1
|
Fahrenkopf A, Li G, Wood RI, Wagner CK. Developmental exposure to the synthetic progestin, 17α-hydroxyprogesterone caproate, disrupts the mesocortical serotonin pathway and alters impulsive decision-making in rats. Dev Neurobiol 2021; 81:763-773. [PMID: 34318625 PMCID: PMC8440456 DOI: 10.1002/dneu.22847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 07/20/2021] [Accepted: 07/23/2021] [Indexed: 01/25/2023]
Abstract
The synthetic progestin, 17α-hydroxyprogesterone caproate (17-OHPC), is administered to women at risk for preterm birth during a critical period of fetal development for mesocortical pathways. Yet, little information is available regarding the potential effects of 17-OHPC on the developing fetal brain. In rat models, the mesocortical serotonin pathway is sensitive to progestins. Progesterone receptor (PR) is expressed in layer 3 pyramidal neurons of medial prefrontal cortex (mPFC) and in serotonergic neurons of the dorsal raphe. The present study tested the hypothesis that exposure to 17-OHPC during development disrupts serotonergic innervation of the mPFC in adolescence and impairs behavior mediated by this pathway in adulthood. Administration of 17-OHPC from postnatal days 1-14 decreased the density of SERT-ir fibers within superficial and deep layers and decreased the density of synaptophysin-ir boutons in all layers of prelimbic mPFC at postnatal day 28. In addition, rats exposed to 17-OHPC during development were less likely to make impulsive choices in the Delay Discounting task, choosing the larger, delayed reward more often than controls at moderate delay times. Interestingly, 17-OHPC exposed rats were more likely to fail to make any choice (i.e., increased omissions) compared to controls at longer delays, suggesting disruptions in decision-making. These results suggest that further investigation is warranted in the clinical use of 17-OHPC to better inform a risk/benefit analysis of progestin use in pregnancy.
Collapse
Affiliation(s)
- Allyssa Fahrenkopf
- Psychogenics Inc. Paramus, NJ USA
- Department of Psychology & Center for Neuroscience Research, University at Albany, Albany, NY USA
| | - Grace Li
- Department of Integrative Anatomical Sciences, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA
| | - Ruth I. Wood
- Department of Integrative Anatomical Sciences, Keck School of Medicine of the University of Southern California, Los Angeles, CA, USA
| | - Christine K. Wagner
- Department of Psychology & Center for Neuroscience Research, University at Albany, Albany, NY USA
| |
Collapse
|
2
|
Babić Leko M, Hof PR, Šimić G. Alterations and interactions of subcortical modulatory systems in Alzheimer's disease. PROGRESS IN BRAIN RESEARCH 2021; 261:379-421. [PMID: 33785136 DOI: 10.1016/bs.pbr.2020.07.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The pathogenesis of Alzheimer's disease (AD) is not fully understood. Here we summarize current knowledge on the involvement of the serotonergic, noradrenergic, dopaminergic, cholinergic, and opioid systems in AD, emphasizing the importance of interactions between the serotonergic and the other subcortical modulatory systems during the progression of AD. In physiological conditions, all neurotransmitter systems function in concert and are interdependent at both the neuroanatomical and molecular levels. Through their early involvement in AD, cognitive and behavioral abilities that rely on their interactions also become disrupted. Considering that serotonin (5HT) regulates the release of noradrenaline (NA), dopamine (DA) and acetylcholine (ACh), any alteration in 5HT levels leads to disturbance of NA, DA, and ACh homeostasis in the brain. One of the earliest pathological changes during the prodromal phase of AD is a decrease of serotonergic transmission throughout the brain, with serotonergic receptors being also affected. Additionally, serotonergic and noradrenergic as well as serotonergic and dopaminergic nuclei are reciprocally interconnected. As the serotonergic dorsal raphe nucleus (DRN) is affected by pathological changes early in AD, and the noradrenergic locus coeruleus (LC) and dopaminergic ventral tegmental area (VTA) exhibit AD-related pathological changes, their connectivity also becomes altered in AD. Such disrupted interactions among neurotransmitter systems in AD can be used in the development of multi-target drugs. Some of the potential AD therapeutics (such as ASS234, RS67333, tropisetron) target multiple neurotransmitter systems to achieve the best possible improvement of cognitive and behavioral deficits observed in AD. Here, we review how serotonergic system interacts with other subcortical modulatory systems (noradrenergic, dopaminergic, cholinergic, and opioid systems) during AD.
