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catechol-o-methyltransferase

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https://www.readbyqxmd.com/read/28734868/a-single-and-multiple-dose-study-to-investigate-the-pharmacokinetics-and-pharmacodynamics-of-opicapone-a-novel-comt-inhibitor-in-rat
#1
Daniela Gonçalves, Gilberto Alves, Ana Fortuna, Maria João Bonifácio, Patrício Soares-da-Silva, Amílcar Falcão
Opicapone is a novel catechol-O-methyltransferase (COMT) inhibitor that emerged to fulfil the need of a safer and more efficacious COMT inhibitor. The present study was carried out in order to assess and compare the pharmacokinetics and pharmacodynamics (COMT inhibition) of opicapone after single and multiple oral administrations (30 mg/kg) to Wistar rats. For this purpose, at predefined time points up to 72 h post-dosing, blood, liver and kidneys were collected and, then, the concentrations of opicapone and its active metabolite (BIA 9-1079) were determined in plasma and in liver and kidney tissues, as well as the erythrocyte, liver and kidney COMT activity...
July 19, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28728097/nonlinear-modulation-of-interacting-between-comt-and-depression-on-brain-function
#2
L Gong, C He, Y Yin, Q Ye, F Bai, Y Yuan, H Zhang, L Lv, H Zhang, Z Zhang, C Xie
BACKGROUND: The catechol-O-methyltransferase (COMT) gene is related to dopamine degradation and has been suggested to be involved in the pathogenesis of major depressive disorder (MDD). However, how this gene affects brain function properties in MDD is still unclear. METHODS: Fifty patients with MDD and 35 cognitively normal participants underwent a resting-state functional magnetic resonance imaging scan. A voxelwise and data-drive global functional connectivity density (gFCD) analysis was used to investigate the main effects and the interactions of disease states and COMT rs4680 gene polymorphism on brain function...
June 9, 2017: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28710019/effects-of-human-blood-levels-of-two-pah-mixtures-on-the-ahr-signalling-activation-pathway-and-cyp1a1-and-comt-target-genes-in-granulosa-non-tumor-and-granulosa-tumor-cell-lines
#3
Karolina Zajda, Anna Ptak, Agnieszka Rak, Elżbieta Fiedor, Adam Grochowalski, Tomasz Milewicz, Ewa L Gregoraszczuk
Epidemiological studies have shown a link between problems with offspring of couples living in a contaminated environment in comparison to those who live in an uncontaminated environment. We measured the concentrations of 16 priority polycyclic aromatic hydrocarbons (PAHs) in maternal and cord blood. To explore the mechanism of the effects of PAH mixtures on nonluteinized granulosa cells (HGrC1) and granulosa tumor cells (COV434), as well as cell proliferation and apoptosis, we investigated the effect of PAH mixtures on the expression of the aryl hydrocarbon receptor (AHR), aryl hydrocarbon receptor nuclear translocator (ARNT) and aryl hydrocarbon receptor repressor (AHRR) genes, as well as the expression and activity of target genes cytochrome P450 1A1 (CYP1A1) and catechol-O-methyltransferase (COMT)...
July 11, 2017: Toxicology
https://www.readbyqxmd.com/read/28707072/catechol-o-methyltransferase-val158met-polymorphism-on-striatum-structural-covariance-networks-in-alzheimer-s-disease
#4
Chiung-Chih Chang, Shih-Jen Tsai, Nai-Ching Chen, Chi-Wei Huang, Shih-Wei Hsu, Ya-Ting Chang, Mu-En Liu, Wen-Neng Chang, Wan-Chen Tsai, Chen-Chang Lee
The catechol-O-methyltransferase enzyme metabolizes dopamine in the prefrontal axis, and its genetic polymorphism (rs4680; Val158Met) is a known determinant of dopamine signaling. In this study, we investigated the possible structural covariance networks that may be modulated by this functional polymorphism in patients with Alzheimer's disease. Structural covariance networks were constructed by 3D T1 magnetic resonance imaging. The patients were divided into two groups: Met-carriers (n = 91) and Val-homozygotes (n = 101)...
