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Becker S, Chowdhury M, Tavilsup P, Seitz D, Callahan BL. Risk of neurodegenerative disease or dementia in adults with attention-deficit/hyperactivity disorder: a systematic review. Front Psychiatry 2023; 14:1158546. [PMID: 37663597 PMCID: PMC10469775 DOI: 10.3389/fpsyt.2023.1158546] [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: 02/04/2023] [Accepted: 08/02/2023] [Indexed: 09/05/2023] Open
Abstract
Purpose of review Several psychiatric disorders have been associated with an increased risk of developing a neurodegenerative disease and/or dementia. Attention-deficit/hyperactivity disorder (ADHD), a neurodevelopmental disorder, has been understudied in relation to dementia risk. We summarized existing literature investigating the risk of incident neurodegenerative disease or dementia associated with ADHD. Recent findings We searched five databases for cohort, case-control, and clinical trial studies investigating associations between ADHD and neurodegenerative diseases/dementia in May 2023. Study characteristics were extracted by two independent raters, and risk of bias was assessed using the Newcastle Ottawa Scale. Search terms yielded 2,137 articles, and seven studies (five cohort and two case-control studies) ultimately met inclusion criteria. Studies examined the following types of neurodegeneration: all-cause dementia, Alzheimer's disease, Parkinson's and Lewy body diseases, vascular dementia, and mild cognitive impairment. Heterogeneity in study methodology, particularly covariates used in analyses and types of ratios for risk reported, prevented a meta-analysis and data were therefore summarized as a narrative synthesis. The majority of studies (4/7) demonstrated an overall low risk of bias. Summary The current literature on risk of developing a neurodegenerative disease in ADHD is limited. Although the studies identified present evidence for a link between ADHD and subsequent development of dementia, the magnitude of the direct effect of ADHD on neurodegeneration is yet to be determined and better empirically designed studies are first needed. Furthermore, the mechanism of how or why ADHD is associated with an increased risk of developing a neurocognitive disorder is still unclear and should be explored in future studies. Systematic review registration https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42022348976, the PROSPERO number is CRD42022348976.
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Affiliation(s)
- Sara Becker
- Department of Psychology, University of Calgary, Calgary, AB, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - Mohammad Chowdhury
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
- Department of Psychiatry, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Pattara Tavilsup
- Department of Psychiatry, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Dallas Seitz
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
- Department of Psychiatry, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Brandy L. Callahan
- Department of Psychology, University of Calgary, Calgary, AB, Canada
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
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Zhao M, Meng Y, Cao B, Tong J, Liu X, Yan H, Yang H, Han H, Liang X, Chen H. A bibliometric analysis of studies on gut microbiota in attention-deficit and hyperactivity disorder from 2012 to 2021. Front Microbiol 2023; 14:1055804. [PMID: 37007507 PMCID: PMC10050751 DOI: 10.3389/fmicb.2023.1055804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 02/27/2023] [Indexed: 03/17/2023] Open
Abstract
BackgroundAn increasing number of studies have focused on the role of gut microbiota in the treatment of ADHD, but its related molecular mechanisms are not yet clear, and there is still room for development of studies targeting this area. This study analyzes publications from 2012 to 2021 in a comprehensive and multi-faceted visualization, with the aim of grasping the existing research profile and guiding scholars to make more in-depth studies.MethodsThe 1,677 articles and 298 review articles on gut microbiota in ADHD were retrieved from the Web of Science Core Collection. CiteSpace, VOSviewer, Microsoft Excel 2019, Scimago Graphica, Bibliometrix and Pajek metrics software were used for visualization and analysis of the included literature.ResultsOn August 3, 2022, a total of 1975 English-language articles on gut microbiota in ADHD were retrieved from Web of Science Core Collection (WoSCC) from January 2012 to December 2021, with a steady upward trend in the number of articles published in this field over the decade. The top three countries in terms of the number of articles published are the United States, China, and Spain. Meanwhile, CONSEJO SUPERIOR DE INVESTIGACIONES CIENTIFICAS CSIC, UNIV OF CALIFORNIA SYSTEM, and UDICE FRENCH RESEARCH UNIV have made significant contributions in this field. In the analysis of the published journals, PLoS One was not only the first in terms of number of articles published but also the most cited. Wang J was the most prolific author and CAPORASO JG ranked first in terms of co-cited authors. In addition, “Diet rapidly and reproducibly alters the human gut microbiome,” published by David LA et al., has the highest citation frequency in this field. The most frequently occurring keyword was “gut microbiota.”ConclusionThe results of this paper clarify the current status of research on gut microbiota in ADHD. Based on the research on the mechanism of gut microbiota in other diseases, there is reason to believe that the exploration of gut microbiota in ADHD must be increasingly mature. And the study speculates that future research may focus on “nutrition supplements,” “lipid metabolism,” and “gut brain axis.” It is imperative to promote a closer international cooperation among scholars in this field.
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Affiliation(s)
- Mingyi Zhao
- Department of Pediatrics, The Third Xiangya Hopsital, Central South University, Changsha, Hunan, China
| | - Yang Meng
- Department of Pediatrics, The Third Xiangya Hopsital, Central South University, Changsha, Hunan, China
| | - Buzi Cao
- Department of Pediatrics, The Third Xiangya Hopsital, Central South University, Changsha, Hunan, China
- Medical School, Hunan Normal University, Changsha, China
| | - Jianbin Tong
- Department of Anesthesiology, The Third Xiangya Hopsital, Central South University, Changsha, Hunan, China
- Hunan Province Key Laboratory of Brain Homeostasis, The Third Xiangya Hopsital, Central South University, Changsha, Hunan, China
| | - Xiaoying Liu
- Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Hao Yan
- Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Hanqi Yang
- Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Houzhi Han
- Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Xiaobing Liang
- Xiangya School of Medicine, Central South University, Changsha, Hunan, China
| | - Hui Chen
- Department of Clinical Laboratory, The Third Xiangya Hopsital, Central South University, Changsha, Hunan, China
- *Correspondence: Hui Chen,
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Carreón-Trujillo S, Vázquez-González D, Corona JC. Atomoxetine Decreases Mitochondrial Biogenesis, Fission and Fusion In Human Neuron-like Cells But Does Not Alter Antioxidant Defences. Cell Biochem Biophys 2023; 81:105-115. [PMID: 36346546 DOI: 10.1007/s12013-022-01116-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 10/30/2022] [Indexed: 11/10/2022]
Abstract
Atomoxetine (ATX) is a presynaptic norepinephrine transporter (NET) inhibitor widely prescribed for attention-deficit/hyperactivity disorder (ADHD) due to its low abuse potential and absence of psychostimulant effects. While NET inhibition is implicated in the clinical response, several additional pharmacoactivities may contribute to clinical efficacy or unwanted side effects. We recently reported that ATX can dose-dependently alter mitochondrial function and cellular redox status. Here, we assessed potential alterations in mitochondrial biogenesis, mitochondrial dynamics and cellular antioxidant capacity following high- and low-dose ATX treatment of differentiated human neuroblastoma cells. Human SH-SY5Y neuroblastoma cells were treated with ATX (1, 5, 10, 20 and 50 μM) for 7 days under differentiation culture conditions. Changes in the expression levels of protein markers for mitochondrial biogenesis, fusion and fission as well as of antioxidant proteins were analysed by Western blot. High-dose ATX (50 μM) reduced while low-dose ATX (10 μM) increased mitochondrial biogenesis as evidenced by parallel changes in SDHA, COX-I, PGC1α and TFAM expression. High-dose ATX also reduced mitochondrial fusion as evidenced by OPA1 and MFN2 downregulation, and mitochondrial fission as indicated by DRP1 and Fis1 downregulation. In contrast, ATX did not alter expression of the antioxidant enzymes SOD1 and catalase, the phase II transcription factor Nfr2, or the Nfr2-regulated antioxidant enzyme NQO1. Clinical responses and side effects of ATX may be mediated by dose-dependent modulation of mitochondrial biogenesis and dynamics as well as NET inhibition.
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Affiliation(s)
- Sonia Carreón-Trujillo
- Laboratory of Neurosciences, Hospital Infantil de México Federico Gómez, 06720, Mexico City, Mexico
| | - Daniela Vázquez-González
- Laboratory of Neurosciences, Hospital Infantil de México Federico Gómez, 06720, Mexico City, Mexico
| | - Juan Carlos Corona
- Laboratory of Neurosciences, Hospital Infantil de México Federico Gómez, 06720, Mexico City, Mexico.
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Koevoet D, Deschamps PKH, Kenemans JL. Catecholaminergic and cholinergic neuromodulation in autism spectrum disorder: A comparison to attention-deficit hyperactivity disorder. Front Neurosci 2023; 16:1078586. [PMID: 36685234 PMCID: PMC9853424 DOI: 10.3389/fnins.2022.1078586] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 12/15/2022] [Indexed: 01/09/2023] Open
Abstract
Autism spectrum disorder (ASD) is a heterogeneous neurodevelopmental disorder characterized by social impairments and restricted, repetitive behaviors. Treatment of ASD is notoriously difficult and might benefit from identification of underlying mechanisms that overlap with those disturbed in other developmental disorders, for which treatment options are more obvious. One example of the latter is attention-deficit hyperactivity disorder (ADHD), given the efficacy of especially stimulants in treatment of ADHD. Deficiencies in catecholaminergic systems [dopamine (DA), norepinephrine (NE)] in ADHD are obvious targets for stimulant treatment. Recent findings suggest that dysfunction in catecholaminergic systems may also be a factor in at least a subgroup of ASD. In this review we scrutinize the evidence for catecholaminergic mechanisms underlying ASD symptoms, and also include in this analysis a third classic ascending arousing system, the acetylcholinergic (ACh) network. We complement this with a comprehensive review of DA-, NE-, and ACh-targeted interventions in ASD, and an exploratory search for potential treatment-response predictors (biomarkers) in ASD, genetically or otherwise. Based on this review and analysis we propose that (1) stimulant treatment may be a viable option for an ASD subcategory, possibly defined by genetic subtyping; (2) cerebellar dysfunction is pronounced for a relatively small ADHD subgroup but much more common in ASD and in both cases may point toward NE- or ACh-directed intervention; (3) deficiency of the cortical salience network is sizable in subgroups of both disorders, and biomarkers such as eye blink rate and pupillometric data may predict the efficacy of targeting this underlying deficiency via DA, NE, or ACh in both ASD and ADHD.
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Affiliation(s)
- Damian Koevoet
- Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, Netherlands,*Correspondence: Damian Koevoet,
| | - P. K. H. Deschamps
- Department of Psychiatry, University Medical Center Utrecht, Utrecht, Netherlands
| | - J. L. Kenemans
- Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, Netherlands
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5
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Channer B, Matt SM, Nickoloff-Bybel EA, Pappa V, Agarwal Y, Wickman J, Gaskill PJ. Dopamine, Immunity, and Disease. Pharmacol Rev 2023; 75:62-158. [PMID: 36757901 PMCID: PMC9832385 DOI: 10.1124/pharmrev.122.000618] [Citation(s) in RCA: 51] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 08/02/2022] [Accepted: 08/04/2022] [Indexed: 12/14/2022] Open
Abstract
The neurotransmitter dopamine is a key factor in central nervous system (CNS) function, regulating many processes including reward, movement, and cognition. Dopamine also regulates critical functions in peripheral organs, such as blood pressure, renal activity, and intestinal motility. Beyond these functions, a growing body of evidence indicates that dopamine is an important immunoregulatory factor. Most types of immune cells express dopamine receptors and other dopaminergic proteins, and many immune cells take up, produce, store, and/or release dopamine, suggesting that dopaminergic immunomodulation is important for immune function. Targeting these pathways could be a promising avenue for the treatment of inflammation and disease, but despite increasing research in this area, data on the specific effects of dopamine on many immune cells and disease processes remain inconsistent and poorly understood. Therefore, this review integrates the current knowledge of the role of dopamine in immune cell function and inflammatory signaling across systems. We also discuss the current understanding of dopaminergic regulation of immune signaling in the CNS and peripheral tissues, highlighting the role of dopaminergic immunomodulation in diseases such as Parkinson's disease, several neuropsychiatric conditions, neurologic human immunodeficiency virus, inflammatory bowel disease, rheumatoid arthritis, and others. Careful consideration is given to the influence of experimental design on results, and we note a number of areas in need of further research. Overall, this review integrates our knowledge of dopaminergic immunology at the cellular, tissue, and disease level and prompts the development of therapeutics and strategies targeted toward ameliorating disease through dopaminergic regulation of immunity. SIGNIFICANCE STATEMENT: Canonically, dopamine is recognized as a neurotransmitter involved in the regulation of movement, cognition, and reward. However, dopamine also acts as an immune modulator in the central nervous system and periphery. This review comprehensively assesses the current knowledge of dopaminergic immunomodulation and the role of dopamine in disease pathogenesis at the cellular and tissue level. This will provide broad access to this information across fields, identify areas in need of further investigation, and drive the development of dopaminergic therapeutic strategies.
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Affiliation(s)
- Breana Channer
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania (B.C., S.M.M., E.A.N-B., Y.A., J.W., P.J.G.); and The Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania (V.P.)
| | - Stephanie M Matt
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania (B.C., S.M.M., E.A.N-B., Y.A., J.W., P.J.G.); and The Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania (V.P.)
| | - Emily A Nickoloff-Bybel
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania (B.C., S.M.M., E.A.N-B., Y.A., J.W., P.J.G.); and The Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania (V.P.)
| | - Vasiliki Pappa
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania (B.C., S.M.M., E.A.N-B., Y.A., J.W., P.J.G.); and The Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania (V.P.)
| | - Yash Agarwal
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania (B.C., S.M.M., E.A.N-B., Y.A., J.W., P.J.G.); and The Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania (V.P.)
| | - Jason Wickman
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania (B.C., S.M.M., E.A.N-B., Y.A., J.W., P.J.G.); and The Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania (V.P.)
| | - Peter J Gaskill
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pennsylvania (B.C., S.M.M., E.A.N-B., Y.A., J.W., P.J.G.); and The Children's Hospital of Philadelphia Research Institute, Philadelphia, Pennsylvania (V.P.)
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6
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Vázquez-González D, Carreón-Trujillo S, Alvarez-Arellano L, Abarca-Merlin DM, Domínguez-López P, Salazar-García M, Corona JC. A Potential Role for Neuroinflammation in ADHD. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1411:327-356. [PMID: 36949317 DOI: 10.1007/978-981-19-7376-5_15] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
Attention deficit hyperactivity disorder (ADHD) is a neurobehavioural disorder in children and adolescents. Although increases in oxidative stress and disturbances of neurotransmitter system such as the dopaminergic and abnormalities in several brain regions have been demonstrated, the pathophysiology of ADHD is not fully understood. Nevertheless, ADHD involves several factors that have been associated with an increase in neuroinflammation. This chapter presents an overview of factors that may increase neuroinflammation and play a potential role in the development and pathophysiology of ADHD. The altered immune response, polymorphisms in inflammatory-related genes, ADHD comorbidity with autoimmune and inflammatory disorders and prenatal exposure to inflammation are associated with alterations in offspring brain development and are a risk factor; genetic and environmental risk factors that may increase the risk for ADHD and medications can increase neuroinflammation. Evidence of an association between these factors has been an invaluable tool for research on inflammation in ADHD. Therefore, evidence studies have made it possible to generate alternative therapeutic interventions using natural products as anti-inflammatories that could have great potential against neuroinflammation in ADHD.
