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Parlatini V, Bellato A, Roy S, Murphy D, Cortese S. Association Between Single-Dose and Longer Term Clinical Response to Stimulants in Attention-Deficit/Hyperactivity Disorder: A Systematic Review of Randomized Controlled Trials. J Child Adolesc Psychopharmacol 2024; 34:337-345. [PMID: 39027968 DOI: 10.1089/cap.2024.0038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
Objectives: Stimulants, such as methylphenidate (MPH) and amphetamines, represent the first-line pharmacological option for attention-deficit/hyperactivity disorder (ADHD). Randomized controlled trials (RCTs) have demonstrated beneficial effects at a group level but could not identify characteristics consistently associated with varying individual response. Thus, more individualized approaches are needed. Experimental studies have suggested that the neurobiological response to a single dose is indicative of longer term response. It is unclear whether this also applies to clinical measures. Methods: We carried out a systematic review of RCTs testing the association between the clinical response to a single dose of stimulants and longer term improvement. Potentially suitable single-dose RCTs were identified from the MED-ADHD data set, the European ADHD Guidelines Group RCT Data set (https://med-adhd.org/), as updated on February 1, 2024. Quality assessment was carried out using the Cochrane Risk of Bias (RoB) 2.0 tool. Results: A total of 63 single-dose RCTs (94% testing MPH, 85% in children) were identified. Among these, only a secondary analysis of an RCT tested the association between acute and longer term clinical response. This showed that the clinical improvement after a single dose of MPH was significantly associated with symptom improvement after a 4-week MPH treatment in 46 children (89% males) with ADHD. The risk of bias was rated as moderate. A further RCT used near-infrared spectroscopy, thus did not meet the inclusion criteria, and reported an association between brain changes under a single-dose and longer term clinical response in 22 children (82% males) with ADHD. The remaining RCTs only reported single-dose effects on neuropsychological, neuroimaging, or neurophysiological measures. Conclusion: This systematic review highlighted an important gap in the current knowledge. Investigating how acute and long-term response may be related can foster our understanding of stimulant mechanism of action and help develop stratification approaches for more tailored treatment strategies. Future studies need to investigate potential age- and sex-related differences.
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Affiliation(s)
- Valeria Parlatini
- School of Psychology, University of Southampton, Southampton, United Kingdom
- Centre for Innovation in Mental Health, University of Southampton, Southampton, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom
- Institute of Translational Neurodevelopment, Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Solent NHS Trust, Southampton, United Kingdom
| | - Alessio Bellato
- School of Psychology, University of Southampton, Southampton, United Kingdom
- Centre for Innovation in Mental Health, University of Southampton, Southampton, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom
- School of Psychology, University of Nottingham, Semenyih, Malaysia
- Mind and Neurodevelopment (MiND) Research Group, University of Nottingham, Semenyih, Malaysia
| | - Sulagna Roy
- School of Psychology, University of Southampton, Southampton, United Kingdom
- Centre for Innovation in Mental Health, University of Southampton, Southampton, United Kingdom
| | - Declan Murphy
- Institute of Translational Neurodevelopment, Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Samuele Cortese
- School of Psychology, University of Southampton, Southampton, United Kingdom
- Centre for Innovation in Mental Health, University of Southampton, Southampton, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom
- Solent NHS Trust, Southampton, United Kingdom
- Faculty of Medicine, Clinical and Experimental Sciences (CNS and Psychiatry), University of Southampton, Southampton, United Kingdom
- Hassenfeld Children's Hospital at NYU Langone, New York University Child Study Center, New York, New York, USA
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Parlatini V, Bellato A, Murphy D, Cortese S. From neurons to brain networks, pharmacodynamics of stimulant medication for ADHD. Neurosci Biobehav Rev 2024; 164:105841. [PMID: 39098738 DOI: 10.1016/j.neubiorev.2024.105841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 07/25/2024] [Accepted: 08/01/2024] [Indexed: 08/06/2024]
Abstract
Stimulants represent the first line pharmacological treatment for attention-deficit/hyperactivity disorder (ADHD) and are among the most prescribed psychopharmacological treatments. Their mechanism of action at synaptic level has been extensively studied. However, it is less clear how their mechanism of action determines clinically observed benefits. To help bridge this gap, we provide a comprehensive review of stimulant effects, with an emphasis on nuclear medicine and magnetic resonance imaging (MRI) findings. There is evidence that stimulant-induced modulation of dopamine and norepinephrine neurotransmission optimizes engagement of task-related brain networks, increases perceived saliency, and reduces interference from the default mode network. An acute administration of stimulants may reduce brain alterations observed in untreated individuals in fronto-striato-parieto-cerebellar networks during tasks or at rest. Potential effects of prolonged treatment remain controversial. Overall, neuroimaging has fostered understanding on stimulant mechanism of action. However, studies are often limited by small samples, short or no follow-up, and methodological heterogeneity. Future studies should address age-related and longer-term effects, potential differences among stimulants, and predictors of treatment response.
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Affiliation(s)
- Valeria Parlatini
- School of Psychology, University of Southampton, Southampton, United Kingdom; Centre for Innovation in Mental Health, University of Southampton, Southampton, United Kingdom; Institute for Life Sciences, University of Southampton, Southampton, United Kingdom; Institute of Translational Neurodevelopment, Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, United Kingdom; Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, United Kingdom; Solent NHS Trust, Southampton, United Kingdom.
| | - Alessio Bellato
- School of Psychology, University of Southampton, Southampton, United Kingdom; Centre for Innovation in Mental Health, University of Southampton, Southampton, United Kingdom; Institute for Life Sciences, University of Southampton, Southampton, United Kingdom; Solent NHS Trust, Southampton, United Kingdom; School of Psychology, University of Nottingham, Semenyih, Malaysia
| | - Declan Murphy
- Institute of Translational Neurodevelopment, Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, United Kingdom; Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, United Kingdom
| | - Samuele Cortese
- School of Psychology, University of Southampton, Southampton, United Kingdom; Centre for Innovation in Mental Health, University of Southampton, Southampton, United Kingdom; Institute for Life Sciences, University of Southampton, Southampton, United Kingdom; Solent NHS Trust, Southampton, United Kingdom; Mind and Neurodevelopment (MiND) Research Group, University of Nottingham, Semenyih, Malaysia; Clinical and Experimental Sciences (CNS and Psychiatry), Faculty of Medicine, University of Southampton, Southampton, United Kingdom; Hassenfeld Children's Hospital at NYU Langone, New York University Child Study Center, New York, NY, USA
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3
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Senkowski D, Ziegler T, Singh M, Heinz A, He J, Silk T, Lorenz RC. Assessing Inhibitory Control Deficits in Adult ADHD: A Systematic Review and Meta-analysis of the Stop-signal Task. Neuropsychol Rev 2024; 34:548-567. [PMID: 37300725 PMCID: PMC11166755 DOI: 10.1007/s11065-023-09592-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 03/21/2023] [Indexed: 06/12/2023]
Abstract
In recent years, there has been an increasing quest in improving our understanding of the neurocognitive deficits underlying adult attention-deficit/hyperactivity disorder (ADHD). Current statistical manuals of psychiatric disorders emphasize inattention and hyperactivity-impulsivity symptoms, but empirical studies have also shown consistent alterations in inhibitory control. To date, there is no established neuropsychological test to assess inhibitory control deficits in adult ADHD. A common paradigm for assessing response inhibition is the stop-signal task (SST). Following PRISMA-selection criteria, our systematic review and meta-analysis integrated the findings of 26 publications with 27 studies examining the SST in adult ADHD. The meta-analysis, which included 883 patients with adult ADHD and 916 control participants, revealed reliable inhibitory control deficits, as expressed in prolonged SST response times, with a moderate effect size g = 0.51 (95% CI: 0.376-0.644, p < 0.0001). The deficits were not moderated by study quality, sample characteristics or clinical parameters, suggesting that they may be a phenotype in this disorder. The analyses of secondary outcome measures revealed greater SST omission errors and reduced go accuracy in patients, indicative of altered sustained attention. However, only few (N < 10) studies were available for these measures. Our meta-analysis suggests that the SST, in conjunction with other tests and questionnaires, could become a valuable tool for assessing inhibitory control deficits in adult ADHD.
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Affiliation(s)
- Daniel Senkowski
- Department of Psychiatry and Neurosciences, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität Zu Berlin, Charité Campus Mitte (CCM), Charitéplatz 1, 10117, Berlin, Germany.
| | - Theresa Ziegler
- Department of Psychiatry and Neurosciences, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität Zu Berlin, Charité Campus Mitte (CCM), Charitéplatz 1, 10117, Berlin, Germany
| | - Mervyn Singh
- Centre for Social and Early Emotional Development (SEED) and School of Psychology, Deakin University, Geelong, Victoria, Australia
| | - Andreas Heinz
- Department of Psychiatry and Neurosciences, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität Zu Berlin, Charité Campus Mitte (CCM), Charitéplatz 1, 10117, Berlin, Germany
| | - Jason He
- King's College London, London, WC2R 2LS, UK
| | - Tim Silk
- Centre for Social and Early Emotional Development (SEED) and School of Psychology, Deakin University, Geelong, Victoria, Australia
| | - Robert C Lorenz
- Lise Meitner Group for Environmental Neuroscience, Max Planck Institute for Human Development, Lentzeallee 94, 14195, Berlin, Germany
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Jian-Min C, Zhi-Yuan W, Ke L, Cheng Z, Shi-Xuan W, Yi-Wei C, Guan-Yi L, Rui S, Xiao-Mei Z, Jin L, Ning W. Assessment of lisdexamfetamine on executive function in rats: A translational cognitive research. Exp Neurol 2024; 374:114718. [PMID: 38336285 DOI: 10.1016/j.expneurol.2024.114718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 01/13/2024] [Accepted: 02/06/2024] [Indexed: 02/12/2024]
Abstract
Executive function, including working memory, attention and inhibitory control, is crucial for decision making, thinking and planning. Lisdexamfetamine, the prodrug of d-amphetamine, has been approved for treating attention-deficit hyperactivity disorder and binge eating disorder, but whether it improves executive function under non-disease condition, as well as the underlying pharmacokinetic and neurochemical properties, remains unclear. Here, using trial unique non-matching to location task and five-choice serial reaction time task of rats, we found lisdexamfetamine (p.o) enhanced spatial working memory and sustained attention under various cognitive load conditions, while d-amphetamine (i.p) only improved these cognitive performances under certain high cognitive load condition. Additionally, lisdexamfetamine evoked less impulsivity than d-amphetamine, indicating lower adverse effect on inhibitory control. In vivo pharmacokinetics showed lisdexamfetamine produced a relative stable and lasting release of amphetamine base both in plasma and in brain tissue, whereas d-amphetamine injection elicited rapid increase and dramatical decrease in amphetamine base levels. Microdialysis revealed lisdexamfetamine caused lasting release of dopamine within the medial prefrontal cortex (mPFC), whereas d-amphetamine produced rapid increase followed by decline to dopamine level. Moreover, lisdexamfetamine elicited more obvious efflux of noradrenaline than that of d-amphetamine. The distinct neurochemical profiles may be partly attributed to the different action of two drugs to membranous catecholamine transporters level within mPFC, detecting by Western Blotting. Taken together, due to its certain pharmacokinetic and catecholamine releasing profiles, lisdexamfetamine produced better pharmacological action to improving executive function. Our finding provided valuable evidence on the ideal pharmacokinetic and neurochemical characteristics of amphetamine-type psychostimulants in cognition enhancement.