Collapse
Affiliation(s)
- Mirjana Babić Leko
- Department for Neuroscience, Croatian Institute for Brain Research, University of Zagreb Medical School, Zagreb, Croatia
| | - Patrick R Hof
- Nash Family Department of Neuroscience, Friedman Brain Institute, and Ronald M. Loeb Center for Alzheimer's Disease, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Goran Šimić
- Department for Neuroscience, Croatian Institute for Brain Research, University of Zagreb Medical School, Zagreb, Croatia.
| |
Collapse
|
3
|
Ganella DE, Lee-Kardashyan L, Luikinga SJ, Nguyen DLD, Madsen HB, Zbukvic IC, Coulthard R, Lawrence AJ, Kim JH. Aripiprazole Facilitates Extinction of Conditioned Fear in Adolescent Rats. Front Behav Neurosci 2017; 11:76. [PMID: 28536511 PMCID: PMC5422437 DOI: 10.3389/fnbeh.2017.00076] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 04/11/2017] [Indexed: 12/31/2022] Open
Abstract
Anxiety disorders are the most common type of mental disorder during adolescence, which is at least partly due to the resistance to extinction exhibited at this age. The dopaminergic system is known to be dysregulated during adolescence; therefore, we aimed to facilitate extinction in adolescent rats using the dopamine receptor 2 partial agonist aripiprazole (Abilify™), and examine the behavioral and neural outcomes. Adolescent rats were conditioned to fear a tone. The next day, rats received extinction 30 min after a systemic injection of either 5 mg/kg aripiprazole or vehicle, and then were tested the following day. For the immunohistochemistry experiment, naïve and "no extinction" conditions were added and rats were perfused either on the extinction day or test day. To assess the activation of neurons receiving dopaminergic input, c-Fos, and dopamine- and cAMP-regulated neuronal phosphoprotein (DARPP-32) labeled neurons were quantified in the amygdala and the medial prefrontal cortex (mPFC). Systemic treatment with aripiprazole at the time of extinction significantly reduced freezing at test the next day. This effect was not observed in rats that were fear conditioned but did not receive any extinction. Aripiprazole's facilitation of extinction was accompanied by increased activation of neurons in the mPFC. Taken together, aripiprazole represents a novel pharmacological adjunct to exposure therapy worthy of further examination. The effect of aripiprazole is related to enhanced activation of mPFC neurons receiving dopaminergic innervation.