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Affiliation(s)
| | - Sonia Carreón-Trujillo
- Laboratory of Neurosciences, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
| | | | | | - Pablo Domínguez-López
- Unidad de Investigación Médica en Medicina Reproductiva, Hospital Gineco-Obstetricia, IMSS, Mexico City, Mexico
| | - Marcela Salazar-García
- Laboratorio de Investigación en Biología del Desarrollo y Teratogénesis Experimental, Hospital Infantil de México Federico Gómez, Mexico City, Mexico
| | - Juan Carlos Corona
- Laboratory of Neurosciences, Hospital Infantil de México Federico Gómez, Mexico City, Mexico.
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7
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Pai LF, Wang DS, Hsu WF, Huang SW, Chung CH, Chen SJ, Chien WC, Chu DM. New insights into precocious puberty and ADHD: a nationwide cohort study. Pediatr Res 2022; 92:1787-1794. [PMID: 35347278 DOI: 10.1038/s41390-022-02028-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 02/09/2022] [Accepted: 02/23/2022] [Indexed: 12/30/2022]
Abstract
BACKGROUND Attention deficit-hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders in children; however, studies delineating the association between ADHD and central precocious puberty are limited. This study aimed to understand whether children with ADHD are at a higher risk of central precocious puberty. METHODS This population-based retrospective cohort study was conducted using the National Health Insurance Research Database of Taiwan to investigate the association between ADHD and the incidence of central precocious puberty between 2000-2015. We identified ADHD individuals treated with methylphenidate, atomoxetine or not. The control cohort consisted of individuals without ADHD. The outcome measure was central precocious puberty diagnosis. RESULTS Among 290,148 children (mean age: 5.83 years), central precocious puberty incidence was 4.24 and 1.95 per 105 person-years in the ADHD and control groups, respectively. Children with ADHD treated with medication had a higher risk than those without ADHD. However, medication use did not affect the incidence of central precocious puberty among children with ADHD. CONCLUSION This study showed an association between ADHD and a higher risk of central precocious puberty. Early referral of children with ADHD to a pediatric endocrinologist for evaluation may facilitate correct diagnoses and early interventions. IMPACT ADHD is associated with a higher risk of central precocious puberty. This study provides relevant findings, as it is the first nationwide, population-based cohort study to investigate the association between ADHD and the risk of central precocious puberty with a 15-year follow-up. Early referral of children with ADHD to a pediatric endocrinologist for the evaluation of suspected precocious puberty could facilitate correct diagnosis. Early intervention treatment with gonadotropin-releasing hormone agonist might improve final height in children with central precocious puberty.
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Affiliation(s)
- Li-Fan Pai
- Department of Pediatrics, Tri-service General Hospital, Taipei, Taiwan.,School of Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Der-Shiun Wang
- Department of Pediatrics, Tri-service General Hospital, Taipei, Taiwan.,School of Medicine, National Defense Medical Center, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Wan-Fu Hsu
- Department of Pediatrics, Tri-service General Hospital, Taipei, Taiwan.,School of Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Shao-Wei Huang
- Department of Pediatrics, Tri-service General Hospital, Taipei, Taiwan.,School of Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Chi-Hsiang Chung
- School of Public Health, National Defense Medical Center, Taipei, Taiwan.,Department of Medical Research, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Shyi-Jou Chen
- Department of Pediatrics, Tri-service General Hospital, Taipei, Taiwan.,School of Medicine, National Defense Medical Center, Taipei, Taiwan
| | - Wu-Chien Chien
- School of Public Health, National Defense Medical Center, Taipei, Taiwan. .,Department of Medical Research, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan. .,Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan. .,Taiwanese Injury Prevention and Safety Promotion Association, Taipei, Taiwan.
| | - Der-Ming Chu
- Department of Pediatrics, Tri-service General Hospital, Taipei, Taiwan. .,School of Medicine, National Defense Medical Center, Taipei, Taiwan.
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Wu Y, Li Y, Zhu J, Long J. Shared genetics and causality underlying epilepsy and attention-deficit hyperactivity disorder. Psychiatry Res 2022; 316:114794. [PMID: 35994864 DOI: 10.1016/j.psychres.2022.114794] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/06/2022] [Accepted: 08/12/2022] [Indexed: 11/18/2022]
Abstract
The prevalence of attention deficit hyperactivity disorder (ADHD) in patients with epilepsy was much higher than prevalence in general population, and vice versa. The mechanisms underlying comorbid ADHD and epilepsy remained largely unknown. Here, we systematically analyzed the genetic correlation, causality, shared genetics and specific trait related tissues by using linkage disequilibrium score regression (LDSC), two sample Mendelian randomization (TwoSampleMR), bivariate causal mixture model (MiXeR), conjunctional false discovery rate (conjFDR) and LDSC applied to specifically expressed genes based on genome wide association studies (GWASs) data of ADHD and epilepsy. We found that ADHD had significant positive genetic association with epilepsy. Two-sample Mendelian randomization analysis with genome wide significant single nucleotide polymorphisms (SNPs) as instrument variables suggested a positively causal effect of ADHD on epilepsy. Using MiXeR, which estimates the total amount of shared variants, we observed 1 K causal variants overlapped between ADHD and epilepsy. At conjFDR <0.05, ADHD shared 2 distinct genomic loci with Epilepsy. Further disease-relevant tissues analysis showed that cortex, substantia nigra, amygdala and hippocampus were both associated with ADHD and epilepsy. Our results suggested that ADHD was genetically correlated with epilepsy, which might be due to the fact that they shared common pathogenic sites and tissues origin.
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Affiliation(s)
- Yong Wu
- Research Center for Mental Health and Neuroscience, Wuhan Mental Health Center, Wuhan, Hubei 430012, China
| | - Yichen Li
- Radiology Department, Wuhan Mental Health Center, Wuhan, Hubei 430012, China
| | - Junhong Zhu
- Department of Mental Rehabilitation, Wuhan Mental Health Center, Wuhan, Hubei 430012, China.
| | - Jingyi Long
- Department of Child & Adolescent Psychiatry, Wuhan Mental Health Center, Wuhan, Hubei 430012, China.
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Le TV, Lee SW. Core-shell Au-Ag nanoparticles as colorimetric sensing probes for highly selective detection of a dopamine neurotransmitter under different pH conditions. Dalton Trans 2022; 51:15675-15685. [PMID: 36172825 DOI: 10.1039/d2dt02185d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dopamine (DA) is a vital biomarker for the early diagnosis of dopaminergic dysfunction; therefore, it is important to establish a direct and selective detection tool for DA neurotransmitters. This work reports facilely synthesized Au-Ag core-shell nanoparticles (Au@Ag NPs) as colorimetric sensing probes for highly selective detection of the DA neurotransmitter. Our sensing strategy is based on DA-mediated aggregation of the Au@Ag NPs, which can show a distinct color transition from yellow to greenish grey. With the increase of pH from 6 to 10, the response time of colorimetric transition was significantly reduced by a factor of 10 and the limit of detection (LOD) for DA by a spectroscopic device was estimated to be 0.08 μM. Notably, optimized sensing probes of Au@Ag NPs at pH 10 demonstrated an excellent selectivity to DA against various interfering components (including catecholamines (norepinephrine and epinephrine), lysine, glutamic acid, glucose, or metal ions). Our sensing system also exhibited the reliable detection of DA in spiked human serum with the relative standard deviation lower than 4.0%, suggesting its possible application to the direct detection of DA in biological fluids.
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Affiliation(s)
- Thanh-Van Le
- Department of Chemical and Biological Engineering, Gachon University, Seongnam 461-701, South Korea.
| | - Sang-Wha Lee
- Department of Chemical and Biological Engineering, Gachon University, Seongnam 461-701, South Korea.
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10
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Xing J, Zhang Y, Xu S, Zeng X. Nanomaterial assisted diagnosis of dopamine to determine attention deficit hyperactivity disorder - ‘An issue with Chinese children’. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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Kian N, Samieefar N, Rezaei N. Prenatal risk factors and genetic causes of ADHD in children. World J Pediatr 2022; 18:308-319. [PMID: 35235183 DOI: 10.1007/s12519-022-00524-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 02/07/2022] [Indexed: 12/18/2022]
Abstract
BACKGROUND Attention deficit/hyperactivity disorder (ADHD) is a common disease among children; it affected 5-7% of the population in 2015. ADHD is a multifactorial disease, and its etiology is still not clearly understood. DATA SOURCES This narrative review has been done by searching the PubMed and Embase databases using attention deficit/hyperactivity disorder, ADHD, risk factors; genetics; pediatrics; psychiatrics as keywords. RESULTS ADHD is considered to be a hereditary disorder in which genes play the fundamental role in the pathogenesis; however, findings from genetic-environmental studies support the hypothesis that genetic factors can exert effects on an individual's condition by determining his/her responses to environmental exposures, especially those during the prenatal stage. CONCLUSION ADHD is considered as a hereditary disorder in which genes and prenatal risk factors play fundamental roles in the pathogenesis.
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Affiliation(s)
- Naghmeh Kian
- Student Research Committee, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Network of Interdisciplinarity in Neonates and Infants (NINI), Universal Scientific Education and Research Network (USERN), Tehran, Iran.,USERN Office, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Noosha Samieefar
- Student Research Committee, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Network of Interdisciplinarity in Neonates and Infants (NINI), Universal Scientific Education and Research Network (USERN), Tehran, Iran.,USERN Office, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nima Rezaei
- Network of Interdisciplinarity in Neonates and Infants (NINI), Universal Scientific Education and Research Network (USERN), Tehran, Iran. .,Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran.
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12
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Yuchi W, Brauer M, Czekajlo A, Davies HW, Davis Z, Guhn M, Jarvis I, Jerrett M, Nesbitt L, Oberlander TF, Sbihi H, Su J, van den Bosch M. Neighborhood environmental exposures and incidence of attention deficit/hyperactivity disorder: A population-based cohort study. ENVIRONMENT INTERNATIONAL 2022; 161:107120. [PMID: 35144157 DOI: 10.1016/j.envint.2022.107120] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 01/23/2022] [Accepted: 01/26/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Emerging studies have associated low greenspace and high air pollution exposure with risk of child attention deficit/hyperactivity disorder (ADHD). Population-based studies are limited, however, and joint effects are rarely evaluated. We investigated associations of ADHD incidence with greenspace, air pollution, and noise in a population-based birth cohort. METHODS We assembled a cohort from administrative data of births from 2000 to 2001 (N ∼ 37,000) in Metro Vancouver, Canada. ADHD was identified by hospital records, physician visits, and prescriptions. Cox proportional hazards models were applied to assess associations between environmental exposures and ADHD incidence adjusting for available covariates. Greenspace was estimated using vegetation percentage derived from linear spectral unmixing of Landsat imagery. Fine particulate matter (PM2.5) and nitrogen dioxide (NO2) were estimated using land use regression models; noise was estimated using a deterministic model. Exposure period was from birth until the age of three. Joint effects of greenspace and PM2.5 were analysed in two-exposure models and by categorizing values into quintiles. RESULTS During seven-year follow-up, 1217 ADHD cases were diagnosed. Greenspace was associated with lower incidence of ADHD (hazard ratio, HR: 0.90 [0.81-0.99] per interquartile range increment), while PM2.5 was associated with increased incidence (HR: 1.11 [1.06-1.17] per interquartile range increment). NO2 (HR: 1.01 [0.96, 1.07]) and noise (HR: 1.00 [0.95, 1.05]) were not associated with ADHD. There was a 50% decrease in the HR for ADHD in locations with the lowest PM2.5 and highest greenspace exposure, compared to a 62% increase in HR in locations with the highest PM2.5 and lowest greenspace exposure. Effects of PM2.5 were attenuated by greenspace in two-exposure models. CONCLUSIONS We found evidence suggesting environmental inequalities where children living in greener neighborhoods with low air pollution had substantially lower risk of ADHD compared to those with higher air pollution and lower greenspace exposure.
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Affiliation(s)
- Weiran Yuchi
- School of Population and Public Health, Faculty of Medicine, The University of British Columbia, 2206 East Mall, Vancouver, British Columbia, Canada
| | - Michael Brauer
- School of Population and Public Health, Faculty of Medicine, The University of British Columbia, 2206 East Mall, Vancouver, British Columbia, Canada
| | - Agatha Czekajlo
- Department of Forest Resource Management, Faculty of Forestry, The University of British Columbia, 2424 Main Mall, Vancouver, Canada
| | - Hugh W Davies
- School of Population and Public Health, Faculty of Medicine, The University of British Columbia, 2206 East Mall, Vancouver, British Columbia, Canada
| | - Zoë Davis
- Department of Forest and Conservation Sciences, Faculty of Forestry, The University of British Columbia, 2424 Main Mall, Vancouver, Canada
| | - Martin Guhn
- School of Population and Public Health, Faculty of Medicine, The University of British Columbia, 2206 East Mall, Vancouver, British Columbia, Canada
| | - Ingrid Jarvis
- Department of Forest and Conservation Sciences, Faculty of Forestry, The University of British Columbia, 2424 Main Mall, Vancouver, Canada
| | - Michael Jerrett
- Fielding School of Public Health, University of California at Los Angeles, 650 Charles E. Young Drive South, Los Angeles, CA, the United States
| | - Lorien Nesbitt
- Department of Forest Resource Management, Faculty of Forestry, The University of British Columbia, 2424 Main Mall, Vancouver, Canada
| | - Tim F Oberlander
- School of Population and Public Health, Faculty of Medicine, The University of British Columbia, 2206 East Mall, Vancouver, British Columbia, Canada; Department of Pediatrics, The University of British Columbia, 4480 Oak St. Vancouver, Canada
| | - Hind Sbihi
- School of Population and Public Health, Faculty of Medicine, The University of British Columbia, 2206 East Mall, Vancouver, British Columbia, Canada; BC Centre for Disease Control, Vancouver, Canada
| | - Jason Su
- School of Public Health, University of California at Berkeley, 2121 Berkeley Way West, Berkeley, CA, the United States
| | - Matilda van den Bosch
- School of Population and Public Health, Faculty of Medicine, The University of British Columbia, 2206 East Mall, Vancouver, British Columbia, Canada; Department of Forest and Conservation Sciences, Faculty of Forestry, The University of British Columbia, 2424 Main Mall, Vancouver, Canada; ISGlobal, Parc de Recerca Biomèdica de Barcelona, Doctor Aiguader 88, 08003 Barcelona, Spain; Universitat Pompeu Fabra, Plaça de la Mercè, 10-12, 08002 Barcelona, Spain; Centro de Investigación Biomédica en Red Instituto de Salud Carlos III, Calle de Melchor Fernández Almagro, 3, 28029, Madrid, Spain.
