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Lv H, Yu F, Sha C, Huang Y, Lu Y, Zhang L, Zhai R, Wang T, Fu F. Effects of rotigotine and rotigotine extended-release microsphere therapy on myocardial ischemic injury in mice. Eur J Pharm Sci 2019; 134:1-6. [DOI: 10.1016/j.ejps.2019.04.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 03/25/2019] [Accepted: 04/04/2019] [Indexed: 01/09/2023]
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Gao J, Zhang C, Gao F, Li H. The effect and mechanism of dopamine D1 receptors on the proliferation of osteosarcoma cells. Mol Cell Biochem 2017; 430:31-36. [PMID: 28181134 DOI: 10.1007/s11010-017-2951-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 01/17/2017] [Indexed: 12/19/2022]
Abstract
The physiological and pathological roles of dopamine D1 receptors (DR1) in the regulation of functions in tissues and organs have been recognized. However, whether DR1 are expressed in the osteosarcoma cells and inhibit the proliferation of these cells is unknown. In the present study, we found that DR1 were expressed in the osteosarcoma cells (OS732 cells). SKF-38393 (DR1 agonist) and the overexpression of DR1 decreased the proliferation of OS732 cells; SCH-23390 (DR1 antagonist) and the knockdown of DR1 increased the proliferation of OS732 cells, and both SCH-23390 and the knockdown of DR1 abolished the effect of SKF-38393 on the proliferation of OS732 cells. In addition, SKF-38393 down-regulated the phosphorylation of ERK1/2, PI3K, and Akt; SCH-23390 up-regulated the phosphorylation of ERK1/2, PI3K, and Akt, and SCH-23390 cancelled the effect of SKF-38393. The effect of SKF-38393 on the phosphorylation of ERK1/2, PI3K, and Akt and the proliferation of OS732 cells was similar to PD98059 (an ERK inhibitor) or LY294002 (a PI3K inhibitor), respectively. In conclusion, our results suggest that DR1 are expressed in the osteosarcoma cells and inhibit the proliferation of osteosarcoma cells by the down-regulation of the ERK1/2 and PI3K-Akt pathways. These findings provide a novel target for the treatment of the osteosarcoma.
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Affiliation(s)
- Jun Gao
- Department of Orthopeadic Surgery, The First Hospital of Harbin, Harbin, 150010, China
| | - Chao Zhang
- Department of Emergency, Heilongjiang Provincial Hospital, Harbin, 150036, China
| | - Feng Gao
- Department of Orthopaedic Surgery of Emergency, The Second Affiliated Hospital of Harbin Medical University, Harbin, 150081, China
| | - Hongzhu Li
- Department of Pathophysiology, Harbin Medical University, Baojian Road, Harbin, 150081, China.
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Wei C, Gao J, Li M, Li H, Wang Y, Li H, Xu C. Dopamine D2 receptors contribute to cardioprotection of ischemic post-conditioning via activating autophagy in isolated rat hearts. Int J Cardiol 2015; 203:837-9. [PMID: 26599746 DOI: 10.1016/j.ijcard.2015.11.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 11/03/2015] [Indexed: 11/27/2022]
Affiliation(s)
- Can Wei
- Department of Pathophysiology, Harbin Medical University, Harbin 150081, China
| | - Jun Gao
- Department of Orthopeadic Surgery, The First Hospital of Harbin, Harbin 150010, China
| | - Meixiu Li
- Department of Pathophysiology, Harbin Medical University, Harbin 150081, China
| | - Hong Li
- Department of Pathophysiology, Harbin Medical University, Harbin 150081, China
| | - Yuehong Wang
- Department of Pathophysiology, Harbin Medical University, Harbin 150081, China
| | - Hongzhu Li
- Department of Pathophysiology, Harbin Medical University, Harbin 150081, China.
| | - Changqing Xu
- Department of Pathophysiology, Harbin Medical University, Harbin 150081, China.