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Affiliation(s)
- Chen Jian-Min
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China; Department of Pharmacy, Nanxishan Hospital of Guangxi Zhuang Autonomous Region, 46th Chongxin Road, Guilin 541000, China
| | - Wang Zhi-Yuan
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Liu Ke
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Zhang Cheng
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Wu Shi-Xuan
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Cao Yi-Wei
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Lu Guan-Yi
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Song Rui
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Zhuang Xiao-Mei
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China.
| | - Li Jin
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China
| | - Wu Ning
- Beijing Key Laboratory of Neuropsychopharmacology, State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, 27th Taiping Road, Beijing 100850, China.
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5
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Urueña-Méndez G, Dimiziani A, Bellés L, Goutaudier R, Ginovart N. Repeated Cocaine Intake Differentially Impacts Striatal D 2/3 Receptor Availability, Psychostimulant-Induced Dopamine Release, and Trait Behavioral Markers of Drug Abuse. Int J Mol Sci 2023; 24:13238. [PMID: 37686044 PMCID: PMC10487888 DOI: 10.3390/ijms241713238] [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] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 08/17/2023] [Accepted: 08/23/2023] [Indexed: 09/10/2023] Open
Abstract
Current research indicates that altered dopamine (DA) transmission in the striatum contributes to impulsivity and novelty-seeking, and it may mediate a link concerning a higher susceptibility to drug abuse. Whether increased susceptibility to drug abuse results from a hyperdopaminergic or hypodopaminergic state is still debated. Here, we simultaneously tracked changes in DA D2/3 receptor (D2/3R) availability and amphetamine-(AMPH)-induced DA release in relation to impulsivity and novelty-seeking prior to, and following, cocaine self-administration (SA) in Roman high- (RHA) and low- (RLA) avoidance rats. We found that high-impulsive/high novelty-seeking RHA rats exhibited lower D2/3R availabilities and higher AMPH-induced DA release in the striatum that predicted higher levels of cocaine intake compared with RLAs. Cocaine SA did not alter striatal D2/3R availability or impulsivity in RHA or RLA rats. Critically, cocaine exposure led to a baseline-dependent blunting of stimulated DA release in high-impulsive/high novelty-seeking RHA rats only, and to a baseline-dependent increase in novelty-seeking in low-impulsive/low novelty-seeking RLA rats only. Altogether, we propose that susceptibility to drug abuse results from an innate hyper-responsive DA system, promoting impulsive action and novelty-seeking, and producing stronger initial drug-reinforcing effects that contribute to the initiation and perpetuation of drug use. However, with repeated cocaine use, a tolerance to drug-induced striatal DA elevations develops, leading to a compensatory increase in drug consumption to overcome the reduced reward effects.
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Affiliation(s)
- Ginna Urueña-Méndez
- Department of Psychiatry, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland; (G.U.-M.); (L.B.); (R.G.)
- Department of Basic Neurosciences, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
| | - Andrea Dimiziani
- Department of Psychiatry, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland; (G.U.-M.); (L.B.); (R.G.)
| | - Lidia Bellés
- Department of Psychiatry, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland; (G.U.-M.); (L.B.); (R.G.)
- Department of Basic Neurosciences, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
| | - Raphaël Goutaudier
- Department of Psychiatry, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland; (G.U.-M.); (L.B.); (R.G.)
- Department of Basic Neurosciences, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
| | - Nathalie Ginovart
- Department of Psychiatry, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland; (G.U.-M.); (L.B.); (R.G.)
- Department of Basic Neurosciences, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland
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Yamamoto M, Inada T. Positron emission tomography studies in adult patients with attention-deficit/hyperactivity disorder. Jpn J Radiol 2022; 41:382-392. [PMID: 36480104 DOI: 10.1007/s11604-022-01368-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 11/28/2022] [Indexed: 12/13/2022]
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by inattention, motor hyperactivity, impulsivity, and psychosocial as well as cognitive dysfunction. Although characteristic clinical manifestations have been described, no definitive biomarkers to diagnose ADHD have been established. In this review article, we summarize positron emission tomography (PET) studies conducted in adult patients with ADHD. We found that, although, disturbances of dopamine, serotonin, and norepinephrine functions have been implicated in ADHD, no characteristic findings have been identified from PET studies in patients with ADHD. Several previous PET studies on the central dopaminergic transmission-related ligands in patients with ADHD have shown altered binding of dopamine markers in the basal ganglia. However, no consistent results were observed in the binding characteristics for dopamine transporters and receptors. Findings from PET studies with ligands related to serotonin and norepinephrine pathways showed either unclear clinical significance or low replicability. Therefore, whether alterations of monoamine function may be involved in the pathophysiological mechanism remains to be clarified. The limitations of previous PET studies include their small sample sizes, focus on several kinds of existing ligands, and a questionable validity of the diagnosis (lack of biological diagnostic criteria). To determine the characteristic findings for diagnosing ADHD, further research is needed, and particularly, studies that evaluate new active ligands with specific binding to monoamine pathways should be undertaken.
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Affiliation(s)
- Maeri Yamamoto
- Department of Psychiatry, Nagoya University Hospital, 65 Tsurumai-Cho, Showa-Ku, Nagoya-Shi, Aichi, 466-8560, Japan
| | - Toshiya Inada
- Department of Psychiatry, Graduate School of Medicine, Nagoya University, 65 Tsurumai-Cho, Showa-Ku, Nagoya-Shi, Aichi, 466-8550, Japan.
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Kaiser A, Broeder C, Cohen JR, Douw L, Reneman L, Schrantee A. Effects of a single-dose methylphenidate challenge on resting-state functional connectivity in stimulant-treatment naive children and adults with ADHD. Hum Brain Mapp 2022; 43:4664-4675. [PMID: 35781371 PMCID: PMC9491277 DOI: 10.1002/hbm.25981] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/17/2022] [Accepted: 05/27/2022] [Indexed: 11/09/2022] Open
Abstract
Prior studies suggest that methylphenidate, the primary pharmacological treatment for attention-deficit/hyperactivity disorder (ADHD), alters functional brain connectivity. As the neurotransmitter systems targeted by methylphenidate undergo significant alterations throughout development, the effects of methylphenidate on functional connectivity may also be modulated by age. Therefore, we assessed the effects of a single methylphenidate challenge on brain network connectivity in stimulant-treatment naïve children and adults with ADHD. We obtained resting-state functional MRI from 50 boys (10-12 years of age) and 49 men (23-40 years of age) with ADHD (DSM IV, all subtypes), before and after an oral challenge with 0.5 mg/kg methylphenidate; and from 11 boys and 12 men as typically developing controls. Connectivity strength (CS), eigenvector centrality (EC), and betweenness centrality (BC) were calculated for the striatum, thalamus, dorsal anterior cingulate cortex (dACC), and prefrontal cortex (PFC). In line with our hypotheses, we found that methylphenidate decreased measures of connectivity and centrality in the striatum and thalamus in children with ADHD, but increased the same metrics in adults with ADHD. Surprisingly, we found no major effects of methylphenidate in the dACC and PFC in either children or adults. Interestingly, pre-methylphenidate, participants with ADHD showed aberrant connectivity and centrality compared to controls predominantly in frontal regions. Our findings demonstrate that methylphenidate's effects on connectivity of subcortical regions are age-dependent in stimulant-treatment naïve participants with ADHD, likely due to ongoing maturation of dopamine and noradrenaline systems. These findings highlight the importance for future studies to take a developmental perspective when studying the effects of methylphenidate treatment.
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Affiliation(s)
- Antonia Kaiser
- Department of Radiology and Nuclear Medicine, Amsterdam Neuroscience, Amsterdam UMCUniversity of AmsterdamAmsterdamThe Netherlands
| | - Caroline Broeder
- Department of Radiology and Nuclear Medicine, Amsterdam Neuroscience, Amsterdam UMCUniversity of AmsterdamAmsterdamThe Netherlands
| | - Jessica R. Cohen
- Department of Psychology and NeuroscienceUniversity of North Carolina at Chapel HillChapel HillNorth CarolinaUSA
| | - Linda Douw
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, Amsterdam UMCVrije Universiteit AmsterdamAmsterdamThe Netherlands
| | - Liesbeth Reneman
- Department of Radiology and Nuclear Medicine, Amsterdam Neuroscience, Amsterdam UMCUniversity of AmsterdamAmsterdamThe Netherlands
| | - Anouk Schrantee
- Department of Radiology and Nuclear Medicine, Amsterdam Neuroscience, Amsterdam UMCUniversity of AmsterdamAmsterdamThe Netherlands
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8
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Dutta CN, Christov-Moore L, Ombao H, Douglas PK. Neuroprotection in late life attention-deficit/hyperactivity disorder: A review of pharmacotherapy and phenotype across the lifespan. Front Hum Neurosci 2022; 16:938501. [PMID: 36226261 PMCID: PMC9548548 DOI: 10.3389/fnhum.2022.938501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 08/16/2022] [Indexed: 11/13/2022] Open
Abstract
For decades, psychostimulants have been the gold standard pharmaceutical treatment for attention-deficit/hyperactivity disorder (ADHD). In the United States, an astounding 9% of all boys and 4% of girls will be prescribed stimulant drugs at some point during their childhood. Recent meta-analyses have revealed that individuals with ADHD have reduced brain volume loss later in life (>60 y.o.) compared to the normal aging brain, which suggests that either ADHD or its treatment may be neuroprotective. Crucially, these neuroprotective effects were significant in brain regions (e.g., hippocampus, amygdala) where severe volume loss is linked to cognitive impairment and Alzheimer's disease. Historically, the ADHD diagnosis and its pharmacotherapy came about nearly simultaneously, making it difficult to evaluate their effects in isolation. Certain evidence suggests that psychostimulants may normalize structural brain changes typically observed in the ADHD brain. If ADHD itself is neuroprotective, perhaps exercising the brain, then psychostimulants may not be recommended across the lifespan. Alternatively, if stimulant drugs are neuroprotective, then this class of medications may warrant further investigation for their therapeutic effects. Here, we take a bottom-up holistic approach to review the psychopharmacology of ADHD in the context of recent models of attention. We suggest that future studies are greatly needed to better appreciate the interactions amongst an ADHD diagnosis, stimulant treatment across the lifespan, and structure-function alterations in the aging brain.
