid, Spain
| | - Juan Tamargo
- Department of Pharmacology, Institute of Pharmacology and Toxicology (CSIC), School of Medicine, Universidad Complutense, 28040 Madrid, Spain
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Cogolludo AL, Pérez-Vizcaíno F, Zaragozá-Arnáez F, Ibarra M, López-López G, López-Miranda V, Tamargo J. Mechanisms involved in SNP-induced relaxation and [Ca+]i reduction in piglet pulmonary and systemic arteries. Br J Pharmacol 2001; 132:959-67. [PMID: 11181438 PMCID: PMC1572630 DOI: 10.1038/sj.bjp.0703894] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
1. We have compared the mechanisms involved in sodium nitroprusside (SNP)-induced relaxation and [Ca2+]i reduction in isolated piglet pulmonary (PA) and mesenteric (MA) arteries. 2. SNP (10(-8) M-3x10(-5) M) evoked a concentration-dependent relaxation of PA and MA (pD2=6.66+/-0.06 and 6.74+/-0.14, respectively) stimulated by noradrenaline, which was markedly reduced by the guanylate cyclase inhibitor ODQ. In fura 2-incubated PA and MA, SNP produced a parallel reduction in contractile force and in [Ca2+]i, expressed as the ratio of emitted fluorescence at 340 and 380 nm (F340/F380). 3. The inhibition of the Na+/K+-ATPase after the incubation in a K+-free medium or the exposure to ouabain (10(-6) M) inhibited SNP-induced relaxation in MA but not in PA. SNP-induced relaxation was not attenuated by 80 mM KCl plus nifedipine (10(-6) M) but was inhibited by thapsigargin (2x10(-6) M; pD2=5.69+/-0.19 and 5.89+/-0.19 for PA and MA, respectively). 4. Pretreatment of PA with thapsigargin and MA with thapsigargin plus ouabain induced a stronger inhibition on the reduction in [Ca2+]i than on the relaxation induced by SNP, indicating the existence of Ca2+-independent mechanisms. 5. The activation of the Na+/K+-ATPase by the addition of KCl after the incubation in a K+-free medium similarly reduced [Ca2+]i in PA and MA, whereas it relaxed with much less efficacy PA than MA. 6. We conclude that SNP reduces [Ca2+]i and causes relaxation through the activation of SERCA in PA and SERCA and Na+/K+-ATPase in MA. However, Ca2+-independent mechanisms also contribute to SNP-induced effects.
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Affiliation(s)
- A L Cogolludo
- Department of Pharmacology, Institute of Pharmacology and Toxicology (CSIC), School of Medicine, Universidad Complutense, 28040 Madrid, Spain.
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Pérez-Vizcaíno F, Cogolludo AL, Zaragozá-Arnáez F, Fajardo S, Ibarra M, López-López JG, Tamargo J. Vasodilator effects of sodium nitroprusside, levcromakalim and their combination in isolated rat aorta. Br J Pharmacol 1999; 128:1419-26. [PMID: 10602320 PMCID: PMC1571775 DOI: 10.1038/sj.bjp.0702924] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
1. The endothelial modulation of the relaxant responses to the nitric oxide (NO) donor sodium nitroprusside (SNP) and the KATP channel opener levcromakalim (LEM) and the interactions between these agents were analysed in isolated rat aorta. 2. LEM-induced relaxation was unchanged by endothelium removal or by the presence of L-NAME (10-4 M) or ODQ (10-6 M). In contrast, in KCl- (25 mM), but not in noradrenaline- (NA, 10-6 M) contracted arteries, SNP-induced relaxation was augmented by endothelium removal but not by L-NAME, indomethacin, glibenclamide nor charybdotoxin plus apamin. 3. The isobolographic analysis of the interactions between exogenously activated KATP channels and cyclic GMP using mixtures of SNP and LEM revealed that there were no interactions between both drugs at the proportions at which both drugs were active. However, the points for the SNP : LEM mixtures in proportions 10:1 and 1:10,000 (i.e. at concentrations at which LEM and SNP were inactive, respectively) fell significantly above the line of additivity indicating that there were negative interactions between both drugs at these selected proportions (about 5- and 2 fold inhibition, respectively). The former interaction was sensitive to glibenclamide, whereas the latter was insensitive ODQ. The magnitude of the 10:1 SNP:LEM interaction was smaller in endothelium-intact arteries and was absent in arteries stimulated by NA. 4. In conclusion, the relaxations induced by LEM and SNP were additive. However, the presence of endothelium and low concentrations of LEM inhibited SNP-induced relaxation. Both inhibitory effects were not additive and were only observed in KCl- and not in NA-contracted aortae.
