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Vasorelaxant and Antihypertensive Effects of Bergenin on Isolated Rat Aorta and High Salt-Induced Hypertensive Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2022:4886193. [PMID: 36457594 PMCID: PMC9708344 DOI: 10.1155/2022/4886193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 08/03/2022] [Accepted: 08/22/2022] [Indexed: 11/24/2022]
Abstract
Bergenin is a phenolic glycoside that has been reported to be present in some medicinal plants which are traditionally used for their antihypertensive actions. So, bergenin was investigated for antihypertensive and vasorelaxant experiments in a rat model. Bergenin produced a significant fall in the mean arterial pressure (MAP) of rats. To explore the involvement of NO and muscarinic receptors, rats were pretreated with L-NAME and atropine in-vivo. The L-NAME did not change significantly the effect of bergenin on MAP excluding the involvement of NO. Unlike the L-NAME, atropine pretreatment reduced the effect of bergenin on MAP, indicating the role of muscarinic receptors. In in-vitro study, the bergenin produced endothelium-dependent (at lower concentrations) and independent (at higher concentrations) vasorelaxation, which was attenuated significantly in the presence of atropine and indomethacin but not with L-NAME. While a partial response was observed against K+-induced contractions. This was further confirmed when bergenin partly shifted the CaCl2-CRCs toward right. Bergenin also suppressed the PE peak formation, indicating the antagonist effect against the release of Ca2+. Moreover, the bergenin-induced vasorelaxant response was not markedly attenuated with TEA, while significantly ablated with 4-AP and BaCl2. In conclusion, the antihypertensive effects of bergenin are due to Ca2+ channel blockade, K+ channels activation, and muscarinic receptor-linked vasodilation.
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Ahmad T, Javed A, Khan T, Althobaiti YS, Ullah A, Almutairi FM, Shah AJ. Investigation into the Antihypertensive Effects of Diosmetin and Its Underlying Vascular Mechanisms Using Rat Model. Pharmaceuticals (Basel) 2022; 15:951. [PMID: 36015099 PMCID: PMC9416473 DOI: 10.3390/ph15080951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/12/2022] [Accepted: 07/26/2022] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE Diosmetin is a flavonoid that is found in many important medicinal plants that have antihypertensive therapeutic potential. Diosmetin has been shown to have antiplatelet, anti-inflammatory and antioxidant properties, which suggests that it could be a potential candidate for use in antihypertensive therapy. METHODS In vivo and in vitro methods were used for our investigation into the antihypertensive effects of diosmetin. RESULTS Diosmetin significantly decreased the mean arterial pressure (MAP). The effects of diosmetin on the MAP and heart rate were more pronounced in hypertensive rats. To explore the involvement of the muscarinic receptors-linked NO pathway, Nω-nitro-L-arginine methyl ester (L-NAME) and atropine were pre-administered in vivo. The pretreatment with L-NAME did not significantly change the effects of diosmetin on the MAP by excluding the involvement of NO. Unlike L-NAME, the atropine pretreatment reduced the effects of diosmetin on the MAP, which demonstrated the role of the muscarinic receptors. In the in vitro study, diosmetin at lower concentrations produced endothelium-dependent and -independent (at higher concentrations) vasorelaxation, which was attenuated significantly by the presence of atropine and indomethacin but not L-NAME. Diosmetin was also tested for high K+-induced contractions. Diosmetin induced significant relaxation (similar to verapamil), which indicated its Ca2+ antagonistic effects. This was further confirmed by diosmetin shifting the CaCl2 CRCs toward the right due to its suppression of the maximum response. Diosmetin also suppressed phenylephrine peak formation, which indicated its antagonist effects on the release of Ca2+. Moreover, BaCl2 significantly inhibited the effects of diosmetin, followed by 4-AP and TEA, which suggested that the K+ channels had a role as well. CONCLUSIONS The obtained data showed the Ca2+ channel antagonism, potassium channel activation and antimuscarinic receptor-linked vasodilatory effects of diosmetin, which demonstrated its antihypertensive potential.
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Affiliation(s)
- Taseer Ahmad
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad Campus, University Road, Abbottabad 22060, Pakistan; (T.A.); (A.J.); (T.K.)
