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Dinatolo MF, Pur DR, Eagleson R, de Ribaupierre S. The Role of Blood Oxygen Level Dependent Signal Variability in Pediatric Neuroscience: A Systematic Review. Life (Basel) 2023; 13:1587. [PMID: 37511962 PMCID: PMC10382051 DOI: 10.3390/life13071587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 06/27/2023] [Accepted: 07/10/2023] [Indexed: 07/30/2023] Open
Abstract
BACKGROUND As pediatric BOLD Signal Variability (SV) analysis is relatively novel, there is a need to provide a foundational framework that gives researchers an entry point into engaging with the topic. This begins with clarifying the definition of BOLD signal variability by identifying and categorizing the various metrics utilized to measure BOLD SV. METHODS A systematic review of the literature was conducted. Inclusion criteria were restricted to studies utilizing any metric of BOLD SV and with individuals younger than 18 in the study population. The definition of BOLD SV was any measure of intra-individual variability in the BOLD signal. Five databases were searched: Psychinfo, Healthstar, MEDLINE, Embase, and Scopus. RESULTS A total of 17 observational studies, including male (n = 1796) and female (n = 1324) pediatric participants were included. Eight studies quantified variability as the amount of deviation from the average BOLD signal, seven used complexity-based metrics, three used correlation measures of variability, and one used the structure of the hemodynamic response function. In this study, 10 methods of quantifying signal variability were identified. Associations and trends in BOLD SV were commonly found with age, factors specific to mental and/or neurological disorders such as attention deficit disorder, epilepsy, psychotic symptoms, and performance on psychological and behavioral tasks. CONCLUSIONS BOLD SV is a potential biomarker of neurodevelopmental and neurological conditions and symptom severity in mental disorders for defined pediatric populations. Studies that establish clinical trends and identify the mechanisms underlying BOLD SV with a low risk of bias are needed before clinical applications can be utilized by physicians.
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Affiliation(s)
- Michael F Dinatolo
- Schulich School of Medicine and Dentistry, Western University, London, ON N6A 5C1, Canada
| | - Daiana Roxana Pur
- Schulich School of Medicine and Dentistry, Western University, London, ON N6A 5C1, Canada
| | - Roy Eagleson
- Brain and Mind Institute, Western University, London, ON N6A 5B7, Canada
- Department of Electrical and Computer Engineering, Western University, London, ON N6A 3K7, Canada
| | - Sandrine de Ribaupierre
- Brain and Mind Institute, Western University, London, ON N6A 5B7, Canada
- Department of Clinical Neurological Sciences, Schulich School of Medicine and Dentistry, Western University, London, ON N6A 5C1, Canada
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Medina AM, Hagenauer MH, Krolewski DM, Hughes E, Forrester LCT, Walsh DM, Waselus M, Richardson E, Turner CA, Sequeira PA, Cartagena PM, Thompson RC, Vawter MP, Bunney BG, Myers RM, Barchas JD, Lee FS, Schatzberg AF, Bunney WE, Akil H, Watson SJ. Neurotransmission-related gene expression in the frontal pole is altered in subjects with bipolar disorder and schizophrenia. Transl Psychiatry 2023; 13:118. [PMID: 37031222 PMCID: PMC10082811 DOI: 10.1038/s41398-023-02418-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 03/22/2023] [Accepted: 03/27/2023] [Indexed: 04/10/2023] Open
Abstract
The frontal pole (Brodmann area 10, BA10) is the largest cytoarchitectonic region of the human cortex, performing complex integrative functions. BA10 undergoes intensive adolescent grey matter pruning prior to the age of onset for bipolar disorder (BP) and schizophrenia (SCHIZ), and its dysfunction is likely to underly aspects of their shared symptomology. In this study, we investigated the role of BA10 neurotransmission-related gene expression in BP and SCHIZ. We performed qPCR to measure the expression of 115 neurotransmission-related targets in control, BP, and SCHIZ postmortem samples (n = 72). We chose this method for its high sensitivity to detect low-level expression. We then strengthened our findings by performing a meta-analysis of publicly released BA10 microarray data (n = 101) and identified sources of convergence with our qPCR results. To improve interpretation, we leveraged the unusually large database of clinical metadata accompanying our samples to explore the relationship between BA10 gene expression, therapeutics, substances of abuse, and symptom profiles, and validated these findings with publicly available datasets. Using these convergent sources of evidence, we identified 20 neurotransmission-related genes that were differentially expressed in BP and SCHIZ in BA10. These results included a large diagnosis-related decrease in two important therapeutic targets with low levels of expression, HTR2B and DRD4, as well as other findings related to dopaminergic, GABAergic and astrocytic function. We also observed that therapeutics may produce a differential expression that opposes diagnosis effects. In contrast, substances of abuse showed similar effects on BA10 gene expression as BP and SCHIZ, potentially amplifying diagnosis-related dysregulation.
