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Lee SH, Kwon SC, Ok SH, Ahn SH, Bae SI, Hwang Y, Park KE, Sohn JT. Linolenic acid enhances contraction induced by phenylephrine in isolated rat aorta. Eur J Pharmacol 2020; 890:173662. [PMID: 33131719 DOI: 10.1016/j.ejphar.2020.173662] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/12/2020] [Accepted: 10/20/2020] [Indexed: 11/19/2022]
Abstract
This study examined the effect of linolenic acid on the contraction of isolated endothelium-intact and -denuded rat aorta induced by phenylephrine and its underlying mechanism. This was conducted in the presence or absence of NW-nitro-L-arginine methyl ester (L-NAME), 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), methylene blue, and calmidazolium. The effects of linolenic acid on contraction induced by calcium chloride in calcium-free Krebs solution containing 60 mM potassium chloride were also examined. Moreover, the effect of linolenic acid on the association between intracellular calcium level ([Ca2+]i) and tension induced by phenylephrine was examined. Finally, we examined the effects of linolenic acid on cGMP formation and endothelial nitric oxide synthase (eNOS) phosphorylation induced by phenylephrine. Linolenic acid (5 × 10-5 M) increased phenylephrine-induced contraction in endothelium-intact aorta (standardized mean difference [SMD] of log ED50: 2.23), whereas it decreased this contraction in endothelium-denuded aorta (SMD: 1.96). L-NAME, ODQ, methylene blue, and calmidazolium increased phenylephrine-induced contraction in endothelium-intact aorta. Linolenic acid decreased contraction induced by calcium chloride in calcium-free Krebs solution containing 60 mM potassium chloride in endothelium-denuded aorta. Linolenic acid caused an increase in [Ca2+]i (SMD at 3 × 10-7 M phenylephrine: 1.63) and calcium sensitivity induced by phenylephrine in endothelium-intact aorta. Conversely, linolenic acid decreased [Ca2+]i (SMD: 0.99) induced by phenylephrine in endothelium-denuded aorta. Linolenic acid decreased cGMP formation and eNOS phosphorylation induced by phenylephrine. These results suggest that linolenic acid increases phenylephrine-induced contraction, which is attributed to linolenic acid inhibition of endothelial NO release rather than its decrease of [Ca2+]i in vascular smooth muscle.
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Affiliation(s)
- Soo Hee Lee
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 Beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Seong-Chun Kwon
- Department of Physiology, Institute of Clinical and Translational Research, Catholic Kwandong University, College of Medicine, Gangneung, 25601, Republic of Korea
| | - Seong-Ho Ok
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Changwon Hospital 11, Samjeongja-ro, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51472, Republic of Korea; Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, 15 Jinju-daero 816 Beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea; Institute of Health Sciences, Gyeongsang National University, Jinju-si, 52727, Republic of Korea
| | - Seung Hyun Ahn
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 Beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Sung Il Bae
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 Beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Yeran Hwang
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 Beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Kyeong-Eon Park
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 Beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Ju-Tae Sohn
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 Beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea; Institute of Health Sciences, Gyeongsang National University, Jinju-si, 52727, Republic of Korea.
