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Schonfeld L, Jaehne EJ, Ogden AR, Spiers JG, Hogarth S, van den Buuse M. Differential effects of chronic adolescent glucocorticoid or methamphetamine on drug-induced locomotor hyperactivity and disruption of prepulse inhibition in adulthood in mice. Prog Neuropsychopharmacol Biol Psychiatry 2022; 117:110552. [PMID: 35337859 DOI: 10.1016/j.pnpbp.2022.110552] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 03/17/2022] [Accepted: 03/17/2022] [Indexed: 11/29/2022]
Abstract
Sensitization of dopaminergic activity has been suggested as an underlying mechanism in the psychotic symptoms of schizophrenia. Adolescent stress and chronic abuse of methamphetamine (Meth) are well-known risk factors for psychosis and schizophrenia; however it remains unknown how these factors compare in terms of dopaminergic behavioural sensitization in adulthood. In addition, while Brain-Derived Neurotrophic Factor (BDNF) has been implicated in dopaminergic activity and schizophrenia, its role in behavioural sensitization remains unclear. In this study we therefore compared the effect of chronic adolescent treatment with the stress hormone, corticosterone (Cort), or with Meth, on drug-induced locomotor hyperactivity and disruption of prepulse inhibition in adulthood in BDNF heterozygous mice and their wild-type controls, as well as on dopamine receptor gene expression. Between 6 and 9 weeks of age, the animals either received Cort in the drinking water or were treated with an escalating Meth dose protocol. In adulthood, Cort-pretreated mice showed significantly reduced Meth-induced locomotor hyperactivity compared to vehicle-pretreated mice. In contrast, Meth hyperlocomotion was significantly enhanced in animals pretreated with the drug in adolescence. There were no effects of either pretreatment on prepulse inhibition. BDNF Het mice showed greater Meth-induced hyperlocomotion and lower prepulse inhibition than WT mice. There were no effects of either pretreatment on D1 or D2 gene expression in either the dorsal or ventral striatum, while D3 mRNA was shown to be reduced in male mice only irrespective of genotype. These results suggest that in adolescence, chronically elevated glucocorticoid levels, a component of chronic stress, do not cause dopaminergic sensitization adulthood, in contrast to the effect of chronic Meth treatment in the same age period. BDNF does not appear to be involved in the effects of chronic Cort or chronic Meth.
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Affiliation(s)
- Lina Schonfeld
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, Australia
| | - Emily J Jaehne
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, Australia
| | - Alexandra R Ogden
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, Australia
| | - Jereme G Spiers
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Australia
| | - Samuel Hogarth
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, Australia
| | - Maarten van den Buuse
- Department of Psychology and Counselling, School of Psychology and Public Health, La Trobe University, Melbourne, Australia; Department of Pharmacology, University of Melbourne, Australia; College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, Australia.
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Varner EL, Jaquins-Gerstl A, Michael AC. Enhanced Intracranial Microdialysis by Reduction of Traumatic Penetration Injury at the Probe Track. ACS Chem Neurosci 2016; 7:728-36. [PMID: 27003503 PMCID: PMC7372793 DOI: 10.1021/acschemneuro.5b00331] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Microdialysis provides deep insight into chemical neuroscience by enabling in vivo intracranial chemical monitoring. Nevertheless, implanting a microdialysis probe causes a traumatic penetration injury (TPI) of brain tissue at the probe track. The TPI, which is clearly documented by voltammetry and histochemical imaging, is a drawback because it perturbs the exact tissue from which the brain dialysate samples are derived. Our goal is to reduce, if not eventually eliminate, the TPI and its detrimental effects on neurochemical monitoring. Here, we demonstrate that combining a 5-day wait period after probe implantation with the continuous retrodialysis of a low-micromolar concentration of dexamethasone vastly reduces the TPI. Our approach to reducing the TPI reinstates normal evoked dopamine release activity in the tissue adjacent to the microdialysis probe, brings evoked dopamine release at the probe outlet into quantitative agreement with evoked dopamine release next to the probe, reinstates normal immunoreactivity for tyrosine hydroxylase and the dopamine transporter near the probe track, and greatly suppresses glial activation and scaring near the probe track. This reduction of the TPI and reinstatement of normal evoked dopamine release activity adjacent to the probe track appears to be due to dexamethasone's anti-inflammatory actions.