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Affiliation(s)
- Adriana M Medina
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | | | - David M Krolewski
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | - Evan Hughes
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | | | | | - Maria Waselus
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | - Evelyn Richardson
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | - Cortney A Turner
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | | | | | - Robert C Thompson
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | | | | | - Richard M Myers
- HudsonAlpha Institute for Biotechnology, Huntsville, AL, USA
| | | | | | | | | | - Huda Akil
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | - Stanley J Watson
- Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
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Hirjak D, Meyer-Lindenberg A, Fritze S, Sambataro F, Kubera KM, Wolf RC. Motor dysfunction as research domain across bipolar, obsessive-compulsive and neurodevelopmental disorders. Neurosci Biobehav Rev 2018; 95:315-335. [PMID: 30236781 DOI: 10.1016/j.neubiorev.2018.09.009] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 08/08/2018] [Accepted: 09/12/2018] [Indexed: 02/07/2023]
Abstract
Although genuine motor abnormalities (GMA) are frequently found in schizophrenia, they are also considered as an intrinsic feature of bipolar, obsessive-compulsive, and neurodevelopmental disorders with early onset such as autism, ADHD, and Tourette syndrome. Such transnosological observations strongly suggest a common neural pathophysiology. This systematic review highlights the evidence on GMA and their neuroanatomical substrates in bipolar, obsessive-compulsive, and neurodevelopmental disorders. The data lends support for a common pattern contributing to GMA expression in these diseases that seems to be related to cerebello-thalamo-cortical, fronto-parietal, and cortico-subcortical motor circuit dysfunction. The identified studies provide first evidence for a motor network dysfunction as a correlate of early neurodevelopmental deviance prior to clinical symptom expression. There are also first hints for a developmental risk factor model of these mental disorders. An in-depth analysis of motor networks and related patho-(physiological) mechanisms will not only help promoting Research Domain Criteria (RDoC) Motor System construct, but also facilitate the development of novel psychopharmacological models, as well as the identification of neurobiologically plausible target sites for non-invasive brain stimulation.
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Affiliation(s)
- Dusan Hirjak
- Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
| | - Andreas Meyer-Lindenberg
- Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Stefan Fritze
- Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | | | - Katharina M Kubera
- Center for Psychosocial Medicine, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
| | - Robert C Wolf
- Center for Psychosocial Medicine, Department of General Psychiatry, Heidelberg University, Heidelberg, Germany
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4
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Holz NE, Zohsel K, Laucht M, Banaschewski T, Hohmann S, Brandeis D. Gene x environment interactions in conduct disorder: Implications for future treatments. Neurosci Biobehav Rev 2018; 91:239-258. [DOI: 10.1016/j.neubiorev.2016.08.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 07/27/2016] [Accepted: 08/15/2016] [Indexed: 01/30/2023]
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Qian A, Tao J, Wang X, Liu H, Ji L, Yang C, Ye Q, Chen C, Li J, Cheng J, Wang M, Zhao K. Effects of the 2-Repeat Allele of the DRD4 Gene on Neural Networks Associated With the Prefrontal Cortex in Children With ADHD. Front Hum Neurosci 2018; 12:279. [PMID: 30050420 PMCID: PMC6052087 DOI: 10.3389/fnhum.2018.00279] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Accepted: 06/21/2018] [Indexed: 11/21/2022] Open
Abstract
Objective: Genetic variation, especially polymorphism of the dopamine D4 receptor gene (DRD4), has been linked to deficits in self-regulation and executive functions and to attention deficit hyperactivity disorder (ADHD), and is related to the structural and functional integrity of the default mode network (DMN), the executive control network (ECN) and the sensorimotor network (SMN). The aim of this study was to explore the effects of the 2-repeat allele of the DRD4 gene on brain network connectivity and behaviors in children with ADHD. Methods: Using independent component analysis (ICA) and dimension analyses, we examined resting-state functional magnetic resonance imaging (fMRI) data obtained from 52 Asian medicine-naive children with ADHD (33 2-repeat absent and 19 2-repeat present). Results: We found that individuals with 2-repeat absent demonstrated increased within-network connectivity in the right precuneus of the DMN, the right middle frontal gyrus (MFG) of the SMN compared with individuals with 2-repeat present. Within the ECN, 2-repeat absent showed decreased within-network connectivity in the left inferior frontal gyrus (IFG) and the left anterior cingulate cortex. A deeper study found that connectivity strength of the left IFG was directly proportional to the Stroop reaction time in 2-repeat absent group, and as well as the right MFG in 2-repeat present group. Conclusion: Polymorphisms of the DRD4 gene, specifically 2-repeat allele, had effects on the ECN, the SMN and the DMN, especially in the prefrontal cortex (PFC) circles. ADHD children with DRD4 2-repeat allele have aberrant resting-state within-network connectivity patterns in the left IFG and the right MFG related to dysfunction in inattention symptom. This study provided novel insights into the neural mechanisms underlying the effects of DRD4 2-repeat allele on ADHD.
