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catechol-o-methyltransferase

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https://www.readbyqxmd.com/read/29338612/gene-profiling-of-nucleus-basalis-tau-containing-neurons-in-chronic-traumatic-encephalopathy-a-chronic-effects-of-neurotrauma-consortium-study
#1
Elliott Jay Mufson, Bin He, Stephen D Ginsberg, Benjamin A Carper, Gayle S Bieler, Fiona C Crawford, Victor E Alverez, Bernard R Huber, Thor D Stein, Ann C McKee, Sylvia E Perez
Military personnel and athletes exposed to traumatic brain injury may develop chronic traumatic encephalopathy (CTE). Brain pathology in CTE includes intracellular accumulation of abnormally phosphorylated tau proteins (p-tau), the main constituent of neurofibrillary tangles (NFTs). Recently, we found that cholinergic basal forebrain (CBF) neurons within the nucleus basalis of Meynert (nbM), which provide the major cholinergic innervation to the cortex, display an increasing number of NFTs across the pathological stages of CTE...
January 16, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29331705/catechol-o-methyltransferase-comt-functional-haplotype-is-associated-with-recurrence-of-affective-symptoms-a-prospective-birth-cohort-study
#2
Shinsuke Koike, Darya Gaysina, Peter B Jones, Andrew Wong, Marcus Richards
BACKGROUND: Catechol-O-methyltransferase (COMT) polymorphisms play an essential role in dopamine availability in the brain. However, there has been no study investigating whether a functional four-SNP (rs6269-rs4633-rs4818-rs4680) haplotype is associated with affective symptoms over the life course. METHODS: We tested this using 2093 members of the Medical Research Council National Survey of Health and Development (MRC NSHD), who had been followed up since birth in 1946, and had data for COMT genotypes, adolescent emotional problems (age 13-15) and at least one measure of adult affective symptoms at ages 36, 43, 53, or 60-64 years...
January 6, 2018: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29325115/fast-sleep-spindle-density-is-associated-with-rs4680-val108-158met-genotype-of-catechol-o-methyltransferase-comt
#3
Claudia Schilling, Lena Gappa, Michael Schredl, Fabian Streit, Jens Treutlein, Josef Frank, Michael Deuschle, Andreas Meyer-Lindenberg, Marcella Rietschel, Stephanie H Witt
Study Objectives: Sleep spindles are a hallmark of NREM stage 2 sleep. Fast sleep spindles correlate with cognitive functioning, and are reduced in schizophrenia. Although spindles are highly genetically determined, distinct genetic mechanisms influencing sleep spindle activity have not been identified so far. Spindles are generated within a thalamo-cortical network. Dopaminergic neurotransmission modulates activity within this network and importantly depends on activity of catechol-O-methyltransferase (COMT)...
January 6, 2018: Sleep
https://www.readbyqxmd.com/read/29314589/effect-of-the-comt-val158met-genotype-on-lateral-prefrontal-activations-in-young-children
#4
Yusuke Moriguchi, Ikuko Shinohara
Low executive function (EF) during early childhood is a major risk factor for developmental delay, academic failure, and social withdrawal. Susceptible genes may affect the molecular and biological mechanisms underpinning EF. More specifically, genes associated with the regulation of prefrontal dopamine may modulate the response of prefrontal neurons during executive control. Several studies with adults and older children have shown that variants of the catechol-O-methyltransferase (COMT) gene are associated with behavioral performance and prefrontal activations in EF tasks...
January 4, 2018: Developmental Science
https://www.readbyqxmd.com/read/29289372/childhood-abuse-experiences-and-the-comt-and-mthfr-genetic-variants-associated-with-male-sexual-orientation-in-the-han-chinese-populations-a-case-control-study
#5
Jia-Bi Qin, Guang-Lu Zhao, Feng Wang, Yu-Mao Cai, Li-Na Lan, Lin Yang, Tie-Jian Feng
BACKGROUND: Although it is widely acknowledged that genetic and environmental factors are involved in the development of male homosexuality, the causes are not fully understood. AIM: To explore the association and interaction of childhood abuse experiences and genetic variants of the catechol-O-methyltransferase (COMT) and methylenetetrahydrofolate reductase (MTHFR) genes with the development of male homosexuality. METHODS: A case-control study of 537 exclusively homosexual men and 583 exclusively heterosexual men was conducted, with data collected from March 2013 to August 2015...