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Affiliation(s)
- Erika L Varner
- Department of Chemistry, University of Pittsburgh , 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Andrea Jaquins-Gerstl
- Department of Chemistry, University of Pittsburgh , 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Adrian C Michael
- Department of Chemistry, University of Pittsburgh , 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
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Hill RA, Kiss Von Soly S, Ratnayake U, Klug M, Binder MD, Hannan AJ, van den Buuse M. Long-term effects of combined neonatal and adolescent stress on brain-derived neurotrophic factor and dopamine receptor expression in the rat forebrain. Biochim Biophys Acta Mol Basis Dis 2014; 1842:2126-35. [PMID: 25159716 DOI: 10.1016/j.bbadis.2014.08.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2014] [Revised: 08/08/2014] [Accepted: 08/18/2014] [Indexed: 11/25/2022]
Abstract
Altered brain-derived neurotrophic factor (BDNF) signalling and dopaminergic neurotransmission have been shown in the forebrain in schizophrenia. The 'two hit' hypothesis proposes that two major disruptions during development are involved in the pathophysiology of this illness. We therefore used a 'two hit' rat model of combined neonatal and young-adult stress to assess effects on BDNF signalling and dopamine receptor expression. Wistar rats were exposed to neonatal maternal separation (MS) stress and/or adolescent/young-adult corticosterone (CORT) treatment. At adulthood the medial prefrontal cortex (mPFC), caudate putamen (CPu) and nucleus accumbens (NAc) were analysed by qPCR and Western blot. The 'two hit' combination of MS and CORT treatment caused significant increases in BDNF mRNA and protein levels in the mPFC of male, but not female rats. BDNF mRNA expression was unchanged in the CPu but was significantly reduced by CORT in the NAc. DR3 and DR2 mRNA were significantly up-regulated in the mPFC of two-hit rats and a positive correlation was found between BDNF and DR3 expression in male, but not female rats. DR2 and DR3 expression were significantly increased following CORT treatment in the NAc and a significant negative correlation between BDNF and DR3 and DR2 mRNA levels was found. Our data demonstrate male-specific two-hit effects of developmental stress on BDNF and DR3 expression in the mPFC. Furthermore, following chronic adolescent CORT treatment, the relationship between BDNF and dopamine receptor expression was significantly altered in the NAc. These results elucidate the long-term effects of 'two hit' developmental stress on behaviour.
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Affiliation(s)
- Rachel A Hill
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Szerenke Kiss Von Soly
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Udani Ratnayake
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Maren Klug
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia; Department of Psychology, Swinburne University, Hawthorn, Australia
| | - Michele D Binder
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Anthony J Hannan
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia
| | - Maarten van den Buuse
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Melbourne, Australia; Department of Pharmacology and Therapeutics, University of Melbourne, Melbourne, Australia; School of Psychological Science, La Trobe University, Melbourne, Australia.
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Yu P, An S, Tai F, Wang J, Wu R, Wang B. Early social deprivation impairs pair bonding and alters serum corticosterone and the NAcc dopamine system in mandarin voles. Psychoneuroendocrinology 2013; 38:3128-38. [PMID: 24103891 DOI: 10.1016/j.psyneuen.2013.09.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 09/02/2013] [Accepted: 09/12/2013] [Indexed: 11/27/2022]
Abstract
Early life stress has a long-term negative impact on emotion, learning, memory and adult sexual behavior, and these deficits most likely impair pair bonding. Here, we investigated whether early social deprivation (ED) affects the formation of pair bonds in socially monogamous mandarin voles (Microtus mandarinus). In a partner preference test (PPT), ED-reared adult females and males did not show a preference for their partner, spent more time exploring the cage of an unfamiliar animal and directed high levels of aggression toward unfamiliar animals. In social interaction test, ED increased exploring behavior only in females, but increased movement around the partner and reduced inactivity in both males and females. Three days of cohabitation did not alter serum corticosterone levels in ED-reared males, but increased corticosterone levels in males that received bi-parental care (PC). Interestingly, serum corticosterone levels in ED- and PC-reared females declined after cohabitation. ED significantly increased basal serum corticosterone levels in males, but had no effect on females. ED significantly up-regulated the levels of dopamine and the mRNA expression of dopamine 1-type receptor (D1R) in the nucleus accumbens (NAcc) in females and males. ED suppressed dopamine 2-type receptor mRNA (D2R) expression in females, but increased this in males. After three days of cohabitation, levels of D1R mRNA and D2R mRNA expression changed in opposite directions in PC-reared voles, but in the same direction in ED-reared males, and only the expression of D2R mRNA increased in ED-reared females. Our results indicate that early social deprivation inhibits pair bonding at adulthood. This inhibition is possibly associated with sex-specific alterations in serum corticosterone, levels of dopamine and mRNA expression of two types of dopamine receptors in the NAcc.
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Affiliation(s)
- Peng Yu
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi'an 710062, China
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Rotter A, Biermann T, Amato D, Schumann G, Desrivieres S, Kornhuber J, Müller CP. Glucocorticoid receptor antagonism blocks ethanol-induced place preference learning in mice and attenuates dopamine D2 receptor adaptation in the frontal cortex. Brain Res Bull 2012; 88:519-24. [PMID: 22609622 DOI: 10.1016/j.brainresbull.2012.05.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 04/25/2012] [Accepted: 05/08/2012] [Indexed: 10/28/2022]
Abstract
The glucocorticoid receptor (GR) plays an important role in alcohol (EtOH) self-administration behaviour by its interaction with the dopaminergic (DA) system in the brain. Here we asked whether the GR is also involved in the establishment of EtOH-induced conditioned place preference (CPP) by an interaction with the DA systems in terminal projection areas. We found that the establishment of an EtOH (2 g/kg, i.p.)-induced CPP was paralleled by a decrease in frontal cortex DA D2 receptor mRNA expression, but not in local D2 gene promoter methylation rate. No effect in other brain areas, nor on DA transporter or DA receptor regulating factor mRNA was found. The GR antagonist, RU486 (20 mg/kg, i.p.) blocked the establishment of EtOH CPP and prevented DA D2 receptor adaptations. These data may suggest a role of glucocorticoid receptor mediated D2 adaptations in the establishment of the reinforcing effects of EtOH.
