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Crankshaw DJ, Crosby DA, Morrison JJ. Effects of the KIR7.1 Blocker VU590 on Spontaneous and Agonist-Induced Contractions of Human Pregnant Myometrium. Reprod Sci 2017; 24:1402-1409. [PMID: 28071357 DOI: 10.1177/1933719116687657] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
KIR7.1, an inwardly rectifying K+ channel, plays a critical role in regulating uterine excitability during pregnancy and has been suggested as a potential new target for the treatment of conditions arising from dysfunctional uterine contractility, for example, atonic postpartum hemorrhage. The aim of this study was to investigate the effects of the selective KIR7.1 blocker, VU590, on both spontaneous and agonist-stimulated contractions of human pregnant myometrium in vitro. At a concentration of 20 µmol/L, VU590 significantly increased the mean contractile force and the frequency of spontaneous contractions ( P < 0.05) when compared to vehicle-treated tissues. However, there was a significant ( P < 0.0001) monoexponential decay in amplitude with time of exposure. When VU590 was coadministered with EC50 concentration of the uterotonics oxytocin, ergometrine, or carboprost, the only significant changes were an immediate decrease in the amplitude of oxytocin- and carboprost-induced contractions and a delayed reduction in amplitude and an increase in the frequency of ergometrine-induced contractions. Amplitude to all 3 agents in the presence of VU590 showed a monoexponential decay with time of exposure ( P < 0.0001). We conclude that VU590 modifies the contractility of pregnant human myometrium in support of a role for KIR7.1 in regulating that process. However, VU590 in vitro does not produce the types of contraction, either alone or in combination with other uterine stimulants that would suggest its usefulness as a first- or second-line clinical uterotonic agent.
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Affiliation(s)
- Denis J Crankshaw
- 1 Department of Obstetrics and Gynaecology, Lambe Institute for Translational Research, National University of Ireland Galway, Galway, Ireland
| | - David A Crosby
- 1 Department of Obstetrics and Gynaecology, Lambe Institute for Translational Research, National University of Ireland Galway, Galway, Ireland
| | - John J Morrison
- 1 Department of Obstetrics and Gynaecology, Lambe Institute for Translational Research, National University of Ireland Galway, Galway, Ireland
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2
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Fernández-Martínez E, Ponce-Monter H, Soria-Jasso LE, Ortiz MI, Arias-Montaño JA, Barragán-Ramírez G, Mayén-García C. Inhibition of Uterine Contractility by Thalidomide Analogs via Phosphodiesterase-4 Inhibition and Calcium Entry Blockade. Molecules 2016; 21:molecules21101332. [PMID: 27739411 PMCID: PMC6273742 DOI: 10.3390/molecules21101332] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 09/21/2016] [Accepted: 09/30/2016] [Indexed: 12/02/2022] Open
Abstract
Uterine relaxation is crucial during preterm labor. Phosphodiesterase-4 (PDE-4) inhibitors have been proposed as tocolytics. Some thalidomide analogs are PDE-4 inhibitors. The aim of this study was to assess the uterus-relaxant properties of two thalidomide analogs, methyl 3-(4-nitrophthalimido)-3-(3,4-dimethoxyphenyl)-propanoate (4NO2PDPMe) and methyl 3-(4-aminophthalimido)-3-(3,4-dimethoxyphenyl)-propanoate (4APDPMe) and were compared to rolipram in functional studies of spontaneous phasic, K+-induced tonic, and Ca2+-induced contractions in isolated pregnant human myometrial tissues. The accumulation of cAMP was quantified in HeLa cells. The presence of PDE-4B2 and phosphorylated myosin light-chain (pMLC), in addition to the effect of thalidomide analogs on oxytocin-induced pMLC, were assessed in human uterine myometrial cells (UtSMCs). Thalidomide analogs had concentration-dependent inhibitory effects on spontaneous and tonic contractions and inhibited Ca2+-induced responses. Tonic contraction was equipotently inhibited by 4APDPMe and rolipram (IC50 = 125 ± 13.72 and 98.45 ± 8.86 µM, respectively). Rolipram and the thalidomide analogs inhibited spontaneous and tonic contractions equieffectively. Both analogs increased cAMP accumulation in a concentration-dependent manner (p < 0.05) and induced changes in the subcellular localization of oxytocin-induced pMLC in UtSMCs. The inhibitory effects of thalidomide analogs on the contractions of pregnant human myometrium tissue may be due to their PDE-4 inhibitory effect and novel mechanism as calcium-channel blockers.
