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Kim D, Yadav D, Song M. An updated review on animal models to study attention-deficit hyperactivity disorder. Transl Psychiatry 2024; 14:187. [PMID: 38605002 PMCID: PMC11009407 DOI: 10.1038/s41398-024-02893-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 03/18/2024] [Accepted: 03/25/2024] [Indexed: 04/13/2024] Open
Abstract
Attention-deficit hyperactivity disorder (ADHD) is a neuropsychiatric disorder affecting both children and adolescents. Individuals with ADHD experience heterogeneous problems, such as difficulty in attention, behavioral hyperactivity, and impulsivity. Recent studies have shown that complex genetic factors play a role in attention-deficit hyperactivity disorders. Animal models with clear hereditary traits are crucial for studying the molecular, biological, and brain circuit mechanisms underlying ADHD. Owing to their well-managed genetic origins and the relative simplicity with which the function of neuronal circuits is clearly established, models of mice can help learn the mechanisms involved in ADHD. Therefore, in this review, we highlighting the important genetic animal models that can be used to study ADHD.
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Affiliation(s)
- Daegeon Kim
- Department of Life Science, Yeungnam University, Gyeongsan-si, South Korea
| | - Dhananjay Yadav
- Department of Life Science, Yeungnam University, Gyeongsan-si, South Korea
| | - Minseok Song
- Department of Life Science, Yeungnam University, Gyeongsan-si, South Korea.
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2
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Gungor Aydin A, Adiguzel E. The mesocortical dopaminergic system cannot explain hyperactivity in an animal model of attention deficit hyperactivity disorder (ADHD)- Spontaneously hypertensive rats (SHR). Lab Anim Res 2023; 39:20. [PMID: 37710339 PMCID: PMC10500870 DOI: 10.1186/s42826-023-00172-5] [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: 06/19/2023] [Revised: 08/24/2023] [Accepted: 09/02/2023] [Indexed: 09/16/2023] Open
Abstract
BACKGROUND Attention deficit hyperactivity disorder (ADHD) is one of the most prevalent neuropsychiatric disorders with morphological brain abnormalities. There is a growing body of evidence that abnormalities in the dopaminergic system may account for ADHD pathogenesis. However, it is not clear whether the dopaminergic system is hyper or hypoactive. To determine whether the DA neurons and/or axons deficiency might be the cause of the postulated dopaminergic hypofunction in spontaneously hypertensive rats (SHR, animal model of ADHD), this study examined the dopaminergic neurons and fibers in the brain tissues of SHRs and Wistar Kyoto rats (WKY, control animals). Here, we performed immunohistochemical tyrosine hydroxylase (TH) and dopamine-beta-hydroxylase (DBH) staining on brain sections collected on juveniles from SHR and WKY. Moreover, behavioral testing to examine the hyperactivity in the open field area was also elucidated. RESULTS The mesocortical dopaminergic system appears to be normal in juvenile SHR, as suggested by (i) no alteration in the area density of TH-immunoreactive (TH-ir) dopaminergic neurons in the ventral tegmental area (VTA), (ii) no alterations in the volume density of TH-ir fibers in layer I of the prelimbic (PrL) subregion of medial PFC (mPFC), (iii) no alteration in the percentage of TH-ir dopaminergic fibers in layer I of the PrL subregion of mPFC as revealed by TH and/or DBH immunoreactivity. Furthermore, the SHR showed increased locomotor activity than WKY in the open field test. CONCLUSIONS The demonstration of no alteration in mesocortical dopaminergic neurons and fiber in SHR raises some concern about the position of SHR as an animal model of the inattentive subtype of ADHD. However, these results strengthen this strain as an animal model of hyperactive/impulsive subtype ADHD for future studies that may elucidate the underlying mechanism mediating hyperactivity and test various treatment strategies.
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Affiliation(s)
- Aysegul Gungor Aydin
- Department of Psychology, Rutgers University-New Brunswick, Piscataway, NJ, 08854, USA.
| | - Esat Adiguzel
- Department of Anatomy, Faculty of Medicine, Pamukkale University, 20070, Denizli, Turkey
- Department of Neuroscience, Institute of Health Sciences, Pamukkale University, 20070, Denizli, Turkey
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3
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Xu X, Zhuo L, Zhang L, Peng H, Lyu Y, Sun H, Zhai Y, Luo D, Wang X, Li X, Li L, Zhang Y, Ma X, Wang Q, Li Y. Dexmedetomidine alleviates host ADHD-like behaviors by reshaping the gut microbiota and reducing gut-brain inflammation. Psychiatry Res 2023; 323:115172. [PMID: 36958092 DOI: 10.1016/j.psychres.2023.115172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 02/28/2023] [Accepted: 03/14/2023] [Indexed: 03/25/2023]
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is one of the most prevalent psychiatric disorders that affects children and even continues into adulthood. Dexmedetomidine (DEX), a short-term sedative, can selectively activate the α2-adrenoceptor. Treatment with α2-adrenergic agonists in patients with ADHD is becoming increasingly common. However, the therapeutic potential of DEX for the treatment of ADHD is unknown. Here, we evaluated the effect of DEX on ADHD-like behavior in spontaneously hypertensive rats (SHRs), a widely used animal model of ADHD. DEX treatment ameliorated hyperactivity and spatial working memory deficits and normalized θ electroencephalogram (EEG) rhythms in SHRs. We also found that DEX treatment altered the gut microbiota composition and promoted the enrichment of beneficial gut bacterial genera associated with anti-inflammatory effects in SHRs. The gut pathological scores and permeability and the level of inflammation observed in the gut and brain were remarkably improved after DEX administration. Moreover, transplantation of fecal microbiota from DEX-treated SHRs produced effects that mimicked the therapeutic effects of DEX administration. Therefore, DEX is a promising treatment for ADHD that functions by reshaping the composition of the gut microbiota and reducing inflammation in the gut and brain.
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Affiliation(s)
- Xiangzhao Xu
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China; Department of Anesthesiology, The People's Hospital of Nanchuan, Chongqing 408400, China
| | - Lixia Zhuo
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Linjuan Zhang
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Huan Peng
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Yixuan Lyu
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Huan Sun
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Yifang Zhai
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Danlei Luo
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Xiaodan Wang
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Xinyang Li
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Liya Li
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Ying Zhang
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Xiancang Ma
- Department of Psychiatry, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Qiang Wang
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China
| | - Yan Li
- Department of Anesthesiology and Perioperative Medicine and Center for Brain Science, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China.
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Spontaneously hypertensive rats manifest deficits in emotional response to 22-kHz and 50-kHz ultrasonic playback. Prog Neuropsychopharmacol Biol Psychiatry 2023; 120:110615. [PMID: 36007820 DOI: 10.1016/j.pnpbp.2022.110615] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/03/2022] [Accepted: 08/13/2022] [Indexed: 10/15/2022]
Abstract
Many symptoms used routinely for human psychiatric diagnosis cannot be directly observed in animals which cannot describe their internal states. However, the ultrasonic vocalizations (USV) rodents use to communicate their emotional states can be measured. USV have therefore become a particularly useful tool in brain disease models. Spontaneously hypertensive rats (SHR) are considered an animal model of attention deficit hyperactivity disorder (ADHD) and schizophrenia. However, the specifics of SHR's behavior have not been fully described and there is very little data on their USV. Recently, we developed a communication model, in which Wistar rats are exposed to pre-recorded playbacks of aversive (22-kHz) or appetitive (50-kHz) USV, and their vocal responses depend on the extent of prior fear conditioning (0, 1, 6 or 10 shocks). Here, we investigated SHR's behavior and heart rate (HR) in our communication model, in comparison to Wistar rats employed as controls. In general, SHR emitted typical USV categories, however, they contained more short 22-kHz and less 50-kHz USV overall. Moreover, fewer SHR, in comparison with Wistar rats, emitted long 22-kHz USV after fear conditioning. SHR did not show a 50-kHz playback-induced HR increase, while they showed a profound 22-kHz playback-induced HR decrease. Finally, the number of previously delivered conditioning shocks appeared to have no effect on the investigated vocal, locomotor and HR responses of SHR. The phenomena observed in SHR are potentially attributable to deficits in emotional perception and processing. A lower number of 50-kHz USV emitted by SHR may reflect observations of speech impairments in human patients and further supports the usefulness of SHR to model ADHD and schizophrenia.
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Cabana-Domínguez J, Antón-Galindo E, Fernàndez-Castillo N, Singgih EL, O'Leary A, Norton WH, Strekalova T, Schenck A, Reif A, Lesch KP, Slattery D, Cormand B. The translational genetics of ADHD and related phenotypes in model organisms. Neurosci Biobehav Rev 2023; 144:104949. [PMID: 36368527 DOI: 10.1016/j.neubiorev.2022.104949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 11/02/2022] [Accepted: 11/05/2022] [Indexed: 11/10/2022]
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is a highly prevalent neurodevelopmental disorder resulting from the interaction between genetic and environmental risk factors. It is well known that ADHD co-occurs frequently with other psychiatric disorders due, in part, to shared genetics factors. Although many studies have contributed to delineate the genetic landscape of psychiatric disorders, their specific molecular underpinnings are still not fully understood. The use of animal models can help us to understand the role of specific genes and environmental stimuli-induced epigenetic modifications in the pathogenesis of ADHD and its comorbidities. The aim of this review is to provide an overview on the functional work performed in rodents, zebrafish and fruit fly and highlight the generated insights into the biology of ADHD, with a special focus on genetics and epigenetics. We also describe the behavioral tests that are available to study ADHD-relevant phenotypes and comorbid traits in these models. Furthermore, we have searched for new models to study ADHD and its comorbidities, which can be useful to test potential pharmacological treatments.
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Affiliation(s)
- Judit Cabana-Domínguez
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona, Barcelona, Catalonia, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Spain; Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Catalonia, Spain; Institut de Recerca Sant Joan de Déu (IR-SJD), Esplugues de Llobregat, Catalonia, Spain.
| | - Ester Antón-Galindo
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona, Barcelona, Catalonia, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Spain; Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Catalonia, Spain; Institut de Recerca Sant Joan de Déu (IR-SJD), Esplugues de Llobregat, Catalonia, Spain
| | - Noèlia Fernàndez-Castillo
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona, Barcelona, Catalonia, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Spain; Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Catalonia, Spain; Institut de Recerca Sant Joan de Déu (IR-SJD), Esplugues de Llobregat, Catalonia, Spain
| | - Euginia L Singgih
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Aet O'Leary
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany; Division of Neuropsychopharmacology, Department of Psychology, University of Tartu, Tartu, Estonia
| | - William Hg Norton
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
| | - Tatyana Strekalova
- Division of Molecular Psychiatry, Center of Mental Health, University of Würzburg, Würzburg, Germany, and Department of Neuropsychology and Psychiatry, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht, the Netherlands
| | - Annette Schenck
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Andreas Reif
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany
| | - Klaus-Peter Lesch
- Division of Molecular Psychiatry, Center of Mental Health, University of Würzburg, Würzburg, Germany, and Department of Neuropsychology and Psychiatry, School for Mental Health and Neuroscience (MHeNS), Maastricht University, Maastricht, the Netherlands
| | - David Slattery
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany
| | - Bru Cormand
- Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia, Universitat de Barcelona, Barcelona, Catalonia, Spain; Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Instituto de Salud Carlos III, Spain; Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Catalonia, Spain; Institut de Recerca Sant Joan de Déu (IR-SJD), Esplugues de Llobregat, Catalonia, Spain.
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Oliveras I, Cañete T, Sampedro-Viana D, Río-Álamos C, Tobeña A, Corda MG, Giorgi O, Fernández-Teruel A. Neurobehavioral Profiles of Six Genetically-based Rat Models of Schizophrenia- related Symptoms. Curr Neuropharmacol 2023; 21:1934-1952. [PMID: 36809938 PMCID: PMC10514524 DOI: 10.2174/1570159x21666230221093644] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 11/02/2022] [Accepted: 11/28/2022] [Indexed: 02/24/2023] Open
Abstract
Schizophrenia is a chronic and severe mental disorder with high heterogeneity in its symptoms clusters. The effectiveness of drug treatments for the disorder is far from satisfactory. It is widely accepted that research with valid animal models is essential if we aim at understanding its genetic/ neurobiological mechanisms and finding more effective treatments. The present article presents an overview of six genetically-based (selectively-bred) rat models/strains, which exhibit neurobehavioral schizophrenia-relevant features, i.e., the Apomorphine-susceptible (APO-SUS) rats, the Low-prepulse inhibition rats, the Brattleboro (BRAT) rats, the Spontaneously Hypertensive rats (SHR), the Wisket rats and the Roman High-Avoidance (RHA) rats. Strikingly, all the strains display impairments in prepulse inhibition of the startle response (PPI), which remarkably, in most cases are associated with novelty-induced hyperlocomotion, deficits of social behavior, impairment of latent inhibition and cognitive flexibility, or signs of impaired prefrontal cortex (PFC) function. However, only three of the strains share PPI deficits and dopaminergic (DAergic) psychostimulant-induced hyperlocomotion (together with prefrontal cortex dysfunction in two models, the APO-SUS and RHA), which points out that alterations of the mesolimbic DAergic circuit are a schizophrenia-linked trait that not all models reproduce, but it characterizes some strains that can be valid models of schizophrenia-relevant features and drug-addiction vulnerability (and thus, dual diagnosis). We conclude by putting the research based on these genetically-selected rat models in the context of the Research Domain Criteria (RDoC) framework, suggesting that RDoC-oriented research programs using selectively-bred strains might help to accelerate progress in the various aspects of the schizophrenia-related research agenda.
