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Jászberényi M, Thurzó B, Bagosi Z, Vécsei L, Tanaka M. The Orexin/Hypocretin System, the Peptidergic Regulator of Vigilance, Orchestrates Adaptation to Stress. Biomedicines 2024; 12:448. [PMID: 38398050 PMCID: PMC10886661 DOI: 10.3390/biomedicines12020448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/10/2024] [Accepted: 02/15/2024] [Indexed: 02/25/2024] Open
Abstract
The orexin/hypocretin neuropeptide family has emerged as a focal point of neuroscientific research following the discovery that this family plays a crucial role in a variety of physiological and behavioral processes. These neuropeptides serve as powerful neuromodulators, intricately shaping autonomic, endocrine, and behavioral responses across species. Notably, they serve as master regulators of vigilance and stress responses; however, their roles in food intake, metabolism, and thermoregulation appear complementary and warrant further investigation. This narrative review provides a journey through the evolution of our understanding of the orexin system, from its initial discovery to the promising progress made in developing orexin derivatives. It goes beyond conventional boundaries, striving to synthesize the multifaceted activities of orexins. Special emphasis is placed on domains such as stress response, fear, anxiety, and learning, in which the authors have contributed to the literature with original publications. This paper also overviews the advancement of orexin pharmacology, which has already yielded some promising successes, particularly in the treatment of sleep disorders.
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Affiliation(s)
- Miklós Jászberényi
- Department of Pathophysiology, University of Szeged, H-6701 Szeged, Hungary; (M.J.); (B.T.); (Z.B.)
| | - Balázs Thurzó
- Department of Pathophysiology, University of Szeged, H-6701 Szeged, Hungary; (M.J.); (B.T.); (Z.B.)
- Emergency Patient Care Unit, Albert Szent-Györgyi Health Centre, University of Szeged, H-6725 Szeged, Hungary
| | - Zsolt Bagosi
- Department of Pathophysiology, University of Szeged, H-6701 Szeged, Hungary; (M.J.); (B.T.); (Z.B.)
| | - László Vécsei
- Department of Neurology, Albert Szent-Györgyi Medical School, University of Szeged, H-6725 Szeged, Hungary;
- HUN-REN-SZTE Neuroscience Research Group, Hungarian Research Network, University of Szeged (HUN-REN-SZTE), Danube Neuroscience Research Laboratory, Tisza Lajos krt. 113, H-6725 Szeged, Hungary
| | - Masaru Tanaka
- HUN-REN-SZTE Neuroscience Research Group, Hungarian Research Network, University of Szeged (HUN-REN-SZTE), Danube Neuroscience Research Laboratory, Tisza Lajos krt. 113, H-6725 Szeged, Hungary
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Impulsive prepotent actions and tics in Tourette disorder underpinned by a common neural network. Mol Psychiatry 2021; 26:3548-3557. [PMID: 32994553 PMCID: PMC8505252 DOI: 10.1038/s41380-020-00890-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 08/25/2020] [Accepted: 09/14/2020] [Indexed: 01/25/2023]
Abstract
Tourette disorder (TD), which is characterized by motor and vocal tics, is not in general considered as a product of impulsivity, despite a frequent association with attention deficit hyperactivity disorder and impulse control disorders. It is unclear which type of impulsivity, if any, is intrinsically related to TD and specifically to the severity of tics. The waiting type of motor impulsivity, defined as the difficulty to withhold a specific action, shares some common features with tics. In a large group of adult TD patients compared to healthy controls, we assessed waiting motor impulsivity using a behavioral task, as well as structural and functional underpinnings of waiting impulsivity and tics using multi-modal neuroimaging protocol. We found that unmedicated TD patients showed increased waiting impulsivity compared to controls, which was independent of comorbid conditions, but correlated with the severity of tics. Tic severity did not account directly for waiting impulsivity, but this effect was mediated by connectivity between the right orbito-frontal cortex with caudate nucleus bilaterally. Waiting impulsivity in unmedicated patients with TD also correlated with a higher gray matter signal in deep limbic structures, as well as connectivity with cortical and with cerebellar regions on a functional level. Neither behavioral performance nor structural or functional correlates were related to a psychometric measure of impulsivity or impulsive behaviors in general. Overall, the results suggest that waiting impulsivity in TD was related to tic severity, to functional connectivity of orbito-frontal cortex with caudate nucleus and to structural changes within limbic areas.
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Morales-Mulia S, Magdaleno-Madrigal VM, Nicolini H, Genis-Mendoza A, Morales-Mulia M. Orexin-A up-regulates dopamine D2 receptor and mRNA in the nucleus accumbens Shell. Mol Biol Rep 2020; 47:9689-9697. [PMID: 33170427 DOI: 10.1007/s11033-020-05979-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 11/03/2020] [Indexed: 01/11/2023]
Abstract
Orexins-A (OrxA) and -B (OrxB) neuropeptides are synthesized by a group of neurons located in the lateral hypothalamus and adjacent perifornical area, which send their projections to the mesolimbic dopaminergic (DAergic) system including ventral tegmental area and nucleus accumbens (NAc), where orexin receptors are expressed. NAc plays a central role in reward-seeking behavior and drug abuse. NAc-neurons express dopamine-1 (D1R) and dopamine-2 (D2R) receptors. Orexins bind to their two cognate G-protein-coupled receptors, orexin-receptor type-1 (Orx1R) and type-2 (Orx2R). Orexin receptor signaling is involved in behaviors such as motivation and addiction. Orexin-containing neurons modulate DAergic activity that is key in synaptic plasticity induced by addictive drugs. However, the effect of OrxA on expression and content of DAergic receptors in NAc is unknown. The purpose of this study was to investigate whether OrxA can alter gene expression and protein levels of D1R/D2R in NAc. Gene expression was evaluated by real-time PCR analysis and protein levels by western blot in rats. The results show that intracerebroventricular (i.c.v.) injection of OrxA increases both gene transcription and protein content of D2R but fails to modify D1R. This effect was also confirmed with OrxA infusion in NAc/Shell. Our results demonstrate for the first time that OrxA induces up-regulation of gene and protein of D2R in NAc. These findings support the hypothesis that OrxA modulates the DAergic transmission and this may serve to understand how orexin signaling enhances DA responses at baseline conditions and in response to psychostimulants.
