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Cocker PJ, Tremblay M, Kaur S, Winstanley CA. Chronic administration of the dopamine D 2/3 agonist ropinirole invigorates performance of a rodent slot machine task, potentially indicative of less distractible or compulsive-like gambling behaviour. Psychopharmacology (Berl) 2017; 234:137-153. [PMID: 27714426 DOI: 10.1007/s00213-016-4447-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 09/19/2016] [Indexed: 01/11/2023]
Abstract
RATIONALE Whilst dopamine agonist therapies can successfully manage the symptoms of diseases such as Parkinson's disease (PD), fibromyalgia and restless leg syndrome, they can also cause impulse control and addiction disorders such as gambling disorder (GD). These compulsive behaviours seriously undermine the utility of such treatments. OBJECTIVES The objective of the study was to model this phenomenon using a rodent slot machine task (rSMT) in order to investigate the neurobiological basis underlying such behavioural changes. METHODS Male Long Evans rats were trained to perform the rSMT. The D2-like agonist ropinirole, or saline, was then delivered continuously for 28 days via osmotic mini-pump. The effects of ropinirole on baseline rSMT performance, as well as extinction and reinstatement sessions, were determined during this time. Brain samples from key frontostriatal regions implicated in GD and PD were then harvested immediately or after a 4-week washout period during which behaviour returned to pre-drug baseline. RESULTS Ropinirole invigorated task performance, in that drug treatment resulted in a robust and sustained increase in the number of trials completed. Ex vivo analyses revealed that chronic ropinirole treatment led to a pattern of changes indicative of upregulation within the β-arrestin-AKT-GSK3β intracellular cascade, recently theorised to dominate D2-mediated signalling under hyperdopaminergic conditions, in the dorsal striatum, rather than the canonical PKA-dependent signalling pathway associated with D2 receptor activation. CONCLUSIONS Such findings provide novel insight into the role of dopamine signalling in mediating compulsive-like gambling behaviour and may inform more directed pharmacotherapies for the treatment of both idiopathic and iatrogenic GD.
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Affiliation(s)
- Paul J Cocker
- Department of Psychology, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada.
| | - M Tremblay
- Department of Psychology, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - S Kaur
- Department of Psychology, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Catharine A Winstanley
- Department of Psychology, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, 2215 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada.
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202
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Perseveration in a spatial-discrimination serial reversal learning task is differentially affected by MAO-A and MAO-B inhibition and associated with reduced anxiety and peripheral serotonin levels. Psychopharmacology (Berl) 2017; 234:1557-1571. [PMID: 28251298 PMCID: PMC5420387 DOI: 10.1007/s00213-017-4569-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Accepted: 02/15/2017] [Indexed: 01/12/2023]
Abstract
RATIONALE Impairments in behavioral flexibility lie at the core of anxiety and obsessive-compulsive disorders. Few studies, however, have investigated the neural substrates of natural variation in behavioral flexibility and whether inflexible behavior is linked to anxiety and peripheral markers of stress and monoamine function. OBJECTIVE The objective of the study was to investigate peripheral and central markers associated with perseverative behavior on a spatial-discrimination serial reversal learning task. METHODS Rats were trained on a reversal learning task prior to blood sampling, anxiety assessment, and the behavioral evaluation of selective monoamine oxidase-A (MAO-A) and MAO-B inhibitors, which block the degradation of serotonin (5-HT), dopamine (DA), and noradrenaline (NA). RESULTS Perseveration correlated positively with 5-HT levels in blood plasma and inversely with trait anxiety, as measured on the elevated plus maze. No significant relationships were found between perseveration and the stress hormone corticosterone or the 5-HT precursor tryptophan. Reversal learning was significantly improved by systemic administration of the MAO-A inhibitor moclobemide but not by the MAO-B inhibitor lazabemide. Moclobemide also increased latencies to initiate a new trial following an incorrect response suggesting a possible role in modulating behavioral inhibition to negative feedback. MAO-A but not MAO-B inhibition resulted in pronounced increases in 5-HT and NA content in the orbitofrontal cortex and dorsal raphé nuclei and increased 5-HT and DA content in the basolateral amygdala and dorsomedial striatum. CONCLUSIONS These findings indicate that central and peripheral monoaminergic mechanisms underlie inter-individual variation in behavioral flexibility, which overlaps with trait anxiety and depends on functional MAO-A activity.
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203
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Liu JP, Li J, Lu Y, Wang L, Chen G. Impulse control disorder, lysosomal malfunction and ATP13A2 insufficiency in Parkinsonism. Clin Exp Pharmacol Physiol 2016; 44:172-179. [PMID: 27997702 DOI: 10.1111/1440-1681.12714] [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: 11/24/2016] [Revised: 12/14/2016] [Accepted: 12/15/2016] [Indexed: 12/27/2022]
Abstract
Lysosomal transport of cargos in neurons is essential for neuronal proteostasis, transmission and functional motors and behaviours. Lysosomal malfunction including storage disorders is involved in the pathogenesis of Parkinson's disease (PD). Given the unclear molecular mechanisms of diverse defects in PD phenotypes, especially behavioural deficits, this mini review explores the cellular contexts of PD impulse control disorders and the molecular aspects of lysosomal cross-membrane transports. Focuses are paid to trace metal involvements in α-synuclein assembly in Lewy bodies, the functions and molecular interactions of ATP13A2 as ATPase transporters in lysosomal membranes for cross-membrane trafficking and lysosomal homeostasis, and our current understandings of the neural circuits in ICD. Erroneously polarized distributions of cargos such as metals and lipids on each side of lysosomal membranes triggered by gene mutations and deregulated expression of ATP13A2 may thus instigate sensing protein structural changes such as aggregations, organelle degeneration, and specific neuronal ageing and death in Parkinsonism.
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Affiliation(s)
- Jun-Ping Liu
- School of Medicine, Institute of Ageing Research, Hangzhou Normal University, Hangzhou, Zhejiang Province, China.,Department of Molecular and Translational Science, Faculty of Medicine, Hudson Institute of Medical Research, Monash University, Clayton, VIC, Australia.,Department of Immunology, Faculty of Medicine, Central Clinical School, Monash University, Prahran, VIC, Australia
| | - Jianfeng Li
- School of Medicine, Institute of Ageing Research, Hangzhou Normal University, Hangzhou, Zhejiang Province, China
| | - Yanhua Lu
- School of Medicine, Institute of Ageing Research, Hangzhou Normal University, Hangzhou, Zhejiang Province, China
| | - Lihui Wang
- School of Medicine, Institute of Ageing Research, Hangzhou Normal University, Hangzhou, Zhejiang Province, China
| | - Gang Chen
- School of Medicine, Institute of Ageing Research, Hangzhou Normal University, Hangzhou, Zhejiang Province, China
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204
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Trichotillomania as a Manifestation of Dementia. Case Rep Psychiatry 2016; 2016:9782702. [PMID: 27840761 PMCID: PMC5093278 DOI: 10.1155/2016/9782702] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 09/25/2016] [Accepted: 10/04/2016] [Indexed: 12/11/2022] Open
Abstract
Pathological hair-pulling or trichotillomania, which is commonly associated with anxiety and depression, obsessive-compulsive disorder, and neurodevelopmental disorders, has been rarely associated with dementing illnesses. Investigators have not clarified the neural correlates and treatment of trichotillomania in dementia. We report a patient who developed an early-onset cognitive decline with genetic, cerebrospinal fluid biomarker and structural and functional neuroimaging studies consistent with Alzheimer's disease. Eight years into her disease, she developed severe, repetitive hair-pulling behavior leading to marked hair loss, along with other repetitive and “frontal” behaviors. Selective serotonin reuptake inhibitors (SSRIs) were ineffective in controlling her hair-pulling behavior, which subsequently responded to quetiapine 150 mg/day. This patient and a review of the literature suggest that trichotillomania may be a compulsive-related symptom in dementias of different etiologies as they involve frontal areas and release primitive grooming behavior from frontostriatal dysfunction. Dopamine blockade, rather than SSRIs, may be effective in managing trichotillomania in dementia.
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205
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Coid JW, Ullrich S, Kallis C, Freestone M, Gonzalez R, Bui L, Igoumenou A, Constantinou A, Fenton N, Marsh W, Yang M, DeStavola B, Hu J, Shaw J, Doyle M, Archer-Power L, Davoren M, Osumili B, McCrone P, Barrett K, Hindle D, Bebbington P. Improving risk management for violence in mental health services: a multimethods approach. PROGRAMME GRANTS FOR APPLIED RESEARCH 2016. [DOI: 10.3310/pgfar04160] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BackgroundMental health professionals increasingly carry out risk assessments to prevent future violence by their patients. However, there are problems with accuracy and these assessments do not always translate into successful risk management.ObjectivesOur aim was to improve the accuracy of assessment and identify risk factors that are causal to be targeted by clinicians to ensure good risk management. Our objectives were to investigate key risks at the population level, construct new static and dynamic instruments, test validity and construct new models of risk management using Bayesian networks.Methods and resultsWe utilised existing data sets from two national and commissioned a survey to identify risk factors at the population level. We confirmed that certain mental health factors previously thought to convey risk were important in future assessments and excluded others from subsequent parts of the study. Using a first-episode psychosis cohort, we constructed a risk assessment instrument for men and women and showed important sex differences in pathways to violence. We included a 1-year follow-up of patients discharged from medium secure services and validated a previously developed risk assessment guide, the Medium Security Recidivism Assessment Guide (MSRAG). We found that it is essential to combine ratings from static instruments such as the MSRAG with dynamic risk factors. Static levels of risk have important modifying effects on dynamic risk factors for their effects on violence and we further demonstrated this using a sample of released prisoners to construct risk assessment instruments for violence, robbery, drugs and acquisitive convictions. We constructed a preliminary instrument including dynamic risk measures and validated this in a second large data set of released prisoners. Finally, we incorporated findings from the follow-up of psychiatric patients discharged from medium secure services and two samples of released prisoners to construct Bayesian models to guide clinicians in risk management.ConclusionsRisk factors for violence identified at the population level, including paranoid delusions and anxiety disorder, should be integrated in risk assessments together with established high-risk psychiatric morbidity such as substance misuse and antisocial personality disorder. The incorporation of dynamic factors resulted in improved accuracy, especially when combined in assessments using actuarial measures to obtain levels of risk using static factors. It is important to continue developing dynamic risk and protective measures with the aim of identifying factors that are causally related to violence. Only causal factors should be targeted in violence prevention interventions. Bayesian networks show considerable promise in developing software for clinicians to identify targets for intervention in the field. The Bayesian models developed in this programme are at the prototypical stage and require further programmer development into applications for use on tablets. These should be further tested in the field and then compared with structured professional judgement in a randomised controlled trial in terms of their effectiveness in preventing future violence.FundingThe National Institute for Health Research Programme Grants for Applied Research programme.
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Affiliation(s)
- Jeremy W Coid
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Simone Ullrich
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Constantinos Kallis
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Mark Freestone
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Rafael Gonzalez
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Laura Bui
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Artemis Igoumenou
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Anthony Constantinou
- School of Electronic Engineering and Computer Science, Risk and Information Management, Queen Mary University of London, London, UK
| | - Norman Fenton
- School of Electronic Engineering and Computer Science, Risk and Information Management, Queen Mary University of London, London, UK
| | - William Marsh
- School of Electronic Engineering and Computer Science, Risk and Information Management, Queen Mary University of London, London, UK
| | - Min Yang
- West China Research Centre for Rural Health Development, Sichuan University, Chengdu, China
| | - Bianca DeStavola
- Centre for Statistical Methodology, London School of Hygiene and Tropical Medicine, London, UK
| | - Junmei Hu
- Basic and Forensic Medicine, Sichuan University, Chengdu, China
| | - Jenny Shaw
- Institute of Brain Behaviour and Mental Health, University of Manchester, Manchester, UK
| | - Mike Doyle
- Institute of Brain Behaviour and Mental Health, University of Manchester, Manchester, UK
| | - Laura Archer-Power
- Institute of Brain Behaviour and Mental Health, University of Manchester, Manchester, UK
| | - Mary Davoren
- Violence Prevention Research Unit, Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, UK
| | - Beatrice Osumili
- Health Services and Population Research, Institute of Psychiatry, King’s College London, UK
| | - Paul McCrone
- Health Services and Population Research, Institute of Psychiatry, King’s College London, UK
| | | | | | - Paul Bebbington
- Department of Mental Health Sciences, University College London, London, UK
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206
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Sahmelikoglu Onur O, Tabo A, Aydin E, Tuna O, Maner AF, Yildirim EA, Çarpar E. Relationship between impulsivity and obsession types in obsessive-compulsive disorder. Int J Psychiatry Clin Pract 2016; 20:218-23. [PMID: 27654401 DOI: 10.1080/13651501.2016.1220580] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Impulsivity is an important aspect of obsessive-compulsive disorder (OCD) which is classified under a new heading in DSM-5 with other impulsivity related disorders like trichotillomania. Due to its heterogeneous nature, different obsessions may be linked to varying impulsivity profiles. Aim of this study was to investigate the impulsivity traits and their relationship with obsession types by comparing OCD subjects who display sexual, religious and aggressive obsessions or other obsessions to healthy controls. METHODS Outpatients with OCD (n = 146) and healthy controls (n = 80) were evaluated with Sociodemographic Data Form, SCID-I, SCID non-patient version, Yale-Brown Obsessive Compulsive Scale (Y-BOCS) and Barratt Impulsiveness Scale (BIS-11). RESULTS BIS-11 attention scores of the OCD group were significantly higher than healthy subjects. In patients with sexual, aggressive, religious obsessions, BIS-11 attention scores were significantly higher than those who have other obsession types and that of controls. CONCLUSIONS Higher levels of attentional impulsivity, particularly in patients suffering from sexual, aggressive or religious obsessions suggest a common diathesis for a dysfunction in neural correlates corresponding to these symptoms. The results of our study may promote further studies conducted with more advanced and objective neuropsychometric tests evaluating features of the clinical course, neurobiology and the response to OCD treatment.