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Affiliation(s)
- Andrea Rotter
- Department of Psychiatry and Psychotherapy, University of Erlangen-Nuremberg, Schwabachanlage 6, 91054 Erlangen, Germany
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Yu P, An S, Tai F, Zhang X, He F, Wang J, An X, Wu R. The effects of neonatal paternal deprivation on pair bonding, NAcc dopamine receptor mRNA expression and serum corticosterone in mandarin voles. Horm Behav 2012; 61:669-77. [PMID: 22421629 DOI: 10.1016/j.yhbeh.2012.02.028] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2011] [Revised: 02/29/2012] [Accepted: 02/29/2012] [Indexed: 11/30/2022]
Abstract
High levels of paternal care are important for the development of social behavior in monogamous rodents. However, the effects of paternal care on the formation of pair bonding and underlying neuroendocrine mechanisms, especially the involvements of dopamine system and corticosterone, are not well understood. We investigated effects of paternal deprivation on pair bonding in mandarin voles (Microtus mandarinus), a socially monogamous rodent. Paternal deprivation was found to inhibit the formation of pair bonding in females according to partner preference tests (PPT). Paternal deprivation also reduced body contact behavior and increased aggression in males and females in PPT. During social interaction tests (SIT), paternal deprivation was found to reduce investigative and aggressive behaviors but increase body contact and self-grooming in females, and reduce staring, aggression, body contact and self-grooming in males when interacting with the opposite sex. Paternal deprivation reduced the expression of dopamine 1-type receptor (D1R) mRNA and dopamine 2-type receptor (D2R) mRNA in the nucleus accumbens of female offspring in later life, but enhanced mRNA expression of these two dopamine receptors in males. After three days of cohabitation the expression of D1R mRNA and D2R mRNA was negatively correlated for voles reared by two parents, but positively correlated in paternally deprived animals. Paternal deprivation reduced serum corticosterone levels in females but had the opposite effect in males. Three days of cohabitation did not alter corticosterone levels of PD females, but reduced it in PC females. Our results provide substantial evidence that paternal deprivation inhibits the formation of pair bonding in female mandarin voles and alters social behavior later in life. These behavioral variations were possibly associated with sex-specific alterations in the expression of two types of dopamine receptors and serum corticosterone levels induced by paternal deprivation.
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Affiliation(s)
- Peng Yu
- Institute of Brain and Behavioral Sciences, College of Life Sciences, Shaanxi Normal University, Xi'an 710062, China
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Lee JH, Ko E, Kim YE, Min JY, Liu J, Kim Y, Shin M, Hong M, Bae H. Gene expression profile analysis of genes in rat hippocampus from antidepressant treated rats using DNA microarray. BMC Neurosci 2010; 11:152. [PMID: 21118505 PMCID: PMC3009642 DOI: 10.1186/1471-2202-11-152] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2010] [Accepted: 11/30/2010] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND The molecular and biological mechanisms by which many antidepressants function are based on the monoamine depletion hypothesis. However, the entire cascade of mechanisms responsible for the therapeutic effect of antidepressants has not yet been elucidated. RESULTS We used a genome-wide microarray system containing 30,000 clones to evaluate total RNA that had been isolated from the brains of treated rats to identify the genes involved in the therapeutic mechanisms of various antidepressants, a tricyclic antidepressant (imipramine). a selective serotonin reuptake inhibitor (fluoxetine), a monoamine oxidase inhibitor (phenelzine) and psychoactive herbal extracts of Nelumbinis Semen (NS). To confirm the differential expression of the identified genes, we analyzed the amount of mRNA that was isolated from the hippocampus of rats that had been treated with antidepressants by real-time RT-PCR using primers specific for selected genes of interest. These data demonstrate that antidepressants interfere with the expression of a large array of genes involved in signaling, survival and protein metabolism, suggesting that the therapeutic effect of these antidepressants is very complex. Surprisingly, unlike other antidepressants, we found that the standardized herbal medicine, Nelumbinis Semen, is free of factors that can induce neurodegenerative diseases such as caspase 8, α-synuclein, and amyloid precursor protein. In addition, the production of the inflammatory cytokine, IFNγ, was significantly decreased in rat hippocampus in response to treatment with antidepressants, while the inhibitory cytokine, TGFβ, was significantly enhanced. CONCLUSIONS These results suggest that antidepressants function by regulating neurotransmission as well as suppressing immunoreactivity in the central nervous system.
