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catechol-o-methyltransferase

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https://www.readbyqxmd.com/read/28205449/variations-in-comt-and-ntrk2-influence-symptom-burden-in-women-undergoing-breast-cancer-treatment
#1
Erin E Young, Debra Lynch Kelly, Insop Shim, Kyle M Baumbauer, Angela Starkweather, Debra E Lyon
Women with breast cancer frequently report distressing symptoms during and after treatment that can significantly erode quality of life (QOL). Symptom burden among women with breast cancer is of complex etiology and is likely influenced by disease, treatment, and environmental factors as well as individual genetic differences. The purpose of the present study was to examine the relationships between genetic polymorphisms within Neurotrophic tyrosine kinase receptor 1 (NTRK1), Neurotrophic tyrosine kinase receptor 2 (NTRK2), and catechol-O-methyltransferase ( COMT) and patient symptom burden of QOL, pain, fatigue, anxiety, depression, and sleep disturbance before, during, and after treatment for breast cancer in a subset of participants ( N = 51) in a randomized clinical trial of a novel symptom-management modality for women with breast cancer undergoing chemotherapy...
January 1, 2017: Biological Research for Nursing
https://www.readbyqxmd.com/read/28202261/hyperprolinemia-as-a-clue-in-the-diagnosis-of-a-patient-with-psychiatric-manifestations
#2
Marco Duarte, Joana Afonso, Ana Moreira, Diana Antunes, Cristina Ferreira, Hildeberto Correia, Margarida Marques, Sílvia Sequeira
Lately, microdeletions of the 22q region, responsible for DiGeorge syndrome or velocardiofacial syndrome, have been increasingly related to neuropsychiatric disorders including schizophrenia and bipolar disorder. These manifestations seem to be related to certain genes located in the hemideleted region such as the proline dehydrogenase (PRODH) and the catechol-o-methyltransferase (COMT) genes. We describe a teenager who started his adolescent psychiatric care presenting cognitive impairment, irritable mood and aggressive behaviour with schizophrenia-like symptoms that scored 153 in the Positive and Negative Symptoms Scale (PANSS) assessment...
February 12, 2017: Brain & Development
https://www.readbyqxmd.com/read/28195358/parkinson-s-disease-and-parkinson-s-disease-medications-have-distinct-signatures-of-the-gut-microbiome
#3
Erin M Hill-Burns, Justine W Debelius, James T Morton, William T Wissemann, Matthew R Lewis, Zachary D Wallen, Shyamal D Peddada, Stewart A Factor, Eric Molho, Cyrus P Zabetian, Rob Knight, Haydeh Payami
BACKGROUND: There is mounting evidence for a connection between the gut and Parkinson's disease (PD). Dysbiosis of gut microbiota could explain several features of PD. OBJECTIVE: The objective of this study was to determine if PD involves dysbiosis of gut microbiome, disentangle effects of confounders, and identify candidate taxa and functional pathways to guide research. METHODS: A total of 197 PD cases and 130 controls were studied. Microbial composition was determined by 16S rRNA gene sequencing of DNA extracted from stool...
February 14, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28195063/generation-of-membrane-bound-catechol-o-methyl-transferase-deficient-mice-with-disctinct-sex-dependent-behavioral-phenotype
#4
A Tammimaki, A Aonurm-Helm, F P Zhang, M Poutanen, G Duran-Torres, A Garcia-Horsman, P T Mannisto
Catechol-O-methyltransferase (COMT) has two isoforms: soluble (S-COMT), which resides in the cytoplasm, and membrane-bound (MB-MT), anchored to intracellular membranes. COMT is involved in the O-methylation of L-DOPA, dopamine and other catechols. The exact role of MB-COMT is still mostly unclear. We wanted to create a novel genetically modified mouse model that specifically lacks MB-COMT activity and to study their behavioral phenotype. MB-COMT knock-in mutant mice were generated by introducing two point mutations in exon 2 of the Comt gene (ATGCTG->GAGCTC disabling the function of the P2 promoter and allowing only the P1-regulated S-COMT transcription...