- Laboratory of Cardiovascular Research and Integrative Pharmacology, College of Pharmacy, University of Sargodha, Sargodha 40100, Pakistan
| | - Adil Javed
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad Campus, University Road, Abbottabad 22060, Pakistan; (T.A.); (A.J.); (T.K.)
| | - Taous Khan
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad Campus, University Road, Abbottabad 22060, Pakistan; (T.A.); (A.J.); (T.K.)
| | - Yusuf S. Althobaiti
- Department of Pharmacology and Toxicology, College of Pharmacy, Taif University, Taif 21944, Saudi Arabia;
- Addiction and Neuroscience Research Unit, Taif University, Taif 21944, Saudi Arabia
| | - Aman Ullah
- College of Pharmaceutical Sciences, Shifa Tameer-e-Millat University, Islamabad 44000, Pakistan;
| | - Farooq M. Almutairi
- Department of Clinical Laboratories Sciences, College of Applied Medical Sciences, University of Hafr Al-Batin, Hafr Al-Batin 39524, Saudi Arabia
| | - Abdul Jabbar Shah
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad Campus, University Road, Abbottabad 22060, Pakistan; (T.A.); (A.J.); (T.K.)
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Vasin MV. B-190 (Indralin) in Light of the History of the Formation of Ideas about the Mechanism of Action of Radioprotectors. BIOL BULL+ 2022. [DOI: 10.1134/s1062359021110091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ahmad T, Khan T, Alamgeer, Shah AJ. Juglone as antihypertensive agent acts through multiple vascular mechanisms. Clin Exp Hypertens 2020; 42:335-344. [PMID: 31523996 DOI: 10.1080/10641963.2019.1665674] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Background: Juglone, a natural phenolic compound obtained from the walnut tree, is known for its wide range of biological activities. However, it has yet to be tested for its effects on hypertension and vascular tone. This investigation was aimed to explore the antihypertensive effect and the nature of vascular reactivity of juglone in rat models.Methods: Juglone was tested in in vivo and in vitro experiments in rats. The responses were analyzed and recorded through a PowerLab data acquisition system.Results: Intravenous injection of juglone significantly decreased the mean arterial blood pressure (MAP) in normotensive and hypertensive rats (Max. fall, 43.50 ± 2.96 vs 49.66 ± 3.28 mmHg). In rats pretreated with Nω-Nitro l-arginine methyl ester (L-NAME), the effect of juglone on MAP was reduced as compared to the control. However, in rats pretreated with atropine the fall in MAP by juglone was not altered. Juglone induced relaxation in the phenylephrine, K+ (80 mM), and angiotensin II pretreated isolated rat aortic rings. This vasorelaxant effect was reduced with L-NAME pretreatment. Atropine pretreatment did not modify the vasorelaxant effect of juglone. Pre-incubation with juglone attenuated the intracellular Ca2+ release by suppressing phenylephrine peak formation and also shifted CaCl2 concentration-response curves (CRCs) to the right. Of note, combined treatment with 4-aminopyridine and barium chloride also reduced juglone-mediated vasorelaxation suggesting a role of K+-channels as well.Conclusion: In conclusion, juglone exerts its antihypertensive effect through vasorelaxation, which is mediated by nitric oxide, inhibition of intracellular calcium release and opening of K+-channels.
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Affiliation(s)
- Taseer Ahmad
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad, Pakistan.,Laboratory of Cardiovascular Research and Integrative Pharmacology, College of Pharmacy, University of Sargodha, Sargodha, Pakistan
| | - Taous Khan
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad, Pakistan
| | - Alamgeer
- Laboratory of Cardiovascular Research and Integrative Pharmacology, College of Pharmacy, University of Sargodha, Sargodha, Pakistan
| | - Abdul Jabbar Shah
- Department of Pharmacy, COMSATS University Islamabad, Abbottabad, Pakistan
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Sun N, Li D, Chen X, Wu P, Lu YJ, Hou N, Chen WH, Wong WL. New Applications of Oleanolic Acid and its Derivatives as Cardioprotective Agents: A Review of their Therapeutic Perspectives. Curr Pharm Des 2019; 25:3740-3750. [DOI: 10.2174/1381612825666191105112802] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 10/30/2019] [Indexed: 01/14/2023]
Abstract
Oleanolic acid is an analogue of pentacyclic triterpenoids. It has been used as a hepatic drug for over
20 years in China. Currently, there are only five approved drugs derived from pentacyclic triterpenoids, including
oleanolic acid (liver diseases), asiaticoside (wound healing), glycyrrhizinate (liver diseases), isoglycyrrhizinate
(liver disease) and sodium aescinate (hydrocephalus). To understand more about the bioactivity and functional
mechanisms of oleanolic acid, it can be developed as a potent therapeutic agent, in particular, for the prevention
and treatment of heart diseases that are the leading cause of death for people worldwide. The primary aim of this
mini-review is to summarize the new applications of oleanolic acid and its derivatives as cardioprotective agents
reported in recent years and to highlight their therapeutic perspectives in cardiovascular diseases.