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Affiliation(s)
- Andan Qian
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jiejie Tao
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xin Wang
- Department of Radiology, Yancheng First Peoples' Hospital, Yancheng, China
| | - Huiru Liu
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Lingxiao Ji
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Chuang Yang
- Department of Mental Health, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Qiong Ye
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Chengchun Chen
- Department of Anatomy, Wenzhou Medical University, Wenzhou, China
| | - Jiance Li
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jingliang Cheng
- Department of Radiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Meihao Wang
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ke Zhao
- School of Mental Health, Wenzhou Medical University, Wenzhou, China
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6
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Qian A, Wang X, Liu H, Tao J, Zhou J, Ye Q, Li J, Yang C, Cheng J, Zhao K, Wang M. Dopamine D4 Receptor Gene Associated with the Frontal-Striatal-Cerebellar Loop in Children with ADHD: A Resting-State fMRI Study. Neurosci Bull 2018; 34:497-506. [PMID: 29564731 DOI: 10.1007/s12264-018-0217-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 01/10/2018] [Indexed: 12/31/2022] Open
Abstract
Attention deficit hyperactivity disorder (ADHD) is a common childhood neuropsychiatric disorder that has been linked to the dopaminergic system. This study aimed to investigate the effects of regulation of the dopamine D4 receptor (DRD4) on functional brain activity during the resting state in ADHD children using the methods of regional homogeneity (ReHo) and functional connectivity (FC). Resting-state functional magnetic resonance imaging data were analyzed in 49 children with ADHD. All participants were classified as either carriers of the DRD4 4-repeat/4-repeat (4R/4R) allele (n = 30) or the DRD4 2-repeat (2R) allele (n = 19). The results showed that participants with the DRD4 2R allele had decreased ReHo bilaterally in the posterior lobes of the cerebellum, while ReHo was increased in the left angular gyrus. Compared with participants carrying the DRD4 4R/4R allele, those with the DRD4 2R allele showed decreased FC to the left angular gyrus in the left striatum, right inferior frontal gyrus, and bilateral lobes of the cerebellum. The increased FC regions included the left superior frontal gyrus, medial frontal gyrus, and rectus gyrus. These data suggest that the DRD4 polymorphisms are associated with localized brain activity and specific functional connections, including abnormality in the frontal-striatal-cerebellar loop. Our study not only enhances the understanding of the correlation between the cerebellar lobes and ADHD, but also provides an imaging basis for explaining the neural mechanisms underlying ADHD in children.
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Affiliation(s)
- Andan Qian
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Xin Wang
- Department of Radiology, Yancheng First People's Hospital, Yancheng, 224000, China
| | - Huiru Liu
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Jiejie Tao
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Jiejie Zhou
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Qiong Ye
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Jiance Li
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Chuang Yang
- Department of Mental Health, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Jingliang Cheng
- Department of Radiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450000, China
| | - Ke Zhao
- Department of Psychiatry, Wenzhou Medical University, Wenzhou, 325000, China.
| | - Meihao Wang
- Department of Radiology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China.
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7
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Klein M, van Donkelaar M, Verhoef E, Franke B. Imaging genetics in neurodevelopmental psychopathology. Am J Med Genet B Neuropsychiatr Genet 2017; 174:485-537. [PMID: 29984470 PMCID: PMC7170264 DOI: 10.1002/ajmg.b.32542] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 02/02/2017] [Accepted: 03/10/2017] [Indexed: 01/27/2023]
Abstract
Neurodevelopmental disorders are defined by highly heritable problems during development and brain growth. Attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorders (ASDs), and intellectual disability (ID) are frequent neurodevelopmental disorders, with common comorbidity among them. Imaging genetics studies on the role of disease-linked genetic variants on brain structure and function have been performed to unravel the etiology of these disorders. Here, we reviewed imaging genetics literature on these disorders attempting to understand the mechanisms of individual disorders and their clinical overlap. For ADHD and ASD, we selected replicated candidate genes implicated through common genetic variants. For ID, which is mainly caused by rare variants, we included genes for relatively frequent forms of ID occurring comorbid with ADHD or ASD. We reviewed case-control studies and studies of risk variants in healthy individuals. Imaging genetics studies for ADHD were retrieved for SLC6A3/DAT1, DRD2, DRD4, NOS1, and SLC6A4/5HTT. For ASD, studies on CNTNAP2, MET, OXTR, and SLC6A4/5HTT were found. For ID, we reviewed the genes FMR1, TSC1 and TSC2, NF1, and MECP2. Alterations in brain volume, activity, and connectivity were observed. Several findings were consistent across studies, implicating, for example, SLC6A4/5HTT in brain activation and functional connectivity related to emotion regulation. However, many studies had small sample sizes, and hypothesis-based, brain region-specific studies were common. Results from available studies confirm that imaging genetics can provide insight into the link between genes, disease-related behavior, and the brain. However, the field is still in its early stages, and conclusions about shared mechanisms cannot yet be drawn.
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Affiliation(s)
- Marieke Klein
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
| | - Marjolein van Donkelaar
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
| | - Ellen Verhoef
- Language and Genetics Department, Max Planck Institute for Psycholinguistics, Nijmegen, The Netherlands
| | - Barbara Franke
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
- Department of Psychiatry, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
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8
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Richards JS, Vásquez AA, van Rooij D, van der Meer D, Franke B, Hoekstra PJ, Heslenfeld DJ, Oosterlaan J, Faraone SV, Hartman CA, Buitelaar JK. Testing differential susceptibility: Plasticity genes, the social environment, and their interplay in adolescent response inhibition. World J Biol Psychiatry 2017; 18:308-321. [PMID: 27170266 PMCID: PMC5435559 DOI: 10.3109/15622975.2016.1173724] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES Impaired inhibitory control is a key feature of attention-deficit/hyperactivity disorder (ADHD). We investigated gene-environment interaction (GxE) as a possible contributing factor to response inhibition variation in context of the differential susceptibility theory. This states individuals carrying plasticity gene variants will be more disadvantaged in negative, but more advantaged in positive environments. METHODS Behavioural and neural measures of response inhibition were assessed during a Stop-signal task in participants with (N = 197) and without (N = 295) ADHD, from N = 278 families (age M = 17.18, SD =3.65). We examined GxE between candidate plasticity genes (DAT1, 5-HTT, DRD4) and social environments (maternal expressed emotion, peer affiliation). RESULTS A DRD4 × Positive peer affiliation interaction was found on the right fusiform gyrus (rFG) activation during successful inhibition. Further, 5-HTT short allele carriers showed increased rFG activation during failed inhibitions. Maternal warmth and positive peer affiliation were positively associated with right inferior frontal cortex activation during successful inhibition. Deviant peer affiliation was positively related to the error rate. CONCLUSIONS While a pattern of differential genetic susceptibility was found, more clarity on the role of the FG during response inhibition is warranted before firm conclusions can be made. Positive and negative social environments were related to inhibitory control. This extends previous research emphasizing adverse environments.