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Affiliation(s)
- Ignasi Oliveras
- Medical Psychology Unit, Department of Psychiatry and Forensic Medicine & Institute of Neurosciences, School of Medicine, Autonomous University of Barcelona, Bellaterra, Barcelona, 08193, Spain
| | - Toni Cañete
- Medical Psychology Unit, Department of Psychiatry and Forensic Medicine & Institute of Neurosciences, School of Medicine, Autonomous University of Barcelona, Bellaterra, Barcelona, 08193, Spain
| | - Daniel Sampedro-Viana
- Medical Psychology Unit, Department of Psychiatry and Forensic Medicine & Institute of Neurosciences, School of Medicine, Autonomous University of Barcelona, Bellaterra, Barcelona, 08193, Spain
| | | | - Adolf Tobeña
- Medical Psychology Unit, Department of Psychiatry and Forensic Medicine & Institute of Neurosciences, School of Medicine, Autonomous University of Barcelona, Bellaterra, Barcelona, 08193, Spain
| | - Maria Giuseppa Corda
- Department of Life and Environmental Sciences (DiSVA), University of Cagliari, Sardinia, Italy
| | - Osvaldo Giorgi
- Department of Life and Environmental Sciences (DiSVA), University of Cagliari, Sardinia, Italy
| | - Alberto Fernández-Teruel
- Medical Psychology Unit, Department of Psychiatry and Forensic Medicine & Institute of Neurosciences, School of Medicine, Autonomous University of Barcelona, Bellaterra, Barcelona, 08193, Spain
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Grünblatt E, Homolak J, Babic Perhoc A, Davor V, Knezovic A, Osmanovic Barilar J, Riederer P, Walitza S, Tackenberg C, Salkovic-Petrisic M. From attention-deficit hyperactivity disorder to sporadic Alzheimer's disease-Wnt/mTOR pathways hypothesis. Front Neurosci 2023; 17:1104985. [PMID: 36875654 PMCID: PMC9978448 DOI: 10.3389/fnins.2023.1104985] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 01/31/2023] [Indexed: 02/18/2023] Open
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disorder with the majority of patients classified as sporadic AD (sAD), in which etiopathogenesis remains unresolved. Though sAD is argued to be a polygenic disorder, apolipoprotein E (APOE) ε4, was found three decades ago to pose the strongest genetic risk for sAD. Currently, the only clinically approved disease-modifying drugs for AD are aducanumab (Aduhelm) and lecanemab (Leqembi). All other AD treatment options are purely symptomatic with modest benefits. Similarly, attention-deficit hyperactivity disorder (ADHD), is one of the most common neurodevelopmental mental disorders in children and adolescents, acknowledged to persist in adulthood in over 60% of the patients. Moreover, for ADHD whose etiopathogenesis is not completely understood, a large proportion of patients respond well to treatment (first-line psychostimulants, e.g., methylphenidate/MPH), however, no disease-modifying therapy exists. Interestingly, cognitive impairments, executive, and memory deficits seem to be common in ADHD, but also in early stages of mild cognitive impairment (MCI), and dementia, including sAD. Therefore, one of many hypotheses is that ADHD and sAD might have similar origins or that they intercalate with one another, as shown recently that ADHD may be considered a risk factor for sAD. Intriguingly, several overlaps have been shown between the two disorders, e.g., inflammatory activation, oxidative stress, glucose and insulin pathways, wingless-INT/mammalian target of rapamycin (Wnt/mTOR) signaling, and altered lipid metabolism. Indeed, Wnt/mTOR activities were found to be modified by MPH in several ADHD studies. Wnt/mTOR was also found to play a role in sAD and in animal models of the disorder. Moreover, MPH treatment in the MCI phase was shown to be successful for apathy including some improvement in cognition, according to a recent meta-analysis. In several AD animal models, ADHD-like behavioral phenotypes have been observed indicating a possible interconnection between ADHD and AD. In this concept paper, we will discuss the various evidence in human and animal models supporting the hypothesis in which ADHD might increase the risk for sAD, with common involvement of the Wnt/mTOR-pathway leading to lifespan alteration at the neuronal levels.
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Affiliation(s)
- Edna Grünblatt
- Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric University Hospital Zurich (PUK), University of Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and the Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Jan Homolak
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Ana Babic Perhoc
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Virag Davor
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Ana Knezovic
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Jelena Osmanovic Barilar
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
| | - Peter Riederer
- Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital Würzburg, Würzburg, Germany.,Department and Research Unit of Psychiatry, Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Susanne Walitza
- Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric University Hospital Zurich (PUK), University of Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and the Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Christian Tackenberg
- Neuroscience Center Zurich, University of Zurich and the Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland.,Institute for Regenerative Medicine (IREM), University of Zurich, Schlieren, Switzerland
| | - Melita Salkovic-Petrisic
- Department of Pharmacology and Croatian Institute for Brain Research, University of Zagreb School of Medicine, Zagreb, Croatia
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Evidence of methylphenidate effect on mitochondria, redox homeostasis, and inflammatory aspects: Insights from animal studies. Prog Neuropsychopharmacol Biol Psychiatry 2022; 116:110518. [PMID: 35092763 DOI: 10.1016/j.pnpbp.2022.110518] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 01/19/2022] [Accepted: 01/21/2022] [Indexed: 11/22/2022]
Abstract
Methylphenidate (MPH) is a central nervous system (CNS) stimulant known for its effectiveness in the treatment of Attention Deficit Hyperactivity Disorder (ADHD), a neuropsychiatric condition that has a high incidence in childhood and affects behavior and cognition. However, the increase in its use among individuals who do not present all the diagnostic criteria for ADHD has become a serious public health problem since the neurological and psychiatric consequences of this unrestricted use are not widely known. In addition, since childhood is a critical period for the maturation of the CNS, the high prescription of MPH for preschool children also raises several concerns. This review brings new perspectives on how MPH (in different doses, routes of administration and ages) affects the CNS, focusing on animal studies that evaluated changes in mitochondrial (bioenergetics), redox balance and apoptosis, as well as inflammatory parameters. MPH alters brain energy homeostasis, increasing glucose consumption and impairing the activity of enzymes in the Krebs cycle and electron transport chain, as well as ATP levels and Na+,K+-ATPase activity. MPH induces oxidative stress, increasing the levels of reactive oxygen and nitrogen species and altering enzymatic and non-enzymatic antioxidant defenses, which, consequently, is related to damage to proteins, lipids, and DNA. Among the harmful effects of MPH, studies also demonstrate its ability to induce inflammation as well as alter the apoptosis pathway. It is important to highlight that age, treatment time, administration route, and dose are factors that can influence MPH effects. However, young animals seem to be more susceptible to damage caused by MPH. It is possible that changes in mitochondrial function and markers of status oxidative, apoptosis and inflammation may be exerting important mechanisms associated with MPH toxicity and, therefore, the unrestricted use of this drug can cause brain damage.
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9
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González-Barriga F, Orduña V. Spontaneously hypertensive rats show higher impulsive action, but equal impulsive choice with both positive and aversive consequences. Behav Brain Res 2022; 427:113858. [PMID: 35339564 DOI: 10.1016/j.bbr.2022.113858] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/16/2022] [Accepted: 03/19/2022] [Indexed: 11/02/2022]
Abstract
Both positive and aversive delayed consequences play an important role in decision making. However, most of research has studied the temporal discounting of the positive consequences, while the study of the aversives is scarce in general and null in some areas. This is the case of research on impulsivity in spontaneously hypertensive rats (SHR), an animal model of ADHD. To evaluate SHRs' sensitivity to aversive delayed consequences, we employed a choice procedure in which subjects chose between a smaller-amount alternative and a larger-amount alternative plus a shock; when preference for the smaller-amount alternative stabilized, five different delays to the shock were presented with the objective of analyzing the recovery of preference for the larger-amount alternative, which is related to the sensitivity to the delayed aversive consequence. To analyze the sensitivity to delayed positive consequences we employed a procedure that evaluated the preference between a smaller-amount alternative and a larger-amount alternative as a function of the delay to the later. Finally, to evaluate impulsive action we employed a DRL 10s schedule. In all tasks, Wistar rats were evaluated as control strain. The results indicated that choice impulsivity was equivalent between strains, both for positive and for aversive consequences. In contrast, we found a higher level of impulsive action in SHR.
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Affiliation(s)
| | - Vladimir Orduña
- Facultad de Psicología, Universidad Nacional Autónoma de México, México D.F. 04510, México.
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10
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Kantak KM. Rodent models of attention-deficit hyperactivity disorder: An updated framework for model validation and therapeutic drug discovery. Pharmacol Biochem Behav 2022; 216:173378. [DOI: 10.1016/j.pbb.2022.173378] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 03/22/2022] [Accepted: 03/28/2022] [Indexed: 01/21/2023]
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Regan SL, Williams MT, Vorhees CV. Review of rodent models of attention deficit hyperactivity disorder. Neurosci Biobehav Rev 2022; 132:621-637. [PMID: 34848247 PMCID: PMC8816876 DOI: 10.1016/j.neubiorev.2021.11.041] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 01/03/2023]
Abstract
Attention deficit hyperactivity disorder (ADHD) is a polygenic neurodevelopmental disorder that affects 8-12 % of children and >4 % of adults. Environmental factors are believed to interact with genetic predispositions to increase susceptibility to ADHD. No existing rodent model captures all aspects of ADHD, but several show promise. The main genetic models are the spontaneous hypertensive rat, dopamine transporter knock-out (KO) mice, dopamine receptor subtype KO mice, Snap-25 KO mice, guanylyl cyclase-c KO mice, and latrophilin-3 KO mice and rats. Environmental factors thought to contribute to ADHD include ethanol, nicotine, PCBs, lead (Pb), ionizing irradiation, 6-hydroxydopamine, neonatal hypoxia, some pesticides, and organic pollutants. Model validation criteria are outlined, and current genetic models evaluated against these criteria. Future research should explore induced multiple gene KOs given that ADHD is polygenic and epigenetic contributions. Furthermore, genetic models should be combined with environmental agents to test for interactions.
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Affiliation(s)
- Samantha L. Regan
- Neuroscience Graduate Program, University of Cincinnati, Cincinnati, OH 45229
| | - Michael T. Williams
- Department of Pediatrics, University of Cincinnati College of Medicine, and Division of Neurology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229
| | - Charles V. Vorhees
- Department of Pediatrics, University of Cincinnati College of Medicine, and Division of Neurology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229,Corresponding author: Charles V. Vorhees, Ph.D., Div. of Neurology, Cincinnati Children’s Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH 45229, USA:
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12
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Stanford SC. Animal Models of ADHD? Curr Top Behav Neurosci 2022; 57:363-393. [PMID: 35604570 DOI: 10.1007/7854_2022_342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To describe animals that express abnormal behaviors as a model of Attention-Deficit Hyperactivity Disorder (ADHD) implies that the abnormalities are analogous to those expressed by ADHD patients. The diagnostic features of ADHD comprise inattentiveness, impulsivity, and hyperactivity and so these behaviors are fundamental for validation of any animal model of this disorder. Several experimental interventions such as neurotoxic lesion of neonatal rats with 6-hydroxydopamine (6-OHDA), genetic alterations, or selective inbreeding of rodents have produced animals that express each of these impairments to some extent. This article appraises the validity of claims that these procedures have produced a model of ADHD, which is essential if they are to be used to investigate the underlying cause(s) of ADHD and its abnormal neurobiology.
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Affiliation(s)
- S Clare Stanford
- Department of Neuroscience Physiology and Pharmacology, University College London, London, UK.