January 2018: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/29281938/pharmacophore-based-virtual-screening-of-catechol-o-methyltransferase-comt-inhibitors-to-combat-alzheimer-s-disease
#6
Chirag N Patel, John J Georrge, Krunal M Modi, Moksha B Narechania, Daxesh P Patel, Frank J Gonzalez, Himanshu A Pandya
Alzheimer's disease (AD) is one of the most significant neurodegenerative disorders and its symptoms mostly appear in aged people. Catechol-o-methyltransferase (COMT) is one of the known target enzymes responsible for AD. With the use of 23 known inhibitors of COMT, a query has been generated and validated by screening against the database of 1500 decoys to obtain the GH score and enrichment value. The crucial features of the known inhibitors were evaluated by the online ZINC Pharmer to identify new leads from a ZINC database...
December 27, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29259946/genetic-analysis-of-mu-and-kappa-opioid-receptor-and-comt-enzyme-in-cancer-pain-tunisian-patients-under-opioid-treatment
#7
Imen Chatti, Jean-Baptiste Woillard, Amira Mili, Isabelle Creveaux, Ilhem Ben Charfeddine, Jihène Feki, Sarah Langlais, Leila Ben Fatma, Ali Saad, Moez Gribaa, Frédéric Libert
Background: Pain and its opioid treatments are complex measurable traits. Responses to morphine in terms of pain control is likely to be determined by many factors, including the underlying pain sensitivity of the patient, along with nature and extent of the painful process, concomitant medications, genetic and other clinical and environmental factors. This study investigated genetic polymorphisms implicated in the inter-individual pain response variability to opioid treatment in the Tunisian population...
December 2017: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/29248857/catechol-o-methyltransferase-comt-genotype-affects-cognitive-control-during-total-sleep-deprivation
#8
Brieann C Satterfield, John M Hinson, Paul Whitney, Michelle A Schmidt, Jonathan P Wisor, Hans P A Van Dongen
Adaptive decision making is profoundly impaired by total sleep deprivation (TSD). This suggests that TSD impacts fronto-striatal pathways involved in cognitive control, where dopamine is a key neuromodulator. In the prefrontal cortex (PFC), dopamine is catabolized by the enzyme catechol-O-methyltransferase (COMT). A functional polymorphism (Val158Met) influences COMT's enzymatic activity, resulting in markedly different levels of prefrontal dopamine. We investigated the effect of this polymorphism on adaptive decision making during TSD...
November 26, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29248614/significant-association-between-catechol-o-methyltransferase-comt-val158-108met-polymorphism-and-cognitive-function-in-veterans-with-ptsd
#9
Ana Havelka Mestrovic, Lucija Tudor, Matea Nikolac Perkovic, Gordana Nedic Erjavec, Zrnka Kovacic Petrovic, Dubravka Svob Strac, Marcela Konjevod, Nela Pivac
Core features of posttraumatic stress disorder (PTSD) are cognitive disturbances. Enzyme catechol-O-methyltransferase (COMT) degrades dopamine primarily in prefrontal cortex. Its functional polymorphism, COMT Val158/108Met, affects COMT activity and dopamine availability and is associated with disturbances in cognition. The hypothesis was that PTSD subjects will have worse working memory than healthy controls and that the carriers of the COMT Met allele will show better cognitive performance compared to Val/Val carriers in PTSD and controls subjects...
December 14, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29247072/vascular-and-dopaminergic-contributors-to-mild-parkinsonian-signs-in-older-adults
#10
Andrea L Rosso, Nicolaas I Bohnen, Lenore J Launer, Howard J Aizenstein, Kristine Yaffe, Caterina Rosano
OBJECTIVE: Mild parkinsonian signs (MPS) are an underappreciated neurologic condition in older adults; we assessed associations of MPS with measures of dopaminergic (catechol-O-methyltransferase [COMT] genotype, an indicator of synaptic dopamine levels) and vascular (white matter hyperintensities [WMH], an indicator of cerebral small vessel disease) factors. METHODS: In a cohort of older adults (mean age 82.6 years [SD 2.6]; 58.0% female; 38.8% black), we assessed cross-sectional associations of WMH volume and COMT Val158Met (rs4680) genotype (n = 35 Met/Met, n = 180 Val carriers) with MPS by regression models adjusted for demographic and health characteristics...