July 13, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28690202/the-impact-of-methylphenidate-and-its-enantiomers-on-dopamine-synthesis-and-metabolism-in-vitro
#5
Jasmin Bartl, Ferruccio Palazzesi, Michele Parrinello, Leif Hommers, Peter Riederer, Susanne Walitza, Edna Grünblatt
Methylphenidate (MPH), a psychostimulant, is an effective first-line treatment for the symptoms associated with Attention-Deficit/Hyperactivity Disorder (ADHD). Although most MPH formulations are composed of the racemic 1:1 mixture of the two enantiomers (d- and l-threo), converging lines of evidence indicate that d-threo MPH seems to be superior to the l-isomer. We aimed to investigate whether MPH racemic mixture or pure enantiomers influence the enzyme activity of tyrosine hydroxylase (TH), monoamine oxidase B (MAO-B), catechol-O-methyltransferase (COMT), and aldehyde dehydrogenase (ALDH) in vitro in homogenates of rat PC12 cells incubated with racemic, d- and l-threo MPH (1nM up to 100μM), or a vehicle for control...
July 8, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28687733/catechol-o-methyltransferase-polymorphism-is-associated-with-the-cortico-cerebellar-functional-connectivity-of-executive-function-in-children-with-attention-deficit-hyperactivity-disorder
#6
Yoshifumi Mizuno, Minyoung Jung, Takashi X Fujisawa, Shinichiro Takiguchi, Koji Shimada, Daisuke N Saito, Hirotaka Kosaka, Akemi Tomoda
The cerebellum, although traditionally considered a motor structure, has been increasingly recognized to play a role in regulating executive function, the dysfunction of which is a factor in attention-deficit/hyperactivity disorder (ADHD). Additionally, catechol-O-methyltransferase (COMT) polymorphism has been reported to be associated with executive function. We examined whether the cortico-cerebellar executive function network is altered in children with ADHD and whether COMT polymorphism is associated with the altered network...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28676589/association-between-catechol-o-methyltransferase-val158met-158g-a-polymorphism-and-suicide-susceptibility-a-meta-analysis
#7
Tahereh Sadeghiyeh, Fatemeh Hosseini Biouki, Mahta Mazaheri, Masoud Zare-Shehneh, Hossein Neamatzadeh, Zahra Poursharif
BACKGROUND: Common functional Val158Met polymorphism in the Catechol-O-methyltransferase (COMT) gene may have an impact on an individual's susceptibility to suicide, but individually published results are inconclusive. Therefore, we performed this meta-analysis to provide a more precise estimation of the association between COMT 158G/A (COMT Val158Met) polymorphism and suicide susceptibility. STUDY DESIGN: A cross-sectional study. METHODS: This systematic review and meta-analysis is a comprehensive literature search of PubMed, Scopus, Web of Science and Google Scholar databases was conducted on case-control studies published up to Mar 2017...
June 24, 2017: Journal of Research in Health Sciences
https://www.readbyqxmd.com/read/28665765/the-association-between-comt-rs4680-and-5-httlpr-genotypes-and-concussion-history-in-south-african-rugby-union-players
#8
Sarah Mc Fie, Shameemah Abrahams, Jon Patricios, Jason Suter, Michael Posthumus, Alison V September
The objective was to investigate the relationship between Catechol-O-methyltransferase (COMT) rs4680 and serotonin-transporter-linked polymorphic region (5-HTTLPR) genotypes with concussion history and personality traits. Rugby players ("all levels": n = 303), from high schools ("junior", n = 137), senior amateur, and professional teams ("senior", n = 166), completed a self-reported concussion history questionnaire, Cloninger's Tridimensional Personality Questionnaire, and donated a DNA sample. Participants were allocated into control (non-concussed, n = 140), case (all) (previous suspected or diagnosed concussions, n = 163), or case (diagnosed only) (previous diagnosed concussion, n = 140) groups...
June 30, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28648906/comt-genotype-is-differentially-associated-with-single-trial-variability-of-erps-as-a-function-of-memory-type
#9
Hadiseh Nowparast Rostami, Christopher W N Saville, Christoph Klein, Guang Ouyang, Werner Sommer, Changsong Zhou, Andrea Hildebrandt
Previous research on the association between intra-subject variability (ISV) in reaction times (RTs) and the Val(158)Met polymorphism of the catechol-o-methyltransferase gene (COMT; rs4680) has yielded mixed results. The present study compared the associations between COMT genotype and ISV in P3b latency measured during working and secondary memory tasks using residue iteration decomposition (RIDE) of single trial latencies. We compared the outcome of the present analyses with a previous analysis of the same data (N=70, n-back tasks) using an alternative single-trial method...