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Affiliation(s)
- Ning Sun
- The State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Dongli Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Xiaoqing Chen
- Key Laboratory of Molecular Target & Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou 511436, China
| | - Panpan Wu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Yu-Jing Lu
- Goldenhealth Biotechnology Co. Ltd, Foshan 528000, China
| | - Ning Hou
- Key Laboratory of Molecular Target & Clinical Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou 511436, China
| | - Wen-Hua Chen
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Wing-Leung Wong
- The State Key Laboratory of Chemical Biology and Drug Discovery, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
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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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Chabert P, Akhtar MS, Jabeen Q, Delecolle J, Heintz D, Garo E, Hamburger M, Auger C, Lugnier C, Kim HJ, Oak MH, Schini-Kerth VB. Endothelium-independent vasorelaxant effect of a Berberis orthobotrys root extract via inhibition of phosphodiesterases in the porcine coronary artery. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2016; 23:793-799. [PMID: 27288914 DOI: 10.1016/j.phymed.2016.04.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 04/04/2016] [Accepted: 04/05/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Berberis orthobotrys Bien ex Aitch. (Berberidaceae) is a plant indigenous of Pakistan that is locally used for the treatment of hypertension. HYPOTHESIS This study evaluated the vasoactive properties of a Berberis orthobotrys root extract and its fractions, and investigated the role of the endothelium and the underlying mechanism. STUDY DESIGN An aqueous methanolic extract of Berberis orthobotrys roots was prepared and submitted to a multi-step liquid-liquid fractionation with solvents of increasing polarity. Vascular reactivity of the different fractions was assessed using porcine coronary artery rings either with or without endothelium, and in the presence or absence of specific pharmacological tools. The ability of Berberis orthobotrys extracts to affect phosphodiesterase (PDE) activity was evaluated using a radioenzymatic method and purified phosphodiesterases. RESULTS The aqueous methanol extract induced similar relaxations in coronary artery rings with and without endothelium, and, amongst the three derived preparations, the butanol fraction (BFBO) was slightly but significantly more effective than the ethyl acetate fraction and the aqueous residue in rings without endothelium. Analysis of the butanol fraction (BFBO) by LC-ELSD-MS indicated the presence of four major isoquinoline alkaloids including berberine. BFBO significantly potentiated the relaxations induced by cyclic GMP- and cyclic AMP-dependent relaxing agonists, and inhibited contractions to KCl, CaCl2, and U46619 in endothelium denuded rings. In contrast, BFBO did not affect relaxations to endothelium-dependent vasodilators. BFBO concentration-dependently inhibited the cyclic GMP-hydrolyzing activity of basal PDE1, calmodulin-activated PDE1 and PDE5, and of cyclic AMP-hydrolyzing activity of PDE3 and PDE4 with IC50 values ranging from 40 to 130µg/ml. CONCLUSION The butanol fraction of the aqueous methanol extract of Berberis orthobotrys roots induced pronounced endothelium-independent relaxations and inhibited contractile responses by acting directly at the vascular smooth muscle in the coronary artery. Moreover, BFBO potentiated relaxations induced by both cyclic GMP- and cyclic AMP-dependent vasodilators most likely due to its ability to inhibit several vascular PDEs, and in particular PDE4 and PDE5.