December 15, 2017: Neurology
https://www.readbyqxmd.com/read/29231139/catechol-o-methyltransferase-cognition-and-alzheimer-s-disease
#11
Matea Nikolac Perkovic, Dubravka Svob Strac, Lucija Tudor, Marcela Konjevod, Gordana Nedic Erjavec, Nela Pivac
OBJECTIVE: Cognition is a complex trait representing a set of all mental abilities and processes related to knowledge. Although diverse brain regions are involved, most cognitive processes appear to engage cortical regions. The activity of dopaminergic neurons in prefrontal cortex represents a biological substrate underlying cognitive functions. Alzheimer's disease (AD) is the most frequent dementia associated with cognitive impairments. Cognitive impairment in AD starts slow with discrete deterioration in memory, language, thinking and reasoning, but it progresses into more severe and debilitating cognitive dysfunction...
December 11, 2017: Current Alzheimer Research
https://www.readbyqxmd.com/read/29225702/the-influence-of-dopamine-beta-hydroxylase-and-catechol-o-methyltransferase-gene-polymorphism-on-the-efficacy-of-insulin-detemir-therapy-in-patients-with-type-2-diabetes-mellitus
#12
Tomislav Bozek, Antonela Blazekovic, Matea Nikolac Perkovic, Kristina Gotovac Jercic, Aleksandra Sustar, Lea Smircic-Duvnjak, Tiago F Outeiro, Nela Pivac, Fran Borovecki
Background: Type II diabetes is an important health problem with a complex connection to obesity, leading to a broad range of cardiovascular complications. Insulin therapy often results in weight gain and does not always ensure adequate glycemic control. However, previous studies reported that insulin detemir is an efficient long-acting insulin with a weight sparing effect. The aim of this study was to determine the association of catechol O-methyltransferase (COMT) Val108/158Met and dopamine-beta-hydroxylase (DBH) 1021C/T polymorphisms with the effectiveness of insulin detemir in achieving glucose control and body weight control...
2017: Diabetology & Metabolic Syndrome
https://www.readbyqxmd.com/read/29222971/the-divergent-impact-of-catechol-o-methyltransferase-comt-val158met-genetic-polymorphisms-on-executive-function-in-adolescents-with-discrete-patterns-of-childhood-adversity
#13
Huihui Zhang, Jie Li, Bei Yang, Tao Ji, Zhouting Long, Qiquan Xing, Di Shao, Huayu Bai, Jiwei Sun, Fenglin Cao
PURPOSE: Catechol-O-methyltransferase (COMT) Val158Met functional polymorphisms play a crucial role in the development of executive function (EF), but their effect may be moderated by environmental factors such as childhood adversity. The present study aimed at testing the divergent impact of the COMT Val158Met genotype on EF in non-clinical adolescents with discrete patterns of childhood adversity. METHODS: A total of 341 participants completed the Childhood Trauma Questionnaire, the self-reported version of the Behavior Rating Inventory of Executive Function, and self-administered questionnaires on familial function...
November 22, 2017: Comprehensive Psychiatry
https://www.readbyqxmd.com/read/29222686/eeg-source-imaging-indices-of-cognitive-control-show-associations-with-dopamine-system-genes
#14
G McLoughlin, J Palmer, S Makeig, N Bigdely-Shamlo, T Banaschewski, M Laucht, D Brandeis
Cognitive or executive control is a critical mental ability, an important marker of mental illness, and among the most heritable of neurocognitive traits. Two candidate genes, catechol-O-methyltransferase (COMT) and DRD4, which both have a roles in the regulation of cortical dopamine, have been consistently associated with cognitive control. Here, we predicted that individuals with the COMT Met/Met allele would show improved response execution and inhibition as indexed by event-related potentials in a Go/NoGo task, while individuals with the DRD4 7-repeat allele would show impaired brain activity...
December 8, 2017: Brain Topography
https://www.readbyqxmd.com/read/29217536/correction-to-metabolic-disposition-of-luteolin-is-mediated-by-the-interplay-of-udp-glucuronosyltransferases-and-catechol-o-methyltransferases-in-rats
#15
(no author information available yet)
No abstract text is available yet for this article.