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Affiliation(s)
- Sandra Morales-Mulia
- Departamento de Biología Celular, Facultad de Ciencias, UNAM, Mexico, DF, Mexico
| | | | - Humberto Nicolini
- Laboratory of Genomics of Psychiatric Diseases, Neurodegenerative and Addictions, National Institute of Genomic Medicine, Mexico, Mexico
| | - Alma Genis-Mendoza
- Laboratory of Genomics of Psychiatric Diseases, Neurodegenerative and Addictions, National Institute of Genomic Medicine, Mexico, Mexico.,Hospital Psiquiátrico Infantil "Dr. Juan N. Navarro" Psychiatric Attention Services, Mexico, Mexico
| | - Marcela Morales-Mulia
- Bases Moleculares de las Adicciones, Subdirección de Investigaciones Clínicas, INPRFM, Calzada México-Xochimilco 101, San Lorenzo Huipulco, Tlalpan, 14370, Mexico, DF, Mexico.
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Fritz EM, Singewald N, De Bundel D. The Good, the Bad and the Unknown Aspects of Ghrelin in Stress Coping and Stress-Related Psychiatric Disorders. Front Synaptic Neurosci 2020; 12:594484. [PMID: 33192444 PMCID: PMC7652849 DOI: 10.3389/fnsyn.2020.594484] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 09/14/2020] [Indexed: 12/16/2022] Open
Abstract
Ghrelin is a peptide hormone released by specialized X/A cells in the stomach and activated by acylation. Following its secretion, it binds to ghrelin receptors in the periphery to regulate energy balance, but it also acts on the central nervous system where it induces a potent orexigenic effect. Several types of stressors have been shown to stimulate ghrelin release in rodents, including nutritional stressors like food deprivation, but also physical and psychological stressors such as foot shocks, social defeat, forced immobilization or chronic unpredictable mild stress. The mechanism through which these stressors drive ghrelin release from the stomach lining remains unknown and, to date, the resulting consequences of ghrelin release for stress coping remain poorly understood. Indeed, ghrelin has been proposed to act as a stress hormone that reduces fear, anxiety- and depression-like behaviors in rodents but some studies suggest that ghrelin may - in contrast - promote such behaviors. In this review, we aim to provide a comprehensive overview of the literature on the role of the ghrelin system in stress coping. We discuss whether ghrelin release is more than a byproduct of disrupted energy homeostasis following stress exposure. Furthermore, we explore the notion that ghrelin receptor signaling in the brain may have effects independent of circulating ghrelin and in what way this might influence stress coping in rodents. Finally, we examine how the ghrelin system could be utilized as a therapeutic avenue in stress-related psychiatric disorders (with a focus on anxiety- and trauma-related disorders), for example to develop novel biomarkers for a better diagnosis or new interventions to tackle relapse or treatment resistance in patients.
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Affiliation(s)
- Eva Maria Fritz
- Department of Pharmacology and Toxicology, Institute of Pharmacy and CMBI, University of Innsbruck, Innsbruck, Austria
| | - Nicolas Singewald
- Department of Pharmacology and Toxicology, Institute of Pharmacy and CMBI, University of Innsbruck, Innsbruck, Austria
| | - Dimitri De Bundel
- Department of Pharmaceutical Sciences, Research Group Experimental Pharmacology, Center for Neurosciences (C4N), Vrije Universiteit Brussel, Brussels, Belgium
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5
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Carr KD. Modulatory Effects of Food Restriction on Brain and Behavioral Effects of Abused Drugs. Curr Pharm Des 2020; 26:2363-2371. [DOI: 10.2174/1381612826666200204141057] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 11/19/2019] [Indexed: 12/14/2022]
Abstract
Energy homeostasis is achieved, in part, by metabolic signals that regulate the incentive motivating
effects of food and its cues, thereby driving or curtailing procurement and consumption. The neural underpinnings
of these regulated incentive effects have been identified as elements within the mesolimbic dopamine pathway.
A separate line of research has shown that most drugs with abuse liability increase dopamine transmission in
this same pathway and thereby reinforce self-administration. Consequently, one might expect shifts in energy
balance and metabolic signaling to impact drug abuse risk. Basic science studies have yielded numerous examples
of drug responses altered by diet manipulation. Considering the prevalence of weight loss dieting in Western
societies, and the anorexigenic effects of many abused drugs themselves, we have focused on the CNS and behavioral
effects of food restriction in rats. Food restriction has been shown to increase the reward magnitude of diverse
drugs of abuse, and these effects have been attributed to neuroadaptations in the dopamine-innervated nucleus
accumbens. The changes induced by food restriction include synaptic incorporation of calcium-permeable
AMPA receptors and increased signaling downstream of D1 dopamine receptor stimulation. Recent studies suggest
a mechanistic model in which concurrent stimulation of D1 and GluA2-lacking AMPA receptors enables
increased stimulus-induced trafficking of GluA1/GluA2 AMPARs into the postsynaptic density, thereby increasing
the incentive effects of food, drugs, and associated cues. In addition, the established role of AMPA receptor
trafficking in enduring synaptic plasticity prompts speculation that drug use during food restriction may more
strongly ingrain behavior relative to similar use under free-feeding conditions.