Collapse
Affiliation(s)
- Despina E Ganella
- Behavioral Neuroscience Division, Florey Institute of Neuroscience and Mental HealthParkville, VIC, Australia.,Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Liubov Lee-Kardashyan
- Behavioral Neuroscience Division, Florey Institute of Neuroscience and Mental HealthParkville, VIC, Australia.,Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Sophia J Luikinga
- Behavioral Neuroscience Division, Florey Institute of Neuroscience and Mental HealthParkville, VIC, Australia.,Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Danny L D Nguyen
- Behavioral Neuroscience Division, Florey Institute of Neuroscience and Mental HealthParkville, VIC, Australia.,Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Heather B Madsen
- Behavioral Neuroscience Division, Florey Institute of Neuroscience and Mental HealthParkville, VIC, Australia.,Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Isabel C Zbukvic
- Behavioral Neuroscience Division, Florey Institute of Neuroscience and Mental HealthParkville, VIC, Australia.,Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Russell Coulthard
- Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Andrew J Lawrence
- Behavioral Neuroscience Division, Florey Institute of Neuroscience and Mental HealthParkville, VIC, Australia.,Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| | - Jee Hyun Kim
- Florey Department of Neuroscience and Mental Health, University of MelbourneParkville, VIC, Australia
| |
Collapse
|
4
|
Šimić G, Babić Leko M, Wray S, Harrington CR, Delalle I, Jovanov-Milošević N, Bažadona D, Buée L, de Silva R, Di Giovanni G, Wischik CM, Hof PR. Monoaminergic neuropathology in Alzheimer's disease. Prog Neurobiol 2017; 151:101-138. [PMID: 27084356 PMCID: PMC5061605 DOI: 10.1016/j.pneurobio.2016.04.001] [Citation(s) in RCA: 184] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 03/09/2016] [Accepted: 04/05/2016] [Indexed: 01/02/2023]
Abstract
None of the proposed mechanisms of Alzheimer's disease (AD) fully explains the distribution patterns of the neuropathological changes at the cellular and regional levels, and their clinical correlates. One aspect of this problem lies in the complex genetic, epigenetic, and environmental landscape of AD: early-onset AD is often familial with autosomal dominant inheritance, while the vast majority of AD cases are late-onset, with the ε4 variant of the gene encoding apolipoprotein E (APOE) known to confer a 5-20 fold increased risk with partial penetrance. Mechanisms by which genetic variants and environmental factors influence the development of AD pathological changes, especially neurofibrillary degeneration, are not yet known. Here we review current knowledge of the involvement of the monoaminergic systems in AD. The changes in the serotonergic, noradrenergic, dopaminergic, histaminergic, and melatonergic systems in AD are briefly described. We also summarize the possibilities for monoamine-based treatment in AD. Besides neuropathologic AD criteria that include the noradrenergic locus coeruleus (LC), special emphasis is given to the serotonergic dorsal raphe nucleus (DRN). Both of these brainstem nuclei are among the first to be affected by tau protein abnormalities in the course of sporadic AD, causing behavioral and cognitive symptoms of variable severity. The possibility that most of the tangle-bearing neurons of the LC and DRN may release amyloid β as well as soluble monomeric or oligomeric tau protein trans-synaptically by their diffuse projections to the cerebral cortex emphasizes their selective vulnerability and warrants further investigations of the monoaminergic systems in AD.
Collapse
Affiliation(s)
- Goran Šimić
- Department of Neuroscience, Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia.
| | - Mirjana Babić Leko
- Department of Neuroscience, Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Selina Wray
- Reta Lila Weston Institute and Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | | | - Ivana Delalle
- Department of Pathology and Laboratory Medicine, Boston University School of Medicine, Boston, MA, USA
| | - Nataša Jovanov-Milošević
- Department of Neuroscience, Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Danira Bažadona
- Department of Neurology, University Hospital Center Zagreb, Zagreb, Croatia
| | - Luc Buée
- University of Lille, Inserm, CHU-Lille, UMR-S 1172, Alzheimer & Tauopathies, Lille, France
| | - Rohan de Silva
- Reta Lila Weston Institute and Department of Molecular Neuroscience, UCL Institute of Neurology, London, UK
| | - Giuseppe Di Giovanni
- Department of Physiology and Biochemistry, Faculty of Medicine and Surgery, University of Malta, Msida, Malta
| | - Claude M Wischik
- School of Medicine and Dentistry, University of Aberdeen, Aberdeen, UK
| | - Patrick R Hof
- Fishberg Department of Neuroscience, Ronald M. Loeb Center for Alzheimer's Disease, and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| |
Collapse
|
5
|
Zbukvic IC, Ganella DE, Perry CJ, Madsen HB, Bye CR, Lawrence AJ, Kim JH. Role of Dopamine 2 Receptor in Impaired Drug-Cue Extinction in Adolescent Rats. Cereb Cortex 2016; 26:2895-904. [PMID: 26946126 PMCID: PMC4869820 DOI: 10.1093/cercor/bhw051] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Adolescent drug users display resistance to treatment such as cue exposure therapy (CET), as well as increased liability to relapse. The basis of CET is extinction learning, which involves dopamine signaling in the medial prefrontal cortex (mPFC). This system undergoes dramatic alterations during adolescence. Therefore, we investigated extinction of a cocaine-associated cue in adolescent and adult rats. While cocaine self-administration and lever-alone extinction were not different between the two ages, we observed that cue extinction reduced cue-induced reinstatement in adult but not adolescent rats. Infusion of the selective dopamine 2 receptor (D2R)-like agonist quinpirole into the infralimbic cortex (IL) of the mPFC prior to cue extinction significantly reduced cue-induced reinstatement in adolescents. This effect was replicated by acute systemic treatment with the atypical antipsychotic aripiprazole (Abilify), a partial D2R-like agonist. These data suggest that adolescents may be more susceptible to relapse due to a deficit in cue extinction learning, and highlight the significance of D2R signaling in the IL for cue extinction during adolescence. These findings inspire new tactics for improving adolescent CET, with aripiprazole representing an exciting potential pharmacological adjunct for behavioral therapy.
