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Britto-Júnior J, Ximenes L, Ribeiro A, Fregonesi A, Campos R, Ricardo de Almeida Kiguti L, Mónica FZ, Antunes E, De Nucci G. 6-Nitrodopamine is an endogenous mediator of rat isolated epididymal vas deferens contractions induced by electric-field stimulation. Eur J Pharmacol 2021; 911:174544. [PMID: 34606837 DOI: 10.1016/j.ejphar.2021.174544] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 09/22/2021] [Accepted: 09/29/2021] [Indexed: 01/12/2023]
Abstract
6-nitrodopamine (6-ND) is released from human umbilical cord vessels and modulates vascular reactivity by acting as a dopamine antagonist. Here we investigate whether 6-ND is released by the rat isolated vas deferens and its effect on this tissue. Dopamine, noradrenaline, adrenaline and 6-ND levels were quantified in rat isolated vas deferens by LC-MS-MS. Electric-field stimulation (EFS) and concentration-response curves to 6-ND, noradrenaline, dopamine and adrenaline were performed in the absence and in the presence (30 min) of L-NAME, SCH-23390, haloperidol, PG-01037, sonepiprazole, desipramine, clomipramine, amitriptyline, cyclobenzaprine, carbamazepine, maprotiline, paroxetine, oxcarbazepine and ketanserin in the rat isolated epididymal vas deferens (RIEVD). Basal releases of 6-ND and noradrenaline were detected from the rat isolated vas deferens. 6-ND release was reduced by tissue incubation with L-NAME and from the vas deferens obtained from L-NAME-treated rats. SCH-23390 caused leftward shifts on concentration-response curves to 6-ND without affecting dopamine- or EFS-induced RIEVD contractions. Haloperidol, PG-01037 and sonepiprazole caused significant rightward shifts on concentration-response curves to dopamine but had no effect on either the 6-ND or EFS-induced RIEVD contractions. The tricyclic compounds desipramine, clomipramine, amitriptyline, cyclobenzaprine and carbamazepine induced rightward shifts on 6-ND concentration-response curve but did not reduce the noradrenaline, dopamine and adrenaline contractile responses. They also reduced the EFS-induced RIEVD contractions in control but not in tissues obtained from L-NAME-treated animals. Maprotiline, oxcarbazepine, paroxetine and ketanserin had no effect in either 6-ND or EFS-induced RIEVD contractions. Thus, 6-ND modulates RIEVD contractility, and desipramine, clomipramine, amitriptyline, cyclobenzaprine and carbamazepine act as selective 6-ND receptor antagonists.
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Affiliation(s)
- José Britto-Júnior
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Campinas, Brazil.
| | - Luiz Ximenes
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Campinas, Brazil
| | - André Ribeiro
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Campinas, Brazil
| | - Adriano Fregonesi
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Campinas, Brazil
| | - Rafael Campos
- Clinical Pharmacology Unit, Drug Research and Development Center, Federal University of Ceará (UFC), Fortaleza, CE, Brazil; Superior Institute of Biomedical Sciences, Ceará State University (UECE), Fortaleza, Brazil
| | | | - Fabíola Z Mónica
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Campinas, Brazil
| | - Edson Antunes
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Campinas, Brazil
| | - Gilberto De Nucci
- Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Campinas, Brazil; Clinical Pharmacology Unit, Drug Research and Development Center, Federal University of Ceará (UFC), Fortaleza, CE, Brazil; Metropolitan University of Santos (UNIMES), Santos, Brazil; Department of Pharmacology, Institute of Biomedical Sciences, University of São Paulo (USP), São Paulo, Brazil
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Navarrete LC, Barrera NP, Huidobro-Toro JP. Vas deferens neuro-effector junction: from kymographic tracings to structural biology principles. Auton Neurosci 2014; 185:8-28. [PMID: 24956963 DOI: 10.1016/j.autneu.2014.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 05/14/2014] [Accepted: 05/20/2014] [Indexed: 11/29/2022]
Abstract
The vas deferens is a simple bioassay widely used to study the physiology of sympathetic neurotransmission and the pharmacodynamics of adrenergic drugs. The role of ATP as a sympathetic co-transmitter has gained increasing attention and furthered our understanding of its role in sympathetic reflexes. In addition, new information has emerged on the mechanisms underlying the storage and release of ATP. Both noradrenaline and ATP concur to elicit the tissue smooth muscle contractions following sympathetic reflexes or electrical field stimulation of the sympathetic nerve terminals. ATP and adenosine (its metabolic byproduct) are powerful presynaptic regulators of co-transmitter actions. In addition, neuropeptide Y, the third member of the sympathetic triad, is an endogenous modulator. The peptide plus ATP and/or adenosine play a significant role as sympathetic modulators of transmitter's release. This review focuses on the physiological principles that govern sympathetic co-transmitter activity, with special interest in defining the motor role of ATP. In addition, we intended to review the recent structural biology findings related to the topology of the P2X1R based on the crystallized P2X4 receptor from Danio rerio, or the crystallized adenosine A2A receptor as a member of the G protein coupled family of receptors as prototype neuro modulators. This review also covers structural elements of ectonucleotidases, since some members are found in the vas deferens neuro-effector junction. The allosteric principles that apply to purinoceptors are also reviewed highlighting concepts derived from receptor theory at the light of the current available structural elements. Finally, we discuss clinical applications of these concepts.
