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Lim J, Sabandal PR, Fernandez A, Sabandal JM, Lee HG, Evans P, Han KA. The octopamine receptor Octβ2R regulates ovulation in Drosophila melanogaster. PLoS One 2014; 9:e104441. [PMID: 25099506 PMCID: PMC4123956 DOI: 10.1371/journal.pone.0104441] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 07/14/2014] [Indexed: 12/13/2022] Open
Abstract
Oviposition is induced upon mating in most insects. Ovulation is a primary step in oviposition, representing an important target to control insect pests and vectors, but limited information is available on the underlying mechanism. Here we report that the beta adrenergic-like octopamine receptor Octβ2R serves as a key signaling molecule for ovulation and recruits protein kinase A and Ca2+/calmodulin-sensitive kinase II as downstream effectors for this activity. We found that the octβ2r homozygous mutant females are sterile. They displayed normal courtship, copulation, sperm storage and post-mating rejection behavior but were unable to lay eggs. We have previously shown that octopamine neurons in the abdominal ganglion innervate the oviduct epithelium. Consistently, restored expression of Octβ2R in oviduct epithelial cells was sufficient to reinstate ovulation and full fecundity in the octβ2r mutant females, demonstrating that the oviduct epithelium is a major site of Octβ2R’s function in oviposition. We also found that overexpression of the protein kinase A catalytic subunit or Ca2+/calmodulin-sensitive protein kinase II led to partial rescue of octβ2r’s sterility. This suggests that Octβ2R activates cAMP as well as additional effectors including Ca2+/calmodulin-sensitive protein kinase II for oviposition. All three known beta adrenergic-like octopamine receptors stimulate cAMP production in vitro. Octβ1R, when ectopically expressed in the octβ2r’s oviduct epithelium, fully reinstated ovulation and fecundity. Ectopically expressed Octβ3R, on the other hand, partly restored ovulation and fecundity while OAMB-K3 and OAMB-AS that increase Ca2+ levels yielded partial rescue of ovulation but not fecundity deficit. These observations suggest that Octβ2R have distinct signaling capacities in vivo and activate multiple signaling pathways to induce egg laying. The findings reported here narrow the knowledge gap and offer insight into novel strategies for insect control.
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Affiliation(s)
- Junghwa Lim
- Department of Biological Sciences, Border Biomedical Research Center/Neuroscience and Metabolic Disorders, University of Texas at El Paso, El Paso, Texas, United States of America
| | - Paul R. Sabandal
- Department of Biological Sciences, Border Biomedical Research Center/Neuroscience and Metabolic Disorders, University of Texas at El Paso, El Paso, Texas, United States of America
| | - Ana Fernandez
- Department of Biological Sciences, Border Biomedical Research Center/Neuroscience and Metabolic Disorders, University of Texas at El Paso, El Paso, Texas, United States of America
| | - John Martin Sabandal
- Department of Biological Sciences, Border Biomedical Research Center/Neuroscience and Metabolic Disorders, University of Texas at El Paso, El Paso, Texas, United States of America
| | - Hyun-Gwan Lee
- Department of Biological Sciences, Border Biomedical Research Center/Neuroscience and Metabolic Disorders, University of Texas at El Paso, El Paso, Texas, United States of America
| | - Peter Evans
- The Inositide Laboratory, The Babraham Institute, Cambridge, United Kingdom
| | - Kyung-An Han
- Department of Biological Sciences, Border Biomedical Research Center/Neuroscience and Metabolic Disorders, University of Texas at El Paso, El Paso, Texas, United States of America
- * E-mail:
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Lee HG, Rohila S, Han KA. The octopamine receptor OAMB mediates ovulation via Ca2+/calmodulin-dependent protein kinase II in the Drosophila oviduct epithelium. PLoS One 2009; 4:e4716. [PMID: 19262750 PMCID: PMC2650798 DOI: 10.1371/journal.pone.0004716] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2008] [Accepted: 02/04/2009] [Indexed: 11/18/2022] Open
Abstract
Ovulation is an essential physiological process in sexual reproduction; however, the underlying cellular mechanisms are poorly understood. We have previously shown that OAMB, a Drosophila G-protein-coupled receptor for octopamine (the insect counterpart of mammalian norepinephrine), is required for ovulation induced upon mating. OAMB is expressed in the nervous and reproductive systems and has two isoforms (OAMB-AS and OAMB-K3) with distinct capacities to increase intracellular Ca2+ or intracellular Ca2+ and cAMP in vitro. Here, we investigated tissue specificity and intracellular signals required for OAMB's function in ovulation. Restricted OAMB expression in the adult oviduct epithelium, but not the nervous system, reinstated ovulation in oamb mutant females, in which either OAMB isoform was sufficient for the rescue. Consistently, strong immunoreactivities for both isoforms were observed in the wild-type oviduct epithelium. To delineate the cellular mechanism by which OAMB regulates ovulation, we explored protein kinases functionally interacting with OAMB by employing a new GAL4 driver with restricted expression in the oviduct epithelium. Conditional inhibition of Ca2+/Calmodulin-dependent protein kinase II (CaMKII), but not protein kinase A or C, in the oviduct epithelium inhibited ovulation. Moreover, constitutively active CaMKII, but not protein kinase A, expressed only in the adult oviduct epithelium fully rescued the oamb female's phenotype, demonstrating CaMKII as a major downstream molecule conveying the OAMB's ovulation signal. This is consistent with the ability of both OAMB isoforms, whose common intracellular signal in vitro is Ca2+, to reinstate ovulation in oamb females. These observations reveal the critical roles of the oviduct epithelium and its cellular components OAMB and CaMKII in ovulation. It is conceivable that the OAMB-mediated cellular activities stimulated upon mating are crucial for secretory activities suitable for egg transfer from the ovary to the uterus.