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Boyle SH, Matson WR, Velazquez EJ, Samad Z, Williams RB, Sharma S, Thomas B, Wilson JL, O'Connor C, Jiang W. Metabolomics analysis reveals insights into biochemical mechanisms of mental stress-induced left ventricular dysfunction. Metabolomics 2015; 11:571-582. [PMID: 25983674 PMCID: PMC4431771 DOI: 10.1007/s11306-014-0718-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Mental stress induced left ventricular dysfunction (LVD) has been associated with a greater risk of adverse events in coronary heart disease (CHD) patients independent of conventional risk indicators. The underlying biochemical mechanisms of this cardiovascular condition are poorly understood. Our objective was to use metabolomics technology to identify biochemical changes that co-occur with mental stress-induced LVD in patients with clinically stable CHD. Participants were adult CHD patients who were recruited for mental stress-induced myocardial ischemia screening. For this study, we randomly selected 30 patients representing the extremes of the mental stress-induced left ventricular ejection fraction (LVEF) change distribution; 15 who showed LVD (i.e. LVEF reduction ≥5) and 15 who showed a normal left ventricular response (NLVR; i.e. a LVEF increase of ≥5) to three mental stressors. An electrochemistry based metabolomics platform was used to profile pre- and post-stress serum samples yielding data for 22 known compounds, primarily within the tyrosine, tryptophan, purine and methionine pathways. There were significant stress-induced changes in several compounds. A comparison between the NLVR and LVD groups showed significant effects for kynurenine (p = .036, N-acetylserotonin (p = .054), uric acid (p = .015), tyrosine (p = .019) and a trend for methionine (p = .065); the NLVR group showed a significantly greater stress-induced reduction in all of those compounds compared to the LVD group. Many of these biochemicals have been implicated in other stress-related phenomena and are plausible candidates for mechanisms underlying LVD in response to mental stress.
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Affiliation(s)
- Stephen H. Boyle
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 3366, Durham, NC 27710, USA
| | - Wayne R. Matson
- Department of Systems Biochemistry, Counterpoint Health Solutions Inc, Bedford, MA, USA
| | - Eric J. Velazquez
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - Zainab Samad
- Department of Medicine, Duke University Medical Center, Durham, NC, USA
| | - Redford B. Williams
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 3366, Durham, NC 27710, USA
| | - Swati Sharma
- Department of Systems Biochemistry, Counterpoint Health Solutions Inc, Bedford, MA, USA
| | - Beena Thomas
- Department of Systems Biochemistry, Counterpoint Health Solutions Inc, Bedford, MA, USA
| | - Jennifer L. Wilson
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 3366, Durham, NC 27710, USA
| | | | - Wei Jiang
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Box 3366, Durham, NC 27710, USA, Department of Medicine, Duke University Medical Center, Durham, NC, USA
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5
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Li H, Wei C, Gao J, Bai S, Li H, Zhao Y, Li H, Han L, Tian Y, Yang G, Wang R, Wu L, Xu C. Mediation of dopamine D2 receptors activation in post-conditioning-attenuated cardiomyocyte apoptosis. Exp Cell Res 2014; 323:118-130. [DOI: 10.1016/j.yexcr.2013.12.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 12/18/2013] [Accepted: 12/31/2013] [Indexed: 02/08/2023]
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6
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Gao J, Guo J, Li H, Bai S, Li H, Wu B, Wang L, Xi Y, Tian Y, Yang G, Wang R, Wu L, Xu C, Li H. Involvement of dopamine D2 receptors activation in ischemic post-conditioning-induced cardioprotection through promoting PKC-ε particulate translocation in isolated rat hearts. Mol Cell Biochem 2013; 379:267-76. [DOI: 10.1007/s11010-013-1648-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 04/11/2013] [Indexed: 11/30/2022]
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Li HZ, Guo J, Gao J, Han LP, Jiang CM, Li HX, Bai SZ, Zhang WH, Li GW, Wang LN, Li H, Zhao YJ, Lin Y, Tian Y, Yang GD, Wang R, Wu LY, Yang BF, Xu CQ. Role of dopamine D2 receptors in ischemia/reperfusion induced apoptosis of cultured neonatal rat cardiomyocytes. J Biomed Sci 2011; 18:18. [PMID: 21324201 PMCID: PMC3050795 DOI: 10.1186/1423-0127-18-18] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Accepted: 02/16/2011] [Indexed: 11/25/2022] Open
Abstract
Background Myocardial ischemia/reperfusion injury is the major cause of morbidity and mortality for cardiovascular diseases. Dopamine D2 receptors are expressed in cardiac tissues. However, the roles of dopamine D2 receptors in myocardial ischemia/reperfusion injury and cardiomyocyte apoptosis are unclear. Here we investigated the effects of both dopamine D2 receptors agonist (bromocriptine) and antagonist (haloperidol) on apoptosis of cultured neonatal rat ventricular myocytes induced by ischemia/reperfusion injury. Methods Myocardial ischemia/reperfusion injury was simulated by incubating primarily cultured neonatal rat cardiomyocytes in ischemic (hypoxic) buffer solution for 2 h. Thereafter, these cells were incubated for 24 h in normal culture medium. Results Treatment of the cardiomyocytes with 10 μM bromocriptine significantly decreased lactate dehydrogenase activity, increased superoxide dismutase activity, and decreased malondialdehyde content in the culture medium. Bromocriptine significantly inhibited the release of cytochrome c, accumulation of [Ca2+]i, and apoptosis induced by ischemia/reperfusion injury. Bromocriptine also down-regulated the expression of caspase-3 and -9, Fas and Fas ligand, and up-regulated Bcl-2 expression. In contrast, haloperidol (10 μM) had no significant effects on the apoptosis of cultured cardiomyocytes under the aforementioned conditions. Conclusions These data suggest that activation of dopamine D2 receptors can inhibit apoptosis of cardiomyocytes encountered during ischemia/reperfusion damage through various pathways.