Collapse
Affiliation(s)
- Isabel C. Zbukvic
- Behavioral Neuroscience Division, The Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3051, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3010, Australia
| | - Despina E. Ganella
- Behavioral Neuroscience Division, The Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3051, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3010, Australia
| | - Christina J. Perry
- Behavioral Neuroscience Division, The Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3051, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3010, Australia
| | - Heather B. Madsen
- Behavioral Neuroscience Division, The Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3051, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3010, Australia
| | - Christopher R. Bye
- Behavioral Neuroscience Division, The Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3051, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3010, Australia
| | - Andrew J. Lawrence
- Behavioral Neuroscience Division, The Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3051, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3010, Australia
| | - Jee Hyun Kim
- Behavioral Neuroscience Division, The Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3051, Australia
- The Florey Department of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC 3010, Australia
| |
Collapse
|
6
|
Niederkofler V, Asher TE, Dymecki SM. Functional Interplay between Dopaminergic and Serotonergic Neuronal Systems during Development and Adulthood. ACS Chem Neurosci 2015; 6:1055-1070. [PMID: 25747116 DOI: 10.1021/acschemneuro.5b00021] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The complex integration of neurotransmitter signals in the nervous system contributes to the shaping of behavioral and emotional constitutions throughout development. Imbalance among these signals may result in pathological behaviors and psychiatric illnesses. Therefore, a better understanding of the interplay between neurotransmitter systems holds potential to facilitate therapeutic development. Of particular clinical interest are the dopaminergic and serotonergic systems, as both modulate a broad array of behaviors and emotions and have been implicated in a wide range of affective disorders. Here we review evidence speaking to an interaction between the dopaminergic and serotonergic neuronal systems across development. We highlight data stemming from developmental, functional, and clinical studies, reflecting the importance of this transmonoaminergic interplay.
Collapse
Affiliation(s)
- Vera Niederkofler
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Tedi E. Asher
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| | - Susan M. Dymecki
- Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States
| |
Collapse
|
7
|
Trillo L, Das D, Hsieh W, Medina B, Moghadam S, Lin B, Dang V, Sanchez MM, De Miguel Z, Ashford JW, Salehi A. Ascending monoaminergic systems alterations in Alzheimer's disease. translating basic science into clinical care. Neurosci Biobehav Rev 2013; 37:1363-79. [PMID: 23707776 DOI: 10.1016/j.neubiorev.2013.05.008] [Citation(s) in RCA: 150] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Revised: 05/13/2013] [Accepted: 05/16/2013] [Indexed: 01/23/2023]
Abstract
Extensive neuropathological studies have established a compelling link between abnormalities in structure and function of subcortical monoaminergic (MA-ergic) systems and the pathophysiology of Alzheimer's disease (AD). The main cell populations of these systems including the locus coeruleus, the raphe nuclei, and the tuberomamillary nucleus undergo significant degeneration in AD, thereby depriving the hippocampal and cortical neurons from their critical modulatory influence. These studies have been complemented by genome wide association studies linking polymorphisms in key genes involved in the MA-ergic systems and particular behavioral abnormalities in AD. Importantly, several recent studies have shown that improvement of the MA-ergic systems can both restore cognitive function and reduce AD-related pathology in animal models of neurodegeneration. This review aims to explore the link between abnormalities in the MA-ergic systems and AD symptomatology as well as the therapeutic strategies targeting these systems. Furthermore, we will examine possible mechanisms behind basic vulnerability of MA-ergic neurons in AD.