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Ok SH, Lee SH, Kim JY, Kim HJ, Bae SI, Hwang Y, Tak S, Sohn JT. Lipid emulsion inhibits the vasodilation induced by a toxic dose of amlodipine in isolated rat aortae. Int J Med Sci 2019; 16:1621-1630. [PMID: 31839750 PMCID: PMC6909803 DOI: 10.7150/ijms.38502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 10/29/2019] [Indexed: 12/17/2022] Open
Abstract
The goal of this study was to examine the effect of lipid emulsion on the vasodilation induced in isolated endothelium-denuded rat aortae by a toxic dose of amlodipine. We examined the effects of lipid emulsion and verapamil on amlodipine-induced vasodilation. We also examined the effects of a mixture of lipid emulsion and amlodipine, as well as the centrifuged aqueous extract (CAE) obtained by ultracentrifuging such a mixture and then removing the upper lipid layer, on amlodipine-induced vasodilation. The effect of lipid emulsion on the amlodipine concentration was examined. Lipid emulsion attenuated amlodipine-induced vasodilation in isolated aortae. Both CAE and lipid emulsion containing amlodipine inhibited amlodipine-induced vasodilation. However, there was no significant difference in amlodipine-induced vasodilation between aortae treated with CAE and those treated with lipid emulsion containing amlodipine. Verapamil inhibited amlodipine-induced vasodilation. Lipid emulsion decreased the concentration of amlodipine. Lipid emulsion attenuated the vasodilation induced by a toxic amlodipine dose in NaF-precontracted aortae. The data show that lipid emulsion inhibited the vasodilation induced by a toxic amlodipine dose in isolated rat aortae by reducing the concentration of amlodipine. Amlodipine-induced vasodilation seems to be mediated mainly by blockade of L-type calcium channels and partially by inhibition of the Rho-kinase pathway.
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Affiliation(s)
- Seong-Ho Ok
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Changwon Hospital, Changwon, 51427, Republic of Korea.,Institute of Health Sciences, Gyeongsang National University, Jinju-si, 52727, Republic of Korea
| | - Soo Hee Lee
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Ji-Yoon Kim
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Hyun-Jin Kim
- Division of Applied Life Sciences (BK21 plus), Gyeongsang National University, Gyeongsang, Republic of Korea.,Department of Food Science & Technology, Institute of Agriculture and Life Science, Gyeongsang National University, Gyeongsang, Republic of Korea
| | - Sung Il Bae
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Yeran Hwang
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Seongyeong Tak
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea
| | - Ju-Tae Sohn
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Gyeongsang National University Hospital, 15 Jinju-daero 816 beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea.,Institute of Health Sciences, Gyeongsang National University, Jinju-si, 52727, Republic of Korea
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Xue W, Li Y, Li J, Yan L, Yang F. Endothelium-dependent relaxation induced by etomidate in the aortas of insulin-resistant rats. Arch Med Sci 2018; 14:1155-1162. [PMID: 30154900 PMCID: PMC6111356 DOI: 10.5114/aoms.2018.77256] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 12/15/2016] [Indexed: 12/20/2022] Open
Abstract
INTRODUCTION Few reports have mentioned the effect of etomidate on the aortas of insulin-resistant (IR) rats. In this study, we investigated the effect of etomidate on isolated IR aortas of rats, and explored its underlying mechanism. MATERIAL AND METHODS The IR rat model was established through feeding with a high-fructose diet. The systolic blood pressure (SBP) was measured by the tail-cuff method before grouping and at the end of the 8-week feeding; blood samples were also obtained for analysis. Thoracic aorta rings of IR rats were isolated and suspended in a tissue bath. The tensile force was recorded isometrically. The effect of etomidate on provoked contraction of the rings was assessed with or without a potassium channel blocker or NO synthase inhibitor. RESULTS Etomidate-induced relaxation in IR rings was greater than normal control (NC) rings (all p < 0.001 with etomidate log M of -4 to -6). NG-nitro-L-arginine methyl ester (L-NAME, an NO synthase inhibitors) inhibited etomidate-induced relaxation in NC rings, but had no effect on the IR rings (all p < 0.001 with etomidate log M of -4 to -6). Pre-incubation with glibenclamide (Gli, a potassium channel blocker) significantly inhibited etomidate-induced relaxation in NC and IR rings (all p < 0.001 with etomidate log M of -4 to -6), and had no inhibited effect on endothelial denuded aortic rings. CONCLUSIONS Insulin resistance increased etomidate-induced relaxation in rat aortas. Etomidate causes vasodilation in IR rat aortas via both endothelium-dependent and independent ways; impaired NO-mediated relaxation was disrupted and ATP-sensitive potassium (KATP) channel-mediated relaxation may be involved in the endothelium-dependent relaxation of etomidate in IR rats.