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Affiliation(s)
- L Camilo Navarrete
- Laboratorio de Estructura de Proteínas de Membrana y Señalización, Núcleo Milenio de Biología Estructural, NuBEs, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Chile
| | - Nelson P Barrera
- Laboratorio de Estructura de Proteínas de Membrana y Señalización, Núcleo Milenio de Biología Estructural, NuBEs, Facultad de Ciencias Biológicas, P. Universidad Católica de Chile, Chile
| | - J Pablo Huidobro-Toro
- Laboratorio de Nucleótidos, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Chile.
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Burnstock G. Purinergic signalling in the reproductive system in health and disease. Purinergic Signal 2014; 10:157-87. [PMID: 24271059 PMCID: PMC3944041 DOI: 10.1007/s11302-013-9399-7] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Accepted: 10/24/2013] [Indexed: 12/16/2022] Open
Abstract
There are multiple roles for purinergic signalling in both male and female reproductive organs. ATP, released as a cotransmitter with noradrenaline from sympathetic nerves, contracts smooth muscle via P2X1 receptors in vas deferens, seminal vesicles, prostate and uterus, as well as in blood vessels. Male infertility occurs in P2X1 receptor knockout mice. Both short- and long-term trophic purinergic signalling occurs in reproductive organs. Purinergic signalling is involved in hormone secretion, penile erection, sperm motility and capacitation, and mucous production. Changes in purinoceptor expression occur in pathophysiological conditions, including pre-eclampsia, cancer and pain.
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Affiliation(s)
- Geoffrey Burnstock
- Autonomic Neuroscience Centre, University College Medical School, Rowland Hill Street, London, NW3 2PF, UK,
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Abstract
Dopamine is an important regulator of systemic blood pressure via multiple mechanisms. It affects fluid and electrolyte balance by its actions on renal hemodynamics and epithelial ion and water transport and by regulation of hormones and humoral agents. The kidney synthesizes dopamine from circulating or filtered L-DOPA independently from innervation. The major determinants of the renal tubular synthesis/release of dopamine are probably sodium intake and intracellular sodium. Dopamine exerts its actions via two families of cell surface receptors, D1-like receptors comprising D1R and D5R, and D2-like receptors comprising D2R, D3R, and D4R, and by interactions with other G protein-coupled receptors. D1-like receptors are linked to vasodilation, while the effect of D2-like receptors on the vasculature is variable and probably dependent upon the state of nerve activity. Dopamine secreted into the tubular lumen acts mainly via D1-like receptors in an autocrine/paracrine manner to regulate ion transport in the proximal and distal nephron. These effects are mediated mainly by tubular mechanisms and augmented by hemodynamic mechanisms. The natriuretic effect of D1-like receptors is caused by inhibition of ion transport in the apical and basolateral membranes. D2-like receptors participate in the inhibition of ion transport during conditions of euvolemia and moderate volume expansion. Dopamine also controls ion transport and blood pressure by regulating the production of reactive oxygen species and the inflammatory response. Essential hypertension is associated with abnormalities in dopamine production, receptor number, and/or posttranslational modification.