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Affiliation(s)
- P Chabert
- UMR CNRS 7213, Laboratory of Biophotonics and Pharmacology, Faculty of Pharmacy, University of Strasbourg, Illkirch, France
| | - M S Akhtar
- Faculty of Pharmacy and Alternative Medicine, Islamia University of Bahawalpur, Pakistan
| | - Q Jabeen
- Faculty of Pharmacy and Alternative Medicine, Islamia University of Bahawalpur, Pakistan
| | - J Delecolle
- IBMP, UPR 2357, University of Strasbourg, France
| | - D Heintz
- IBMP, UPR 2357, University of Strasbourg, France
| | - E Garo
- Department of Pharmaceutical Sciences, University of Basel, Switzerland
| | - M Hamburger
- Department of Pharmaceutical Sciences, University of Basel, Switzerland
| | - C Auger
- UMR CNRS 7213, Laboratory of Biophotonics and Pharmacology, Faculty of Pharmacy, University of Strasbourg, Illkirch, France
| | - C Lugnier
- UMR CNRS 7213, Laboratory of Biophotonics and Pharmacology, Faculty of Pharmacy, University of Strasbourg, Illkirch, France
| | - H-J Kim
- College of Pharmacy, Mokpo National University, Muan-gun, Jeollanamdo 534-729, Republic of Korea
| | - M-H Oak
- College of Pharmacy, Mokpo National University, Muan-gun, Jeollanamdo 534-729, Republic of Korea
| | - V B Schini-Kerth
- UMR CNRS 7213, Laboratory of Biophotonics and Pharmacology, Faculty of Pharmacy, University of Strasbourg, Illkirch, France.
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Mojzych M, Kubacka M, Mogilski S, Filipek B, Fornal E. Relaxant effects of selected sildenafil analogues in the rat aorta. J Enzyme Inhib Med Chem 2015; 31:381-8. [PMID: 25798686 DOI: 10.3109/14756366.2015.1024674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A new series of sulfonamide derivatives of pyrazolo[4,3-e][1,2,4]triazine with chiral amino group has been synthesized and characterized. The compounds were tested for their relaxant effects in the rat aorta. Evaluation of prepared derivatives demonstrated that compound (8a) is probably a non-selective phosphodiesterase (PDE) inhibitor, as it induced aortic relaxation through endothelium-independent mechanism.
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Affiliation(s)
- Mariusz Mojzych
- a Department of Chemistry , Siedlce University of Natural Sciences and Humanities , Siedlce , Poland
| | - Monika Kubacka
- b Department of Pharmacodynamics , Jagiellonian University Medical College , Kraków , Poland , and
| | - Szczepan Mogilski
- b Department of Pharmacodynamics , Jagiellonian University Medical College , Kraków , Poland , and
| | - Barbara Filipek
- b Department of Pharmacodynamics , Jagiellonian University Medical College , Kraków , Poland , and
| | - Emilia Fornal
- c Department of Chemistry , Laboratory of Separation and Spectroscopic Method Applications, Center for Interdisciplinary Research, The John Paul II Catholic University of Lublin , Lublin , Poland
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Nitric oxide-dependent vasodilation and Ca2+signalling induced by erythrodiol in rat aorta. ASIAN PACIFIC JOURNAL OF TROPICAL DISEASE 2015. [DOI: 10.1016/s2222-1808(15)60892-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Wolf J, Świerblewska E, Jasiel-Wojculewicz H, Gockowski K, Wyrzykowski B, Somers VK, Narkiewicz K. Theophylline therapy for Cheyne-Stokes respiration during sleep in a 41-year-old man with refractory arterial hypertension. Chest 2014; 146:e8-e10. [PMID: 25010981 DOI: 10.1378/chest.13-2897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
We report a case of a 41-year-old man who was noted to have position-dependent Cheyne-Stokes respiration with central sleep apnea (CSA) during sleep. The patient had multiple cardiovascular risk factors and target organ damages, including a history of two myocardial infarctions, transient ischemic attack, and chronic kidney disease. His hypertension was refractory to a number of antihypertensive medicines, however, a complete elimination of sleep-disordered breathing with oral theophylline treatment was paralleled by a significant BP fall with a subsequent need for reduction of antihypertensive drugs. Following these surprising observations we decided to withdraw theophylline from treatment (in-clinic). Theophylline discontinuation resulted in a gradual increase in BP and an urgent call for antihypertensive treatment modification. These observations suggest a potent hypotensive action of oral theophylline via Cheyne-Stokes respiration with CSA elimination. Our data suggest that CSA may be a mechanism that raises BP even during the daytime.