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13
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McBride M, Appling C, Ferguson B, Gonzalez A, Schaeffer A, Zand A, Wang D, Sam A, Hart E, Tosh A, Fontcha I, Parmacek S, Beversdorf D. Effects of stimulant medication on divergent and convergent thinking tasks related to creativity in adults with attention-deficit hyperactivity disorder. Psychopharmacology (Berl) 2021; 238:3533-3541. [PMID: 34477886 DOI: 10.1007/s00213-021-05970-0] [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: 04/01/2021] [Accepted: 08/19/2021] [Indexed: 11/29/2022]
Abstract
RATIONALE Common pharmacological treatments for attention-deficit hyperactivity disorder (ADHD) are central nervous system stimulants acting as norepinephrine-dopamine reuptake inhibitors. The noradrenergic and dopaminergic systems have been shown to impact performance on tasks assessing creativity. Some previous studies suggest higher performance on creativity tasks in ADHD. Stimulant medication has been shown to differentially impact creativity in those without ADHD. However, the full range of effects of stimulant medication on creativity in those with ADHD is not known. OBJECTIVES This study examined the effects of stimulants on convergent and divergent tasks associated with creativity in adults with ADHD. METHOD Seventeen adults diagnosed with ADHD who were prescribed stimulant medication attended two counterbalanced sessions: one after taking their prescribed stimulant dose and one after the dose was withheld. Participants completed convergent problem-solving (anagrams, Compound Remote Associates) and divergent generative (letter/semantic fluency, Torrance Test for Creative Thinking (TTCT)-Verbal) tasks. RESULTS There was a significant increase in words generated on the semantic fluency task for the stimulant session. Additionally, significant increases were found in the stimulant session for originality, flexibility, and fluency scores on the TTCT. Stimulant medication did not have an effect on any of the problem-solving tasks. CONCLUSIONS Stimulant medication enhanced verbal fluency in adults with ADHD but had no effect on convergent abilities. Furthermore, stimulants enhanced fluency, flexibility, and originality scores on the TTCT. Therefore, stimulants appear to have positive effects on divergent task performance in adults with ADHD, but not convergent tasks. This finding warrants further studies into the specific roles of norepinephrine and dopamine in this effect.
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Affiliation(s)
- Molly McBride
- School of Medicine, University of Missouri, Columbia, MO, USA
| | - Carrina Appling
- University of Missouri Interdisciplinary Neuroscience Program, Columbia, MO, USA
| | - Bradley Ferguson
- University of Missouri Interdisciplinary Neuroscience Program, Columbia, MO, USA.,Thompson Center for Autism & Neurodevelopmental Disorders, University of Missouri, Columbia, MO, USA.,Department of Health Psychology, University of Missouri, Columbia, MO, USA
| | | | | | - Amanda Zand
- School of Medicine, University of Missouri, Columbia, MO, USA
| | - David Wang
- School of Medicine, Emory University, Atlanta, GA, USA
| | - Alinna Sam
- School of Medicine, University of Missouri, Columbia, MO, USA
| | - Eric Hart
- Department of Health Psychology, University of Missouri, Columbia, MO, USA
| | - Aneesh Tosh
- Department of Child Health, University of Missouri, Columbia, MO, USA
| | - Ivan Fontcha
- Department of Biological Sciences, University of Missouri, Columbia, MO, USA
| | - Sophia Parmacek
- Department of Psychological Sciences, University of Missouri, Columbia, MO, USA
| | - David Beversdorf
- School of Medicine, University of Missouri, Columbia, MO, USA. .,University of Missouri Interdisciplinary Neuroscience Program, Columbia, MO, USA. .,Thompson Center for Autism & Neurodevelopmental Disorders, University of Missouri, Columbia, MO, USA. .,Department of Health Psychology, University of Missouri, Columbia, MO, USA. .,Departments of Radiology, Neurology, and Psychological Sciences, University of Missouri, Columbia, USA.
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14
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Vuong AM, Webster GM, Yolton K, Calafat AM, Muckle G, Lanphear BP, Chen A. Prenatal exposure to per- and polyfluoroalkyl substances (PFAS) and neurobehavior in US children through 8 years of age: The HOME study. ENVIRONMENTAL RESEARCH 2021; 195:110825. [PMID: 33545124 PMCID: PMC7987860 DOI: 10.1016/j.envres.2021.110825] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 01/19/2021] [Accepted: 01/28/2021] [Indexed: 05/25/2023]
Abstract
BACKGROUND Studies of prenatal per- and polyfluoroalkyl substances (PFAS) and attention deficit hyperactivity disorder (ADHD)-related behaviors in children are inconsistent. OBJECTIVES To examine associations between maternal serum PFAS concentrations and child behavior in 241 mother-child dyads within the Health Outcomes and Measures of the Environment (HOME) Study. METHODS We quantified perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS), perfluorohexane sulfonate (PFHxS), and perfluorononanoate (PFNA) in maternal serum collected during pregnancy or at delivery. We evaluated a total of 17 outcomes of child behavior using the Behavioral Assessment System for Children-2 (BASC-2) at 5 and 8 years (n = 240) and ADHD diagnostic symptoms and criteria with the Diagnostic Interview Schedule for Children-Young Child (DISC-YC) at 5 years (n = 190). We used linear mixed models and logistic regression with generalized estimating equations to assess associations between PFAS and continuous or dichotomous "at risk" BASC-2 scores; negative binomial regression to calculate incident rate ratios for counts of ADHD symptoms; and Poisson regression with robust standard errors to calculate relative risks of meeting ADHD diagnostic criteria. RESULTS Each ln-unit increase in PFOS, PFHxS, and PFNA was associated with higher BASC-2 scores and increased odds of "at-risk" scores for externalizing behaviors, including hyperactivity (PFOS: odds ratio [OR] 2.7, 95% confidence interval [CI] 1.2, 5.9; PFHxS: OR 2.5, 95% CI 1.5, 4.3; PFNA: OR 3.2, 95% CI 1.3, 8.0). PFHxS was also associated with internalizing problems (OR 2.0, 95% CI 1.1, 3.4) and somatization (OR 2.2, 95% CI 1.2, 4.0). PFOS and PFNA were significantly associated with 50-80% more DISC-YC symptoms and diagnostic criteria related to hyperactive-impulsive type ADHD. Prenatal PFNA was associated with increased risk of any-type ADHD. CONCLUSIONS Prenatal PFOS and PFNA were consistently associated with measures related to hyperactive-impulsive type ADHD across two validated assessment instruments. PFHxS was associated with increased problems with both externalizing and internalizing behaviors. No associations were noted between PFOA and child neurobehavior.
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Affiliation(s)
- Ann M Vuong
- Department of Epidemiology and Biostatistics, School of Public Health, University of Nevada, Las Vegas, Las Vegas, NV, USA.
| | - Glenys M Webster
- BC Children's Hospital Research Institute and Faculty of Health Sciences, Simon Fraser University, Vancouver, British Columbia, Canada
| | - Kimberly Yolton
- Division of General and Community Pediatrics, Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Antonia M Calafat
- Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Gina Muckle
- School of Psychology, Laval University, Québec, Québec, Canada
| | - Bruce P Lanphear
- BC Children's Hospital Research Institute and Faculty of Health Sciences, Simon Fraser University, Vancouver, British Columbia, Canada
| | - Aimin Chen
- Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
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15
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Xie Y, Gao X, Song Y, Zhu X, Chen M, Yang L, Ren Y. Effectiveness of Physical Activity Intervention on ADHD Symptoms: A Systematic Review and Meta-Analysis. Front Psychiatry 2021; 12:706625. [PMID: 34764893 PMCID: PMC8575983 DOI: 10.3389/fpsyt.2021.706625] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 09/13/2021] [Indexed: 01/27/2023] Open
Abstract
Objective: To assess the effectiveness of physical activity (PA) intervention on attention-deficit/hyperactivity disorder (ADHD)-related symptoms. Method: Studies that investigated PA intervention for ADHD-related symptoms were identified through searching PubMed, Web of Science, Cochrane Library, and Embase databases from inception through June 2021. Standardized mean difference (SMD) with 95% confidence interval (CI) was used to assess the effectiveness of PA intervention on improving ADHD-related symptoms. The meta-analyses were conducted using fixed-effect or random-effect models according to the heterogeneity of the studies. Results: Nine before-after studies (232 participants) and 14 two-group control studies (162 participants/141 controls) were included in this meta-analysis. Combined results for before-after studies indicated significant improvements on all studied ADHD-related symptoms (inattention: SMD = 0.604, 95% CI: 0.374-0.834, p < 0.001; hyperactivity/impulsivity: SMD = 0.676, 95% CI: 0.401-0.950, p < 0.001; emotional problems: SMD = 0.416, 95% CI: 0.283-0.549, p < 0.001; behavioral problems: SMD = 0.347, 95% CI: 0.202-0.492, p < 0.001). Meta-analyses for two-group control studies further confirmed that PA intervention significantly improved the inattentive symptom (SMD = 0.715, 95% CI: 0.105, 1.325, p = 0.022). Subgroup analyses suggested significant beneficial effect on inattention symptoms in children. Moreover, closed motor skills were beneficial for hyperactive/impulsive problems (SMD = 0.671, p < 0.001), while open motor skills were beneficial for attention problems (SMD = 0.455, p = 0.049). When excluding studies with combined medication, the studies in unmedicated participants in before-after studies still showed significant results in all studied ADHD-related symptoms as in the overall analysis. Given the limited sample size, the best frequency and intensity of PA intervention need further investigation. Conclusion: Our results suggested that PA intervention could possibly improve ADHD-related symptoms, especially inattention symptoms. Closed-skill and open-skill activities could be beneficial for hyperactivity/impulsivity and inattention symptoms, respectively. Further high-quality randomized clinical trials with large sample size are needed.
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Affiliation(s)
- Yongtao Xie
- College of Physical Education and Sports, Beijing Normal University, Beijing, China.,Department of Human Movement Science, Hebei Sports University, Shijiazhuang, China
| | - Xuping Gao
- Department of Child & Adolescent Psychiatry, National Clinical Research Center for Mental Disorders and NHC Key Laboratory of Mental Health (Peking University Sixth Hospital), Peking University Sixth Hospital (Institute of Mental Health), Beijing, China
| | - Yiling Song
- College of Physical Education and Sports, Beijing Normal University, Beijing, China
| | - Xiaotong Zhu
- College of Physical Education and Sports, Beijing Normal University, Beijing, China
| | - Mengge Chen
- College of Physical Education and Sports, Beijing Normal University, Beijing, China
| | - Li Yang
- Department of Child & Adolescent Psychiatry, National Clinical Research Center for Mental Disorders and NHC Key Laboratory of Mental Health (Peking University Sixth Hospital), Peking University Sixth Hospital (Institute of Mental Health), Beijing, China
| | - Yuanchun Ren
- College of Physical Education and Sports, Beijing Normal University, Beijing, China
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16
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Baumann V, Birnbaum T, Breitling-Ziegler C, Tegelbeckers J, Dambacher J, Edelmann E, Bergado-Acosta JR, Flechtner HH, Krauel K. Exploration of a novel virtual environment improves memory consolidation in ADHD. Sci Rep 2020; 10:21453. [PMID: 33293595 PMCID: PMC7722922 DOI: 10.1038/s41598-020-78222-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 11/19/2020] [Indexed: 01/09/2023] Open
Abstract
Experimental evidence in rodents and humans suggests that long-term memory consolidation can be enhanced by the exploration of a novel environment presented during a vulnerable early phase of consolidation. This memory enhancing effect (behavioral tagging) is caused by dopaminergic and noradrenergic neuromodulation of hippocampal plasticity processes. In translation from animal to human research, we investigated whether behavioral tagging with novelty can be used to tackle memory problems observed in children and adolescents with attention-deficit/hyperactivity disorder (ADHD). 34 patients with ADHD and 34 typically developing participants (age 9–15 years) explored either a previously familiarized or a novel virtual environment 45 min after they had learned a list of 20 words. Participants took a free recall test both immediately after learning the word list and after 24 h. Patients who explored a familiar environment showed significantly impaired memory consolidation compared to typically developing peers. Exploration of a novel environment led to significantly better memory consolidation in children and adolescents with ADHD. However, we did not observe a beneficial effect of novel environment exploration in typically developing participants. Our data rather suggested that increased exploration of a novel environment as well as higher feelings of virtual immersion compromised memory performance in typically developing children and adolescents, which was not the case for patients with ADHD. We propose that behavioral tagging with novel virtual environments is a promising candidate to overcome ADHD related memory problems. Moreover, the discrepancy between children and adolescents with and without ADHD suggests that behavioral tagging might only be able to improve memory consolidation for weakly encoded information.
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Affiliation(s)
- Valentin Baumann
- Department of Child and Adolescent Psychiatry and Psychotherapy, University of Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany.
| | - Thomas Birnbaum
- Department of Child and Adolescent Psychiatry and Psychotherapy, University of Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Carolin Breitling-Ziegler
- Department of Child and Adolescent Psychiatry and Psychotherapy, University of Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Jana Tegelbeckers
- Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Johannes Dambacher
- Department of Child and Adolescent Psychiatry and Psychotherapy, University of Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany.,Faculty of Computer Science, University of Magdeburg, Magdeburg, Germany
| | - Elke Edelmann
- Department of Physiology, University of Kiel, Kiel, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
| | - Jorge R Bergado-Acosta
- Department of Pharmacology and Toxicology, University of Magdeburg, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
| | - Hans-Henning Flechtner
- Department of Child and Adolescent Psychiatry and Psychotherapy, University of Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany
| | - Kerstin Krauel
- Department of Child and Adolescent Psychiatry and Psychotherapy, University of Magdeburg, Leipziger Straße 44, 39120, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
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17
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Corona JC. Role of Oxidative Stress and Neuroinflammation in Attention-Deficit/Hyperactivity Disorder. Antioxidants (Basel) 2020; 9:antiox9111039. [PMID: 33114154 PMCID: PMC7690797 DOI: 10.3390/antiox9111039] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/03/2020] [Accepted: 09/08/2020] [Indexed: 02/06/2023] Open
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder of childhood. Although abnormalities in several brain regions and disturbances of the catecholaminergic pathway have been demonstrated, the pathophysiology of ADHD is not completely understood, but as a multifactorial disorder, has been associated with an increase in oxidative stress and neuroinflammation. This review presents an overview of factors that increase oxidative stress and neuroinflammation. The imbalance between oxidants and antioxidants and also the treatment with medications are two factors that can increase oxidative damage, whereas the comorbidity between ADHD and inflammatory disorders, altered immune response, genetic and environmental associations, and polymorphisms in inflammatory-related genes can increase neuroinflammation. Evidence of an association with these factors has become valuable for research on ADHD. Such evidence opens up new intervention routes for the use of natural products as antioxidants that could have potential as a treatment against oxidative stress and neuroinflammation in ADHD.
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Affiliation(s)
- Juan Carlos Corona
- Laboratory of Neurosciences, Hospital Infantil de México Federico Gómez, Mexico City 06720, Mexico
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18
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Bioulac S, Sagaspe P, Micoulaud-Franchi JA, Altena E, Taillard J, Schröder C, Bouvard MP, Fabrigoule C, Philip P. Objective Level of Alertness and Inhibitory Control Predict Highway Driving Impairment in Adults With ADHD. J Atten Disord 2020; 24:1475-1486. [PMID: 27009924 DOI: 10.1177/1087054716633751] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Objective: It remains unclear whether daytime impairments in ADHD patients are better explained by an altered level of alertness and/or by cognitive deficits. The aim of this study was to determine the respective contribution of these factors on driving performance in ADHD adults. Method: ADHD adults (n = 39) and healthy controls (n = 18) underwent a nocturnal polysomnography (PSG) followed by a Maintenance of Wakefulness Test (MWT), a simulated driving task, and a neuropsychological evaluation. Results: ADHD patients had shorter mean sleep latency on the MWT and worse driving performance than controls. They also made more errors on attention and executive functioning tests. Logistic regression analyses showed that inhibition deficits and objective daytime sleepiness predicted highway driving performance in ADHD. Conclusion: Our study shows that not only inhibitory control deficits but also pathological level of alertness independently contribute to highway driving impairment in ADHD patients, providing a better understanding of the pathophysiological mechanisms involved in ADHD.