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Affiliation(s)
- Jennifer S. Richards
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands,Karakter Child and Adolescent Psychiatry University Centre, Nijmegen, The Netherlands
| | - Alejandro Arias Vásquez
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands,Department of Psychiatry, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
| | - Daan van Rooij
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
| | - Dennis van der Meer
- University of Groningen, University Medical Center Groningen, Department of Psychiatry, The Netherlands
| | - Barbara Franke
- Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands,Department of Psychiatry, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands
| | - Pieter J. Hoekstra
- University of Groningen, University Medical Center Groningen, Department of Psychiatry, The Netherlands
| | - Dirk J. Heslenfeld
- Department of Clinical Neuropsychology, VU University Amsterdam, Amsterdam, The Netherlands
| | - Jaap Oosterlaan
- Department of Clinical Neuropsychology, VU University Amsterdam, Amsterdam, The Netherlands
| | - Stephen V. Faraone
- SUNY Upstate Medical University Center, Departments of Psychiatry and of Neuroscience and Physiology, Syracuse, USA and the K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, University of Bergen, Bergen, Norway
| | - Catharina A. Hartman
- University of Groningen, University Medical Center Groningen, Department of Psychiatry, The Netherlands
| | - Jan K. Buitelaar
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud university medical center, Nijmegen, The Netherlands,Karakter Child and Adolescent Psychiatry University Centre, Nijmegen, The Netherlands
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Weidacker K, Snowden RJ, Boy F, Johnston SJ. Response inhibition in the parametric Go/No-Go task in psychopathic offenders. Psychiatry Res 2017; 250:256-263. [PMID: 28171793 DOI: 10.1016/j.psychres.2017.01.083] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 01/27/2017] [Accepted: 01/29/2017] [Indexed: 11/17/2022]
Abstract
Previous research on response inhibition in psychopaths has failed to find consistent evidence for aberrant inhibitory ability, despite strong expectations to the contrary. However, previous examinations have utilised inhibition paradigms that suffer from critical shortcomings, such as a lack of ecological validity and overly simplistic response criteria. To assess inhibition under conditions close to the demands of everyday settings, the current study employs a parametric Go/No-go task in male offenders (n77). Additionally, rather than treating psychopathy as a categorical descriptor, a dimensional approach is taken to assess the relationship between individual psychopathic traits and response inhibition performance. Results indicate significant relationships between response inhibition and individual facets of psychopathy as measured by the Psychopathy Checklist: Screening Version. A positive relationship was found between inhibitory ability and interpersonal aspects of psychopathy, reflecting an enhancement of inhibitory functioning for those scoring high on this facet. In addition, a negative association was found between psychopathic lifestyle characteristics and response inhibition. Whereas the negative association mirrors the conceptualisation of the lifestyle facet, the positive association between interpersonal psychopathic aspects and response inhibition might reflect a propensity for adaptive behaviour that enables psychopaths to adequately manipulate their victims and mask their true nature.
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Affiliation(s)
- Kathrin Weidacker
- School of Human and Health Sciences, Department of Psychology, University of Swansea, Swansea, Wales, UK
| | | | - Frederic Boy
- School of Human and Health Sciences, Department of Psychology, University of Swansea, Swansea, Wales, UK
| | - Stephen J Johnston
- School of Human and Health Sciences, Department of Psychology, University of Swansea, Swansea, Wales, UK.
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10
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Munro BA, Weyandt LL, Hall LE, Oster DR, Gudmundsdottir BG, Kuhar BG. Physiological substrates of executive functioning: a systematic review of the literature. ACTA ACUST UNITED AC 2017; 10:1-20. [PMID: 28332146 DOI: 10.1007/s12402-017-0226-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 03/07/2017] [Indexed: 10/19/2022]
Abstract
Executive function (EF) is a multifaceted construct that has been defined as a set of higher-order cognitive processes that allow for flexibility, self-regulation, strategic planning, and goal-directed behaviors. EFs have been studied in numerous clinical disorders using a variety of neuropsychological tasks and, more recently, neuroimaging techniques. The underlying physiological substrates of EF were historically attributed to the frontal lobes; however, recent studies suggest more widespread involvement of additional brain regions. The purpose of the present study was to conduct a systematic review (using PRISMA 2009 guidelines) of neuroimaging studies employing functional magnetic resonance imaging and diffusion tensor imaging methods investigating the physiological substrates of EFs in attention-deficit/hyperactivity disorder compared to other clinical groups and non-clinical participants. Research articles were retrieved using PsycINFO, PsycARTICLES, MEDLINE, and ScienceDirect, beginning February 2015 through May 2016. A total of 42 studies met eligibility. Of those 42 studies, 22 studies included clinical participants and 20 studies included non-clinical participants. Results revealed increased activation of the frontal brain region in the majority of non-clinical studies and approximately 50% of the clinical studies, albeit with some inconsistencies across subregions, tasks, and age groups. Implications, methodological limitations, and suggestions for future research are discussed.