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Affiliation(s)
- Jacek Wolf
- Department of Hypertension and Diabetology Medical University of Gdańsk, Gdańsk, Poland; Department of Cardiovascular Diseases, International Clinical Research Center, St. Anne's University Hospital in Brno (FNUSA), Brno, Czech Republic.
| | - Ewa Świerblewska
- Department of Hypertension and Diabetology Medical University of Gdańsk, Gdańsk, Poland
| | | | - Krzysztof Gockowski
- Department of Hypertension and Diabetology Medical University of Gdańsk, Gdańsk, Poland
| | - Bogdan Wyrzykowski
- Department of Hypertension and Diabetology Medical University of Gdańsk, Gdańsk, Poland
| | - Virend K Somers
- Division of Cardiovascular Diseases, Mayo Clinic, Rochester MN
| | - Krzysztof Narkiewicz
- Department of Hypertension and Diabetology Medical University of Gdańsk, Gdańsk, Poland; Department of Cardiovascular Diseases, International Clinical Research Center, St. Anne's University Hospital in Brno (FNUSA), Brno, Czech Republic
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Zapata-Sudo G, Pontes LB, da Silva JS, Lima LM, Nunes IKDC, Barreiro EJ, Sudo RT. Benzenesulfonamide attenuates monocrotaline-induced pulmonary arterial hypertension in a rat model. Eur J Pharmacol 2012; 690:176-82. [PMID: 22728079 DOI: 10.1016/j.ejphar.2012.05.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 05/16/2012] [Accepted: 05/24/2012] [Indexed: 11/26/2022]
Abstract
In this study, we examined the effects of LASSBio-965 (N-[2-(3,4-dimethoxyphenyl) ethyl]-benzenesulfonamide), a compound designed as a simplified structure of a non-selective phosphodiesterase 4 inhibitor, on vascular smooth muscle in vitro as well as in a rat model of monocrotaline (MCT)-induced pulmonary arterial hypertension. LASSBio-965 (50 mg/kg) treatment caused a significant decrease in right systolic ventricular pressure (32.47 ± 3.09 mmHg) compared to the MCT-vehicle group (51.88 ± 3.23 mmHg; P<0.05) and in the ratio of right ventricular weight to left ventricular weight plus septum (0.42 ± 0.03 g compared to 0.59 ± 0.06 g, respectively; MCT-vehicle group; P<0.05). LASSBio-965 induced a concentration-dependent relaxation of rat aortic rings, which was decreased by mechanical removal of the endothelium. Milrinone, rolipram, and sildenafil reduced the maximum relaxation (100%) to 22.4 ± 5.8, 69.5 ± 5.6 and 80.1 ± 10.7%, respectively (P<0.05). Maximum relaxation responses of aortic and pulmonary artery rings were decreased in the MCT-vehicle group (54.80 ± 5.69 and 35.87 ± 4.78, respectively) compared to the control (91.51 ± 4.79 and 54.32 ± 2.39, respectively) but improved with LASSBio-965 treatment (50mg/kg; 88.43 ± 4.54 and 59.36 ± 4.83, respectively). These results indicate that LASSBio-965 can attenuate the pulmonary arterial hypertension in an animal model most likely through the nonselective inhibition of phosphodiesterases 3, 4, and 5.