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Affiliation(s)
- Cintya Nirvana Dutta
- Biostatistics Group, Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
- School of Modeling, Simulation, and Training, and Computer Science, University of Central Florida, Orlando, FL, United States
| | - Leonardo Christov-Moore
- Brain and Creativity Institute, University of Southern California, Los Angeles, CA, United States
| | - Hernando Ombao
- Biostatistics Group, Computer, Electrical and Mathematical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Pamela K. Douglas
- School of Modeling, Simulation, and Training, and Computer Science, University of Central Florida, Orlando, FL, United States
- Department of Psychiatry and Biobehavioral Medicine, University of California, Los Angeles, Los Angeles, CA, United States
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9
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Caravaggio F, Barnett AJ, Nakajima S, Iwata Y, Kim J, Borlido C, Mar W, Gerretsen P, Remington G, Graff-Guerrero A. The effects of acute dopamine depletion on resting-state functional connectivity in healthy humans. Eur Neuropsychopharmacol 2022; 57:39-49. [PMID: 35091322 DOI: 10.1016/j.euroneuro.2022.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 01/05/2022] [Accepted: 01/10/2022] [Indexed: 11/24/2022]
Abstract
Alpha-methyl-para-tyrosine (AMPT), a competitive inhibitor of tyrosine hydroxylase, can be used to deplete endogenous dopamine in humans. We examined how AMPT-induced dopamine depletion alters resting-state functional connectivity of the basal ganglia, and canonical resting-state networks, in healthy humans. Fourteen healthy participants (8 females; age [mean ± SD] = 27.93 ± 9.86) completed the study. Following dopamine depletion, the caudate showed reduced connectivity with the medial prefrontal cortex (mPFC) (Cohen's d = 1.89, p<.0001). Moreover, the caudate, putamen, globus pallidus, and midbrain all showed reduced connectivity with the occipital cortex (Cohen's d = 1.48-1.90; p<.0001-0.001). Notably, the dorsal caudate showed increased connectivity with the sensorimotor network (Cohen's d = 2.03, p=.002). AMPT significantly decreased self-reported motivation (t(13)=4.19, p=.001) and increased fatigue (t(13)=4.79, p=.0004). A greater increase in fatigue was associated with a greater reduction in connectivity between the substantia nigra and the mPFC (Cohen's d = 3.02, p<.00001), while decreased motivation was correlated with decreased connectivity between the VTA and left sensorimotor cortex (Cohen's d = 2.03, p=.00004). These findings help us to better understand the role of dopamine in basal ganglia function and may help us better understand neuropsychiatric diseases where abnormal dopamine levels are observed.
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Affiliation(s)
- Fernando Caravaggio
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, 250 College Street, Toronto, ON M5T 1R8, Canada; Department of Psychiatry, University of Toronto, 250 College Street, Toronto, ON M5T 1R8, Canada.
| | - Alexander J Barnett
- Center for Neuroscience, University of California, Davis, 1515 Newton Ct, Davis, California 95618, United States of America
| | - Shinichiro Nakajima
- Department of Neuropsychiatry, Keio University, 2 Chome-15-45 Mita, Tokyo 108-8345, Japan
| | - Yusuke Iwata
- Department of Neuropsychiatry, University of Yamanashi, 4 Chome-4-37 Takeda, Kofu 400-8510, Japan
| | - Julia Kim
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, 250 College Street, Toronto, ON M5T 1R8, Canada
| | - Carol Borlido
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, 250 College Street, Toronto, ON M5T 1R8, Canada
| | - Wanna Mar
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, 250 College Street, Toronto, ON M5T 1R8, Canada
| | - Philip Gerretsen
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, 250 College Street, Toronto, ON M5T 1R8, Canada; Department of Psychiatry, University of Toronto, 250 College Street, Toronto, ON M5T 1R8, Canada
| | - Gary Remington
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, 250 College Street, Toronto, ON M5T 1R8, Canada; Department of Psychiatry, University of Toronto, 250 College Street, Toronto, ON M5T 1R8, Canada
| | - Ariel Graff-Guerrero
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, 250 College Street, Toronto, ON M5T 1R8, Canada; Department of Psychiatry, University of Toronto, 250 College Street, Toronto, ON M5T 1R8, Canada
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10
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Male sex bias in early and late onset neurodevelopmental disorders: shared aspects and differences in autism spectrum disorder, attention deficit/hyperactivity disorder, and schizophrenia. Neurosci Biobehav Rev 2022; 135:104577. [DOI: 10.1016/j.neubiorev.2022.104577] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 01/23/2022] [Accepted: 02/11/2022] [Indexed: 12/22/2022]
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11
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Iqbal M, Cox SML, Jaworska N, Tippler M, Castellanos-Ryan N, Parent S, Dagher A, Vitaro F, Brendgen MR, Boivin M, Pihl RO, Côté SM, Tremblay RE, Séguin JR, Leyton M. A three-factor model of common early onset psychiatric disorders: temperament, adversity, and dopamine. Neuropsychopharmacology 2022; 47:752-758. [PMID: 34625707 PMCID: PMC8783001 DOI: 10.1038/s41386-021-01187-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 02/03/2023]
Abstract
Commonly comorbid early onset psychiatric disorders might reflect the varying expression of overlapping risk factors. The mediating processes remain poorly understood, but three factors show some promise: adolescent externalizing traits, early life adversity, and midbrain dopamine autoreceptors. To investigate whether these features acquire greater predictive power when combined, a longitudinal study was conducted in youth who have been followed since birth. Cohort members were invited to participate based on externalizing scores between 11 to 16 years of age. At age 18 (age 18.5 ± 0.6 y.o.), 52 entry criteria meeting volunteers had a 90-min positron emission tomography scan with [18F]fallypride, completed the Childhood Trauma Questionnaire, and were assessed with the Structured Clinical Interview for DSM-5. The three-factor model identified those with a lifetime history of DSM-5 disorders with an overall accuracy of 90.4% (p = 2.4 × 10-5) and explained 91.5% of the area under the receiver operating characteristic curve [95% CI: .824, 1.000]. Targeting externalizing disorders specifically did not yield a more powerful model than targeting all disorders (p = 0.54). The model remained significant when including data from participants who developed their first disorders during a three-year follow-up period (p = 3.5 × 10-5). Together, these results raise the possibility that a combination of temperamental traits, childhood adversity, and poorly regulated dopamine transmission increases risk for diverse, commonly comorbid, early onset psychiatric problems, predicting this susceptibility prospectively.
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Affiliation(s)
- Maisha Iqbal
- grid.416102.00000 0004 0646 3639Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC Canada
| | | | - Natalia Jaworska
- grid.28046.380000 0001 2182 2255Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON Canada ,grid.28046.380000 0001 2182 2255University of Ottawa Institute of Mental Health Research, Ottawa, ON Canada
| | - Maria Tippler
- grid.416102.00000 0004 0646 3639Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC Canada
| | - Natalie Castellanos-Ryan
- grid.14848.310000 0001 2292 3357School of Psychoeducation, Université de Montréal, Montreal, QC Canada
| | - Sophie Parent
- grid.14848.310000 0001 2292 3357School of Psychoeducation, Université de Montréal, Montreal, QC Canada
| | - Alain Dagher
- grid.416102.00000 0004 0646 3639Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC Canada
| | - Frank Vitaro
- grid.14848.310000 0001 2292 3357School of Psychoeducation, Université de Montréal, Montreal, QC Canada ,grid.411418.90000 0001 2173 6322CHU Ste-Justine Research Center, Montreal, QC Canada
| | - Mara R. Brendgen
- grid.411418.90000 0001 2173 6322CHU Ste-Justine Research Center, Montreal, QC Canada ,grid.38678.320000 0001 2181 0211Department of Psychology, Université de Québec à Montréal, Montreal, QC Canada
| | - Michel Boivin
- grid.23856.3a0000 0004 1936 8390Department of Psychology, Université Laval, Quebec, ON Canada ,grid.77602.340000 0001 1088 3909Institute of Genetic, Neurobiological and Social Foundations of Child Development, Tomsk State University, Siberia, Russia
| | - Robert O. Pihl
- grid.77602.340000 0001 1088 3909Institute of Genetic, Neurobiological and Social Foundations of Child Development, Tomsk State University, Siberia, Russia
| | - Sylvana M. Côté
- grid.411418.90000 0001 2173 6322CHU Ste-Justine Research Center, Montreal, QC Canada ,grid.14848.310000 0001 2292 3357Department of Social & Preventative Medicine, Université de Montréal, Montreal, QC Canada
| | - Richard E. Tremblay
- grid.411418.90000 0001 2173 6322CHU Ste-Justine Research Center, Montreal, QC Canada ,grid.14848.310000 0001 2292 3357Departments of Pediatrics & Psychology, Université de Montréal, Montreal, QC Canada ,grid.7886.10000 0001 0768 2743School of Public Health and Sports Science, University College Dublin, Dublin, Ireland ,grid.7429.80000000121866389INSERM, U669 Paris, France
| | - Jean R. Séguin
- grid.411418.90000 0001 2173 6322CHU Ste-Justine Research Center, Montreal, QC Canada ,grid.14848.310000 0001 2292 3357Department of Psychiatry and Addictology, Université de Montréal, Montreal, QC Canada
| | - Marco Leyton
- Department of Neurology & Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, QC, Canada. .,Department of Psychiatry, McGill University, Montreal, QC, Canada. .,CHU Ste-Justine Research Center, Montreal, QC, Canada. .,Department of Psychology, McGill University, Montreal, QC, Canada. .,Center for Studies in Behavioral Neurobiology, Concordia University, Montreal, QC, Canada.