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Affiliation(s)
- Wenxin Xue
- Department of Pharmacy, Meitan General Hospital, Beijing, China
| | - Yiwen Li
- Department of Pharmacy, Meitan General Hospital, Beijing, China
| | - Jing Li
- Department of Pharmacy, Meitan General Hospital, Beijing, China
| | - Li Yan
- Department of Physiology and Pathophysiology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Fang Yang
- Department of Neurology, Meitan General Hospital, Beijing, China
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Wisutthathum S, Chootip K, Martin H, Ingkaninan K, Temkitthawon P, Totoson P, Demougeot C. Vasorelaxant and Hypotensive Effects of an Ethanolic Extract of Eulophia macrobulbon and Its Main Compound 1-(4'-Hydroxybenzyl)-4,8-Dimethoxyphenanthrene-2,7-Diol. Front Pharmacol 2018; 9:484. [PMID: 29872393 PMCID: PMC5972186 DOI: 10.3389/fphar.2018.00484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 04/24/2018] [Indexed: 11/30/2022] Open
Abstract
Background: Ethnopharmacological studies demonstrated the potential for Eulophia species to treat inflammation, cancer, and cardio-metabolic diseases. The aim of the study was to investigate the vasorelaxant effect of ethanolic Eulophia macrobulbon (EM) extract and its main phenanthrene on rat isolated mesenteric artery and to investigate the hypotensive effect of EM. Methods: The vasorelaxant effects of EM extract or phenanthrene and the underlying mechanisms were evaluated on second-order mesenteric arteries from Sprague Dawley rats. In addition, the acute hypotensive effect was evaluated in anesthetized rats infused with cumulative concentrations of the EM extract. Results: Both EM extract (10-4-1 mg/ml) and phenanthrene (10-7-10-4 M) relaxed endothelium-intact arteries, an effect that was partly reduced by endothelium removal (p < 0.001). A significant decrease in the relaxant effect of the extract and the phenanthrene was observed with L-NAME and apamin/charybdotoxin in endothelium-intact vessels, and with iberiotoxin in denuded vessels. SNP (sodium nitroprusside)-induced relaxation was significantly enhanced by EM extract and phenanthrene. By contrast, ODQ (1H-[1,2,4]oxadiazolo[4,3-a]quinoxaline-1-one), 4-aminopyridine and glibenclamide (endothelium-denuded vessels) and indomethacin (endothelium-intact vessels) had no effect. In calcium-free solution, both the EM extract and phenanthrene inhibited extracellular Ca2+-induced contraction in high KCl and phenylephrine (PE) pre-contracted rings. They also inhibited the intracellular Ca2+ release sensitive to PE. The acute infusion of EM extract (20 and 70 mg/kg) induced an immediate and transient dose-dependent hypotensive effect. Conclusion: The ethanolic extract of EM tubers and its main active compound, 1-(4'-hydroxybenzyl)-4,8-dimethoxyphenanthrene-2,7-diol (phenanthrene) induced vasorelaxant effects on rat resistance vessels, through pleiotropic effects including endothelium-dependent effects (NOS activation, enhanced EDH production) and endothelium-independent effects (opening of KCa channels, inhibition of Ca2+ channels, inhibition of intracellular Ca2+ release and PDE inhibition).