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Affiliation(s)
- Gisele Zapata-Sudo
- Programa de Pós-Graduação em Farmacologia e Química Medicinal, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
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Pontes LB, Antunes F, Sudo RT, Raimundo JM, Lima LM, Barreiro EJ, Zapata-Sudo G. Vasodilatory activity and antihypertensive profile mediated by inhibition of phosphodiesterase type 1 induced by a novel sulfonamide compound. Fundam Clin Pharmacol 2011; 26:690-700. [PMID: 22066694 DOI: 10.1111/j.1472-8206.2011.00999.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
LASSBio-985 is a sulfonamide compound designed as a simplified structure of a nonselective phosphodiesterase type 4 (PDE-4) inhibitor that promotes vasodilatory activity in vitro. PDE are enzymes responsible for the hydrolysis of cyclic adenosine 3',5'- monophosphate and cyclic guanosine 3',5'-monophosphate. Five different isozymes of PDE are found in vascular smooth muscle (PDE1-PDE5). Aortic rings, with or without endothelium, from male normotensive and spontaneously hypertensive rats (SHR) were prepared for isometric tension recording. Blood pressure was measured in Wistar Kyoto (WKY) rats and SHR during intravenous infusion of LASSBio-985 (10 mg/kg/min) during 15 min. LASSBio-985 induced a concentration-dependent vasodilation in aortic rings from normotensive and SHR, which was almost completely inhibited in endothelium-denuded vessels. Vasodilatory activity was also reduced in endothelium-intact aortic rings that had been pretreated with N(ω)-nitro-L-arginine methyl ester hydrochloride (L-NAME), a nitric oxide synthase inhibitor and 1H-[1,2,4]oxadiazolod[4,3-a]quinoxalin-1-one (ODQ), a guanylate cyclase inhibitor. LASSBio-985-induced vasodilation was also inhibited by sildenafil (100 μm) and SQ 22536, a PDE5 inhibitor and adenylate cyclase inhibitor, respectively. To evaluate the involvement of some endothelial receptors, atropine, diphenhydramine, HOE 140, naloxone, propranolol, indomethacin, and wortmannin were tested, but none inhibited the effects of LASSBio-985. The residual effect observed on endothelium-denuded aortic rings was abolished by nicardipine, a voltage-sensitive-Ca(2+)-channel blocker. Intravenous infusion of LASSBio-985 (10 mg/kg/min) significantly reduced systolic and diastolic pressures in both WKY and SHR. LASSBio-985 is a compound with vasodilatory activity, which could be consequent to PDE1 inhibition and voltage-sensitive-Ca(2+)-channel blockade.
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Affiliation(s)
- Luana Braga Pontes
- Programa de Pós-Graduação em Farmacologia e Química Medicinal, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco J, Sala 14, 21941-590, Rio de Janeiro, Brazil
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13
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Abstract
In the concentration range that is normally achieved in humans, e.g., after the drinking of coffee or in patients treated with theophylline, the cardiovascular effects of methylxanthines are primarily due to antagonism of adenosine A(1) and A(2) receptors. Inhibition of phosphodiesterases or mobilization of intracellular calcium requires much higher concentrations. In conscious humans, acute exposure to caffeine results in an increase in blood pressure by an increased total peripheral resistance, and a slight decrease in heart rate. This overall hemodynamic response is composed of direct effects of caffeine on vascular tone, on myocardial contractility and conduction, and on the sympathetic nervous system. Caffeine is the most widely consumed methylxanthine, mainly derived from coffee intake. Regular coffee consumption can affect various traditional cardiovascular risk factors, including a slight increase in blood pressure, an increase in plasma cholesterol and homocysteine levels, and a reduced incidence of type 2 diabetes mellitus. Although most prospective studies have not reported an association between coffee consumption and coronary heart disease, these findings do not exclude that the acute hemodynamic and neurohumoral effects of coffee consumption could have an adverse effect in selected patient groups who are more vulnerable for these effects, based on their genetic profile or medication use.