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Affiliation(s)
- Bailey A Munro
- Interdisciplinary Neuroscience Program, University of Rhode Island, Chafee Hall, 10 Chafee Road, Kingston, RI, 02881, USA.
| | - Lisa L Weyandt
- Interdisciplinary Neuroscience Program, University of Rhode Island, Chafee Hall, 10 Chafee Road, Kingston, RI, 02881, USA
| | - Lily E Hall
- Department of Psychology, University of Rhode Island, Kingston, RI, USA
| | - Danielle R Oster
- Department of Psychology, University of Rhode Island, Kingston, RI, USA
| | | | - Benjamin G Kuhar
- Department of Psychology, University of Rhode Island, Kingston, RI, USA
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11
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van der Meer D, Hartman CA, van Rooij D, Franke B, Heslenfeld DJ, Oosterlaan J, Faraone SV, Buitelaar JK, Hoekstra PJ. Effects of dopaminergic genes, prenatal adversities, and their interaction on attention-deficit/hyperactivity disorder and neural correlates of response inhibition. J Psychiatry Neurosci 2017; 42:113-121. [PMID: 28234207 PMCID: PMC5373700 DOI: 10.1503/jpn.150350] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
BACKGROUND Attention-deficit/hyperactivity disorder (ADHD) is often accompanied by impaired response inhibition; both have been associated with aberrant dopamine signalling. Given that prenatal exposure to alcohol or smoking is known to affect dopamine-rich brain regions, we hypothesized that individuals carrying the ADHD risk alleles of the dopamine receptor D4 (DRD4) and dopamine transporter (DAT1) genes may be especially sensitive to their effects. METHODS Functional MRI data, information on prenatal adversities and genetic data were available for 239 adolescents and young adults participating in the multicentre ADHD cohort study NeuroIMAGE (average age 17.3 yr). We analyzed the effects of DRD4 and DAT1, prenatal exposure to alcohol and smoking and their interactions on ADHD severity, response inhibition and neural activity. RESULTS We found no significant gene × environment interaction effects. We did find that the DRD4 7-repeat allele was associated with less superior frontal and parietal brain activity and with greater activity in the frontal pole and occipital cortex. Prenatal exposure to smoking was also associated with lower superior frontal activity, but with greater activity in the parietal lobe. Further, those exposed to alcohol had more activity in the lateral orbitofrontal cortex, and the DAT1 risk variant was associated with lower cerebellar activity. LIMITATIONS Retrospective reports of maternal substance use and the cross-sectional study design restrict causal inference. CONCLUSION While we found no evidence of gene × environment interactions, the risk factors under investigation influenced activity of brain regions associated with response inhibition, suggesting they may add to problems with inhibiting behaviour.
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Affiliation(s)
- Dennis van der Meer
- Correspondence to: D. van der Meer, University of Groningen, University Medical Center Groningen, Department of Child and Adolescent Psychiatry, 9700 RB Groningen, The Netherlands;
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Sattin D, Lovaglio P, Brenna G, Covelli V, Rossi Sebastiano D, Duran D, Minati L, Giovannetti AM, Rosazza C, Bersano A, Nigri A, Ferraro S, Leonardi M. A comparative study on assessment procedures and metric properties of two scoring systems of the Coma Recovery Scale-Revised items: standard and modified scores. Clin Rehabil 2017; 31:1226-1237. [DOI: 10.1177/0269215517694225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective: The study compared the metric characteristics (discriminant capacity and factorial structure) of two different methods for scoring the items of the Coma Recovery Scale-Revised and it analysed scale scores collected using the standard assessment procedure and a new proposed method. Design: Cross sectional design/methodological study. Setting: Inpatient, neurological unit. Participants: A total of 153 patients with disorders of consciousness were consecutively enrolled between 2011 and 2013. Intervention: All patients were assessed with the Coma Recovery Scale-Revised using standard (rater 1) and inverted (rater 2) procedures. Main outcome measures: Coma Recovery Scale-Revised score, number of cognitive and reflex behaviours and diagnosis. Results: Regarding patient assessment, rater 1 using standard and rater 2 using inverted procedures obtained the same best scores for each subscale of the Coma Recovery Scale-Revised for all patients, so no clinical (and statistical) difference was found between the two procedures. In 11 patients (7.7%), rater 2 noted that some Coma Recovery Scale-Revised codified behavioural responses were not found during assessment, although higher response categories were present. A total of 51 (36%) patients presented the same Coma Recovery Scale-Revised scores of 7 or 8 using a standard score, whereas no overlap was found using the modified score. Unidimensionality was confirmed for both score systems. Conclusion: The Coma Recovery Scale Modified Score showed a higher discriminant capacity than the standard score and a monofactorial structure was also supported. The inverted assessment procedure could be a useful evaluation method for the assessment of patients with disorder of consciousness diagnosis.