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MESH Headings
- Adenosine Triphosphate/physiology
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Aorta, Thoracic/physiology
- Cromakalim/pharmacology
- Cyclic GMP/antagonists & inhibitors
- Cyclic GMP/biosynthesis
- Cyclic GMP/physiology
- Drug Combinations
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Endothelium, Vascular/physiology
- In Vitro Techniques
- Male
- Muscle Relaxation/drug effects
- Muscle Relaxation/physiology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/physiology
- Nitric Oxide/antagonists & inhibitors
- Nitric Oxide/physiology
- Nitric Oxide Donors/pharmacology
- Nitroprusside/pharmacology
- Potassium Channels/drug effects
- Potassium Channels/physiology
- Rats
- Rats, Wistar
- Vasodilator Agents/pharmacology
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Affiliation(s)
- F Pérez-Vizcaíno
- Departamento de Farmacología, Instituto de Farmacología y Toxicología (CSIC), Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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25
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Cogolludo AL, Pérez-Vizcaíno F, Fajardo S, Ibarra M, Tamargo J. Effects of nicorandil as compared to mixtures of sodium nitroprusside and levcromakalim in isolated rat aorta. Br J Pharmacol 1999; 126:1025-33. [PMID: 10193784 PMCID: PMC1571231 DOI: 10.1038/sj.bjp.0702375] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
1. The contribution of the relaxant mechanisms of nicorandil (NIC) were analysed by comparing its effects with those of sodium nitroprusside (SNP), levcromakalim (LEM) and mixtures (1:10, 1:30 and 1:100) of SNP:LEM in isolated endothelium-denuded rat aorta. 2. In rings precontracted with KCl (25 mM), the relative inhibitory potency of the soluble guanylate cyclase inhibitor ODQ and the K(ATP) channel inhibitor glibenclamide (GLI) on SNP:LEM mixtures showed a good correlation with the relative proportion of SNP and LEM in the mixtures. Furthermore, the degree of the inhibition by ODQ and GLI of the effects of the 1:30 SNP:LEM mixture varied as a function of the relative potency of SNP and LEM in KCl-, noradrenaline- (NA) or NA plus nifedipine-treated arteries. 3. The inhibitory effects of ODQ, GLI and ODQ plus GLI on NIC-induced relaxation was similar to that for the 1:30 SNP:LEM mixture in NA plus nifedipine-contracted arteries, but the inhibition of GLI or ODQ plus GLI was smaller in KCl-contracted arteries. 4. In conclusion, the relative importance of activation of the cyclic GMP pathway and K(ATP) channel opening in mixtures of SNP and LEM could be predicted by the proportion of the drugs in the mixtures and by the relative potency of SNP vs LEM in different experimental conditions. Furthermore, the present results suggest that besides these two mechanisms, a third ODQ- and GLI-insensitive mechanism, possibly involving Ca2+ channel blockade, also participates in the relaxant effects of NIC in KCl-induced contractions.
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Affiliation(s)
- Angel L Cogolludo
- Departamento de Farmacología, Instituto de Farmacología y Toxicología (CSIC), Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Francisco Pérez-Vizcaíno
- Departamento de Farmacología, Instituto de Farmacología y Toxicología (CSIC), Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain
- Author for correspondence:
| | - Susan Fajardo
- Departamento de Farmacología, Instituto de Farmacología y Toxicología (CSIC), Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Manuel Ibarra
- Departamento de Farmacología, Facultad de Farmacia, Universidad de Alcalá de Henares, 28871 Madrid, Spain
| | - Juan Tamargo
- Departamento de Farmacología, Instituto de Farmacología y Toxicología (CSIC), Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain
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