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Affiliation(s)
- Jun-Ho Lee
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Eunjung Ko
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Young-Eun Kim
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Ji-Young Min
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Jian Liu
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Yangseok Kim
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Minkyu Shin
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Moochang Hong
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
| | - Hyunsu Bae
- Department of Physiology, College of Oriental Medicine, Kyung Hee University, Hoegi-Dong, Dongdaemun-Ku, Seoul 130-701, Korea
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Psychotropic drug-induced locomotor hyperactivity and prepulse inhibition regulation in male and female aromatase knockout (ArKO) mice: role of dopamine D1 and D2 receptors and dopamine transporters. Psychopharmacology (Berl) 2009; 206:267-79. [PMID: 19597801 DOI: 10.1007/s00213-009-1604-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Accepted: 06/24/2009] [Indexed: 10/20/2022]
Abstract
RATIONALE AND OBJECTIVES The aim of the present study was to investigate the possible role of oestrogen in schizophrenia by comparing aromatase knockout (ArKO) mice, which are unable to produce oestrogen, with wild-type controls using two behavioural animal models with relevance to the illness, psychotropic drug-induced locomotor hyperactivity and prepulse inhibition (PPI). RESULTS Baseline PPI was not different between ArKO and controls. Treatment with apomorphine, MK-801 and amphetamine caused disruption of PPI in all groups. However, in female but not male ArKO mice, the effect of both apomorphine and amphetamine was reduced. In female ArKO mice, amphetamine-induced hyperlocomotion was markedly reduced, but in male mice, the genotype difference was far smaller. Female but not male ArKO mice also showed a reduction of phencyclidine-induced locomotor hyperactivity. The density of dopamine transporters, but not D1 and D2 receptors, was significantly increased in the caudate putamen of male but not female ArKO mice compared to wild-type mice. This could represent a compensatory dopaminergic upregulation in male ArKO mice. CONCLUSION Because of their lack of oestrogen production, it was anticipated that ArKO mice would display enhanced effects of amphetamine on locomotor activity and PPI. Instead, in these animals, aromatase knockout appeared to be 'protective'. This may represent limitations in the ability to model a complex illness such as schizophrenia in a constitutive knockout model, such as ArKO mice. Moreover, the current results may point at the involvement of other sex steroids, which are also altered in ArKO mice, in dopaminergic control of behaviour.
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Lee SH, Jang MK, Kim OS, Lee OH, Kim NY, Yoo KH, Lee DG, Shong YH, Mouradian MM. Activation of the GDNF-inducible transcription factor (GIF) gene promoter by glucocorticoid and progesterone. J Steroid Biochem Mol Biol 2009; 115:30-5. [PMID: 19429458 DOI: 10.1016/j.jsbmb.2009.02.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2007] [Revised: 02/10/2009] [Accepted: 02/12/2009] [Indexed: 11/29/2022]
Abstract
Steroid hormones, especially glucocorticoids, exert physiologic effects on dopaminergic neurotransmission and have been implicated in several dopamine-mediated neuropsychiatric conditions. D(2) dopamine receptor gene expression is regulated by the zinc finger-type nuclear protein GDNF-inducible transcription factor (GIF). In this study, we sought to investigate if steroids could regulate transcription of the GIF gene itself. Transient co-transfection of the D(2) expressing neuroblastoma cell line NB41A3 with GIF promoter-luciferase constructs along with expression vectors for steroid hormone receptors showed that activation of glucocorticoid receptors but not estrogen receptors up-regulates transcription from the GIF promoter 5.0-fold. Progesterone receptors, which share the same consensus DNA recognition sequence as glucocorticoid receptors, also activated the GIF promoter. Serial 5'-deletion mutants of the GIF gene upstream region localized the glucocorticoid-responsive segment between nucleotides -128 and -66 relative to the transcription start site. This region contains a putative glucocorticoid-responsive element/progesterone-responsive element (GRE/PRE). Additionally, this fragment of the GIF gene 5'-upstream region activated the heterologous herpes simplex virus thymidine kinase (TK) promoter, which is known to be glucocorticoid and progesterone responsive. Furthermore, glucocorticoid receptor activation up-regulated endogenous GIF gene mRNA expression in NB41A3 cells. These observations demonstrate a molecular basis for glucocorticoid and progesterone-induced up-regulation of GIF gene transcription and provide a mechanism for the modulation of dopamine-mediated behaviors by these hormones.
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Affiliation(s)
- Sang-Hyeon Lee
- Department of Bioscience and Biotechnology, Silla University, Gwaebop-dong, Sasang-Gu, Busan, Republic of Korea
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Dietz DM, Dietz KC, Moore S, Ouimet CC, Kabbaj M. Repeated social defeat stress-induced sensitization to the locomotor activating effects of d-amphetamine: role of individual differences. Psychopharmacology (Berl) 2008; 198:51-62. [PMID: 18415082 DOI: 10.1007/s00213-008-1078-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2007] [Accepted: 01/09/2008] [Indexed: 10/22/2022]
Abstract
RATIONALE In this study, we sought to examine individual differences in stress-induced behavioral sensitization to d-amphetamine after repeated social defeat stress. In an effort to understand what mechanisms underlie stress-induced sensitization to d-amphetamine, we examined striatal gene expression of the dopamine receptor D(2). Additionally, we investigated if repeated social defeat was associated with changes in dendritic spine density in the hippocampus, prefrontal cortex, and nucleus accumbens of rats that exhibit stress-induced sensitization. METHODS Male rats were classified into high responders (HR) and low responders (LR) based on their locomotor response to a novel environment. Then, rats were either handled as a control or defeated on four occasions by aggressive rats. Two weeks after the last defeat, animals were challenged with one of three doses of d-amphetamine and their locomotor activity was recorded. RESULTS Non-defeated HR rats exhibited higher locomotor activity in response to d-amphetamine when compared to LR non-defeated rats. Fourteen days from the last repeated social defeat, LR rats and HR rats were behaviorally identical in response to acute injections of amphetamine. Furthermore, HR non-defeated rats had less D(2) mRNA expression in the nucleus accumbens core and dorsal striatum than do LR non-defeated rats. However, after repeated social defeat, HR and LR rats had identical D(2) mRNA expression in both the core and dorsal striatum. Finally, there were no changes in dendritic spine density in any of the brain areas examined in LR rats. CONCLUSION Repeated social defeat abolishes individual differences in behavioral responses to d-amphetamine which may be due to a down-regulation of striatal dopamine D(2) receptors in LR rats.