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Affiliation(s)
- Eduardo Fernández-Martínez
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - Héctor Ponce-Monter
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - Luis E Soria-Jasso
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - Mario I Ortiz
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
| | - José-Antonio Arias-Montaño
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Apdo. Postal 14-740, México City 07360, México.
| | | | - Cynthia Mayén-García
- Centro de Investigación en Biología de la Reproducción, Área Académica de Medicina del Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Pachuca 42090, Hidalgo, México.
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3
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Carvajal JA, Zambrano MJ, Theodor NM, Moreno LE, Olguín TR, Vanhauwaert PS, Rojas NB, Delpiano AM. The Synergic In Vitro Tocolytic Effect of Nifedipine Plus Ritodrine on Human Myometrial Contractility. Reprod Sci 2016; 24:635-640. [PMID: 27609401 DOI: 10.1177/1933719116667221] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Many pharmacological agents have been investigated to manage preterm labor; we postulate that a combination of tocolytic drugs may achieve a better effect in the prevention of uterine contractions without dose-dependent adverse effects. The aim of this study was to evaluate the inhibitory effect of dual combinations of tocolytics in vitro. Human myometrium was obtained during elective cesarean sections (term without labor; n = 40). Myometrial strips were placed in organ baths for the measurement of isometric tension. Contractile activity was induced by oxytocin (10-8 mol/L), then a concentration-response curve to single or dual combinations of tocolytics was started. All studied tocolytics (nifedipine, ritodrine, nitroglycerin, atosiban, and NS-1619), when used alone, significantly inhibited myometrial contractions. When combined, nifedipine plus ritodrine produced a significantly greater inhibition of contractility than each drug alone in the midrange of concentrations. The combination of nifedipine plus nitroglycerin or nifedipine plus atosiban produced a significantly greater inhibition than nitroglycerin or atosiban alone but not greater than nifedipine. The combination of nifedipine plus NS-1619 (Ca+2-activated K+ [BKCa] channel opener) reduced the inhibitory effect of each drug. We concluded that a selected combination of tocolytics (nifedipine plus ritodrine) produced a significantly greater inhibitory effect on contractility than each drug alone at intermediate concentrations. Thus, specific combinations of tocolytics with different intracellular signaling pathways may have a synergic effect constituting a provocative new option for preterm labor treatment.
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Affiliation(s)
- Jorge Andrés Carvajal
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - María José Zambrano
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nur Mónica Theodor
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Luis Emilio Moreno
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Thiare Rosario Olguín
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Paula Sofía Vanhauwaert
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nevenka Belén Rojas
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Ana María Delpiano
- 1 Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
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Abstract
Preterm births are an expensive global health problem. Despite the basic science and clinical research advances to better understand and prevent preterm births, the rates are increasing. There are several therapeutic options. While some options such as progestins work for selected women, others such as magnesium sulfate can only be used for delaying births for 24 to 48 hours so that the patients can be treated with corticosteroids to promote fetal lung maturity. Based on the scientific and clinical evidence, we recommend testing human chorionic gonadotropin in a large multicenter, randomized, double-blind, and placebo-controlled clinical trials in women with active preterm labor and those with a previous history of preterm births. Human chorionic gonadotropin is not only inexpensive but also has not shown any side effects so far in the infants or in the mothers.
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Affiliation(s)
- C V Rao
- Departments of Cellular Biology and Pharmacology, Molecular and Human Genetics and Obstetrics and Gynecology, Reproduction and Development Program, Herbert Wertheim College of Medicine, Florida International University, Miami, FL, USA
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Abstract
There is controversy as to whether maternal age exerts an influence on the contractility of human myometrium in pregnancy. The aim of this study was to examine a series of functional contractile parameters of human myometrium in vitro, over a broad range of maternal ages. Myometrial tissue specimens were obtained at cesarean delivery from 32 women with maternal ages ranging from 28 to 52 years. Using in vitro recordings, a number of contractile parameters including maximal amplitude, mean contractile force, time to maximal amplitude, maximum rate of rise, and occurrence of simple and complex (biphasic and multiphasic) contractions were examined for spontaneous and induced contractile activity. The relationship between maternal age and individual parameters was evaluated using linear regression analysis. For all contractile parameters examined, for both spontaneous and induced contractions, no significant correlation was observed with maternal age between 28 and 52 years. The mean maximum amplitude values for spontaneous and oxytocin-induced contractions were 23 ± 3 and 43 ± 5 mN, respectively. The mean contractile forces for spontaneous and oxytocin-induced contractions were 1.5 ± 0.2 and 6.5 ± 0.9 mN, respectively. There was no variation in the proportion of biphasic or multiphasic contractions with maternal age. These results indicate there is no significant functional impairment of uterine contractility and no lack in responsiveness of myometrium in vitro, in the older mother. These findings do not support the concept that there may be a biological basis for dysfunctional labor or increased cesarean delivery rates in older parturients.