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13
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Kantak KM, Stots C, Mathieson E, Bryant CD. Spontaneously Hypertensive Rat substrains show differences in model traits for addiction risk and cocaine self-administration: Implications for a novel rat reduced complexity cross. Behav Brain Res 2021; 411:113406. [PMID: 34097899 PMCID: PMC8265396 DOI: 10.1016/j.bbr.2021.113406] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 05/28/2021] [Accepted: 06/03/2021] [Indexed: 12/17/2022]
Abstract
Forward genetic mapping of F2 crosses between closely related substrains of inbred rodents - referred to as a reduced complexity cross (RCC) - is a relatively new strategy for accelerating the pace of gene discovery for complex traits, such as drug addiction. RCCs to date were generated in mice, but rats are thought to be optimal for addiction genetic studies. Based on past literature, one inbred Spontaneously Hypertensive Rat substrain, SHR/NCrl, is predicted to exhibit a distinct behavioral profile as it relates to cocaine self-administration traits relative to another substrain, SHR/NHsd. Direct substrain comparisons are a necessary first step before implementing an RCC. We evaluated model traits for cocaine addiction risk and cocaine self-administration behaviors using a longitudinal within-subjects design. Impulsive-like and compulsive-like traits were greater in SHR/NCrl than SHR/NHsd, as were reactivity to sucrose reward, sensitivity to acute psychostimulant effects of cocaine, and cocaine use studied under fixed-ratio and tandem schedules of cocaine self-administration. Compulsive-like behavior correlated with the acute psychostimulant effects of cocaine, which in turn correlated with cocaine taking under the tandem schedule. Compulsive-like behavior also was the best predictor of cocaine seeking responses. Heritability estimates indicated that 22 %-40 % of the variances for the above phenotypes can be explained by additive genetic factors, providing sufficient genetic variance to conduct genetic mapping in F2 crosses of SHR/NCrl and SHR/NHsd. These results provide compelling support for using an RCC approach in SHR substrains to uncover candidate genes and variants that are of relevance to cocaine use disorders.
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Affiliation(s)
- Kathleen M Kantak
- Department of Psychological and Brain Sciences, Boston University, Boston, MA, USA; Center for Systems Neuroscience, Boston University, Boston, MA, USA.
| | - Carissa Stots
- Department of Psychological and Brain Sciences, Boston University, Boston, MA, USA
| | - Elon Mathieson
- Department of Psychological and Brain Sciences, Boston University, Boston, MA, USA
| | - Camron D Bryant
- Departments of Pharmacology and Experimental Therapeutics and Psychiatry, Boston University School of Medicine, Boston, MA, USA; Center for Systems Neuroscience, Boston University, Boston, MA, USA
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14
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Dupuy C, Castelnau P, Mavel S, Lefevre A, Nadal-Desbarats L, Bodard S, Busson J, Dufour-Rainfray D, Blasco H, Emond P, Galineau L. SHR/NCrl rats as a model of ADHD can be discriminated from controls based on their brain, blood, or urine metabolomes. Transl Psychiatry 2021; 11:235. [PMID: 33888684 PMCID: PMC8062531 DOI: 10.1038/s41398-021-01344-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 03/18/2021] [Accepted: 03/30/2021] [Indexed: 02/02/2023] Open
Abstract
Attention-Deficit Hyperactivity Disorder (ADHD) is one of the most common neurodevelopmental disorder characterized by inattention, impulsivity, and hyperactivity. The neurobiological mechanisms underlying ADHD are still poorly understood, and its diagnosis remains difficult due to its heterogeneity. Metabolomics is a recent strategy for the holistic exploration of metabolism and is well suited for investigating the pathophysiology of diseases and finding molecular biomarkers. A few clinical metabolomic studies have been performed on peripheral samples from ADHD patients but are limited by their access to the brain. Here, we investigated the brain, blood, and urine metabolomes of SHR/NCrl vs WKY/NHsd rats to better understand the neurobiology and to find potential peripheral biomarkers underlying the ADHD-like phenotype of this animal model. We showed that SHR/NCrl rats can be differentiated from controls based on their brain, blood, and urine metabolomes. In the brain, SHR/NCrl rats displayed modifications in metabolic pathways related to energy metabolism and oxidative stress further supporting their importance in the pathophysiology of ADHD bringing news arguments in favor of the Neuroenergetic theory of ADHD. Besides, the peripheral metabolome of SHR/NCrl rats also shared more than half of these differences further supporting the importance of looking at multiple matrices to characterize a pathophysiological condition of an individual. This also stresses out the importance of investigating the peripheral energy and oxidative stress metabolic pathways in the search of biomarkers of ADHD.
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Affiliation(s)
- Camille Dupuy
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Pierre Castelnau
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
| | - Sylvie Mavel
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Antoine Lefevre
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | | | - Sylvie Bodard
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Julie Busson
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - Diane Dufour-Rainfray
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
| | - Helene Blasco
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
| | - Patrick Emond
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
- CHRU Tours, Tours, France
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15
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Jogamoto T, Utsunomiya R, Sato A, Kihara N, Choudhury ME, Miyanishi K, Kubo M, Nagai M, Nomoto M, Yano H, Shimizu YI, Fukuda M, Ishii E, Eguchi M, Tanaka J. Lister hooded rats as a novel animal model of attention-deficit/hyperactivity disorder. Neurochem Int 2020; 141:104857. [DOI: 10.1016/j.neuint.2020.104857] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 08/17/2020] [Accepted: 09/28/2020] [Indexed: 02/07/2023]
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16
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ADHD-like behaviors caused by inactivation of a transcription factor controlling the balance of inhibitory and excitatory neuron development in the mouse anterior brainstem. Transl Psychiatry 2020; 10:357. [PMID: 33087695 PMCID: PMC7578792 DOI: 10.1038/s41398-020-01033-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 07/28/2020] [Accepted: 07/30/2020] [Indexed: 12/31/2022] Open
Abstract
The neural circuits regulating motivation and movement include midbrain dopaminergic neurons and associated inhibitory GABAergic and excitatory glutamatergic neurons in the anterior brainstem. Differentiation of specific subtypes of GABAergic and glutamatergic neurons in the mouse embryonic brainstem is controlled by a transcription factor Tal1. This study characterizes the behavioral and neurochemical changes caused by the absence of Tal1 function. The Tal1cko mutant mice are hyperactive, impulsive, hypersensitive to reward, have learning deficits and a habituation defect in a novel environment. Only minor changes in their dopaminergic system were detected. Amphetamine induced striatal dopamine release and amphetamine induced place preference were normal in Tal1cko mice. Increased dopamine signaling failed to stimulate the locomotor activity of the Tal1cko mice, but instead alleviated their hyperactivity. Altogether, the Tal1cko mice recapitulate many features of the attention and hyperactivity disorders, suggesting a role for Tal1 regulated developmental pathways and neural structures in the control of motivation and movement.
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17
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Response-inhibition capacity in spontaneously hypertensive and Wistar rats: acquisition of fixed minimum interval performance and responsiveness to D-amphetamine. Behav Pharmacol 2019; 29:668-675. [PMID: 29877871 DOI: 10.1097/fbp.0000000000000411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Reduced response-inhibition capacity is a defining feature of attention-deficit hyperactivity disorder. The fixed minimum interval (FMI) schedule has been systematically validated to assess such capacity in rats. On each FMI trial, the first lever press initiates an inter-response time (IRT); a potentially consummatory response terminates the IRT; only IRTs longer than a target interval result in access to food. Despite task validity, steady-state FMI performance in the most common animal model of attention-deficit hyperactivity disorder, the spontaneously hypertensive rat (SHR), is similar to normotensive control performance, even though SHR performs at lower levels, especially during acquisition, in similar response-withholding tasks. To determine whether such limitations of the model are specific to stable-state performance, this experiment compared FMI 6-s performance in SHR and Wistar rats during acquisition and in steady state, and assessed the effect of acute D-amphetamine (AMP) administration (0.1, 0.5, and 1.0 mg/kg) on steady-state performance. Median latencies to first lever press were consistently shorter in SHR than in Wistar rats; IRTs were shorter for SHR than for Wistar rats during acquisition, but substantially less so during asymptotic performance. AMP dose-dependently reduced latencies, shortened IRTs, and, at the highest dose, increased the proportion of IRTs under schedule control. These results suggest that, relative to Wistar rats, SHR have a reduced capacity to learn to withhold a reinforced response; once the FMI is acquired, high doses of D-AMP disrupt withholding performance in both strains, but they also enhance the responsiveness of both strains to reinforcement contingencies.
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18
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Young spontaneously hypertensive rats (SHRs) display prodromal schizophrenia-like behavioral abnormalities. Prog Neuropsychopharmacol Biol Psychiatry 2019; 90:169-176. [PMID: 30500412 DOI: 10.1016/j.pnpbp.2018.11.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 10/05/2018] [Accepted: 11/24/2018] [Indexed: 11/24/2022]
Abstract
The Spontaneously Hypertensive Rat (SHR) strain has been suggested as an animal model of schizophrenia, considering that adult SHRs display behavioral abnormalities that mimic the cognitive, psychotic and negative symptoms of the disease and are characteristic of its animal models. SHRs display: (I) deficits in fear conditioning and latent inhibition (modeling cognitive impairments), (II) deficit in prepulse inhibition of startle reflex (reflecting a deficit in sensorimotor gating, and associated with psychotic symptoms), (III) diminished social behavior (modeling negative symptoms) and (IV) hyperlocomotion (modeling the hyperactivity of the dopaminergic mesolimbic system/ psychotic symptoms). These behavioral abnormalities are reversed specifically by the administration of antipsychotic drugs. Here, we performed a behavioral characterization of young (27-50 days old) SHRs in order to investigate potential early behavioral abnormalities resembling the prodromal phase of schizophrenia. When compared to Wistar rats, young SHRs did not display hyperlocomotion or PPI deficit, but exhibited diminished social interaction and impaired fear conditioning and latent inhibition. These findings are in accordance with the clinical course of schizophrenia: manifestation of social and cognitive impairments and absence of full-blown psychotic symptoms in the prodromal phase. The present data reinforce the SHR strain as a model of schizophrenia, expanding its validity to the prodromal phase of the disorder.
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19
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Leffa DT, Panzenhagen AC, Salvi AA, Bau CHD, Pires GN, Torres ILS, Rohde LA, Rovaris DL, Grevet EH. Systematic review and meta-analysis of the behavioral effects of methylphenidate in the spontaneously hypertensive rat model of attention-deficit/hyperactivity disorder. Neurosci Biobehav Rev 2019; 100:166-179. [PMID: 30826386 DOI: 10.1016/j.neubiorev.2019.02.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Revised: 02/27/2019] [Accepted: 02/27/2019] [Indexed: 12/19/2022]
Abstract
The spontaneously hypertensive rats (SHR) are the most widely used model for ADHD. While face and construct validity are consolidated, questions remain about the predictive validity of the SHR model. We aim at summarizing the evidence for the predictive validity of SHR by evaluating its ability to respond to methylphenidate (MPH), the most well documented treatment for ADHD. A systematic review was carried out to identify studies evaluating MPH effects on SHR behavior. Studies (n=36) were grouped into locomotion, attention, impulsivity or memory, and a meta-analysis was performed. Meta-regression, sensitivity, heterogeneity, and publication bias analyses were also conducted. MPH increased attentional and mnemonic performances in the SHR model and decreased impulsivity in a dose-dependent manner. However, MPH did not reduce hyperactivity in low and medium doses, while increased locomotor activity in high doses. Thus, since the paradoxical effect of stimulant in reducing hyperactivity was not observed in the SHR model, our study does not fully support the predictive validity of SHR, questioning their validity as an animal model for ADHD.
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Affiliation(s)
- Douglas T Leffa
- Post-Graduate Program in Medicine: Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Laboratory of Pain Pharmacology and Neuromodulation: Pre-clinical studies - Pharmacology Department, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Alana C Panzenhagen
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Brazil
| | - Artur A Salvi
- Laboratory of Pain Pharmacology and Neuromodulation: Pre-clinical studies - Pharmacology Department, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Claiton H D Bau
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Gabriel N Pires
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil; Department of Physiological Sciences, Santa Casa de São Paulo School of Medical Sciences, São Paulo, Brazil
| | - Iraci L S Torres
- Laboratory of Pain Pharmacology and Neuromodulation: Pre-clinical studies - Pharmacology Department, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Animal Experimentation Unit - GPPG - Hospital de Clínicas de Porto Alegre - Porto, Alegre, Brazil
| | - Luis A Rohde
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; National Institute of Developmental Psychiatry for Children and Adolescents, Brazil
| | - Diego L Rovaris
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
| | - Eugenio H Grevet
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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20
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Suh M, Lee DS. Brain Theranostics and Radiotheranostics: Exosomes and Graphenes In Vivo as Novel Brain Theranostics. Nucl Med Mol Imaging 2018; 52:407-419. [PMID: 30538772 PMCID: PMC6261865 DOI: 10.1007/s13139-018-0550-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 09/10/2018] [Accepted: 10/05/2018] [Indexed: 12/17/2022] Open
Abstract
Brain disease is one of the greatest threats to public health. Brain theranostics is recently taking shape, indicating the treatments of stroke, inflammatory brain disorders, psychiatric diseases, neurodevelopmental disease, and neurodegenerative disease. However, several factors, such as lack of endophenotype classification, blood-brain barrier (BBB), target determination, ignorance of biodistribution after administration, and complex intercellular communication between brain cells, make brain theranostics application difficult, especially when it comes to clinical application. So, a more thorough understanding of each aspect is needed. In this review, we focus on recent studies regarding the role of exosomes in intercellular communication of brain cells, therapeutic effect of graphene quantum dots, transcriptomics/epitranscriptomics approach for target selection, and in vitro/in vivo considerations.