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Affiliation(s)
- Stéphanie Bioulac
- Pôle Universitaire Psychiatrie Enfants et Adolescents, Bordeaux, France.,Université de Bordeaux, France.,Unité de Service et de Recherche du Centre National de la Recherche Scientifique 3413 (USR CNRS 3413), Sommeil, Attention et Neuropsychiatrie (SANPSY), Bordeaux, France
| | - Patricia Sagaspe
- Université de Bordeaux, France.,Unité de Service et de Recherche du Centre National de la Recherche Scientifique 3413 (USR CNRS 3413), Sommeil, Attention et Neuropsychiatrie (SANPSY), Bordeaux, France.,Centre Hospitalier Universitaire (CHU) Pellegrin, Clinique du Sommeil, Bordeaux, France
| | - Jean-Arthur Micoulaud-Franchi
- Université de Bordeaux, France.,Unité de Service et de Recherche du Centre National de la Recherche Scientifique 3413 (USR CNRS 3413), Sommeil, Attention et Neuropsychiatrie (SANPSY), Bordeaux, France.,Centre Hospitalier Universitaire (CHU) Pellegrin, Clinique du Sommeil, Bordeaux, France
| | - Ellemarije Altena
- Université de Bordeaux, France.,Unité de Service et de Recherche du Centre National de la Recherche Scientifique 3413 (USR CNRS 3413), Sommeil, Attention et Neuropsychiatrie (SANPSY), Bordeaux, France
| | - Jacques Taillard
- Université de Bordeaux, France.,Unité de Service et de Recherche du Centre National de la Recherche Scientifique 3413 (USR CNRS 3413), Sommeil, Attention et Neuropsychiatrie (SANPSY), Bordeaux, France.,Centre Hospitalier Universitaire (CHU) Pellegrin, Clinique du Sommeil, Bordeaux, France
| | - Carmen Schröder
- University of Strasbourg, France.,Institute for Cellular and Integrative Neuroscience, Strasbourg, France
| | | | - Colette Fabrigoule
- Université de Bordeaux, France.,Unité de Service et de Recherche du Centre National de la Recherche Scientifique 3413 (USR CNRS 3413), Sommeil, Attention et Neuropsychiatrie (SANPSY), Bordeaux, France
| | - Pierre Philip
- Université de Bordeaux, France.,Unité de Service et de Recherche du Centre National de la Recherche Scientifique 3413 (USR CNRS 3413), Sommeil, Attention et Neuropsychiatrie (SANPSY), Bordeaux, France.,Centre Hospitalier Universitaire (CHU) Pellegrin, Clinique du Sommeil, Bordeaux, France
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19
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Mocanu V, Tavakoli I, MacDonald A, Dang JT, Switzer N, Birch DW, Karmali S. The Impact of ADHD on Outcomes Following Bariatric Surgery: a Systematic Review and Meta-analysis. Obes Surg 2020; 29:1403-1409. [PMID: 30706311 DOI: 10.1007/s11695-019-03735-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The objective our study was to carry out a systematic review and meta-analysis to examine the impact of attention-deficit and hyperactivity disorder (ADHD) on bariatric surgery outcomes. Despite the effectiveness of bariatric surgery, about 10 to 20% of patients continue to regain weight after the procedure. New evidence supports that ADHD may be directly associated with obesity and may affect outcomes following bariatric surgery. However, certain psychiatric illnesses, such as ADHD, are rarely screened for, leading to a continued lack of data on the interaction between ADHD and bariatric surgery. A comprehensive literature search for both published and unpublished studies of ADHD and bariatric surgery from 1946 to August 2018 was performed. The search was conducted using the Medline, EMBASE, Scopus, the Cochrane Library, and Web of Science databases as well as conference abstracts. Our search strategy terms included "(ADHD OR attention deficit hyperactivity disorder) AND (bariatrics OR obesity surgery OR gastric bypass OR gastric sleeve OR Roux-en-Y OR RYGB OR sleeve gastrectomy)" and was limited to human studies in the English language. Preliminary database search of the literature yielded 104 articles after 70 duplicates were removed. A total of five studies with 492 patients were included. The overall ADHD rate was 20.9% with reported rates ranging from 7 to 38%. The weighted mean age was 44.0 ± 10.2 years, the weighted sex was 83.6% female, and the weighted mean follow-up was 22.2 months. Preoperative weighted mean BMI was 43.7 versus a postoperative weighted mean BMI of 34.7. No statistical significance was observed for mean BMI difference between non-ADHD vs. ADHD patients undergoing bariatric surgery (three studies; MD - 2.66; CI - 7.54 to 2.13; p = 0.28). Statistical significance was, however, observed for postoperative follow-up between patients with ADHD vs. non-ADHD subjects (three studies; MD - 7.28; - 13.83 to -0.73; p = 0.03). Patients with ADHD do not have a statistically significant mean BMI difference following bariatric surgery but have a statistically significant reduction in postoperative follow-up versus non-ADHD patients. Targeted strategies aimed at improving clinic attendance for this at-risk ADHD population may improve bariatric outcomes and minimize recidivism rates.
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Affiliation(s)
- Valentin Mocanu
- Department of Surgery, University of Alberta Hospital, 8440 112 Street NW, Edmonton, AB, T6G 2B7, Canada.
| | - Iran Tavakoli
- Department of Surgery, University of Alberta Hospital, 8440 112 Street NW, Edmonton, AB, T6G 2B7, Canada
| | - Andrew MacDonald
- Department of Surgery, University of Alberta Hospital, 8440 112 Street NW, Edmonton, AB, T6G 2B7, Canada
| | - Jerry T Dang
- Department of Surgery, University of Alberta Hospital, 8440 112 Street NW, Edmonton, AB, T6G 2B7, Canada
| | - Noah Switzer
- Department of Surgery, University of Alberta Hospital, 8440 112 Street NW, Edmonton, AB, T6G 2B7, Canada
| | - Daniel W Birch
- Centre for the Advancement of Minimally Invasive Surgery (CAMIS), Royal Alexandra Hospital, Edmonton, Alberta, Canada
| | - Shahzeer Karmali
- Centre for the Advancement of Minimally Invasive Surgery (CAMIS), Royal Alexandra Hospital, Edmonton, Alberta, Canada
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20
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Keute M, Stenner MP, Mueller MK, Zaehle T, Krauel K. Error-Related Dynamics of Reaction Time and Frontal Midline Theta Activity in Attention Deficit Hyperactivity Disorder (ADHD) During a Subliminal Motor Priming Task. Front Hum Neurosci 2019; 13:381. [PMID: 31736729 PMCID: PMC6828612 DOI: 10.3389/fnhum.2019.00381] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 10/14/2019] [Indexed: 12/11/2022] Open
Abstract
Post-error slowing (PES) is an established performance monitoring readout. Several previous studies have found that PES is reduced in children and adolescents with attention-deficit hyperactivity disorder (ADHD). We analyzed reaction time data, along with electroencephalography (EEG) data, from a response priming experiment in children and adolescents with ADHD (N = 28) and typically developing (TD) controls (N = 15) between 10 and 17 years of age. We report dynamic reaction time changes before and after errors: whereas TD controls readjusted their response speed to their individual average speed after committing an error, this reaction time adjustment appeared to be delayed and decreased in ADHD patients. In the EEG, error trials were accompanied by increased frontal midline theta activity, which was attenuated in ADHD compared to TD. We conclude that PES has a different time course rather than being fully absent in ADHD and discuss relationships with our EEG findings and potential implications for performance monitoring in ADHD.
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Affiliation(s)
- Marius Keute
- Department of Neurology, Otto-von-Guericke-University, Magdeburg, Germany.,Department of Child and Adolescent Psychiatry and Psychotherapy, Otto-von-Guericke-University, Magdeburg, Germany
| | - Max-Philipp Stenner
- Department of Neurology, Otto-von-Guericke-University, Magdeburg, Germany.,Department of Behavioral Neurology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | | | - Tino Zaehle
- Department of Neurology, Otto-von-Guericke-University, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
| | - Kerstin Krauel
- Department of Child and Adolescent Psychiatry and Psychotherapy, Otto-von-Guericke-University, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
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21
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Letourneau NL, de Koning APJ, Sekhon B, Ntanda HN, Kobor M, Deane AJ, Morin AM, Dewey D, Campbell TS, Giesbrecht GF. Parenting Interacts With Plasticity Genes in Predicting Behavioral Outcomes in Preschoolers. Can J Nurs Res 2019; 52:290-307. [PMID: 31403319 DOI: 10.1177/0844562119863612] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Public health and pediatric nurses typically focus on supporting parenting to reduce the likelihood of children's behavioral problems. Studies have identified interactions between early exposures to stress in caregiving and child genotype in predicting children's behavioral problems, such that certain genotypes connote greater differential susceptibility or plasticity to environmental stressors. We sought to uncover the interaction between observational measures of parent-child relationship quality and genotype in predicting early-onset behavioral problems in 24-month-olds, using prospective methods. METHODS We conducted a secondary analysis of data collected on a subsample of 176 women and their infants enrolled during pregnancy in the ongoing Alberta Pregnancy Outcomes and Nutrition (APrON) cohort study. Inclusion criteria required mothers to be ≥18 years of age, English speaking and ≤22 weeks gestational age at enrollment. Genetic data were obtained from blood leukocytes and buccal epithelial cell samples, collected from infants at three months of age. For each child, the presence of plasticity alleles was determined for BDNF, CNR1, DRD2/ANKK1, DRD4, DAT1, 5-HTTLPR, and MAOA and an overall index was calculated to summarize the number of plasticity alleles present. Observational assessments of parent-child relationship quality (sensitivity, controlling, and unresponsiveness) were conducted at six months of age. Children's internalizing (e.g., emotionally reactive, anxious/depressed, somatic complaint, withdrawn) and externalizing (e.g., aggression, inattention) behaviors were assessed at 24 months of age. After extracting genetic data, a maximum likelihood method for regressions was employed with Akaike Information Criterion (AIC) for model selection. RESULTS When parents were less responsive and children possessed more plasticity alleles, children were more likely to be emotionally reactive, anxious/depressed, report somatic complaints, and withdrawn, while when parents were less responsive and children possessed fewer plasticity alleles, children were less likely to display these internalizing behaviors, in a differentially susceptible manner. Furthermore, when parents were more responsive, and children possessed more plasticity alleles, children were less likely to display internalizing behaviors (P = 0.034). Similarly, children who possessed either the CNR1-A plasticity allele (P = 0.010) or DAT1 9-repeat plasticity allele (P = 0.036) and experienced more/less parental control displayed more/fewer externalizing problems, respectively, in a differentially susceptible manner. CONCLUSIONS The plasticity index score interacted with parental unresponsiveness in predicting anxiety and depressive behavioral problems in children, while individual genetic variants interacted with parental controlling behavior in predicting aggression and inattention in children, suggestive of differential susceptibility to caregiving. Especially in the context of nursing interventions designed to support childrearing and children's development, nurses need to be aware of the interactions between child genotype and parenting in understanding how well interventions will work in promoting optimal child behavior.
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Affiliation(s)
- Nicole L Letourneau
- Faculty of Nursing, University of Calgary, Canada.,Department of Pediatrics, Cumming School of Medicine, University of Calgary, Canada.,Departments of Psychiatry and Community Health Sciences, Cumming School of Medicine, University of Calgary, Canada
| | | | | | - Henry N Ntanda
- Department of Pediatrics, Cumming School of Medicine, University of Calgary, Canada
| | - Michael Kobor
- Department of Medical Genetics, Centre for Molecular Medicine and Therapeutics, University of British Columbia, Canada
| | - Andrea J Deane
- Department of Pediatrics, Cumming School of Medicine, University of Calgary, Canada
| | - Alexander M Morin
- Department of Medical Genetics, Centre for Molecular Medicine and Therapeutics, University of British Columbia, Canada
| | - Deborah Dewey
- Department of Pediatrics, Cumming School of Medicine, University of Calgary, Canada
| | | | - Gerald F Giesbrecht
- Department of Pediatrics, Cumming School of Medicine, University of Calgary, Canada
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22
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Moreno-Salinas AL, Avila-Zozaya M, Ugalde-Silva P, Hernández-Guzmán DA, Missirlis F, Boucard AA. Latrophilins: A Neuro-Centric View of an Evolutionary Conserved Adhesion G Protein-Coupled Receptor Subfamily. Front Neurosci 2019; 13:700. [PMID: 31354411 PMCID: PMC6629964 DOI: 10.3389/fnins.2019.00700] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 06/20/2019] [Indexed: 12/21/2022] Open
Abstract
The adhesion G protein-coupled receptors latrophilins have been in the limelight for more than 20 years since their discovery as calcium-independent receptors for α-latrotoxin, a spider venom toxin with potent activity directed at neurotransmitter release from a variety of synapse types. Latrophilins are highly expressed in the nervous system. Although a substantial amount of studies has been conducted to describe the role of latrophilins in the toxin-mediated action, the recent identification of endogenous ligands for these receptors helped confirm their function as mediators of adhesion events. Here we hypothesize a role for latrophilins in inter-neuronal contacts and the formation of neuronal networks and we review the most recent information on their role in neurons. We explore molecular, cellular and behavioral aspects related to latrophilin adhesion function in mice, zebrafish, Drosophila melanogaster and Caenorhabditis elegans, in physiological and pathophysiological conditions, including autism spectrum, bipolar, attention deficit and hyperactivity and substance use disorders.
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Affiliation(s)
- Ana L. Moreno-Salinas
- Department of Cell Biology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Monserrat Avila-Zozaya
- Department of Cell Biology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Paul Ugalde-Silva
- Department of Cell Biology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - David A. Hernández-Guzmán
- Department of Physiology, Biophysics and Neurosciences, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Fanis Missirlis
- Department of Physiology, Biophysics and Neurosciences, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Antony A. Boucard
- Department of Cell Biology, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
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23
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Association of Low Lead Levels with Behavioral Problems and Executive Function Deficits in Schoolers from Montevideo, Uruguay. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15122735. [PMID: 30518085 PMCID: PMC6313712 DOI: 10.3390/ijerph15122735] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 11/27/2018] [Accepted: 11/29/2018] [Indexed: 01/11/2023]
Abstract
The negative effect of lead exposure on children's intelligence is well-documented. Less is known about the impact of lead on the use of executive functions to self-regulate behavior. We measured blood lead level (BLL) in a sample of first grade children from Montevideo, Uruguay (n = 206, age 6.7 ± 0.5 years, 59.7% boys). Behavior was assessed with teacher versions of the Conners Rating Scale (CRS) and the Behavior Rating Inventory of Executive Functions (BRIEF). Mean BLL was 4.2 ± 2.1 μg/dL; 10% had mild-to-severe ratings of Attentional Deficit with Hyperactivity Disorder (ADHD) (T score > 65). In negative binomial regression, BLL was not associated with CRS sub-scales, but was associated with a poorer ability to inhibit inappropriate behaviors, prevalence ratio (PR) [95% CI]: 1.01 [1.00, 1.03] as measured by the BRIEF. In covariate-adjusted models, the association with BLL was attenuated. When stratified by sex, the covariate-adjusted association between BLL, hyperactivity, poorer inhitibion, emotional control, and behavioral regulation was marginally significant for girls but not boys. In summary, among children with low lead-exposure, we found some, but nonetheless modest, evidence of a relationship between higher BLL and child behavior. If confirmed by larger studies and other objective measures of behavior, such links could have implications for learning and social interaction, particularly among girls.