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Affiliation(s)
- Ines Armando
- Children’s National Medical Center—Center for Molecular Physiology Research, Washington, District of Columbia
| | - Van Anthony M. Villar
- Children’s National Medical Center—Center for Molecular Physiology Research, Washington, District of Columbia
| | - Pedro A. Jose
- Children’s National Medical Center—Center for Molecular Physiology Research, Washington, District of Columbia
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Vas deferens – A model used to establish sympathetic cotransmission. Trends Pharmacol Sci 2010; 31:131-9. [DOI: 10.1016/j.tips.2009.12.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Revised: 11/27/2009] [Accepted: 12/07/2009] [Indexed: 11/18/2022]
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Morishita H, Shibata K, Sakata N, Kita S, Katsuragi T. A new approach to finding specific dopamine D4 receptor agonists. Eur J Pharmacol 2005; 516:145-50. [PMID: 15922324 DOI: 10.1016/j.ejphar.2005.04.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2005] [Accepted: 04/14/2005] [Indexed: 10/25/2022]
Abstract
This paper describes a new approach to finding specific dopamine D4 receptor agonists based on pharmacological analysis of the contractile response to ATP in guinea pig vas deferens. A partial cDNA of the dopamine D4 receptor of the vas deferens was identified. In the vas deferens, reverse transcription-polymerase chain reaction (RT-PCR) and Western blot analysis revealed the existence of dopamine D4 receptor mRNA and D4 receptor protein, respectively. ATP (10(-7) M) induced a transient phasic contraction in the presence of prazosin (10(-7) M), an alpha1-adrenoceptor antagonist. This contraction was potentiated by dopamine receptor agonists in a concentration-dependent manner; and was antagonized by 8-Methyl-6-(4-methyl-1-piperazinyl)-11H-pyrido[2,3-b][1,4]benzodiazepine (JL-18), a dopamine D4 receptor antagonist, but not by raclopride, a dopamine D2 and D3 receptor antagonist. Assay methods utilizing contractile responses to ATP may be available for identifying novel dopamine D4 receptor agonists.
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MESH Headings
- Adenosine Triphosphate/pharmacology
- Adrenergic alpha-Antagonists/pharmacology
- Amino Acid Sequence
- Animals
- Apomorphine/analogs & derivatives
- Apomorphine/pharmacology
- Blotting, Western
- Bromocriptine/pharmacology
- Cloning, Molecular
- Clozapine/analogs & derivatives
- Clozapine/pharmacology
- Dopamine/pharmacology
- Dopamine Agonists/pharmacology
- Dopamine Antagonists/pharmacology
- Dose-Response Relationship, Drug
- Drug Synergism
- Guinea Pigs
- In Vitro Techniques
- Male
- Molecular Sequence Data
- Muscle Contraction/drug effects
- Phenethylamines/pharmacology
- Prazosin/pharmacology
- Quinpirole/pharmacology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Receptors, Dopamine D2/agonists
- Receptors, Dopamine D2/genetics
- Receptors, Dopamine D2/metabolism
- Receptors, Dopamine D4
- Reverse Transcriptase Polymerase Chain Reaction
- Sequence Alignment
- Sequence Homology, Amino Acid
- Vas Deferens/drug effects
- Vas Deferens/metabolism
- Vas Deferens/physiology
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Affiliation(s)
- Hideji Morishita
- Department of Pharmacology, School of Medicine, Fukuoka University, Fukuoka 814-0180, Japan.
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Liégeois JF, Eyrolles L, Ellenbroek BA, Lejeune C, Carato P, Bruhwyler J, Géczy J, Damas J, Delarge J. New pyridobenzodiazepine derivatives: modifications of the basic side chain differentially modulate binding to dopamine (D(4.2), D(2L)) and serotonin (5-HT(2A)) receptors. J Med Chem 2002; 45:5136-49. [PMID: 12408724 DOI: 10.1021/jm0104825] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of new pyridobenzodiazepines with variation of the basic side chain were synthesized and evaluated for their binding to D(4.2), D(2L), and 5-HT(2A) receptors in comparison with clozapine, haloperidol, and two parent compounds previously described, 8-chloro-6-(4-methyl-1-piperazinyl)-11H-pyrido[2,3-b][1,4]benzodiazepine (8) and 8-methyl-6-(4-methyl-1-piperazinyl)-11H-pyrido[2,3-b][1,4]benzodiazepine (9). In the piperazine series, replacing the N-methyl group by a N-phenyl moiety (15-17, 30-32) provided a dramatic decrease of affinity for all receptors (K(i) > 1000 nM). A N-cyclohexyl group (20, 35) restored some affinity. Compounds with a N-benzyl (18, 33) or N-phenethyl side chain (19, 34) had significant affinities at D(4.2) and 5-HT(2A) receptors. Homologation of the piperazine nucleus (29, 44) led to a significant decrease of the affinity at all receptors investigated. In the 4-aminopiperidine series, N-methyl derivatives (21, 36) possessed less affinity in comparison with the N-methylpiperazine analogues (8, 9) while the N-benzyl congeners (22, 37) showed similar affinities. The rigidification of piperidine nucleus as obtained in azabicyclo[3.2.1]octane derivatives (23, 38) involved a slight reduction of the affinity at D(4.2) and 5-HT(2A) receptors while the affinity at D(2L) receptors was dramatically increased. The introduction of N-substituted aminoalkylamines to replace N-methylpiperazine generally led to a significant decrease in the affinity for D(4.2) receptors but some of these molecules (24, 25, 41) presented a significant 5-HT(2A) binding affinity. The presence of a more flexible side chain induced an increased conformational freedom. Consequently, the preferential position of the distal nitrogen or its basicity in piperazine derivatives was greatly modified. 19 with a high D(4.2) and 5-HT(2A) affinity (K(i) = 40 and 103 nM, respectively) did not induce cataleptic phenomenon in the paw test in rats but significantly reduced the immobility time in Porsolt's test in mice suggesting antidepressant properties.