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Affiliation(s)
- Kenneth D. Carr
- Departments of Psychiatry, Biochemistry and Molecular Pharmacology, New York University School of Medicine, 435 East 30th Street, New York, NY 10016, United States
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Carr KD. Homeostatic regulation of reward via synaptic insertion of calcium-permeable AMPA receptors in nucleus accumbens. Physiol Behav 2020; 219:112850. [PMID: 32092445 PMCID: PMC7108974 DOI: 10.1016/j.physbeh.2020.112850] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 01/23/2020] [Accepted: 02/18/2020] [Indexed: 10/25/2022]
Abstract
The incentive effects of food and related cues are determined by stimulus properties and the internal state of the organism. Enhanced hedonic reactivity and incentive motivation in energy deficient subjects have been demonstrated in animal models and humans. Defining the neurobiological underpinnings of these state-based modulatory effects could illuminate fundamental mechanisms of adaptive behavior, as well as provide insight into maladaptive consequences of weight loss dieting and the relationship between disturbed eating behavior and substance abuse. This article summarizes research of our laboratory aimed at identifying neuroadaptations induced by chronic food restriction (FR) that increase the reward magnitude of drugs and associated cues. The main findings are that FR decreases basal dopamine (DA) transmission, upregulates signaling downstream of the D1 DA receptor (D1R), and triggers synaptic incorporation of calcium-permeable AMPA receptors (CP-AMPARs) in the nucleus accumbens (NAc). Selective antagonism of CP-AMPARs decreases excitatory postsynaptic currents in NAc medium spiny neurons of FR rats and blocks the enhanced rewarding effects of d-amphetamine and a D1R, but not a D2R, agonist. These results suggest that FR drives CP-AMPARs into the synaptic membrane of D1R-expressing MSNs, possibly as a homeostatic response to reward loss. FR subjects also display diminished aversion for contexts associated with LiCl treatment and centrally infused cocaine. An encompassing, though speculative, hypothesis is that NAc synaptic incorporation of CP-AMPARs in response to food scarcity and other forms of sustained reward loss adaptively increases incentive effects of reward stimuli and, at the same time, diminishes responsiveness to aversive stimuli that have potential to interfere with goal pursuit.
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Affiliation(s)
- Kenneth D Carr
- Departments of Psychiatry and Biochemistry and Molecular Pharmacology, New York University School of Medicine, 435 East 30th Street, New York, NY 10016, United States.
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Flanigan ME, Aleyasin H, Li L, Burnett CJ, Chan KL, LeClair KB, Lucas EK, Matikainen-Ankney B, Durand-de Cuttoli R, Takahashi A, Menard C, Pfau ML, Golden SA, Bouchard S, Calipari ES, Nestler EJ, DiLeone RJ, Yamanaka A, Huntley GW, Clem RL, Russo SJ. Orexin signaling in GABAergic lateral habenula neurons modulates aggressive behavior in male mice. Nat Neurosci 2020; 23:638-650. [PMID: 32284606 PMCID: PMC7195257 DOI: 10.1038/s41593-020-0617-7] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 03/02/2020] [Indexed: 11/30/2022]
Abstract
Heightened aggression is characteristic of multiple neuropsychiatric disorders and can have various negative effects on patients, their families and the public. Recent studies in humans and animals have implicated brain reward circuits in aggression and suggest that, in subsets of aggressive individuals, domination of subordinate social targets is reinforcing. In this study, we showed that, in male mice, orexin neurons in the lateral hypothalamus activated a small population of glutamic acid decarboxylase 2 (GAD2)-expressing neurons in the lateral habenula (LHb) via orexin receptor 2 (OxR2) and that activation of these GAD2 neurons promoted male-male aggression and conditioned place preference for aggression-paired contexts. Moreover, LHb GAD2 neurons were inhibitory within the LHb and dampened the activity of the LHb as a whole. These results suggest that the orexin system is important for the regulation of inter-male aggressive behavior and provide the first functional evidence of a local inhibitory circuit within the LHb.
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Affiliation(s)
- Meghan E Flanigan
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Hossein Aleyasin
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Long Li
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - C Joseph Burnett
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kenny L Chan
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Katherine B LeClair
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Elizabeth K Lucas
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC, USA
| | - Bridget Matikainen-Ankney
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Romain Durand-de Cuttoli
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Aki Takahashi
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Laboratory of Behavioral Neuroendocrinology, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Caroline Menard
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Psychiatry and Neuroscience, Faculty of Medicine and CERVO Brain Research Center, Université Laval, Ville de Québec, QC, Canada
| | - Madeline L Pfau
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Sam A Golden
- Department of Biological Structure, University of Washington, Seattle, WA, USA
| | - Sylvain Bouchard
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Erin S Calipari
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Eric J Nestler
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Ralph J DiLeone
- Department of Psychiatry, Yale University, New Haven, CT, USA
| | - Akihiro Yamanaka
- Department of Neuroscience II, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan
| | - George W Huntley
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Roger L Clem
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Scott J Russo
- Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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Pierre A, Van Schuerbeek A, Allaoui W, Van Laere S, Singewald N, Van Eeckhaut A, Smolders I, De Bundel D. Effects of ghrelin receptor activation on forebrain dopamine release, conditioned fear and fear extinction in C57BL/6J mice. J Neurochem 2020; 154:389-403. [DOI: 10.1111/jnc.14996] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 02/25/2020] [Accepted: 02/26/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Anouk Pierre