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Affiliation(s)
- Ozge Sahmelikoglu Onur
- a Psychiatry Department , Bakirkoy Research and Training Hospital for Psychiatry Neurology and Neurosurgery , İstanbul , Turkey
| | - Abdulkadir Tabo
- a Psychiatry Department , Bakirkoy Research and Training Hospital for Psychiatry Neurology and Neurosurgery , İstanbul , Turkey
| | - Erkan Aydin
- b Psychiatry Department , Bahçelievler State Hospital , İstanbul , Turkey
| | - Ozgecan Tuna
- c Psychiatry Department , Kanuni Sultan Suleyman Research and Training Hospital , İstanbul , Turkey
| | - Ayse Fulya Maner
- a Psychiatry Department , Bakirkoy Research and Training Hospital for Psychiatry Neurology and Neurosurgery , İstanbul , Turkey
| | - Ejder Akgun Yildirim
- a Psychiatry Department , Bakirkoy Research and Training Hospital for Psychiatry Neurology and Neurosurgery , İstanbul , Turkey
| | - Elif Çarpar
- a Psychiatry Department , Bakirkoy Research and Training Hospital for Psychiatry Neurology and Neurosurgery , İstanbul , Turkey
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207
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Paholpak P, Carr AR, Barsuglia JP, Barrows RJ, Jimenez E, Lee GJ, Mendez MF. Person-Based Versus Generalized Impulsivity Disinhibition in Frontotemporal Dementia and Alzheimer Disease. J Geriatr Psychiatry Neurol 2016; 29:344-351. [PMID: 27647788 DOI: 10.1177/0891988716666377] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND While much disinhibition in dementia results from generalized impulsivity, in behavioral variant frontotemporal dementia (bvFTD) disinhibition may also result from impaired social cognition. OBJECTIVE To deconstruct disinhibition and its neural correlates in bvFTD vs. early-onset Alzheimer's disease (eAD). METHODS Caregivers of 16 bvFTD and 21 matched-eAD patients completed the Frontal Systems Behavior Scale disinhibition items. The disinhibition items were further categorized into (1) "person-based" subscale which predominantly associated with violating social propriety and personal boundary and (2) "generalized-impulsivity" subscale which included nonspecific impulsive acts. Subscale scores were correlated with grey matter volumes from tensor-based morphometry on magnetic resonance images. RESULTS In comparison to the eAD patients, the bvFTD patients developed greater person-based disinhibition ( P < 0.001) but comparable generalized impulsivity. Severity of person-based disinhibition significantly correlated with the left anterior superior temporal sulcus (STS), and generalized-impulsivity correlated with the right orbitofrontal cortex (OFC) and the left anterior temporal lobe (aTL). CONCLUSIONS Person-based disinhibition was predominant in bvFTD and correlated with the left STS. In both dementia, violations of social propriety and personal boundaries involved fronto-parieto-temporal network of Theory of Mind, whereas nonspecific disinhibition involved the OFC and aTL.
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Affiliation(s)
- Pongsatorn Paholpak
- 1 Department of Neurology, David Geffen School of Medicine, University of California at Los Angeles, CA, USA.,2 Department of Psychiatry, Khon Kaen University, Khon Kaen, Thailand
| | - Andrew R Carr
- 1 Department of Neurology, David Geffen School of Medicine, University of California at Los Angeles, CA, USA.,3 Greater Los Angeles VA Healthcare System, West Los Angeles, CA, USA
| | | | - Robin J Barrows
- 1 Department of Neurology, David Geffen School of Medicine, University of California at Los Angeles, CA, USA.,3 Greater Los Angeles VA Healthcare System, West Los Angeles, CA, USA
| | - Elvira Jimenez
- 1 Department of Neurology, David Geffen School of Medicine, University of California at Los Angeles, CA, USA.,3 Greater Los Angeles VA Healthcare System, West Los Angeles, CA, USA.,4 Psychiatry & Biobehavioral Sciences, David Geffen School of Medicine, University of California at Los Angeles, CA, USA
| | - Grace J Lee
- 5 Department of Psychology, School of Behavioral Health, Loma Linda University, Loma Linda, CA, USA
| | - Mario F Mendez
- 1 Department of Neurology, David Geffen School of Medicine, University of California at Los Angeles, CA, USA.,3 Greater Los Angeles VA Healthcare System, West Los Angeles, CA, USA.,4 Psychiatry & Biobehavioral Sciences, David Geffen School of Medicine, University of California at Los Angeles, CA, USA
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208
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Godier LR, de Wit S, Pinto A, Steinglass JE, Greene AL, Scaife J, Gillan CM, Walsh BT, Simpson HB, Park RJ. An investigation of habit learning in Anorexia Nervosa. Psychiatry Res 2016; 244:214-22. [PMID: 27497292 PMCID: PMC5718042 DOI: 10.1016/j.psychres.2016.07.051] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 06/14/2016] [Accepted: 07/21/2016] [Indexed: 01/19/2023]
Abstract
Anorexia Nervosa (AN) is a disorder characterised by compulsive behaviour, such as self-starvation and excessive exercise, which develop in the pursuit of weight-loss. Recent theory suggests that once established, compulsive weight-loss behaviours in AN may become habitual. In two parallel studies, we measured whether individuals with AN showed a bias toward habits using two outcome-devaluation tasks. In Study 1, 23 women with AN (restrictive and binge/purge subtypes), and 18 healthy controls (HC) completed the slips-of-action paradigm, designed to assess reward-based habits. In Study 2, 13 women with restrictive AN, 14 women recovered from restrictive AN, and 17 female HC participants completed the slips-of-action paradigm, and an avoidance paradigm, designed to assess aversive habits. AN participants showed no deficit relative to HCs in the ability to use feedback to respond correctly to stimuli. Following devaluation of outcomes, all groups in both studies were equally able to withhold inappropriate responses, suggesting no deficit in the balance between goal-directed and habitual control of behaviour in these tasks in AN. These results suggest that individuals with AN do not show a generalised tendency to rely on habits in two outcome-devaluation tasks. Future research is needed to investigate the potential role of disorder-specific habits in the maintenance of behaviour in AN.
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Affiliation(s)
- Lauren R Godier
- Department of Psychiatry, University of Oxford, Oxford OX3 7JX, United Kingdom.
| | - Sanne de Wit
- Department of Clinical Psychology, University of Amsterdam, Weesperplein 4, 1018 XA Amsterdam, The Netherlands; Amsterdam Brain and Cognition, University of Amsterdam, Amsterdam, The Netherlands
| | - Anthony Pinto
- Division of Psychiatry Research, Zucker Hillside Hospital, North Shore-LIJ Health System, Glen Oaks, NY, USA; Department of Psychiatry, Hofstra North Shore - LIJ School of Medicine, Hempstead, NY, USA; Department of Psychiatry, Columbia University, New York, NY, USA
| | - Joanna E Steinglass
- Department of Psychiatry, Columbia University, New York, NY, USA; New York State Psychiatric Institute, New York, NY, USA
| | | | - Jessica Scaife
- Department of Psychiatry, University of Oxford, Oxford OX3 7JX, United Kingdom
| | - Claire M Gillan
- Department of Psychology, New York University, 6 Washington Place, New York, NY 10003, USA; Department of Psychology, University of Cambridge, Downing Site, Cambridge, CB2 3EB, United Kingdom
| | - B Timothy Walsh
- Department of Psychiatry, Columbia University, New York, NY, USA; New York State Psychiatric Institute, New York, NY, USA
| | - Helen-Blair Simpson
- Department of Psychiatry, Columbia University, New York, NY, USA; New York State Psychiatric Institute, New York, NY, USA
| | - Rebecca J Park
- Department of Psychiatry, University of Oxford, Oxford OX3 7JX, United Kingdom
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209
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Naaijen J, de Ruiter S, Zwiers MP, Glennon JC, Durston S, Lythgoe DJ, Williams SCR, Banaschewski T, Brandeis D, Franke B, Buitelaar JK. COMPULS: design of a multicenter phenotypic, cognitive, genetic, and magnetic resonance imaging study in children with compulsive syndromes. BMC Psychiatry 2016; 16:361. [PMID: 27782808 PMCID: PMC5080712 DOI: 10.1186/s12888-016-1072-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 10/14/2016] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Compulsivity, the closely linked trait impulsivity and addictive behaviour are associated with several neurodevelopmental disorders, including attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder (ASD), and obsessive compulsive disorder (OCD). All three disorders show impaired fronto-striatal functioning, which may be related to altered glutamatergic signalling. Genetic factors are also thought to play an important role in the aetiology of compulsivity-related disorders. METHODS The COMPULS study is a multi-center study designed to investigate the relationship between the traits compulsivity, impulsivity, and, to a lesser extent, addictive behaviour within and across the neurodevelopmental disorders ADHD, ASD, and OCD. This will be done at the phenotypic, cognitive, neural, and genetic level. In total, 240 participants will take part in COMPULS across four different sites in Europe. Data collection will include diagnostic interviews, behavioural questionnaires, cognitive measures, structural, functional and spectral neuroimaging, and genome-wide genetic information. DISCUSSION The COMPULS study will offer the unique opportunity to investigate several key aspects of compulsivity across a large cohort of ADHD, ASD and OCD patients.
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Affiliation(s)
- Jilly Naaijen
- Department of Cognitive Neuroscience, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Noord 10 (Huispost 126), 6525 EZ Nijmegen, The Netherlands
| | - Saskia de Ruiter
- Karakter child and adolescent psychiatry university center, Nijmegen, The Netherlands
| | - Marcel P. Zwiers
- Department of Cognitive Neuroscience, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Noord 10 (Huispost 126), 6525 EZ Nijmegen, The Netherlands
| | - Jeffrey C. Glennon
- Department of Cognitive Neuroscience, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Noord 10 (Huispost 126), 6525 EZ Nijmegen, The Netherlands
| | - Sarah Durston
- NICHE lab, department of psychiatry, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands
| | - David J. Lythgoe
- Department of Neuroimaging, King’s College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Steven C. R. Williams
- Department of Neuroimaging, King’s College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Tobias Banaschewski
- Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty, Mannheim/Heidelberg University, Mannheim, Germany
| | - Daniel Brandeis
- Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty, Mannheim/Heidelberg University, Mannheim, Germany
- Department of Child and Adolescent Psychiatry, University of Zurich, Zurich, Switzerland
- Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
- Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland
| | - Barbara Franke
- Departments of Human Genetics and Psychiatry, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jan K. Buitelaar
- Department of Cognitive Neuroscience, Donders Institute of Brain, Cognition and Behaviour, Radboud University Medical Center, Geert Grooteplein Noord 10 (Huispost 126), 6525 EZ Nijmegen, The Netherlands
- Karakter child and adolescent psychiatry university center, Nijmegen, The Netherlands
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210
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Leppink EW, Redden SA, Chamberlain SR, Grant JE. Cognitive flexibility correlates with gambling severity in young adults. J Psychiatr Res 2016; 81:9-15. [PMID: 27355427 PMCID: PMC5330432 DOI: 10.1016/j.jpsychires.2016.06.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 06/02/2016] [Accepted: 06/10/2016] [Indexed: 01/30/2023]
Abstract
Although gambling disorder (GD) is often characterized as a problem of impulsivity, compulsivity has recently been proposed as a potentially important feature of addictive disorders. The present analysis assessed the neurocognitive and clinical relationship between compulsivity on gambling behavior. A sample of 552 non-treatment seeking gamblers age 18-29 was recruited from the community for a study on gambling in young adults. Gambling severity levels included both casual and disordered gamblers. All participants completed the Intra/Extra-Dimensional Set Shift (IED) task, from which the total adjusted errors were correlated with gambling severity measures, and linear regression modeling was used to assess three error measures from the task. The present analysis found significant positive correlations between problems with cognitive flexibility and gambling severity (reflected by the number of DSM-5 criteria, gambling frequency, amount of money lost in the past year, and gambling urge/behavior severity). IED errors also showed a positive correlation with self-reported compulsive behavior scores. A significant correlation was also found between IED errors and non-planning impulsivity from the BIS. Linear regression models based on total IED errors, extra-dimensional (ED) shift errors, or pre-ED shift errors indicated that these factors accounted for a significant portion of the variance noted in several variables. These findings suggest that cognitive flexibility may be an important consideration in the assessment of gamblers. Results from correlational and linear regression analyses support this possibility, but the exact contributions of both impulsivity and cognitive flexibility remain entangled. Future studies will ideally be able to assess the longitudinal relationships between gambling, compulsivity, and impulsivity, helping to clarify the relative contributions of both impulsive and compulsive features.
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Affiliation(s)
- Eric W. Leppink
- University of Chicago, Department of Psychiatry & Behavioral
Neuroscience, 5841 S. Maryland Ave., MC3077, Chicago, IL 60637, USA,Corresponding author (E.W.
Leppink)
| | - Sarah A. Redden
- University of Chicago, Department of Psychiatry & Behavioral
Neuroscience, 5841 S. Maryland Ave., MC3077, Chicago, IL 60637, USA
| | - Samuel R. Chamberlain
- Department of Psychiatry, University of Cambridge, Herchel Smith
Building, Robinson Way, Cambridge, CB2 0SZ, UK,Cambridge and Peterborough NHS Foundation Trust (CPFT), Cambridge
Road, Fulbourne, Cambridge, CB21 5HH, UK
| | - Jon E. Grant
- University of Chicago, Department of Psychiatry & Behavioral
Neuroscience, 5841 S. Maryland Ave., MC3077, Chicago, IL 60637, USA
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Rodriguez-Romaguera J, Greenberg BD, Rasmussen SA, Quirk GJ. An Avoidance-Based Rodent Model of Exposure With Response Prevention Therapy for Obsessive-Compulsive Disorder. Biol Psychiatry 2016; 80:534-40. [PMID: 27086546 PMCID: PMC4988932 DOI: 10.1016/j.biopsych.2016.02.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 01/30/2016] [Accepted: 02/11/2016] [Indexed: 10/22/2022]
Abstract
BACKGROUND Obsessive-compulsive disorder is treated with exposure with response prevention (ERP) therapy, in which patients are repeatedly exposed to compulsive triggers but prevented from expressing their compulsions. Many compulsions are an attempt to avoid perceived dangers, and the intent of ERP is to extinguish compulsions. Patients failing ERP therapy are candidates for deep brain stimulation (DBS) of the ventral capsule/ventral striatum, which facilitates patients' response to ERP therapy. An animal model of ERP would be useful for understanding the neural mechanisms of extinction in obsessive-compulsive disorder. METHODS Using a platform-mediated signaled avoidance task, we developed a rodent model of ERP called extinction with response prevention (Ext-RP), in which avoidance-conditioned rats are given extinction trials while blocking access to the avoidance platform. Following 3 days of Ext-RP, rats were tested with the platform unblocked to evaluate persistent avoidance. We then assessed if pharmacologic inactivation of lateral orbitofrontal cortex (lOFC) or DBS of the ventral striatum reduced persistent avoidance. RESULTS Following Ext-RP training, most rats showed reduced avoidance at test (Ext-RP success), but a subset persisted in their avoidance (Ext-RP failure). Pharmacologic inactivation of lOFC eliminated persistent avoidance, as did DBS applied to the ventral striatum during Ext-RP. CONCLUSIONS DBS of ventral striatum has been previously shown to inhibit lOFC activity. Thus, activity in lOFC, which is known to be hyperactive in obsessive-compulsive disorder, may be responsible for impairing patients' response to ERP therapy.