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Affiliation(s)
- Hyun-Gwan Lee
- The Huck Institute Genetics Graduate Program, Pennsylvania State University, University Park, Pennsylvania, United States of America
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Suman Rohila
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Kyung-An Han
- The Huck Institute Genetics Graduate Program, Pennsylvania State University, University Park, Pennsylvania, United States of America
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, United States of America
- * E-mail:
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Horne AW, Phillips JA, Kane N, Lourenco PC, McDonald SE, Williams ARW, Simon C, Dey SK, Critchley HOD. CB1 expression is attenuated in Fallopian tube and decidua of women with ectopic pregnancy. PLoS One 2008; 3:e3969. [PMID: 19093002 PMCID: PMC2601032 DOI: 10.1371/journal.pone.0003969] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Accepted: 11/07/2008] [Indexed: 01/04/2023] Open
Abstract
Background Embryo retention in the Fallopian tube (FT) is thought to lead to ectopic pregnancy (EP), a considerable cause of morbidity. In mice, genetic/pharmacological silencing of cannabinoid receptor Cnr1, encoding CB1, causes retention of embryos in the oviduct. The role of the endocannabinoids in tubal implantation in humans is not known. Methods and Findings Timed FT biopsies (n = 18) were collected from women undergoing gynecological procedures for benign conditions. Endometrial biopsies and whole blood were collected from women undergoing surgery for EP (n = 11); management of miscarriage (n = 6), and termination of pregnancy (n = 8). Using RT-PCR and immunohistochemistry, CB1 mRNA and protein expression levels/patterns were examined in FT and endometrial biopsies. The distribution of two polymorphisms of CNR1 was examined by TaqMan analysis of genomic DNA from the whole blood samples. In normal FT, CB1 mRNA was higher in luteal compared to follicular-phase (p<0.05). CB1 protein was located in smooth muscle of the wall and of endothelial vessels, and luminal epithelium of FT. In FT from women with EP, CB1 mRNA expression was low. CB1 mRNA expression was also significantly lower (p<0.05) in endometrium of women with EP compared to intrauterine pregnancies (IUP). Although of 1359G/A (rs1049353) polymorphisms of CNR1 gene suggests differential distribution of genotypes between the small, available cohorts of women with EP and those with IUP, results were not statistically significant. Conclusions CB1 mRNA shows temporal variation in expression in human FT, likely regulated by progesterone. CB1 mRNA is expressed in low levels in both the FT and endometrium of women with EP. We propose that aberrant endocannabinoid-signaling in human FT leads to EP. Furthermore, our finding of reduced mRNA expression along with a possible association between polymorphism genotypes of the CNR1 gene and EP, suggests a possible genetic predisposition to EP that warrants replication in a larger sample pool.