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24
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Myhre O, Låg M, Villanger GD, Oftedal B, Øvrevik J, Holme JA, Aase H, Paulsen RE, Bal-Price A, Dirven H. Early life exposure to air pollution particulate matter (PM) as risk factor for attention deficit/hyperactivity disorder (ADHD): Need for novel strategies for mechanisms and causalities. Toxicol Appl Pharmacol 2018; 354:196-214. [PMID: 29550511 DOI: 10.1016/j.taap.2018.03.015] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 02/14/2018] [Accepted: 03/12/2018] [Indexed: 12/11/2022]
Abstract
Epidemiological studies have demonstrated that air pollution particulate matter (PM) and adsorbed toxicants (organic compounds and trace metals) may affect child development already in utero. Recent studies have also indicated that PM may be a risk factor for neurodevelopmental disorders (NDDs). A pattern of increasing prevalence of attention deficit/hyperactivity disorder (ADHD) has been suggested to partly be linked to environmental pollutants exposure, including PM. Epidemiological studies suggest associations between pre- or postnatal exposure to air pollution components and ADHD symptoms. However, many studies are cross-sectional without possibility to reveal causality. Cohort studies are often small with poor exposure characterization, and confounded by traffic noise and socioeconomic factors, possibly overestimating the study associations. Furthermore, the mechanistic knowledge how exposure to PM during early brain development may contribute to increased risk of ADHD symptoms or cognitive deficits is limited. The closure of this knowledge gap requires the combined use of well-designed longitudinal cohort studies, supported by mechanistic in vitro studies. As ADHD has profound consequences for the children affected and their families, the identification of preventable risk factors such as air pollution exposure should be of high priority.
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Affiliation(s)
- Oddvar Myhre
- Department of Toxicology and Risk Assessment, Norwegian Institute of Public Health, Oslo, Norway.
| | - Marit Låg
- Department of Air pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway
| | - Gro D Villanger
- Department of Child Health and Development, Norwegian Institute of Public Health, Oslo, Norway
| | - Bente Oftedal
- Department of Air pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway
| | - Johan Øvrevik
- Department of Air pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway
| | - Jørn A Holme
- Department of Air pollution and Noise, Norwegian Institute of Public Health, Oslo, Norway
| | - Heidi Aase
- Department of Child Health and Development, Norwegian Institute of Public Health, Oslo, Norway
| | - Ragnhild E Paulsen
- Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, Norway
| | - Anna Bal-Price
- European Commission, Joint Research Centre, Ispra, Italy
| | - Hubert Dirven
- Department of Toxicology and Risk Assessment, Norwegian Institute of Public Health, Oslo, Norway
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25
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Bonvicini C, Faraone SV, Scassellati C. Common and specific genes and peripheral biomarkers in children and adults with attention-deficit/hyperactivity disorder. World J Biol Psychiatry 2018; 19:80-100. [PMID: 28097908 PMCID: PMC5568996 DOI: 10.1080/15622975.2017.1282175] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVES Elucidating the biological mechanisms involved in attention-deficit/hyperactivity disorder (ADHD) has been challenging. Relatively unexplored is the fact that these mechanisms can differ with age. METHODS We present an overview on the major differences between children and adults with ADHD, describing several studies from genomics to metabolomics performed in ADHD children and in adults (cADHD and aADHD, respectively). A systematic search (up until February 2016) was conducted. RESULTS From a PRISMA flow-chart, a total of 350 and 91 genomics and metabolomics studies were found to be elligible for cADHD and aADHD, respectively. For children, associations were found for genes belonging to dopaminergic (SLC6A3, DRD4 and MAOA) and neurodevelopmental (LPHN3 and DIRAS2) systems and OPRM1 (Yates corrected P = 0.016; OR = 2.27 95%CI: 1.15-4.47). Studies of adults have implicated circadian rhythms genes, HTR2A, MAOB and a more generic neurodevelopmental/neurite outgrowth network (BCHE, SNAP25, BAIAP2, NOS1/NO, KCNIP4 and SPOCK3; Yates corrected P = 0.007; OR = 3.30 95%CI: 1.33-8.29). In common among cADHD and aADHD, the most significant findings are for oxidative stress proteins (MAD, SOD, PON1, ARES, TOS, TAS and OSI), and, in the second level, DISC1, DBH, DDC, microRNA and adiponectin. CONCLUSIONS Through a convergent functional genomics, this review contributes to clarification of which genetic/biological mechanisms differ with age. The effects of some genes do not change throughout the lifetime, whereas others are linked to age-specific stages. Additional research and further studies are needed to generate firmer conclusions that might someday be useful for predicting the remission and persistence of the disorder. Despite the limitations, some of these genes/proteins could be potential useful biomarkers to discriminate cADHD from aADHD.
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Affiliation(s)
- Cristian Bonvicini
- Genetics Unit, IRCCS “Centro S. Giovanni di Dio” Fatebenefratelli, Brescia, Italy
| | - Stephen V. Faraone
- Departments of Psychiatry and of Neuroscience and Physiology, SUNY Upstate Medical University, Syracuse, NY, USA; K.G. Jebsen Centre for Research on Neuropsychiatric Disorders, Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Catia Scassellati
- Genetics Unit, IRCCS “Centro S. Giovanni di Dio” Fatebenefratelli, Brescia, Italy
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26
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Salatino-Oliveira A, Rohde LA, Hutz MH. The dopamine transporter role in psychiatric phenotypes. Am J Med Genet B Neuropsychiatr Genet 2018; 177:211-231. [PMID: 28766921 DOI: 10.1002/ajmg.b.32578] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 06/26/2017] [Accepted: 07/18/2017] [Indexed: 01/06/2023]
Abstract
The dopamine transporter (DAT) is one of the most relevant and investigated neurotransmitter transporters. DAT is a plasma membrane protein which plays a homeostatic role, controlling both extracellular and intracellular concentrations of dopamine (DA). Since unbalanced DA levels are known to be involved in numerous mental disorders, a wealth of investigations has provided valuable insights concerning DAT role into normal brain functioning and pathological processes. Briefly, this extensive but non-systematic review discusses what is recently known about the role of SLC6A3 gene which encodes the dopamine transporter in psychiatric phenotypes. DAT protein, SLC6A3 gene, animal models, neuropsychology, and neuroimaging investigations are also concisely discussed. To conclude, current challenges are reviewed in order to provide perspectives for future studies.
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Affiliation(s)
| | - Luis A Rohde
- Division of Child and Adolescent Psychiatry, Hospital de Clinicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Institute for Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil
| | - Mara H Hutz
- Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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27
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Marinho V, Oliveira T, Rocha K, Ribeiro J, Magalhães F, Bento T, Pinto GR, Velasques B, Ribeiro P, Di Giorgio L, Orsini M, Gupta DS, Bittencourt J, Bastos VH, Teixeira S. The dopaminergic system dynamic in the time perception: a review of the evidence. Int J Neurosci 2017; 128:262-282. [PMID: 28950734 DOI: 10.1080/00207454.2017.1385614] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Dopaminergic system plays a key role in perception, which is an important executive function of the brain. Modulation in dopaminergic system forms an important biochemical underpinning of neural mechanisms of time perception in a very wide range, from milliseconds to seconds to longer daily rhythms. Distinct types of temporal experience are poorly understood, and the relationship between processing of different intervals by the brain has received little attention. A comprehensive understanding of interval timing functions should be sought within a wider context of temporal processing, involving genetic aspects, pharmacological models, cognitive aspects, motor control and the neurological diseases with impaired dopaminergic system. Particularly, an unexplored question is whether the role of dopamine in interval timing can be integrated with the role of dopamine in non-interval timing temporal components. In this review, we explore a wider perspective of dopaminergic system, involving genetic polymorphisms, pharmacological models, executive functions and neurological diseases on the time perception. We conclude that the dopaminergic system has great participation in impact on time perception and neurobiological basis of the executive functions and neurological diseases.
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Affiliation(s)
- Victor Marinho
- a Brain Mapping and Plasticity Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil.,b Genetics and Molecular Biology Laboratory, Federal University of Piauí , Parnaíba , Brazil
| | - Thomaz Oliveira
- a Brain Mapping and Plasticity Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil.,b Genetics and Molecular Biology Laboratory, Federal University of Piauí , Parnaíba , Brazil
| | - Kaline Rocha
- a Brain Mapping and Plasticity Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil
| | - Jéssica Ribeiro
- a Brain Mapping and Plasticity Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil
| | - Francisco Magalhães
- a Brain Mapping and Plasticity Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil
| | - Thalys Bento
- a Brain Mapping and Plasticity Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil
| | - Giovanny R Pinto
- b Genetics and Molecular Biology Laboratory, Federal University of Piauí , Parnaíba , Brazil
| | - Bruna Velasques
- c Brain Mapping and Sensory Motor Integration Laboratory, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ) , Rio de Janeiro , Brazil
| | - Pedro Ribeiro
- c Brain Mapping and Sensory Motor Integration Laboratory, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ) , Rio de Janeiro , Brazil
| | - Luiza Di Giorgio
- c Brain Mapping and Sensory Motor Integration Laboratory, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ) , Rio de Janeiro , Brazil
| | - Marco Orsini
- c Brain Mapping and Sensory Motor Integration Laboratory, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ) , Rio de Janeiro , Brazil.,d Rehabilitation Science Program, Analysis of Human Movement Laboratory, Augusto Motta University Center (UNISUAM) , Rio de Janeiro , Brazil
| | - Daya S Gupta
- e Department of Biology , Camden County College , Blackwood , NJ , USA
| | - Juliana Bittencourt
- f Biomedical Engineering Program (COPPE), Federal University of Rio de Janeiro (UFRJ) , Rio de Janeiro , Brazil
| | - Victor Hugo Bastos
- g Brain Mapping and Functionality Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil
| | - Silmar Teixeira
- a Brain Mapping and Plasticity Laboratory, Federal University of Piauí (UFPI) , Parnaíba , Brazil
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28
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Further replication of the synergistic interaction between LPHN3 and the NTAD gene cluster on ADHD and its clinical course throughout adulthood. Prog Neuropsychopharmacol Biol Psychiatry 2017. [PMID: 28624582 DOI: 10.1016/j.pnpbp.2017.06.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Attention-Deficit/Hyperactivity Disorder (ADHD) is a common and highly heritable neuropsychiatric disorder. Despite the high heritability, the unraveling of specific genetic factors related to ADHD is hampered by its considerable genetic complexity. Recent evidence suggests that gene-gene interactions can explain part of this complexity. We examined the impact of strongly supported interaction effects between the LPHN3 gene and the NTAD gene cluster (NCAM1-TTC12-ANKK1-DRD2) in a 7-year follow-up of a clinical sample of adults with ADHD, addressing associations with susceptibility, symptomatology and stability of diagnosis. The sample comprises 548 adults with ADHD and 643 controls. Entropy-based analysis indicated a potential interaction between the LPHN3-rs6551665 and TTC12-rs2303380 SNPs influencing ADHD symptom counts. Further analyses revealed significant interaction effects on ADHD total symptoms (p=0.002), and with hyperactivity/impulsivity symptom counts (p=0.005). In the group composed by predominantly hyperactive/impulsive and combined presentation, the presence of LPHN3-rs6551665 G allele was related to increased ADHD risk only in individuals carrying the TTC12-rs2303380 AA genotype (p=0.026). Also, the same allelic constellation is involved in maintenance of ADHD in a predominantly hyperactive/impulsive or combined presentation after a 7-year follow-up (p=0.008). These observations reinforce and replicate previous evidence suggesting that an interaction effect between the LPHN3 gene and the NTAD cluster may have a role in the genetic substrate associated to ADHD also in adults. Moreover, it is possible that the interactions between LPHN3 and NTAD are specific factors contributing to the development of an ADHD phenotype with increased hyperactivity/impulsivity that is maintained throughout adulthood.
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29
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Giertuga K, Zakrzewska MZ, Bielecki M, Racicka-Pawlukiewicz E, Kossut M, Cybulska-Klosowicz A. Age-Related Changes in Resting-State EEG Activity in Attention Deficit/Hyperactivity Disorder: A Cross-Sectional Study. Front Hum Neurosci 2017; 11:285. [PMID: 28620288 PMCID: PMC5451878 DOI: 10.3389/fnhum.2017.00285] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 05/16/2017] [Indexed: 12/03/2022] Open
Abstract
Numerous studies indicate that attention deficit/hyperactivity disorder (ADHD) is related to some developmental trends, as its symptoms change widely over time. Nevertheless, the etiology of this phenomenon remains ambiguous. There is a disagreement whether ADHD is related to deviations in brain development or to a delay in brain maturation. The model of deviated brain development suggests that the ADHD brain matures in a fundamentally different way, and does not reach normal maturity at any developmental stage. On the contrary, the delayed brain maturation model assumes that the ADHD brain indeed matures in a different, delayed way in comparison to healthy age-matched controls, yet eventually reaches proper maturation. We investigated age-related changes in resting-state EEG activity to find evidence to support one of the alternative models. A total of 141 children and teenagers participated in the study; 67 diagnosed with ADHD and 74 healthy controls. The absolute power of delta, theta, alpha, and beta frequency bands was analyzed. We observed a significant developmental pattern of decreasing absolute EEG power in both groups. Nonetheless, ADHD was characterized by consistently lower absolute EGG power, mostly in the theta frequency band, in comparison to healthy controls. Our results are in line with the deviant brain maturation theory of ADHD, as the observed effects of age-related changes in EEG power are parallel but different in the two groups.
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Affiliation(s)
- Katarzyna Giertuga
- Laboratory of Neuroplasticity, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology of Polish Academy of SciencesWarsaw, Poland
| | - Marta Z. Zakrzewska
- Gösta Ekman Laboratory, Department of Psychology, Stockholm UniversityStockholm, Sweden
| | - Maksymilian Bielecki
- Department of Psychology, SWPS University of Social Sciences and HumanitiesWarsaw, Poland
| | | | - Malgorzata Kossut
- Laboratory of Neuroplasticity, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology of Polish Academy of SciencesWarsaw, Poland
- Department of Psychology, SWPS University of Social Sciences and HumanitiesWarsaw, Poland
| | - Anita Cybulska-Klosowicz
- Laboratory of Neuroplasticity, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology of Polish Academy of SciencesWarsaw, Poland
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30
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Bischoff AR, Pokhvisneva I, Léger É, Gaudreau H, Steiner M, Kennedy JL, O’Donnell KJ, Diorio J, Meaney MJ, Silveira PP. Dynamic interaction between fetal adversity and a genetic score reflecting dopamine function on developmental outcomes at 36 months. PLoS One 2017; 12:e0177344. [PMID: 28505190 PMCID: PMC5432105 DOI: 10.1371/journal.pone.0177344] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 04/26/2017] [Indexed: 12/27/2022] Open
Abstract
Background Fetal adversity, evidenced by poor fetal growth for instance, is associated with increased risk for several diseases later in life. Classical cut-offs to characterize small (SGA) and large for gestational age (LGA) newborns are used to define long term vulnerability. We aimed at exploring the possible dynamism of different birth weight cut-offs in defining vulnerability in developmental outcomes (through the Bayley Scales of Infant and Toddler Development), using the example of a gene vs. fetal adversity interaction considering gene choices based on functional relevance to the studied outcome. Methods 36-month-old children from an established prospective birth cohort (Maternal Adversity, Vulnerability, and Neurodevelopment) were classified according to birth weight ratio (BWR) (SGA ≤0.85, LGA >1.15, exploring a wide range of other cut-offs) and genotyped for polymorphisms associated with dopamine signaling (TaqIA-A1 allele, DRD2-141C Ins/Ins, DRD4 7-repeat, DAT1-10- repeat, Met/Met-COMT), composing a score based on the described function, in which hypofunctional variants received lower scores. Results There were 251 children (123 girls and 128 boys). Using the classic cut-offs (0.85 and 1.15), there were no statistically significant interactions between the neonatal groups and the dopamine genetic score. However, when changing the cut-offs, it is possible to see ranges of BWR that could be associated with vulnerability to poorer development according to the variation in the dopamine function. Conclusion The classic birth weight cut-offs to define SGA and LGA newborns should be seen with caution, as depending on the outcome in question, the protocols for long-term follow up could be either too inclusive—therefore most costly, or unable to screen true vulnerabilities—and therefore ineffective to establish early interventions and primary prevention.