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Affiliation(s)
- Minseok Suh
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, 03080 Republic of Korea
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 03080 Republic of Korea
| | - Dong Soo Lee
- Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul, 03080 Republic of Korea
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 03080 Republic of Korea
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21
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Leffa DT, Castro Panzenhagen A, Luiz Rovaris D, Henrique Dotto Bau C, Rohde LA, Horacio Grevet E, Pires GN. Behavioural effects of methylphenidate in the spontaneously hypertensive rat model of attention-deficit/hyperactivity disorder: a systematic review and meta-analysis protocol. BMJ OPEN SCIENCE 2018; 2:e000001. [PMID: 35047675 PMCID: PMC8715948 DOI: 10.1136/bmjos-2018-000001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 06/13/2018] [Indexed: 12/30/2022] Open
Abstract
INTRODUCTION Attention-deficit/hyperactivity disorder (ADHD) is a prevalent condition related to several negative outcomes, and its pathophysiology is still poorly understood. The spontaneously hypertensive rats (SHRs) are the most commonly used animal model of ADHD. How ever, its validity, and especially its predictive validity, has been questioned. Therefore, the current protocol discloses the background, aims and methods of a systematic review and meta-analysis of studies reporting the behavioural effects of methylphenidate (MPH), the most commonly prescribed treatment for ADHD, in the SHR. SEARCH STRATEGY Studies will be identified through a literature search using three different electronic databases: Medline, Embase and Web of Science. There will be no language restrictions. All s tudies that administered MPH to SHR and evaluated locomotion, attention, impulsivity or memory will be included. SCREENING AND ANNOTATION Studies will be prescreened based on title and abstract, and a full-text review will be performed if necessary. Screening will be performed by two authors, and any disagreement will be discussed with a third author. DATA MANAGEMENT AND REPORTING Data extraction will be performed by two independent authors according to a standardised form. Studies will be grouped according to the behavioural outcomes reported, and a meta-analysis will be performed for each group. The influence of predefined covariates on the effects of MPH will be evaluated using meta-regression and sensitivity analyses. Data will be reported following PRISMA guidelines.
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Affiliation(s)
- Douglas Teixeira Leffa
- Post-Graduate Program in Medicine: Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Laboratory of Pain Pharmacology and Neuromodulation: Preclinical Studies - Pharmacology Department, Institute of Basic Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Alana Castro Panzenhagen
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
| | - Diego Luiz Rovaris
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Claiton Henrique Dotto Bau
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Luis Augusto Rohde
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil
| | - Eugenio Horacio Grevet
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
- Department of Psychiatry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Gabriel Natan Pires
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil
- Department of Physiological Sciences, Santa Casa de São Paulo School of Medical Sciences, São Paulo, Brazil
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22
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Neonatal 6-OHDA lesion model in mouse induces Attention-Deficit/ Hyperactivity Disorder (ADHD)-like behaviour. Sci Rep 2018; 8:15349. [PMID: 30337626 PMCID: PMC6193955 DOI: 10.1038/s41598-018-33778-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 10/03/2018] [Indexed: 11/08/2022] Open
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder characterized by impaired attention, impulsivity and hyperactivity. The "neonatal 6-hydroxydopamine" (6-OHDA) lesion is a commonly used model of ADHD in rat. However, a comprehensive assessment of ADHD-like symptoms is still missing, and data in mouse remain largely unavailable. Our aim was to analyse symptoms of ADHD in the mouse neonatal 6-OHDA model. 6-OHDA mice exhibited the major ADHD-like symptoms, i.e. hyperactivity (open field), attention deficit and impulsivity (five-choice serial reaction time task). Further, the model revealed discrete co-existing symptoms, i.e. anxiety-like (elevated plus maze test) and antisocial (social interaction) behaviours and decreased cognitive functioning (novel object recognition). The efficacy of methylphenidate, a classical psychostimulant used in the treatment of ADHD, was also evaluated. A histological analysis further supports the model validity by indicating dopamine depletion, changes in cortical thickness and abnormalities in anterior cingulate cortex neurons. A principal component analysis of the behaviour profile confirms that the 6-OHDA mouse model displayed good face and predictive validity. We conclude that neonatal dopamine depletion results in behavioural and morphological changes similar to those seen in patients and therefore could be used as a model for studying ADHD pathophysiological mechanisms and identifying therapeutic targets.
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23
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Peres FF, Diana MC, Levin R, Suiama MA, Almeida V, Vendramini AM, Santos CM, Zuardi AW, Hallak JEC, Crippa JA, Abílio VC. Cannabidiol Administered During Peri-Adolescence Prevents Behavioral Abnormalities in an Animal Model of Schizophrenia. Front Pharmacol 2018; 9:901. [PMID: 30186164 PMCID: PMC6113576 DOI: 10.3389/fphar.2018.00901] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 07/23/2018] [Indexed: 01/08/2023] Open
Abstract
Schizophrenia is considered a debilitating neurodevelopmental psychiatric disorder and its pharmacotherapy remains problematic without recent major advances. The development of interventions able to prevent the emergence of schizophrenia would therefore represent an enormous progress. Here, we investigated whether treatment with cannabidiol (CBD - a compound of Cannabis sativa that presents an antipsychotic profile in animals and humans) during peri-adolescence would prevent schizophrenia-like behavioral abnormalities in an animal model of schizophrenia: the spontaneously hypertensive rat (SHR) strain. Wistar rats and SHRs were treated with vehicle or CBD from 30 to 60 post-natal days. In experiment 1, schizophrenia-like behaviors (locomotor activity, social interaction, prepulse inhibition of startle and contextual fear conditioning) were assessed on post-natal day 90. Side effects commonly associated with antipsychotic treatment were also evaluated: body weight gain and catalepsy throughout the treatment, and oral dyskinesia 48 h after treatment interruption and on post-natal day 90. In experiment 2, serum levels of triglycerides and glycemia were assessed on post-natal day 61. In experiment 3, levels of BDNF, monoamines, and their metabolites were evaluated on post-natal days 61 and 90 in the prefrontal cortex and striatum. Treatment with CBD prevented the emergence of SHRs' hyperlocomotor activity (a model for the positive symptoms of schizophrenia) and deficits in prepulse inhibition of startle and contextual fear conditioning (cognitive impairments). CBD did not induce any of the potential motor or metabolic side effects evaluated. Treatment with CBD increased the prefrontal cortex 5-HIAA/serotonin ratio and the levels of 5-HIAA on post-natal days 61 and 90, respectively. Our data provide pre-clinical evidence for a safe and beneficial effect of peripubertal and treatment with CBD on preventing positive and cognitive symptoms of schizophrenia, and suggest the involvement of the serotoninergic system on this effect.
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Affiliation(s)
- Fernanda F Peres
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,National Institute for Translational Medicine, National Council for Scientific and Technological Development, Ribeirão Preto, Brazil.,Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Federal University of São Paulo, São Paulo, Brazil
| | - Mariana C Diana
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Federal University of São Paulo, São Paulo, Brazil
| | - Raquel Levin
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Federal University of São Paulo, São Paulo, Brazil
| | - Mayra A Suiama
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Federal University of São Paulo, São Paulo, Brazil
| | - Valéria Almeida
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Federal University of São Paulo, São Paulo, Brazil
| | - Ana M Vendramini
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Federal University of São Paulo, São Paulo, Brazil
| | - Camila M Santos
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Federal University of São Paulo, São Paulo, Brazil
| | - Antônio W Zuardi
- National Institute for Translational Medicine, National Council for Scientific and Technological Development, Ribeirão Preto, Brazil.,Department of Neuroscience and Behavior, University of São Paulo, Ribeirão Preto, Brazil
| | - Jaime E C Hallak
- National Institute for Translational Medicine, National Council for Scientific and Technological Development, Ribeirão Preto, Brazil.,Department of Neuroscience and Behavior, University of São Paulo, Ribeirão Preto, Brazil
| | - José A Crippa
- National Institute for Translational Medicine, National Council for Scientific and Technological Development, Ribeirão Preto, Brazil.,Department of Neuroscience and Behavior, University of São Paulo, Ribeirão Preto, Brazil
| | - Vanessa C Abílio
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil.,National Institute for Translational Medicine, National Council for Scientific and Technological Development, Ribeirão Preto, Brazil.,Department of Neuroscience and Behavior, University of São Paulo, Ribeirão Preto, Brazil
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Peres FF, Eufrásio RÁ, Gouvêa DA, Diana MC, Santos CM, Swardfager W, Abílio VC, Cogo-Moreira H. A schizophrenia-like behavioral trait in the SHR model: Applying confirmatory factor analysis as a new statistical tool. Prog Neuropsychopharmacol Biol Psychiatry 2018; 85:16-22. [PMID: 29625156 DOI: 10.1016/j.pnpbp.2018.03.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 03/23/2018] [Accepted: 03/24/2018] [Indexed: 12/01/2022]
Abstract
Questionnaires that assess symptoms of schizophrenia patients undergo strict statistical validation, often using confirmatory factor analysis (CFA). CFA allows testing the existence of a trait that both collectively explains the symptoms and gathers the information in a single general index. In rodents, some behaviors are used to model psychiatric symptoms, but no single test or paradigm adequately captures the disorder's phenotype in toto. This work investigated the existence of a behavioral trait in the SHR strain underlying five behavioral tasks used in schizophrenia animal studies and altered in this strain: locomotor activity, rearing behavior, social interaction, prepulse inhibition of startle and contextual fear conditioning. The analysis was conducted on a sample of Wistar (n = 290) and Spontaneously Hypertensive Rats (SHRs, n = 290). CFA showed the existence of a continuous trait in both strains, and higher values among SHRs. This work is the first to demonstrate the existence of a schizophrenia-like trait in an animal model. We suggest that using CFA to evaluate behavioral parameters in animals might facilitate the pre-clinical investigation of psychiatric disorders, diminishing the gap between animal and human studies.
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Affiliation(s)
- Fernanda Fiel Peres
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil; LiNC, Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry and Medical Psychology, Federal University of São Paulo, São Paulo, Brazil; National Institute for Translational Medicine, INCT-TM, CNPq, FAPESP, CAPES, Ribeirão Preto, Brazil
| | - Raí Álvares Eufrásio
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil; LiNC, Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry and Medical Psychology, Federal University of São Paulo, São Paulo, Brazil
| | - Douglas Albuquerque Gouvêa
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil; LiNC, Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry and Medical Psychology, Federal University of São Paulo, São Paulo, Brazil
| | - Mariana Cepollaro Diana
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil; LiNC, Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry and Medical Psychology, Federal University of São Paulo, São Paulo, Brazil
| | - Camila Maurício Santos
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil; LiNC, Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry and Medical Psychology, Federal University of São Paulo, São Paulo, Brazil
| | - Walter Swardfager
- Department of Pharmacology & Toxicology, University of Toronto, Toronto, Canada; Hurvitz Brain Sciences Program, Sunnybrook Research Institute, Toronto, Canada
| | - Vanessa Costhek Abílio
- Department of Pharmacology, Federal University of São Paulo, São Paulo, Brazil; LiNC, Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry and Medical Psychology, Federal University of São Paulo, São Paulo, Brazil; National Institute for Translational Medicine, INCT-TM, CNPq, FAPESP, CAPES, Ribeirão Preto, Brazil
| | - Hugo Cogo-Moreira
- LiNC, Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry and Medical Psychology, Federal University of São Paulo, São Paulo, Brazil.
