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Wani SA, Khan LA, Basir SF. Cobalt-Induced Hypercontraction is Mediated by Generationof Reactive Oxygen Species and Influx of Calcium in Isolated RatAorta. Biol Trace Elem Res 2020; 196:110-118. [PMID: 31520195 DOI: 10.1007/s12011-019-01890-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Accepted: 08/29/2019] [Indexed: 10/26/2022]
Abstract
To investigate the mechanism of cobalt-mediated phenylephrine (PE)-induced contraction in endothelium-intact isolated Wistar rat aortic rings. Effect of dose-dependent concentrations of cobalt on PE-induced contraction was investigated in isolated Wistar rat aortic rings using an organ bath system. Aortic rings were pre-incubated with verapamil (1 μM and 20 μM), gadolinium, apocynin, indomethacin or N-G-nitro-L-arginine methyl ester (L-NAME) separately before incubation with cobalt. Endothelium-intact aortic rings were incubated with 800 nM, 1 μM, 10 μM, 50 μM cobalt; we observed 20%, 22%, 32% and 27% increased contractions respectively, while no effect was seen in tension recording on cobalt exposure. Incubation of endothelium-intact aortic rings with 100 μM apocynin and 100 μM L-NAME suggested the role of NADPH oxidase in generation of reactive oxygen species (ROS) and decrease in bioavailability of nitric oxide (NO) from eNOS on exposure to cobalt. Aortic rings pre-incubated with 1 μM and 20 μM verapamil suggested role of both L-type and T-type calcium channels in influx of extracellular calcium in smooth muscle cells. We observed no role of store-operated calcium channels (SOCC) in calcium influx due to cobalt exposure and cyclooxygenase in generation of prostanoids in isolated aortic rings. Cobalt caused rise of PE-induced contractions as a result of the endothelial generation of ROS, by decreasing bioavailability of NO. Generation of ROS may be responsible for causing the influx of extracellular calcium through L-type and T-type Ca2+ channels in smooth muscle cells.
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Affiliation(s)
| | - Luqman Ahmad Khan
- Department of Biosciences, Jamia Millia Islamia, New Delhi, 110025, India
| | - Seemi Farhat Basir
- Department of Biosciences, Jamia Millia Islamia, New Delhi, 110025, India.
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Wani SA, Khan LA, Basir SF. Role of calcium channels and endothelial factors in nickel induced aortic hypercontraction in Wistar rats. J Smooth Muscle Res 2019; 54:71-82. [PMID: 30210089 PMCID: PMC6135920 DOI: 10.1540/jsmr.54.71] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Aim: To investigate the mechanism of nickel augmented phenylephrine
(PE)-induced contraction in isolated segments of Wistar rat aorta. Materials and
Methods: Effect of varying concentrations of nickel on PE-induced contraction
were investigated in isolated segments of Wistar rat aorta using an organ bath system.
Aortic rings were pre-incubated with verapamil (1 µM and 20 µM), gadolinium, apocynin,
indomethacin or N-G-nitro-L-arginine methyl ester (L-NAME) separately before incubation
with nickel. Results: Endothelium intact aortic rings incubated with 100
nM, 1 µM or 100 µM of nickel exhibited 80%, 43% and 28% increase in PE-induced
contraction, respectively, while no such enhancing responses were observed in endothelium
denuded aorta. Incubation of aortic rings with 1 µM and 20 µM verapamil suggested an
involvement of influx of calcium through T-type calcium channels in smooth muscle cells,
while aortic rings pre-incubated with gadolinium showed no role of store operated calcium
channels in the nickel effect on PE-induced contractions. The enhancing effect of nickel
on PE-induced contractions was inhibited by apocynin, indomethacin or L-NAME.
Conclusion: Nickel has caused augmentation of PE-induced contractions
as a result of the endothelial generation of reactive oxygen species (ROS) and
cyclooxygenase 2 (COX2) dependent endothelium contracting factors (EDCFs), which increases
the influx of extracellular calcium through T-type Ca2+ channels in smooth
muscle cells.