- Department of Pharmaceutical Sciences Research Group Experimental Pharmacology Center for Neurosciences (C4N) Vrije Universiteit Brussel Brussels Belgium
| | - Andries Van Schuerbeek
- Department of Pharmaceutical Sciences Research Group Experimental Pharmacology Center for Neurosciences (C4N) Vrije Universiteit Brussel Brussels Belgium
| | - Wissal Allaoui
- Department of Pharmaceutical Sciences Research Group Experimental Pharmacology Center for Neurosciences (C4N) Vrije Universiteit Brussel Brussels Belgium
| | - Sven Van Laere
- Interfaculty Center Data Processing & Statistics Vrije Universiteit Brussel Brussels Belgium
| | - Nicolas Singewald
- Department of Pharmacology and Toxicology Institute of Pharmacy and CMBI University of Innsbruck Innsbruck Austria
| | - Ann Van Eeckhaut
- Department of Pharmaceutical Sciences Research Group Experimental Pharmacology Center for Neurosciences (C4N) Vrije Universiteit Brussel Brussels Belgium
| | - Ilse Smolders
- Department of Pharmaceutical Sciences Research Group Experimental Pharmacology Center for Neurosciences (C4N) Vrije Universiteit Brussel Brussels Belgium
| | - Dimitri De Bundel
- Department of Pharmaceutical Sciences Research Group Experimental Pharmacology Center for Neurosciences (C4N) Vrije Universiteit Brussel Brussels Belgium
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Levo-tetrahydropalmatine attenuates methamphetamine reward behavior and the accompanying activation of ERK phosphorylation in mice. Neurosci Lett 2020; 714:134416. [DOI: 10.1016/j.neulet.2019.134416] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 07/20/2019] [Accepted: 08/05/2019] [Indexed: 01/23/2023]
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10
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Alger SJ, Kelm-Nelson CA, Stevenson SA, Juang C, Gammie SC, Riters LV. Complex patterns of dopamine-related gene expression in the ventral tegmental area of male zebra finches relate to dyadic interactions with long-term female partners. GENES BRAIN AND BEHAVIOR 2019; 19:e12619. [PMID: 31634415 DOI: 10.1111/gbb.12619] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 09/27/2019] [Accepted: 10/14/2019] [Indexed: 12/14/2022]
Abstract
Dopaminergic projections from the ventral tegmental area (VTA) to multiple efferent targets are implicated in pair bonding, yet the role of the VTA in the maintenance of long-term pair bonds is not well characterized. Complex interactions between numerous neuromodulators modify activity in the VTA, suggesting that individual differences in patterns of gene expression in this region may explain individual differences in long-term social interactions in bonded pairs. To test this hypothesis we used RNA-seq to measure expression of over 8000 annotated genes in male zebra finches in established male-female pairs. Weighted gene co-expression network analysis identified a gene module that contained numerous dopamine-related genes with TH found to be the most connected gene of the module. Genes in this module related to male agonistic behaviors as well as bonding-related behaviors produced by female partners. Unsupervised learning approaches identified two groups of males that differed with respect to expression of numerous genes. Enrichment analyses showed that many dopamine-related genes and modulators differed between these groups, including dopamine receptors, synthetic and degradative enzymes, the avian dopamine transporter and several GABA- and glutamate-related genes. Many of the bonding-related behaviors closely associated with VTA gene expression in the two male groups were produced by the male's partner, rather than the male himself. Collectively, results highlight numerous candidate genes in the VTA that can be explored in future studies and raise the possibility that the molecular/genetic organization of the VTA may be strongly shaped by a social partner and/or the strength of the pair bond.
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Affiliation(s)
- Sarah J Alger
- Department of Biology, University of Wisconsin-Stevens Point, Stevens Point, Wisconsin
| | - Cynthia A Kelm-Nelson
- Department of Surgery, Division of Otolaryngology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Sharon A Stevenson
- Department of Surgery, Division of Otolaryngology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Charity Juang
- Department of Integrative Biology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Stephen C Gammie
- Department of Integrative Biology, University of Wisconsin-Madison, Madison, Wisconsin
| | - Lauren V Riters
- Department of Integrative Biology, University of Wisconsin-Madison, Madison, Wisconsin
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11
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Soares PN, Miranda RA, Peixoto TC, Caramez FAH, Guarda DS, Manhães AC, de Oliveira E, de Moura EG, Lisboa PC. Cigarette smoke during lactation in rat female progeny: Late effects on endocannabinoid and dopaminergic systems. Life Sci 2019; 232:116575. [PMID: 31211999 DOI: 10.1016/j.lfs.2019.116575] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/11/2019] [Accepted: 06/14/2019] [Indexed: 01/07/2023]
Abstract
AIMS Maternal smoking is considered a risk factor for childhood obesity. In a rat model of tobacco exposure during breastfeeding, we previously reported hyperphagia, overweight, increased visceral fat and hyperleptinemia in adult female offspring. Obesity and eating disorders are associated with impairment in the endocannabinoid (EC) and dopaminergic (DA) systems. Considering that women are prone to eating disorders, we hypothesize that adult female Wistar rats that were exposed to cigarette smoke (CS) during the suckling period would develop EC and DA systems deregulation, possibly explaining the eating disorder in this model. MATERIAL AND METHODS To mimic maternal smoking, from postnatal day 3 to 21, dams and offspring were exposed to a smoking machine, 4×/day/1 h (CS group). Control animals were exposed to ambient air. Offspring were evaluated at 26 weeks of age. KEY FINDINGS Concerning the EC system, the CS group had increased expression of diacylglycerol lipase (DAGL) in the lateral hypothalamus (LH) and decreased in the liver. In the visceral adipose tissue, the EC receptor (CB1r) was decreased. Regarding the DA system, the CS group showed higher dopamine transporter (DAT) protein expression in the prefrontal cortex (PFC) and lower DA receptor (D2r) in the arcuate nucleus (ARC). We also assessed the hypothalamic leptin signaling, which was shown to be unchanged. CS offspring showed decreased plasma 17β-estradiol. SIGNIFICANCE Neonatal CS exposure induces changes in some biomarkers of the EC and DA systems, which can partially explain the hyperphagia observed in female rats.