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Affiliation(s)
- Jose Rodriguez-Romaguera
- Departments of Psychiatry and Anatomy & Neurobiology, University of Puerto Rico School of Medicine, San Juan, PR 00936
| | | | - Steven A. Rasmussen
- Department of Psychiatry and Human Behavior, Brown University, Providence, RI 02906
| | - Gregory J. Quirk
- Departments of Psychiatry and Anatomy & Neurobiology, University of Puerto Rico School of Medicine, San Juan, PR 00936
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Abstract
Background Grassi et al. (2015) collected data to examine impulsivity in individuals with obsessive-compulsive disorder (OCD) compared to nonpsychiatric controls. Their aim was to examine whether OCD may be fully captured by the behavioral addiction model, using the prototypical mechanism underlying drug addiction as their framework. Based on their findings, Grassi et al. concluded that OCD shares behavioral components with addictions, particularly behavioral impulsivity and risky decision making. Furthermore, the authors suggested that this model may be superior to the prevailing psychological model of OCD. Findings We argue that based on the nature of their data as well as the current dominant conceptualization of OCD in the literature, this conclusion is untenable. The authors inferred behavioral impulsivity, whereas their main finding was concerning cognitive impulsivity or difficulties in planning. Such items on the Barratt impulsiveness scale have been shown in other research to overpredict behavioral impulsive tendencies in OCD, where the nature of the condition involves doubting of action and a conservative estimate of how one's cognitions may impact behavior. Conclusions We conclude that similar to drug addiction, compulsive rituals in OCD may be governed by a negative reinforcement mechanism; the available data indicate that OCD does not share the two main components seen in addiction, namely, behavioral impulsivity and risky decision making.
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Affiliation(s)
- Amitai Abramovitch
- Texas State University, San Marcos, Texas, USA,Corresponding author: Amitai Abramovitch; Department of Psychology, Texas State University, San Marcos, Texas 78666, USA; Phone: +1 512 245 2526; Fax: +1 512 245 3153; E-mail:
| | - Dean McKay
- Fordham University, Bronx, New York, USA
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213
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Modulation of Irisin and Physical Activity on Executive Functions in Obesity and Morbid obesity. Sci Rep 2016; 6:30820. [PMID: 27476477 PMCID: PMC4967861 DOI: 10.1038/srep30820] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 07/06/2016] [Indexed: 02/08/2023] Open
Abstract
Whether the executive profile is different between obesity (OB) and morbid obesity (MO) remains unclear. Recent evidence suggests that physical activity (PA) can act as a cognitive enhancer. Irisin is a recently discovered hormone associated with some of the positive effects of PA. The objective of the study was to investigate the executive profile in OB and MO, and to explore the role of PA and irisin. 114 participants were included (21 OB, 44 MO and 49 healthy controls-HC) in the study and assessed with the Wisconsin Card Sorting Test, Stroop Color and Word Test, and Iowa Gambling Task. All participants were female, aged between 18 and 60 years. Results showed a similar dysfunctional profile on decision making in OB and MO compared with HC. Thus, no specific neuropsychological profiles between OB and MO can be clearly observed in our sample. However, a negative correlation was found between irisin and executive functioning. These results demonstrate a specific executive profile in OB and a relevant and negative modulation of irisin on executive functioning. Although irisin might be a promising target for the treatment of obesity, its effects on cognition might be considered when thinking about its therapeutic use.
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Bandelow B, Baldwin D, Abelli M, Altamura C, Dell'Osso B, Domschke K, Fineberg NA, Grünblatt E, Jarema M, Maron E, Nutt D, Pini S, Vaghi MM, Wichniak A, Zai G, Riederer P. Biological markers for anxiety disorders, OCD and PTSD - a consensus statement. Part I: Neuroimaging and genetics. World J Biol Psychiatry 2016; 17:321-65. [PMID: 27403679 DOI: 10.1080/15622975.2016.1181783] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVES Biomarkers are defined as anatomical, biochemical or physiological traits that are specific to certain disorders or syndromes. The objective of this paper is to summarise the current knowledge of biomarkers for anxiety disorders, obsessive-compulsive disorder (OCD) and post-traumatic stress disorder (PTSD). METHODS Findings in biomarker research were reviewed by a task force of international experts in the field, consisting of members of the World Federation of Societies for Biological Psychiatry Task Force on Biological Markers and of the European College of Neuropsychopharmacology Anxiety Disorders Research Network. RESULTS The present article (Part I) summarises findings on potential biomarkers in neuroimaging studies, including structural brain morphology, functional magnetic resonance imaging and techniques for measuring metabolic changes, including positron emission tomography and others. Furthermore, this review reports on the clinical and molecular genetic findings of family, twin, linkage, association and genome-wide association studies. Part II of the review focuses on neurochemistry, neurophysiology and neurocognition. CONCLUSIONS Although at present, none of the putative biomarkers is sufficient and specific as a diagnostic tool, an abundance of high-quality research has accumulated that will improve our understanding of the neurobiological causes of anxiety disorders, OCD and PTSD.
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Affiliation(s)
- Borwin Bandelow
- a Department of Psychiatry and Psychotherapy , University of Göttingen , Germany
| | - David Baldwin
- b Faculty of Medicine , University of Southampton , Southampton , UK
| | - Marianna Abelli
- c Department of Clinical and Experimental Medicine , Section of Psychiatry, University of Pisa , Italy
| | - Carlo Altamura
- d Department of Psychiatry , University of Milan; Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico , Milan , Italy
| | - Bernardo Dell'Osso
- d Department of Psychiatry , University of Milan; Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico , Milan , Italy
| | - Katharina Domschke
- e Department of Psychiatry, Psychosomatics and Psychotherapy , University of Wuerzburg , Germany
| | - Naomi A Fineberg
- f Hertfordshire Partnership University NHS Foundation Trust and University of Hertfordshire , Rosanne House, Parkway , Welwyn Garden City , UK
| | - Edna Grünblatt
- e Department of Psychiatry, Psychosomatics and Psychotherapy , University of Wuerzburg , Germany ;,g Neuroscience Center Zurich , University of Zurich and the ETH Zurich , Zürich , Switzerland ;,h Department of Child and Adolescent Psychiatry and Psychotherapy , Psychiatric Hospital, University of Zurich , Zürich , Switzerland ;,i Zurich Center for Integrative Human Physiology , University of Zurich , Switzerland
| | - Marek Jarema
- j Third Department of Psychiatry , Institute of Psychiatry and Neurology , Warszawa , Poland
| | - Eduard Maron
- k North Estonia Medical Centre, Department of Psychiatry , Tallinn , Estonia ;,l Department of Psychiatry , University of Tartu , Estonia ;,m Faculty of Medicine, Department of Medicine, Centre for Neuropsychopharmacology, Division of Brain Sciences , Imperial College London , UK
| | - David Nutt
- m Faculty of Medicine, Department of Medicine, Centre for Neuropsychopharmacology, Division of Brain Sciences , Imperial College London , UK
| | - Stefano Pini
- c Department of Clinical and Experimental Medicine , Section of Psychiatry, University of Pisa , Italy
| | - Matilde M Vaghi
- n Department of Psychology and Behavioural and Clinical Neuroscience Institute , University of Cambridge , UK
| | - Adam Wichniak
- j Third Department of Psychiatry , Institute of Psychiatry and Neurology , Warszawa , Poland
| | - Gwyneth Zai
- n Department of Psychology and Behavioural and Clinical Neuroscience Institute , University of Cambridge , UK ;,o Neurogenetics Section, Centre for Addiction & Mental Health , Toronto , Canada ;,p Frederick W. Thompson Anxiety Disorders Centre, Department of Psychiatry, Sunnybrook Health Sciences Centre , Toronto , Canada ;,q Institute of Medical Science and Department of Psychiatry, University of Toronto , Toronto , Canada
| | - Peter Riederer
- e Department of Psychiatry, Psychosomatics and Psychotherapy , University of Wuerzburg , Germany ;,g Neuroscience Center Zurich , University of Zurich and the ETH Zurich , Zürich , Switzerland ;,h Department of Child and Adolescent Psychiatry and Psychotherapy , Psychiatric Hospital, University of Zurich , Zürich , Switzerland
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Chronic methamphetamine self-administration disrupts cortical control of cognition. Neurosci Biobehav Rev 2016; 69:36-48. [PMID: 27450578 DOI: 10.1016/j.neubiorev.2016.07.020] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 07/18/2016] [Accepted: 07/19/2016] [Indexed: 11/22/2022]
Abstract
Methamphetamine (meth) is one of the most abused substances worldwide. Chronic use has been associated with repeated relapse episodes that may be exacerbated by cognitive impairments during drug abstinence. Growing evidence demonstrates that meth compromises prefrontal cortex activity, resulting in persisting attentional and memory impairments. After summarizing recent studies of meth-induced cognitive dysfunction using a translationally relevant model of self-administered meth, this review emphasizes the cortical brain changes contributing to cognitive dysregulation during abstinence. Finally, we propose the use of cognitive enhancers during abstinence that may promote a drug-free state by reversing cortical dysfunction linked with prolonged meth abuse.
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Granero R, Fernández-Aranda F, Mestre-Bach G, Steward T, Baño M, Del Pino-Gutiérrez A, Moragas L, Mallorquí-Bagué N, Aymamí N, Gómez-Peña M, Tárrega S, Menchón JM, Jiménez-Murcia S. Compulsive Buying Behavior: Clinical Comparison with Other Behavioral Addictions. Front Psychol 2016; 7:914. [PMID: 27378999 PMCID: PMC4908125 DOI: 10.3389/fpsyg.2016.00914] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 06/02/2016] [Indexed: 12/15/2022] Open
Abstract
Compulsive buying behavior (CBB) has been recognized as a prevalent mental health disorder, yet its categorization into classification systems remains unsettled. The objective of this study was to assess the sociodemographic and clinic variables related to the CBB phenotype compared to other behavioral addictions. Three thousand three hundred and twenty four treatment-seeking patients were classified in five groups: CBB, sexual addiction, Internet gaming disorder, Internet addiction, and gambling disorder. CBB was characterized by a higher proportion of women, higher levels of psychopathology, and higher levels in the personality traits of novelty seeking, harm avoidance, reward dependence, persistence, and cooperativeness compared to other behavioral addictions. Results outline the heterogeneity in the clinical profiles of patients diagnosed with different behavioral addiction subtypes and shed new light on the primary mechanisms of CBB.
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Affiliation(s)
- Roser Granero
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos IIIBarcelona, Spain; Departament de Psicobiologia i Metodologia de les Ciències de la Salut, Universitat Autònoma de BarcelonaBarcelona, Spain
| | - Fernando Fernández-Aranda
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos IIIBarcelona, Spain; Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELLBarcelona, Spain; Department of Clinical Sciences, Faculty of Medicine, University of BarcelonaBarcelona, Spain
| | - Gemma Mestre-Bach
- Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELL Barcelona, Spain
| | - Trevor Steward
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos IIIBarcelona, Spain; Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELLBarcelona, Spain
| | - Marta Baño
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos IIIBarcelona, Spain; Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELLBarcelona, Spain
| | - Amparo Del Pino-Gutiérrez
- Nursing Department of Mental Health, Public Health, Maternal and Child Health, Nursing School, University of Barcelona Barcelona, Spain
| | - Laura Moragas
- Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELL Barcelona, Spain
| | - Núria Mallorquí-Bagué
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos IIIBarcelona, Spain; Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELLBarcelona, Spain
| | - Neus Aymamí
- Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELL Barcelona, Spain
| | - Mónica Gómez-Peña
- Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELL Barcelona, Spain
| | - Salomé Tárrega
- Departament de Psicobiologia i Metodologia de les Ciències de la Salut, Universitat Autònoma de Barcelona Barcelona, Spain
| | - José M Menchón
- Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELLBarcelona, Spain; Department of Clinical Sciences, Faculty of Medicine, University of BarcelonaBarcelona, Spain; Ciber de Salud Mental (CIBERSAM), Instituto de Salud Carlos IIIBarcelona, Spain
| | - Susana Jiménez-Murcia
- Ciber Fisiopatología Obesidad y Nutrición (CIBERObn), Instituto de Salud Carlos IIIBarcelona, Spain; Pathological Gambling Unit, Department of Psychiatry, Bellvitge University Hospital-IDIBELLBarcelona, Spain; Department of Clinical Sciences, Faculty of Medicine, University of BarcelonaBarcelona, Spain
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Kerr DJ, Marsillo A, Guariglia SR, Budylin T, Sadek R, Menkes S, Chauhan A, Wen GY, McCloskey DP, Wieraszko A, Banerjee P. Aberrant hippocampal Atp8a1 levels are associated with altered synaptic strength, electrical activity, and autistic-like behavior. Biochim Biophys Acta Mol Basis Dis 2016; 1862:1755-65. [PMID: 27287255 DOI: 10.1016/j.bbadis.2016.06.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 05/06/2016] [Accepted: 06/05/2016] [Indexed: 12/18/2022]
Abstract
Type IV ATPases are putative aminophospholipid translocases (APLTs), more commonly known as flippases. A pronounced induction of the flippase Atp8a1 was observed in post-mortem tissue homogenates from the hippocampus and temporal lobe of juvenile autistic subjects compared to age-matched controls. In order to simulate the human data, C57BL/6 mice were allowed to develop after intra-hippocampal injection of recombinant lentivirus expressing Atp8a1 at the early developmental stage of postnatal day 6 (P6). Transmission electron microscopy (TEM) analysis of the lentivirus-Atp8a1 treated (Atp8a1+) mice in adulthood revealed fewer and weaker excitatory synapses in the hippocampal CA1 region compared to mice injected with empty virus. Significant inhibition of the Schaffer collateral pathway was observed in the Atp8a1+ mice in paired-pulse recording (PPR) at 20-ms inter-stimulus interval. In the three-chambered sociability test, the Atp8a1+ mice displayed no preference for an encaged stranger mouse over a novel object, which is a characteristic autistic-like behavior. In sharp contrast, Atp8a1 (-/-) mice displayed a preference for a stranger mouse over the novel object, which is characteristic of neurotypical mouse behavior. However, similar to the Atp8a1+ mice, the Atp8a1 (-/-) mice harbored fewer and weaker excitatory synapses in CA1 compared to wild-type controls, and displayed inhibition at 20-ms inter-stimulus interval in PPR. These findings suggest that both elevated and diminished levels of Atp8a1 during early development are detrimental to brain connectivity, but only elevated Atp8a1 is associated with aberrant social behavior. Mice with augmented levels of Atp8a1 may therefore serve as a potential model in autism research.