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Affiliation(s)
- Davide Sattin
- Neurology, Public Health, Disability Unit and Coma Research Centre, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Piergiorgio Lovaglio
- Department of Statistics and Quantitative Methods, University Bicocca-Milan, Milan, Italy
| | - Greta Brenna
- Scientific Directorate, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Venusia Covelli
- Department of Psychology, e-Campus University, Novedrate (CO), Italy
| | - Davide Rossi Sebastiano
- Neurophysiology and Diagnostic Epileptology Unit, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Dunja Duran
- Neurophysiology and Diagnostic Epileptology Unit, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Ludovico Minati
- Scientific Directorate, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Ambra Mara Giovannetti
- Neurology, Public Health, Disability Unit and Coma Research Centre, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Cristina Rosazza
- Scientific Directorate, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Anna Bersano
- Neurology Unit, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Anna Nigri
- Neuroradiology Unit, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Stefania Ferraro
- Neuroradiology Unit, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
| | - Matilde Leonardi
- Neurology, Public Health, Disability Unit and Coma Research Centre, Neurological Institute C. Besta IRCCS Foundation, Milan, Italy
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Bonaventura J, Quiroz C, Cai NS, Rubinstein M, Tanda G, Ferré S. Key role of the dopamine D 4 receptor in the modulation of corticostriatal glutamatergic neurotransmission. SCIENCE ADVANCES 2017; 3:e1601631. [PMID: 28097219 PMCID: PMC5226642 DOI: 10.1126/sciadv.1601631] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 11/29/2016] [Indexed: 06/06/2023]
Abstract
Polymorphic variants of the dopamine D4 receptor gene (DRD4) have been repeatedly associated with numerous neuropsychiatric disorders. Yet, the functional role of the D4 receptor and the functional differences of the products of DRD4 polymorphic variants remained enigmatic. Immunohistochemical and optogenetic-microdialysis experiments were performed in knock-in mice expressing a D4 receptor with the long intracellular domain of a human DRD4 polymorphic variant associated with attention deficit hyperactivity disorder (ADHD). When compared with the wild-type mouse D4 receptor, the expanded intracellular domain of the humanized D4 receptor conferred a gain of function, blunting methamphetamine-induced cortical activation and optogenetic and methamphetamine-induced corticostriatal glutamate release. The results demonstrate a key role of the D4 receptor in the modulation of corticostriatal glutamatergic neurotransmission. Furthermore, these data imply that enhanced D4 receptor-mediated dopaminergic control of corticostriatal transmission constitutes a vulnerability factor of ADHD and other neuropsychiatric disorders.
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Affiliation(s)
- Jordi Bonaventura
- Integrative Neurobiology Section, National Institute on Drug Abuse, Intramural research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - César Quiroz
- Integrative Neurobiology Section, National Institute on Drug Abuse, Intramural research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Ning-Sheng Cai
- Integrative Neurobiology Section, National Institute on Drug Abuse, Intramural research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Marcelo Rubinstein
- Institute of Investigation in Genetic Engineering and Molecular Biology, Buenos Aires 1428, Argentina
| | - Gianluigi Tanda
- Medications Development Program, National Institute on Drug Abuse, Intramural research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Sergi Ferré
- Integrative Neurobiology Section, National Institute on Drug Abuse, Intramural research Program, National Institutes of Health, Baltimore, MD 21224, USA
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14
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Vilor-Tejedor N, Cáceres A, Pujol J, Sunyer J, González JR. Imaging genetics in attention-deficit/hyperactivity disorder and related neurodevelopmental domains: state of the art. Brain Imaging Behav 2016; 11:1922-1931. [DOI: 10.1007/s11682-016-9663-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Schweren LJS, Hartman CA, Heslenfeld DJ, Groenman AP, Franke B, Oosterlaan J, Buitelaar JK, Hoekstra PJ. Age and DRD4 Genotype Moderate Associations Between Stimulant Treatment History and Cortex Structure in Attention-Deficit/Hyperactivity Disorder. J Am Acad Child Adolesc Psychiatry 2016; 55:877-885.e3. [PMID: 27663943 DOI: 10.1016/j.jaac.2016.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 06/16/2016] [Accepted: 07/26/2016] [Indexed: 01/13/2023]
Abstract
OBJECTIVE Attention-deficit/hyperactivity disorder (ADHD) has been associated with dopaminergic imbalance and subtle volume decreases in the brain. Stimulants acutely enhance dopaminergic neurotransmission. Long-term effects of prolonged manipulation of the dopaminergic system on brain structure remain poorly understood; they could be beneficial or unfavorable and could be moderated by common genetic variants and/or age. METHOD In a large observational ADHD cohort study (N = 316), the effects of cumulative stimulant treatment, genotype (for DAT1 haplotype and DRD4 variants), and treatment-by-genotype interactions on striatal, frontal, and hippocampal volumes and their interactions with age were evaluated. RESULTS No main effects of treatment were found. Associations between treatment and bilateral frontal and left hippocampal volume depended on DRD4 genotype and age. At a younger age and lower treatment levels, but not at a younger age and higher treatment levels, carriers of the DRD4 7R allele showed decreased frontal cortex volumes. At an older age, carriers and non-carriers showed smaller frontal volumes irrespective of treatment history. Left hippocampal volume was similar to that in controls at average treatment levels and increased with treatment only in carriers of the DRD4 risk allele and at a younger age. No interaction effects were found in the striatum. CONCLUSION Carriers of the DRD4 risk allele at a younger age might be sensitive to cortical remodeling after stimulant treatment. The cross-sectional nature of this study warrants cautious interpretation of age effects. The present findings, although of small effect size, might ultimately contribute to optimal care for individuals with ADHD.