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Affiliation(s)
- D M Dietz
- Department of Biomedical Sciences, Program in Neuroscience, Florida State University, Tallahassee, FL, 32306, USA
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Van Craenenbroeck K, De Bosscher K, Vanden Berghe W, Vanhoenacker P, Haegeman G. Role of glucocorticoids in dopamine-related neuropsychiatric disorders. Mol Cell Endocrinol 2005; 245:10-22. [PMID: 16310935 DOI: 10.1016/j.mce.2005.10.007] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2005] [Accepted: 10/14/2005] [Indexed: 01/12/2023]
Abstract
'Psychoneuroendocrinology' is now quickly emerging as a hot interdisciplinary research field that addresses the interplay between neuronal and endocrine signaling in psychiatric diseases. Both glucocorticoid hormones and dopamine have an important role in maintaining normal brain functions. In this review, molecular and mechanistic aspects of glucocorticoid effects on brain function and behavior will be discussed with specific reference to dopamine signaling.
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Affiliation(s)
- Kathleen Van Craenenbroeck
- Laboratory for Eukaryotic Gene Expression and Signal Transduction, LEGEST, Department of Molecular Biology, Ghent University-UGent, K.L. Ledeganckstraat 35, 9000 Gent, Belgium
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Ingram N, Martin S, Wang JH, van der Laan S, Loiacono R, van den Buuse M. Interaction of corticosterone and nicotine in regulation of prepulse inhibition in mice. Neuropharmacology 2005; 48:80-92. [PMID: 15617730 DOI: 10.1016/j.neuropharm.2004.08.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2004] [Revised: 08/13/2004] [Accepted: 08/20/2004] [Indexed: 01/16/2023]
Abstract
The aim of the present study was to investigate if different levels of circulating corticosterone (CORT) modulate the effect of nicotine on prepulse inhibition (PPI), a measure of sensorimotor gating that is disrupted in schizophrenia and other mental illnesses. Four groups of mice were investigated: sham-operated, adrenalectomized (ADX) and implanted with a cholesterol pellet, ADX and implanted with a 10 mg CORT pellet, or ADX and 50 mg of CORT. Different CORT levels or doses of nicotine did not significantly affect startle responses. Baseline PPI was significantly reduced in mice implanted with the highest dose of CORT. In ADX mice implanted with cholesterol, nicotine treatment influenced PPI depending on the prepulse intensity. In ADX mice implanted with 50 mg of CORT, treatment with 10 mg/kg of nicotine caused a significant increase in PPI at all prepulse intensities. Binding studies showed that corticosterone treatment had significantly affected nicotinic acetylcholine receptor (nAChR) density in the mouse brain. Treatment with 50 mg CORT decreased 125I-epibatidine binding in the globus pallidus and 125I-alpha-bungarotoxin binding in the claustrum. These results suggest a possible interaction of corticosterone and nicotine at the level of the alpha4- and alpha7-type nAChR in the regulation of PPI. In situations of high circulating levels of corticosterone, nicotine may be beneficial to restore disruption of PPI.
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Affiliation(s)
- Nicola Ingram
- Behavioural Neuroscience Laboratory, Mental Health Research Institute, Parkville, Melbourne, Australia
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Lucas LR, Celen Z, Tamashiro KLK, Blanchard RJ, Blanchard DC, Markham C, Sakai RR, McEwen BS. Repeated exposure to social stress has long-term effects on indirect markers of dopaminergic activity in brain regions associated with motivated behavior. Neuroscience 2004; 124:449-57. [PMID: 14980394 DOI: 10.1016/j.neuroscience.2003.12.009] [Citation(s) in RCA: 129] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2003] [Indexed: 11/16/2022]
Abstract
The visible burrow system (VBS) is a chronic social stress paradigm in which a dominance hierarchy forms among male rats housed with females. Males in the VBS undergo behavioral and physiological changes thought to be manifestations of chronic social stress. Since it is unclear whether chronic social stress affects motivation and reward behavior, brain areas related to these regions were examined. Long-term effects of a single or repeated VBS exposure on mesolimbic subregions were investigated by exposing rats to the VBS either once (one cycle of VBS housing and recovery) or repeatedly (three cycles). Behavior in the VBS was observed and rats were classified as dominants or subordinates. Subordinates were further sub-classified on the basis of stress hormone (corticosterone) response to an acute stressor (i.e. restraint stress). Normal responders were categorized as stress-responsive subordinates (SRS) and animals with a blunted hypothalamic-pituitary-adrenal axis response were designated as non-responsive subordinates (NRS). Controls males were pair-housed with a single female during VBS periods and alone during recovery. Lowered enkephalin-mRNA levels were observed in the nucleus accumbens (Acb) after single VBS exposure in SRS and repeated VBS exposure both subordinate groups (i.e. SRS + NRS) compared with controls. Decreased dopamine transporter density was detected after single VBS exposure in the dorsolateral caudate putamen (DLCPu) of NRS and after repeated VBS exposure in the Acb of NRS compared with controls. Dopamine D2 receptor density was elevated after single VBS exposure in the Acb of both subordinate groups (SRS + NRS) and after repeated VBS exposure in the DLCPu, dorsomedial CPu, and Acb of NRS compared with controls. No changes in dopamine D1 receptor binding were observed in any group. These results suggest that long-term changes in dopamine activity in mesolimbic structures persist after repeated exposures to chronic social stress and may provide insight into the neurochemical basis of depressive illness and subsequent comorbidity with drug abuse vulnerability.