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Affiliation(s)
- Hong-zhu Li
- Department of Pathophysiology, Harbin Medical University, Harbin, PR China
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IMANI ALIREZA, FAGHIHI MAHDIEH, SADR SAYYEDSHAHABEDDIN, KESHAVARZ MANSOOR, NIARAKI SOMAYEHSADEGHI. Noradrenaline Reduces Ischemia-Induced Arrhythmia in Anesthetized Rats: Involvement of α1-Adrenoceptors and Mitochondrial KATPChannels. J Cardiovasc Electrophysiol 2008; 19:309-15. [DOI: 10.1111/j.1540-8167.2007.01031.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Li HZ, Han LP, Jiang CM, Li H, Zhao YJ, Gao J, Lin Y, Ma SX, Tian Y, Yang BF, Xu CQ. Effect of Dopamine Receptor 1 on Apoptosis of Cultured Neonatal Rat Cardiomyocytes in Simulated Ischaemia/Reperfusion. Basic Clin Pharmacol Toxicol 2008; 102:329-36. [DOI: 10.1111/j.1742-7843.2007.00177.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rossoni G, Manfredi B, Cavalca V, Razzetti R, Bongrani S, Polvani GL, Berti F. The aminotetraline derivative (+/-)-(R,S)-5,6-dihydroxy-2-methylamino-1,2,3,4-tetrahydro-naphthalene hydrochloride (CHF-1024) displays cardioprotection in postischemic ventricular dysfunction of the rat heart. J Pharmacol Exp Ther 2003; 307:633-9. [PMID: 12975493 DOI: 10.1124/jpet.103.054700] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
To analyze the protective effects of the aminotetraline derivative (+/-)-(R,S)-5,6-dihydroxy-2-methylamino-1,2,3,4-tetrahydro-naphthalene hydrochloride (CHF-1024), a compound endowed with DA2-dopaminergic/alpha2-adrenergic receptor agonistic activity, in myocardial ischemia/reperfusion damage. A model of isolated and perfused (15 ml/min) electrically driven (300 beats/min) rat heart subjected to global ischemia (1 ml/min for 20 min) and reperfusion (15 ml/min for 30 min) was followed. Cardiac mechanics changes were evaluated together with biochemical markers of cardiac ischemia in perfusate and tissue tumor necrosis factor-alpha (TNF-alpha). CHF-1024, perfused through the heart for 15 min before ischemia at different molar concentrations (1-100 nM), significantly improved left ventricle developed pressure during reperfusion, and normalized left ventricular end-diastolic pressure and coronary perfusion pressure. This anti-ischemic effect of CHF-1024 was associated to a decrease in creatine kinase and lactate dehydrogenase, both released during heart reperfusion. These events were concomitant with maintenance of a higher production of 6-keto-prostaglandin F1alpha The ability of CHF-1024 to improve postischemic ventricular dysfunction was correlated with a dose-dependent inhibition of the release of both norepinephrine (NE), from sympathetic nerve endings, and TNF-alpha from cardiac tissue. The effect of CHF-1024 on NE release was almost completely antagonized by specific antagonists of presynaptic inhibitory receptors domperidone and rauwolscine. The finding that this new aminotetraline derivative possesses anti-ischemic properties and limits NE release from cardiac nerve endings may bear some therapeutic potential in cardiovascular diseases.
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Affiliation(s)
- Giuseppe Rossoni
- Department of Pharmacology, Chemotherapy and Medical Toxicology, University of Milan, Via Vanvitelli 32, 20129 Milan, Italy.