December 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28182962/an-observational-study-of-the-impact-of-genetic-testing-for-pain-perception-in-the-clinical-management-of-chronic-non-cancer-pain
#5
Maneesh Sharma, Svetlana Kantorovich, Chee Lee, Natasha Anand, John Blanchard, Eric T Fung, Brian Meshkin, Ashley Brenton, Steven Richeimer
OBJECTIVE: Pain levels are a key metric in clinical care. However, the assessment of pain is limited to basic questionnaires and physician interpretation, which yield subjective data. Genetic markers of pain sensitivity, such as single nucleotide polymorphisms in the catechol-O-methyltransferase gene, have been shown to be associated with pain perception and have been used to provide objective information about a patient's pain. The goal of this study was to determine if physician treatment adjustments based on genetic tests of pain perception resulted in improved outcomes for patients...
January 30, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28131014/executive-function-performance-and-change-in-aging-is-predicted-by-apolipoprotein-e-intensified-by-catechol-o-methyltransferase-and-brain-derived-neurotrophic-factor-and-moderated-by-age-and-lifestyle
#6
Shraddha Sapkota, Lars Bäckman, Roger A Dixon
Recent studies have reported several genetic, health, and aging interaction effects in predicting cognitive performance and change. We used an accelerated longitudinal design to examine interactions among genetic, lifestyle, and aging for executive function (EF) in non-demented older adults (n = 634; age range = 53-95 years). The polymorphisms were apolipoprotein E (APOE), catechol-O-methyltransferase (COMT), and brain-derived neurotrophic factor (BDNF). We tested (1) independent and additive effects of APOE, COMT, and BDNF and (2) APOE effect modification for COMT + BDNF, on EF performance and 9-year change as separated by age and lifestyle activities...
January 3, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28123288/spotlight-on-opicapone-as-an-adjunct-to-levodopa-in-parkinson-s-disease-design-development-and-potential-place-in-therapy
#7
REVIEW
Ádám Annus, László Vécsei
Parkinson's disease (PD) is a progressive, chronic, neurodegenerative disease characterized by rigidity, tremor, bradykinesia and postural instability secondary to dopaminergic deficit in the nigrostriatal system. Currently, disease-modifying therapies are not available, and levodopa (LD) treatment remains the gold standard for controlling motor and nonmotor symptoms of the disease. LD is extensively and rapidly metabolized by peripheral enzymes, namely, aromatic amino acid decarboxylase and catechol-O-methyltransferase (COMT)...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28119508/hierarchical-prediction-errors-in-midbrain-and-septum-during-social-learning
#8
Andreea O Diaconescu, Christoph Mathys, Lilian A E Weber, Lars Kasper, Jan Mauer, Klaas E Stephan
Social learning is fundamental to human interactions, yet its computational and physiological mechanisms are not well understood. One prominent open question concerns the role of neuromodulatory transmitters. We combined fMRI, computational modelling, and genetics to address this question in two separate samples (N=35, N=47). Participants played a game requiring inference on an advisor's intentions whose motivation to help or mislead changed over time. Our analyses suggest that hierarchically structured belief updates about current advice validity and the adviser's trustworthiness, respectively, depend on different neuromodulatory systems...
January 24, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28100326/-feeding-difficulty-and-developmental-delay-for-8-months-and-nystagmus-for-4-months-in-an-infant
#9
Jie Zhu, Fei Yu
Aromatic L-amino acid decarboxylase (AADC) deficiency is a rare autosomal recessive hereditary disease and is a congenital metabolic disorder of neurotransmitter biosynthesis. It is mainly manifested as hypotonia, oculogyric crisis, autonomic dysfunction, and developmental delay. This article reports a boy manifested as delayed motor development, hypotonia, and oculogyric crisis. Gene screening for metabolic disorders revealed new compound heterozygous mutations, c.1063dupA (p.I355fs) and c.250A>C (p.S84R), in the exon of DDC gene...