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Affiliation(s)
- L R Lucas
- Laboratory of Endocrinology, Box 165, 1230 York Avenue, Rockefeller University, New York, NY 10021, USA.
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Barros VG, Berger MA, Martijena ID, Sarchi MI, Pérez AA, Molina VA, Tarazi FI, Antonelli MC. Early adoption modifies the effects of prenatal stress on dopamine and glutamate receptors in adult rat brain. J Neurosci Res 2004; 76:488-96. [PMID: 15114621 DOI: 10.1002/jnr.20119] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Stressful stimuli during pregnancy induce complex effects that influence the development of offspring. These effects can be prevented by environmental manipulations during the early postnatal period. Repeated restraint during the last week of pregnancy was used as a model of prenatal stress, and adoption at birth was used to change the postnatal environment. No differences were found in various physical landmarks, except for testis descent, for which all prenatally stressed pups showed a 1-day delay in comparison with control rats, regardless of the postnatal adoption procedure. Levels of dopamine (DA) D(2) and glutamate (Glu) N-methyl-D-aspartate (NMDA) receptors were differentially regulated in different forebrain regions of cross-fostered adult offspring. Increased concentrations of cortical D(2) receptors detected in stressed pups, raised by a gestationally stressed biological mother, were not detected when the pups were raised by a control mother. Control pups raised by a foster mother whether gestationally stressed or not had higher levels of NMDA receptors in cortical areas. These findings suggest that the normal expression of DA and Glu receptors is influenced by in utero experience and by lactation. The complex pattern of receptor changes reflects the high vulnerability of DA and Glu systems to variations both in prenatal and in postnatal environment, particularly for cortical D(2) receptors and NMDA receptors in cerebral cortex and nucleus accumbens. In contrast, testis descent appears to be more susceptible to prenatal than to postnatal environmental events.
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Affiliation(s)
- Virginia G Barros
- Instituto de Química y Fisicoquímica Biológicas (UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Buenos Aires, Argentina
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15
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Barros VG, Boado LA, Adamo AM, Caviedes R, Caviedes P, Antonelli MC. Corticosterone down-regulates dopamine D4 receptor in a mouse cerebral cortex neuronal cell line. Neurotox Res 2003; 5:369-73. [PMID: 14715455 DOI: 10.1007/bf03033156] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
We have previously reported that restraint stress applied to the gestant mother results in long-lasting effects in the offspring that show an increase in the number of dopamine D2-type receptors in limbic areas on the adult rat brain cortex. Evidence that stress during pregnancy results in activation of the hypothalamic-pituitary-adrenal (HPA) axis has been extensively demonstrated. Therefore, high levels of corticosterone secreted in response to stress by the gestant mother might be one of the predisposing factors for the changes observed in dopamine receptors in the adult rat brain. In this study we addressed the question whether corticosterone would directly up-regulate D2-type receptors in vitro. We have investigated the effect of different concentrations of corticosterone on D4 dopamine receptor in immortalized cell lines from cerebral cortex of normal mouse fetuses, detected by immunocytochemistry employing polyclonal antibodies generated against synthetic peptides homologous to an extracellular domain of D4 receptor. The results show that corticosterone in vitro decreases the number of dopamine D4 receptors, suggesting that the increase of D2-type receptors in adult rats following prenatal stress is not related to a direct action of corticosterone on receptor expression.
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Affiliation(s)
- Virginia G Barros
- Instituto de Quimica y Fisicoquimica Biologicas (UBA-CONICET), Facultad de Farmacia y Bioquimica, Universidad de Buenos Aires, Junin 956, 1113 Buenos Aires, Argentina
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16
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Abstract
Noninvasive administration of cortisol through the diet resulted in relatively rapid (<1.5 h) and highly reproducible increases in plasma cortisol in rainbow trout, comparable to changes seen in fish subjected to substantial stress. Juvenile rainbow trout were reared in isolation for 1 week, before their daily food ration was replaced by a meal of cortisol-treated food corresponding to 6 mg cortisol kg(-1). All fish were observed for 30 min, beginning at 1 or 48 h following the introduction of cortisol-treated food. Additional cortisol (75% of the original dose on Day 2, and 50% on Day 3) was administered to the long-term cortisol-treated group. The resulting blood plasma concentrations of cortisol were similar in short- and long-term treated fish, and corresponded to those previously seen in stressed rainbow trout. Controls were fed similar food without cortisol. Half of the fish from each treatment group (controls and short- and long-term cortisol) were subjected to an intruder test (a smaller conspecific introduced into the aquarium), while half of the fish were observed in isolation. In fish challenged by a conspecific intruder, short-term cortisol treatment stimulated locomotor activity, while long-term treatment inhibited locomotion. Aggressive behavior was also inhibited by long-term cortisol treatment, but not by short-term exposure to cortisol. Cortisol treatment had no effect on locomotor activity in undisturbed fish, indicating that the behavioral effects of cortisol were mediated through interaction with other signal systems activated during the simulated territorial intrusion test. This study demonstrates for the first time that cortisol has time- and context-dependent effects on behavior in teleost fish.