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25
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Leffa DT, Bellaver B, Salvi AA, de Oliveira C, Caumo W, Grevet EH, Fregni F, Quincozes-Santos A, Rohde LA, Torres IL. Transcranial direct current stimulation improves long-term memory deficits in an animal model of attention-deficit/hyperactivity disorder and modulates oxidative and inflammatory parameters. Brain Stimul 2018; 11:743-751. [DOI: 10.1016/j.brs.2018.04.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 03/26/2018] [Accepted: 04/02/2018] [Indexed: 02/07/2023] Open
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26
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Hyperactive behavior in female rats in utero-exposed to group B Streptococcus-induced inflammation. Int J Dev Neurosci 2018; 69:17-22. [PMID: 29920305 DOI: 10.1016/j.ijdevneu.2018.06.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 06/13/2018] [Accepted: 06/15/2018] [Indexed: 11/20/2022] Open
Abstract
Group B Streptococcus (GBS) is one the most common bacterium responsible of maternal infections during pregnancy. Offspring in utero-exposed to GBS-induced placental inflammation displayed sex-specific forebrain injuries. Sex differences have been reported in several neuropsychiatric disorders. Hence, we hypothesized that female rats in utero-exposed to GBS may present sex-specific neurobehavioral impairments. Lewis rats were injected intraperitoneally every 12 h from gestational day (G) 19 to G22 with either saline (controls) or inactivated serotype Ia GBS (109 CFU). Before puberty, no difference in terms of spontaneous motor activity, exploratory or anxiety-related behaviors was noticed between experimental conditions. During puberty, GBS-exposed females - but not males - performed worse than same-sex controls in a forced motor task. During adulthood, GBS-exposed females - but not males - displayed increased spontaneous locomotor activity and decreased inhibition. In conclusion, our findings show for the first time that adult females - but not males - in utero-exposed to GBS-induced inflammation presented a hyperactive and disinhibited phenotype emerging after puberty.
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27
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Yokota T, Struzik ZR, Jurica P, Horiuchi M, Hiroyama S, Li J, Takahara Y, Ogawa K, Nishitomi K, Hasegawa M, Cichocki A. Semi-Automated Biomarker Discovery from Pharmacodynamic Effects on EEG in ADHD Rodent Models. Sci Rep 2018; 8:5202. [PMID: 29581452 PMCID: PMC5980101 DOI: 10.1038/s41598-018-23450-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 03/13/2018] [Indexed: 11/16/2022] Open
Abstract
We propose a novel semi-automatic approach to design biomarkers for capturing pharmacodynamic effects induced by pharmacological agents on the spectral power of electroencephalography (EEG) recordings. We apply this methodology to investigate the pharmacodynamic effects of methylphenidate (MPH) and atomoxetine (ATX) on attention deficit/hyperactivity disorder (ADHD), using rodent models. We inject the two agents into the spontaneously hypertensive rat (SHR) model of ADHD, the Wistar-Kyoto rat (WKY), and the Wistar rat (WIS), and record their EEG patterns. To assess individual EEG patterns quantitatively, we use an integrated methodological approach, which consists of calculating the mean, slope and intercept parameters of temporal records of EEG spectral power using a smoothing filter, outlier truncation, and linear regression. We apply Fisher discriminant analysis (FDA) to identify dominant discriminants to be heuristically consolidated into several new composite biomarkers. Results of the analysis of variance (ANOVA) and t-test show benefits in pharmacodynamic parameters, especially the slope parameter. Composite biomarker evaluation confirms their validity for genetic model stratification and the effects of the pharmacological agents used. The methodology proposed is of generic use as an approach to investigating thoroughly the dynamics of the EEG spectral power.
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Affiliation(s)
- Tatsuya Yokota
- RIKEN Brain Science Institute, Hirosawa, Wako, Saitama, Japan
| | | | - Peter Jurica
- RIKEN Brain Science Institute, Hirosawa, Wako, Saitama, Japan
| | | | | | - Junhua Li
- RIKEN Brain Science Institute, Hirosawa, Wako, Saitama, Japan
| | - Yuji Takahara
- SHIONOGI & Co., Ltd., Futaba, Toyonaka, Osaka, Japan
| | - Koichi Ogawa
- SHIONOGI & Co., Ltd., Futaba, Toyonaka, Osaka, Japan.
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Rizzo F, Nespoli E, Abaei A, Bar-Gad I, Deelchand DK, Fegert J, Rasche V, Hengerer B, Boeckers TM. Aripiprazole Selectively Reduces Motor Tics in a Young Animal Model for Tourette's Syndrome and Comorbid Attention Deficit and Hyperactivity Disorder. Front Neurol 2018; 9:59. [PMID: 29487562 PMCID: PMC5816975 DOI: 10.3389/fneur.2018.00059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 01/23/2018] [Indexed: 12/17/2022] Open
Abstract
Tourette’s syndrome (TS) is a neurodevelopmental disorder characterized primarily by motor and vocal tics. Comorbidities such as attention deficit and hyperactivity disorder (ADHD) are observed in over 50% of TS patients. We applied aripiprazole in a juvenile rat model that displays motor tics and hyperactivity. We additionally assessed the amount of ultrasonic vocalizations (USVs) as an indicator for the presence of vocal tics and evaluated the changes in the striatal neurometabolism using in vivo proton magnetic resonance spectroscopy (1H-MRS) at 11.7T. Thirty-one juvenile spontaneously hypertensive rats (SHRs) underwent bicuculline striatal microinjection and treatment with either aripiprazole or vehicle. Control groups were sham operated and sham injected. Behavior, USVs, and striatal neurochemical profile were analyzed at early, middle, and late adolescence (postnatal days 35 to 50). Bicuculline microinjections in the dorsolateral striatum induced motor tics in SHR juvenile rats. Acute aripiprazole administration selectively reduced both tic frequency and latency, whereas stereotypies, USVs, and hyperactivity remained unaltered. The striatal neurochemical profile was only moderately altered after tic-induction and was not affected by systemic drug treatment. When applied to a young rat model that provides high degrees of construct, face, and predictive validity for TS and comorbid ADHD, aripiprazole selectively reduces motor tics, revealing that tics and stereotypies are distinct phenomena in line with clinical treatment of patients. Finally, our 1H-MRS results suggest a critical revision of the striatal role in the hypothesized cortico-striatal dysregulation in TS pathophysiology.
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Affiliation(s)
- Francesca Rizzo
- Department for Child and Adolescent Psychiatry and Psychotherapy, Ulm University, Ulm, Germany.,Institute of Anatomy and Cell Biology, Ulm University, Ulm, Germany
| | - Ester Nespoli
- Boehringer Ingelheim Pharma GmbH & Co. KG, CNS Diseases, Biberach an der Riss, Germany
| | - Alireza Abaei
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany.,Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Izhar Bar-Gad
- Leslie and Susan Gonda (Goldschmied) Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat Gan, Israel
| | - Dinesh K Deelchand
- Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States
| | - Jörg Fegert
- Department for Child and Adolescent Psychiatry and Psychotherapy, Ulm University, Ulm, Germany
| | - Volker Rasche
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany.,Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Bastian Hengerer
- Boehringer Ingelheim Pharma GmbH & Co. KG, CNS Diseases, Biberach an der Riss, Germany
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Miller EM, Quintero JE, Pomerleau F, Huettl P, Gerhardt GA, Glaser PEA. Chronic Methylphenidate Alters Tonic and Phasic Glutamate Signaling in the Frontal Cortex of a Freely-Moving Rat Model of ADHD. Neurochem Res 2018; 44:89-101. [PMID: 29397534 DOI: 10.1007/s11064-018-2483-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 01/09/2018] [Accepted: 01/22/2018] [Indexed: 01/09/2023]
Abstract
Glutamate dysfunction has been implicated in a number of substance of abuse studies, including cocaine and methamphetamine. Moreover, in attention-deficit/hyperactivity disorder (ADHD), it has been discovered that when the initiation of stimulant treatment occurs during adolescence, there is an increased risk of developing a substance use disorder later in life. The spontaneously hypertensive rat (SHR) serves as a phenotype for ADHD and studies have found increased cocaine self-administration in adult SHRs when treated with the stimulant methylphenidate (MPH) during adolescence. For this reason, we wanted to examine glutamate signaling in the pre-limbic frontal cortex, a region implicated in ADHD and drug addiction, in the SHR and its progenitor control strain, the Wistar Kyoto (WKY). We chronically implanted glutamate-selective microelectrode arrays (MEAs) into 8-week-old animals and treated with MPH (2 mg/kg, s.c.) for 11 days while measuring tonic and phasic extracellular glutamate concentrations. We observed that intermediate treatment with a clinically relevant dose of MPH increased tonic glutamate levels in the SHR but not the WKY compared to vehicle controls. After chronic treatment, both the SHR and WKY exhibited increased tonic glutamate levels; however, only the SHR was found to have decreased amplitudes of phasic glutamate signaling following chronic MPH administration. The findings from this study suggest that the MPH effects on extracellular glutamate levels in the SHR may potentiate the response for drug abuse later in life. Additionally, these data illuminate a pathway for investigating novel therapies for the treatment of ADHD and suggest that possibly targeting the group II metabotropic glutamate receptors may be a useful therapeutic avenue for adolescents diagnosed with ADHD.
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Affiliation(s)
- Erin M Miller
- Department of Neuroscience, Center for Microelectrode Technology, Brain Restoration Center, University of Kentucky Chandler Medical Center, MN206 Medical Science Bldg., 800 Rose Street, Lexington, KY, 40536-0298, USA
| | - Jorge E Quintero
- Department of Neuroscience, Center for Microelectrode Technology, Brain Restoration Center, University of Kentucky Chandler Medical Center, MN206 Medical Science Bldg., 800 Rose Street, Lexington, KY, 40536-0298, USA
| | - Francois Pomerleau
- Department of Neuroscience, Center for Microelectrode Technology, Brain Restoration Center, University of Kentucky Chandler Medical Center, MN206 Medical Science Bldg., 800 Rose Street, Lexington, KY, 40536-0298, USA
| | - Peter Huettl
- Department of Neuroscience, Center for Microelectrode Technology, Brain Restoration Center, University of Kentucky Chandler Medical Center, MN206 Medical Science Bldg., 800 Rose Street, Lexington, KY, 40536-0298, USA
| | - Greg A Gerhardt
- Department of Neuroscience, Center for Microelectrode Technology, Brain Restoration Center, University of Kentucky Chandler Medical Center, MN206 Medical Science Bldg., 800 Rose Street, Lexington, KY, 40536-0298, USA.
| | - Paul E A Glaser
- Department of Psychiatry, Washington University Medical School, St. Louis, MO, USA
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30
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Rostron CL, Gaeta V, Brace LR, Dommett EJ. Instrumental conditioning for food reinforcement in the spontaneously hypertensive rat model of attention deficit hyperactivity disorder. BMC Res Notes 2017; 10:525. [PMID: 29084583 PMCID: PMC5661932 DOI: 10.1186/s13104-017-2857-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 10/23/2017] [Indexed: 01/17/2023] Open
Abstract
Background The spontaneously hypertensive rat is thought to show good validity as a model of attention deficit hyperactivity disorder, in part because of impaired delayed reinforcement behaviour, corresponding to the dynamic developmental theory of the disorder. However, some previous studies may have been confounded use of fluid reward. Therefore, the objective of this study was to assess the spontaneously hypertensive rat and two comparison strains (Wistar and Wistar Kyoto) using a non-delayed food reinforcement paradigm in an attempt to advance knowledge of basic learnt behaviour in this strain, without potentially confounding reward sensitivity, which could impact on motivation to learn. Rats were trained on a fixed ratio 1 two choice discrimination schedule, extinction, reacquisition and reversal. We also tested non-reinforced spontaneous alternation to facilitate data interpretation. Results The spontaneously hypertensive rat displayed slower shaping and reduced on task activity during task acquisition, contrasting with previous results which indicate either enhanced responding and an impairment only when a delay is used; we suggest several reasons for this. In line with previous work, the same strain exhibited poor extinguishing of behaviour but were not impaired to the same extent on reversal of the discrimination. Finally, non-reinforced alternations on a Y-maze were also reduced in the spontaneously hypertensive rat. Conclusions In sum, the spontaneously hypertensive rat appear to show poor response inhibition in reinforced and non-reinforced contexts. However, impaired response inhibition was reduced during reversal when an opposite response produced food reward alongside presentation of the conditioned stimulus. We discuss the possibility of enhanced attribution of incentive salience to cues in this strain and highlight several points of caution for researchers conducting behavioural assessments using the spontaneously hypertensive rat and their associated comparison strains. Electronic supplementary material The online version of this article (10.1186/s13104-017-2857-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Claire L Rostron
- Dept Life, Health and Chemical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - Victoria Gaeta
- Dept Life, Health and Chemical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - Louise R Brace
- Dept Life, Health and Chemical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
| | - Eleanor J Dommett
- Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, Addison House, Guy's Campus, London, SE1 1UL, UK.