June 23, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28640434/catechol-o-methyltransferase-genotype-and-gait-speed-changes-over-10-years-in-older-adults
#10
Andrea L Metti, Caterina Rosano, Robert Boudreau, Robyn Massa, Kristine Yaffe, Suzanne Satterfield, Tamara Harris, Andrea L Rosso
OBJECTIVES: To determine the association between catechol-O-methyltransferase (COMT) genotype and 6-m walk time and to determine whether these associations are quadratic in nature, similar to previously reported U-shaped associations between dopamine and gait and cognition. DESIGN: Prospective cohort study. SETTING: Health, Aging and Body Composition Study. PARTICIPANTS: Black (n = 850) and white (n = 1,352) men and women with a mean age of 73...
June 22, 2017: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/28637770/analgesia-and-opioids-a-pharmacogenetics-shortlist-for-implementation-in-clinical-practice
#11
REVIEW
Maja Matic, Saskia N de Wildt, Dick Tibboel, Ron H N van Schaik
BACKGROUND: The use of opioids to alleviate pain is complicated by the risk of severe adverse events and the large variability in dose requirements. Pharmacogenetics (PGx) could possibly be used to tailor pain medication based on an individual's genetic background. Many potential genetic markers have been described, and the importance of genetic predisposition in opioid efficacy and toxicity has been demonstrated in knockout mouse models and human twin studies. Such predictors are especially of value for neonates and young children, in whom the assessment of efficacy or side effects is complicated by the inability of the patient to communicate this properly...
July 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/28635556/executive-control-in-schizophrenia-a-preliminary-study-on-the-moderating-role-of-comt-val158met-for-comorbid-alcohol-and-substance-use-disorders
#12
Giuseppe Carrà, Gabriella Nicolini, Cristina Crocamo, Annamaria Lax, Francesca Amidani, Francesco Bartoli, Filippo Castellano, Alessia Chiorazzi, Giulia Gamba, Costanza Papagno, Massimo Clerici
BACKGROUND: A functional polymorphism in the catechol-O-methyltransferase (COMT) gene (Val158Met) appears to influence cognition in people with alcohol/substance use disorders (AUD/SUD) and in those with psychosis. METHODS: To explore the potential moderating effect of these factors, a cross-sectional study was conducted, randomly recruiting subjects with DSM-IV diagnosis of schizophrenia. AUD/SUD was rigorously assessed, as well as COMT Val158Met polymorphism. Executive control functioning was measured using the Intra-Extra Dimensional Set Shift (IED)...
February 14, 2017: Nordic Journal of Psychiatry
https://www.readbyqxmd.com/read/28630452/remote-memories-are-enhanced-by-comt-activity-through-dysregulation-of-the-endocannabinoid-system-in-the-prefrontal-cortex
#13
D Scheggia, E Zamberletti, N Realini, M Mereu, G Contarini, V Ferretti, F Managò, G Margiani, R Brunoro, T Rubino, M A De Luca, D Piomelli, D Parolaro, F Papaleo
The prefrontal cortex (PFC) is a crucial hub for the flexible modulation of recent memories (executive functions) as well as for the stable organization of remote memories. Dopamine in the PFC is implicated in both these processes and genetic variants affecting its neurotransmission might control the unique balance between cognitive stability and flexibility present in each individual. Functional genetic variants in the catechol-O-methyltransferase (COMT) gene result in a different catabolism of dopamine in the PFC...
June 20, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28629779/are-dopaminergic-genotypes-risk-factors-for-eating-behavior-and-obesity-in-adults
#14
Orcun Avsar, Aysegul Kuskucu, Seda Sancak, Ece Genc
Dopamine (DA) is the main modulator of the brain reward system and significantly regulates food intake. The idea that obesity is a neurobiological disease rather than a metabolic disorder, is the basis of the study. Changes in dopamine neurotransmission affect the brain reward system in a direct way. Furthermore, changes in the reward system influence the eating behavior in human. The enzymes monoamine oxidase A (MAOA) and catechol-O-methyltransferase (COMT) terminate the DA function by metabolizing it. In our study, the control group which included 214 individuals and 234 subjects with obesity were investigated for MAOA-u VNTR and COMT (rs4680) polymorphisms...