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Affiliation(s)
- Øyvind Øverli
- Evolutionary Biology Centre, Department of Animal Development and Genetics, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden.
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17
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Cyr M, Morissette M, Barden N, Beaulieu S, Rochford J, Di Paolo T. Dopaminergic activity in transgenic mice underexpressing glucocorticoid receptors: effect of antidepressants. Neuroscience 2001; 102:151-8. [PMID: 11226678 DOI: 10.1016/s0306-4522(00)00444-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Transgenic mice bearing a transgene coding for a glucocorticoid receptor antisense mRNA, which partially blocks glucocorticoid receptor expression, were used to investigate the long-term effect of hypothalamic-pituitary-adrenal axis dysfunction on brain dopamine transmission. Compared to control mice, the transgenic animals showed increased amphetamine-induced locomotor activity and increased concentrations of striatal dopamine and its metabolites dihydroxyphenylacetic acid and homovanillic acid. Binding of [3H]SCH 23390 and [3H]spiperone to, respectively, D1 and D2 dopamine receptors was increased in transgenic mice. In contrast, autoradiography of striatal [3H]GBR 12935 binding to the dopamine transporter was decreased and the mRNA levels of this transporter, measured by in situ hybridization, remained unchanged in the substantia nigra pars compacta. The effect of chronic treatment for two weeks with amitriptyline or fluoxetine was compared in control and transgenic mice. No significant changes were observed in control mice following antidepressant treatment, whereas in transgenic mice both antidepressants reduced striatal [3H]SCH 23390 and [3H]raclopride specific binding to D1 and D2 receptors. Amitriptyline, but not fluoxetine, increased striatal [3H]GBR 12935 binding to the dopamine transporter, whereas its mRNA level in the substantia nigra pars compacta was decreased in fluoxetine, compared to vehicle- or amitriptyline-treated transgenic mice. From these results we suggest that hyperactive dopaminergic activity of the nigrostriatal pathway controls motor activity in the transgenic mice. Furthermore, antidepressant treatment corrected the increased striatal D1 and D2 receptors and decreased dopamine transporter levels in the transgenic mice.
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MESH Headings
- Amitriptyline/pharmacology
- Animals
- Antidepressive Agents/pharmacology
- Binding Sites/drug effects
- Binding Sites/physiology
- Carrier Proteins/drug effects
- Carrier Proteins/genetics
- Carrier Proteins/metabolism
- Depression/metabolism
- Depression/physiopathology
- Disease Models, Animal
- Dopamine/metabolism
- Dopamine Plasma Membrane Transport Proteins
- Female
- Fluoxetine/pharmacology
- Hypothalamo-Hypophyseal System/metabolism
- Hypothalamo-Hypophyseal System/physiopathology
- Male
- Membrane Glycoproteins
- Membrane Transport Proteins
- Mice
- Mice, Transgenic
- Motor Activity/drug effects
- Motor Activity/physiology
- Neostriatum/drug effects
- Neostriatum/metabolism
- Nerve Tissue Proteins
- Neurons/drug effects
- Neurons/metabolism
- Receptors, Dopamine D1/drug effects
- Receptors, Dopamine D1/metabolism
- Receptors, Dopamine D2/drug effects
- Receptors, Dopamine D2/metabolism
- Receptors, Glucocorticoid/drug effects
- Receptors, Glucocorticoid/genetics
- Receptors, Glucocorticoid/metabolism
- Stress, Physiological/metabolism
- Stress, Physiological/physiopathology
- Substantia Nigra/drug effects
- Substantia Nigra/metabolism
- Substantia Nigra/physiopathology
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Affiliation(s)
- M Cyr
- Molecular Endocrinology Research Center, CHUQ and Faculty of Pharmacy, Laval University, PQ, Quebec, Canada
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18
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Øverli Ø, Pottinger TG, Carrick TR, Øverli E, Winberg S. Brain monoaminergic activity in rainbow trout selected for high and low stress responsiveness. BRAIN, BEHAVIOR AND EVOLUTION 2001; 57:214-24. [PMID: 11641559 DOI: 10.1159/000047238] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This paper investigates whether two lines of rainbow trout displaying genetically determined variation in stress responsiveness and behavior also show differences in brain monoaminergic activity. In several brain regions, strains of rainbow trout selected for consistently high or low post-stress cortisol levels displayed differences in tissue concentrations of monoamines and/or monoamine metabolites, or in metabolite/monoamine ratios. High-responsive trout reacted to stress by an increase in the concentrations of both serotonin (brain stem), dopamine (brain stem), and norepinephrine (optic tectum, telencephalon), whereas low-responsive fish did not. Brain stem and optic tectum concentrations of monoamine metabolites were also elevated after stress in high responders, but not in low-responsive fish. The simultaneous increase in the concentration of monoamines and their metabolites suggests that both synthesis and metabolism of these transmitters were elevated after stress in high-responsive trout. A divergent pattern was seen in the hypothalamus, where low-responsive fish displayed elevated levels of 5-hydroxyindoleacetic acid (a serotonin metabolite) and 3-methoxy-4-hydroxyphenylglycol (a norepinephrine metabolite). In the telencephalon, both populations had elevated concentrations of these metabolites after stress. These results clearly suggest that selection for stress responsiveness in rainbow trout is also associated with changes in the function of brain monoaminergic systems. The possible functional significance of these observations is discussed with respect to the physiological and behavioral profile of these strains of fish. Literature is reviewed showing that several factors affecting brain monoaminergic activity might be altered by selection for stress responsiveness, or alternatively be under direct influence of circulating glucocorticoids.