Collapse
Affiliation(s)
- Ludwig Trillo
- Department of Physiology, School of Medicine, National University of San Agustin, Arequipa, Peru
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Panther P, Nullmeier S, Dobrowolny H, Schwegler H, Wolf R. CPB-K mice a mouse model of schizophrenia? Differences in dopaminergic, serotonergic and behavioral markers compared to BALB/cJ mice. Behav Brain Res 2012; 230:215-28. [PMID: 22454846 DOI: 10.1016/j.bbr.2012.02.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Schizophrenia is characterized by disturbances in social behavior, sensorimotor gating and cognitive function, that are discussed to be caused by a termination of different transmitter systems. Beside morphological alterations in cortical and subcortical areas reduced AMPA- NMDA-, 5-HT2-receptor densities and increased 5-HT1-receptor densities are found in the hippocampus.The two inbred mouse strains CPB-K and BALB/cJ are known to display considerable differences in cognitive function and prepulse inhibition, a stable marker of sensorimotor gating. Furthermore, CPB-K mice exhibit lower NMDA-, AMPA- and increased 5-HT-receptor densities in the hippocampus as compared to BALB/cJ mice. We investigated both mouse strains in social interaction test for differences in social behavior and with immuncytochemical approaches for alterations of dopaminergic and serotonergic parameters. Our results can be summarized as follows: compared to BALB/cJ, CPB-K mice showed:(1) significantly reduced traveling distance and number of contacts in social interaction test, (2) differences in the number of serotonin transporter-immunoreactive neurons and volume of raphe nuclei and a lower serotonergic fiber density in the ventral and dorsal hippocampal subfields CA1 and CA3, (3) no alterations of dopaminergic markers like neuron number, neuron density and volume in subregions of substantia nigra and ventral tegmental area, but a significantly higher dopaminergic fiber density in the dorsal hippocampus, the ventral hippocampus of CA1 and gyrus dentatus, (4) no significant differences in serotonergic and dopaminergic fiber densities in the amygdala.Based on our results and previous studies, CPB-K mice compared to BALB/cJ may serve as an important model to understand the interaction of the serotonergic and dopaminergic system and their impact on sensorimotor gating and cognitive function as related to neuropsychiatric disorders like schizophrenia.
Collapse
Affiliation(s)
- P Panther
- Institute of Anatomy, University of Magdeburg, Haus 43, Leipziger Str. 44, 39120 Magdeburg, Germany.
| | | | | | | | | |
Collapse
|
9
|
Neckameyer WS, Bhatt P. Neurotrophic actions of dopamine on the development of a serotonergic feeding circuit in Drosophila melanogaster. BMC Neurosci 2012; 13:26. [PMID: 22413901 PMCID: PMC3364880 DOI: 10.1186/1471-2202-13-26] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Accepted: 03/13/2012] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND In the fruit fly, Drosophila melanogaster, serotonin functions both as a neurotransmitter to regulate larval feeding, and in the development of the stomatogastric feeding circuit. There is an inverse relationship between neuronal serotonin levels during late embryogenesis and the complexity of the serotonergic fibers projecting from the larval brain to the foregut, which correlate with perturbations in feeding, the functional output of the circuit. Dopamine does not modulate larval feeding, and dopaminergic fibers do not innervate the larval foregut. Since dopamine can function in central nervous system development, separate from its role as a neurotransmitter, the role of neuronal dopamine was assessed on the development, and mature function, of the 5-HT larval feeding circuit. RESULTS Both decreased and increased neuronal dopamine levels in late embryogenesis during development of this circuit result in depressed levels of larval feeding. Perturbations in neuronal dopamine during this developmental period also result in greater branch complexity of the serotonergic fibers innervating the gut, as well as increased size and number of the serotonin-containing vesicles along the neurite length. This neurotrophic action for dopamine is modulated by the D2 dopamine receptor expressed during late embryogenesis in central 5-HT neurons. Animals carrying transgenic RNAi constructs to knock down both dopamine and serotonin synthesis in the central nervous system display normal feeding and fiber architecture. However, disparate levels of neuronal dopamine and serotonin during development of the circuit result in abnormal gut fiber architecture and feeding behavior. CONCLUSIONS These results suggest that dopamine can exert a direct trophic influence on the development of a specific neural circuit, and that dopamine and serotonin may interact with each other to generate the neural architecture necessary for normal function of the circuit.