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Affiliation(s)
- Andrew W. Horne
- Department of Reproductive and Developmental Sciences, University of Edinburgh, Centre for Reproductive Biology, Queen's Medical Research Institute, Edinburgh, United Kingdom
| | - John A. Phillips
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Nicole Kane
- Department of Reproductive and Developmental Sciences, University of Edinburgh, Centre for Reproductive Biology, Queen's Medical Research Institute, Edinburgh, United Kingdom
| | - Paula C. Lourenco
- Department of Reproductive and Developmental Sciences, University of Edinburgh, Centre for Reproductive Biology, Queen's Medical Research Institute, Edinburgh, United Kingdom
| | - Sarah E. McDonald
- Department of Reproductive and Developmental Sciences, University of Edinburgh, Centre for Reproductive Biology, Queen's Medical Research Institute, Edinburgh, United Kingdom
| | - Alistair R. W. Williams
- Department of Pathology, University of Edinburgh, Royal Infirmary of Edinburgh, Edinburgh, United Kingdom
| | - Carlos Simon
- Fundación IVI (FIVI)-Instituto Universitario IVI (IUIVI)-Universidad de Valencia, Valencia, Spain
| | - Sudhansu K. Dey
- Division of Reproductive Sciences, Cincinnati Children's Research Foundation, Cincinnati, Ohio, United States of America
| | - Hilary O. D. Critchley
- Department of Reproductive and Developmental Sciences, University of Edinburgh, Centre for Reproductive Biology, Queen's Medical Research Institute, Edinburgh, United Kingdom
- * E-mail:
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Khan I, Omu AE, Fatinikun T, Chandrasekhar B, Kadavil EA, Oriowo MA. Evidence for the Presence of Beta-3-Adrenoceptors Mediating Relaxation in the Human Oviduct. Pharmacology 2005; 74:157-62. [PMID: 15785116 DOI: 10.1159/000084615] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2004] [Accepted: 11/05/2004] [Indexed: 11/19/2022]
Abstract
Beta1- and beta2-adrenoceptors mediate relaxation in the oviductal smooth muscle. This study examines the existence and function of beta3-adrenoceptors in the human oviduct. Ring segments of the oviduct were set up for isometric tension recording. The effect of isoprenaline and BRL 37344 on smooth muscle tone was examined. The expression of beta3-adrenoceptors in the oviduct was also examined. Isoprenaline and BRL 37344 concentration-dependently relaxed circular muscles of the oviduct. BRL 37344 was less potent than isoprenaline and was a partial agonist. Propranolol shifted isoprenaline but not BRL 37344 concentration-response curve to the right without reducing the maximum response. Cyanopindolol (1 micromol/l), a beta3-adrenoceptor antagonist, shifted the isoprenaline concentration response curve to the right. The -log K(B) value of 7.8 indicates activation of beta3-adrenoceptors by isoprenaline. mRNA for beta3-adrenoceptors was expressed in the oviduct. These results suggest that beta3-adrenoceptors, mediating relaxation, are expressed in the human oviduct.
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Affiliation(s)
- Islam Khan
- Department of Biochemistry, Faculty of Medicine, Kuwait University, Kuwait, Kuwait
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Einspanier R, Gabler C, Kettler A, Kloas W. Characterization and localization of beta2-adrenergic receptors in the bovine oviduct: indication for progesterone-mediated expression. Endocrinology 1999; 140:2679-84. [PMID: 10342858 DOI: 10.1210/endo.140.6.6701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Beta2-adrenergic receptors were detected in bovine oviductal epithelium by use of receptor binding studies and expression analysis. Complementary DNA cloning gave use to the first full-length bovine beta2-adrenoceptor messenger RNA sequence (2030 bases). Receptor bioactivity in oviduct epithelial cells was characterized by specific ligand interaction and consequent cAMP generation. Expression studies demonstrated an estrous cycle-dependent regulation, with higher transcript levels and significantly increased binding capacity during the luteal phase. After progesterone supplementation, oviduct epithelial cells showed elevated receptor expression in culture, supporting the hypothesis that progesterone up-regulates the beta2-adrenergic receptor within these cells. It seems likely that catecholamines from the circulation or from innervation might be able to influence reproductive success by regulating oviductal secretion.
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Affiliation(s)
- R Einspanier
- Institute of Physiology, Technical University Munich-Weihenstephan, Freising, Germany.
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Lindvall-Axelsson M, Owman C. Changes in transport functions of isolated rabbit choroid plexus under the influence of oestrogen and progesterone. ACTA PHYSIOLOGICA SCANDINAVICA 1989; 136:107-11. [PMID: 2549764 DOI: 10.1111/j.1748-1716.1989.tb08635.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Isolated choroid plexuses from rabbits were used to determine uptake and accumulation of 10(-5) M radiolabelled choline (expressed as tissue/medium ratio) and the activities of various types of ATPases (based on ouabain inhibition and bicarbonate stimulation) following pre-treatment of the animals with 0.5 mg kg-1 17-beta-oestradiol, alone or in combination with 2 mg kg-1 progesterone. The combined treatment reduced the choline uptake by 35% and also lowered the activity of Na+,K+-ATPase by 31%, without influencing tissue wet weight. The reduction in HCO3-ATPase was smaller and not statistically significant. There was a tendency also for oestrogen alone to lower these activities, but only by less than 20%. The Ca2+,Mg2+-ATPase activity was not significantly affected by any of the hormones.