July 27, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28625321/catechol-o-methyltransferase-gene-polymorphism-val158met-and-development-of-pre-eclampsia
#15
Ali Taravati, Fatemeh Tohidi, Mehrnaz Moniri, Kasra Kamali
OBJECTIVES: Catechol-O-methyltransferase (COMT) is a key enzyme in degradation pathways of estrogens and catecholamines. The present meta-analysis was done to elucidate the association of COMT Val158Met polymorphism with pre-eclampsia among pregnant women. METHODS: A literature search was conducted in electronic databases including PubMed, Scopus, Elsevier, Springer and Google Scholar to find eligible studies. The pooled odds ratios (ORs) with 95% confidence intervals were calculated under dominant, recessive, co-dominant, and allelic models...
February 2017: Archives of Medical Research
https://www.readbyqxmd.com/read/28616971/lack-of-cell-proliferative-and-tumorigenic-effects-of-4-hydroxyestradiol-in-the-anterior-pituitary-of-rats-role-of-ultrarapid-o-methylation-catalyzed-by-pituitary-membrane-bound-catechol-o-methyltransferase
#16
Pan Wang, Laura H Mills, Ji-Hoon Song, Jina Yu, Bao-Ting Zhu
In animal models, estrogens are complete carcinogens in certain target sites. 4-Hydroxyestradiol (4-OH-E2), an endogenous metabolite of 17β-estradiol (E2), is known to have prominent estrogenic activity plus potential genotoxicity and mutagenicity. We report here our finding that 4-OH-E2 does not induce pituitary tumors in ACI female rats, whereas E2 produces 100% pituitary tumor incidence. To probe the mechanism, we conducted a short-term animal experiment to compare the proliferative effect of 4-OH-E2 in several organs...
June 15, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28614354/maternal-prenatal-anxiety-and-child-comt-genotype-predict-working-memory-and-symptoms-of-adhd
#17
Kieran J O'Donnell, Vivette Glover, Jari Lahti, Marius Lahti, Rachel D Edgar, Katri Räikkönen, Thomas G O'Connor
Maternal prenatal anxiety is an important risk factor for altered child neurodevelopment but there is uncertainty concerning the biological mechanisms involved and sources of individual differences in children's responses. We sought to determine the role of functional genetic variation in COMT, which encodes catechol-O-methyltransferase, in the association between maternal prenatal anxiety and child symptoms of ADHD and working memory. We used the prospectively-designed ALSPAC cohort (n = 6,969) for our primary data analyses followed by replication analyses in the PREDO cohort (n = 425)...
2017: PloS One
https://www.readbyqxmd.com/read/28610409/impact-of-catechol-o-methyltransferase-val-158met-rs4680-polymorphism-on-breast-cancer-susceptibility-in-asian-population
#18
Vandana Rai, Upendra Yadav, Pradeep Kumar
Background: Catechol-O-methyltransferase (COMT) is an important estrogen-metabolizing enzyme. Numerous case-control studies have evaluated the role COMT Val 158Met (rs4680;472G->A) polymorphism in the risk of breast cancer and provided inconclusive results, hence present meta-analysis was designed to get a more reliable assessment in Asian population. Methods: A total of 26 articles were identified through a search of four electronic databases- PubMed, Google Scholar, Science Direct and Springer link, up to March, 2016...
May 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28608575/association-between-comt-val158met-and-psychiatric-disorders-a-comprehensive-meta-analysis
#19
Steven Taylor
Catechol-O-methyltransferase (COMT) Val158Met is widely regarded as potentially important for understanding the genetic etiology of many different psychiatric disorders. The present study appears to be the first comprehensive meta-analysis of COMT genetic association studies to cover all psychiatric disorders for which there were available data, published in any language, and with an emphasis on investigating disorder subtypes (defined clinically or by demographic or other variables). Studies were included if they reported one or more datasets (i...
June 13, 2017: American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics
https://www.readbyqxmd.com/read/28608189/effect-of-catechol-o-methyltransferase-val158met-polymorphism-on-resting-state-brain-default-mode-network-after-acupuncture-stimulation
#20
Xuejuan Yang, Jie Gong, Lingmin Jin, Lin Liu, Jinbo Sun, Wei Qin
The effects of acupuncture can be characterized by clear individual differences. Several revealing studies suggest an underlying role of inherited genetic factor in interindividual variability in response to acupuncture treatment. It remains unclear, however, if the modulation of acupuncture on resting brain function is influenced by genetic factors. Catechol-o-methyltransferase (COMT) Val158Met polymorphism has been shown to regulate the resting brain network, especially in the default mode network (DMN), which is a target area that responds to acupuncture stimulation...
June 13, 2017: Brain Imaging and Behavior
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