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Affiliation(s)
- Sutthinee Wisutthathum
- Department of Physiology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Krongkarn Chootip
- Department of Physiology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Hélène Martin
- PEPITE EA4267, Université Bourgogne Franche-Comté, Besançon, France
| | - Kornkanok Ingkaninan
- Department of Pharmaceutical Chemistry and Pharmacognosy, Faculty of Pharmaceutical Sciences, Naresuan University, Phitsanulok, Thailand
| | - Prapapan Temkitthawon
- Department of Pharmaceutical Chemistry and Pharmacognosy, Faculty of Pharmaceutical Sciences, Naresuan University, Phitsanulok, Thailand
| | - Perle Totoson
- PEPITE EA4267, Université Bourgogne Franche-Comté, Besançon, France
| | - Céline Demougeot
- PEPITE EA4267, Université Bourgogne Franche-Comté, Besançon, France
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Ok SH, Kwon SC, Kang S, Choi MJ, Sohn JT. Mepivacaine-induced intracellular calcium increase appears to be mediated primarily by calcium influx in rat aorta without endothelium. Korean J Anesthesiol 2014; 67:404-11. [PMID: 25558341 PMCID: PMC4280478 DOI: 10.4097/kjae.2014.67.6.404] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 06/21/2014] [Accepted: 07/07/2014] [Indexed: 11/28/2022] Open
Abstract
Background Mepivacaine induces contraction or decreased blood flow both in vivo and in vitro. Vasoconstriction is associated with an increase in the intracellular calcium concentration ([Ca2+]i). However, the mechanism responsible for the mepivacaine-evoked [Ca2+]i increase remains to be determined. Therefore, the objective of this in vitro study was to examine the mechanism responsible for the mepivacaine-evoked [Ca2+]i increment in isolated rat aorta. Methods Isometric tension was measured in isolated rat aorta without endothelium. In addition, fura-2 loaded aortic muscle strips were illuminated alternately (48 Hz) at two excitation wavelengths (340 and 380 nm). The ratio of F340 to F380 (F340/F380) was regarded as an amount of [Ca2+]i. We investigated the effects of nifedipine, 2-aminoethoxydiphenylborate (2-APB), gadolinium chloride hexahydrate (Gd3+), low calcium level and Krebs solution without calcium on the mepivacaine-evoked contraction in isolated rat aorta and on the mepivacaine-evoked [Ca2+]i increment in fura-2 loaded aortic strips. We assessed the effect of verapamil on the mepivacaine-evoked [Ca2+]i increment. Results Mepivacaine produced vasoconstriction and increased [Ca2+]i. Nifedipine, 2-APB and low calcium attenuated vasoconstriction and the [Ca2+]i increase evoked by mepivacaine. Verapamil attenuated the mepivacaine-induced [Ca2+]i increment. Calcium-free solution almost abolished mepivacaine-induced contraction and strongly attenuated the mepivacaineinduced [Ca2+]i increase. Gd3+ had no effect on either vasoconstriction or the [Ca2+]i increment evoked by mepivacaine. Conclusions The mepivacaine-evoked [Ca2+]i increment, which contributes to mepivacaine-evoked contraction, appears to be mediated mainly by calcium influx and partially by calcium released from the sarcoplasmic reticulum.