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Affiliation(s)
- Niels P Riksen
- Department of Pharmacology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Cavalcante KVM, Correia NDA, Dias KLG, Silva DF, Silva-Filho JC, Araújo IGA, Lira BF, Athayde-Filho P, Medeiros IA. Endothelium-Derived Nitric Oxide Contributes to the Vasorelaxant Response Induced by Mesoionic 2-(4-Chlorophenyl)-3-methyl-4-(4-methoxyphenyl)-1;3-thiazolium-5-thyolate (CMMTT) in Rats. J Pharmacol Sci 2009; 110:29-35. [DOI: 10.1254/jphs.fp0071581] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Endothelial nitric oxide attenuates Na+/Ca2+ exchanger-mediated vasoconstriction in rat aorta. Br J Pharmacol 2008; 154:982-90. [PMID: 18469841 DOI: 10.1038/bjp.2008.178] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND AND PURPOSE The Na+/Ca2+ exchanger (NCX) may be an important modulator of Ca2+ entry and exit. The present study investigated whether NCX was affected by prostacyclin and nitric oxide (NO) released from the vascular endothelium, as NCX contains phosphorylation sites for PKA and PKG. EXPERIMENTAL APPROACH Rat aortic rings were set up in organ baths. Tension was measured across the ring with a force transducer. KEY RESULTS Lowering extracellular [Na+] ([Na+]o) to 1.18 mM induced vasoconstriction in rat endothelium-denuded aortic rings. This effect was blocked by the NCX inhibitor KB-R7943 (2-2-[4-(4-nitrobenzyloxy)phenyl] ethyl isothiourea methanesulphonate; 1 microM). In endothelium-intact aortic rings, decreasing [Na+]o did not constrict the aortic rings significantly, but after treatment with the guanylate cyclase inhibitor ODQ (1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one; 1 microM) or the NOS inhibitor L-NAME (N(omega)-nitro-L-arginine methyl ester; 50 microM), a vasoconstriction that was similar in size to that in endothelium-denuded preparations was evident. The vasorelaxation induced by the NO donor sodium nitroprusside sodium nitroprusside dihydrate (30 nM) was the same in the endothelium-denuded aortic rings preconstricted with either low Na+ (1.18 mM), the thromboxane A2 agonist U46619 (9,11-dideoxy-9alpha, 11alpha-methanoepoxy prostaglandin F(2alpha); 0.1 microM) or high K+ (80 mM). CONCLUSIONS AND IMPLICATIONS The results suggest that the endothelium inhibits NCX operation via guanylate cyclase/NO. This is stronger than for other constrictors such as phenylephrine and may relate to concomitant NCX-stimulated NO release from the endothelium. This finding may be important where NCX operates in reverse mode, such as during ischaemia, and highlights a new mechanism whereby the endothelium modulates Ca2+ homoeostasis in vascular smooth muscle.
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Rocha ML, Bendhack LM. Effects of K+ channel modulators on oscillatory contractions in sinoaortic denervated rat aortas. Biol Pharm Bull 2007; 30:2098-104. [PMID: 17978483 DOI: 10.1248/bpb.30.2098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sinoaortic denervated (SAD) rats present arterial pressure lability without sustained hypertension. We investigated the relation between sinoaortic denervation and the occurrence of oscillatory contractions in SAD rat aortas, as well as the effect of various K(+) channel modulators on these oscillations. Aortas were removed and concentration-effect curves to phenylephrine (0.01 to 10 muM) were constructed in arteries from SAD and Sham-operated rats in order to verify the occurrence of oscillations. We also evaluated the effects of various K(+) channel modulators on these oscillations. Only SAD rat aortas exhibited oscillatory contractions. Tetraethylammonium increased the frequency (28.5+/-3.5 to 41.5+/-4.5 counts/5 min) and amplitude (0.435+/-0.07 to 0.630+/-0.09 g) of the oscillations. Apamin and 4-aminopyridine did not alter the oscillations. Barium chloride converted the oscillatory contractions to a tonic contraction. Pinacidil rapidly blocked the oscillatory contractions and glibenclamide evoked reduction in amplitude from 0.410+/-0.07 to 0.180+/-0.06 g. Iberiotoxin increased the frequency of oscillatory contractions (from 28.0+/-3.5 to 51.5+/-7.5 counts/5 min) but decreased the amplitude (from 0.410+/-0.08 to 0.195+/-0.2 g). Our results demonstrate that SAD rat aortas exhibit oscillatory contractions and K(+) channels, mainly K(ATP) and BK(Ca), play a dominant role in these oscillations.