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Abstract
Catecholamines are known to have an inhibitory effect on oviductal smooth musculature by changing the adrenergic receptors activity. In order to further investigate the role of epinephrine and/or norepinephrine in oviduct, the distribution of beta-adrenergic receptors has been studied in the rat oviduct, using in vitro autoradiography and [125I]cyanopindolol (CYP), as radioligand. The specificity of the labelling and the characterization of receptor subtypes in different cell types was achieved by displacement of radioligand with increasing concentrations of zinterol, a beta-adrenergic agonist with preferential affinity for the beta 2-adrenoreceptor subtype and practolol, a beta-adrenergic antagonist that binds preferentially to beta 1-subtype. Quantitative estimation of ligand binding was achieved by densitometry. It was shown that the vast majority of beta-receptors were of the beta 2-subtype and were found in smooth muscle layers as well as in the epithelium. The latter localization suggests a role for epinephrine and/or norepinephrine on the oviductal epithelium.
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Affiliation(s)
- M Tolszczuk
- MRC Group in Molecular Endocrinology, Laval University Medical Centre, Sainte-Foy, Que, Canada
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Lydrup ML, Hellstrand P. Rate of oxidative and glycolytic metabolism in the guinea-pig oviduct in relation to contractility and hormonal cycle. ACTA PHYSIOLOGICA SCANDINAVICA 1986; 128:525-33. [PMID: 3811980 DOI: 10.1111/j.1748-1716.1986.tb08008.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The rates of oxygen consumption and lactate production in the guinea-pig oviduct were measured together with registration of contractile activity during three phases of the hormonal cycle. In pro-oestrus (high oestrogen, low progesterone levels) and oestrus (time of ovulation, high oestrogen and progesterone) the rate of O2 consumption was higher than in dioestrus (low oestrogen, high progesterone). The frequency of spontaneous contractions was higher in oestrus than in the other phases. No significant differences in the proportion of the cross-sectional area occupied by smooth muscle were found between oviducts in di- and pro-oestrus. Stimulation by phenylephrine caused decreased frequency and increased amplitude of contractions in dioestrus but not in pro-oestrus, suggesting hormonal modulation of adrenergic mechanisms. The rate of relaxation of high-K+ contractures was higher in pro- than dioestrus. Lactate production and contents of ATP, ADP and phosphocreatine showed no significant variation with hormonal state. The increased rate of oxidative metabolism under oestrogenic dominance could in part reflect changes in ionic transport mechanisms, such as intracellular Ca2+ handling.
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Samuelson UE, Sjöstrand NO. Myogenic and neurogenic control of electrical and mechanical activity in human oviductal smooth muscle. ACTA PHYSIOLOGICA SCANDINAVICA 1986; 126:355-63. [PMID: 3962684 DOI: 10.1111/j.1748-1716.1986.tb07827.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Isolated strips from isthmic and ampullary muscle layers of the human fallopian tube were investigated with the sucrose-gap technique and in organ baths. Generally good correlation existed between electrical and mechanical activity, but dissociation was also noted. The isthmic external longitudinal layer (IEL) was characterized by slow waves of depolarization and broad 'spikes'. Tonic contraction followed depolarization, and phasic waves followed the spikes. In the other layers, regular spikes and phasic contractions dominated. Late in the menstrual cycle, more irregular patterns and slow waves, which could synchronize spike activity, were found. Automaticity tended to be highest in the late proliferative phase. Active response to stretch was best demonstrated in IEL. Excitatory alpha-adrenergic responses (hypopolarization, firing and contraction) to noradrenaline and nerve stimulation dominated in the IEL. In the other layers, beta-adrenergic inhibition prevailed. Non-adrenergic, non-cholinergic neurogenic inhibition was demonstrated. Decrease in spike frequency and hyperpolarization seemed to be as prominent as during beta-adrenergic inhibition. Muscarinic stimulation by acetylcholine was recorded as depolarization, spikes and contraction. However, a role for cholinergic nerves could not be defined. Thus, the human oviductal smooth muscle belongs to the single unit category; its activity can be modified during the menstrual cycle, by stretch and by excitatory and inhibitory nerves.
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