Collapse
Affiliation(s)
- Wendi S Neckameyer
- Department of Pharmacological and Physiological Science, Saint Louis University School of Medicine, 1402 South Grand Boulevard, Saint Louis, Missouri 63104, USA
| | - Parag Bhatt
- Department of Pharmacological and Physiological Science, Saint Louis University School of Medicine, 1402 South Grand Boulevard, Saint Louis, Missouri 63104, USA
| |
Collapse
|
10
|
|
11
|
Zhao ZQ, Chiechio S, Sun YG, Zhang KH, Zhao CS, Scott M, Johnson RL, Deneris ES, Renner KJ, Gereau RW, Chen ZF. Mice lacking central serotonergic neurons show enhanced inflammatory pain and an impaired analgesic response to antidepressant drugs. J Neurosci 2007; 27:6045-53. [PMID: 17537976 PMCID: PMC6672267 DOI: 10.1523/jneurosci.1623-07.2007] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A large body of literature has implicated serotonin [5-hydroxytryptamine (5-HT)] in descending modulation of nociceptive transmission. Here, we have studied the pain behavior of Lmx1b conditional knock-out mice (Lmx1b(f/f/p)), which lack 5-HT neurons in the CNS. Lmx1b(f/f/p) mutant mice showed normal thermal and visceral pain responses but were less sensitive to mechanical stimuli and exhibited enhanced inflammatory pain compared with their littermate control mice. Importantly, the analgesic effect of several antidepressant drugs, including selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and tricyclic antidepressants, was either abolished or greatly attenuated in Lmx1b(f/f/p) mice. Moreover, in the acute versus persistent pain settings, the analgesic actions of the SNRI duloxetine and the SSRI fluoxetine were differentially affected. Together, our results provide in vivo genetic evidence demonstrating that although the predominant role of the central 5-HT system in inflammatory pain is inhibitory, its role in acute mechanical pain is facilitatory. The findings that the analgesic effects of various antidepressant drugs are differentially dependent on the central 5-HT system should help us to understand the mechanism of the analgesic action of different classes of antidepressants in the management of persistent pain.