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Affiliation(s)
- Daniel J Kerr
- Doctoral Program in Biology (CUNY), The College of Staten Island (CUNY), Staten Island, NY 10314, United States
| | - Alexandra Marsillo
- Doctoral Program in Biology (CUNY), The College of Staten Island (CUNY), Staten Island, NY 10314, United States
| | - Sara R Guariglia
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, United States
| | - Tatyana Budylin
- Doctoral Program in Biology (CUNY), The College of Staten Island (CUNY), Staten Island, NY 10314, United States
| | - Rodina Sadek
- Center for Developmental Neuroscience, The College of Staten Island (CUNY), Staten Island, NY 10314, United States
| | - Silvia Menkes
- Center for Developmental Neuroscience, The College of Staten Island (CUNY), Staten Island, NY 10314, United States
| | - Abha Chauhan
- New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY 10314, United States
| | - Guang Y Wen
- Center for Developmental Neuroscience, The College of Staten Island (CUNY), Staten Island, NY 10314, United States; New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY 10314, United States
| | - Daniel P McCloskey
- Doctoral Program in Psychology, CUNY Graduate Center, New York, NY 10016, United States; Center for Developmental Neuroscience, The College of Staten Island (CUNY), Staten Island, NY 10314, United States
| | - Andrzej Wieraszko
- Department of Biology, The College of Staten Island (CUNY), Staten Island, NY 10314, United States; Center for Developmental Neuroscience, The College of Staten Island (CUNY), Staten Island, NY 10314, United States
| | - Probal Banerjee
- Doctoral Program in Biology (CUNY), The College of Staten Island (CUNY), Staten Island, NY 10314, United States; Department of Chemistry, The College of Staten Island (CUNY), Staten Island, NY 10314, United States; Center for Developmental Neuroscience, The College of Staten Island (CUNY), Staten Island, NY 10314, United States.
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219
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The cost and impact of compulsivity: A research perspective. Eur Neuropsychopharmacol 2016; 26:800-9. [PMID: 27235690 DOI: 10.1016/j.euroneuro.2016.02.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 12/13/2015] [Accepted: 02/05/2016] [Indexed: 11/20/2022]
Abstract
Compulsivity is the defining feature of various psychiatric disorders including Obsessive Compulsive Related Disorders (OCRDs), and other compulsive, impulsive, and addictive disorders. These disorders are disabling, chronic conditions with an early onset and high rates of comorbidity, misdiagnoses, and delay in treatment onset. Disorders of compulsivity are responsible for considerable socioeconomic burden to society. We review the costs and impacts of compulsivity. In order to facilitate earlier diagnosis and targeted treatments, we examine the overlapping mechanisms that underlie compulsivity. We reconceptualize psychiatric disorders based on core features of compulsivity, highlight challenges in harmonizing research in children and adults, describe newer research methodologies, and point to future directions that can impact the costs and impact of disorders of compulsivity.
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220
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Observing others stay or switch - How social prediction errors are integrated into reward reversal learning. Cognition 2016; 153:19-32. [PMID: 27128170 DOI: 10.1016/j.cognition.2016.04.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 02/12/2016] [Accepted: 04/17/2016] [Indexed: 11/23/2022]
Abstract
Reward properties of stimuli can undergo sudden changes, and the detection of these 'reversals' is often made difficult by the probabilistic nature of rewards/punishments. Here we tested whether and how humans use social information (someone else's choices) to overcome uncertainty during reversal learning. We show a substantial social influence during reversal learning, which was modulated by the type of observed behavior. Participants frequently followed observed conservative choices (no switches after punishment) made by the (fictitious) other player but ignored impulsive choices (switches), even though the experiment was set up so that both types of response behavior would be similarly beneficial/detrimental (Study 1). Computational modeling showed that participants integrated the observed choices as a 'social prediction error' instead of ignoring or blindly following the other player. Modeling also confirmed higher learning rates for 'conservative' versus 'impulsive' social prediction errors. Importantly, this 'conservative bias' was boosted by interpersonal similarity, which in conjunction with the lack of effects observed in a non-social control experiment (Study 2) confirmed its social nature. A third study suggested that relative weighting of observed impulsive responses increased with increased volatility (frequency of reversals). Finally, simulations showed that in the present paradigm integrating social and reward information was not necessarily more adaptive to maximize earnings than learning from reward alone. Moreover, integrating social information increased accuracy only when conservative and impulsive choices were weighted similarly during learning. These findings suggest that to guide decisions in choice contexts that involve reward reversals humans utilize social cues conforming with their preconceptions more strongly than cues conflicting with them, especially when the other is similar.
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221
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Peña-Oliver Y, Carvalho FM, Sanchez-Roige S, Quinlan EB, Jia T, Walker-Tilley T, Rulten SL, Pearl FMG, Banaschewski T, Barker GJ, Bokde ALW, Büchel C, Conrod PJ, Flor H, Gallinat J, Garavan H, Heinz A, Gowland P, Paillere Martinot ML, Paus T, Rietschel M, Robbins TW, Smolka MN, Schumann G, Stephens DN. Mouse and Human Genetic Analyses Associate Kalirin with Ventral Striatal Activation during Impulsivity and with Alcohol Misuse. Front Genet 2016; 7:52. [PMID: 27092175 PMCID: PMC4823271 DOI: 10.3389/fgene.2016.00052] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 03/21/2016] [Indexed: 01/06/2023] Open
Abstract
Impulsivity is associated with a spectrum of psychiatric disorders including drug addiction. To investigate genetic associations with impulsivity and initiation of drug taking, we took a two-step approach. First, we identified genes whose expression level in prefrontal cortex, striatum and accumbens were associated with impulsive behavior in the 5-choice serial reaction time task across 10 BXD recombinant inbred (BXD RI) mouse strains and their progenitor C57BL/6J and DBA2/J strains. Behavioral data were correlated with regional gene expression using GeneNetwork (www.genenetwork.org), to identify 44 genes whose probability of association with impulsivity exceeded a false discovery rate of < 0.05. We then interrogated the IMAGEN database of 1423 adolescents for potential associations of SNPs in human homologs of those genes identified in the mouse study, with brain activation during impulsive performance in the Monetary Incentive Delay task, and with novelty seeking scores from the Temperament and Character Inventory, as well as alcohol experience. There was a significant overall association between the human homologs of impulsivity-related genes and percentage of premature responses in the MID task and with fMRI BOLD-response in ventral striatum (VS) during reward anticipation. In contrast, no significant association was found between the polygenic scores and anterior cingulate cortex activation. Univariate association analyses revealed that the G allele (major) of the intronic SNP rs6438839 in the KALRN gene was significantly associated with increased VS activation. Additionally, the A-allele (minor) of KALRN intronic SNP rs4634050, belonging to the same haplotype block, was associated with increased frequency of binge drinking.
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Affiliation(s)
- Yolanda Peña-Oliver
- School of Psychology, University of SussexBrighton, UK; Department of Psychology, University of CambridgeCambridge, UK
| | - Fabiana M Carvalho
- Institute of Psychiatry, Psychology and Neurosciences, Kings CollegeLondon, UK; MRC Social, Genetic and Developmental Psychiatry CentreLondon, UK
| | | | - Erin B Quinlan
- Institute of Psychiatry, Psychology and Neurosciences, Kings CollegeLondon, UK; MRC Social, Genetic and Developmental Psychiatry CentreLondon, UK
| | - Tianye Jia
- Institute of Psychiatry, Psychology and Neurosciences, Kings CollegeLondon, UK; MRC Social, Genetic and Developmental Psychiatry CentreLondon, UK
| | - Tom Walker-Tilley
- Institute of Psychiatry, Psychology and Neurosciences, Kings CollegeLondon, UK; MRC Social, Genetic and Developmental Psychiatry CentreLondon, UK
| | - Stuart L Rulten
- Genome Damage and Stability Centre, University of Sussex Brighton, UK
| | | | - Tobias Banaschewski
- Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University Mannheim, Germany
| | - Gareth J Barker
- Institute of Psychiatry, Psychology and Neurosciences, Kings College London, UK
| | - Arun L W Bokde
- Institute of Neuroscience, Trinity College Dublin Dublin, Ireland
| | | | - Patricia J Conrod
- Institute of Psychiatry, Psychology and Neurosciences, Kings CollegeLondon, UK; MRC Social, Genetic and Developmental Psychiatry CentreLondon, UK
| | - Herta Flor
- Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University Mannheim, Germany
| | | | - Hugh Garavan
- Institute of Neuroscience, Trinity College DublinDublin, Ireland; Departments of Psychiatry and Psychology, University of VermontBurlington, VT, USA
| | - Andreas Heinz
- Department of Child and Adolescent Psychiatry, Psychosomatics, and Psychotherapy, Charité-Universitätsmedizin Berlin, Germany
| | - Penny Gowland
- School of Psychology, University of Nottingham Nottingham, UK
| | - Marie-Laure Paillere Martinot
- INSERM, UMR 1000, Research Unit Imaging and Psychiatry, IFR49, CEA, DSV, I2BM-Service Hospitalier Frédéric Joliot Orsay, France
| | - Tomáš Paus
- Rotman Research Institute, University of TorontoToronto, ON, Canada; Department of Psychology and Psychiatry, University of TorontoToronto, ON, Canada
| | - Marcella Rietschel
- Central Institute of Mental Health, Medical Faculty Mannheim/Heidelberg University Mannheim, Germany
| | | | - Michael N Smolka
- Department of Psychiatry and Psychotherapy, Technische Universität Dresden Dresden, Germany
| | - Gunter Schumann
- Institute of Psychiatry, Psychology and Neurosciences, Kings CollegeLondon, UK; MRC Social, Genetic and Developmental Psychiatry CentreLondon, UK
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Kunz M, Hennig J, Karmann AJ, Lautenbacher S. Relationship of 5-HTTLPR Polymorphism with Various Factors of Pain Processing: Subjective Experience, Motor Responsiveness and Catastrophizing. PLoS One 2016; 11:e0153089. [PMID: 27043930 PMCID: PMC4820275 DOI: 10.1371/journal.pone.0153089] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 03/23/2016] [Indexed: 11/19/2022] Open
Abstract
Although serotonin is known to play an important role in pain processing, the relationship between the polymorphism in 5-HTTLPR and pain processing is not well understood. To examine the relationship more comprehensively, various factors of pain processing having putative associations with 5-HT functioning were studied, namely the subjective pain experience (pain threshold, rating of experimental pain), catastrophizing about pain (Pain Catastrophizing Scale = PCS) and motor responsiveness (facial expression of pain). In 60 female and 67 male participants, heat pain stimuli were applied by a contact thermode to assess pain thresholds, supra-threshold ratings and a composite score of pain-relevant facial responses. Participants also completed the PCS and were grouped based on their 5-HTTLPR genotype (bi-allelic evaluation) into a group with s-allele carriers (ss, sl) and a second group without (ll). S-allele carriers proved to have lower pain thresholds and higher PCS scores. These two positive findings were unrelated to each other. No other difference between genotype groups became significant. In all analyses, “age” and “gender” were controlled for. In s-allele carriers the subjective pain experience and the tendency to catastrophize about pain was enhanced, suggesting that the s-allele might be a risk factor for the development and maintenance of pain. This risk factor seems to act via two independent routes, namely via the sensory processes of subjective pain experiences and via the booster effects of pain catastrophizing.
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Affiliation(s)
- Miriam Kunz
- Department of General Practice, Geriatrics Section, University Medical Center Groningen, Groningen, The Netherlands
- Physiological Psychology, Department of Psychology, University of Bamberg, Bamberg, Germany
- * E-mail:
| | - Jürgen Hennig
- Personality Psychology and Individual Differences, Department of Psychology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Anna J. Karmann
- Physiological Psychology, Department of Psychology, University of Bamberg, Bamberg, Germany
| | - Stefan Lautenbacher
- Physiological Psychology, Department of Psychology, University of Bamberg, Bamberg, Germany
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223
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Belin-Rauscent A, Daniel ML, Puaud M, Jupp B, Sawiak S, Howett D, McKenzie C, Caprioli D, Besson M, Robbins TW, Everitt BJ, Dalley JW, Belin D. From impulses to maladaptive actions: the insula is a neurobiological gate for the development of compulsive behavior. Mol Psychiatry 2016; 21:491-9. [PMID: 26370145 DOI: 10.1038/mp.2015.140] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 07/15/2015] [Accepted: 08/10/2015] [Indexed: 02/06/2023]
Abstract
Impulsivity is an endophenotype of vulnerability for compulsive behaviors. However, the neural mechanisms whereby impulsivity facilitates the development of compulsive disorders, such as addiction or obsessive compulsive disorder, remain unknown. We first investigated, in rats, anatomical and functional correlates of impulsivity in the anterior insular (AI) cortex by measuring both the thickness of, and cellular plasticity markers in, the AI with magnetic resonance imaging and in situ hybridization of the immediate early gene zif268, respectively. We then investigated the influence of bilateral AI cortex lesions on the high impulsivity trait, as measured in the five-choice serial reaction time task (5-CSRTT), and the associated propensity to develop compulsivity as measured by high drinking levels in a schedule-induced polydipsia procedure (SIP). We demonstrate that the AI cortex causally contributes to individual vulnerability to impulsive-compulsive behavior in rats. Motor impulsivity, as measured by premature responses in the 5-CSRTT, was shown to correlate with the thinness of the anterior region of the insular cortex, in which highly impulsive (HI) rats expressed lower zif268 mRNA levels. Lesions of AI reduced impulsive behavior in HI rats, which were also highly susceptible to develop compulsive behavior as measured in a SIP procedure. AI lesions also attenuated both the development and the expression of SIP. This study thus identifies the AI as a novel neural substrate of maladaptive impulse control mechanisms that may facilitate the development of compulsive disorders.