January 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28096880/genetic-polymorphism-of-1019c-g-rs6295-promoter-of-serotonin-1a-receptor-and-catechol-o-methyltransferase-in-panic-disorder
#10
Takashi Watanabe, Shin Ishiguro, Akiko Aoki, Mikito Ueda, Yuki Hayashi, Kazufumi Akiyama, Kazuko Kato, Kazutaka Shimoda
OBJECTIVE: Family and twin studies have suggested genetic liability for panic disorder (PD) and therefore we sought to determine the role of noradrenergic and serotonergic candidate genes for susceptibility for PD in a Japanese population. METHODS: In this age- and gender-matched case-control study involving 119 PD patients and 119 healthy controls, we examined the genotype distributions and allele frequencies of the serotonin transporter gene linked polymorphic region (5-HTTLPR), -1019C/G (rs6295) promoter polymorphism of the serotonin receptor 1A (5-HT1A), and catechol-O-methyltransferase (COMT) gene polymorphism (rs4680) and their association with PD...
January 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28089731/investigation-of-polymorphisms-in-genes-involved-in-estrogen-metabolism-in-menstrual-migraine
#11
Heidi G Sutherland, Morgane Champion, Amelie Plays, Shani Stuart, Larisa M Haupt, Alison Frith, E Anne MacGregor, Lyn R Griffiths
Migraine is a common, disabling headache disorder, which is influenced by multiple genes and environmental triggers. After puberty, the prevalence of migraine in women is three times higher than in men and >50% of females suffering from migraine report a menstrual association, suggesting hormonal fluctuations can influence the risk of migraine attacks. It has been hypothesized that the drop in estrogen during menses is an important trigger for menstrual migraine. Catechol-O-methyltransferase (COMT) and Cytochrome P450 (CYP) enzymes are involved in estrogen synthesis and metabolism...
April 5, 2017: Gene
https://www.readbyqxmd.com/read/28088578/the-effect-of-long-term-hindlimb-unloading-on-the-expression-of-risk-neurogenes-encoding-elements-of-serotonin-dopaminergic-systems-and-apoptosis-comparison-with-the-effect-of-actual-spaceflight-on-mouse-brain
#12
E A Kulikova, V A Kulikov, N A Sinyakova, A V Kulikov, N K Popova
The study of spaceflight effects on the brain is technically complex concern; complicated by the problem of applying an adequate ground model. The most-widely used experimental model to study the effect of microgravity is the tail-suspension hindlimb unloading model; however, its compliance with the effect of actual spaceflight on the brain is still unclear. We evaluated the effect of one month hindlimb unloading on the expression of genes related to the brain neuroplasticity-brain neutotrophic factors (Gdnf, Cdnf), apoptotic factors (Bcl-xl, Bax), serotonin- and dopaminergic systems (5-HT2A, Maoa, Maob, Th, D1r, Comt), and compared the results with the data obtained on mice that spent one month in spaceflight on Russian biosatellite Bion-M1...
January 12, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28074437/aberrant-endometrial-dna-methylome-of-homeobox-a10-and-catechol-o-methyltransferase-in-endometriosis
#13
Fei Ji, Xinhua Yang, Yan He, Hui Wang, Aixingzi Aili, Yan Ding
PURPOSE: Differential methylation of both HOXA10 and catechol-O-methyltransferase (COMT) has been reported in different endometrium disorders, and the two genes are linked through the estrogen pathway. The current study investigates the DNA methylation of HOXA10 and COMT in ectopic and eutopic endometrial tissues and its correlation with and the occurrence of endometriosis in women from Xinjiang province in China. METHODS: In the current study, 120 patients with endometriosis were recruited from our hospital between January 2011 and June 2014...
January 10, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28068092/systematic-quantum-mechanical-region-determination-in-qm-mm-simulation
#14
Maria Karelina, Heather J Kulik
Hybrid quantum mechanical-molecular mechanical (QM/MM) simulations are widely used in enzyme simulation. Over ten convergence studies of QM/MM methods have revealed over the past several years that key energetic and structural properties approach asymptotic limits with only very large (ca. 500-1000 atom) QM regions. This slow convergence has been observed to be due in part to significant charge transfer between the core active site and the surrounding protein environment, which cannot be addressed by improvement of MM force fields or the embedding method employed within QM/MM...