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Affiliation(s)
- Adrianne R. Bischoff
- Department of Pediatrics, Division of Neonatology, University of Toronto and the Hospital for Sick Children, Toronto, Ontario, Canada
| | - Irina Pokhvisneva
- Ludmer Centre for Neuroinformatics and Mental Health, Douglas Mental Health University Institute, McGill University, Douglas Mental Health University Institute, Montreal, Quèbec, Canada
| | - Étienne Léger
- Ludmer Centre for Neuroinformatics and Mental Health, Douglas Mental Health University Institute, McGill University, Douglas Mental Health University Institute, Montreal, Quèbec, Canada
| | - Hélène Gaudreau
- Ludmer Centre for Neuroinformatics and Mental Health, Douglas Mental Health University Institute, McGill University, Douglas Mental Health University Institute, Montreal, Quèbec, Canada
| | - Meir Steiner
- Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, Ontario, Canada
| | - James L. Kennedy
- Department of Psychiatry, University of Toronto and Centre for Addiction and Mental Health, Toronto, Ontario, Canada
| | - Kieran J. O’Donnell
- Ludmer Centre for Neuroinformatics and Mental Health, Douglas Mental Health University Institute, McGill University, Douglas Mental Health University Institute, Montreal, Quèbec, Canada
- Child and Brain Development Program, Canadian Institute for Advanced Research (CIFAR), Toronto, Ontario, Canada
- Department of Psychiatry, McGill University, Montreal, Quebec, Canada
| | - Josie Diorio
- Ludmer Centre for Neuroinformatics and Mental Health, Douglas Mental Health University Institute, McGill University, Douglas Mental Health University Institute, Montreal, Quèbec, Canada
| | - Michael J. Meaney
- Ludmer Centre for Neuroinformatics and Mental Health, Douglas Mental Health University Institute, McGill University, Douglas Mental Health University Institute, Montreal, Quèbec, Canada
- Department of Psychiatry, McGill University, Montreal, Quebec, Canada
| | - Patrícia P. Silveira
- Ludmer Centre for Neuroinformatics and Mental Health, Douglas Mental Health University Institute, McGill University, Douglas Mental Health University Institute, Montreal, Quèbec, Canada
- Department of Psychiatry, McGill University, Montreal, Quebec, Canada
- * E-mail:
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Cupertino RB, Schuch JB, Bandeira CE, da Silva BS, Rovaris DL, Kappel DB, Contini V, Salatino-Oliveira A, Vitola ES, Karam RG, Hutz MH, Rohde LA, Grevet EH, Bau CHD, Mota NR. Replicated association of Synaptotagmin (SYT1) with ADHD and its broader influence in externalizing behaviors. Eur Neuropsychopharmacol 2017; 27:239-247. [PMID: 28130000 DOI: 10.1016/j.euroneuro.2017.01.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 10/30/2016] [Accepted: 01/05/2017] [Indexed: 12/20/2022]
Abstract
Attention-Deficit/Hyperactivity Disorder (ADHD) is a common psychiatric disorder, affecting both children and adults. The Soluble N-ethylmaleimide sensitive factor Attachment REceptors (SNARE) complex has been implicated in ADHD pathophysiology since it is a key component of neurotransmitter release events and neurodevelopment processes, and SNPs in this complex have been associated with ADHD. Here we aim to analyze the effects of SNARE complex variants on ADHD susceptibility and its clinical heterogeneity in affected adults. We tested the association between ADHD and polymorphisms on the SNARE genes STX1A (rs2228607), SYT1 (rs1880867 and rs2251214), VAMP2 (26bp Ins/Del) and SNAP25 (rs6108461 and rs8636) on a sample comprised of 548 adults with ADHD and 644 non-affected controls. Regarding clinical heterogeneity, we further investigated the effects of associated SNPs on age at onset of impairment due to ADHD and on relevant externalizing behaviors (i.e. school suspensions/expulsions and problems with law/authority) and comorbidities (i.e. Substance Use Disorder, Oppositional Defiant Disorder, Conduct Disorder and Antisocial Personality Disorder). We replicated a previously reported association between SYT1-rs2251214 and ADHD in adulthood. This SNP was also associated with age at onset of impairment due to ADHD symptoms and with a range of externalizing phenotypes. These findings involving SYT1 suggest that variation in neurotransmitter exocytosis mechanisms may represent an underlying genetic factor shared by a spectrum of externalizing behaviors and disorders, including - but not restricted to - ADHD.
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Affiliation(s)
- Renata Basso Cupertino
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Jaqueline Bohrer Schuch
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Cibele Edom Bandeira
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Bruna Santos da Silva
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Diego Luiz Rovaris
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Djenifer B Kappel
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Verônica Contini
- PPGBIOTEC - Postgraduate Program in Biotechnology, Centro Universitário Univates, Lajeado, Brazil
| | - Angélica Salatino-Oliveira
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Eduardo Schneider Vitola
- Department of Psychiatry, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Rafael Gomes Karam
- ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Mara Helena Hutz
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Luis Augusto Rohde
- Department of Psychiatry, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil; National Institute of Developmental Psychiatry for Children and Adolescents, Brazil
| | - Eugenio Horacio Grevet
- Department of Psychiatry, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Claiton Henrique Dotto Bau
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; ADHD Outpatient Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil.
| | - Nina Roth Mota
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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Rojas-Mayorquín AE, Padilla-Velarde E, Ortuño-Sahagún D. Prenatal Alcohol Exposure in Rodents As a Promising Model for the Study of ADHD Molecular Basis. Front Neurosci 2016; 10:565. [PMID: 28018163 PMCID: PMC5156702 DOI: 10.3389/fnins.2016.00565] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 11/23/2016] [Indexed: 12/17/2022] Open
Abstract
A physiological parallelism, or even a causal effect relationship, can be deducted from the analysis of the main characteristics of the “Alcohol Related Neurodevelopmental Disorders” (ARND), derived from prenatal alcohol exposure (PAE), and the behavioral performance in the Attention-deficit/hyperactivity disorder (ADHD). These two clinically distinct disease entities, exhibits many common features. They affect neurological shared pathways, and also related neurotransmitter systems. We briefly review here these parallelisms, with their common and uncommon characteristics, and with an emphasis in the subjacent molecular mechanisms of the behavioral manifestations, that lead us to propose that PAE in rats can be considered as a suitable model for the study of ADHD.
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Affiliation(s)
- Argelia E Rojas-Mayorquín
- Departamento de Ciencias Ambientales, Centro Universitario de Ciencias Biológicas y Agropecuarias, Instituto de Neurociencias, Universidad de Guadalajara Guadalajara, Mexico
| | - Edgar Padilla-Velarde
- Departamento de Ciencias Ambientales, Centro Universitario de Ciencias Biológicas y Agropecuarias, Instituto de Neurociencias, Universidad de Guadalajara Guadalajara, Mexico
| | - Daniel Ortuño-Sahagún
- Departamento de Biología Molecular y Genómica, Instituto de Investigación en Ciencias Biomédicas, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara Guadalajara, Mexico
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Akutagava-Martins GC, Salatino-Oliveira A, Kieling C, Genro JP, Polanczyk GV, Anselmi L, Menezes AM, Gonçalves H, Wehrmeister FC, Barros FC, Callegari-Jacques SM, Rohde LA, Hutz MH. COMT and DAT1 genes are associated with hyperactivity and inattention traits in the 1993 Pelotas Birth Cohort: evidence of sex-specific combined effect. J Psychiatry Neurosci 2016; 41:405-412. [PMID: 27327562 PMCID: PMC5082511 DOI: 10.1503/jpn.150270] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Attention-deficit/hyperactivity disorder (ADHD) symptoms are dimensionally distributed in the population. This study aimed to assess the role of the catechol-O-methyltransferase (COMT) and of the dopamine transporter (DAT1) genes on ADHD symptoms in the general population. METHODS We investigated 4101 individuals from the 1993 Pelotas Birth Cohort Study using the parent version of the Strengths and Difficulties Questionnaire (SDQ) at ages 11 and 15 years. The SDQ hyperactivity/inattention scores were the main outcomes. RESULTS Linear regression analyses demonstrated that the increasing number of COMT158Val and DAT1 10R alleles significantly predicted increasing SDQ hyperactivity/inattention scores in boys at both 11 and 15 years of age (β coefficient = 0.049, t = 2.189, p = 0.029, R2 = 0.012, and β coefficient = 0.064, t = 2.832, p = 0.005, R2 = 0.008, respectively). The presence of both COMT158Val and DAT1 10R alleles was also associated with full categorical ADHD diagnosis at 18 years of age in boys (χ2 = 4.561, p = 0.033, odds ratio 2.473, 95% confidence interval 1.048-5.838) from this cohort. We did not observe these associations in girls. LIMITATIONS Our analyses of SDQ hyperactivity/inattention scores were not corrected for SDQ scores of conduct problems because these variables were highly correlated. CONCLUSION This study demonstrates a role for COMT and DAT1 genes on hyperactivity/inattention symptoms and provides further support for ADHD as the extreme of traits that vary in the population. It also confirms previous evidence for sexual dimorphism on COMT and DAT1 gene expression.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | - Mara H. Hutz
- Correspondence to: M.H. Hutz, Universidade Federal do Rio Grande do Sul, Departamento de Genética, Caixa postal, RS, Brazil;
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Excessive Sensory Stimulation during Development Alters Neural Plasticity and Vulnerability to Cocaine in Mice. eNeuro 2016; 3:eN-NWR-0199-16. [PMID: 27588306 PMCID: PMC4994069 DOI: 10.1523/eneuro.0199-16.2016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 08/01/2016] [Accepted: 08/09/2016] [Indexed: 12/16/2022] Open
Abstract
Early life experiences affect the formation of neuronal networks, which can have a profound impact on brain function and behavior later in life. Previous work has shown that mice exposed to excessive sensory stimulation during development are hyperactive and novelty seeking, and display impaired cognition compared with controls. In this study, we addressed the issue of whether excessive sensory stimulation during development could alter behaviors related to addiction and underlying circuitry in CD-1 mice. We found that the reinforcing properties of cocaine were significantly enhanced in mice exposed to excessive sensory stimulation. Moreover, although these mice displayed hyperactivity that became more pronounced over time, they showed impaired persistence of cocaine-induced locomotor sensitization. These behavioral effects were associated with alterations in glutamatergic transmission in the nucleus accumbens and amygdala. Together, these findings suggest that excessive sensory stimulation in early life significantly alters drug reward and the neural circuits that regulate addiction and attention deficit hyperactivity. These observations highlight the consequences of early life experiences and may have important implications for children growing up in today's complex technological environment.
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Association of current phthalate exposure with neurobehavioral development in a national sample. Int J Hyg Environ Health 2016; 219:364-71. [DOI: 10.1016/j.ijheh.2016.03.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 02/21/2016] [Accepted: 03/01/2016] [Indexed: 11/17/2022]
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Başay Ö, Basay BK, Öztürk Ö, Yüncü Z. Acute Dystonia Following a Switch in Treatment from Atomoxetine to Low-dose Aripiprazole. CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE : THE OFFICIAL SCIENTIFIC JOURNAL OF THE KOREAN COLLEGE OF NEUROPSYCHOPHARMACOLOGY 2016; 14:221-5. [PMID: 27121436 PMCID: PMC4857866 DOI: 10.9758/cpn.2016.14.2.221] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 09/10/2015] [Accepted: 11/12/2015] [Indexed: 11/18/2022]
Abstract
The present report describes the cases of a 17-year-old male patient and a 13-year-old female patient who developed acute dystonia following the administration of low-dose aripiprazole (5 mg/day) after the cessation of atomoxetine treatment. Although aripiprazole-induced dystonia has been previously reported in the literature, it is rare, and most of these cases were associated with doses higher than 5 mg/day. Furthermore, both of the patients in the present study discontinued atomoxetine prior to the initiation of aripiprazole treatment; thus, this report also discussed the possible mechanisms underlying the manifestation of dystonia from the perspective of neurotransmitter activity.
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Affiliation(s)
- Ömer Başay
- Department of Child and Adolescent Psychiatry, School of Medicine, Pamukkale University, Denizli
| | - Burge Kabukcu Basay
- Department of Child and Adolescent Psychiatry, School of Medicine, Pamukkale University, Denizli
| | - Önder Öztürk
- Department of Child and Adolescent Psychiatry, School of Medicine, Pamukkale University, Denizli
| | - Zeki Yüncü
- Department of Child and Adolescent Psychiatry, School of Medicine, Ege University, Izmir, Turkey
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Martelle SE, Raffield LM, Palmer ND, Cox AJ, Freedman BI, Hugenschmidt CE, Williamson JD, Bowden DW. Dopamine pathway gene variants may modulate cognitive performance in the DHS - Mind Study. Brain Behav 2016; 6:e00446. [PMID: 27066308 PMCID: PMC4797918 DOI: 10.1002/brb3.446] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 01/04/2016] [Accepted: 01/11/2016] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND There is an established association between type 2 diabetes and accelerated cognitive decline. The exact mechanism linking type 2 diabetes and reduced cognitive function is less clear. The monoamine system, which is extensively involved in cognition, can be altered by type 2 diabetes status. Thus, this study hypothesized that sequence variants in genes linked to dopamine metabolism and associated pathways are associated with cognitive function as assessed by the Digit Symbol Substitution Task, the Modified Mini-Mental State Examination, the Stroop Task, the Rey Auditory-Verbal Learning Task, and the Controlled Oral Word Association Task for Phonemic and Semantic Fluency in the Diabetes Heart Study, a type 2 diabetes-enriched familial cohort (n = 893). METHODS To determine the effects of candidate variants on cognitive performance, genetic association analyses were performed on the well-documented variable number tandem repeat located in the 3' untranslated region of the dopamine transporter, as well as on single-nucleotide polymorphisms covering genes in the dopaminergic pathway, the insulin signaling pathway, and the convergence of both. Next, polymorphisms in loci of interest with strong evidence for involvement in dopamine processing were extracted from genetic datasets available in a subset of the cohort (n = 572) derived from Affymetrix(®) Genome-Wide Human SNP Array 5.0 and 1000 Genomes imputation from this array. RESULTS The candidate gene analysis revealed one variant from the DOPA decarboxylase gene, rs10499695, to be associated with poorer performance on a subset of Rey Auditory-Verbal Learning Task measuring retroactive interference (P = 0.001, β = -0.45). Secondary analysis of genome-wide and imputed data uncovered another DOPA decarboxylase variant, rs62445903, also associated with retroactive interference (P = 7.21 × 10(-7), β = 0.3). These data suggest a role for dopaminergic genes, specifically a gene involved in regulation of dopamine synthesis, in cognitive performance in type 2 diabetes.