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Affiliation(s)
| | - Luqman Ahmad Khan
- Department of Biosciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Seemi Farhat Basir
- Department of Biosciences, Jamia Millia Islamia, New Delhi 110025, India
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Simonovic N, Jakovljevic V, Jeremic J, Finderle Z, Srejovic I, Nikolic Turnic T, Milosavljevic I, Zivkovic V. Comparative effects of calcium and potassium channel modulators on ischemia/reperfusion injury in the isolated rat heart. Mol Cell Biochem 2018; 450:175-185. [DOI: 10.1007/s11010-018-3384-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/16/2018] [Indexed: 12/28/2022]
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Byon HJ, Ok SH, Lee SH, Kang S, Cho Y, Han JY, Sohn JT. Dexmedetomidine Inhibits Phenylephrine-induced Contractions via Alpha-1 Adrenoceptor Blockade and Nitric Oxide Release in Isolated Rat Aortae. Int J Med Sci 2017; 14:143-149. [PMID: 28260990 PMCID: PMC5332843 DOI: 10.7150/ijms.17456] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Accepted: 12/21/2016] [Indexed: 12/16/2022] Open
Abstract
The goal of this in vitro study was to examine the effect of the alpha-2 adrenoceptor agonist dexmedetomidine on phenylephrine (alpha-1 adrenoceptor agonist)-induced contraction in isolated rat aortae and to elucidate the associated cellular mechanisms, with a particular focus on alpha-1 adrenoceptor antagonism. Dexmedetomidine dose-response curves were generated in isolated endothelium-intact and endothelium-denuded rat aortae precontracted with phenylephrine or 5-hydroxytryptamine. Endothelium-denuded aortic rings were pretreated with either dexmedetomidine or the reversible alpha-1 adrenoceptor antagonist phentolamine, followed by post-treatment with the irreversible alpha-1 adrenoceptor blocker phenoxybenzamine. Control rings were treated with phenoxybenzamine alone. All rings were repeatedly washed with Krebs solution to remove all pretreatment drugs, including phenoxybenzamine, phentolamine and dexmedetomidine. Phenylephrine dose-response curves were then generated. The effect of rauwolscine on the dexmedetomidine-mediated change in phenylephrine-induced endothelial nitric oxide synthase (eNOS) phosphorylation in human umbilical vein endothelial cells was examined using western blotting. The magnitude of the dexmedetomidine-mediated inhibition of phenylephrine-induced contraction was higher in endothelium-intact aortae than in endothelium-denuded aortae or endothelium-intact aortae treated with Nω-nitro-L-arginine methyl ester. However, dexmedetomidine did not significantly alter 5-hydroxytryptamine-induced contraction. In further experiments, prazosin attenuated dexmedetomidine-induced contraction. Additionally, pretreatment with either dexmedetomidine plus phenoxybenzamine or phentolamine plus phenoxybenzamine produced greater phenylephrine-induced contraction than phenoxybenzamine alone, suggesting that dexmedetomidine protects aortae from the alpha-1 adrenoceptor blockade induced by phenoxybenzamine. Rauwolscine attenuated the dexmedetomidine-mediated enhancement of phenylephrine-induced eNOS phosphorylation. Taken together, these results suggest that dexmedetomidine attenuates phenylephrine-induced contractions via alpha-1 adrenoceptor blockade and endothelial nitric oxide release in the isolated rat aorta.