January 2018: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/29198511/preliminary-evidence-for-an-association-between-variants-of-the-catechol-o-methyltransferase-comt-gene-and-premature-ejaculation
#16
Patrick Jern, Ada Johansson, Jana Strohmaier, Jens Treutlein, Juhana Piha, Marcella Rietschel
BACKGROUND: Studies have suggested that dopamine plays a role in the neurobiological mechanism that triggers ejaculation, leading scientists to hypothesize that dopamine-related genetic polymorphisms could contribute to symptoms of premature ejaculation (PE). AIM: To investigate associations between dopamine receptor and catechol-O-methyltransferase (COMT; an enzyme involved in the catabolism of dopamine) gene-linked polymorphisms and PE. METHODS: PE status in patient groups was determined by clinical diagnosis performed by a physician specializing in sexual medicine...
December 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/29160620/dna-methylation-of-mb-comt-in-malaysian-schizophrenia-patients
#17
Abd Rahim Nour El Huda, Ku Zaifah Norsidah, Rahim Mohd Nabil Fikri, Mohd Noor Hanisah, Abdullah Kartini, A Talib Norlelawati
AIM: This study examined catechol-O-methyltransferase (COMT) DNA methylation in the peripheral blood of schizophrenia patients and also in healthy controls to investigate its potential use as a peripheral biomarker of schizophrenia and its relationships with the clinical variables of schizophrenia patients. METHODS: We examined the DNA methylation levels of COMT using genomic DNA from the peripheral blood of schizophrenia patients (n = 138) and healthy control participants (n = 132); all were Malaysian Malays...
November 21, 2017: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/29154367/effects-of-amphetamine-on-sensorimotor-gating-and-neurocognition-in-antipsychotic-medicated-schizophrenia-patients
#18
Neal R Swerdlow, Savita G Bhakta, Jo A Talledo, Daniel M Franz, Erica L Hughes, Brinda K Rana, Gregory A Light
Prepulse inhibition (PPI) of startle is being explored both as an indicator of target engagement for, and a biomarker predicting sensitivity to, pro-cognitive effects of drugs. We now report the effects of the pro-attentional drug, d-amphetamine, on PPI and neurocognition in antipsychotic-medicated schizophrenia patients and healthy subjects (HS) who were also tested in a targeted cognitive training (TCT) module. 44 HS and 38 schizophrenia patients completed a double-blind, placebo-controlled crossover study of the effects of a single dose of amphetamine (10 mg po) on PPI and MATRICS Consensus Cognitive Battery (MCCB) performance; TCT results were previously reported from 60 of these subjects...
November 20, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29128806/emotional-disorders-induced-by-hemopressin-and-rvd-hemopressin-%C3%AE-administration-in-rats
#19
Sheila Leone, Lucia Recinella, Annalisa Chiavaroli, Sara Martinotti, Claudio Ferrante, Adriano Mollica, Giorgia Macedonio, Azzurra Stefanucci, Szabolcs Dvorácskó, Csaba Tömböly, Luciano De Petrocellis, Michele Vacca, Luigi Brunetti, Giustino Orlando
BACKGROUND: The endocannabinoid (eCB) system plays an important role in regulating emotional disorders, and is involved, directly or indirectly, in psychiatric diseases, such as anxiety and depression. Hemopressin, a hemoglobin α chain-derived peptide, and RVD-hemopressin(α), a N-terminally extended form of hemopressin, act as antagonist/inverse agonist and negative allosteric modulator of the cannabinoid 1 (CB1) receptor, respectively. METHODS: Considering the possible involvement of these peptides on emotional behaviour, the aim of our study was to investigate the behavioural effects of a single intraperitoneal (ip) injection of hemopressin (0...
June 23, 2017: Pharmacological Reports: PR
https://www.readbyqxmd.com/read/29115391/effect-on-the-dopaminergic-metabolism-induced-by-oral-exposure-to-simazine-during-the-prepubertal-period-in-rats
#20
Xueting Li, Jia Yu, Yanping Wu, Baixiang Li
The herbicide simazine is widely used in agricultural and non-agricultural fields. Studies have shown that simazine inhibits the proliferation of dopaminergic cells and affects the developmental differentiation of dopamine neurons. However, little is known about the effects of simazine on dopaminergic metabolism. Therefore, the present study examined the effects of simazine on Sprague‑Dawley (SD) rats from weaning to puberty (40 days exposure). Simazine was administered orally to SD rats at doses of 0, 12...
October 20, 2017: International Journal of Molecular Medicine
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