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Affiliation(s)
- Susan E Martelle
- Department of Physiology and Pharmacology Wake Forest School of Medicine Winston - Salem North Carolina; Center for Genomics and Personalized Medicine Research Wake Forest School of Medicine Winston - Salem North Carolina
| | - Laura M Raffield
- Center for Genomics and Personalized Medicine Research Wake Forest School of Medicine Winston - Salem North Carolina
| | - Nichole D Palmer
- Center for Genomics and Personalized Medicine Research Wake Forest School of Medicine Winston - Salem North Carolina
| | - Amanda J Cox
- Molecular Basis of Disease Griffith University Southport Brisbane Queensland Australia
| | - Barry I Freedman
- Department of Internal Medicine, Nephrology Wake Forest School of Medicine Winston - Salem North Carolina
| | - Christina E Hugenschmidt
- Department of Internal Medicine, Gerontology and Geriatric Medicine Wake Forest School of Medicine Winston - Salem North Carolina
| | - Jeff D Williamson
- Department of Internal Medicine, Gerontology and Geriatric Medicine Wake Forest School of Medicine Winston - Salem North Carolina
| | - Don W Bowden
- Center for Genomics and Personalized Medicine Research Wake Forest School of Medicine Winston - Salem North Carolina
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Ercan ES, Suren S, Bacanlı A, Yazici KU, Callı C, Ozyurt O, Aygunes D, Kosova B, Franco AR, Rohde LA. Decreasing ADHD phenotypic heterogeneity: searching for neurobiological underpinnings of the restrictive inattentive phenotype. Eur Child Adolesc Psychiatry 2016; 25:273-82. [PMID: 26058607 DOI: 10.1007/s00787-015-0731-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 05/30/2015] [Indexed: 11/25/2022]
Abstract
During the process of developing the DSM-5, a new phenotype of ADHD was proposed-the ADHD restrictive inattentive presentation (ADHD-RI), describing subjects with high endorsement of inattentive symptoms and a low level of hyperactivity. However, this phenotype was not included in the DSM-5 because of the lack of robust neurobiological data. We aimed to assess the specific neurobiological underpinnings of individuals presenting ADHD-RI. We compared a sample of 301 subjects (101 ADHD-Combined; 50 ADHD-RI; 50 ADHD predominantly inattentive type and 100 typically developing subjects) aged 8-15 years, using a complete neuropsychological battery, molecular genetic data (DRD4 and DAT1 most studied polymorphisms) and functional MRI during a Go-No/Go task. Subjects with ADHD-RI had a significantly different neuropsychological profile compared with the other groups, including lower psychomotor speeds, longer reaction times and the worst overall performance in the global neurocognitive index. The proportion of subjects with the presence of DRD4-7 repeat allele was significantly higher in ADHD-RI. The fMRI data suggested that more attention-related posterior brain regions (especially temporo-occipital areas) are activated in ADHD-RI during both Go and No-Go cues compared to TD controls and ADHD predominantly inattentive type. ADHD-RI may represent a different phenotype than other types of ADHD. In addition, our results suggest that reducing the phenotypic heterogeneity may aid in the search for the neurobiological underpinnings of ADHD.
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Affiliation(s)
- Eyup Sabri Ercan
- Child and Adolescent Psychiatry Department, Medical Faculty, Ege University, Izmir, Turkey.
| | | | | | - Kemal Utku Yazici
- Child and Adolescent Psychiatry Department, Medical Faculty, Fırat University, Elazig, Turkey
| | - Cem Callı
- Radiology Department, Medical Faculty, Ege University, Izmir, Turkey
| | - Onur Ozyurt
- Institute of Biomedical Engineering, Bogazici University, Istanbul, Turkey
| | - Duygu Aygunes
- Medical Biology Department, Medical Faculty, Ege University, Izmir, Turkey
| | - Buket Kosova
- Medical Biology Department, Medical Faculty, Ege University, Izmir, Turkey
| | - Alexandre Rosa Franco
- Brain Institute of Rio Grande do Sul (InsCer), PUCRS, Porto Alegre, Brazil.,School of Engineering, PUCRS, Porto Alegre, Brazil
| | - Luis Augusto Rohde
- Department of Psychiatry, ADHD Outpatient Program, Hospital de Clinicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.,National Institute of Developmental Psychiatry for Children and Adolescents, São Paulo, Brazil
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Kumar U, Medel-Matus JS, Redwine HM, Shin D, Hensler JG, Sankar R, Mazarati A. Effects of selective serotonin and norepinephrine reuptake inhibitors on depressive- and impulsive-like behaviors and on monoamine transmission in experimental temporal lobe epilepsy. Epilepsia 2016; 57:506-15. [PMID: 26813337 DOI: 10.1111/epi.13321] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2015] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Examine therapeutic potential of a selective serotonin reuptake inhibitor (SSRI) and a norepinephrine reuptake inhibitor (NERI) in an animal model of comorbidity between epilepsy, depression-like, and impulsive-like impairments. METHODS Epilepsy was induced in male Wistar rats by LiCl and pilocarpine. An SSRI fluoxetine (FLX), and an NERI reboxetine (RBX) were administered either alone or as a combination over 1 week. Depressive-like and impulsive-like behaviors were examined using the forced swim test. Fast scan cyclic voltammetry was used to analyze serotonergic transmission in the raphe nucleus (RN)-prefrontal cortex (PFC) pathway, and noradrenergic transmission in locus coeruleus (LC)-PFC, and LC-RN projections. Monoamine levels in PFC were measured using high-performance liquid chromatography (HPLC). Functional capacities of 5-HT1A receptors and α2A adrenoreceptors in PFC were analyzed by autoradiography. RESULTS Epileptic rats showed behavioral signs of depression and hyperimpulsivity, suppressed serotonergic and noradrenergic tones, decreased levels of serotonin (5-HT), and norepinephrine (NE); 5-HT1A receptor and α2A adrenoreceptors functions remained intact. FLX failed to improve behavioral deficits, but effectively raised 5-HT level and marginally improved RN-PFC serotonergic transmission. RBX reversed impulsive-like behavior, normalized content of NE and noradrenergic tone in LC-PFC and LC-RN. FLX-RBX combination fully reversed depressive-like behavior, and normalized RN-PFC serotonergic transmission. None of the treatment modified the function of 5-HT and NE receptors. SIGNIFICANCE Depressive- and impulsive-like behaviors in the pilocarpine model of epilepsy stem respectively from dysfunctions of serotonergic and noradrenergic ascending pathways. At the same time, epilepsy-associated depression is SSRI resistant. The finding that an SSRI-NERI combination exerts antidepressant effect, along with RBX-induced improvement of LC-RN noradrenergic transmission point toward the involvement of LC-RN noradrenergic input in enabling therapeutic potential of FLX. Medications that improve serotonergic and noradrenergic transmission, such as serotonin-norepinephrine reuptake inhibitors may be effective in treating epilepsy-associated SSRI-resistant depression, as well as concurrent depression and attention-deficit/hyperactivity disorder (ADHD).
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Affiliation(s)
- Udaya Kumar
- Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, U.S.A
| | | | - Hannah M Redwine
- Department of Pharmacology, University of Texas Health Science Center-San Antonio, San Antonio, Texas, U.S.A
| | - Don Shin
- Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, U.S.A
| | - Julie G Hensler
- Department of Pharmacology, University of Texas Health Science Center-San Antonio, San Antonio, Texas, U.S.A
| | - Raman Sankar
- Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, U.S.A.,Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, California, U.S.A.,UCLA Children's Discovery and Innovation Institute, Los Angeles, California, U.S.A
| | - Andrey Mazarati
- Department of Pediatrics, David Geffen School of Medicine at UCLA, Los Angeles, California, U.S.A.,UCLA Children's Discovery and Innovation Institute, Los Angeles, California, U.S.A
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40
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Akutagava-Martins GC, Rohde LA, Hutz MH. Genetics of attention-deficit/hyperactivity disorder: an update. Expert Rev Neurother 2016; 16:145-56. [DOI: 10.1586/14737175.2016.1130626] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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41
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Gomez-Sanchez CI, Riveiro-Alvarez R, Soto-Insuga V, Rodrigo M, Tirado-Requero P, Mahillo-Fernandez I, Abad-Santos F, Carballo JJ, Dal-Ré R, Ayuso C. Attention deficit hyperactivity disorder: genetic association study in a cohort of Spanish children. Behav Brain Funct 2016; 12:2. [PMID: 26746237 PMCID: PMC4706690 DOI: 10.1186/s12993-015-0084-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 12/02/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Attention deficit hyperactivity disorder (ADHD) has a strong genetic component. The study is aimed to test the association of 34 polymorphisms with ADHD symptomatology considering the role of clinical subtypes and sex in a Spanish population. METHODS A cohort of ADHD 290 patients and 340 controls aged 6-18 years were included in a case-control study, stratified by sex and ADHD subtype. Multivariate logistic regression was used to detect the combined effects of multiple variants. RESULTS After correcting for multiple testing, we found several significant associations between the polymorphisms and ADHD (p value corrected ≤0.05): (1) SLC6A4 and LPHN3 were associated in the total population; (2) SLC6A2, SLC6A3, SLC6A4 and LPHN3 were associated in the combined subtype; and (3) LPHN3 was associated in the male sample. Multivariable logistic regression was used to estimate the influence of these variables for the total sample, combined and inattentive subtype, female and male sample, revealing that these factors contributed to 8.5, 14.6, 2.6, 16.5 and 8.5 % of the variance respectively. CONCLUSIONS We report evidence of the genetic contribution of common variants to the ADHD phenotype in four genes, with the LPHN3 gene playing a particularly important role. Future studies should investigate the contribution of genetic variants to the risk of ADHD considering their role in specific sex or subtype, as doing so may produce more predictable and robust models.
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Affiliation(s)
- Clara I Gomez-Sanchez
- Department of Genetics, IIS-Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Avda. Reyes Católicos 2, 28040, Madrid, Spain. .,Centre for Biomedical Research on Rare Diseases (CIBERER), C/Monforte de Lemos 3-5, Pabellón 11, 28029, Madrid, Spain.
| | - Rosa Riveiro-Alvarez
- Department of Genetics, IIS-Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Avda. Reyes Católicos 2, 28040, Madrid, Spain. .,Centre for Biomedical Research on Rare Diseases (CIBERER), C/Monforte de Lemos 3-5, Pabellón 11, 28029, Madrid, Spain.
| | - Victor Soto-Insuga
- Department of Pediatrics, IIS-Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Avda. Reyes Católicos 2, 28040, Madrid, Spain.
| | - Maria Rodrigo
- Department of Pediatrics, IIS-Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Avda. Reyes Católicos 2, 28040, Madrid, Spain.
| | - Pilar Tirado-Requero
- Department of Pediatrics, La Paz University Hospital, Paseo de la Castellana 261, 28046, Madrid, Spain.
| | - Ignacio Mahillo-Fernandez
- Department of Epidemiology, IIS-Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Avda. Reyes Católicos 2, 28040, Madrid, Spain.
| | - Francisco Abad-Santos
- Clinical Pharmacology Department, Instituto de Investigación Sanitaria Princesa (IP), Hospital Universitario de la Princesa, C/Diego de Leon 62, 28006, Madrid, Spain.
| | - Juan J Carballo
- Department of Psychiatry, IIS-Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Avda. Reyes Católicos 2, 28040, Madrid, Spain.
| | - Rafael Dal-Ré
- Clinical Research, BUC (Biosciences UAM + CSIC) Program, International Campus of Excellence, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
| | - Carmen Ayuso
- Department of Genetics, IIS-Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Avda. Reyes Católicos 2, 28040, Madrid, Spain. .,Centre for Biomedical Research on Rare Diseases (CIBERER), C/Monforte de Lemos 3-5, Pabellón 11, 28029, Madrid, Spain.
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Fang Y, Ji N, Cao Q, Su Y, Chen M, Wang Y, Yang L. Variants of Dopamine Beta Hydroxylase Gene Moderate Atomoxetine Response in Children with Attention-Deficit/Hyperactivity Disorder. J Child Adolesc Psychopharmacol 2015; 25:625-32. [PMID: 26447643 PMCID: PMC4615817 DOI: 10.1089/cap.2014.0178] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Atomoxetine is the most widely used nonstimulant for the treatment of attention-deficit/hyperactivity disorder (ADHD). It selectively acts on the norepinephrine (NE) system. Dopamine beta hydroxylase (DBH) regulates the synthesis of NE. This study aimed to investigate whether variants in the DBH gene have an effect on the differential response to atomoxetine. METHODS Children and adolescents with ADHD were enrolled in a prospective, open-label study of atomoxetine for 8-12 weeks. The dose was titrated to 1.2-1.4 mg/kg per day and maintained for at least 4 weeks. The primary efficacy measure was the investigator-rated ADHD Rating Scale-IV (ADHD-RS-IV). Three categorical evaluations of treatment effects (defined as response, robust response, and remission) were used. We used a candidate gene approach. Eight single nucleotide polymorphisms (SNPs) in DBH were selected and genotyped based on the functional annotation in literature. Their association with response or remission status was analyzed. RESULTS Four SNPs were found nominally associated with response status (rs1076150, p = 0.0484; rs2873804, p = 0.0348; rs1548364, p = 0.0383; and rs2519154, p = 0.0097), two were associated with robust response (rs1076150, p = 0.0349; and rs2519154, p = 0.0047), and one was associated with remission (rs2519154, p = 0.0479). The association between rs2519154 and robust response was significant after correction of multiple comparison (p = 0.0384). Two haplotypes of linkage disequilibrium (LD) block1 (constituted by rs1108580, rs2873804, rs1548364, and rs2519154) were nominally associated with response and robust response status (CTAC: p = 0.0301 for response, p = 0.0374 for robust response; TCGT: p = 0.0317 for response, p = 0.021 for robust response), whereas one haplotype (GC) of LD block2 (constituted by rs2073837 and rs129882) was associated with robust response and remission status (p = 0.0377 for robust response; p = 0.0321 for remission), although none achieved significant threshold after multiple comparison. CONCLUSIONS Variants in DBH genes were associated with atomoxetine response in the treatment of ADHD. Further replication in larger samples would be warranted.