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Affiliation(s)
- Seong-Ho Ok
- Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju, Korea
| | - Seong-Chun Kwon
- Department of Physiology, Catholic Kwandong University College of Medicine, Gangneung, Korea
| | - Sebin Kang
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Korea
| | - Mun-Jeoung Choi
- Department of Oral and Maxillofacial Surgery, Gyeongsang National University Hospital, Jinju, Korea
| | - Ju-Tae Sohn
- Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju, Korea
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Ok SH, Bae SI, Kwon SC, Park JC, Kim WC, Park KE, Shin IW, Lee HK, Chung YK, Choi MJ, Sohn JT. Bupivacaine-induced Vasodilation Is Mediated by Decreased Calcium Sensitization in Isolated Endothelium-denuded Rat Aortas Precontracted with Phenylephrine. Korean J Pain 2014; 27:229-38. [PMID: 25031808 PMCID: PMC4099235 DOI: 10.3344/kjp.2014.27.3.229] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 03/17/2014] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND A toxic dose of bupivacaine produces vasodilation in isolated aortas. The goal of this in vitro study was to investigate the cellular mechanism associated with bupivacaine-induced vasodilation in isolated endotheliumdenuded rat aortas precontracted with phenylephrine. METHODS Isolated endothelium-denuded rat aortas were suspended for isometric tension recordings. The effects of nifedipine, verapamil, iberiotoxin, 4-aminopyridine, barium chloride, and glibenclamide on bupivacaine concentration-response curves were assessed in endothelium-denuded aortas precontracted with phenylephrine. The effect of phenylephrine and KCl used for precontraction on bupivacaine-induced concentration-response curves was assessed. The effects of verapamil on phenylephrine concentration-response curves were assessed. The effects of bupivacaine on the intracellular calcium concentration ([Ca(2+)]i) and tension in aortas precontracted with phenylephrine were measured simultaneously with the acetoxymethyl ester of a fura-2-loaded aortic strip. RESULTS Pretreatment with potassium channel inhibitors had no effect on bupivacaine-induced relaxation in the endothelium-denuded aortas precontracted with phenylephrine, whereas verapamil or nifedipine attenuated bupivacaine-induced relaxation. The magnitude of the bupivacaine-induced relaxation was enhanced in the 100 mM KCl-induced precontracted aortas compared with the phenylephrine-induced precontracted aortas. Verapamil attenuated the phenylephrine-induced contraction. The magnitude of the bupivacaine-induced relaxation was higher than that of the bupivacaine-induced [Ca(2+)]i decrease in the aortas precontracted with phenylephrine. CONCLUSIONS Taken together, these results suggest that toxic-dose bupivacaine-induced vasodilation appears to be mediated by decreased calcium sensitization in endothelium-denuded aortas precontracted with phenylephrine. In addition, potassium channel inhibitors had no effect on bupivacaine-induced relaxation. Toxic-dose bupivacaine- induced vasodilation may be partially associated with the inhibitory effect of voltage-operated calcium channels.
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Affiliation(s)
- Seong Ho Ok
- Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Sung Il Bae
- Department of Anesthesiology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
| | - Seong Chun Kwon
- Department of Physiology, Kwandong University College of Medicine, Gangneung, Korea
| | - Jung Chul Park
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Woo Chan Kim
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Kyeong Eon Park
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Il Woo Shin
- Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Heon Keun Lee
- Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Young Kyun Chung
- Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Mun Jeoung Choi
- Department of Oral and Maxillofacial Surgery, Gyeongsang National University Hospital, Jinju, Korea
| | - Ju Tae Sohn
- Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, Korea
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Razavi BM, Hosseinzadeh H, Abnous K, Imenshahidi M. Protective effect of crocin on diazinon induced vascular toxicity in subchronic exposure in rat aortaex-vivo. Drug Chem Toxicol 2014; 37:378-83. [DOI: 10.3109/01480545.2013.866139] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Baik JS, Sohn JT, Ok SH, Kim JG, Sung HJ, Park SS, Park JY, Hwang EM, Chung YK. Levobupivacaine-induced contraction of isolated rat aorta is calcium dependent. Can J Physiol Pharmacol 2011; 89:467-76. [PMID: 21812525 DOI: 10.1139/y11-046] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Levobupivacaine is a long-acting local anesthetic that intrinsically produces vasoconstriction in isolated vessels. The goals of this study were to investigate the calcium-dependent mechanism underlying levobupivacaine-induced contraction of isolated rat aorta in vitro and to elucidate the pathway responsible for the endothelium-dependent attenuation of levobupivacaine-induced contraction. Isolated rat aortic rings were suspended to record isometric tension. Cumulative levobupivacaine concentration-response curves were generated in either the presence or absence of the antagonists verapamil, nifedipine, SKF-96365, 2-aminoethoxydiphenylborate, Gd(3+), N(W)-nitro-l-arginine methyl ester (L-NAME), 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), and methylene blue, either alone or in combination. Verapamil, nifedipine, SKF-96365, 2-aminoethoxydiphenylborate, low calcium concentrations, and calcium-free Krebs solution attenuated levobupivacaine-induced contraction. Gd(3+) had no effect on levobupivacaine-induced contraction. Levobupivacaine increased intracellular calcium levels in vascular smooth muscle cells. L-NAME, ODQ, and methylene blue increased levobupivacaine-induced contraction in endothelium-intact aorta. SKF-96365 attenuated calcium-induced contraction in a previously calcium-free isotonic depolarizing solution containing 100 mmol/L KCl. Levobupivacaine-induced contraction of rat aortic smooth muscle is mediated primarily by calcium influx from the extracellular space mainly via voltage-operated calcium channels and, in part, by inositol 1,4,5-trisphosphate receptor-mediated release of calcium from the sarcoplasmic reticulum. The nitric oxide - cyclic guanosine monophosphate pathway is involved in the endothelium-dependent attenuation of levobupivacaine-induced contraction.