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Aparicio CF, Hennigan PJ, Mulligan LJ, Alonso-Alvarez B. Spontaneously hypertensive (SHR) rats choose more impulsively than Wistar-Kyoto (WKY) rats on a delay discounting task. Behav Brain Res 2017; 364:480-493. [PMID: 28963043 DOI: 10.1016/j.bbr.2017.09.040] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 09/19/2017] [Accepted: 09/25/2017] [Indexed: 11/29/2022]
Abstract
Indications of Attention Deficit Hyperactivity Disorder (ADHD) in the spontaneously hypertensive rat (SHR) are not consistent across different tests of impulsivity, questioning the SHR's validity as a rodent model of ADHD. This study used a concurrent-chains procedure to examine possible differences in impulsive choice between SHRs and control-normotensive Wistar Kyoto (WKY) rats. The aim was to extend the generality of findings showing regularities between the hyperbolic-decay model and the generalized matching law fitting delay discounting data from nonhuman animals. The objectives were to: (1) examine differences in impulsive choice between SHRs and WKYs; (2) add evidence suggesting that the SHR is a suitable model of ADHD; (3) demonstrate that concurrent-chains procedures requiring locomotion detect differences in impulsive choice between SHRs and WKYs; (4) support the idea that impulsivity in nonhuman animals increases with training. The initial link used two non-independent random interval schedules arranging entries to the terminal links, where one fixed-time (FT) schedule delayed 1-food pellet and the other FT 4-food pellets. The FT delaying the former was kept constant at 0.1s and that delaying the latter changed after every 10 food deliveries, defining six delay components (0.1, 5, 10, 20, 40, and 80s) presented in random order each session. Results showed that the SHRs choose more impulsively than the WKYs, adding to the body of evidence suggesting that the SHR may be a suitable model of ADHD. Both models of choice fitted the impulsive choices of the SHRs and WKYs well; positive correlations between estimates of parameters k and s suggested compatibility between models of choice showing that impulsivity increases with training.
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Poirier GL, Huang W, Tam K, DiFranza JR, King JA. Evidence of Altered Brain Responses to Nicotine in an Animal Model of Attention Deficit/Hyperactivity Disorder. Nicotine Tob Res 2017; 19:1016-1023. [PMID: 28444321 DOI: 10.1093/ntr/ntx088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 04/18/2017] [Indexed: 11/14/2022]
Abstract
Introduction Individuals with attention deficit/hyperactivity disorder (ADHD) are susceptible to earlier and more severe nicotine addiction. To shed light on the relationship between nicotine and ADHD, we examined nicotine's effects on functional brain networks in an animal model of ADHD. Methods Awake magnetic resonance imaging was used to compare functional connectivity in adolescent (post-natal day 44 ± 2) males of the spontaneously hypertensive rat (SHR) strain and two control strains, Wistar-Kyoto and Sprague-Dawley (n = 16 each). We analyzed functional connectivity immediately before and after nicotine exposure (0.4 mg/kg base) in naïve animals, using a region-of-interest approach focussing on 16 regions previously implicated in reward and addiction. Results Relative to the control groups, the SHR strain demonstrated increased functional connectivity between the ventral tegmental area (VTA) and retrosplenial cortex in response to nicotine, suggesting an aberrant response to nicotine. In contrast, increased VTA-substantia nigra connectivity in response to a saline injection in the SHR was absent following a nicotine injection, suggesting that nicotine normalized function in this circuit. Conclusions In the SHR, nicotine triggered an atypical response in one VTA circuit while normalizing activity in another. The VTA has been widely implicated in drug reward. Our data suggest that increased susceptibility to nicotine addiction in individuals with ADHD may involve altered responses to nicotine involving VTA circuits. Implications Nicotine addiction is more common among individuals with ADHD. We found that two circuits involving the VTA responded differently to nicotine in animals that model ADHD in comparison to two control strains. In one circuit, nicotine normalized activity that was abnormal in the ADHD animals, while in the other circuit nicotine caused an atypical brain response in the ADHD animals. The VTA has been implicated in drug reward. Our results would be consistent with an interpretation that nicotine may normalize abnormal brain activity in ADHD, and that nicotine may be more rewarding for individuals with ADHD.
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Affiliation(s)
- Guillaume L Poirier
- Center for Comparative NeuroImaging, Department of Psychiatry, University of Massachusetts Medical School,Worcester, MA
| | - Wei Huang
- Center for Comparative NeuroImaging, Department of Psychiatry, University of Massachusetts Medical School,Worcester, MA
| | - Kelly Tam
- Center for Comparative NeuroImaging, Department of Psychiatry, University of Massachusetts Medical School,Worcester, MA
| | - Joseph R DiFranza
- Center for Comparative NeuroImaging, Department of Psychiatry, University of Massachusetts Medical School, Worcester, MA.,Department of Family Medicine and Community Health, University of Massachusetts Medical School, Worcester, MA
| | - Jean A King
- Center for Comparative NeuroImaging, Department of Psychiatry, University of Massachusetts Medical School, Worcester, MA.,Department of Radiology, University of Massachusetts Medical School, Worcester, MA.,Department of Neurology, University of Massachusetts Medical School, Worcester, MA
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The Effect of Methylphenidate on the Microstructure of Schedule-Induced Polydipsia in an animal model of ADHD. Behav Brain Res 2017; 333:211-217. [PMID: 28669538 DOI: 10.1016/j.bbr.2017.06.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Revised: 06/23/2017] [Accepted: 06/29/2017] [Indexed: 01/15/2023]
Abstract
Schedule-induced polydipsia (SIP) was established in spontaneously hypertensive rats (SHR), Wistar Kyoto rats (WKY), and Wistar rats, using a multiple fixed-time (FT) schedule of food delivery, with 30- and 90-s components. Thereafter, animals were exposed to methylphenidate (MPH; 2.5mg/kg/d) for six consecutive SIP sessions. A test to assess possible sensitization effects was also conducted four days after termination of the drug treatment. At baseline, FT 90-s produced longer and more frequent drinking episodes in SHR than in WKY. An analysis of the distribution of inter-lick intervals revealed that drinking was organized in bouts, which were shorter in SHR than in WKY. Across strains and schedules, MPH shifted drinking episodes towards the beginning of inter-food intervals, which may reflect a stimulant effect on SIP. MPH transiently reduced the frequency of drinking episodes in WKY in FT 30-s, and more permanently reduced the frequency of licking bouts in Wistar rats. MPH also increased the length of licking bouts in Wistar rats. Overall, SHR displayed a hyperactive-like pattern of drinking (frequent but short bouts), which 2.5mg/kg MPH appears to reduce in WKY and Wistar but not in SHR rats. It appears that therapeutic effects of MPH on hyperactive-like SIP require higher doses in SHR relative to control strains.
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D'Souza D, Sadananda M. Estrous Cycle Phase-Dependent Changes in Anxiety- and Depression-Like Profiles in the Late Adolescent Wistar-Kyoto Rat. Ann Neurosci 2017; 24:136-145. [PMID: 28867895 DOI: 10.1159/000477151] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 02/23/2017] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Depression often manifests during adolescence when the development and networking of social and emotional brain areas is being influenced by hormones. The Wistar Kyoto (WKY) rat has been proposed as an animal model of adolescent depression with various face, construct, and predictive validities for clinical depression having been established. PURPOSE The influence of the estrous cycle on anxiety- and depression-like behaviors in female adolescents may be tested out further using this model. METHODS Female adolescent WKY rats were tested for anxiety- and depression-like behaviors in the elevated plus maze and forced swim test (FST) during different phases of the estrous cycle with inbred, age-, and phase-matched Wistar rats as controls. RESULTS Wistars in proestrus-estrus demonstrated reduced anxiety levels. WKY also demonstrated increased open arm time and entries and closed arm time, but less than Wistars, and as closed arm entries remained unaffected, it did not translate into a lowering of the anxiety levels. Risk taking and risk assessment behaviors were not affected by estrous phases in WKY, though exploratory behavior was reduced in proestrus-estrus. In Wistars, increased risk taking and decreased risk assessment behaviors were observed during proestrus-estrus. Increased immobility in the FST, indicative of learned helplessness was not influenced by phase in the WKY, which was at variance with Wistars that demonstrated phase-specific differences. CONCLUSION Results indicate a masking effect of indicative hormones in this putative model of adolescent depression, with implications for an unravelling of the steroid milieu in predisposed adolescent depression and for taking phase-specific time windows into account for therapeutic interventions.
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Affiliation(s)
- Deepthi D'Souza
- Brain Research Laboratory, Biotechnology Unit, Department of Biosciences, Mangalore University, Mangalagangothri, India
| | - Monika Sadananda
- Brain Research Laboratory, Biotechnology Unit, Department of Biosciences, Mangalore University, Mangalagangothri, India
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Fujiwara H, Tsushima R, Okada R, Awale S, Araki R, Yabe T, Matsumoto K. Sansoninto, a traditional herbal medicine, ameliorates behavioral abnormalities and down-regulation of early growth response-1 expression in mice exposed to social isolation stress. J Tradit Complement Med 2017; 8:81-88. [PMID: 29321993 PMCID: PMC5755994 DOI: 10.1016/j.jtcme.2017.03.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 02/09/2017] [Accepted: 03/02/2017] [Indexed: 12/02/2022] Open
Abstract
Social isolation (SI) mice exhibit behavioral abnormalities such as impairments of sociability- and attention-like behaviors, offering an animal model of neurodevelopmental disorders such as attention-deficit/hyperactivity disorder (ADHD). This study aimed to identify the effects of Sansoninto (SST; 酸棗仁湯 suān zǎo rén tāng) on the psychiatric symptoms related to ADHD using SI mice. Four-week-old mice were socially isolated during the experimental period, and SST administration (800 or 2400 mg/kg, p.o.) was started at 2 weeks after starting SI. SST ameliorated SI-induced impairments of sociability- and attention-like behaviors in a dose-dependent manner, and tended to ameliorate contextual- and auditory-dependent fear memory deficit. Moreover, the expression level of Egr-1 was down-regulated by SI stress, and was restored by a high dose of SST. These findings suggest that SST is useful for improvement of psychiatric disorders such as ADHD.
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Affiliation(s)
- Hironori Fujiwara
- Division of Medicinal Pharmacology, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Ryohei Tsushima
- Division of Medicinal Pharmacology, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Ryo Okada
- Division of Medicinal Pharmacology, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Suresh Awale
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
| | - Ryota Araki
- Laboratory of Functional Biomolecules and Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata City, Osaka, 573-0101, Japan
| | - Takeshi Yabe
- Laboratory of Functional Biomolecules and Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Setsunan University, 45-1 Nagaotoge-cho, Hirakata City, Osaka, 573-0101, Japan
| | - Kinzo Matsumoto
- Division of Medicinal Pharmacology, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan
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Fox AE, Caramia SR, Haskell MM, Ramey AL, Singha D. Stimulus control in two rodent models of attention-deficit/hyperactivity disorder. Behav Processes 2017; 135:16-24. [DOI: 10.1016/j.beproc.2016.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 11/10/2016] [Accepted: 11/14/2016] [Indexed: 12/16/2022]
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Majdak P, Ossyra JR, Ossyra JM, Cobert AJ, Hofmann GC, Tse S, Panozzo B, Grogan EL, Sorokina A, Rhodes JS. A new mouse model of ADHD for medication development. Sci Rep 2016; 6:39472. [PMID: 27996970 PMCID: PMC5171883 DOI: 10.1038/srep39472] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 11/21/2016] [Indexed: 11/12/2022] Open
Abstract
ADHD is a major societal problem with increasing incidence and a stagnant track record for treatment advances. A lack of appropriate animal models has partly contributed to the incremental advance of this field. Hence, our goal was to generate a novel mouse model that could be useful for ADHD medication development. We reasoned that hyperactivity is a core feature of ADHD that could easily be bred into a population, but to what extent other hallmark features of ADHD would appear as correlated responses was unknown. Hence, starting from a heterogeneous population, we applied within-family selection over 16 generations to produce a High-Active line, while simultaneously maintaining an unselected line to serve as the Control. We discovered that the High-Active line demonstrated motor impulsivity in two different versions of the Go/No-go test, which was ameliorated with a low dose of amphetamine, and further displayed hypoactivation of the prefrontal cortex and dysregulated cerebellar vermal activation as indexed by c-Fos immunohistochemical staining. We conclude that the High-Active line represents a valid model for the Hyperactive-Impulsive subtype of ADHD and therefore may be used in future studies to advance our understanding of the etiology of ADHD and screen novel compounds for its treatment.