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Affiliation(s)
- Matheus Lavorenti Rocha
- Department of Pharmacology, Faculty of Medicine of Ribeirão Preto, University of Sao Paulo, Ribeirão Preto, SP, Brazil
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Psarra TA, Batzias GC, Peeters TL, Koutsoviti-Papadopoulou M. Theophylline and its metabolites produce a stimulating cholinergic effect on the small intestine and a nonadrenergic noncholinergic relaxing effect on the colon: a comparative study in the rabbit intestine. J Vet Pharmacol Ther 2007; 30:541-9. [PMID: 17991222 DOI: 10.1111/j.1365-2885.2007.00904.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The present study examines comparatively the effects of theophylline and its metabolites, 1-methylxanthine (1-MX), 3-methylxanthine (3-MX), 1,3-dimethyluric acid (1,3-DMU) and 1-methyluric acid (1-MU) along the rabbit intestine, and explores the underlying mechanism(s). In the small intestine, theophylline produces atropine- and hexamethonium-sensitive increases in both the amplitude of phasic contractions and the basal tone. All metabolites mimic the theophylline's stimulating effect. In particular, concerning the phasic contractions, all metabolites are more potent than theophylline in the duodenum and jejunum, while in the ileum, only 1-MU is more potent. Regarding the basal tone, the metabolites show, in most cases, higher efficacy in all small intestinal regions, the maximum effects of 3-MX and 1-MU on the duodenum and ileum being double or triple the one of theophylline. In the ascending colon, while lower concentrations of theophylline produce an atropine- and hexamethonium-sensitive increase in the basal tone, higher ones produce a postsynaptic, nonadrenergic noncholinergic (NANC) relaxing effect. 1-MU mimics, in a weaker manner, theophylline's effect, while the other metabolites produce only relaxation, the potency rank of order being 3-MX>1-MX=1,3-DMU>theophylline. It is suggested that the theophylline and its metabolites stimulatory effect involves a cholinergic pathway, while the relaxing one is due to 3('),5(')-cyclic adenosine monophosphate (cAMP) elevation mediated by the theophylline and its metabolites inhibitory action on phosphodiesterases (PDEs).
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Affiliation(s)
- T A Psarra
- Laboratory of Pharmacology, Veterinary Faculty, Aristotle University of Thessaloniki, Thessaloniki, Greece
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Aguirre-Crespo F, Vergara-Galicia J, Villalobos-Molina R, Javier López-Guerrero J, Navarrete-Vázquez G, Estrada-Soto S. Ursolic acid mediates the vasorelaxant activity of Lepechinia caulescens via NO release in isolated rat thoracic aorta. Life Sci 2006; 79:1062-8. [PMID: 16630635 DOI: 10.1016/j.lfs.2006.03.006] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2005] [Revised: 01/14/2006] [Accepted: 03/08/2006] [Indexed: 11/24/2022]
Abstract
We have determined that the methanolic extract of L. caulescens (MELc) produced a significant vasodilator effect in a concentration-dependent and endothelium-dependent manner. This relaxation was blocked by N(omega)-nitro-L-arginine methylester (L-NAME), indicating that MELc vasodilator properties are endothelium mediated due to liberation of nitric oxide (NO). In this paper we aimed to corroborate its mode of action. MELc effects on noradrenaline (NA)-induced contraction in isolated rat aortic thoracic rings with endothelium (+E), in the presence of atropine (0.1 microM) and 1-H-[1,2,4]-oxadiazolo-[4,3a]-quinoxalin-1-one (ODQ, 1 microM) were conducted. MELc relaxation curve was significantly shifted to the right in the presence of ODQ and atropine, thus confirming that its mode of action is related with activation of nitric oxide synthase (NOS) and the consequent increment in NO formation. Bio-guided study of MELc allowed the isolation of ursolic acid (UA, 50 mg) and ursolic-oleanolic acids mixture [UA/OA (7:3), 450 mg]. The relaxant effect of UA (0.038-110 microM) was evaluated in functional experiments. UA induced a significant relaxation in a concentration- and endothelium-dependent manner (IC(50)=44.15 microM) and did not produce a vasorelaxant effect on contraction evoked by KCl (80 mM). In addition, NA-induced contraction was significantly displaced to the right by UA (30 microM). In order to determine its mode of action, UA-induced relaxant effect was evaluated in the presence of atropine (0.1 microM), indomethacin (10 microM), L-NAME (100 microM) and ODQ (1 microM). Relaxation was blocked by L-NAME and ODQ. On the other hand, UA (3 microM) provoked a significant displacement to the left in the relaxation curve induced by sodium nitroprusside (SNP, 0.32 nM to 0.1 microM), but it was not significant in the presence of Carbamoyl choline (carbachol, 1 nM to 10 microM). These results indicate that UA-mediated relaxation is endothelium dependent, probably due to NO release, and the consequent activation of vascular smooth muscle soluble guanylate cyclase (sGC), a signal transduction enzyme that forms the second messenger cGMP.
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Affiliation(s)
- Francisco Aguirre-Crespo
- Facultad de Farmacia, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Colonia Chamilpa, 62210 Cuernavaca, Morelos, México
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