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12
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Ren K, Liu H, Guo B, Li R, Mao H, Xue Q, Yao H, Wu S, Bai Z, Wang W. Quercetin relieves D-amphetamine-induced manic-like behaviour through activating TREK-1 potassium channels in mice. Br J Pharmacol 2021; 178:3682-3695. [PMID: 33908633 DOI: 10.1111/bph.15510] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 04/06/2021] [Accepted: 04/09/2021] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND AND PURPOSE Quercetin is a well-known plant flavonoid with neuroprotective properties. Earlier work suggested it may relieve psychiatric disorders, cognition deficits and memory dysfunction through anti-oxidant and/or radical scavenging mechanisms. In addition, quercetin modulated the physiological function of some ion channels. However, the detailed ionic mechanisms of the bioeffects of quercetin remain unknown. EXPERIMENTAL APPROACH Effects of quercetin on neuronal activities in the prefrontal cortex (PFC) and its ionic mechanisms were analysed by calcium imaging using mice bearing a green fluorescent protein, calmodulin, and M13 fusion protein and patch clamp in acute brain slices from C57BL/6 J mice and in HEK 293 cells. The possible ionic mechanism of action of quercetin on D-amphetamine-induced manic-like effects in mice was explored with c-fos staining and the open field behaviour test. KEY RESULTS Quercetin reduced calcium influx triggered by PFC pyramidal neuronal activity. This effect involved increasing the rheobase of neuronal firing through decreasing membrane resistance following quercetin treatment. Spadin, a blocker of TREK-1 potassium channels, also blocked the effect of quercetin on the membrane resistance and neuronal firing. Further, spadin blocked the neuroprotective effects of quercetin. The effects of quercetin on TREK-1 channels could be mimicked by GF109203X, a protein kinase C inhibitor. In vivo, injection of quercetin relieved the manic hyperlocomotion in mice, induced by D-amphetamine. This action was partly alleviated by spadin. CONCLUSION AND IMPLICATIONS TREK-1 channels are a novel target for quercetin, by inhibiting PKC. This action could contribute to both the neuroprotective and anti-manic-like effects.
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Affiliation(s)
- Keke Ren
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China.,College of Life Sciences and Research Center for Resource Peptide Drugs, Shaanxi Engineering and Technological Research Center for Conversation and Utilization of Regional Biological Resources, Yanan University, Yanan, China
| | - Haiying Liu
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Baolin Guo
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Rui Li
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Honghui Mao
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Qian Xue
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Han Yao
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Shengxi Wu
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China
| | - Zhantao Bai
- College of Life Sciences and Research Center for Resource Peptide Drugs, Shaanxi Engineering and Technological Research Center for Conversation and Utilization of Regional Biological Resources, Yanan University, Yanan, China
| | - Wenting Wang
- Department of Neurobiology, School of Basic Medicine, Fourth Military Medical University, Xi'an, China
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13
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A pilot study on the association between the blood oxygen level-dependent signal in the reward system and dopamine transporter availability in adults with attention deficit hyperactivity disorder. CNS Spectr 2021; 26:299-306. [PMID: 32308185 DOI: 10.1017/s1092852920001133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND It is well-known that attention deficit hyperactivity disorder (ADHD) is associated with changes in the dopaminergic system. However, the relationship between central dopaminergic tone and the blood oxygen level-dependent (BOLD) signal during receipt of rewards and penalties in the corticostriatal pathway in adults with ADHD is unclear. METHODS Single-photon emission computed tomography with [99mTC]TRODAT-1 was used to assess striatal dopamine transporter (DAT) availability. Event-related functional magnetic resonance imaging was conducted on subjects performing the Iowa Gambling Test. RESULT DAT availability was found to be associated with the BOLD response, which was a covariate of monetary loss, in the medial prefrontal cortex (r = 0.55, P = .03), right ventral striatum (r = 0.69, P = .003), and right orbital frontal cortex (r = 0.53, P = .03) in adults with ADHD. However, a similar correlation was not found in the controls. CONCLUSIONS The results confirmed that dopaminergic tone may play a different role in the penalty-elicited response of adults with ADHD. It is plausible that a lower neuro-threshold accompanied by insensitivity to punishment could be exacerbated by the hypodopaminergic tone in ADHD.
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14
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Shi X, Guan K, Peng X, Xu B, Zhou X, Wang S, Xu S, Zheng M, Huang J, Wan X, Guan W, Su KP, Ye M, Gao X, Yin Z, Li X. Ghrelin modulates dopaminergic neuron formation and attention deficit hyperactivity disorder-like behaviors: From animals to human models. Brain Behav Immun 2021; 94:327-337. [PMID: 33412253 DOI: 10.1016/j.bbi.2020.12.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 12/22/2020] [Accepted: 12/28/2020] [Indexed: 10/22/2022] Open
Abstract
Attention deficit hyperactivity disorder (ADHD) is one of the most prevalent psychiatric disorders in children. The orexigenic hormone ghrelin is important in neuroprotection and neurodevelopment, which may play an important role in psychopathogenesis of ADHD. This study aimed to systematically investigate the genomic and pharmacological manipulations of ghrelin functioning in ADHD-like symptoms in zebrafish models and validated the effects of ghrelin polymorphisms in human subjects with ADHD. We firstly generated ghrelinΔ/Δ zebrafish mutant, which displayed hyperactive, attention deficit-like and impulsive-like behaviors, as well as endophenotypes, mimicking human ADHD. GhrelinΔ/Δ zebrafish exhibited downregulated expression levels of wnt1, wnt3a, wnt5a that are critical for dopaminergic neuron development to possibly regulate their number and spatial organization. Pharmacological blockade of wnt signaling with XAV939 induced a reduced moving activity and less dopaminergic neurons; whereas, wnt agonist SB415286 rescued hyperactivity and dopaminergic neuron loss in ghrelinΔ/Δ zebrafish. In addition, we further identified and validated a SNP, rs696217, on orexigenic hormone preproghrelin/ghrelin (T408T, Met72Met) to be associated with a higher risk of ADHD in a case-controlled association study with 248 subjects with ADHD and 208 subjects of healthy controls. Together, our results reveal a novel endogenous role for orexigenic hormone ghrelin in ADHD, which provides insights into genetic regulation and drug screens for the identification of novel treatments of ADHD.
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Affiliation(s)
- Xulai Shi
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Kaiyu Guan
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Xuyan Peng
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, PR China
| | - Bingru Xu
- School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Xianyong Zhou
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Shao Wang
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Shengnan Xu
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Miaomiao Zheng
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Jing Huang
- Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA
| | - Xiaoyang Wan
- Institute of Infectious Liver Disease, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Wanchun Guan
- School of Laboratory Medicine and Life Science, Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Kuan-Pin Su
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK; An-Nan Hospital, China Medical University, Tainan, Taiwan
| | - Minjie Ye
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China
| | - Xiang Gao
- Central Laboratory, Scientific Research Department, Renmin Hospital of Wuhan University, Wuhan, Hubei, China.
| | - Zhan Yin
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, PR China.
| | - Xi Li
- The Affiliated Kangning Hospital of Wenzhou Medical University, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, Zhejiang Province, PR China.
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15
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Abstract
Recent epidemiological evidence indicates that diagnosis of attention-deficit/hyperactivity disorder (ADHD) is associated with increased risk for diseases of the basal ganglia and cerebellum, including Parkinson's disease (PD). The evidence reviewed here indicates that deficits in striatal dopamine are a shared component of the causal chains that produce these disorders. Neuropsychological studies of adult ADHD, prodromal PD, and early-stage PD reveal similar deficits in executive functions, memory, attention, and inhibition that are mediated by similar neural substrates. These and other findings are consistent with the possibility that ADHD may be part of the PD prodrome. The mechanisms that may mediate the association between PD and ADHD include neurotoxic effects of stimulants, other environmental exposures, and Lewy pathology. Understanding the nature of the association between PD and ADHD may provide insight into the etiology and pathogenesis of both disorders. The possible contribution of stimulants to this association may have important clinical and public health implications.
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16
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Caravaggio F, Porco N, Kim J, Torres-Carmona E, Brown E, Iwata Y, Nakajima S, Gerretsen P, Remington G, Graff-Guerrero A. Measuring amphetamine-induced dopamine release in humans: A comparative meta-analysis of [ 11 C]-raclopride and [ 11 C]-(+)-PHNO studies. Synapse 2021; 75:e22195. [PMID: 33471400 DOI: 10.1002/syn.22195] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 01/02/2021] [Accepted: 01/13/2021] [Indexed: 02/06/2023]
Abstract
The radiotracers [11 C]-raclopride and [11 C]-(+)-PHNO are commonly used to measure differences in amphetamine-induced dopamine release between healthy persons and persons with neuropsychiatric diseases. As an agonist radiotracer, [11 C]-(+)-PHNO should theoretically be roughly 2.7 times more sensitive to displacement by endogenous dopamine than [11 C]raclopride. To date, only one study has been published comparing the sensitivity of these two radiotracers to amphetamine-induced dopamine release in healthy persons. Unfortunately, conflicting findings in the literature suggests that the dose of amphetamine they employed (0.3 mg/kg, p.o.) may not reliably reduce [11 C]-raclopride binding in the caudate. Thus, it is unclear whether the preponderance of evidence supports the theory that [11 C]-(+)-PHNO is more sensitive to displacement by amphetamine in humans than [11 C]-raclopride. In order to clarify these issues, we conducted a comparative meta-analysis summarizing the effects of amphetamine on [11 C]-raclopride and [11 C]-(+)-PHNO binding in healthy humans. Our analysis indicates that amphetamine given at 0.3 mg/kg, p.o. does not reliably reduce [11 C]-raclopride binding in the caudate. Second, the greater sensitivity of [11 C]-(+)-PHNO is evidenced at 0.5 mg/kg, p.o., but not at lower doses of amphetamine. Third, our analysis suggests that [11 C]-(+)-PHNO may be roughly 1.5 to 2.5 times more sensitive to displacement by amphetamine than [11 C]-raclopride in healthy persons. We recommend that future displacement studies with these radiotracers employ 0.5 mg/kg, p.o. of amphetamine with a dose, post-scan interval of at least 3 hr. Using this dose of amphetamine, [11 C]-raclopride studies should employ at least n = 34 participants per group, while [11 C]-(+)-PHNO studies should employ at least n = 6 participants per group, in order to be sufficiently powered (80%) to detect changes in radiotracer binding within the caudate.