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Affiliation(s)
- Denis J Crankshaw
- Department of Obstetrics and Gynaecology, National University of Ireland Galway, Galway, Ireland
| | - Yvonne M O'Brien
- Department of Obstetrics and Gynaecology, National University of Ireland Galway, Galway, Ireland
| | - David A Crosby
- Department of Obstetrics and Gynaecology, National University of Ireland Galway, Galway, Ireland
| | - John J Morrison
- Department of Obstetrics and Gynaecology, National University of Ireland Galway, Galway, Ireland
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6
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Mas A, Cervelló I, Fernández-Álvarez A, Faus A, Díaz A, Burgués O, Casado M, Simón C. Overexpression of the truncated form of High Mobility Group A proteins (HMGA2) in human myometrial cells induces leiomyoma-like tissue formation. Mol Hum Reprod 2014; 21:330-8. [PMID: 25542836 DOI: 10.1093/molehr/gau114] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Accepted: 12/17/2014] [Indexed: 12/24/2022] Open
Abstract
The pathogenesis of uterine leiomyomas, the most common benign tumor in women, is still unknown. This lack of basic knowledge limits the development of novel non-invasive therapies. Our group has previously demonstrated that leiomyoma side population (SP) cells are present in tumor lesions and act like putative tumor-initiating stem cells in human leiomyoma. Moreover, accumulated evidence demonstrates that these benign tumors of mesenchymal origin are characterized by rearrangements of the High Mobility Group A proteins (HMGA). In this work, we tested the hypothesis that leiomyoma development may be due to overexpression of HMGA2 (encoding high mobility group AT-hook2) in myometrial stem cells using in vitro and in vivo approaches. Our work demonstrates that the truncated/short form of HMGA2 induces myometrial cell transformation toward putative tumor-initiating leiomyoma cells and opens up new possibilities to understand the origin of leiomyomas and the development of new therapeutic approaches.
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Affiliation(s)
- Aymara Mas
- Fundación IVI, Instituto Universitario IVI, Department of Obstetrics & Gynecology, School of Medicine, University of Valencia, INCLIVA, Valencia, Spain
| | - Irene Cervelló
- Fundación IVI, Instituto Universitario IVI, Department of Obstetrics & Gynecology, School of Medicine, University of Valencia, INCLIVA, Valencia, Spain
| | | | - Amparo Faus
- Fundación IVI, Instituto Universitario IVI, Department of Obstetrics & Gynecology, School of Medicine, University of Valencia, INCLIVA, Valencia, Spain
| | - Ana Díaz
- Central Service for Experimental Research, University of Valencia, INCLIVA, Valencia, Spain
| | - Octavio Burgués
- Department of Pathology, Hospital Clínico Universitario of Valencia, Valencia, Spain
| | - Marta Casado
- Biomedical Institute of Valencia (IBV-CSIC), Valencia, Spain
| | - Carlos Simón
- Fundación IVI, Instituto Universitario IVI, Department of Obstetrics & Gynecology, School of Medicine, University of Valencia, INCLIVA, Valencia, Spain Department of Obstetrics and Gynecology, School of Medicine, Stanford University, Stanford, CA, USA
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7
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Crankshaw DJ, Pistilli MJ, O'Brien YM, Sweeney EM, Dockery P, Holloway AC, Morrison JJ. The effects of extracellular calcium-sensing receptor ligands on the contractility of pregnant human myometrium in vitro. Reprod Sci 2013; 20:882-90. [PMID: 23287098 DOI: 10.1177/1933719112468949] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Ligands for extracellular calcium-sensing (CaS) receptors inhibit oxytocin-induced contractions of the rat's uterus. In this study, we investigated whether the CaS receptor ligands calindol, cinacalcet, and calhex 231 have similar effects on pregnant human myometrium. We compared their effects to those of the calcium-channel blocker nifedipine. In conventional concentration-effect experiments, both the mean contractile force (MCF) and the maximum amplitude of contractions induced by 1 nmol/L oxytocin were inhibited by nifedipine. Calindol and cinacalcet were ineffective as inhibitors, while calhex-231 produced partial inhibition. When single 10 μmol/L doses were applied calhex-231 produced a slowly developing inhibition, reducing the MCF to 38%, and amplitude to 34%, of vehicle controls after 1 hour. In similar experiments, calindol was ineffective while cinacalcet weakly inhibited only the amplitude. Immunohistochemistry revealed sparse expression of CaS receptors in pregnant human myometrium.