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Affiliation(s)
- Petra Majdak
- The Neuroscience Program, University of Illinois, IL, USA.,The Beckman Institute for Advanced Science and Technology, University of Illinois, IL, USA
| | - John R Ossyra
- Oak Ridge National Laboratory, University of Tennessee, Knoxville, TN, USA
| | - Jessica M Ossyra
- College of Engineering, University of Tennessee, Knoxville, TN, USA
| | - Adam J Cobert
- Department of Food Science and Technology, University of California, Davis, CA, USA
| | | | - Stephen Tse
- The Beckman Institute for Advanced Science and Technology, University of Illinois, IL, USA
| | - Brent Panozzo
- The Beckman Institute for Advanced Science and Technology, University of Illinois, IL, USA
| | - Elizabeth L Grogan
- The Beckman Institute for Advanced Science and Technology, University of Illinois, IL, USA
| | - Anastassia Sorokina
- The Beckman Institute for Advanced Science and Technology, University of Illinois, IL, USA
| | - Justin S Rhodes
- The Neuroscience Program, University of Illinois, IL, USA.,The Beckman Institute for Advanced Science and Technology, University of Illinois, IL, USA.,Department of Psychology, University of Illinois, IL, USA
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38
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Fasmer OB, Johansen EB. Patterns of motor activity in spontaneously hypertensive rats compared to Wistar Kyoto rats. Behav Brain Funct 2016; 12:32. [PMID: 27906019 PMCID: PMC5131462 DOI: 10.1186/s12993-016-0117-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Accepted: 11/22/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Increased motor activity is a defining characteristic of patients with ADHD, and spontaneously hypertensive rats have been suggested to be an animal model of this disorder. In the present study, we wanted to use linear and non-linear methods to explore differences in motor activity patterns in SHR/NCrl rats compared to Wistar Kyoto (WKY/NHsd) rats. METHODS A total number of 42 rats (23 SHR/NCrl and 19 WKY/NHsd, male and female) were tested. At PND 51, the animals' movements were video-recorded during an operant test procedure that lasted 90 min. Total activity level and velocity (mean and maximum), standard deviation (SD) and root mean square successive differences (RMSSD) were calculated. In addition, we used Fourier analysis, autocorrelations and two measures of complexity to characterize the time series; sample entropy and symbolic dynamics. RESULTS The SHR/NCrl rats showed increased total activity levels in addition to increased mean and maximum velocity of movements. The variability measures, SD and RMSSD, were markedly lower in the SHR/NCrl compared to the WKY/NHsd rats. At the same time, the SHR/NCrl rats displayed a higher complexity of the time series, particularly with regard to the total activity level as evidenced by analyses of sample entropy and symbolic dynamics. Autocorrelation analyses also showed differences between the two strains. In the Fourier analysis, the SHR/NCrl rats had an increased variance in the high frequency part of the spectrum, corresponding to the time period of 9-17 s. CONCLUSION The findings show that in addition to increased total activity and velocity of movement, the organization of behavior is different in SHR/NCrl relative to WKY/NHsd controls. Compared to controls, behavioral variability is reduced in SHR/NCrl at an aggregate level, and, concomitantly, more complex and unpredictable from moment-to-moment. These finding emphasize the importance of the measures and methods used when characterizing behavioral variability. If valid for ADHD, the results indicate that decreased behavioral variability can co-exist with increased behavioral complexity, thus representing a challenge to current theories of variability in ADHD.
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Affiliation(s)
- Ole Bernt Fasmer
- Department of Clinical Medicine, Section for Psychiatry, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway.,Division of Psychiatry, Haukeland University Hospital, Bergen, Norway.,K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, Bergen, Norway
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D'Souza D, Sadananda M. Anxiety- and depressive-like profiles during early- and mid-adolescence in the female Wistar Kyoto rat. Int J Dev Neurosci 2016; 56:18-26. [PMID: 27845188 DOI: 10.1016/j.ijdevneu.2016.11.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 10/14/2016] [Accepted: 11/10/2016] [Indexed: 01/12/2023] Open
Abstract
Approaches for the development of preclinical models of depression extensively use adult and male animals owing to the discrepancies arising out of the hormonal flux in adult females and adolescents during attainment of puberty. Thus the increased vulnerability of females towards clinical depression and anxiety-related disorders remains incompletely understood. Development of clinical models of depression in adolescent females is essential in order to evolve effective treatment strategies for adolescent depression. In the present study, we have examined the anxiety and depressive-like profiles in a putative animal model of childhood depression, the Wistar Kyoto (WKY) rat, during early adolescence (∼postnatal day 30) and mid-adolescence (∼postnatal day 40). Female adolescent WKY rats, tested on a series of behavioural tests modelling anxiety- and depressive-like behaviours with age-matched Wistars as controls, demonstrated marked differences during early adolescence in a strain- and age-specific manner. Anxiety indices were obtained from exposure to the elevated plus maze, where social communication vide 50-kHz ultrasonic vocalizations was also assessed, while immobility and other parameters in the forced swim test were screened for depressive-like profiles. Sucrose preference, used as a measure of anhedonia in animals, was lower in WKYs at both ages tested and decreased with age. Anxiety-related behaviours were prominent in WKY rats only during early adolescence. WKY female rats are anxious during early adolescence and exhibit anhedonia as a core symptom of depression during early- and mid-adolescence, thus indicating that inclusion of female animals in preclinical trials is essential and will contribute to gender-based approaches to diagnosis and treatment of adolescent depression in females.
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Affiliation(s)
- Deepthi D'Souza
- Brain Research Laboratory, Biotechnology Unit, Department of Biosciences, Mangalore University, Mangalagangothri 574 199, Karnataka, India
| | - Monika Sadananda
- Brain Research Laboratory, Biotechnology Unit, Department of Biosciences, Mangalore University, Mangalagangothri 574 199, Karnataka, India.
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40
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Watterson E, Spitzer A, Watterson LR, Brackney RJ, Zavala AR, Olive MF, Sanabria F. Nicotine-induced behavioral sensitization in an adult rat model of attention deficit/hyperactivity disorder (ADHD). Behav Brain Res 2016; 312:333-40. [PMID: 27363925 DOI: 10.1016/j.bbr.2016.06.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 06/23/2016] [Accepted: 06/26/2016] [Indexed: 12/23/2022]
Abstract
Attention deficit hyperactivity disorder (ADHD) is associated with increased risk of tobacco dependence. Nicotine, the main psychoactive component of tobacco, appears to be implicated in ADHD-related tobacco dependence. However, the behavioral responsiveness to nicotine of the prevalent animal model of ADHD, the spontaneously hypertensive rat (SHR), is currently underinvestigated. The present study examined the activational effects of acute and chronic nicotine on the behavior of adult male SHRs, relative to Wistar Kyoto (WKY) controls. Experiment 1 verified baseline strain differences in open-field locomotor activity. Experiment 2 tested for baseline strain differences in rotational behavior using a Rotorat apparatus. Adult SHR and WKY rats were then exposed to a 7-day regimen of 0.6mg/kg/d s.c. nicotine, or saline, prior to each assessment. A separate group of SHRs underwent similar training, but was pre-treated with mecamylamine, a cholinergic antagonist. Nicotine sensitization, context conditioning, and mecamylamine effects were then tested. Baseline strain differences were observed in open-field performance and in the number of full rotations in the Rotorat apparatus, but not in the number of 90° rotations or direction changes. In these latter measures, SHRs displayed weaker nicotine-induced rotational suppression than WKYs. Both strains expressed nicotine-induced sensitization of rotational activity, but evidence for strain differences in sensitization was ambiguous; context conditioning was not observed. Mecamylamine reversed the effects of nicotine on SHR performance. These findings are consistent with the hypothesis that a reduced aversion to nicotine (expressed in rats as robust locomotion) may facilitate smoking among adults with ADHD.
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Affiliation(s)
- Elizabeth Watterson
- Arizona State University, Department of Psychology, P.O. Box 871104, Tempe, AZ 85287, United States
| | - Alexander Spitzer
- Arizona State University, Department of Psychology, P.O. Box 871104, Tempe, AZ 85287, United States
| | - Lucas R Watterson
- Arizona State University, Department of Psychology, P.O. Box 871104, Tempe, AZ 85287, United States; Center for Substance Abuse Research Temple University School of Medicine, 3500N. Broad St., Medical Education and Research Bldg., 8th Floor, Philadelphia, PA 19140, United States
| | - Ryan J Brackney
- Arizona State University, Department of Psychology, P.O. Box 871104, Tempe, AZ 85287, United States
| | - Arturo R Zavala
- California State University, Long Beach, CA 90840, United States
| | - M Foster Olive
- Arizona State University, Department of Psychology, P.O. Box 871104, Tempe, AZ 85287, United States
| | - Federico Sanabria
- Arizona State University, Department of Psychology, P.O. Box 871104, Tempe, AZ 85287, United States.
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41
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Awake whole-brain functional connectivity alterations in the adolescent spontaneously hypertensive rat feature visual streams and striatal networks. Brain Struct Funct 2016; 222:1673-1683. [DOI: 10.1007/s00429-016-1301-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 09/01/2016] [Indexed: 01/08/2023]
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Peres FF, Levin R, Almeida V, Zuardi AW, Hallak JE, Crippa JA, Abilio VC. Cannabidiol, among Other Cannabinoid Drugs, Modulates Prepulse Inhibition of Startle in the SHR Animal Model: Implications for Schizophrenia Pharmacotherapy. Front Pharmacol 2016; 7:303. [PMID: 27667973 PMCID: PMC5016523 DOI: 10.3389/fphar.2016.00303] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 08/26/2016] [Indexed: 02/06/2023] Open
Abstract
Schizophrenia is a severe psychiatric disorder that involves positive, negative and cognitive symptoms. Prepulse inhibition of startle reflex (PPI) is a paradigm that assesses the sensorimotor gating functioning and is impaired in schizophrenia patients as well as in animal models of this disorder. Recent data point to the participation of the endocannabinoid system in the pathophysiology and pharmacotherapy of schizophrenia. Here, we focus on the effects of cannabinoid drugs on the PPI deficit of animal models of schizophrenia, with greater focus on the SHR (Spontaneously Hypertensive Rats) strain, and on the future prospects resulting from these findings.
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Affiliation(s)
- Fernanda F Peres
- Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil; Department of Pharmacology, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil
| | - Raquel Levin
- Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil; Department of Pharmacology, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil
| | - Valéria Almeida
- Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil; Department of Pharmacology, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil
| | - Antonio W Zuardi
- Department of Neuroscience and Behavior, University of São PauloRibeirão Preto, Brazil; National Institute for Translational Medicine (INCT-TM, CNPq)Ribeirão Preto, Brazil
| | - Jaime E Hallak
- Department of Neuroscience and Behavior, University of São PauloRibeirão Preto, Brazil; National Institute for Translational Medicine (INCT-TM, CNPq)Ribeirão Preto, Brazil
| | - José A Crippa
- Department of Neuroscience and Behavior, University of São PauloRibeirão Preto, Brazil; National Institute for Translational Medicine (INCT-TM, CNPq)Ribeirão Preto, Brazil
| | - Vanessa C Abilio
- Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil; Department of Pharmacology, Escola Paulista De Medicina, Federal University of São PauloSão Paulo, Brazil
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Homberg JR, Kyzar EJ, Nguyen M, Norton WH, Pittman J, Poudel MK, Gaikwad S, Nakamura S, Koshiba M, Yamanouchi H, Scattoni ML, Ullman JF, Diamond DM, Kaluyeva AA, Parker MO, Klimenko VM, Apryatin SA, Brown RE, Song C, Gainetdinov RR, Gottesman II, Kalueff AV. Understanding autism and other neurodevelopmental disorders through experimental translational neurobehavioral models. Neurosci Biobehav Rev 2016; 65:292-312. [DOI: 10.1016/j.neubiorev.2016.03.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 03/11/2016] [Accepted: 03/21/2016] [Indexed: 12/11/2022]
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Brace LR, Kraev I, Rostron CL, Stewart MG, Overton PG, Dommett EJ. Auditory responses in a rodent model of Attention Deficit Hyperactivity Disorder. Brain Res 2015; 1629:10-25. [PMID: 26453290 DOI: 10.1016/j.brainres.2015.09.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 09/28/2015] [Accepted: 09/29/2015] [Indexed: 01/30/2023]
Abstract
A central component of Attention Deficit Hyperactivity Disorder (ADHD) is increased distractibility in response to visual and auditory stimuli, which is linked to the superior colliculus (SC). Furthermore, there is now mounting evidence of altered collicular functioning in ADHD and it is proposed that a hyper-responsive SC could mediate symptoms of ADHD, including distractibility. In the present study we conducted a systematic characterisation of the intermediate and deep layers of the SC in the most commonly used and well-validated model of ADHD, the spontaneously hypertensive rat (SHR), building on prior work showing increased distractible behaviour in this strain using visual distractors. We examined collicular-dependent orienting behaviour, local field potential (LFP) and multiunit activity (MUA) in response to auditory stimuli in the anaesthetised rat, and morphological measures, in the SHR in comparison to the Wistar Kyoto (WKY) and Wistar (WIS). We found no evidence of increased distractibility in the behavioural data but suggest that this may arise due to cochlear hearing loss in the SHR. Furthermore, the electrophysiology data indicate that the SC in the SHR may still be hyper-responsive, normalising the amplitude of auditory responses that would otherwise be reduced due to the hearing impairment. The morphological measures of collicular volume, cell density and ratios did not indicate this potential hyper-responsiveness had a basis at the structural level examined. These findings have implications for future use of the SHR in auditory processing studies and may represent a limitation to the validity of this animal model.