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Affiliation(s)
- Hyo-Jin Byon
- Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Seong-Ho Ok
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, 52727, Republic of Korea
| | - Soo Hee Lee
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, 52727, Republic of Korea
| | - Sebin Kang
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, 52727, Republic of Korea
| | - Youngil Cho
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, 52727, Republic of Korea
| | - Jeong Yeol Han
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Changwon Hospital, Changwon, 51427, Republic of Korea
| | - Ju-Tae Sohn
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, 52727, Republic of Korea;; Institute of Health Sciences, Gyeongsang National University, Jinju-si, Republic of Korea
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Stojic I, Srejovic I, Zivkovic V, Jeremic N, Djuric M, Stevanovic A, Milanovic T, Djuric D, Jakovljevic V. The effects of verapamil and its combinations with glutamate and glycine on cardiodynamics, coronary flow and oxidative stress in isolated rat heart. J Physiol Biochem 2016; 73:141-153. [PMID: 27812957 DOI: 10.1007/s13105-016-0534-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 10/24/2016] [Indexed: 12/28/2022]
Abstract
The role of N-methyl-D-aspartate receptor (NMDA-R) in heart is still unclear. For these ionotropic glutamate receptors is characteristic the necessity of both co-agonists, glutamate and glycine, for their activation, which primarily allows influx of calcium. The aim of the present study was to examine the effects of verapamil, as a calcium channel blocker, alone and its combination with glycine and/or glutamate on cardiac function, coronary flow, and oxidative stress in isolated rat heart or to examine the effects of potential activation of NMDA-R in isolated rat heart. The hearts of male Wistar albino rats were excised and perfused according to Langendorff technique, and cardiodynamic parameters and coronary flow were determined during the administration of verapamil and its combinations with glutamate and/or glycine. The oxidative stress biomarkers, including thiobarbituric acid-reactive substances, nitrites, superoxide anion radical, and hydrogen peroxide, were each determined spectrophotometrically from coronary venous effluent. The greatest decline in parameters of cardiac contractility and systolic pressure was in the group that was treated with verapamil only, while minimal changes were observed in group treated with all three tested substances. Also, the largest changes in coronary flow were in the group treated only with verapamil, and at least in the group that received all three tested substances, as well as the largest increase in oxidative stress parameters. Based on the obtained results, it can be concluded that NMDA-R activation allows sufficient influx of calcium to increase myocardial contractility and systolic pressure, as well as short-term increase of oxidative stress.
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Affiliation(s)
- Isidora Stojic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Ivan Srejovic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Vladimir Zivkovic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Nevena Jeremic
- Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Marko Djuric
- University Clinical Hospital Center "Dr Dragisa Misovic", University of Belgrade, Belgrade, Serbia
| | - Ana Stevanovic
- University Clinical Hospital Center "Dr Dragisa Misovic", University of Belgrade, Belgrade, Serbia
| | - Tamara Milanovic
- Department of Biochemistry, Faculty of Medicine, University of Prishtina/Kosovska Mitrovica, Kosovska Mitrovica, Serbia
| | - Dragan Djuric
- Institute of Medical Physiology "Richard Burian," Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Vladimir Jakovljevic
- Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.
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Dexmedetomidine-Induced Contraction Involves CPI-17 Phosphorylation in Isolated Rat Aortas. Int J Mol Sci 2016; 17:ijms17101663. [PMID: 27706026 PMCID: PMC5085696 DOI: 10.3390/ijms17101663] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 09/17/2016] [Accepted: 09/26/2016] [Indexed: 12/03/2022] Open
Abstract
Dexmedetomidine, a highly selective α-2 adrenoceptor agonist, produces vasoconstriction, which leads to transiently increased blood pressure. The goal of this study was to investigate specific protein kinases and the associated cellular signal pathways responsible for the increased calcium sensitization induced by dexmedetomidine in isolated rat aortas, with a particular focus on phosphorylation-dependent inhibitory protein of myosin phosphatase (CPI-17). The effect of Y-27632 and chelerythrine on the dexmedetomidine-induced intracellular calcium concentration ([Ca2+]i) and tension were assessed using fura-2-loaded aortic strips. The effects of rauwolscine, Y-27632, chelerythrine, and ML-7 hydrochloride on the dexmedetomidine-induced phosphorylation of CPI-17 or of the 20-kDa regulatory light chain of myosin (MLC20) were investigated in rat aortic vascular smooth muscle cells. The effects of rauwolscine, Y-27632, and chelerythrine on the membrane translocation of Rho-kinase and protein kinase C (PKC) phosphorylation induced by dexmedetomidine were assessed. Y-27632 and chelerythrine each reduced the slopes of the [Ca2+]i-tension curves of dexmedetomidine-induced contraction, and Y-27632 more strongly reduced these slopes than did chelerythrine. Rauwolscine, Y-27632, chelerythrine, and ML-7 hydrochloride attenuated the dexmedetomidine-induced phosphorylation of CPI-17 and MLC20. Taken together, these results suggest that dexmedetomidine-induced contraction involves calcium sensitization, which appears to be mediated by CPI-17 phosphorylation via Rho-kinase or PKC.