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Affiliation(s)
- P N Soares
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - R A Miranda
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - T C Peixoto
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - F A H Caramez
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - D S Guarda
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - A C Manhães
- Neurophysiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - E de Oliveira
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - E G de Moura
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil
| | - P C Lisboa
- Endocrine Physiology Laboratory, Department of Physiological Sciences, State University of Rio de Janeiro, 20550-030 Rio de Janeiro, RJ, Brazil.
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12
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α-Conotoxin TxIB: A Uniquely Selective Ligand for α6/α3β2β3 Nicotinic Acetylcholine Receptor Attenuates Nicotine-Induced Conditioned Place Preference in Mice. Mar Drugs 2019; 17:md17090490. [PMID: 31443523 PMCID: PMC6780885 DOI: 10.3390/md17090490] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Revised: 08/17/2019] [Accepted: 08/20/2019] [Indexed: 11/17/2022] Open
Abstract
α-Conotoxin TxIB is a specific antagonist of α6/α3β2β3(α6β2*) nicotinic acetylcholine receptor (nAChR) with an IC50 of 28 nM. Previous studies have shown that α6β2* nAChRs are abundantly expressed in midbrain dopaminergic neurons and play an important role in mediating the mechanism of nicotine and other drugs reward effect. It provided important targets for the development of anti-addiction drugs. The present study evaluated the pharmacological activity of TxIB in vivo with conditioned place preference (CPP) model, which were induced by subcutaneous injection (s.c.) of nicotine (NIC, 0.5 mg/kg). α-Conotoxin TxIB inhibited the expression and reinstatement of CPP in mice dose-dependently, but had no significant effect on locomotor activity. The concentrations of dopamine (DA), γ-aminobutyric acid (GABA) and noradrenaline (NE) in different brain regions were measured by enzyme-linked immunosorbent assay (ELISA). We found that TxIB could inhibit the concentrations of DA, GABA and NE in different brain regions (such as nucleus accumbens (NAc), hippocampus (HIP) and prefrontal cortex (PFC)) in NIC-induced mice. The concentrations of DA and NE were decreased in ventral tegmental area (VTA), while GABA had little change. The current work described the inhibition activity of TxIB in NIC-induced CPP, suggesting that α6β2* nAChR-targeted compound may be a promising drug for nicotine addiction treatment.
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13
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Differential gene expression in the mesocorticolimbic system of innately high- and low-impulsive rats. Behav Brain Res 2019; 364:193-204. [DOI: 10.1016/j.bbr.2019.01.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 12/12/2018] [Accepted: 01/12/2019] [Indexed: 02/02/2023]
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14
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Gumbs MCR, Vuuregge AH, Eggels L, Unmehopa UA, Lamuadni K, Mul JD, la Fleur SE. Afferent neuropeptide Y projections to the ventral tegmental area in normal-weight male Wistar rats. J Comp Neurol 2019; 527:2659-2674. [PMID: 30950054 PMCID: PMC6767444 DOI: 10.1002/cne.24698] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 04/01/2019] [Indexed: 12/12/2022]
Abstract
The hypothalamic neuropeptide Y (NPY) circuitry is a key regulator of feeding behavior. NPY also acts in the mesolimbic dopaminergic circuitry, where it can increase motivational aspects of feeding behavior through effects on dopamine output in the nucleus accumbens (NAc) and on neurotransmission in the ventral tegmental area (VTA). Endogenous NPY in the NAc originates from local interneurons and afferent projections from the hypothalamic arcuate nucleus (Arc). However, the origin of endogenous NPY in the VTA is unknown. We determined, in normal‐weight male Wistar rats, if the source of VTA NPY is local, and/or whether it is derived from VTA‐projecting neurons. Immunocytochemistry, in situ hybridization and RT‐qPCR were utilized, when appropriate in combination with colchicine treatment or 24 hr fasting, to assess NPY/Npy expression locally in the VTA. Retrograde tracing using cholera toxin beta (CTB) in the VTA, fluorescent immunocytochemistry and confocal microscopy were used to determine NPY‐immunoreactive afferents to the VTA. NPY in the VTA was observed in fibers, but not following colchicine pretreatment. No NPY‐ or Npy‐expressing cell bodies were observed in the VTA. Fasting for 24 hr, which increased Npy expression in the Arc, failed to induce Npy expression in the VTA. Double‐labeling with CTB and NPY was observed in the Arc and in the ventrolateral medulla. Thus, VTA NPY originates from the hypothalamic Arc and the ventrolateral medulla of the brainstem in normal‐weight male Wistar rats. These afferent connections link hypothalamic and brainstem processing of physiologic state to VTA‐driven motivational behavior.
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Affiliation(s)
- Myrtille C R Gumbs
- Department of Endocrinology and Metabolism & Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,Metabolism and Reward Group, Netherlands Institute for Neuroscience, an Institute of the Royal Netherlands Academy of Arts and Sciences, Amsterdam, The Netherlands
| | - Anna H Vuuregge
- Department of Endocrinology and Metabolism & Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Leslie Eggels
- Department of Endocrinology and Metabolism & Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,Metabolism and Reward Group, Netherlands Institute for Neuroscience, an Institute of the Royal Netherlands Academy of Arts and Sciences, Amsterdam, The Netherlands
| | - Unga A Unmehopa
- Department of Endocrinology and Metabolism & Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Khalid Lamuadni
- Department of Endocrinology and Metabolism & Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Joram D Mul
- Department of Endocrinology and Metabolism & Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,Metabolism and Reward Group, Netherlands Institute for Neuroscience, an Institute of the Royal Netherlands Academy of Arts and Sciences, Amsterdam, The Netherlands
| | - Susanne E la Fleur
- Department of Endocrinology and Metabolism & Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.,Metabolism and Reward Group, Netherlands Institute for Neuroscience, an Institute of the Royal Netherlands Academy of Arts and Sciences, Amsterdam, The Netherlands
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15
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Baykal S, Albayrak Y, Durankuş F, Güzel S, Abbak Ö, Potas N, Beyazyüz M, Karabekiroğlu K, Donma MM. Decreased serum orexin A levels in drug-naive children with attention deficit and hyperactivity disorder. Neurol Sci 2019; 40:593-602. [PMID: 30617449 DOI: 10.1007/s10072-018-3692-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 12/19/2018] [Indexed: 11/25/2022]
Affiliation(s)
- Saliha Baykal
- Faculty of Medicine, Department of Child and Adolescent Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey.