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Glaser S, Alvaro D, Roskams T, Phinizy JL, Stoica G, Francis H, Ueno Y, Barbaro B, Marzioni M, Mauldin J, Rashid S, Mancino MG, LeSage G, Alpini G. Dopaminergic inhibition of secretin-stimulated choleresis by increased PKC-gamma expression and decrease of PKA activity. Am J Physiol Gastrointest Liver Physiol 2003; 284:G683-94. [PMID: 12505882 DOI: 10.1152/ajpgi.00302.2002] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
To determine the role and mechanisms of action by which dopaminergic innervation modulates ductal secretion in bile duct-ligated rats, we determined the expression of D1, D2, and D3 dopaminergic receptors in cholangiocytes. We evaluated whether D1, D2 (quinelorane), or D3 dopaminergic receptor agonists influence basal and secretin-stimulated choleresis and lumen expansion in intrahepatic bile duct units (IBDU) and cAMP levels in cholangiocytes in the absence or presence of BAPTA-AM, chelerythrine, 1-(5-isoquinolinylsulfonyl)-2-methyl piperazine (H7), or rottlerin. We evaluated whether 1) quinelorane effects on ductal secretion were associated with increased expression of Ca(2+)-dependent PKC isoforms and 2) increased expression of PKC causes inhibition of PKA activity. Quinelorane inhibited secretin-stimulated choleresis in vivo and IBDU lumen space, cAMP levels, and PKA activity in cholangiocytes. The inhibitory effects of quinelorane on secretin-stimulated ductal secretion and PKA activity were blocked by BAPTA-AM, chelerythrine, and H7. Quinelorane effects on ductal secretion were associated with activation of the Ca(2+)-dependent PKC-gamma but not other PKC isoforms. The dopaminergic nervous system counterregulates secretin-stimulated ductal secretion in experimental cholestasis.
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Affiliation(s)
- Shannon Glaser
- Department of Internal Medicine, Texas A&M University System Health Sciences Center, College of Medicine, Temple, Texas 76504, USA
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Babai L, Papp JG, Parratt JR, Végh Á. The antiarrhythmic effects of ischaemic preconditioning in anaesthetized dogs are prevented by atropine; role of changes in baroreceptor reflex sensitivity. Br J Pharmacol 2002; 135:55-64. [PMID: 11786480 PMCID: PMC1573109 DOI: 10.1038/sj.bjp.0704445] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
1. Dogs, anaesthetized with chloralose and urethane, were subjected to a 25 min occlusion of the left anterior descending coronary artery. This resulted in ventricular ectopic activity, a reduction in baroreflex sensitivity (BRS, measured following the intravenous administration of phenylephrine), elevations in the epicardial ST-segment and increases in the degree of inhomogeneity of electrical activation, both measured from the ischaemic region of the left ventricular wall. 2. These changes were markedly reduced when the 25 min occlusion was preceded, 20 min earlier, by a 5 min (preconditioning) occlusion of the same coronary artery (e.g. VF during ischaemia reduced from 40% in the controls to 0%; P<0.05; BRS increased from 1.22+/-0.23 pre-occlusion to 1.61+/-0.25 mmHg ms(-1) post-occlusion in preconditioned dogs; cf. 1.28+/-0.29 to 0.45+/-0.12 mmHg ms(-1) respectively in the controls, P<0.05). 3. These beneficial effects of preconditioning were prevented by the administration, 10 min prior to the 25 min coronary artery occlusion, of atropine (1 mg kg(-1) i.v. followed by a continuous infusion of 0.04 mg kg(-1) h(-1)). For example, VF during occlusion was increased from 0% in the preconditioned dogs to 40% (P<0.05) in the presence of atropine and BRS was again reduced during occlusion (from 1.75+/-0.29 to 0.30+/-0.08 mmHg ms(-1); P<0.05). 4. We conclude that preconditioning reduces arrhythmia severity during ischaemia by favourably modifying cardiac autonomic receptor mechanism through enhancing vagal influences.