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Cho H, Ok SH, Kwon SC, Lee SH, Baik J, Kang S, Oh J, Sohn JT. Lipid emulsion inhibits vasodilation induced by a toxic dose of bupivacaine by suppressing bupivacaine-induced PKC and CPI-17 dephosphorylation but has no effect on vasodilation induced by a toxic dose of mepivacaine. Korean J Pain 2016; 29:229-238. [PMID: 27738501 PMCID: PMC5061639 DOI: 10.3344/kjp.2016.29.4.229] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 07/10/2016] [Accepted: 07/17/2016] [Indexed: 12/05/2022] Open
Abstract
Background The goal of this in vitro study was to investigate the effect of lipid emulsion on vasodilation caused by toxic doses of bupivacaine and mepivacaine during contraction induced by a protein kinase C (PKC) activator, phorbol 12,13-dibutyrate (PDBu), in an isolated endothelium-denuded rat aorta. Methods The effects of lipid emulsion on the dose-response curves induced by bupivacaine or mepivacaine in an isolated aorta precontracted with PDBu were assessed. In addition, the effects of bupivacaine on the increased intracellular calcium concentration ([Ca2+]i) and contraction induced by PDBu were investigated using fura-2 loaded aortic strips. Further, the effects of bupivacaine, the PKC inhibitor GF109203X and lipid emulsion, alone or in combination, on PDBu-induced PKC and phosphorylation-dependent inhibitory protein of myosin phosphatase (CPI-17) phosphorylation in rat aortic vascular smooth muscle cells (VSMCs) was examined by western blotting. Results Lipid emulsion attenuated the vasodilation induced by bupivacaine, whereas it had no effect on that induced by mepivacaine. Lipid emulsion had no effect on PDBu-induced contraction. The magnitude of bupivacaine-induced vasodilation was higher than that of the bupivacaine-induced decrease in [Ca2+]i. PDBu promoted PKC and CPI-17 phosphorylation in aortic VSMCs. Bupivacaine and GF109203X attenuated PDBu-induced PKC and CPI-17 phosphorylation, whereas lipid emulsion attenuated bupivacaine-mediated inhibition of PDBu-induced PKC and CPI-17 phosphorylation. Conclusions These results suggest that lipid emulsion attenuates the vasodilation induced by a toxic dose of bupivacaine via inhibition of bupivacaine-induced PKC and CPI-17 dephosphorylation. This lipid emulsion-mediated inhibition of vasodilation may be partly associated with the lipid solubility of local anesthetics.
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Affiliation(s)
- Hyunhoo Cho
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju, Korea
| | - Seong Ho Ok
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju, Korea
| | - Seong Chun Kwon
- Department of Physiology, Institute for Clinical and Translational Research, Catholic Kwangdong University College of Medicine, Gangneung, Korea
| | - Soo Hee Lee
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Jiseok Baik
- Department of Anesthesiology and Pain Medicine, Pusan National University Hospital, Biomed Research Institute, Pusan National University School of Medicine, Busan, Korea
| | - Sebin Kang
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Jiah Oh
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Ju-Tae Sohn
- Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, Jinju, Korea.; Institute of Health Sciences, Gyeongsang National University, Jinju, Korea
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