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Affiliation(s)
- Fernando Caravaggio
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Natasha Porco
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Julia Kim
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Edgardo Torres-Carmona
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Eric Brown
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Yusuke Iwata
- Department of Neuropsychiatry, University of Yamanashi, Chuo, Japan
| | | | - Philip Gerretsen
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Gary Remington
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
| | - Ariel Graff-Guerrero
- Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, ON, Canada.,Department of Psychiatry, University of Toronto, Toronto, ON, Canada
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17
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Cumming P, Gründer G, Brinson Z, Wong DF. Applications, Advances, and Limitations of Molecular Imaging of Brain Receptors. Mol Imaging 2021. [DOI: 10.1016/b978-0-12-816386-3.00063-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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18
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Kuwagata M, Muneoka K, Honda K, Miyazaki A. Hypothalamic Monoaminergic Pathology in a Neurodevelopmental Rat Model Showing Prenatal 5-Bromo-2'-Deoxyuridine Treatment-Induced Hyperactivity and Hyporeproductivity. Neuropsychobiology 2020; 79:161-169. [PMID: 31822012 DOI: 10.1159/000504552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 11/03/2019] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Prenatal treatment of rats with 5-bromo-2'-deoxyuridine (BrdU) is a neurodevelopmental model showing hyperactivity and impaired sexual activity. Human neurodevelopmental disorders, such as autism, exhibit sex-related pathology, but sex-related neurodevelopment has not been fully investigated in this model. We conducted this study to facilitate the understanding of the pathophysiology of neurodevelopmental disorders. METHODS Pregnant rats received 50 mg/kg BrdU on gestational days 9-15. The tissue content of dopamine (DA), serotonin (5-HT), and their metabolites dihydroxyphenylacetic acid, homovanillic acid, and 5-hydroxyindoleacetic acid were measured in male and female offspring at 3 weeks (juveniles) and 10 weeks (adults) of age. RESULTS Prenatally BrdU-treated rats had reduced DA metabolism or DA content in the hypothalamus from the juvenile through the adult period without sex differences, but sex-specific striatal DA abnormalities emerged after maturation. A reduction in 5-HT metabolism was measured in the hypothalamus without sex differences throughout development. Developmental alterations in the striatal 5-HT states were sex-dependent. Temporal changes in DA or 5-HT metabolism were found in the frontal cortex and midbrain. CONCLUSION The sex-specific influence of a genotoxic factor on the development of the DA and 5-HT systems was clarified in the hypothalamus and striatum. The results suggest that the observed sex dependence and region specificity are related to the pathology of social dysfunction in neurodevelopmental disorders.
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Affiliation(s)
- Makiko Kuwagata
- Department of Anatomy, Showa University School of Medicine, Tokyo, Japan.,Laboratory of Safety Evaluation, Division of Safety, Hatano Research Institute, Food and Drug Safety Center, Hadano, Japan.,Division of Cellular and Molecular Toxicology, Center for Biological Safety and Research, National Institute of Health Science, Kawasaki, Japan
| | - Katsumasa Muneoka
- Department of Anatomy, Showa University School of Medicine, Tokyo, Japan, .,Department of Biochemistry, Showa University School of Medicine, Tokyo, Japan,
| | - Kazuho Honda
- Department of Anatomy, Showa University School of Medicine, Tokyo, Japan
| | - Akira Miyazaki
- Department of Biochemistry, Showa University School of Medicine, Tokyo, Japan
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19
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GC-TOF-MS-Based Metabolomic Analysis and Evaluation of the Effects of HX106, a Nutraceutical, on ADHD-Like Symptoms in Prenatal Alcohol Exposed Mice. Nutrients 2020; 12:nu12103027. [PMID: 33023237 PMCID: PMC7600704 DOI: 10.3390/nu12103027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 11/16/2022] Open
Abstract
Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder that occurs in children characterized by inattention and hyperactivity. Prenatal alcohol exposure (PAE) can disrupt fetal neuronal development and cause an ADHD-like hyperactive behavior in the offspring. In this study, we hypothesized that metabolic disturbance would involve in ADHD neuropathology and aimed to investigate the changes in metabolite profile in PAE-induced ADHD-like model and the effects of HX106, a nutraceutical, on ADHD-like pathophysiology and metabolite changes. To this end, we administered HX106 to the mouse offspring affected by PAE (OPAE) and assessed the hyperactivity using the open field test. We observed that HX106-treated OPAE showed less hyperactive behavior than vehicle-treated OPAE. The effects of HX106 were found to be related to the regulation of dopamine transporter and D2 dopamine receptor expression. Furthermore, using gas chromatography time-of-flight mass spectrometry-based metabolomics, we explored the metabolite changes among the experimental groups. The metabolite profile, particularly related with the amino acids, linoleic acid and amino sugar pathways, was altered by PAE and reversed by HX106 treatment partially similar to that observed in the control group. Overall, this study suggest that metabolite alteration would be involved in ADHD pathology and that HX106 can be an efficient supplement to overcome ADHD by regulating dopamine signaling-related protein expression and metabolite changes.
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20
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Grimm O, Weber H, Kittel-Schneider S, Kranz TM, Jacob CP, Lesch KP, Reif A. Impulsivity and Venturesomeness in an Adult ADHD Sample: Relation to Personality, Comorbidity, and Polygenic Risk. Front Psychiatry 2020; 11:557160. [PMID: 33381055 PMCID: PMC7768074 DOI: 10.3389/fpsyt.2020.557160] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 10/12/2020] [Indexed: 12/25/2022] Open
Abstract
While impulsivity is a basic feature of attention-deficit/hyperactivity disorder (ADHD), no study explored the effect of different components of the Impulsiveness (Imp) and Venturesomeness (Vent) scale (IV7) on psychiatric comorbidities and an ADHD polygenic risk score (PRS). We used the IV7 self-report scale in an adult ADHD sample of 903 patients, 70% suffering from additional comorbid disorders, and in a subsample of 435 genotyped patients. Venturesomeness, unlike immediate Impulsivity, is not specific to ADHD. We consequently analyzed the influence of Imp and Vent also in the context of a PRS on psychiatric comorbidities of ADHD. Vent shows a distinctly different distribution of comorbidities, e.g., less anxiety and depression. PRS showed no effect on different ADHD comorbidities, but correlated with childhood hyperactivity. In a complementary analysis using principal component analysis with Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition ADHD criteria, revised NEO Personality Inventory, Imp, Vent, and PRS, we identified three ADHD subtypes. These are an impulsive-neurotic type, an adventurous-hyperactive type with a stronger genetic component, and an anxious-inattentive type. Our study thus suggests the importance of adventurousness and the differential consideration of impulsivity in ADHD. The genetic risk is distributed differently between these subtypes, which underlines the importance of clinically motivated subtyping. Impulsivity subtyping might give insights into the organization of comorbid disorders in ADHD and different genetic background.
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Affiliation(s)
- Oliver Grimm
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany
| | - Heike Weber
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany.,Klinik für Psychiatrie und Psychotherapie der Medius Klinik, Kirchheim unter Teck, Germany
| | - Sarah Kittel-Schneider
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany.,Division of Molecular Psychiatry, Center of Mental Health, University of Wuerzburg, Wuerzburg, Germany
| | - Thorsten M Kranz
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany
| | - Christian P Jacob
- Klinik für Psychiatrie und Psychotherapie der Medius Klinik, Kirchheim unter Teck, Germany
| | - Klaus-Peter Lesch
- Division of Molecular Psychiatry, Center of Mental Health, University of Wuerzburg, Wuerzburg, Germany
| | - Andreas Reif
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital, Goethe University, Frankfurt, Germany
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21
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Sethi A, Voon V, Critchley HD, Cercignani M, Harrison NA. A neurocomputational account of reward and novelty processing and effects of psychostimulants in attention deficit hyperactivity disorder. Brain 2019; 141:1545-1557. [PMID: 29547978 PMCID: PMC5917772 DOI: 10.1093/brain/awy048] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 01/06/2018] [Indexed: 01/01/2023] Open
Abstract
Computational models of reinforcement learning have helped dissect discrete components of reward-related function and characterize neurocognitive deficits in psychiatric illnesses. Stimulus novelty biases decision-making, even when unrelated to choice outcome, acting as if possessing intrinsic reward value to guide decisions toward uncertain options. Heightened novelty seeking is characteristic of attention deficit hyperactivity disorder, yet how this influences reward-related decision-making is computationally encoded, or is altered by stimulant medication, is currently uncertain. Here we used an established reinforcement-learning task to model effects of novelty on reward-related behaviour during functional MRI in 30 adults with attention deficit hyperactivity disorder and 30 age-, sex- and IQ-matched control subjects. Each participant was tested on two separate occasions, once ON and once OFF stimulant medication. OFF medication, patients with attention deficit hyperactivity disorder showed significantly impaired task performance (P = 0.027), and greater selection of novel options (P = 0.004). Moreover, persistence in selecting novel options predicted impaired task performance (P = 0.025). These behavioural deficits were accompanied by a significantly lower learning rate (P = 0.011) and heightened novelty signalling within the substantia nigra/ventral tegmental area (family-wise error corrected P < 0.05). Compared to effects in controls, stimulant medication improved attention deficit hyperactivity disorder participants' overall task performance (P = 0.011), increased reward-learning rates (P = 0.046) and enhanced their ability to differentiate optimal from non-optimal novel choices (P = 0.032). It also reduced substantia nigra/ventral tegmental area responses to novelty. Preliminary cross-sectional evidence additionally suggested an association between long-term stimulant treatment and a reduction in the rewarding value of novelty. These data suggest that aberrant substantia nigra/ventral tegmental area novelty processing plays an important role in the suboptimal reward-related decision-making characteristic of attention deficit hyperactivity disorder. Compared to effects in controls, abnormalities in novelty processing and reward-related learning were improved by stimulant medication, suggesting that they may be disorder-specific targets for the pharmacological management of attention deficit hyperactivity disorder symptoms.
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Affiliation(s)
- Arjun Sethi
- Department of Neuroscience, Brighton and Sussex Medical School, University of Sussex, Brighton, UK
| | - Valerie Voon
- Department of Psychiatry, University of Cambridge, Cambridge, UK.,Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge, UK
| | - Hugo D Critchley
- Department of Neuroscience, Brighton and Sussex Medical School, University of Sussex, Brighton, UK.,Sackler Centre for Consciousness Science, University of Sussex, Brighton, UK.,Sussex Partnership NHS Foundation Trust, Brighton, UK
| | - Mara Cercignani
- Department of Neuroscience, Brighton and Sussex Medical School, University of Sussex, Brighton, UK
| | - Neil A Harrison
- Department of Neuroscience, Brighton and Sussex Medical School, University of Sussex, Brighton, UK.,Sackler Centre for Consciousness Science, University of Sussex, Brighton, UK.,Sussex Partnership NHS Foundation Trust, Brighton, UK
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22
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Schrantee A, Bouziane C, Bron EE, Klein S, Bottelier MA, Kooij JJS, Rombouts SARB, Reneman L. Long-term effects of stimulant exposure on cerebral blood flow response to methylphenidate and behavior in attention-deficit hyperactivity disorder. Brain Imaging Behav 2019; 12:402-410. [PMID: 28321605 PMCID: PMC5880865 DOI: 10.1007/s11682-017-9707-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Stimulant prescription rates for attention deficit hyperactivity disorder (ADHD) are increasing, even though potential long-term effects on the developing brain have not been well-studied. A previous randomized clinical trial showed short-term age-dependent effects of stimulants on the DA system. We here assessed the long-term modifying effects of age-of-first-stimulant treatment on the human brain and behavior. 81 male adult ADHD patients were stratified into three groups: 1) early stimulant treatment (EST; <16 years of age) 2) late stimulant treatment (LST: ≥23 years of age) and 3) stimulant treatment naive (STN; no history of stimulant treatment). We used pharmacological magnetic resonance imaging (phMRI) to assess the cerebral blood flow (CBF) response to an oral methylphenidate challenge (MPH, 0.5 mg/kg), as an indirect measure of dopamine function in fronto-striatal areas. In addition, mood and anxiety scores, and recreational drug use were assessed. Baseline ACC CBF was lower in the EST than the STN group (p = 0.03), although CBF response to MPH was similar between the three groups (p = 0.23). ADHD symptom severity was higher in the STN group compared to the other groups (p < 0.01). In addition, the EST group reported more depressive symptoms (p = 0.04), but not anxiety (p = 0.26), and less recreational drug use (p = 0.04). In line with extensive pre-clinical data, our data suggest that early, but not late, stimulant treatment long-lastingly affects the human brain and behavior, possibly indicating fundamental changes in the dopamine system.