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Affiliation(s)
- A Belin-Rauscent
- Department of Pharmacology, University of Cambridge, Cambridge, UK.,Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK
| | - M-L Daniel
- Inserm CIC-1402, Université de Poitiers, Poitiers, France
| | - M Puaud
- Department of Pharmacology, University of Cambridge, Cambridge, UK.,Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK
| | - B Jupp
- Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK.,Department of Psychology, University of Cambridge, Cambridge, UK
| | - S Sawiak
- Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK
| | - D Howett
- Department of Pharmacology, University of Cambridge, Cambridge, UK
| | - C McKenzie
- Department of Pharmacology, University of Cambridge, Cambridge, UK
| | - D Caprioli
- Behavioral Neuroscience Branch, Intramural Research Program, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, USA
| | - M Besson
- Neurobiologie Intégrative des Systèmes Cholinergiques, Institut Pasteur, Paris, France
| | - T W Robbins
- Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK.,Department of Psychology, University of Cambridge, Cambridge, UK
| | - B J Everitt
- Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK.,Department of Psychology, University of Cambridge, Cambridge, UK
| | - J W Dalley
- Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK.,Department of Psychology, University of Cambridge, Cambridge, UK.,Department of Psychiatry, University of Cambridge, Cambridge, UK
| | - D Belin
- Department of Pharmacology, University of Cambridge, Cambridge, UK.,Behavioral and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK
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224
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Bottesi G, Ghisi M, Ouimet AJ, Tira MD, Sanavio E. Compulsivity and Impulsivity in Pathological Gambling: Does a Dimensional-Transdiagnostic Approach Add Clinical Utility to DSM-5 Classification? J Gambl Stud 2016; 31:825-47. [PMID: 24863627 DOI: 10.1007/s10899-014-9470-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Although the phenomenology of Pathological Gambling (PG) is clearly characterized by impulsive features, some of the Diagnostic and Statistical Manual of Mental Disorder (DSM-5) criteria for PG are similar to those of Obsessive Compulsive Disorder (OCD). Therefore, the compulsive-impulsive spectrum model may be a better (or complementary) fit with PG phenomenology. The present exploratory research was designed to further investigate the compulsive and impulsive features characterizing PG, by comparing PG individuals, alcohol dependents (ADs), OCD patients, and healthy controls (HCs) on both self-report and cognitive measures of compulsivity and impulsivity. A better understanding of the shared psychological and cognitive mechanisms underlying differently categorized compulsive and impulsive disorders may significantly impact on both clinical assessment and treatment strategies for PG patients. With respect to self-report measures, PG individuals reported more compulsive and impulsive features than did HCs. As regards motor inhibition ability indices, PG individuals and HCs performed similarly on the Go/No-go task and better than AD individuals and OCD patients. Results from the Iowa Gambling Task highlighted that PG, AD, and OCD participants performed worse than did HCs. An in-depth analysis of each group's learning profile revealed similar patterns of impairment between PG and AD individuals in decision-making processes. Current findings support the utility of adopting a dimensional-transdiagnostic approach to complement the DSM-5 classification when working with PG individuals in clinical practice. Indeed, clinicians are encouraged to assess both compulsivity and impulsivity to provide individualized case conceptualizations and treatment plans focusing on the specific phenomenological features characterizing each PG patient.
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Affiliation(s)
- Gioia Bottesi
- Department of General Psychology, University of Padova, Via Venezia, 8, 35131, Padua, Italy,
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225
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Häge A, Banaschewski T, Buitelaar JK, Dijkhuizen RM, Franke B, Lythgoe DJ, Mechler K, Williams SCR, Dittmann RW. Glutamatergic medication in the treatment of obsessive compulsive disorder (OCD) and autism spectrum disorder (ASD) - study protocol for a randomised controlled trial. Trials 2016; 17:141. [PMID: 26983548 PMCID: PMC4794817 DOI: 10.1186/s13063-016-1266-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 02/29/2016] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Compulsivity is a cross-disorder trait underlying phenotypically distinct psychiatric disorders that emerge in childhood or adolescence. Despite the effectiveness of serotonergic compounds in the treatment of obsessive-compulsive disorder, treatment-resistant symptoms remaining in 40 to 60 % of patients present a pressing clinical problem. There are currently no medications that effectively treat the core impairments of autism spectrum disorder. There is an urgent need for the development of conceptually novel pharmacological strategies. Agents targeting glutamate neurotransmission, such as memantine, represent promising candidates. This proof-of-concept clinical study will allow pilot-testing of memantine for both clinical effectiveness and tolerability/safety. Memantine is an N-methyl-D-aspartate receptor antagonist, approved for the treatment of Alzheimer's dementia in a number of countries. METHODS/DESIGN This 12-week study has an add-on, randomised, double-blind, placebo-controlled design of treatment with memantine, including an up-titration phase (forced flexible dose design, 5-15 mg/day), in patients aged 6-17 years and 9 months with obsessive-compulsive disorder or autism spectrum disorder. It is planned to include patients with obsessive-compulsive disorder (N = 50) or autism spectrum disorder (N = 50) across four centres in three European countries. Patients will be randomly assigned to memantine or placebo in a 1:1 ratio. Primary objectives are the investigation of the effectiveness of memantine in paediatric patients for improving symptoms of compulsivity (primary outcome measure: total score on the Children's Yale-Brown Obsessive-Compulsive Scale) and to explore its tolerability and safety. Secondary objectives are to explore the effects of memantine at the level of structure, function and biochemistry of the fronto-striatal circuits, and to collect blood for genetic analyses and biomarkers. Tertiary objectives are to explore the role of new candidate genes and pathways for compulsivity by linking genes to clinical phenotypes, response to treatment, neurocognitive test performance, and key structural and functional neuroimaging measures of the fronto-striatal circuits and to explore biomarkers/proteomics for compulsivity traits. DISCUSSION This study is part of the large, translational project TACTICS ( http://www.tactics-project.eu/ ) that is funded by the European Union and investigates the neural, genetic and molecular factors involved in the pathogenesis of compulsivity. Its results will provide clinically relevant solid information on potential new mechanisms and medication treatment in obsessive-compulsive and autism spectrum disorders. TRIAL REGISTRATION EudraCT Number: 2014-003080-38 , date of registration: 14 July 2014.
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Affiliation(s)
- Alexander Häge
- />Paediatric Psychopharmacology, Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, PO Box 12 21 20, 68072 Mannheim, Germany
| | - Tobias Banaschewski
- />Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Jan K. Buitelaar
- />Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Rick M. Dijkhuizen
- />Biomedical MR Imaging and Spectroscopy Group, Center for Image Sciences, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Barbara Franke
- />Departments of Human Genetics and Psychiatry, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
| | - David J. Lythgoe
- />Department of Neuroimaging, King’s College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Konstantin Mechler
- />Paediatric Psychopharmacology, Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, PO Box 12 21 20, 68072 Mannheim, Germany
| | - Steven C. R. Williams
- />Department of Neuroimaging, King’s College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Ralf W. Dittmann
- />Paediatric Psychopharmacology, Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, PO Box 12 21 20, 68072 Mannheim, Germany
| | - the TACTICS Consortium
- />Paediatric Psychopharmacology, Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, PO Box 12 21 20, 68072 Mannheim, Germany
- />Department of Child and Adolescent Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
- />Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
- />Biomedical MR Imaging and Spectroscopy Group, Center for Image Sciences, University Medical Center Utrecht, Utrecht, The Netherlands
- />Departments of Human Genetics and Psychiatry, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, The Netherlands
- />Department of Neuroimaging, King’s College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
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226
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Paula JJD, Costa DDS, Oliveira F, Alves JO, Passos LR, Malloy-Diniz LF. Impulsivity and compulsive buying are associated in a non-clinical sample: an evidence for the compulsivity-impulsivity continuum? ACTA ACUST UNITED AC 2016; 37:242-4. [PMID: 26376055 DOI: 10.1590/1516-4446-2014-1644] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
OBJECTIVE Compulsive buying is controversial in clinical psychiatry. Although it is defined as an obsessive-compulsive disorder, other personality aspects besides compulsivity are related to compulsive buying. Recent studies suggest that compulsivity and impulsivity might represent a continuum, with several psychiatric disorders lying between these two extremes. In this sense, and following the perspective of dimensional psychiatry, symptoms of impulsivity and compulsivity should correlate even in a non-clinical sample. The present study aims to investigate whether these two traits are associated in a healthy adult sample. METHODS We evaluated 100 adults, with no self-reported psychiatric disorders, using the Barratt Impulsiveness Scale-11 and two scales of compulsive buying. RESULTS Using multiple linear regressions, we found that impulsivity accounted for about 15% of variance in the compulsive-buying measure. CONCLUSIONS Our results suggest that an association between impulsivity and compulsive buying occurs even in non-clinical samples, evidence that compulsivity and impulsivity might form a continuum and that compulsive buying might be an intermediate condition between these two personality traits.
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Affiliation(s)
- Jonas J de Paula
- National Science and Technology Institute for Molecular Medicine, School of Medicine, Universidade Federal de Minas Gerais, Belo Horizonte, MG, BR
| | - Danielle de S Costa
- National Science and Technology Institute for Molecular Medicine, School of Medicine, Universidade Federal de Minas Gerais, Belo Horizonte, MG, BR
| | | | - Joana O Alves
- Faculdade de Ciências Médicas de Minas Gerais, Belo Horizonte, MG, BR
| | - Lídia R Passos
- Faculdade de Ciências Médicas de Minas Gerais, Belo Horizonte, MG, BR
| | - Leandro F Malloy-Diniz
- National Science and Technology Institute for Molecular Medicine, School of Medicine, Universidade Federal de Minas Gerais, Belo Horizonte, MG, BR
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227
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O'Dell LE, Nazarian A. Enhanced vulnerability to tobacco use in persons with diabetes: A behavioral and neurobiological framework. Prog Neuropsychopharmacol Biol Psychiatry 2016; 65:288-96. [PMID: 26092247 DOI: 10.1016/j.pnpbp.2015.06.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 05/15/2015] [Accepted: 06/08/2015] [Indexed: 11/18/2022]
Abstract
Tobacco use significantly magnifies the negative health complications associated with diabetes. Although tobacco use is strongly discouraged in persons with diabetes, clinical evidence suggests that they often continue to smoke and have more difficulty quitting despite serious contraindications. Here, we suggest that a potential reason for enhanced vulnerability to tobacco use in persons with diabetes is greater rewarding effects of nicotine. This review summarizes pre-clinical evidence indicating that the rewarding effects of nicotine are enhanced in rodent models of type 1 and type 2 diabetes. We also provide a framework of neurobiological mechanisms that are posited to promote tobacco use in persons with diabetes. This framework suggests that diabetes induces a disruption in insulin signaling that leads to a suppression of dopamine systems in the mesolimbic reward pathway. Lastly, we consider the clinical implications of enhanced rewarding effects of nicotine that may promote tobacco use in persons with diabetes. The clinical efficacy of smoking cessation medications that enhance dopamine are important to consider, given that persons with diabetes may display disrupted dopaminergic mechanisms. Future work is needed to better understand the complex interaction of dopamine and insulin in order to develop better smoking cessation medications for persons with diabetes.
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Affiliation(s)
- Laura E O'Dell
- Department of Psychology, University of Texas at El Paso, 500 West University Avenue, El Paso, TX 79968, USA
| | - Arbi Nazarian
- Department of Pharmaceutical Sciences, Western University of Health Sciences, 309 East Second Street, Pomona, CA 91766, USA.
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228
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Rajagopal L, Massey BW, Michael E, Meltzer HY. Serotonin (5-HT)1A receptor agonism and 5-HT7 receptor antagonism ameliorate the subchronic phencyclidine-induced deficit in executive functioning in mice. Psychopharmacology (Berl) 2016; 233:649-60. [PMID: 26558619 DOI: 10.1007/s00213-015-4137-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 10/27/2015] [Indexed: 02/07/2023]
Abstract
RATIONALE Reversal learning (RL), a type of executive function, dependent on prefrontal cortical function, is impaired in rodents by subchronic (sc) treatment with the N-methyl-D-aspartate receptor antagonist, phencyclidine (PCP), a widely studied model of cognitive impairment in schizophrenia (CIS). OBJECTIVE The principal objective of this study was to determine the ability of serotonin (5-HT)1A partial agonism and 5-HT7 receptor antagonism to improve RL in scPCP-treated mice. METHODS Male C57BL/6J mice were trained on an operant RL (ORL) task, then received PCP, 10 mg/kg, or saline, bid, for 7 days, followed by a 7-day washout period. RESULTS scPCP significantly diminished the percent correct responding, increased total incorrect trials, and total incorrect responses, in the reversal phase performance of the ORL task. Pre-treatment with the selective 5-HT1A partial agonist, tandospirone, or the selective 5-HT7 antagonist, SB269970, but not the 5-HT7 agonist, AS 19, reversed the scPCP-induced deficit in RL. Pre-treatment with atypical antipsychotic drug lurasidone, which is a 5-HT1A partial agonist and 5-HT7 antagonist, as well as a 5-HT2A and dopamine (D)2 antagonist, also reversed RL deficit in the scPCP-treated mice. Furthermore, the selective 5-HT1A antagonist, WAY100635, blocked the ability of lurasidone to reverse the scPCP-induced RL deficit. CONCLUSIONS These results indicate that 5-HT7 antagonism and 5-HT1A partial agonism contribute to restoration of RL in scPCP-treated mice. It is suggested that these two mechanisms are effective in restoring RL by decreasing excessive GABAergic inhibition of cortical pyramidal neurons following withdrawal of scPCP treatment.