| | - Yakup Albayrak
- Faculty of Medicine, Department of Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Ferit Durankuş
- Faculty of Medicine, Department of Pediatrics, Okan University, Istanbul, Turkey
| | - Savaş Güzel
- Faculty of Medicine, Department of Biochemistry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Özlem Abbak
- Faculty of Medicine, Department of Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Nihan Potas
- Faculty of Economics and Administrative Science, Department of Healthcare Management, Gazi University, Ankara, Turkey
| | - Murat Beyazyüz
- Faculty of Medicine, Department of Psychiatry, Tekirdağ Namık Kemal University, Tekirdag, Turkey
| | - Koray Karabekiroğlu
- Faculty of Medicine, Department of Child and Adolescent Psychiatry, Ondokuz Mayıs University, Samsun, Turkey
| | - Mustafa Metin Donma
- Faculty of Medicine, Department of Pediatrics, Tekirdağ Namık Kemal University, Tekirdag, Turkey
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16
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Yan F, Wang W, Cheng H. Bacillus subtilis based probiotic improved bone mass and altered brain serotoninergic and dopaminergic systems in broiler chickens. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.09.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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17
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Lai F, Cucca F, Frau R, Corrias F, Schlich M, Caboni P, Fadda AM, Bassareo V. Systemic Administration of Orexin a Loaded Liposomes Potentiates Nucleus Accumbens Shell Dopamine Release by Sucrose Feeding. Front Psychiatry 2018; 9:640. [PMID: 30559683 PMCID: PMC6287025 DOI: 10.3389/fpsyt.2018.00640] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 11/12/2018] [Indexed: 12/16/2022] Open
Abstract
Orexin neurons originate in the lateral and dorsomedial hypothalamus and perifornical area and produce two different neuropeptides: orexin A (OxA) and orexin B (OxB), which activate OxR1 and OxR2 receptors. In the lateral hypothalamus (LH) orexin neurons are involved in behavior motivated by natural rewards such as palatable food (sugar, high-fat food) and it has been demonstrated similarly that the orexin signaling in the ventral tegmental area (VTA) is implicated in the intake of high-fat food. The VTA is an important area involved in reward processing. Given the involvement of nucleus accumbens (NAc) shell dopamine (DA) in motivation for food, we intended to investigate the effect of OxA on the basal and feeding-activated DA transmission in the NAc shell. OxA is a large peptide and does not cross the blood-brain barrier and for this reason was loaded on two kinds of liposomes: anti-transferrin-monoclonal antibodies (OX26-mAb) and lactoferrin-modified stealth liposomes. The effect of IV administration of both OxA liposomes on NAc shell DA was studied by microdialysis in freely moving rats. OxA, administered using both kinds of liposomes, produced a delayed and transitory increase in dialysate DA in the NAc shell, strongly and lastingly potentiated the increase in dialysate DA elicited by sucrose pellet consumption and increased the number of eaten pellets. These effects of OxA on DA transmission and feeding were prevented by the OxR1 antagonist SB 334867. Hence, OxA acting on VTA OxR1 can facilitate sucrose-stimulated NAc shell DA transmission directly by increasing the basal activity of VTA DA neurons that send their projections to the NAc shell.
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Affiliation(s)
- Francesco Lai
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy.,CNBS, University of Cagliari, Cagliari, Italy
| | - Flavia Cucca
- Department of Biomedical Sciences, University of Cagliari, Monserrato, Italy
| | - Roberto Frau
- Department of Biomedical Sciences, University of Cagliari, Monserrato, Italy
| | - Francesco Corrias
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Michele Schlich
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Pierluigi Caboni
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Anna Maria Fadda
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy.,CNBS, University of Cagliari, Cagliari, Italy
| | - Valentina Bassareo
- Department of Biomedical Sciences, University of Cagliari, Monserrato, Italy.,Cagliari Section, National Institute of Neuroscience, Monserrato, Italy
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18
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Scaplen KM, Kaun KR. Reward from bugs to bipeds: a comparative approach to understanding how reward circuits function. J Neurogenet 2017; 30:133-48. [PMID: 27328845 PMCID: PMC4926782 DOI: 10.1080/01677063.2016.1180385] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In a complex environment, animals learn from their responses to stimuli and events. Appropriate response to reward and punishment can promote survival, reproduction and increase evolutionary fitness. Interestingly, the neural processes underlying these responses are remarkably similar across phyla. In all species, dopamine is central to encoding reward and directing motivated behaviors, however, a comprehensive understanding of how circuits encode reward and direct motivated behaviors is still lacking. In part, this is a result of the sheer diversity of neurons, the heterogeneity of their responses and the complexity of neural circuits within which they are found. We argue that general features of reward circuitry are common across model organisms, and thus principles learned from invertebrate model organisms can inform research across species. In particular, we discuss circuit motifs that appear to be functionally equivalent from flies to primates. We argue that a comparative approach to studying and understanding reward circuit function provides a more comprehensive understanding of reward circuitry, and informs disorders that affect the brain’s reward circuitry.