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Affiliation(s)
- Louise R Brace
- Department of Life, Health and Chemical Sciences, The Open University, Milton Keynes MK7 6AA, UK
| | - Igor Kraev
- Department of Life, Health and Chemical Sciences, The Open University, Milton Keynes MK7 6AA, UK
| | - Claire L Rostron
- Department of Life, Health and Chemical Sciences, The Open University, Milton Keynes MK7 6AA, UK
| | - Michael G Stewart
- Department of Life, Health and Chemical Sciences, The Open University, Milton Keynes MK7 6AA, UK
| | - Paul G Overton
- Department of Psychology, University of Sheffield, Western Bank, Sheffield S10 2TN, UK
| | - Eleanor J Dommett
- Department of Life, Health and Chemical Sciences, The Open University, Milton Keynes MK7 6AA, UK; Department of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King׳s College London, London SE1 3QD, UK.
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Adolescent methylphenidate treatment differentially alters adult impulsivity and hyperactivity in the Spontaneously Hypertensive Rat model of ADHD. Pharmacol Biochem Behav 2015; 141:66-77. [PMID: 26657171 DOI: 10.1016/j.pbb.2015.12.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Revised: 09/30/2015] [Accepted: 12/01/2015] [Indexed: 12/30/2022]
Abstract
Impulsivity and hyperactivity are two facets of attention deficit/hyperactivity disorder (ADHD). Impulsivity is expressed as reduced response inhibition capacity, an executive control mechanism that prevents premature execution of an intermittently reinforced behavior. During methylphenidate treatment, impulsivity and hyperactivity are decreased in adolescents with ADHD, but there is little information concerning levels of impulsivity and hyperactivity in adulthood after adolescent methylphenidate treatment is discontinued. The current study evaluated impulsivity, hyperactivity as well as cocaine sensitization during adulthood after adolescent methylphenidate treatment was discontinued in the Spontaneously Hypertensive Rat (SHR) model of ADHD. Treatments consisted of oral methylphenidate (1.5mg/kg) or water vehicle provided Monday-Friday from postnatal days 28-55. During adulthood, impulsivity was measured in SHR and control strains (Wistar Kyoto and Wistar rats) using differential reinforcement of low rate (DRL) schedules. Locomotor activity and cocaine sensitization were measured using the open-field assay. Adult SHR exhibited decreased efficiency of reinforcement under the DRL30 schedule and greater levels of locomotor activity and cocaine sensitization compared to control strains. Compared to vehicle, methylphenidate treatment during adolescence reduced hyperactivity in adult SHR, maintained the lower efficiency of reinforcement, and increased burst responding under DRL30. Cocaine sensitization was not altered following adolescent methylphenidate in adult SHR. In conclusion, adolescent treatment with methylphenidate followed by discontinuation in adulthood had a positive benefit by reducing hyperactivity in adult SHR rats; however, increased burst responding under DRL compared to SHR given vehicle, i.e., elevated impulsivity, constituted an adverse consequence associated with increased risk for cocaine abuse liability.
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Diana MC, Santoro ML, Xavier G, Santos CM, Spindola LN, Moretti PN, Ota VK, Bressan RA, Abilio VC, Belangero SI. Low expression of Gria1 and Grin1 glutamate receptors in the nucleus accumbens of Spontaneously Hypertensive Rats (SHR). Psychiatry Res 2015; 229:690-4. [PMID: 26296755 DOI: 10.1016/j.psychres.2015.08.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 08/03/2015] [Accepted: 08/12/2015] [Indexed: 10/23/2022]
Abstract
The Spontaneously Hypertensive Rat (SHR) strain is a classical animal model for the study of essential hypertension. Recently, our group suggested that this strain could be a useful animal model for schizophrenia, which is a severe mental illness with involvement of glutamatergic system. The aim of this study is to investigate glutamatergic receptors (Gria1 and Grin1) and glycine transporter (Glyt1) gene expression in the prefrontal cortex (PFC) and nucleus accumbens (NAcc) of SHR animals. The effects in gene expression of a chronic treatment with antipsychotic drugs (risperidone, haloperidol and clozapine) were also analyzed. Animals were treated daily for 30 days, and euthanized for brain tissue collection. The expression pattern was evaluated by Real Time Reverse-Transcriptase (RT) PCR technique. In comparison to control rats, SHR animals present a lower expression of both NMDA (Grin1) and AMPA (Gria1) gene receptors in the NAcc. Antipsychotic treatments were not able to change gene expressions in any of the regions evaluated. These findings provide evidence for the role of glutamatergic changes in schizophrenia-like phenotype of the SHR strain.
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Affiliation(s)
- Mariana C Diana
- LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil; Department of Pharmacology, Universidade Federal de Sao Paulo (UNIFESP), Rua Pedro de Toledo 669, 5th floor, CEP 04039032, Brazil
| | - Marcos L Santoro
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de Sao Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitao da Cunha, 1º andar, CEP 04023-900 São Paulo, Brazil; LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil
| | - Gabriela Xavier
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de Sao Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitao da Cunha, 1º andar, CEP 04023-900 São Paulo, Brazil
| | - Camila Mauricio Santos
- LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil; Department of Pharmacology, Universidade Federal de Sao Paulo (UNIFESP), Rua Pedro de Toledo 669, 5th floor, CEP 04039032, Brazil
| | - Leticia N Spindola
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de Sao Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitao da Cunha, 1º andar, CEP 04023-900 São Paulo, Brazil; LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil
| | - Patrícia N Moretti
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de Sao Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitao da Cunha, 1º andar, CEP 04023-900 São Paulo, Brazil; LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil
| | - Vanessa K Ota
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de Sao Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitao da Cunha, 1º andar, CEP 04023-900 São Paulo, Brazil; LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil
| | - Rodrigo A Bressan
- LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil
| | - Vanessa C Abilio
- LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil; Department of Pharmacology, Universidade Federal de Sao Paulo (UNIFESP), Rua Pedro de Toledo 669, 5th floor, CEP 04039032, Brazil
| | - Sintia I Belangero
- Genetics Division, Department of Morphology and Genetics, Universidade Federal de Sao Paulo (UNIFESP), Rua Botucatu, 740, Edifício Leitao da Cunha, 1º andar, CEP 04023-900 São Paulo, Brazil; LiNC - Interdisciplinary Laboratory of Clinical Neurosciences, Department of Psychiatry, UNIFESP, Rua Pedro de Toledo, 669, 3º floor, CEP 05039-032 São Paulo, Brazil.
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Feja M, Lang M, Deppermann L, Yüksel A, Wischhof L. High levels of impulsivity in rats are not accompanied by sensorimotor gating deficits and locomotor hyperactivity. Behav Processes 2015; 121:13-20. [PMID: 26484709 DOI: 10.1016/j.beproc.2015.10.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 10/04/2015] [Accepted: 10/12/2015] [Indexed: 10/22/2022]
Abstract
High levels of impulsivity have been linked to a number of psychiatric disorders, including attention-deficit/hyperactivity disorder, drug abuse and schizophrenia. Additionally, schizophrenia patients commonly show deficits in another rather preattentive form of response inhibition, called sensorimotor gating. Given that higher-order functions, such as impulse control, are protected by early and preattentive processes, disturbed gating mechanisms may hamper more complex cognitive-executive functions. In the present study, we therefore tested whether high levels of impulsivity are accompanied by impaired sensorimotor gating in rats. High (HI) and low impulsive (LI) rats were identified based on the number of premature responses in the 5-choice serial reaction time task. Here, LI rats showed higher numbers of omission errors which may suggest attentional deficits while HI rats completed significantly less trials which could indicate a decrease in motivation. However, HI and LI rats did not differ in terms of impulsive decision-making in a delay-based decision-making T-maze task, prepulse inhibition of the acoustic startle response (a measure of sensorimotor gating mechanisms) or locomotor activity levels. Overall, our data indicate that high motor impulsivity is not a suitable predictor of deficient sensorimotor gating and is further not necessarily associated with attentional deficits and/or locomotor hyperactivity in rats.
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Affiliation(s)
- M Feja
- Institute of Pharmacology and Toxicology, School of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - M Lang
- Department of Neuropharmacology, Center for Cognitive Science, University of Bremen, Bremen, Germany
| | - L Deppermann
- Department of Neuropharmacology, Center for Cognitive Science, University of Bremen, Bremen, Germany
| | - A Yüksel
- Department of Neuropharmacology, Center for Cognitive Science, University of Bremen, Bremen, Germany
| | - L Wischhof
- Department of Neuropharmacology, Center for Cognitive Science, University of Bremen, Bremen, Germany.
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Gao Y, Heldt SA. Lack of neuronal nitric oxide synthase results in attention deficit hyperactivity disorder-like behaviors in mice. Behav Neurosci 2015; 129:50-61. [PMID: 25621792 DOI: 10.1037/bne0000031] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Nitric oxide (NO) is an important molecule for the proper development and function of the central nervous system. In this study, we investigated the behavioral alterations in the neuronal NO synthase knockout mice (NOS1 KO) with a deficient NO production mechanism in the brain, characterizing it as a potential rodent model for attention deficit hyperactivity disorder (ADHD). NOS1 KO exhibited higher locomotor activity than their wildtype counterparts in a novel environment, as measured by open field (OF) test. In a 2-way active avoidance paradigm (TWAA), we found sex-dependent effects, where male KO displayed deficits in avoidance and escape behavior, sustained higher incidences of shuttle crossings, and higher incidences of intertrial interval crossings, suggesting learning, and/or performance impairments. On the other hand, female KO demonstrated few deficits in TWAA. Molsidomine (MSD), a NO donor, rescued TWAA deficits in male KO when acutely administered before training. In a passive avoidance paradigm, KO of both sexes displayed significantly shorter step-through latencies after training. Further, abnormal spontaneous motor activity rhythms were found in the KO during the dark phase of the day, indicating dysregulation of rhythmic activities. These data indicate that NOS1 KO mimics certain ADHD-like behaviors and could potentially serve as a novel rodent model for ADHD.
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49
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Altered visual processing in a rodent model of Attention-Deficit Hyperactivity Disorder. Neuroscience 2015; 303:364-77. [DOI: 10.1016/j.neuroscience.2015.07.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 06/18/2015] [Accepted: 07/01/2015] [Indexed: 11/23/2022]
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D-amphetamine improves attention performance in adolescent Wistar, but not in SHR rats, in a two-choice visual discrimination task. Psychopharmacology (Berl) 2015; 232:3269-86. [PMID: 26037943 DOI: 10.1007/s00213-015-3974-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 05/24/2015] [Indexed: 01/30/2023]
Abstract
The validity of spontaneous hypertensive rat (SHR) as a model of attention deficit hyperactivity disorder (ADHD) has been explored by comparing SHR with Wistar rats in a test of attention, the two-choice visual discrimination task (2-CVDT). Animals were 4-5 weeks old during the training phase of the experiment and 6-7 weeks old during the testing phase in which they were tested with D-amphetamine, a stimulant drug used for the treatment of ADHD. As compared to Wistar, SHR showed a slightly better attention performance, a slightly lower impulsivity level, and a lower general activity during the training phase, but these differences disappeared or lessened thereafter, during the testing phase. D-amphetamine (0.5, 1 mg/kg) improved attention performance in Wistar, but not in SHR, and did not modify impulsivity and activity in the two strains. In conclusion, the present study did not demonstrate that SHR represents a valid model of ADHD, since it did not show face validity regarding the behavioral symptoms of ADHD and predictive validity regarding the effect of a compound used for the treatment of ADHD. On the other hand, this study showed that the 2-CVDT may represent a suitable tool for evaluating in adolescent Wistar rats the effect on attention of compounds intended for the treatment of ADHD.
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