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Affiliation(s)
- Lakshmi Rajagopal
- Department of Psychiatry and Behavioral Science, Northwestern University, Feinberg School of Medicine, 303E Chicago Ave, Ward Building 7-101, Chicago, IL, 60611, USA
| | - Bill W Massey
- Department of Psychiatry and Behavioral Science, Northwestern University, Feinberg School of Medicine, 303E Chicago Ave, Ward Building 7-101, Chicago, IL, 60611, USA
| | - Eric Michael
- Department of Psychiatry and Behavioral Science, Northwestern University, Feinberg School of Medicine, 303E Chicago Ave, Ward Building 7-101, Chicago, IL, 60611, USA
| | - Herbert Y Meltzer
- Department of Psychiatry and Behavioral Science, Northwestern University, Feinberg School of Medicine, 303E Chicago Ave, Ward Building 7-101, Chicago, IL, 60611, USA.
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229
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Mihov Y, Hasler G. Negative Allosteric Modulators of Metabotropic Glutamate Receptors Subtype 5 in Addiction: a Therapeutic Window. Int J Neuropsychopharmacol 2016; 19:pyw002. [PMID: 26802568 PMCID: PMC4966271 DOI: 10.1093/ijnp/pyw002] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 01/08/2016] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Abundant evidence at the anatomical, electrophysiological, and molecular levels implicates metabotropic glutamate receptor subtype 5 (mGluR5) in addiction. Consistently, the effects of a wide range of doses of different mGluR5 negative allosteric modulators (NAMs) have been tested in various animal models of addiction. Here, these studies were subjected to a systematic review to find out if mGluR5 NAMs have a therapeutic potential that can be translated to the clinic. METHODS Literature on consumption/self-administration and reinstatement of drug seeking as outcomes of interest published up to April 2015 was retrieved via PubMed. The review focused on the effects of systemic (i.p., i.v., s.c.) administration of the mGluR5 NAMs 3-((2-Methyl-4-thiazolyl)ethynyl)pyridine (MTEP) and 2-Methyl-6-(phenylethynyl)pyridine (MPEP) on paradigms with cocaine, ethanol, nicotine, and food in rats. RESULTS MTEP and MPEP were found to reduce self-administration of cocaine, ethanol, and nicotine at doses ≥1mg/kg and 2.5mg/kg, respectively. Dose-response relationship resembled a sigmoidal curve, with low doses not reaching statistical significance and high doses reliably inhibiting self-administration of drugs of abuse. Importantly, self-administration of cocaine, ethanol, and nicotine, but not food, was reduced by MTEP and MPEP in the dose range of 1 to 2mg/kg and 2.5 to 3.2mg/kg, respectively. This dose range corresponds to approximately 50% to 80% mGluR5 occupancy. Interestingly, the limited data found in mice and monkeys showed a similar therapeutic window. CONCLUSION Altogether, this review suggests a therapeutic window for mGluR5 NAMs that can be translated to the treatment of substance-related and addictive disorders.
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Affiliation(s)
- Yoan Mihov
- Division of Molecular Psychiatry, Translational Research Center, Psychiatric University Hospital, University of Bern, Switzerland
| | - Gregor Hasler
- Division of Molecular Psychiatry, Translational Research Center, Psychiatric University Hospital, University of Bern, Switzerland
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Brooks SJ. A debate on working memory and cognitive control: can we learn about the treatment of substance use disorders from the neural correlates of anorexia nervosa? BMC Psychiatry 2016; 16:10. [PMID: 26772802 PMCID: PMC4715338 DOI: 10.1186/s12888-016-0714-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 01/12/2016] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Anorexia Nervosa (AN) is a debilitating, sometimes fatal eating disorder (ED) whereby restraint of appetite and emotion is concomitant with an inflexible, attention-to-detail perfectionist cognitive style and obsessive-compulsive behaviour. Intriguingly, people with AN are less likely to engage in substance use, whereas those who suffer from an ED with a bingeing component are more vulnerable to substance use disorder (SUD). DISCUSSION This insight into a beneficial consequence of appetite control in those with AN, which is shrouded by the many other unhealthy, excessive and deficit symptoms, may provide some clues as to how the brain could be trained to exert better, sustained control over appetitive and impulsive processes. Structural and functional brain imaging studies implicate the executive control network (ECN) and the salience network (SN) in the neuropathology of AN and SUD. Additionally, excessive employment of working memory (WM), alongside more prominent cognitive deficits may be utilised to cope with the experience of negative emotions and may account for aberrant brain function. WM enables mental rehearsal of cognitive strategies while regulating, restricting or avoiding neural responses associated with the SN. Therefore, high versus low WM capacity may be one of the factors that unites common cognitive and behavioural symptoms in those suffering from AN and SUD respectively. Furthermore, emerging evidence suggests that by evoking neural plasticity in the ECN and SN with WM training, improvements in neurocognitive function and cognitive control can be achieved. Thus, considering the neurocognitive processes of excessive appetite control and how it links to WM in AN may aid the application of adjunctive treatment for SUD.
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Affiliation(s)
- Samantha J. Brooks
- UCT Department of Psychiatry and Mental Health, Groote Schuur Hospital, Anzio Road, Observatory Cape Town, South Africa
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231
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Zhang Q, Goto H, Akiyoshi-Nishimura S, Prosselkov P, Sano C, Matsukawa H, Yaguchi K, Nakashiba T, Itohara S. Diversification of behavior and postsynaptic properties by netrin-G presynaptic adhesion family proteins. Mol Brain 2016; 9:6. [PMID: 26746425 PMCID: PMC4706652 DOI: 10.1186/s13041-016-0187-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 01/04/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Vertebrate-specific neuronal genes are expected to play a critical role in the diversification and evolution of higher brain functions. Among them, the glycosylphosphatidylinositol (GPI)-anchored netrin-G subfamily members in the UNC6/netrin family are unique in their differential expression patterns in many neuronal circuits, and differential binding ability to their cognate homologous post-synaptic receptors. RESULTS To gain insight into the roles of these genes in higher brain functions, we performed comprehensive behavioral batteries using netrin-G knockout mice. We found that two netrin-G paralogs that recently diverged in evolution, netrin-G1 and netrin-G2 (gene symbols: Ntng1 and Ntng2, respectively), were responsible for complementary behavioral functions. Netrin-G2, but not netrin-G1, encoded demanding sensorimotor functions. Both paralogs were responsible for complex vertebrate-specific cognitive functions and fine-scale regulation of basic adaptive behaviors conserved between invertebrates and vertebrates, such as spatial reference and working memory, attention, impulsivity and anxiety etc. Remarkably, netrin-G1 and netrin-G2 encoded a genetic "division of labor" in behavioral regulation, selectively mediating different tasks or even different details of the same task. At the cellular level, netrin-G1 and netrin-G2 differentially regulated the sub-synaptic localization of their cognate receptors and differentiated the properties of postsynaptic scaffold proteins in complementary neural pathways. CONCLUSIONS Pre-synaptic netrin-G1 and netrin-G2 diversify the complexity of vertebrate behaviors and differentially regulate post-synaptic properties. Our findings constitute the first genetic analysis of the behavioral and synaptic diversification roles of a vertebrate GPI protein and presynaptic adhesion molecule family.
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Affiliation(s)
- Qi Zhang
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Hiromichi Goto
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Sachiko Akiyoshi-Nishimura
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Pavel Prosselkov
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Chie Sano
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Hiroshi Matsukawa
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Kunio Yaguchi
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Toshiaki Nakashiba
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
| | - Shigeyoshi Itohara
- Laboratory for Behavioral Genetics, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
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232
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Affiliation(s)
- P. K. Dalal
- Department of Psychiatry, King George's Medical University, Lucknow, Uttar Pradesh, India
| | - Debasish Basu
- Department of Psychiatry, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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233
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Monteiro P, Feng G. Learning From Animal Models of Obsessive-Compulsive Disorder. Biol Psychiatry 2016; 79:7-16. [PMID: 26037910 PMCID: PMC4633402 DOI: 10.1016/j.biopsych.2015.04.020] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 03/24/2015] [Accepted: 04/13/2015] [Indexed: 12/29/2022]
Abstract
Obsessive-compulsive disorder (OCD) affects 2%-3% of the population worldwide and can cause significant distress and disability. Substantial challenges remain in the field of OCD research and therapeutics. Approved interventions alleviate symptoms only partially, with 30%-40% of patients being resistant to treatment. Although the etiology of OCD is still unknown, research evidence points toward the involvement of cortico-striato-thalamocortical circuitry. This review focuses on the most recent behavioral, genetics, and neurophysiologic findings from animal models of OCD. Based on evidence from these models and parallels with human studies, we discuss the circuit hyperactivity hypothesis for OCD, a potential circuitry dysfunction of action termination, and the involvement of candidate genes. Adding a more biologically valid framework to OCD will help researchers define and test new hypotheses and facilitate the development of targeted therapies based on disease-specific mechanisms.
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Affiliation(s)
- Patricia Monteiro
- McGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA,PhD Programme in Experimental Biology and Biomedicine (PDBEB), Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal,Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Guoping Feng
- McGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts; Stanley Center for Psychiatric Research, Eli and Edythe L. Broad Institute of MIT and Harvard, Cambridge, Massachusetts.
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234
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Wood J, Ahmari SE. A Framework for Understanding the Emerging Role of Corticolimbic-Ventral Striatal Networks in OCD-Associated Repetitive Behaviors. Front Syst Neurosci 2015; 9:171. [PMID: 26733823 PMCID: PMC4681810 DOI: 10.3389/fnsys.2015.00171] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 11/23/2015] [Indexed: 11/13/2022] Open
Abstract
Significant interest in the mechanistic underpinnings of obsessive-compulsive disorder (OCD) has fueled research on the neural origins of compulsive behaviors. Converging clinical and preclinical evidence suggests that abnormal repetitive behaviors are driven by dysfunction in cortico-striatal-thalamic-cortical (CSTC) circuits. These findings suggest that compulsive behaviors arise, in part, from aberrant communication between lateral orbitofrontal cortex (OFC) and dorsal striatum. An important body of work focused on the role of this network in OCD has been instrumental to progress in the field. Disease models focused primarily on these regions, however, fail to capture an important aspect of the disorder: affective dysregulation. High levels of anxiety are extremely prevalent in OCD, as is comorbidity with major depressive disorder. Furthermore, deficits in processing rewards and abnormalities in processing emotional stimuli are suggestive of aberrant encoding of affective information. Accordingly, OCD can be partially characterized as a disease in which behavioral selection is corrupted by exaggerated or dysregulated emotional states. This suggests that the networks producing OCD symptoms likely expand beyond traditional lateral OFC and dorsal striatum circuit models, and highlights the need to cast a wider net in our investigation of the circuits involved in generating and sustaining OCD symptoms. Here, we address the emerging role of medial OFC, amygdala, and ventral tegmental area projections to the ventral striatum (VS) in OCD pathophysiology. The VS receives strong innervation from these affect and reward processing regions, and is therefore poised to integrate information crucial to the generation of compulsive behaviors. Though it complements functions of dorsal striatum and lateral OFC, this corticolimbic-VS network is less commonly explored as a potential source of the pathology underlying OCD. In this review, we discuss this network's potential role as a locus of OCD pathology and effective treatment.
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Affiliation(s)
- Jesse Wood
- Translational Neuroscience Program, Department of Psychiatry, University of PittsburghPittsburgh, PA, USA
- Center for Neuroscience, University of PittsburghPittsburgh, PA, USA
| | - Susanne E. Ahmari
- Translational Neuroscience Program, Department of Psychiatry, University of PittsburghPittsburgh, PA, USA
- Center for Neuroscience, University of PittsburghPittsburgh, PA, USA
- Center for the Neural Basis of Cognition, University of PittsburghPittsburgh, PA, USA
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235
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Grassi G, Pallanti S, Righi L, Figee M, Mantione M, Denys D, Piccagliani D, Rossi A, Stratta P. Think twice: Impulsivity and decision making in obsessive-compulsive disorder. J Behav Addict 2015; 4:263-72. [PMID: 26690621 PMCID: PMC4712760 DOI: 10.1556/2006.4.2015.039] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND AND AIMS Recent studies have challenged the anxiety-avoidance model of obsessive-compulsive disorder (OCD), linking OCD to impulsivity, risky-decision-making and reward-system dysfunction, which can also be found in addiction and might support the conceptualization of OCD as a behavioral addiction. Here, we conducted an exploratory investigation of the behavioral addiction model of OCD by assessing whether OCD patients are more impulsive, have impaired decision-making, and biased probabilistic reasoning, three core dimensions of addiction, in a sample of OCD patients and healthy controls. METHODS We assessed these dimensions on 38 OCD patients and 39 healthy controls with the Barratt Impulsiveness Scale (BIS-11), the Iowa Gambling Task (IGT) and the Beads Task. RESULTS OCD patients had significantly higher BIS-11 scores than controls, in particular on the cognitive subscales. They performed significantly worse than controls on the IGT preferring immediate reward despite negative future consequences, and did not learn from losses. Finally, OCD patients demonstrated biased probabilistic reasoning as reflected by significantly fewer draws to decision than controls on the Beads Task. CONCLUSIONS OCD patients are more impulsive than controls and demonstrate risky decision-making and biased probabilistic reasoning. These results might suggest that other conceptualizations of OCD, such as the behavioral addiction model, may be more suitable than the anxiety-avoidance one. However, further studies directly comparing OCD and behavioral addiction patients are needed in order to scrutinize this model.