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Affiliation(s)
- Kristin M Scaplen
- a Department of Neuroscience , Brown University , Providence , RI , USA
| | - Karla R Kaun
- a Department of Neuroscience , Brown University , Providence , RI , USA
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19
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Du Y, Du L, Cao J, Hölscher C, Feng Y, Su H, Wang Y, Yun KM. Levo-tetrahydropalmatine inhibits the acquisition of ketamine-induced conditioned place preference by regulating the expression of ERK and CREB phosphorylation in rats. Behav Brain Res 2017; 317:367-373. [DOI: 10.1016/j.bbr.2016.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 09/28/2016] [Accepted: 10/01/2016] [Indexed: 12/31/2022]
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20
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Gumbs MC, van den Heuvel JK, la Fleur SE. The effect of obesogenic diets on brain Neuropeptide Y. Physiol Behav 2016; 162:161-73. [DOI: 10.1016/j.physbeh.2016.04.049] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 03/18/2016] [Accepted: 04/26/2016] [Indexed: 12/18/2022]
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21
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Fattore L, Diana M. Drug addiction: An affective-cognitive disorder in need of a cure. Neurosci Biobehav Rev 2016; 65:341-61. [DOI: 10.1016/j.neubiorev.2016.04.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 03/24/2016] [Accepted: 04/11/2016] [Indexed: 12/22/2022]
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22
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Gong X, Yue K, Ma B, Xing J, Gan Y, Wang D, Jin G, Li C. Levo-tetrahydropalmatine, a natural, mixed dopamine receptor antagonist, inhibits methamphetamine self-administration and methamphetamine-induced reinstatement. Pharmacol Biochem Behav 2016; 144:67-72. [DOI: 10.1016/j.pbb.2016.01.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 12/22/2015] [Accepted: 01/20/2016] [Indexed: 11/28/2022]
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23
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The Influence of Palatable Diets in Reward System Activation: A Mini Review. Adv Pharmacol Sci 2016; 2016:7238679. [PMID: 27087806 PMCID: PMC4818794 DOI: 10.1155/2016/7238679] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 02/12/2016] [Accepted: 02/16/2016] [Indexed: 11/29/2022] Open
Abstract
The changes in eating patterns that have occurred in recent decades are an important cause of obesity. Food intake and energy expenditure are controlled by a complex neural system involving the hypothalamic centers and peripheral satiety system (gastrointestinal and pancreatic hormones). Highly palatable and caloric food disrupts appetite regulation; however, palatable foods induce pleasure and reward. The cafeteria diet is such a palatable diet and has been shown consistently to increase body weight and induce hyperplasia in animal obesity models. Moreover, palatable high-fat foods (such as those of the cafeteria diet) can induce addiction-like deficits in brain reward function and are considered to be an important source of motivation that might drive overeating and contribute to the development of obesity. The mechanism of neural adaptation triggered by palatable foods is similar to those that have been reported for nondrug addictions and long-term drug use. Thus, this review attempts to describe the potential mechanisms that might lead to highly palatable diets, such as the cafeteria diet, triggering addiction, or compulsion through the reward system.
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Abstract
The hypocretins (Hcrts), also known as orexins, have been among the most intensely studied neuropeptide systems since their discovery about two decades ago. Anatomical evidence shows that the hypothalamic neurons that produce hypocretins/orexins project widely throughout the entire brain, innervating the noradrenergic locus coeruleus, the cholinergic basal forebrain, the dopaminergic ventral tegmental area, the serotonergic raphe nuclei, the histaminergic tuberomammillary nucleus, and many other brain regions. By interacting with other neural systems, the Hcrt system profoundly modulates versatile physiological processes including arousal, food intake, emotion, attention, and reward. Importantly, interruption of the interactions between these systems has the potential to cause neurological and psychiatric diseases. Here, we review the modulation of diverse neural systems by Hcrts and summarize potential therapeutic strategies based on our understanding of the Hcrt system's role in physiology and pathophysiological processes.
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25
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A refined high carbohydrate diet is associated with changes in the serotonin pathway and visceral obesity. Genet Res (Camb) 2015; 97:e23. [PMID: 26707058 DOI: 10.1017/s0016672315000233] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Consumption of palatable foods high in refined carbohydrate has been implicated as a contributing factor to the epidemic levels of obesity. Such foods may disrupt appetite regulation in the hypothalamus through alterations in hunger and satiety signalling. This investigation examined whether a palatable high refined carbohydrate (HRC) diet with the potential to induce obesity was linked to modulation of serotonin and dopamine signalling within the hypothalamus of rats. Male Wistar rats were allowed ad libitum access to either a palatable refined carbohydrate enriched (HRC) diet or standard chow (SC). Visceral fat percentage was used as a measure of the animals' weight gain during the trial. Real-time PCR was applied to determine any variation in levels of expression of the serotonin (Slc6A4 or Sert) and dopamine transporter (Slc6A3 or Dat) genes. After 29 weeks, the HRC group showed a significant increase in visceral fat percentage accompanied by increased expression of Sert. Higher levels of circulating triglycerides were also seen. This investigation determined that a refined high carbohydrate diet is associated with visceral obesity, increased circulating lipids in the blood and distorted serotonergic signalling, which possibly alters satiety and hunger signals.