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Affiliation(s)
- Anouk Schrantee
- Department of Radiology, Academic Medical Center, University of Amsterdam, P.O. Box 22660, 1105, AZ, Amsterdam, the Netherlands.
| | - C Bouziane
- Department of Radiology, Academic Medical Center, University of Amsterdam, P.O. Box 22660, 1105, AZ, Amsterdam, the Netherlands
| | - E E Bron
- Biomedical Imaging Group Rotterdam, Departments of Medical Informatics and Radiology, Erasmus MC, P.O. Box 2040, 3000, CA, Rotterdam, The Netherlands
| | - S Klein
- Biomedical Imaging Group Rotterdam, Departments of Medical Informatics and Radiology, Erasmus MC, P.O. Box 2040, 3000, CA, Rotterdam, The Netherlands
| | - M A Bottelier
- Department of Radiology, Academic Medical Center, University of Amsterdam, P.O. Box 22660, 1105, AZ, Amsterdam, the Netherlands.,Department of Child- and Adolescent Psychiatry, Triversum, Kees Boekestraat 5, 1817, EZ, Alkmaar, The Netherlands
| | - J J S Kooij
- Expertise Center Adult ADHD, PsyQ, Psycho-Medical Programs, Carel Reinierszkade 197, 2593, HR, The Hague, The Netherlands
| | - S A R B Rombouts
- Institute of Psychology, Leiden University, P.O. Box 9555, 2300, RB, Leiden, The Netherlands.,Department of Radiology, LUMC, P.O. Box 9600, 2300 RC, Leiden, The Netherlands
| | - L Reneman
- Department of Radiology, Academic Medical Center, University of Amsterdam, P.O. Box 22660, 1105, AZ, Amsterdam, the Netherlands
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23
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Faraone SV. The pharmacology of amphetamine and methylphenidate: Relevance to the neurobiology of attention-deficit/hyperactivity disorder and other psychiatric comorbidities. Neurosci Biobehav Rev 2018; 87:255-270. [PMID: 29428394 DOI: 10.1016/j.neubiorev.2018.02.001] [Citation(s) in RCA: 311] [Impact Index Per Article: 51.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 01/25/2018] [Accepted: 02/05/2018] [Indexed: 12/20/2022]
Abstract
Psychostimulants, including amphetamines and methylphenidate, are first-line pharmacotherapies for individuals with attention-deficit/hyperactivity disorder (ADHD). This review aims to educate physicians regarding differences in pharmacology and mechanisms of action between amphetamine and methylphenidate, thus enhancing physician understanding of psychostimulants and their use in managing individuals with ADHD who may have comorbid psychiatric conditions. A systematic literature review of PubMed was conducted in April 2017, focusing on cellular- and brain system-level effects of amphetamine and methylphenidate. The primary pharmacologic effect of both amphetamine and methylphenidate is to increase central dopamine and norepinephrine activity, which impacts executive and attentional function. Amphetamine actions include dopamine and norepinephrine transporter inhibition, vesicular monoamine transporter 2 (VMAT-2) inhibition, and monoamine oxidase activity inhibition. Methylphenidate actions include dopamine and norepinephrine transporter inhibition, agonist activity at the serotonin type 1A receptor, and redistribution of the VMAT-2. There is also evidence for interactions with glutamate and opioid systems. Clinical implications of these actions in individuals with ADHD with comorbid depression, anxiety, substance use disorder, and sleep disturbances are discussed.
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Affiliation(s)
- Stephen V Faraone
- Departments of Psychiatry and of Neuroscience and Physiology, State University of New York (SUNY) Upstate Medical University, Syracuse, NY, United States; K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, University of Bergen, Bergen, Norway.
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24
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Wajszilber D, Santiseban JA, Gruber R. Sleep disorders in patients with ADHD: impact and management challenges. Nat Sci Sleep 2018; 10:453-480. [PMID: 30588139 PMCID: PMC6299464 DOI: 10.2147/nss.s163074] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Attention deficit/hyperactivity disorder (ADHD) is one of the most commonly diagnosed disorders in childhood, enduring through adolescence and adulthood and presenting with symptoms of inattention, hyperactivity, and/or impulsivity and significantly impairing functioning. Primary sleep disorders such as sleep-disordered breathing, restless leg syndrome, circadian rhythm sleep disorder, insomnia, and narcolepsy are commonly comorbid in these individuals but not often assessed and are therefore often left untreated. Sleep disturbances in individuals with ADHD can result in significant functional impairments that affect mood, attention, behavior, and ultimately school/work performance and quality of life. Previous reviews have described findings related to sleep but have neglected to examine potential impacts of these sleep disorders and ADHD on daytime functioning. This review investigates empirical findings pertaining to sleep abnormalities and related cognitive, behavioral, emotional, and physical impairments in individuals with ADHD and comorbid primary sleep disorders across the life span. It discusses implications to management and highlights existing limitations and recommended future directions.
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Affiliation(s)
- Dafna Wajszilber
- Department of Psychiatry, Faculty of Medicine, McGill University, Montréal, Quebec, Canada,
| | - José Arturo Santiseban
- Department of Psychiatry, Faculty of Medicine, McGill University, Montréal, Quebec, Canada, .,Attention Behavior and Sleep Lab, Douglas Research Center, Montréal, Quebec, Canada,
| | - Reut Gruber
- Department of Psychiatry, Faculty of Medicine, McGill University, Montréal, Quebec, Canada, .,Attention Behavior and Sleep Lab, Douglas Research Center, Montréal, Quebec, Canada,
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25
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Cherkasova MV, Faridi N, Casey KF, Larcher K, O'Driscoll GA, Hechtman L, Joober R, Baker GB, Palmer J, Evans AC, Dagher A, Benkelfat C, Leyton M. Differential Associations between Cortical Thickness and Striatal Dopamine in Treatment-Naïve Adults with ADHD vs. Healthy Controls. Front Hum Neurosci 2017; 11:421. [PMID: 28878639 PMCID: PMC5572420 DOI: 10.3389/fnhum.2017.00421] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 08/04/2017] [Indexed: 12/29/2022] Open
Abstract
Alterations in catecholamine signaling and cortical morphology have both been implicated in the pathophysiology of attention deficit/hyperactivity disorder (ADHD). However, possible links between the two remain unstudied. Here, we report exploratory analyses of cortical thickness and its relation to striatal dopamine transmission in treatment-naïve adults with ADHD and matched healthy controls. All participants had one magnetic resonance imaging (MRI) and two [11C]raclopride positron emission tomography scans. Associations between frontal cortical thickness and the magnitude of d-amphetamine-induced [11C]raclopride binding changes were observed that were divergent in the two groups. In the healthy controls, a thicker cortex was associated with less dopamine release; in the ADHD participants the converse was seen. The same divergence was seen for baseline D2/3 receptor availability. In healthy volunteers, lower D2/3 receptor availability was associated with a thicker cortex, while in the ADHD group lower baseline D2/3 receptor availability was associated with a thinner cortex. Individual differences in cortical thickness in these regions correlated with ADHD symptom severity. Together, these findings add to the evidence of associations between dopamine transmission and cortical morphology, and suggest that these relationships are altered in treatment-naïve adults with ADHD.
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Affiliation(s)
- Mariya V Cherkasova
- Division of Neurology, Department of Medicine, University of British ColumbiaVancouver, BC, Canada
| | - Nazlie Faridi
- Department of Medicine, Stanford UniversityStanford, CA, United States
| | - Kevin F Casey
- Centre Hospitalier Universitaire Sainte-JustineMontréal, QC, Canada
| | - Kevin Larcher
- Department of Neurology and Neurosurgery, McGill UniversityMontréal, QC, Canada
| | - Gillian A O'Driscoll
- Department of Psychology, McGill UniversityMontréal, QC, Canada.,Department of Psychiatry, McGill UniversityMontréal, QC, Canada
| | - Lily Hechtman
- Department of Psychiatry, McGill UniversityMontréal, QC, Canada
| | | | - Glen B Baker
- Department of Psychiatry, University of AlbertaMontréal, QC, Canada
| | | | - Alan C Evans
- Department of Neurology and Neurosurgery, McGill UniversityMontréal, QC, Canada
| | - Alain Dagher
- Department of Neurology and Neurosurgery, McGill UniversityMontréal, QC, Canada
| | - Chawki Benkelfat
- Department of Neurology and Neurosurgery, McGill UniversityMontréal, QC, Canada.,Department of Psychiatry, McGill UniversityMontréal, QC, Canada
| | - Marco Leyton
- Department of Neurology and Neurosurgery, McGill UniversityMontréal, QC, Canada.,Department of Psychology, McGill UniversityMontréal, QC, Canada.,Department of Psychiatry, McGill UniversityMontréal, QC, Canada.,Center for Studies in Behavioral Neurobiology, Concordia UniversityMontréal, QC, Canada
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26
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Jaworska N, Cox SM, Casey KF, Boileau I, Cherkasova M, Larcher K, Dagher A, Benkelfat C, Leyton M. Is there a relation between novelty seeking, striatal dopamine release and frontal cortical thickness? PLoS One 2017; 12:e0174219. [PMID: 28346539 PMCID: PMC5367687 DOI: 10.1371/journal.pone.0174219] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 03/05/2017] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Novelty-seeking (NS) and impulsive personality traits have been proposed to reflect an interplay between fronto-cortical and limbic systems, including the limbic striatum (LS). Although neuroimaging studies have provided some evidence for this, most are comprised of small samples and many report surprisingly large effects given the challenges of trying to relate a snapshot of brain function or structure to an entity as complex as personality. The current work tested a priori hypotheses about associations between striatal dopamine (DA) release, cortical thickness (CT), and NS in a large sample of healthy adults. METHODS Fifty-two healthy adults (45M/7F; age: 23.8±4.93) underwent two positron emission tomography scans with [11C]raclopride (specific for striatal DA D2/3 receptors) with or without amphetamine (0.3 mg/kg, p.o.). Structural magnetic resonance image scans were acquired, as were Tridimensional Personality Questionnaire data. Amphetamine-induced changes in [11C]raclopride binding potential values (ΔBPND) were examined in the limbic, sensorimotor (SMS) and associative (AST) striatum. CT measures, adjusted for whole brain volume, were extracted from the dorsolateral sensorimotor and ventromedial/limbic cortices. RESULTS BPND values were lower in the amphetamine vs. no-drug sessions, with the largest effect in the LS. When comparing low vs. high LS ΔBPND groups (median split), higher NS2 (impulsiveness) scores were found in the high ΔBPND group. Partial correlations (age and gender as covariates) yielded a negative relation between ASTS ΔBPND and sensorimotor CT; trends for inverse associations existed between ΔBPND values in other striatal regions and frontal CT. In other words, the greater the amphetamine-induced striatal DA response, the thinner the frontal cortex. CONCLUSIONS These data expand upon previously reported associations between striatal DA release in the LS and both NS related impulsiveness and CT in the largest sample reported to date. The findings add to the plausibility of these associations while suggesting that the effects are likely weaker than has been previously proposed.