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Affiliation(s)
- Lizanne J S Schweren
- University of Groningen and University Medical Center Groningen, Groningen, the Netherlands.
| | - Catharina A Hartman
- University of Groningen and University Medical Center Groningen, Groningen, the Netherlands
| | | | | | - Barbara Franke
- Radboud University Medical Center, Donders Institute for Brain, Cognition and Behavior, Nijmegen, the Netherlands
| | | | - Jan K Buitelaar
- Radboud University Medical Center, Donders Institute for Brain, Cognition and Behavior, Nijmegen, the Netherlands; Karakter Child and Adolescent Psychiatry University Center
| | - Pieter J Hoekstra
- University of Groningen and University Medical Center Groningen, Groningen, the Netherlands
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Gu-Cai L, Ru Z, Jiao-yun X. Synthesis and in vitro evaluation of no-carrier-added 2-(3-(4-(4-[18F]fluorobenzyl)piperazin-1-yl)propyl)benzo[d]thiazole, a potential dopamine D4 receptor radioligand. RADIOCHIM ACTA 2016. [DOI: 10.1515/ract-2016-2597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The dopamine D4 receptor has been shown to play important roles in some central nervous system pathologies. Specific radioligands for the D4 receptor may be useful to understand the function of the D4 receptor and its correlations with various disorders. 2-(3-(4-(4-[18F]Fluorobenzyl)piperazin-1-yl)propyl)benzo[d]thiazole ([18F]4) was synthesized through a one-pot two-step procedure with total yield 18.6% (decay corrected). The specific activity of the radioligand was 112 GBq/μmol and its radiochemical purity was >95.0%. Its affinity and selectivity for dopamine D2-like receptors were measured through in vitro receptor binding evaluation and the K
i value for the D4 receptor was determined to be 2.9±0.2 nM, and its selectivity for the dopamine D4 receptor is 709-fold versus D2long receptor, 823-fold versus D3 receptor. The partition coefficient (Log D) of it was determined to be 2.6±0.1 through octanol-water partition experiment. The ligand presents desirable combination of lipophilicity, affinity and selectivity for the dopamine D4 receptor. The results suggested that the radioligand shows promises for the in vivo study of the dopamine D4 receptor.
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Affiliation(s)
- Li Gu-Cai
- College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Hunan Xiangtan, 411104, China
| | - Zhang Ru
- College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Hunan Xiangtan, 411104, China
| | - Xia Jiao-yun
- School of Chemistry and Biology Engineering, Changsha University of Science and Technology, 410114, China
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Beck SM, Ruge H, Schindler C, Burkart M, Miller R, Kirschbaum C, Goschke T. Effects of Ginkgo biloba extract EGb 761® on cognitive control functions, mental activity of the prefrontal cortex and stress reactivity in elderly adults with subjective memory impairment - a randomized double-blind placebo-controlled trial. Hum Psychopharmacol 2016; 31:227-42. [PMID: 27147264 PMCID: PMC5084772 DOI: 10.1002/hup.2534] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 02/24/2016] [Accepted: 03/10/2016] [Indexed: 02/05/2023]
Abstract
OBJECTIVE Cognitive control as well as stress reactivity is assumed to depend on prefrontal dopamine and decline with age. Because Ginkgo biloba extract EGb761 increases prefrontal dopamine in animals, we assessed its effects on cognitive functions related to prefrontal dopamine. METHODS Effects of 240-mg EGb761 daily on task-set-switching, response-inhibition, delayed response, prospective-memory, task-related fMRI-BOLD-signals and the Trier Social Stress-Test were explored in a randomized, placebo-controlled, double-blind pilot-trial in 61 elderly volunteers with subjective memory impairment. RESULTS Baseline-FMRI-data showed BOLD-responses in regions commonly activated by the specific tasks. Task-switch-costs decreased with EGb761 compared to placebo (ANOVA-interaction: Group × Time × Switch-Costs p = 0.018, multiple tests uncorrected), indicating improved cognitive flexibility. Go-NoGo-task reaction-times corrected for error-rates indicated a trend for improved response inhibition. No treatment effects were found for the delayed response and prospective-memory tasks and fMRI-data. A non-significant trend indicated a potentially accelerated endocrine stress-recovery. EGb761 was safe and well tolerated. CONCLUSION We observed indications for improved cognitive flexibility without changes in brain activation, suggesting increased processing efficiency with EGb761. Together with a trend for improved response inhibition results are compatible with mild enhancement of prefrontal dopamine. These conclusions on potential beneficial effect of EGb761 on prefrontal dopaminergic functions should be confirmed by direct measurements. © 2016 The Authors. Human Psychopharmacology: Clinical and Experimental published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Stefanie M. Beck
- Department of PsychologyTechnische Universität DresdenDresdenGermany,Neuroimaging CentreTechnische Universität DresdenDresdenGermany
| | - Hannes Ruge
- Department of PsychologyTechnische Universität DresdenDresdenGermany,Neuroimaging CentreTechnische Universität DresdenDresdenGermany
| | - Christoph Schindler