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26
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Slater PG, Noches V, Gysling K. Corticotropin-releasing factor type-2 receptor and corticotropin-releasing factor-binding protein coexist in rat ventral tegmental area nerve terminals originated in the lateral hypothalamic area. Eur J Neurosci 2015; 43:220-9. [DOI: 10.1111/ejn.13113] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 09/24/2015] [Accepted: 10/19/2015] [Indexed: 12/31/2022]
Affiliation(s)
- Paula G. Slater
- Department of Cellular and Molecular Biology; Millenium Science Nucleus in Stress and Addiction; Faculty of Biological Sciences; Pontificia Universidad Católica de Chile; Alameda 340 Santiago 8331150 Chile
| | - Veronica Noches
- Department of Cellular and Molecular Biology; Millenium Science Nucleus in Stress and Addiction; Faculty of Biological Sciences; Pontificia Universidad Católica de Chile; Alameda 340 Santiago 8331150 Chile
| | - Katia Gysling
- Department of Cellular and Molecular Biology; Millenium Science Nucleus in Stress and Addiction; Faculty of Biological Sciences; Pontificia Universidad Católica de Chile; Alameda 340 Santiago 8331150 Chile
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27
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Reichelt AC, Westbrook RF, Morris MJ. Integration of reward signalling and appetite regulating peptide systems in the control of food-cue responses. Br J Pharmacol 2015; 172:5225-38. [PMID: 26403657 DOI: 10.1111/bph.13321] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 07/28/2015] [Accepted: 08/27/2015] [Indexed: 12/24/2022] Open
Abstract
Understanding the neurobiological substrates that encode learning about food-associated cues and how those signals are modulated is of great clinical importance especially in light of the worldwide obesity problem. Inappropriate or maladaptive responses to food-associated cues can promote over-consumption, leading to excessive energy intake and weight gain. Chronic exposure to foods rich in fat and sugar alters the reinforcing value of foods and weakens inhibitory neural control, triggering learned, but maladaptive, associations between environmental cues and food rewards. Thus, responses to food-associated cues can promote cravings and food-seeking by activating mesocorticolimbic dopamine neurocircuitry, and exert physiological effects including salivation. These responses may be analogous to the cravings experienced by abstaining drug addicts that can trigger relapse into drug self-administration. Preventing cue-triggered eating may therefore reduce the over-consumption seen in obesity and binge-eating disorder. In this review we discuss recent research examining how cues associated with palatable foods can promote reward-based feeding behaviours and the potential involvement of appetite-regulating peptides including leptin, ghrelin, orexin and melanin concentrating hormone. These peptide signals interface with mesolimbic dopaminergic regions including the ventral tegmental area to modulate reactivity to cues associated with palatable foods. Thus, a novel target for anti-obesity therapeutics is to reduce non-homeostatic, reward driven eating behaviour, which can be triggered by environmental cues associated with highly palatable, fat and sugar rich foods.
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Affiliation(s)
- A C Reichelt
- School of Psychology, UNSW Sydney, Sydney, UNSW, Australia.,School of Medical Sciences, UNSW Sydney, Sydney, UNSW, Australia
| | - R F Westbrook
- School of Psychology, UNSW Sydney, Sydney, UNSW, Australia
| | - M J Morris
- School of Medical Sciences, UNSW Sydney, Sydney, UNSW, Australia
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28
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Yamada C, Saegusa Y, Nahata M, Sadakane C, Hattori T, Takeda H. Influence of Aging and Gender Differences on Feeding Behavior and Ghrelin-Related Factors during Social Isolation in Mice. PLoS One 2015; 10:e0140094. [PMID: 26448274 PMCID: PMC4598162 DOI: 10.1371/journal.pone.0140094] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 09/22/2015] [Indexed: 11/29/2022] Open
Abstract
Psychological stress due to social isolation is known to cause abnormal feeding behaviors, but the influences of gender and aging on subchronic stress-induced changes in feeding behaviors are unknown. Thus, we examined the changes in body weight, food intake, and orexigenic ghrelin-related factors during 2 weeks of isolation stress in young and aged mice. Food intake increased significantly in young mice in the isolation group compared with the group-housed control throughout the experimental period. This isolation-induced increase in food intake was not observed in aged mice. In young mice, there were no significant differences in body weight between the isolated group and group-housed control up to 2 weeks. However, aged male mice exhibited significant weight loss at 2 weeks and a similar tendency was observed in aged female mice. Young male mice, but not female mice, had significantly increased (2.2-fold) plasma acylated ghrelin levels after 1 week of isolation compared with the group-housed control. A significant but lower increase (1.3-fold) was also observed in aged male mice. Hypothalamic preproghrelin gene expression decreased significantly with isolation in young male mice, whereas it increased significantly in female mice. The expression levels of NPY and AGRP in the hypothalamus, which are transmitted by elevated peripheral ghrelin signals, increased significantly in isolated young male mice, whereas the AGRP expression levels decreased significantly in young female mice. Isolation caused no significant differences in the expression levels of these genes in aged mice. In isolation, young female mice exhibited markedly increased dark- and light-phase locomotor activities compared with male mice, whereas male and female aged mice exhibited no obvious increases in activity immediately after the dark phase started. We conclude that the gender-specific homeostatic regulatory mechanisms required to maintain body weight operated during subchronic psychological stress in young mice but not in aged mice.
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Affiliation(s)
- Chihiro Yamada
- Tsumura Research Laboratories, Tsumura & Co., Ibaraki, Japan
| | - Yayoi Saegusa
- Tsumura Research Laboratories, Tsumura & Co., Ibaraki, Japan
| | - Miwa Nahata
- Tsumura Research Laboratories, Tsumura & Co., Ibaraki, Japan
| | | | - Tomohisa Hattori
- Tsumura Research Laboratories, Tsumura & Co., Ibaraki, Japan
- * E-mail:
| | - Hiroshi Takeda
- Pathophysiology and Therapeutics, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
- Hokkaido University Hospital Gastroenterological Medicine, Sapporo, Hokkaido, Japan
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29
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Maternal nicotine exposure during lactation alters food preference, anxiety-like behavior and the brain dopaminergic reward system in the adult rat offspring. Physiol Behav 2015; 149:131-41. [DOI: 10.1016/j.physbeh.2015.05.040] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 05/26/2015] [Accepted: 05/31/2015] [Indexed: 11/18/2022]
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