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Affiliation(s)
- Denis J Crankshaw
- Department of Obstetrics and Gynaecology, National University of Ireland-Galway, Ireland.
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8
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Cretoiu D, Ciontea SM, Popescu LM, Ceafalan L, Ardeleanu C. Interstitial Cajal-like cells (ICLC) as steroid hormone sensors in human myometrium: immunocytochemical approach. J Cell Mol Med 2006; 10:789-95. [PMID: 16989738 PMCID: PMC3933160 DOI: 10.1111/j.1582-4934.2006.tb00438.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Accepted: 09/06/2006] [Indexed: 11/29/2022] Open
Abstract
Expression of estrogen (ER) and progesterone (PR) receptors was investigated in cultured human normal myometrial cells (non-pregnant uterus, fertile period). The ER and PR expression was studied by immunohistochemistry and immunofluorescence on either myocytes or interstitial Cajal-like cells (ICLC). Only those cells double immunostained for c-kit and steroid receptors were considered as ICLC. ER and/or PR immunoreactivity was localized in ICLC, primarily concentrated at the nucleus level, but it was also observed in the cell body (cytoplasm) and processes. Stronger immunopositive reaction in the ICLC nucleus for PR than for ER was noted. Under our experimental conditions, a clear positive repeatable reaction for steroid receptors could not be detected in myocytes. In conclusion, these data suggest that ICLC could be true hormonal 'sensors', possibly participating in the regulation of human myometrial contractions (via gap junctions with myocytes and/or by paracrine signaling).
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Affiliation(s)
- D Cretoiu
- ‘Victor Babes’ National Institute of PathologyBucharest, Romania
- Department of Cellular and Molecular Medicine, ‘Carol Davila’ University of Medicine and PharmacyBucharest, Romania
| | - Sanda M Ciontea
- ‘Victor Babes’ National Institute of PathologyBucharest, Romania
- Department of Cellular and Molecular Medicine, ‘Carol Davila’ University of Medicine and PharmacyBucharest, Romania
| | - LM Popescu
- ‘Victor Babes’ National Institute of PathologyBucharest, Romania
- Department of Cellular and Molecular Medicine, ‘Carol Davila’ University of Medicine and PharmacyBucharest, Romania
| | - Laura Ceafalan
- Department of Cellular and Molecular Medicine, ‘Carol Davila’ University of Medicine and PharmacyBucharest, Romania
| | - Carmen Ardeleanu
- ‘Victor Babes’ National Institute of PathologyBucharest, Romania
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Patak E, Luz Candenas M, Pennefather JN, Ziccone S, Lilley A, Martín JD, Flores C, Mantecón AG, Story ME, Pinto FM. Tachykinins and tachykinin receptors in human uterus. Br J Pharmacol 2003; 139:523-32. [PMID: 12788812 PMCID: PMC1573878 DOI: 10.1038/sj.bjp.0705279] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
(1) Studies were undertaken to determine the nature of the receptors mediating contractile effects of tachykinins in the uteri of nonpregnant women, and to analyse the expression of preprotachykinins (PPT), tachykinin receptors and the cell-surface peptidase, neprilysin (NEP), in the myometrium from pregnant and nonpregnant women. (2) The neurokinin B (NKB) precursor PPT-B was expressed in higher levels in the myometrium from nonpregnant than from pregnant women. Faint expression of PPT-A mRNA was detectable in the myometrium from nonpregnant but not pregnant women. PPT-C, the gene encoding the novel tachykinin peptide hemokinin-1 (HK-1), was present in trace amounts in the uteri from both pregnant and nonpregnant women. (3) Tachykinin NK(2) receptors were more strongly expressed in tissues from nonpregnant than from pregnant women. NK(1) receptor mRNA was present in low levels in tissues from both pregnant and nonpregnant women. A low abundance transcript corresponding to the NK(3) receptor was present only in tissues from nonpregnant women. (4) The mRNA expression of the tachykinin-degrading enzyme NEP was lower in tissues from nonpregnant than from pregnant women. (5) Substance P (SP), neurokinin A (NKA) and NKB, in the presence of the peptidase inhibitors thiorphan, captopril and bestatin, produced contractions of myometrium from nonpregnant women. The order of potency was NKA>>SP>/=NKB. The potency of NKA was unchanged in the absence of peptidase inhibitors. (6) The tachykinin NK(2) receptor-selective agonist [Lys(5)MeLeu(9)Nle(10)]NKA(4-l0) was approximately equipotent with NKA, but the tachykinin NK(1) and NK(3) receptor-selective agonists [Sar(9)Met(O(2))(11)]SP and [MePhe(7)]NKB were ineffective in the myometrium from nonpregnant women. (7) The uterotonic effects of [Lys(5)MeLeu(9)Nle(10)]NKA(4-10) were antagonized by the tachykinin NK(2) receptor-selective antagonist SR48968. Neither atropine, nor phentolamine nor tetrodotoxin affected responses to [Lys(5)MeLeu(9)Nle(10)]NKA(4-10). (8) These data are consistent with a role of tachykinins in the regulation of human uterine function, and reinforce the importance of NK(2) receptors in the regulation of myometrial contraction.