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Affiliation(s)
- László Babai
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
| | - Julius Gy Papp
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
- Research Unit for Cardiovascular Pharmacology, Hungarian Academy of Sciences, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
| | - James R Parratt
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
- Department of Physiology and Pharmacology, Strathclyde Institute for Biomedical Sciences, 27 Taylor Street, Glasgow G4 0NR
| | - Ágnes Végh
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Albert Szent-Györgyi Faculty of Medicine, Dóm tér 12, P.O. Box 427, H-6701 Hungary
- Author for correspondence:
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Dumont M, Lemaire S. Interactions of dynorphin A-(1-13) and nociceptin with cardiac D2 binding sites: inhibition of ischemia-evoked release of noradrenaline from synaptosomal-mitochondrial fractions. J Mol Cell Cardiol 2000; 32:1567-74. [PMID: 10900181 DOI: 10.1006/jmcc.2000.1192] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The effect of dynorphin A (Dyn A)-related peptides and nociceptin on the binding of the D2 receptor antagonist, [(3)H]raclopride, was examined in membrane preparations of rat heart. Non-linear regression saturation binding analysis of [(3)H]raclopride binding revealed the presence of a single high-affinity binding site with a K(d)of 4.1 n M and a B(max)of 220 fmol/mg protein. The D2 stereospecificity of [(3)H]raclopride binding was demonstrated by competition experiments using two enantiomer pairs of antagonists. (+)-Butaclamol (IC(50): 8.0 n M) and (-)-sulpiride (IC(50): 112.3 n M) were 27 000 and 24 times more potent than (-)-butaclamol (IC(50): >100 microm) and (+)-sulpiride (IC(50): 2666 n M), respectively. Nociceptin and Dyn A-(1-13) were also potent inhibitors of the binding of [3H]raclopride with shallow inhibition curves that fitted best with two sites model. Their order of potency on the low affinity site [alpha -Neo-endorphin>nociceptin>Dyn A-(2-13)>Dyn A-(1-13)>Dyn B>Dyn A-(6-10)] correlated well with their ability to inhibit the binding of [3H]nociceptin (r=0.82). The indirect nature of the inhibitory effects of the peptides on the D2 receptor was demonstrated by their inability to inhibit [(3)H]raclopride binding to a membrane preparation (Sf9 cells transfected with the human D2(long)receptor) that does not contain the ORL(1)receptor and the lack of effect of raclopride (0.1 n M-10 microm) on both [(3)H]nociceptin and [(3)H]Dyn A-(1-13) binding. Isolated cardiac mitochondrial-synaptosomal fractions submitted to ischemic conditions (1 m M iodoacetate +2 m M NaCN, 5 min at 37 degrees C) released 10.9% of their content in preloaded [(3)H]noradrenaline ([(3)H]NA). Dyn A-(1-13) (10 microm), nociceptin (10 microm) and the selective D2 receptor agonist, quinpirole (10 microm) were potent blockers of the release of [(3)H]NA evoked by the ischemic conditions. The inhibitory effect of Dyn A-(1-13), nociceptin and quinpirole were antagonized by the selective D2 receptor antagonist, raclopride (10 microm); whereas naloxone, at a concentration (1 microm) known to affect the ORL(1)receptor, blocked the effects of the peptides but not those of quinpirole. The results demonstrate the presence of D2 receptors in rat heart and suggest that Dyn A-(1-13) and nociceptin modulate ischemia-induced NA release by a mechanism that involves the participation of both ORL(1)and D2 receptors.
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Affiliation(s)
- M Dumont
- Department of Molecular and Cellular Medicine, Faculty of Medicine, University of Ottawa, 451 Smyth Road, Ottawa, Ontario, K1H 8M5, Canada
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Teisman AC, Buikema H, van Veldhuisen DJ, de Zeeuw D, van Gilst WH. Direct vasodilating effects of the new dopaminergic agonist Z1046 in human arteries. J Cardiovasc Pharmacol 2000; 35:581-5. [PMID: 10774789 DOI: 10.1097/00005344-200004000-00011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Dopaminergic agonists remain of interest in the treatment of heart failure; however, concomitant stimulation of alpha- and beta-receptors should be avoided. This study evaluates the dopaminergic and adrenergic (vasodilating) properties of Z1046, epinine (the active metabolite of ibopamine), and dopamine. Isotonic contraction experiments were performed on human internal mammary artery rings in vitro. alpha1-Antagonistic effects of Z1046 were demonstrated by performing cumulative dose-response curves with the selective alpha1-agonist phenylephrine in the presence of Z1046. Furthermore, both alpha1- and dopamine-mediated receptor effects of Z1046, epinine, and dopamine were studied by performing cumulative dose-response relations both at baseline and in precontracted artery rings both with and without the D1-like antagonist SCH23390. In contrast to both epinine and dopamine, Z1046 is devoid of alpha1-receptor-mediated contraction. Furthermore, Z1046, epinine, and dopamine induced direct dopamine receptor-mediated vasodilation when interfering alpha1 effects were blocked. In contrast to epinine and dopamine, Z1046 is devoid of vasoconstricting properties at higher dosages. Because of its D1-like agonistic and alpha1-antagonistic properties, Z1046 is an effective vasodilator in the whole dosage range. Because of its total receptor profile, Z1046 appears to be more favorable for treatment of heart failure than is ibopamine.
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Affiliation(s)
- A C Teisman
- Department of Clinical Pharmacology, University of Groningen, The Netherlands.
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