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Affiliation(s)
- Giacomo Grassi
- Department of Neurofarba, University of Florence, Florence, Italy,Corresponding author: Giacomo Grassi, MD; Department of Neurofarba, University of Florence, via delle Gore 2H, 50141 Florence, Italy; Phone: 00390557949707; Fax: 0039055794707; E-mail:
| | - Stefano Pallanti
- Department of Neurofarba, University of Florence, Florence, Italy
| | - Lorenzo Righi
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
| | - Martijn Figee
- Department of Psychiatry, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - Mariska Mantione
- Department of Psychiatry, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | - Damiaan Denys
- Department of Psychiatry, Academic Medical Center, University of Amsterdam, Amsterdam, the Netherlands
| | | | - Alessandro Rossi
- Department of Mental Health, University of L’Aquila, L’Aquila, Italy
| | - Paolo Stratta
- Department of Mental Health, University of L’Aquila, L’Aquila, Italy
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236
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McElroy SL, Mitchell JE, Wilfley D, Gasior M, Ferreira-Cornwell MC, McKay M, Wang J, Whitaker T, Hudson JI. Lisdexamfetamine Dimesylate Effects on Binge Eating Behaviour and Obsessive-Compulsive and Impulsive Features in Adults with Binge Eating Disorder. EUROPEAN EATING DISORDERS REVIEW 2015; 24:223-31. [DOI: 10.1002/erv.2418] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 09/17/2015] [Accepted: 10/26/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Susan L. McElroy
- University of Cincinnati College of Medicine; Cincinnati OH USA
- Lindner Center of HOPE; Mason OH USA
| | | | - Denise Wilfley
- Washington University School of Medicine; St. Louis MO USA
| | | | | | | | - Jiannong Wang
- CSL Behring; King of Prussia PA USA (previously employed at Shire)
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237
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Barahona-Corrêa JB, Camacho M, Castro-Rodrigues P, Costa R, Oliveira-Maia AJ. From Thought to Action: How the Interplay Between Neuroscience and Phenomenology Changed Our Understanding of Obsessive-Compulsive Disorder. Front Psychol 2015; 6:1798. [PMID: 26635696 PMCID: PMC4655583 DOI: 10.3389/fpsyg.2015.01798] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 11/07/2015] [Indexed: 01/25/2023] Open
Abstract
The understanding of obsessive-compulsive disorder (OCD) has evolved with the knowledge of behavior, the brain, and their relationship. Modern views of OCD as a neuropsychiatric disorder originated from early lesion studies, with more recent models incorporating detailed neuropsychological findings, such as perseveration in set-shifting tasks, and findings of altered brain structure and function, namely of orbitofrontal corticostriatal circuits and their limbic connections. Interestingly, as neurobiological models of OCD evolved from cortical and cognitive to sub-cortical and behavioral, the focus of OCD phenomenology also moved from thought control and contents to new concepts rooted in animal models of action control. Most recently, the proposed analogy between habitual action control and compulsive behavior has led to the hypothesis that individuals suffering from OCD may be predisposed to rely excessively on habitual rather than on goal-directed behavioral strategies. Alternatively, compulsions have been proposed to result either from hyper-valuation of certain actions and/or their outcomes, or from excessive uncertainty in the monitoring of action performance, both leading to perseveration in prepotent actions such as washing or checking. In short, the last decades have witnessed a formidable renovation in the pathophysiology, phenomenology, and even semantics, of OCD. Nevertheless, such progress is challenged by several caveats, not least psychopathological oversimplification and overgeneralization of animal to human extrapolations. Here we present an historical overview of the understanding of OCD, highlighting converging studies and trends in neuroscience, psychiatry and neuropsychology, and how they influenced current perspectives on the nosology and phenomenology of this disorder.
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Affiliation(s)
- J Bernardo Barahona-Corrêa
- Department of Psychiatry and Mental Health, Faculdade de Ciências Médicas, Nova Medical School , Lisbon, Portugal ; Department of Psychiatry and Mental Health, Centro Hospitalar de Lisboa Ocidental , Lisbon, Portugal ; Champalimaud Clinical Centre, Champalimaud Centre for the Unknown , Lisbon, Portugal ; Centro de Apoio ao Desenvolvimento Infantil , Cascais, Portugal
| | - Marta Camacho
- Champalimaud Clinical Centre, Champalimaud Centre for the Unknown , Lisbon, Portugal
| | - Pedro Castro-Rodrigues
- Champalimaud Clinical Centre, Champalimaud Centre for the Unknown , Lisbon, Portugal ; Centro Hospitalar Psiquiátrico de Lisboa , Lisbon, Portugal
| | - Rui Costa
- Champalimaud Research, Champalimaud Centre for the Unknown , Lisbon, Portugal
| | - Albino J Oliveira-Maia
- Department of Psychiatry and Mental Health, Centro Hospitalar de Lisboa Ocidental , Lisbon, Portugal ; Champalimaud Clinical Centre, Champalimaud Centre for the Unknown , Lisbon, Portugal ; Champalimaud Research, Champalimaud Centre for the Unknown , Lisbon, Portugal
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238
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Di Giovanni G, De Deurwaerdère P. New therapeutic opportunities for 5-HT2C receptor ligands in neuropsychiatric disorders. Pharmacol Ther 2015; 157:125-62. [PMID: 26617215 DOI: 10.1016/j.pharmthera.2015.11.009] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The 5-HT2C receptor (R) displays a widespread distribution in the CNS and is involved in the action of 5-HT in all brain areas. Knowledge of its functional role in the CNS pathophysiology has been impaired for many years due to the lack of drugs capable of discriminating among 5-HT2R subtypes, and to a lesser extent to the 5-HT1B, 5-HT5, 5-HT6 and 5-HT7Rs. The situation has changed since the mid-90s due to the increased availability of new and selective synthesized compounds, the creation of 5-HT2C knock out mice, and the progress made in molecular biology. Many pharmacological classes of drugs including antipsychotics, antidepressants and anxiolytics display affinities toward 5-HT2CRs and new 5-HT2C ligands have been developed for various neuropsychiatric disorders. The 5-HT2CR is presumed to mediate tonic/constitutive and phasic controls on the activity of different central neurobiological networks. Preclinical data illustrate this complexity to a point that pharmaceutical companies developed either agonists or antagonists for the same disease. In order to better comprehend this complexity, this review will briefly describe the molecular pharmacology of 5-HT2CRs, as well as their cellular impacts in general, before addressing its central distribution in the mammalian brain. Thereafter, we review the preclinical efficacy of 5-HT2C ligands in numerous behavioral tests modeling human diseases, highlighting the multiple and competing actions of the 5-HT2CRs in neurobiological networks and monoaminergic systems. Notably, we will focus this evidence in the context of the physiopathology of psychiatric and neurological disorders including Parkinson's disease, levodopa-induced dyskinesia, and epilepsy.
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Affiliation(s)
- Giuseppe Di Giovanni
- Department of Physiology & Biochemistry, Faculty of Medicine and Surgery, University of Malta; Neuroscience Division, School of Biosciences, Cardiff University, Cardiff, UK.
| | - Philippe De Deurwaerdère
- Centre National de la Recherche Scientifique (Unité Mixte de Recherche 5293) 33076 Bordeaux Cedex, France.
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Mice Lacking the Serotonin Htr2B Receptor Gene Present an Antipsychotic-Sensitive Schizophrenic-Like Phenotype. Neuropsychopharmacology 2015; 40:2764-73. [PMID: 25936642 PMCID: PMC4864652 DOI: 10.1038/npp.2015.126] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 04/08/2015] [Accepted: 04/25/2015] [Indexed: 11/09/2022]
Abstract
Impulsivity and hyperactivity share common ground with numerous mental disorders, including schizophrenia. Recently, a population-specific serotonin 2B (5-HT2B) receptor stop codon (ie, HTR2B Q20*) was reported to segregate with severely impulsive individuals, whereas 5-HT2B mutant (Htr2B(-/-)) mice also showed high impulsivity. Interestingly, in the same cohort, early-onset schizophrenia was more prevalent in HTR2B Q*20 carriers. However, the putative role of 5-HT2B receptor in the neurobiology of schizophrenia has never been investigated. We assessed the effects of the genetic and the pharmacological ablation of 5-HT2B receptors in mice subjected to a comprehensive series of behavioral test screenings for schizophrenic-like symptoms and investigated relevant dopaminergic and glutamatergic neurochemical alterations in the cortex and the striatum. Domains related to the positive, negative, and cognitive symptom clusters of schizophrenia were affected in Htr2B(-/-) mice, as shown by deficits in sensorimotor gating, in selective attention, in social interactions, and in learning and memory processes. In addition, Htr2B(-/-) mice presented with enhanced locomotor response to the psychostimulants dizocilpine and amphetamine, and with robust alterations in sleep architecture. Moreover, ablation of 5-HT2B receptors induced a region-selective decrease of dopamine and glutamate concentrations in the dorsal striatum. Importantly, selected schizophrenic-like phenotypes and endophenotypes were rescued by chronic haloperidol treatment. We report herein that 5-HT2B receptor deficiency confers a wide spectrum of antipsychotic-sensitive schizophrenic-like behavioral and psychopharmacological phenotypes in mice and provide first evidence for a role of 5-HT2B receptors in the neurobiology of psychotic disorders.
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240
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Culbert KM, Racine SE, Klump KL. Research Review: What we have learned about the causes of eating disorders - a synthesis of sociocultural, psychological, and biological research. J Child Psychol Psychiatry 2015; 56:1141-64. [PMID: 26095891 DOI: 10.1111/jcpp.12441] [Citation(s) in RCA: 286] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/11/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND Eating disorders are severe psychiatric disorders with a complex etiology involving transactions among sociocultural, psychological, and biological influences. Most research and reviews, however, focus on only one level of analysis. To address this gap, we provide a qualitative review and summary using an integrative biopsychosocial approach. METHODS We selected variables for which there were available data using integrative methodologies (e.g., twin studies, gene-environment interactions) and/or data at the biological and behavioral level (e.g., neuroimaging). Factors that met these inclusion criteria were idealization of thinness, negative emotionality, perfectionism, negative urgency, inhibitory control, cognitive inflexibility, serotonin, dopamine, ovarian hormones. Literature searches were conducted using PubMed. Variables were classified as risk factors or correlates of eating disorder diagnoses and disordered eating symptoms using Kraemer et al.'s (1997) criteria. FINDINGS Sociocultural idealization of thinness variables (media exposure, pressures for thinness, thin-ideal internalization, thinness expectancies) and personality traits (negative emotionality, perfectionism, negative urgency) attained 'risk status' for eating disorders and/or disordered eating symptoms. Other factors were identified as correlates of eating pathology or were not classified given limited data. Effect sizes for risk factors and correlates were generally small-to-moderate in magnitude. CONCLUSIONS Multiple biopsychosocial influences are implicated in eating disorders and/or disordered eating symptoms and several can now be considered established risk factors. Data suggest that psychological and environmental factors interact with and influence the expression of genetic risk to cause eating pathology. Additional studies that examine risk variables across multiple levels of analysis and that consider specific transactional processes amongst variables are needed to further elucidate the intersection of sociocultural, psychological, and biological influences on eating disorders.
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Affiliation(s)
| | - Sarah E Racine
- Department of Psychology, Ohio University, Athens, OH, USA
| | - Kelly L Klump
- Department of Psychology, Michigan State University, East Lansing, MI, USA
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241
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Godier LR, Park RJ. Does compulsive behavior in Anorexia Nervosa resemble an addiction? A qualitative investigation. Front Psychol 2015; 6:1608. [PMID: 26539148 PMCID: PMC4611244 DOI: 10.3389/fpsyg.2015.01608] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/05/2015] [Indexed: 12/26/2022] Open
Abstract
The characteristic relentless self-starvation behavior seen in Anorexia Nervosa (AN) has been described as evidence of compulsivity, with increasing suggestion of parallels with addictive behavior. This study used a thematic qualitative analysis to investigate the parallels between compulsive behavior in AN and Substance Use Disorders (SUD). Forty individuals currently suffering from AN completed an online questionnaire reflecting on their experience of compulsive behavior in AN. Eight main themes emerged from thematic qualitative analysis; compulsivity as central to AN, impaired control, escalating compulsions, emotional triggers, negative reactions, detrimental continuation of behavior, functional impairment, and role in recovery. These results suggested that individuals with AN view the compulsive nature of their behavior as central to the maintenance of their disorder, and as a significant barrier to recovery. The themes that emerged also showed parallels with the DSM-V criteria for SUDs, mapping onto the four groups of criteria (impaired control, social impairment, risky use of substance, pharmacological criteria). These results emphasize the need for further research to explore the possible parallels in behavioral and neural underpinnings of compulsivity in AN and SUDs, which may inform novel treatment avenues for AN.
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Affiliation(s)
- Lauren R Godier
- Oxford Brain-Body Research into Eating Disorders, Department of Psychiatry, University of Oxford Oxford, UK
| | - Rebecca J Park
- Oxford Brain-Body Research into Eating Disorders, Department of Psychiatry, University of Oxford Oxford, UK
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242
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Abstract
BACKGROUND Obsessive compulsive personality disorder (OCPD) is characterized by perfectionism, need for control, and cognitive rigidity. Currently, little neuropsychological data exist on this condition, though emerging evidence does suggest that disorders marked by compulsivity, including obsessive-compulsive disorder (OCD), are associated with impairment in cognitive flexibility and executive planning on neurocognitive tasks. AIM The current study investigated the neurocognitive profile in a nonclinical community-based sample of people fulfilling diagnostic criteria for OCPD in the absence of major psychiatric comorbidity. METHOD Twenty-one nonclinical subjects who fulfilled Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) criteria for OCPD were compared with 15 healthy controls on selected clinical and neurocognitive tasks. OCPD was measured using the Compulsive Personality Assessment Scale (CPAS). Participants completed tests from the Cambridge Automated Neuropsychological Test Battery including tests of set shifting (Intra-Extra Dimensional [IED] Set Shifting) executive planning (Stockings of Cambridge [SOC]), and decision making (Cambridge Gamble Task [CGT]). RESULTS The OCPD group made significantly more IED-ED shift errors and total shift errors, and also showed longer mean initial thinking time on the SOC at moderate levels of difficulty. No differences emerged on the CGT. CONCLUSIONS Nonclinical cases of OCPD showed significant cognitive inflexibility coupled with executive planning deficits, whereas decision-making remained intact. This profile of impairment overlaps with that of OCD and implies that common neuropsychological changes affect individuals with these disorders.