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Affiliation(s)
- Ø Øverli
- Evolutionary Biology Centre, Department of Animal Development and Genetics, Uppsala University, Uppsala, Sweden.
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Barrot M, Abrous DN, Marinelli M, Rougé-Pont F, Le Moal M, Piazza PV. Influence of glucocorticoids on dopaminergic transmission in the rat dorsolateral striatum. Eur J Neurosci 2001; 13:812-8. [PMID: 11207816 DOI: 10.1046/j.1460-9568.2001.01434.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Glucocorticoid hormones exert strong influences on central neurotransmitter systems. In the present work, we examined the functional consequences of corticosterone suppression on the dopaminergic transmission in the dorsolateral striatum by studying the expression of Fos-like proteins and extracellular dopamine levels. Glucocorticoid hormones were suppressed by adrenalectomy, and the specificity of the effects assessed by restoring physiological plasmatic corticosterone concentrations. We show that, in the dorsolateral striatum, glucocorticoids modify postsynaptic dopaminergic transmission. Suppression of glucocorticoids decreased the induction of Fos proteins in response to a direct agonist of dopamine D(1) receptors (SKF 82958, 1.5 mg/kg, i.p.), but not the release of dopamine induced by morphine (2 mg/kg, s.c.) or the density of the limiting enzyme of dopamine synthesis, tyrosine hydroxylase. In contrast to the dopaminergic response to morphine, the response to cocaine (15 mg/kg, i.p.) was modified by the suppression of corticosterone. In this case, adrenalectomy increased cocaine-induced changes in extracellular dopamine but did not modify the expression of Fos-like proteins. This absence of changes in cocaine-induced Fos-like proteins might result from a compensatory mechanism between the increase in the dopaminergic response and the decrease in the functional activity of dopamine D(1) receptors. The increased dopaminergic response to cocaine also contrasts with the decreased response previously observed in the shell of the nucleus accumbens [Barrot et al. (2000) Eur. J. Neurosci., 12, 973-979]. The present data highlight the profound heterogeneous influence of glucocorticoids within dopaminergic projections.
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Affiliation(s)
- M Barrot
- Psychobiologie des Comportements Adaptatifs, INSERM U259, Université Victor Segalen Bordeaux 2, Rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France
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Barrot M, Marinelli M, Abrous DN, Rougé-Pont F, Le Moal M, Piazza PV. The dopaminergic hyper-responsiveness of the shell of the nucleus accumbens is hormone-dependent. Eur J Neurosci 2000; 12:973-9. [PMID: 10762327 DOI: 10.1046/j.1460-9568.2000.00996.x] [Citation(s) in RCA: 170] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The dopaminergic projection to the shell of the nucleus accumbens is the most reactive to stress, reward and drugs of abuse and this subregion of the nucleus accumbens is also considered a target of therapeutic effects of atypical antipsychotic drugs (APD). In this report we show, by means of in vivo microdialysis and Fos immunohistochemistry, that the hyper-responsiveness which characterizes the dopaminergic transmission to the shell is dependent on glucocorticoid hormones. In Sprague-Dawley rats, after suppression of endogenous glucocorticoids by adrenalectomy, extracellular dopamine levels selectively decreased in the shell, whilst they remained unchanged in the core. This effect was observed in basal conditions, after a mild stress (vehicle injection), as well as after subcutaneous administration of morphine (2 mg/kg, s.c. ) or intraperitoneal injection of cocaine (15 mg/kg, i.p.). The decrease in dopamine observed in the shell had a postsynaptic impact, as shown by less induction of Fos-like proteins selectively in the shell in response to cocaine. However, the induction of Fos-like proteins by the full D1 agonist SKF82958 (1.5 mg/kg, i.p.) remained unchanged after adrenalectomy, suggesting that the changes in Fos expression after cocaine injection were likely to depend on changes in extracellular dopamine levels rather than on changes in postsynaptic sensitivity to dopamine. The effects of adrenalectomy were glucocorticoid-specific given that they were prevented by corticosterone treatment. This anatomical specificity in the control of neuronal activity by a hormonal input highlights the role of steroid hormones in shaping the functional activity of the brain.
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Affiliation(s)
- M Barrot
- Psychobiologie des Comportements Adaptatifs, INSERM U259, Université Victor Segalen Bordeaux2, Domaine de Carreire, Rue Camille Saint-Saëns, 33077 Bordeaux Cedex, France
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