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Affiliation(s)
- Ji Seok Baik
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea
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Tom ENL, Girard C, Dimo T, Mbafor JT, Berthelot A, Demougeot C. Vasorelaxant effects of extracts of the stem bark of Terminalia superba Engler & Diels (Combretaceae). JOURNAL OF ETHNOPHARMACOLOGY 2010; 127:335-340. [PMID: 19897023 DOI: 10.1016/j.jep.2009.10.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2009] [Accepted: 10/29/2009] [Indexed: 05/28/2023]
Abstract
AIM OF THE STUDY The stem bark of Terminalia superba (Combretaceae) (TS) is used in traditional Cameroonian medicine as antihypertensive remedy. In the present study, we investigated the vasorelaxant properties of different extracts of TS and their underlying mechanisms. MATERIALS AND METHODS Activities of aqueous (AQU), methanolic (MET), methylene chloride (MC), and methylene chloride-methanol (MCM) extracts of TS were evaluated on isolated rat aortic rings precontracted with phenylephrine (PE) or high KCl. RESULTS All extracts induced a vasodilating effect both on KCl- and PE-induced contractions. The effects of MC and MCM extracts were greater than those of AQU or MET extracts (P<0.05). MC had an endothelium-independent effect and reduced Ca(++)-induced contraction following PE or KCl challenge (P<0.05). After incubation with verapamil, MC induced a relaxation in rings precontracted by PE (P<0.001). By contrast, the effect of MCM was endothelium-dependent and decreased by the nitric oxide synthase inhibitor N(W)-nitro-L-arginine methyl ester (P<0.05). CONCLUSIONS These data demonstrate that the MC extract exhibits vasorelaxant effects that are partly due to inhibition of extracellular Ca(++) influx and/or inhibition of intracellular Ca(++) release in vascular smooth muscle cells. By contrast, the effect of the MCM extract was found to be endothelium- and nitric oxide dependent.