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243
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Maslen H, Pugh J, Savulescu J. The Ethics of Deep Brain Stimulation for the Treatment of Anorexia Nervosa. NEUROETHICS-NETH 2015; 8:215-230. [PMID: 26594256 PMCID: PMC4643100 DOI: 10.1007/s12152-015-9240-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 09/10/2015] [Indexed: 11/09/2022]
Abstract
There is preliminary evidence, from case reports and investigational studies, to suggest that Deep Brain Stimulation (DBS) could be used to treat some patients with Anorexia Nervosa (AN). Although this research is at an early stage, the invasive nature of the intervention and the vulnerability of the potential patients are such that anticipatory ethical analysis is warranted. In this paper, we first show how different treatment mechanisms raise different philosophical and ethical questions. We distinguish three potential mechanisms alluded to in the neuroscientific literature, relating to desire, control, and emotion, respectively. We explain why the precise nature of the mechanism has important implications for the patient's autonomy and personal identity. In the second part of the paper, we consider practical dimensions of offering DBS to patients with AN in certain cases. We first discuss some limited circumstances where the mere offering of the intervention might be perceived as exerting a degree of coercive pressure that could serve to undermine the validity of the patient's consent. Finally, we consider the implications of potential effects of DBS for the authenticity of the patient's choice to continue using stimulation to ameliorate their condition.
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Affiliation(s)
- Hannah Maslen
- The Oxford Uehiro Centre for Practical Ethics, Suite 8, Littlegate House 16/17 St Ebbe’s Street, Oxford, OX1 1PT UK
| | - Jonathan Pugh
- The Oxford Uehiro Centre for Practical Ethics, Suite 8, Littlegate House 16/17 St Ebbe’s Street, Oxford, OX1 1PT UK
| | - Julian Savulescu
- The Oxford Uehiro Centre for Practical Ethics, Suite 8, Littlegate House 16/17 St Ebbe’s Street, Oxford, OX1 1PT UK
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244
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Love T, Laier C, Brand M, Hatch L, Hajela R. Neuroscience of Internet Pornography Addiction: A Review and Update. Behav Sci (Basel) 2015; 5:388-433. [PMID: 26393658 PMCID: PMC4600144 DOI: 10.3390/bs5030388] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 08/29/2015] [Accepted: 09/08/2015] [Indexed: 02/07/2023] Open
Abstract
Many recognize that several behaviors potentially affecting the reward circuitry in human brains lead to a loss of control and other symptoms of addiction in at least some individuals. Regarding Internet addiction, neuroscientific research supports the assumption that underlying neural processes are similar to substance addiction. The American Psychiatric Association (APA) has recognized one such Internet related behavior, Internet gaming, as a potential addictive disorder warranting further study, in the 2013 revision of their Diagnostic and Statistical Manual. Other Internet related behaviors, e.g., Internet pornography use, were not covered. Within this review, we give a summary of the concepts proposed underlying addiction and give an overview about neuroscientific studies on Internet addiction and Internet gaming disorder. Moreover, we reviewed available neuroscientific literature on Internet pornography addiction and connect the results to the addiction model. The review leads to the conclusion that Internet pornography addiction fits into the addiction framework and shares similar basic mechanisms with substance addiction. Together with studies on Internet addiction and Internet Gaming Disorder we see strong evidence for considering addictive Internet behaviors as behavioral addiction. Future research needs to address whether or not there are specific differences between substance and behavioral addiction.
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Affiliation(s)
- Todd Love
- Society for the Advancement of Sexual Health, Ardmore, PA 19003, USA.
| | - Christian Laier
- Department of General Psychology: Cognition, University of Duisburg-Essen, Duisburg 47057, Germany.
| | - Matthias Brand
- Department of General Psychology: Cognition, University of Duisburg-Essen, Duisburg 47057, Germany.
- Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen 45141, Germany.
| | - Linda Hatch
- Private Practice, Santa Barbara, CA 93103, USA.
| | - Raju Hajela
- Health Upwardly Mobile Inc., Calgary, AB T2S 0J2, Canada.
- Diagnostic and Descriptive Terminology Action Group (DDTAG), American Society of Addiction Medicine (ASAM), Chevy Chase, MD 93101, USA.
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245
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Payer DE, Park MTM, Kish SJ, Kolla NJ, Lerch JP, Boileau I, Chakravarty MM. Personality disorder symptomatology is associated with anomalies in striatal and prefrontal morphology. Front Hum Neurosci 2015; 9:472. [PMID: 26379535 PMCID: PMC4553386 DOI: 10.3389/fnhum.2015.00472] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 08/12/2015] [Indexed: 01/18/2023] Open
Abstract
Personality disorder symptomatology (PD-Sx) can result in personal distress and impaired interpersonal functioning, even in the absence of a clinical diagnosis, and is frequently comorbid with psychiatric disorders such as substance use, mood, and anxiety disorders; however, they often remain untreated, and are not taken into account in clinical studies. To investigate brain morphological correlates of PD-Sx, we measured subcortical volume and shape, and cortical thickness/surface area, based on structural magnetic resonance images. We investigated 37 subjects who reported PD-Sx exceeding DSM-IV Axis-II screening thresholds, and 35 age, sex, and smoking status-matched control subjects. Subjects reporting PD-Sx were then grouped into symptom-based clusters: N = 20 into Cluster B (reporting Antisocial, Borderline, Histrionic, or Narcissistic PD-Sx) and N = 28 into Cluster C (reporting Obsessive–Compulsive, Avoidant, or Dependent PD-Sx); N = 11 subjects reported PD-Sx from both clusters, and none reported Cluster A (Paranoid, Schizoid, or Schizotypal) PD-Sx. Compared to control, Cluster C PD-Sx was associated with greater striatal surface area localized to the caudate tail, smaller ventral striatum volumes, and greater cortical thickness in right prefrontal cortex. Both Cluster B and C PD-Sx groups also showed trends toward greater posterior caudate volumes and orbitofrontal surface area anomalies, but these findings did not survive correction for multiple comparisons. The results point to morphological abnormalities that could contribute to Cluster C PD-Sx. In addition, the observations parallel those in substance use disorders, pointing to the importance of considering PD-Sx when interpreting findings in often-comorbid psychiatric disorders.
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Affiliation(s)
- Doris E Payer
- Addictions Program, Centre for Addiction and Mental Health, Toronto ON, Canada ; Research Imaging Centre, Centre for Addiction and Mental Health, Toronto ON, Canada ; Department of Psychiatry, University of Toronto, Toronto ON, Canada
| | - Min Tae M Park
- Research Imaging Centre, Centre for Addiction and Mental Health, Toronto ON, Canada ; Cerebral Imaging Centre, Douglas Mental Health University Institute, Verdun QC, Canada ; Schulich School of Medicine and Dentistry, Western University, London ON, Canada
| | - Stephen J Kish
- Research Imaging Centre, Centre for Addiction and Mental Health, Toronto ON, Canada ; Department of Psychiatry, University of Toronto, Toronto ON, Canada
| | - Nathan J Kolla
- Department of Psychiatry, University of Toronto, Toronto ON, Canada ; Complex Mental Illness Program, Forensic Service, Centre for Addiction and Mental Health, Toronto ON, Canada
| | - Jason P Lerch
- Department of Medical Biophysics, University of Toronto, Toronto ON, Canada ; Mouse Imaging Centre, Hospital for Sick Children, Toronto ON, Canada
| | - Isabelle Boileau
- Research Imaging Centre, Centre for Addiction and Mental Health, Toronto ON, Canada ; Department of Psychiatry, University of Toronto, Toronto ON, Canada
| | - M M Chakravarty
- Research Imaging Centre, Centre for Addiction and Mental Health, Toronto ON, Canada ; Cerebral Imaging Centre, Douglas Mental Health University Institute, Verdun QC, Canada ; Department of Psychiatry and Biomedical Engineering, McGill University, Montreal QC, Canada
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Íbias J, Soria-Molinillo E, Kastanauskaite A, Orgaz C, DeFelipe J, Pellón R, Miguéns M. Schedule-induced polydipsia is associated with increased spine density in dorsolateral striatum neurons. Neuroscience 2015; 300:238-45. [DOI: 10.1016/j.neuroscience.2015.05.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 04/29/2015] [Accepted: 05/11/2015] [Indexed: 01/03/2023]
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Persistent effects of chronic Δ9-THC exposure on motor impulsivity in rats. Psychopharmacology (Berl) 2015; 232:3033-43. [PMID: 25925779 DOI: 10.1007/s00213-015-3942-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 04/14/2015] [Indexed: 10/23/2022]
Abstract
RATIONALE In humans, long-term marijuana use is associated with impaired impulse control and attentional capacity, though it has been difficult to distinguish pre-existing cognitive deficits from possible consequences of prolonged marijuana exposure. OBJECTIVE To evaluate the effects of long-term exposure to Δ9-Tetrahydrocannabinol (Δ9-THC), the primary psychoactive constituent in marijuana, on indices of impulse control and attentional capacity using the rat 5-Choice Serial Reaction Time Task (5-CSRTT). METHODS Ten 14-day cycles of Δ9-THC dosing and 5-CSRTT testing were employed, each comprised of 5-day Δ9-THC dosing (0.3 or 3 mg/kg b.i.d.) and 5-CSRTT testing during the 9 days of drug abstinence. Subsequent 5-CSRTT testing continued during 5 weeks of protracted abstinence. RESULTS Dose-dependent increases in motor impulsivity (premature responses) and behavioral disinhibition (perseverative responses) emerged following 5 cycles of Δ9-THC exposure that persisted for the remaining dosing and testing cycles. Δ9-THC-related disruptions in motor impulsivity and behavioral inhibition were most pronounced during cognitively challenging 5-CSRTT sessions incorporating varying novel inter-trial intervals (ITIs), and these disruptions persisted for at least 5 weeks of Δ9-THC abstinence. Δ9-THC-related impairments in attentional capacity (response accuracy) were also evident during variable ITI challenge tests, though these attentional disruptions abated within 3 weeks of Δ9-THC abstinence. CONCLUSIONS These observations demonstrate that long-term intermittent exposure to clinically meaningful Δ9-THC doses induces persistent impairments in impulse control and attentional function. If present in humans, these disruptions may impact academic and professional performance.
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Testing the disgust conditioning theory of food-avoidance in adolescents with recent onset anorexia nervosa. Behav Res Ther 2015; 71:131-8. [DOI: 10.1016/j.brat.2015.06.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Revised: 06/10/2015] [Accepted: 06/18/2015] [Indexed: 11/18/2022]
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Anastasio NC, Stutz SJ, Fink LHL, Swinford-Jackson SE, Sears RM, DiLeone RJ, Rice KC, Moeller FG, Cunningham KA. Serotonin (5-HT) 5-HT2A Receptor (5-HT2AR):5-HT2CR Imbalance in Medial Prefrontal Cortex Associates with Motor Impulsivity. ACS Chem Neurosci 2015; 6:1248-58. [PMID: 26120876 DOI: 10.1021/acschemneuro.5b00094] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
A feature of multiple neuropsychiatric disorders is motor impulsivity. Recent studies have implicated serotonin (5-HT) systems in medial prefrontal cortex (mPFC) in mediating individual differences in motor impulsivity, notably the 5-HT2AR receptor (5-HT2AR) and 5-HT2CR. We investigated the hypothesis that differences in the ratio of 5-HT2AR:5-HT2CR protein expression in mPFC would predict the individual level of motor impulsivity and that the engineered loss of the 5-HT2CR would result in high motor impulsivity concomitant with elevated 5-HT2AR expression and pharmacological sensitivity to the selective 5-HT2AR antagonist M100907. High and low impulsive rats were identified in a 1-choice serial reaction time task. Native protein levels of the 5-HT2AR and the 5-HT2CR predicted the intensity of motor impulsivity and the 5-HT2AR:5-HT2CR ratio in mPFC positively correlated with levels of premature responses in individual outbred rats. The possibility that the 5-HT2AR and 5-HT2CR act in concert to control motor impulsivity is supported by the observation that high phenotypic motor impulsivity associated with a diminished mPFC synaptosomal 5-HT2AR:5-HT2CR protein:protein interaction. Knockdown of mPFC 5-HT2CR resulted in increased motor impulsivity and triggered a functional disruption of the local 5-HT2AR:5-HT2CR balance as evidenced by a compensatory upregulation of 5-HT2AR protein expression and a leftward shift in the potency of M100907 to suppress impulsive behavior. We infer that there is an interactive relationship between the mPFC 5-HT2AR and 5-HT2CR, and that a 5-HT2AR:5-HT2CR imbalance may be a functionally relevant mechanism underlying motor impulsivity.
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Affiliation(s)
| | | | | | | | - Robert M. Sears
- Department
of Psychiatry, Yale University, New Haven, Connecticut 06520, United States
| | - Ralph J. DiLeone
- Department
of Psychiatry, Yale University, New Haven, Connecticut 06520, United States
| | - Kenner C. Rice
- Chemical
Biology Research Branch, National Institute on Drug Abuse, DHHS/NIH/NIDA, Bethesda, Maryland 20892, United States
| | - F. Gerard Moeller
- Department
of Psychiatry, Virginia Commonwealth University School of Medicine, Richmond, Virginia 23298, United States
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Enhancing glutamatergic transmission during adolescence reverses early-life stress-induced deficits in the rewarding effects of cocaine in rats. Neuropharmacology 2015; 99:168-76. [PMID: 26187394 DOI: 10.1016/j.neuropharm.2015.07.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 07/06/2015] [Accepted: 07/11/2015] [Indexed: 12/20/2022]
Abstract
Adolescence marks a critical time when the brain is highly susceptible to pathological insult yet also uniquely amenable to therapeutic intervention. It is during adolescence that the onset of the majority of psychiatric disorders, including substance use disorder (SUDs), occurs. It has been well established that stress, particularly during early development, can contribute to the pathological changes which contribute to the development of SUDs. Glutamate as the main excitatory neurotransmitter in the mammalian CNS plays a key role in various physiological processes, including reward function, and in mediating the effects of psychological stress. We hypothesised impairing glutamatergic signalling during the key adolescent period would attenuate early-life stress induced impaired reward function. To test this, we induced early-life stress in male rats using the maternal-separation procedure. During the critical adolescent period (PND25-46) animals were treated with the glutamate transporter activator, riluzole, or the NMDA receptor antagonist, memantine. Adult reward function was assessed using voluntary cocaine intake measured via intravenous self-administration. We found that early-life stress in the form of maternal-separation impaired reward function, reducing the number of successful cocaine-infusions achieved during the intravenous self-administration procedure as well impairing drug-induced reinstatement of cocaine-taking behaviour. Interestingly, riluzole and memantine treatment reversed this stress-induced impairment. These data suggest that reducing glutamatergic signalling may be a viable therapeutic strategy for treating vulnerable individuals at risk of developing SUDs including certain adolescent populations, particularly those which may have experienced trauma during early-life.
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