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MESH Headings
- Amines/chemical synthesis
- Amines/chemistry
- Amines/pharmacology
- Animals
- Antidepressive Agents/chemical synthesis
- Antidepressive Agents/chemistry
- Antidepressive Agents/pharmacology
- Benzodiazepines/chemical synthesis
- Benzodiazepines/chemistry
- Benzodiazepines/pharmacology
- Catalepsy/chemically induced
- Cell Line
- Dopamine Agents/chemical synthesis
- Dopamine Agents/chemistry
- Dopamine Agents/pharmacology
- Female
- Humans
- Mice
- Molecular Conformation
- Piperazines/chemical synthesis
- Piperazines/chemistry
- Piperazines/pharmacology
- Piperidines/chemical synthesis
- Piperidines/chemistry
- Piperidines/pharmacology
- Radioligand Assay
- Rats
- Rats, Wistar
- Receptor, Serotonin, 5-HT2A
- Receptors, Adrenergic, alpha-1/drug effects
- Receptors, Adrenergic, alpha-1/metabolism
- Receptors, Dopamine D2/drug effects
- Receptors, Dopamine D2/metabolism
- Receptors, Dopamine D4
- Receptors, Serotonin/drug effects
- Receptors, Serotonin/metabolism
- Serotonin Agents/chemical synthesis
- Serotonin Agents/chemistry
- Serotonin Agents/pharmacology
- Structure-Activity Relationship
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Affiliation(s)
- Jean-François Liégeois
- Natural and Synthetic Drugs Research Center, Laboratory of Medicinal Chemistry, University of Liège, avenue de l'Hôpital 1 (B36), Belgium.
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Hyun JS, Baig MR, Yang DY, Leungwattanakij S, Kim KD, Abdel-Mageed AB, Bivalacqua TJ, Hellstrom WJG. Localization of peripheral dopamine D1 and D2 receptors in rat and human seminal vesicles. JOURNAL OF ANDROLOGY 2002; 23:114-20. [PMID: 11783439 DOI: 10.1002/j.1939-4640.2002.tb02604.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Dopamine, an established neurotransmitter in the central nervous system, is recognized for its role in penile erection and ejaculation in rats. However, its complete mechanism of action in the genitourinary tract is unknown. The objective of this study was to investigate the existence and expression of peripheral dopamine D1 and D2 receptor messenger RNAs (mRNAs) and corresponding proteins in rat and human seminal vesicles. The seminal vesicle tissues of male Sprague-Dawley rats and human radical prostatectomy specimens were used to extract total RNA and proteins, and to prepare slide sections. Rat hypothalamus tissue served as a control for dopamine D1 and D2 receptors. Testing for the presence and expression of peripheral dopamine D1 and D2 receptor mRNAs in rat and human seminal vesicle tissues was performed by reverse transcription-polymerase chain reaction. Western blotting was used to detect corresponding proteins of D1 and D2 receptors. Immunohistochemical staining using rabbit antipeptide polyclonal antibodies was employed to identify and anatomically localize dopamine D1 and D2 receptor proteins in rat and human seminal vesicles. Dopamine D1 and D2 receptor transcripts were detected in both human and rat seminal vesicle tissues. Western blot analysis demonstrated that peripheral dopamine D1 and D2 receptor proteins exist in both human and rat seminal vesicle tissues. Immunohistochemical analysis demonstrated the localization of peripheral dopamine D1 and D2 receptors to the smooth muscle layer of human and rat seminal vesicles. The results of this study demonstrate that peripheral dopamine D1 and D2 receptors are present in the seminal vesicle tissue in both rats and humans. Although these results suggest that seminal emission may be mediated in part by the stimulation of peripheral dopamine receptors located in the seminal vesicles, the functional significance of dopamine in male reproductive tract has yet to be fully defined.
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Affiliation(s)
- Jae-Seog Hyun
- Department of Urology, Tulane University Health Sciences Center, New Orleans, Louisiana 70112, USA
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