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Affiliation(s)
- Esther Ngo Lemba Tom
- EA 4267 Sciences Séparatives, Biologiques et Pharmaceutiques, UFR des Sciences Médicales et Pharmaceutiques, 25030 Besançon, France
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Yousif MHM, Benter IF, Dunn KMJ, Dahly-Vernon AJ, Akhtar S, Roman RJ. Role of 20-hydroxyeicosatetraenoic acid in altering vascular reactivity in diabetes. ACTA ACUST UNITED AC 2009; 29:1-12. [PMID: 19302551 DOI: 10.1111/j.1474-8673.2009.00426.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
1 This study examined the role of 20-hydroxyeicosatetraenoic (20-HETE) in altering vascular function in streptozotocin (STZ)-induced diabetic rats. 2 The expression of CYP4A protein and the formation of 20-HETE were elevated in the kidney, but not in the renal or mesenteric vasculature, of diabetic animals. The vasoconstrictor responses to norepinephrine (NE), endothelin-1 (ET-1), and angiotensin II (Ang II) were significantly enhanced in the isolated perfused mesenteric vascular bed and renal artery segments of diabetic rats. Chronic treatment of the diabetic rats with 1-aminobenzotriazole (ABT, 50 mg kg(-1) alt(-1) diem) or N-hydroxy-N'-(4-butyl-2-methylphenyl) formamidine (HET0016, 2.5 mg kg(-1) day(-1)) attenuated the responses to these vasoconstrictors in both vascular beds. 3 The synthesis of 20-HETE in renal microsomes was reduced by >80% confirming that the doses of ABT and HET0016 were sufficient to achieve system blockade. Addition of HET0016 (1 microM) in vitro also normalized the enhanced vascular responsiveness of renal and mesenteric vessels obtained from diabetic animals to NE and inhibited the formation of 20-HETE by >90% while having no effect on the formation of epoxides. Vasodilator responses to carbachol and histamine were reduced in the mesenteric vasculature, but not in renal arteries, of diabetic rats. Treatment of the diabetic animals with HET0016 improved vasodilator responses in both vascular beds. Vascular sensitivity to exogenous 20-HETE was elevated in the mesenteric bed of diabetic animals compared to controls. 4 These results suggest that 20-HETE contributes to the elevation in vascular reactivity in diabetic animals. This effect is not due to increased vascular expression of CYP4A but may be related to either enhanced agonist-induced release of substrate (arachidonic acid) by the CaMKII/Ras-GTPase system and/or elevated vascular responsiveness to 20-HETE by the CaMKII/Ras-GTPase system and/or elevated vascular responsiveness to 20-HETE.
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Affiliation(s)
- M H M Yousif
- Department of Pharmacology & Toxicology, Kuwait University, Kuwait
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Naseri MKG, Arabian M, Badavi M, Ahangarpour A. Vasorelaxant and hypotensive effects of Allium cepa peel hydroalcoholic extract in rat. Pak J Biol Sci 2008; 11:1569-75. [PMID: 18819643 DOI: 10.3923/pjbs.2008.1569.1575] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The aim of present study was to investigate the effect of onion (Allium cepa) peel hydroalcoholic extract (OPE) on rat hypertension induced by high-fructose diet and aorta contractility. The OPE was prepared by maceration method using 70% ethanol. The thoracic aorta from male adult rat (Wistar) was dissected and suspended in Krebs-Henseleit solution under 1 g resting tension. Tissue preparation was contracted by KCl (80 mM) or phenylephrine (Phe, 1 microM) and then the extract was applied cumulatively (0.0625-2 mg mL(-1)). Hypertension was induced in negative control and three groups of rats by adding fructose (10% WN/V) in drinking water for 6 weeks but control group received tap water. Hypertensive groups received saline or OPE at 200, 400 and 800 mg kg(-1) daily for last 3 weeks by gavage. Results showed that OPE reduces aorta contractions induced by KCl or Phe in a concentration-dependent manner (p < 0.001). Removing aorta endothelium did not attenuate the OPE activity. Inhibition of nitric oxide, cGMP and prostaglandin synthesis by L-NAME (100 microM), methylene blue (10 microM) and indomethacin (10 microM), respectively, did not attenuate OPE activity. Atropine abolished ACh-induced relaxation in Phe precontracted aorta but not the OPE-induced relaxation. Although the extract did not change heart rate but after 3 weeks reduced the hypertension induced by fructose (p < 0.001). Present results indicated that OPE reduces aortic contractions possibly via inhibition of calcium influx but without involving NO, cGMP, endothelium and prostaglandins. The OPE hypotensive effect could be due to extract quercetin content, antioxidant activity and inhibiting vascular smooth muscle cells Ca2+ influx.
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Affiliation(s)
- Mohammad Kazem Gharib Naseri
- Physiology Research Center, Department of Physiology, School of Medicine, Ahwaz Jundishapur University of Medical Sciences, P.O. Box 61335-189, Ahwaz, Iran
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