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Affiliation(s)
- Natalia Jaworska
- Department of Psychiatry, McGill University, Montreal, Quebec, Canada
- Institue of Mental Health Research, Ottawa, Ontario, Canada
| | - Sylvia M. Cox
- Department of Psychiatry, McGill University, Montreal, Quebec, Canada
| | - Kevin F. Casey
- Le Centre Hospitalier Universitaire (CHU) Sainte-Justine, Montreal, Quebec, Canada
| | - Isabelle Boileau
- Centre for Addiction & Mental Health (CAMH), Toronto, Ontario, Canada
| | - Mariya Cherkasova
- University of British Columbia, Division of Neurology, Vancouver, British Columbia, Canada
| | - Kevin Larcher
- Montreal Neurological Institute (MNI), McGill University, Montreal, Quebec, Canada
| | - Alain Dagher
- Montreal Neurological Institute (MNI), McGill University, Montreal, Quebec, Canada
| | - Chawki Benkelfat
- Department of Psychiatry, McGill University, Montreal, Quebec, Canada
| | - Marco Leyton
- Department of Psychiatry, McGill University, Montreal, Quebec, Canada
- * E-mail:
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27
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Schrantee A, Mutsaerts HJMM, Bouziane C, Tamminga HGH, Bottelier MA, Reneman L. The age-dependent effects of a single-dose methylphenidate challenge on cerebral perfusion in patients with attention-deficit/hyperactivity disorder. Neuroimage Clin 2016; 13:123-129. [PMID: 27942455 PMCID: PMC5137172 DOI: 10.1016/j.nicl.2016.11.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 11/18/2016] [Accepted: 11/19/2016] [Indexed: 10/26/2022]
Abstract
Methylphenidate (MPH) is a stimulant drug and an effective treatment for attention-deficit/hyperactivity disorder (ADHD) in both children and adults. Pre-clinical studies suggest that the response to stimulants is dependent on age, which may reflect the ontogeny of the dopamine (DA) system, which continues to develop throughout childhood and adolescence. Therefore, the aim of this study was to investigate the modulating effect of age on the cerebral blood flow (CBF) response to MPH in stimulant treatment-naive children and adults with ADHD. Ninety-eight stimulant treatment-naive male pediatric (10-12 years) and adult (23-40 years) patients with ADHD were included in this study. The CBF response to an acute challenge with MPH (0.5 mg/kg) was measured using arterial spin labeling (ASL) pharmacological magnetic resonance imaging, as a proxy for DA function. Region-of-interest (ROI) analyses were carried out for the striatum, thalamus and medial prefrontal cortex and in addition voxel-wise analyses were conducted. An acute challenge with MPH decreased CBF in both children and adults in cortical areas, although to a greater extent in adults. In contrast, ROI analyses showed that MPH decreased thalamic CBF only in children, but not adults. Our findings highlight the importance of taking the developmental perspective into account when studying the effects of stimulants in ADHD patients.
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Affiliation(s)
- A Schrantee
- Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Amsterdam Brain and Cognition, University of Amsterdam, Amsterdam, The Netherlands
| | - HJMM Mutsaerts
- Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Sunnybrook Research Institute, University of Toronto, Toronto, ON, Canada
| | - C Bouziane
- Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - HGH Tamminga
- Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Department of Psychology, University of Amsterdam, Amsterdam, The Netherlands
| | - MA Bottelier
- Department of Child- and Adolescent Psychiatry, Triversum, Alkmaar, The Netherlands
| | - L Reneman
- Department of Radiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
- Amsterdam Brain and Cognition, University of Amsterdam, Amsterdam, The Netherlands
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28
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Turner KM, Burne THJ. Improvement of attention with amphetamine in low- and high-performing rats. Psychopharmacology (Berl) 2016; 233:3383-94. [PMID: 27469022 DOI: 10.1007/s00213-016-4376-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Accepted: 07/04/2016] [Indexed: 01/07/2023]
Abstract
RATIONALE Attentional deficits occur in a range of neuropsychiatric disorders, such as schizophrenia and attention deficit hyperactivity disorder. Psychostimulants are one of the main treatments for attentional deficits, yet there are limited reports of procognitive effects of amphetamine in preclinical studies. Therefore, task development may be needed to improve predictive validity when measuring attention in rodents. OBJECTIVES This study aimed to use a modified signal detection task (SDT) to determine if and at what doses amphetamine could improve attention in rats. METHODS Sprague-Dawley rats were trained on the SDT prior to amphetamine challenge (0.1, 0.25, 0.75 and 1.25 mg/kg). This dose range was predicted to enhance and disrupt cognition with the effect differing between individuals depending on baseline performance. RESULTS Acute low dose amphetamine (0.1 and 0.25 mg/kg) improved accuracy, while the highest dose (1.25 mg/kg) significantly disrupted performance. The effects differed for low- and high-performing groups across these doses. The effect of amphetamine on accuracy was found to significantly correlate with baseline performance in rats. CONCLUSIONS This study demonstrates that improvement in attentional performance with systemic amphetamine is dependent on baseline accuracy in rats. Indicative of the inverted U-shaped relationship between dopamine and cognition, there was a baseline-dependent shift in performance with increasing doses of amphetamine. The SDT may be a useful tool for investigating individual differences in attention and response to psychostimulants in rodents.
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Affiliation(s)
- Karly M Turner
- Queensland Brain Institute, The University of Queensland, St Lucia, 4072, QLD, Australia
| | - Thomas H J Burne
- Queensland Brain Institute, The University of Queensland, St Lucia, 4072, QLD, Australia.
- Queensland Centre for Mental Health Research, The Park Centre for Mental Health, Richlands, QLD, 4077, Australia.
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29
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Wolff N, Rubia K, Knopf H, Hölling H, Martini J, Ehrlich S, Roessner V. Reduced pain perception in children and adolescents with ADHD is normalized by methylphenidate. Child Adolesc Psychiatry Ment Health 2016; 10:24. [PMID: 27453723 PMCID: PMC4957360 DOI: 10.1186/s13034-016-0112-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 06/29/2016] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND The present study examined pain perception in children and adolescents with ADHD and the interaction between pain perception and the administration of methylphenidate (MPH) in order to generate hypotheses for further research that will help to clarify the association between ADHD diagnosis, MPH treatment and pain perception. METHODS We included 260 children and adolescents of the "German Health Interview and Examination Survey for Children and Adolescents" (KiGGS) and analyzed parent's assessments of children's pain distribution and pain perception, as well as the influence of MPH administration on pain perception in affected children and adolescents. RESULTS Pain perception was associated with ADHD and MPH administration, indicating that children and adolescents suffering from ADHD without MPH treatment were reported to have lower pain perception compared to both, healthy controls (HC) and ADHD patients medicated with MPH. CONCLUSION We suggest that reduced pain perception in children and adolescents with ADHD not medicated with MPH may lead to higher risk tolerance by misjudgments of dangerous situations, expanding the importance of MPH administration in affected children and adolescents.
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Affiliation(s)
- Nicole Wolff
- Department of Child and Adolescent Psychiatry, Faculty of Medicine, TU Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Katya Rubia
- Department of Child and Adolescent Psychiatry, Institute of Psychiatry, King’s College London, London, UK
| | - Hildtraud Knopf
- Department of Epidemiology and Health Monitoring, Robert Koch Institute, Berlin, Germany
| | - Heike Hölling
- Department of Epidemiology and Health Monitoring, Robert Koch Institute, Berlin, Germany
| | - Julia Martini
- Department of Child and Adolescent Psychiatry, Faculty of Medicine, TU Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Stefan Ehrlich
- Department of Child and Adolescent Psychiatry, Faculty of Medicine, TU Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
| | - Veit Roessner
- Department of Child and Adolescent Psychiatry, Faculty of Medicine, TU Dresden, Fetscherstrasse 74, 01307 Dresden, Germany
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30
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Kolla NJ, Dunlop K, Downar J, Links P, Bagby RM, Wilson AA, Houle S, Rasquinha F, Simpson AI, Meyer JH. Association of ventral striatum monoamine oxidase-A binding and functional connectivity in antisocial personality disorder with high impulsivity: A positron emission tomography and functional magnetic resonance imaging study. Eur Neuropsychopharmacol 2016; 26:777-86. [PMID: 26908392 DOI: 10.1016/j.euroneuro.2015.12.030] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 12/07/2015] [Accepted: 12/14/2015] [Indexed: 01/13/2023]
Abstract
Impulsivity is a core feature of antisocial personality disorder (ASPD) associated with abnormal brain function and neurochemical alterations. The ventral striatum (VS) is a key region of the neural circuitry mediating impulsive behavior, and low monoamine oxidase-A (MAO-A) level in the VS has shown a specific relationship to the impulsivity of ASPD. Because it is currently unknown whether phenotypic MAO-A markers can influence brain function in ASPD, we investigated VS MAO-A level and the functional connectivity (FC) of two seed regions, superior and inferior VS (VSs, VSi). Nineteen impulsive ASPD males underwent [(11)C] harmine positron emission tomography scanning to measure VS MAO-A VT, an index of MAO-A density, and resting-state functional magnetic resonance imaging that assessed the FC of bilateral seed regions in the VSi and VSs. Subjects also completed self-report impulsivity measures. Results revealed functional coupling of the VSs with bilateral dorsomedial prefrontal cortex (DMPFC) that was correlated with VS MAO-A VT (r=0.47, p=0.04), and functional coupling of the VSi with right hippocampus that was anti-correlated with VS MAO-A VT (r=-0.55, p=0.01). Additionally, VSs-DMPFC FC was negatively correlated with NEO Personality Inventory-Revised impulsivity (r=-0.49, p=0.03), as was VSi-hippocampus FC with Barratt Impulsiveness Scale-11 motor impulsiveness (r=-0.50, p=0.03). These preliminary results highlight an association of VS MAO-A level with the FC of striatal regions linked to impulsive behavior in ASPD and suggest that phenotype-based brain markers of ASPD have relevance to understanding brain function.