Collapse
Affiliation(s)
- Zhong-Qiu Zhao
- Washington University Pain Center and
- Departments of Anesthesiology
| | - Santina Chiechio
- Washington University Pain Center and
- Departments of Anesthesiology
| | - Yan-Gang Sun
- Washington University Pain Center and
- Departments of Anesthesiology
| | - Kai-Hua Zhang
- Washington University Pain Center and
- Departments of Anesthesiology
| | - Cheng-Shui Zhao
- Washington University Pain Center and
- Departments of Anesthesiology
| | - Michael Scott
- Department of Neuroscience, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106
| | - Randy L. Johnson
- Department of Biochemistry and Molecular Biology, M. D. Anderson Cancer Center, University of Texas Health Science Center at Houston, Texas 77030, and
| | - Evan S. Deneris
- Department of Neuroscience, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106
| | - Kenneth J. Renner
- Department of Biology, The University of South Dakota, Vermillion, South Dakota 57069
| | - Robert W. Gereau
- Washington University Pain Center and
- Departments of Anesthesiology
- Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110
| | - Zhou-Feng Chen
- Washington University Pain Center and
- Departments of Anesthesiology
- Psychiatry
- Molecular Biology and Pharmacology, and
| |
Collapse
|
12
|
Cunningham MG, Connor CM, Zhang K, Benes FM. Diminished serotonergic innervation of adult medial prefrontal cortex after 6-OHDA lesions in the newborn rat. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 2005; 157:124-31. [PMID: 15885807 DOI: 10.1016/j.devbrainres.2005.02.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2004] [Revised: 02/16/2005] [Accepted: 02/21/2005] [Indexed: 11/26/2022]
Abstract
The development of the serotonergic (5HT) and dopaminergic (DA) systems may contribute to the onset of psychotic disorders during late adolescence and early adulthood. Previous studies in our laboratory have suggested that these systems may compete for functional territory on neurons during development, as lesions of the serotonergic system at postnatal day 5 (P5) result in an increase in the density of dopaminergic fibers in rat medial prefrontal cortex (mPFC). In the present study, the dopaminergic system of P5 rats was lesioned with intracisternal injections of 6-hydroxydopamine (6-OHDA). Quantification of serotonin-immunoreactivity (5HT-IR) in mPFC at adulthood (P70) revealed a significant decrease in fiber density within layers II and III of the Cg3 subdivision of mPFC in lesioned rats compared to sham controls. We propose that the decrease in serotonergic fibers in mPFC in response to a neonatal depletion of dopamine may be due to the loss of a trophic effect of this system on 5HT neurons and/or fibers during development. Taken together with previous findings, our data suggest that there may be an "inverse trophic" relationship between the cortical DA and 5HT systems whereby dopamine facilitates the ingrowth of 5HT fibers, while serotonin suppresses the ingrowth of DA fibers. We present a model based on neurotrophic interactions at the cortical and brainstem levels that could potentially explain these unexpected results.
Collapse
Affiliation(s)
- Miles Gregory Cunningham
- Laboratory for Structural and Molecular Neuroscience, McLean Hospital, 115 Mill Street, Belmont, MA 02478, USA.
| | | | | | | |
Collapse
|
13
|
Zubieta JK, Taylor SF, Huguelet P, Koeppe RA, Kilbourn MR, Frey KA. Vesicular monoamine transporter concentrations in bipolar disorder type I, schizophrenia, and healthy subjects. Biol Psychiatry 2001; 49:110-6. [PMID: 11164757 DOI: 10.1016/s0006-3223(00)00981-1] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND Previous analyses of vesicular monoamine transporter (VMAT2) binding in euthymic bipolar disorder type I (BDI) patients have shown increases of this presynaptic marker in the thalamus and ventral midbrain. To assess the diagnostic specificity of those findings, we compared VMAT2 concentrations between euthymic BDI patients, patients diagnosed with schizophrenia (SCH), and age-matched healthy volunteers. METHODS Binding sites for VMAT2 were quantified with (+)-alpha-[11C]DTBZ (dihydrotetrabenazine) and positron emission tomography. Fifteen euthymic BDI and 12 SCH patients and 15 group-matched healthy controls were studied. [11C]DTBZ tracer transport and binding potentials were examined in the thalamus and ventral midbrain with factorial analyses of variance and post hoc Tukey's honestly significantly different tests. RESULTS Analysis of variance detected diagnosis effects in binding potentials in both brain regions. Binding of VMAT2 in the thalamus was higher in BDI patients than in control subjects and SCH patients. Conversely, ventral brainstem binding was nearly identical between BDI and SCH patients and were higher than in the control group. CONCLUSIONS The patterns of regional VMAT2 expression, and by extension, the concentration of monoaminergic synaptic terminals, differ between BDI, SCH, and a control group. These findings may relate to both similarities and differences in the presentation or clinical course of these syndromes and require further examination.
Collapse
Affiliation(s)
- J K Zubieta
- The University of Michigan, Mental Health Research Institute, Neuroscience Building, 1103 E. Huron St., Ann Arbor, MI 48104-1687, USA
| | | | | | | | | | | |
Collapse
|