- Institute for Clinical Pharmacology, Faculty of Medicine Carl Gustav CarusTechnische Universität DresdenDresdenGermany,Clinical Research Center Hannover & Institute for Clinical PharmacologyHannover Medical SchoolHannoverGermany
| | | | - Robert Miller
- Department of PsychologyTechnische Universität DresdenDresdenGermany
| | | | - Thomas Goschke
- Department of PsychologyTechnische Universität DresdenDresdenGermany,Neuroimaging CentreTechnische Universität DresdenDresdenGermany
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van Wouwe NC, Kanoff KE, Claassen DO, Spears CA, Neimat J, van den Wildenberg WPM, Wylie SA. Dissociable Effects of Dopamine on the Initial Capture and the Reactive Inhibition of Impulsive Actions in Parkinson's Disease. J Cogn Neurosci 2016; 28:710-23. [PMID: 26836515 DOI: 10.1162/jocn_a_00930] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Dopamine plays a key role in a range of action control processes. Here, we investigate how dopamine depletion caused by Parkinson disease (PD) and how dopamine restoring medication modulate the expression and suppression of unintended action impulses. Fifty-five PD patients and 56 healthy controls (HCs) performed an action control task (Simon task). PD patients completed the task twice, once withdrawn from dopamine medications and once while taking their medications. PD patients experienced similar susceptibility to making fast errors in conflict trials as HCs, but PD patients were less proficient compared with HCs at suppressing incorrect responses. Administration of dopaminergic medications had no effect on impulsive error rates but significantly improved the proficiency of inhibitory control in PD patients. We found no evidence that dopamine precursors and agonists affected action control in PD differently. Additionally, there was no clear evidence that individual differences in baseline action control (off dopamine medications) differentially responded to dopamine medications (i.e., no evidence for an inverted U-shaped performance curve). Together, these results indicate that dopamine depletion and restoration therapies directly modulate the reactive inhibitory control processes engaged to suppress interference from the spontaneously activated response impulses but exert no effect on an individual's susceptibility to act on impulses.
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Tomlinson A, Grayson B, Marsh S, Hayward A, Marshall KM, Neill JC. Putative therapeutic targets for symptom subtypes of adult ADHD: D4 receptor agonism and COMT inhibition improve attention and response inhibition in a novel translational animal model. Eur Neuropsychopharmacol 2015; 25:454-67. [PMID: 25799918 DOI: 10.1016/j.euroneuro.2014.11.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 10/17/2014] [Accepted: 11/24/2014] [Indexed: 02/01/2023]
Abstract
Prefrontal cortical dopamine plays an important role in cognitive control, specifically in attention and response inhibition; the core deficits in ADHD. We have previously shown that methylphenidate and atomoxetine differentially improve these deficits dependent on baseline performance. The present study extends this work to investigate the effects of putative therapeutic targets in our model. A selective dopamine D4 receptor agonist (A-412997) and the catechol-O-methyl-transferase (COMT) inhibitor; tolcapone, were investigated in the combined subtype of adult ADHD (ADHD-C). Adult female rats were trained to criterion in the 5C-CPT (5-Choice Continuous Performance Task) and then separated into subgroups according to baseline levels of sustained attention, vigilance, and response disinhibition. The subgroups included: high-attentive (HA) and low-attentive with high response disinhibition (ADHD-C). The ADHD-C subgroup was selected to represent the combined subtype of adult ADHD. Effects of tolcapone (3.0, 10.0, 15.0mg/kg) and A-412997 (0.1, 0.3, 1.0µmol/kg) were tested by increasing the variable inter-trial-interval (ITI) duration in the 5C-CPT. Tolcapone (15mg/kg) significantly increased sustained attention, vigilance and response inhibition in ADHD-C animals, and impaired attention in HA animals. A-412997 (1.0µmol/kg) significantly increased vigilance and response inhibition in ADHD-C animals only, with no effect in HA animals. This is the first study to use the translational 5C-CPT to model the adult ADHD-C subtype in rats and to study new targets in this model. Both tolcapone and A-412997 increased vigilance and response inhibition in the ADHD-C subgroup. D4 and COMT are emerging as important potential therapeutic targets in adult ADHD that warrant further investigation.
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Affiliation(s)
- Anneka Tomlinson
- Manchester Pharmacy School, University of Manchester, Oxford Rd, Manchester M13 9PT, UK.
| | - Ben Grayson
- Manchester Pharmacy School, University of Manchester, Oxford Rd, Manchester M13 9PT, UK
| | - Samuel Marsh
- Manchester Pharmacy School, University of Manchester, Oxford Rd, Manchester M13 9PT, UK
| | - Andrew Hayward
- Manchester Pharmacy School, University of Manchester, Oxford Rd, Manchester M13 9PT, UK
| | - Kay M Marshall
- Manchester Pharmacy School, University of Manchester, Oxford Rd, Manchester M13 9PT, UK
| | - Joanna C Neill
- Manchester Pharmacy School, University of Manchester, Oxford Rd, Manchester M13 9PT, UK.
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