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Affiliation(s)
- Nathan J Kolla
- CAMH Research Imaging Centre, Canada; Campbell Family Mental Health Research Institute, CAMH, Canada; Department of Psychiatry, University of Toronto, Canada; Institute of Medical Science, University of Toronto, Canada.
| | - Katharine Dunlop
- Institute of Medical Science, University of Toronto, Canada; University Health Network, Canada
| | - Jonathan Downar
- Department of Psychiatry, University of Toronto, Canada; Institute of Medical Science, University of Toronto, Canada; University Health Network, Canada
| | - Paul Links
- Institute of Medical Science, University of Toronto, Canada; Department of Psychiatry, University of Western Ontario, Canada
| | - R Michael Bagby
- CAMH Research Imaging Centre, Canada; Department of Psychiatry, University of Toronto, Canada; Department of Psychology, University of Toronto, Canada
| | - Alan A Wilson
- CAMH Research Imaging Centre, Canada; Campbell Family Mental Health Research Institute, CAMH, Canada; Department of Psychiatry, University of Toronto, Canada; Institute of Medical Science, University of Toronto, Canada
| | - Sylvain Houle
- CAMH Research Imaging Centre, Canada; Campbell Family Mental Health Research Institute, CAMH, Canada; Department of Psychiatry, University of Toronto, Canada
| | - Fawn Rasquinha
- CAMH Research Imaging Centre, Canada; Campbell Family Mental Health Research Institute, CAMH, Canada
| | | | - Jeffrey H Meyer
- CAMH Research Imaging Centre, Canada; Campbell Family Mental Health Research Institute, CAMH, Canada; Department of Psychiatry, University of Toronto, Canada; Institute of Medical Science, University of Toronto, Canada
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31
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Childress A, Tran C. Current Investigational Drugs for the Treatment of Attention-Deficit/Hyperactivity Disorder. Expert Opin Investig Drugs 2016; 25:463-74. [DOI: 10.1517/13543784.2016.1147558] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Manza P, Hu S, Ide JS, Farr OM, Zhang S, Leung HC, Li CSR. The effects of methylphenidate on cerebral responses to conflict anticipation and unsigned prediction error in a stop-signal task. J Psychopharmacol 2016; 30:283-93. [PMID: 26755547 PMCID: PMC4837899 DOI: 10.1177/0269881115625102] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
To adapt flexibly to a rapidly changing environment, humans must anticipate conflict and respond to surprising, unexpected events. To this end, the brain estimates upcoming conflict on the basis of prior experience and computes unsigned prediction error (UPE). Although much work implicates catecholamines in cognitive control, little is known about how pharmacological manipulation of catecholamines affects the neural processes underlying conflict anticipation and UPE computation. We addressed this issue by imaging 24 healthy young adults who received a 45 mg oral dose of methylphenidate (MPH) and 62 matched controls who did not receive MPH prior to performing the stop-signal task. We used a Bayesian Dynamic Belief Model to make trial-by-trial estimates of conflict and UPE during task performance. Replicating previous research, the control group showed anticipation-related activation in the presupplementary motor area and deactivation in the ventromedial prefrontal cortex and parahippocampal gyrus, as well as UPE-related activations in the dorsal anterior cingulate, insula, and inferior parietal lobule. In group comparison, MPH increased anticipation activity in the bilateral caudate head and decreased UPE activity in each of the aforementioned regions. These findings highlight distinct effects of catecholamines on the neural mechanisms underlying conflict anticipation and UPE, signals critical to learning and adaptive behavior.
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Affiliation(s)
- Peter Manza
- Integrative Neuroscience Program, Department of Psychology, Stony Brook University, Stony Brook, NY, USA Department of Psychiatry, Yale University, New Haven, CT, USA
| | - Sien Hu
- Department of Psychiatry, Yale University, New Haven, CT, USA
| | - Jaime S Ide
- Department of Psychiatry, Yale University, New Haven, CT, USA Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY, USA
| | - Olivia M Farr
- Department of Psychiatry, Yale University, New Haven, CT, USA Beth Israel Deaconess Medical Center/Harvard Medical School, Boston, MA, USA
| | - Sheng Zhang
- Department of Psychiatry, Yale University, New Haven, CT, USA
| | - Hoi-Chung Leung
- Integrative Neuroscience Program, Department of Psychology, Stony Brook University, Stony Brook, NY, USA
| | - Chiang-shan R Li
- Department of Psychiatry, Yale University, New Haven, CT, USA Department of Neuroscience, Yale University, New Haven, CT, USA Interdepartmental Neuroscience Program, Yale University, New Haven, CT, USA
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Badgaiyan RD, Sinha S, Sajjad M, Wack DS. Attenuated Tonic and Enhanced Phasic Release of Dopamine in Attention Deficit Hyperactivity Disorder. PLoS One 2015; 10:e0137326. [PMID: 26422146 PMCID: PMC4589406 DOI: 10.1371/journal.pone.0137326] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Accepted: 08/02/2015] [Indexed: 11/18/2022] Open
Abstract
It is unclear whether attention deficit hyperactive disorder (ADHD) is a hypodopaminergic or hyperdopaminergic condition. Different sets of data suggest either hyperactive or hypoactive dopamine system. Since indirect methods used in earlier studies have arrived at contradictory conclusions, we directly measured the tonic and phasic release of dopamine in ADHD volunteers. The tonic release in ADHD and healthy control volunteers was measured and compared using dynamic molecular imaging technique. The phasic release during performance of Eriksen's flanker task was measured in the two groups using single scan dynamic molecular imaging technique. In these experiments volunteers were positioned in a positron emission tomography (PET) camera and administered a dopamine receptor ligand (11)C-raclopride intravenously. After the injection PET data were acquired dynamically while volunteers either stayed still (tonic release experiments) or performed the flanker task (phasic release experiments). PET data were analyzed to measure dynamic changes in ligand binding potential (BP) and other receptor kinetic parameters. The analysis revealed that at rest the ligand BP was significantly higher in the right caudate of ADHD volunteers suggesting reduced tonic release. During task performance significantly lower ligand BP was observed in the same area, indicating increased phasic release. In ADHD tonic release of dopamine is attenuated and the phasic release is enhanced in the right caudate. By characterizing the nature of dysregulated dopamine neurotransmission in ADHD, the results explain earlier findings of reduced or increased dopaminergic activity.
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Affiliation(s)
- Rajendra D. Badgaiyan
- Molecular and Functional Imaging Laboratory, Department of Psychiatry, University of Minnesota, Minneapolis, Minnesota, United States of America
- Neuromodulation Program, University of Minnesota Twin City Campus, Minneapolis, Minnesota, United States of America
- Laboratory of Advanced Radiochemistry, University of Minnesota Twin City Campus, Minneapolis, Minnesota, United States of America
- * E-mail:
| | - Sampada Sinha
- Molecular and Functional Imaging Laboratory, Department of Psychiatry, University of Minnesota, Minneapolis, Minnesota, United States of America
| | - Munawwar Sajjad
- Department of Nuclear Medicine, University at Buffalo, Buffalo, New York, United States of America
| | - David S. Wack
- Department of Nuclear Medicine, University at Buffalo, Buffalo, New York, United States of America
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Vanicek T, Spies M, Rami-Mark C, Savli M, Höflich A, Kranz GS, Hahn A, Kutzelnigg A, Traub-Weidinger T, Mitterhauser M, Wadsak W, Hacker M, Volkow ND, Kasper S, Lanzenberger R. The norepinephrine transporter in attention-deficit/hyperactivity disorder investigated with positron emission tomography. JAMA Psychiatry 2014; 71:1340-1349. [PMID: 25338091 PMCID: PMC4699255 DOI: 10.1001/jamapsychiatry.2014.1226] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
IMPORTANCE Attention-deficit/hyperactivity disorder (ADHD) research has long focused on the dopaminergic system's contribution to pathogenesis, although the results have been inconclusive. However, a case has been made for the involvement of the noradrenergic system, which modulates cognitive processes, such as arousal, working memory, and response inhibition, all of which are typically affected in ADHD. Furthermore, the norepinephrine transporter (NET) is an important target for frequently prescribed medication in ADHD. Therefore, the NET is suggested to play a critical role in ADHD. OBJECTIVE To explore the differences in NET nondisplaceable binding potential (NET BPND) using positron emission tomography and the highly selective radioligand (S,S)-[18F]FMeNER-D2 [(S,S)-2-(α-(2-[18F]fluoro[2H2]methoxyphenoxy)benzyl)morpholine] between adults with ADHD and healthy volunteers serving as controls. DESIGN, SETTING, AND PARTICIPANTS Twenty-two medication-free patients with ADHD (mean [SD] age, 30.7 [10.4] years; 15 [68%] men) without psychiatric comorbidities and 22 age- and sex-matched healthy controls (30.9 [10.6] years; 15 [68%] men) underwent positron emission tomography once. A linear mixed model was used to compare NET BPND between groups. MAIN OUTCOMES AND MEASURES The NET BPND in selected regions of interest relevant for ADHD, including the hippocampus, putamen, pallidum, thalamus, midbrain with pons (comprising a region of interest that includes the locus coeruleus), and cerebellum. In addition, the NET BPND was evaluated in thalamic subnuclei (13 atlas-based regions of interest). RESULTS We found no significant differences in NET availability or regional distribution between patients with ADHD and healthy controls in all investigated brain regions (F1,41<0.01; P=.96). Furthermore, we identified no significant association between ADHD symptom severity and regional NET availability. Neither sex nor smoking status influenced NET availability. We determined a significant negative correlation between age and NET availability in the thalamus (R2=0.29; P<.01 corrected) and midbrain with pons, including the locus coeruleus (R2=0.18; P<.01 corrected), which corroborates prior findings of a decrease in NET availability with aging in the human brain. CONCLUSIONS AND RELEVANCE Our results do not indicate involvement of changes in brain NET availability or distribution in the pathogenesis of ADHD. However, the noradrenergic transmitter system may be affected on a different level, such as in cortical regions, which cannot be reliably quantified with this positron emission tomography ligand. Alternatively, different key proteins of noradrenergic neurotransmission might be affected.
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Affiliation(s)
- Thomas Vanicek
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Marie Spies
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Christina Rami-Mark
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Markus Savli
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Anna Höflich
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Georg S. Kranz
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Andreas Hahn
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Alexandra Kutzelnigg
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Tatjana Traub-Weidinger
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Markus Mitterhauser
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Wolfgang Wadsak
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Marcus Hacker
- Division of Nuclear Medicine, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Nora D. Volkow
- National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland
| | - Siegfried Kasper
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Rupert Lanzenberger
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
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