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Affiliation(s)
- Yantong Fang
- The Affiliated Hospital Hangzhou Normal University, Hangzhou, China
| | - Ning Ji
- Beijing University Sixth Hospital/Institute of Mental Health, Key Laboratory of Mental Health, Ministry of Health, Beijing, China.,National Clinical Research Center for Mental Disorders, Beijing University Sixth Hospital, Beijing, China
| | - Qingjiu Cao
- Beijing University Sixth Hospital/Institute of Mental Health, Key Laboratory of Mental Health, Ministry of Health, Beijing, China.,National Clinical Research Center for Mental Disorders, Beijing University Sixth Hospital, Beijing, China
| | - Yi Su
- Beijing University Sixth Hospital/Institute of Mental Health, Key Laboratory of Mental Health, Ministry of Health, Beijing, China.,National Clinical Research Center for Mental Disorders, Beijing University Sixth Hospital, Beijing, China
| | - Min Chen
- Beijing University Sixth Hospital/Institute of Mental Health, Key Laboratory of Mental Health, Ministry of Health, Beijing, China.,National Clinical Research Center for Mental Disorders, Beijing University Sixth Hospital, Beijing, China
| | - Yufeng Wang
- Beijing University Sixth Hospital/Institute of Mental Health, Key Laboratory of Mental Health, Ministry of Health, Beijing, China.,National Clinical Research Center for Mental Disorders, Beijing University Sixth Hospital, Beijing, China
| | - Li Yang
- Beijing University Sixth Hospital/Institute of Mental Health, Key Laboratory of Mental Health, Ministry of Health, Beijing, China.,National Clinical Research Center for Mental Disorders, Beijing University Sixth Hospital, Beijing, China
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43
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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: 58] [Impact Index Per Article: 6.4] [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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44
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Mota NR, Rovaris DL, Kappel DB, Picon FA, Vitola ES, Salgado CAI, Karam RG, Rohde LA, Grevet EH, Bau CHD. NCAM1-TTC12-ANKK1-DRD2 gene cluster and the clinical and genetic heterogeneity of adults with ADHD. Am J Med Genet B Neuropsychiatr Genet 2015; 168:433-444. [PMID: 25989041 DOI: 10.1002/ajmg.b.32317] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2014] [Accepted: 04/07/2015] [Indexed: 12/23/2022]
Abstract
Dysfunctions of the dopaminergic system have been implicated on the etiology of Attention Deficit/Hyperactivity Disorder (ADHD). Meta-analyses addressing the association of the dopamine receptor D2 (DRD2) gene and ADHD were inconclusive due to excessive heterogeneity across studies. Both the great phenotypic heterogeneity of ADHD and the complexity of the genomic region where DRD2 is located could contribute to the inconsistent findings. Most previous DRD2 studies focused on the well-known Taq1A (rs1800497) SNP, which is actually placed in a neighbor gene (ANKK1). These two genes, together with NCAM1 and TTC12, form the NTAD gene cluster on Chr11q22-23. In order to address the reasons for the high heterogeneity previously reported on DRD2 effects on ADHD, this study investigates the role of NTAD variants on ADHD susceptibility in adults and on the modulation of comorbidity and personality profiles in these patients. Functional polymorphisms from NTAD were analyzed, both individually and in haplotypes, on a sample of 520 adults with ADHD and 630 non-ADHD controls. No direct association of NTAD variants with ADHD susceptibility itself was observed. However, different NTAD polymorphisms and haplotypes were associated to various phenotypes relevant to the clinical heterogeneity of ADHD, including Major Depressive Disorder, Generalized Anxiety Disorder, and Harm Avoidance and Persistence temperament scores. Therefore, these findings represent a possible explanation for the multiple conflicting findings regarding polymorphisms in this genomic region in psychiatry. The NTAD cluster may comprise a variety of independent molecular influences on various brain and behavior characteristics eventually associated with ADHD comorbidities and personality traits. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Nina R Mota
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
| | - Diego L Rovaris
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
| | - Djenifer B Kappel
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
| | - Felipe A Picon
- ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
| | - Eduardo S Vitola
- ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
| | - Carlos A I Salgado
- ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
| | - Rafael G Karam
- ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
| | - Luis A Rohde
- ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil.,Department of Psychiatry, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Eugenio H Grevet
- ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil.,Department of Psychiatry, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Claiton H D Bau
- Department of Genetics, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,ADHD Outpatient Program-Adult Division, Hospital de Clínicas, de Porto Alegre, Porto Alegre, Brazil
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45
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Mette C, Grabemann M, Zimmermann M, Strunz L, Scherbaum N, Wiltfang J, Kis B. No Clear Association between Impaired Short-Term or Working Memory Storage and Time Reproduction Capacity in Adult ADHD Patients. PLoS One 2015. [PMID: 26221955 PMCID: PMC4519336 DOI: 10.1371/journal.pone.0133714] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE Altered time reproduction is exhibited by patients with adult attention deficit hyperactivity disorder (ADHD). It remains unclear whether memory capacity influences the ability of adults with ADHD to reproduce time intervals. METHOD We conducted a behavioral study on 30 ADHD patients who were medicated with methylphenidate, 29 unmedicated adult ADHD patients and 32 healthy controls (HCs). We assessed time reproduction using six time intervals (1 s, 4 s, 6 s, 10 s, 24 s and 60 s) and assessed memory performance using the Wechsler memory scale. RESULTS The patients with ADHD exhibited lower memory performance scores than the HCs. No significant differences in the raw scores for any of the time intervals (p > .05), with the exception of the variability at the short time intervals (1 s, 4 s and 6 s) (p < .01), were found between the groups. The overall analyses failed to reveal any significant correlations between time reproduction at any of the time intervals examined in the time reproduction task and working memory performance (p > .05). CONCLUSION We detected no findings indicating that working memory might influence time reproduction in adult patients with ADHD. Therefore, further studies concerning time reproduction and memory capacity among adult patients with ADHD must be performed to verify and replicate the present findings.
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Affiliation(s)
- Christian Mette
- LVR Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
| | - Marco Grabemann
- LVR Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
| | - Marco Zimmermann
- LVR Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
| | - Laura Strunz
- LVR Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
| | - Norbert Scherbaum
- LVR Hospital Essen, Department of Psychiatry and Psychotherapy, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany
| | - Jens Wiltfang
- Department of Psychiatry and Psychotherapy, University Medical Center Goettingen, Goettingen, Germany
| | - Bernhard Kis
- Department of Psychiatry and Psychotherapy, University Medical Center Goettingen, Goettingen, Germany
- * E-mail: .
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46
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Tong JHS, Cummins TDR, Johnson BP, McKinley LA, Pickering HE, Fanning P, Stefanac NR, Newman DP, Hawi Z, Bellgrove MA. An association between a dopamine transporter gene (SLC6A3) haplotype and ADHD symptom measures in nonclinical adults. Am J Med Genet B Neuropsychiatr Genet 2015; 168B:89-96. [PMID: 25656223 DOI: 10.1002/ajmg.b.32283] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Indexed: 01/07/2023]
Abstract
Previous genetic studies have postulated that attention deficit hyperactivity disorder (ADHD) should be regarded as the extreme end of a set of behavioural traits that can be continuously measured in the general population. The current study adopted a quantitative trait approach to examine the relationship between dopamine gene variants and self-reported ADHD symptoms in 517 nonclinical adults. Although genetic associations with variants of both the dopamine transporter (DAT1; SLC6A3) and D4 receptor (DRD4) genes have been reliably reported in children, results in adults are less consistent. We probed two potentially functional variable number of tandem repeat (VNTR) polymorphisms in the 3'UTR and intron 8 of DAT1, the 10-repeat and 6-repeat alleles of which respectively form a haplotype (10/6 DAT1 haplotype) that is associated with childhood ADHD. We also genotyped the exon 3 VNTR of DRD4, the 7-repeat allele of which is also an established risk factor for childhood ADHD. Permutation analysis showed an influence of the 10/6 DAT1 haplotype on both CAARS-G and CAARS-H (DSM-IV ADHD Symptoms Total and ADHD Index respectively), such that ADHD symptom scores increased with each additional copy of the 10/6 DAT1 haplotype. This result survived corrections for multiple comparisons both at the level of genotype and phenotype. A nominal association with CAARS-G was also found for the 7-repeat allele of the DRD4 VNTR however this did not survive multiple comparison correction. Our results provide further support for the influence of variation in the 10/6 DAT1 haplotype and individual differences in ADHD symptoms in adults.
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Affiliation(s)
- Janette H S Tong
- Monash University, School of Psychological Sciences, Melbourne, Victoria, Australia
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47
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Factor-Litvak P, Insel B, Calafat AM, Liu X, Perera F, Rauh VA, Whyatt RM. Persistent Associations between Maternal Prenatal Exposure to Phthalates on Child IQ at Age 7 Years. PLoS One 2014; 9:e114003. [PMID: 25493564 PMCID: PMC4262205 DOI: 10.1371/journal.pone.0114003] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 10/29/2014] [Indexed: 11/28/2022] Open
Abstract
Background Prior research reports inverse associations between maternal prenatal urinary phthalate metabolite concentrations and mental and motor development in preschoolers. No study evaluated whether these associations persist into school age. Methods In a follow up of 328 inner-city mothers and their children, we measured prenatal urinary metabolites of di-n-butyl phthalate (DnBP), butylbenzyl phthalate (BBzP), di-isobutyl phthalate (DiBP), di-2-ethylhexyl phthalate and diethyl phthalate in late pregnancy. The Wechsler Intelligence Scale for Children, 4th edition was administered at child age 7 years and evaluates four areas of cognitive function associated with overall intelligence quotient (IQ). Results Child full-scale IQ was inversely associated with prenatal urinary metabolite concentrations of DnBP and DiBP: b = −2.69 (95% confidence interval [CI] = −4.33, −1.05) and b = −2.69 (95% CI = −4.22, −1.16) per log unit increase. Among children of mothers with the highest versus lowest quartile DnBP and DiBP metabolite concentrations, IQ was 6.7 (95% CI = 1.9, 11.4) and 7.6 (95% CI = 3.2, 12.1) points lower, respectively. Associations were unchanged after control for cognition at age 3 years. Significant inverse associations were also seen between maternal prenatal metabolite concentrations of DnBP and DiBP and child processing speed, perceptual reasoning and working memory; DiBP and child verbal comprehension; and BBzP and child perceptual reasoning. Conclusion Maternal prenatal urinary metabolite concentrations measured in late pregnancy of DnBP and DiBP are associated with deficits in children’s intellectual development at age 7 years. Because phthalate exposures are ubiquitous and concentrations seen here within the range previously observed among general populations, results are of public health significance.
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Affiliation(s)
- Pam Factor-Litvak
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, United States of America
| | - Beverly Insel
- Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, United States of America
| | - Antonia M Calafat
- National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Xinhua Liu
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, New York, United States of America
| | - Frederica Perera
- Department of Environmental Health Sciences, Columbia Center for Children's Environmental Health, Mailman School of Public Health, Columbia University, New York, New York, United States of America
| | - Virginia A Rauh
- Heilbrunn Department of Population and Family Health, Mailman School of Public Health, Columbia University, New York, New York, United States of America
| | - Robin M Whyatt
- Department of Environmental Health Sciences, Columbia Center for Children's Environmental Health, Mailman School of Public Health, Columbia University, New York, New York, United States of America
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48
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Moon SJ, Kim CJ, Lee YJ, Hong M, Han J, Bahn GH. Effect of atomoxetine on hyperactivity in an animal model of attention-deficit/hyperactivity disorder (ADHD). PLoS One 2014; 9:e108918. [PMID: 25271814 PMCID: PMC4182750 DOI: 10.1371/journal.pone.0108918] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 08/27/2014] [Indexed: 12/02/2022] Open
Abstract
Background Hyperactivity related behaviors as well as inattention and impulsivity are regarded as the nuclear symptoms of attention-deficit/hyperactivity disorder (ADHD). Purpose To investigate the therapeutic effects of atomoxetine on the motor activity in relation to the expression of the dopamine (DA) D2 receptor based on the hypothesis that DA system hypofunction causes ADHD symptoms, which would correlate with extensive D2 receptor overproduction and a lack of DA synthesis in specific brain regions: prefrontal cortex (PFC), striatum, and hypothalamus. Methods Young male spontaneously hypertensive rats (SHR), animal models of ADHD, were randomly divided into four groups according to the daily dosage of atomoxetine and treated for 21 consecutive days. The animals were assessed using an open-field test, and the DA D2 receptor expression was examined. Results The motor activity improved continuously in the group treated with atomoxetine at a dose of 1 mg/Kg/day than in the groups treated with atomoxetine at a dose of 0.25 mg/Kg/day or 0.5 mg/Kg/day. With respect to DA D2 receptor immunohistochemistry, we observed significantly increased DA D2 receptor expression in the PFC, striatum, and hypothalamus of the SHRs as compared to the WKY rats. Treatment with atomoxetine significantly decreased DA D2 expression in the PFC, striatum, and hypothalamus of the SHRs, in a dose-dependent manner. Conclusion Hyperactivity in young SHRs can be improved by treatment with atomoxetine via the DA D2 pathway.
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Affiliation(s)
- Su Jin Moon
- Department of Psychiatry, Daedong Hospital, Daegu, Korea
| | - Chang Ju Kim
- Department of Physiology, Kyung Hee University School of Medicine, Seoul, Korea
| | - Yeon Jung Lee
- Department of Psychiatry, Kyung Hee University School of Medicine, Seoul, Korea
| | - Minha Hong
- Department of Psychiatry, Dankook University Medical College, Cheonan, Korea
| | - Juhee Han
- Department of Psychiatry, Kyung Hee University School of Medicine, Seoul, Korea
| | - Geon Ho Bahn
- Department of Psychiatry, Kyung Hee University School of Medicine, Seoul, Korea
- * E-mail:
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49
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Akutagava-Martins GC, Salatino-Oliveira A, Genro JP, Contini V, Polanczyk G, Zeni C, Chazan R, Kieling C, Anselmi L, Menezes AMB, Grevet EH, Bau CHD, Rohde LA, Hutz MH. Glutamatergic copy number variants and their role in attention-deficit/hyperactivity disorder. Am J Med Genet B Neuropsychiatr Genet 2014; 165B:502-9. [PMID: 24985920 DOI: 10.1002/ajmg.b.32253] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 05/27/2014] [Indexed: 01/22/2023]
Abstract
Attention-Deficit/Hyperactivity Disorder (ADHD) is a common neurodevelopmental disorder with a strong genetic component. The glutamate metabotropic receptor genes (GRMs) have been considered potential candidates for ADHD susceptibility. The aim of the present study was to investigate if copy number variants (CNVs) in GRM1, GRM5, and GRM8 genes are overrepresented in ADHD subjects. A total of 1038 individuals with ADHD and 1057 subjects without this disorder were investigated. No significant difference in the total number of CNVs was found comparing the entire ADHD sample and the population sample without ADHD (P = 0.326, OR = 1.112, 95% CI = 0.762-1.624). The presence of CNVs was associated with lower intelligence quotient (IQ) scores in ADHD samples (P = 0.026, OR = 1.824, 95% CI = 1.066-3.121) but not in the sample of individuals without ADHD. CNVs in GRM5 were associated with presence of anxiety disorders in ADHD cases (P = 0.002, OR = 3.915, 95% CI = 1.631-9.402), but not in individuals without ADHD. Taken together, our results suggest a role for glutamate in ADHD as CNVs in the glutamatergic genes investigated herein were associated with cognitive and clinical characteristics of ADHD individuals.
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50
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Davies W. Sex differences in attention Deficit Hyperactivity Disorder: candidate genetic and endocrine mechanisms. Front Neuroendocrinol 2014; 35:331-46. [PMID: 24680800 DOI: 10.1016/j.yfrne.2014.03.003] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Revised: 02/13/2014] [Accepted: 03/17/2014] [Indexed: 02/07/2023]
Abstract
Attention Deficit Hyperactivity Disorder (ADHD) is a developmental condition characterised by severe inattention, pathological impulsivity and hyperactivity; it is relatively common affecting up to 6% of children, and is associated with a risk of long-term adverse educational and social consequences. Males are considerably more likely to be diagnosed with ADHD than females; the course of the disorder and its associated co-morbidities also appear to be sensitive to sex. Here, I discuss fundamental biological (genetic and endocrine) mechanisms that have been shown to, or could theoretically, contribute towards these sexually dimorphic phenomena. Greater understanding of how and why the sexes differ with respect to ADHD vulnerability should allow us to identify and characterise novel protective and risk factors for the disorder, and should ultimately facilitate improved diagnosis, prognosis and treatment.
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Affiliation(s)
- William Davies
- Behavioural Genetics Group, Neuroscience and Mental Health Research Institute, Schools of Psychology and Medicine, Cardiff University, Tower Building, Park Place, Cardiff CF10 3AT, UK; Medical Research Council Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, Hadyn Ellis Building, Cardiff CF24 4HQ, UK.
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