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Affiliation(s)
- Eva Patak
- Department of Anaesthetics, Royal Women's Hospital, Carlton, Victoria 3053, Australia
| | - M Luz Candenas
- Centro de Investigaciones Científicas Isla de La Cartuja, Instituto de Investigaciones Químicas, Avda. Americo Vespucio s/n, 41092 Sevilla, Spain
| | - Jocelyn N Pennefather
- Department of Anaesthetics and University of Melbourne Department of Obstetrics and Gynaecology, Royal Women's Hospital, Carlton, Victoria 3053, Australia
- Author for correspondence:
| | - Sebastian Ziccone
- Department of Anaesthetics, Royal Women's Hospital, Carlton, Victoria 3053, Australia
| | - Alison Lilley
- Department of Anaesthetics, Royal Women's Hospital, Carlton, Victoria 3053, Australia
| | - Julio D Martín
- Centro de Investigaciones Científicas Isla de La Cartuja, Instituto de Investigaciones Químicas, Avda. Americo Vespucio s/n, 41092 Sevilla, Spain
| | - Carlos Flores
- Unidad de Investigación, Hospital Universitario Nuestra Señora de Candelaria, Tenerife, Spain
| | - Antonio G Mantecón
- Centro de Investigaciones Científicas Isla de La Cartuja, Instituto de Investigaciones Químicas, Avda. Americo Vespucio s/n, 41092 Sevilla, Spain
| | - Margot E Story
- Department of Pharmacology, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Francisco M Pinto
- Centro de Investigaciones Científicas Isla de La Cartuja, Instituto de Investigaciones Químicas, Avda. Americo Vespucio s/n, 41092 Sevilla, Spain
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Bardou M, Loustalot C, Cortijo J, Simon B, Naline E, Dumas M, Esteve S, Croci T, Chalon P, Frydman R, Sagot P, Manara L, Morcillo EJ, Advenier C. Functional, biochemical and molecular biological evidence for a possible beta(3)-adrenoceptor in human near-term myometrium. Br J Pharmacol 2000; 130:1960-6. [PMID: 10952688 PMCID: PMC1572258 DOI: 10.1038/sj.bjp.0703491] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The possible existence of a beta(3)-adrenoceptor (beta(3)-AR) in human near-term myometrium was investigated by in vitro functional and biochemical studies and analysis of mRNA expression. SR 59119A and SR 59104A and CGP 12177 (two selective agonists and a partial agonist, respectively, of the beta(3)-AR), salbutamol and terbutaline (beta(2)-AR agonists) each produced a concentration-dependent relaxation of the myometrial spontaneous contractions. There were no differences in pD(2) values for the relaxing potencies of terbutaline, salbutamol, CGP 12177 and SR 59119A. The rank order for their relaxing efficacies was SR 59119A>SR 59104A>terbutaline approximately salbutamol approximately CGP 12177 (E(max)=52+/-7%, 42+/-12% and approximately 30% respectively). Propranolol, a beta(1)- and beta(2)-AR antagonist, and ICI 118551, a beta(2)-AR antagonist (both at 0.1 microM), did not affect the SR 59119A-induced relaxation whereas SR 59230A, a selective beta(3)-AR antagonist (1 microM), significantly reduced the maximal relaxing effect of SR 59119A. SR 59119A and salbutamol induced a significant increase in cyclic AMP levels that was antagonized by SR 59230A but not by propranolol for SR 59119A, and by propranolol but not by SR 59230A for salbutamol. The beta(3)-AR mRNA was positively expressed in myometrium preparations in a reverse transcription polymerase chain assay. The results presented provide the first evidence for the existence of the beta(3)-AR subtype in human near-term myometrium and suggest that the effects of SR 59119A might be mediated through an increase in cyclic AMP level.
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Affiliation(s)
- M Bardou
- Department of Pharmacology, Faculty of Medicine Paris-Ouest, 15 rue de l'Ecole de Médecine 75006 Paris, France.
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