January 23, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28066708/right-inferior-frontal-cortex-activity-correlates-with-tolcapone-responsivity-in-problem-and-pathological-gamblers
#15
Andrew S Kayser, Taylor Vega, Dawn Weinstein, Jan Peters, Jennifer M Mitchell
Failures of self-regulation in problem and pathological gambling (PPG) are thought to emerge from failures of top-down control, reflected neurophysiologically in a reduced capacity of prefrontal cortex to influence activity within subcortical structures. In patients with addictions, these impairments have been argued to alter evaluation of reward within dopaminergic neuromodulatory systems. Previously we demonstrated that augmenting dopamine tone in frontal cortex via use of tolcapone, an inhibitor of the dopamine-degrading enzyme catechol-O-methyltransferase (COMT), reduced delay discounting, a measure of impulsivity, in healthy subjects...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28060209/catechol-o-methyltransferase-genotypes-and-parenting-influence-on-long-term-executive-functioning-after-moderate-to-severe-early-childhood-traumatic-brain-injury-an-exploratory-study
#16
Brad G Kurowski, Amery Treble-Barna, Huaiyu Zang, Nanhua Zhang, Lisa J Martin, Keith Owen Yeates, H Gerry Taylor, Shari L Wade
OBJECTIVES: To examine catechol-O-methyltransferase (COMT) rs4680 genotypes as moderators of the effects of parenting style on postinjury changes in parent behavior ratings of executive dysfunction following moderate to severe early childhood traumatic brain injury. SETTING: Research was conducted in an outpatient setting. PARTICIPANTS: Participants included children admitted to hospital with moderate to severe traumatic brain injury (n = 55) or orthopedic injuries (n = 70) between ages 3 and 7 years...
January 5, 2017: Journal of Head Trauma Rehabilitation
https://www.readbyqxmd.com/read/28049082/catechol-o-methyltransferase-val-108-158-met-polymorphism-affects-fronto-limbic-connectivity-during-emotional-processing-in-bipolar-disorder
#17
B Vai, M Riberto, S Poletti, I Bollettini, C Lorenzi, C Colombo, F Benedetti
Catechol-O-methyltransferase (COMT) inactivates catecholamines, Val/Val genotype was associated to an increased amygdala (Amy) response to negative stimuli and can influence the symptoms severity and the outcome of bipolar disorder, probably mediated by the COMT polymorphism (rs4680) interaction between cortical and subcortical dopaminergic neurotransmission. The aim of this study is to explore how rs4680 and implicit emotional processing of negative emotional stimuli could interact in affecting the Amy connectivity in bipolar depression...
December 30, 2016: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28032000/reduced-brain-activation-during-inhibitory-control-in-children-with-comt-val-val-genotype
#18
Lora M Cope, Jillian E Hardee, Mary E Soules, Margit Burmeister, Robert A Zucker, Mary M Heitzeg
INTRODUCTION: Behavioral undercontrol is a well-established risk factor for substance use disorder, identifiable at an early age well before the onset of substance use. However, the biological mechanistic structure underlying the behavioral undercontrol/substance use relationship is not well understood. The enzyme catechol O-methyltransferase (COMT) catabolizes dopamine and norepinephrine in the prefrontal cortex and striatum, brain regions involved in behavioral control. The goal of this work was to investigate the association between genetic variation in COMT functioning and fronto-striatal brain functioning during successful inhibitory control, a critical aspect of behavioral control...
December 2016: Brain and Behavior
https://www.readbyqxmd.com/read/28031430/metabolic-disposition-of-luteolin-is-mediated-by-the-interplay-of-udp-glucuronosyltransferases-and-catechol-o-methyltransferases-in-rats
#19
Liping Wang, Qingwei Chen, Lijun Zhu, Qiang Li, Xuejun Zeng, Linlin Lu, Ming Hu, Xinchun Wang, Zhongqiu Liu
Luteolin partialy exerts its biological effects via its metabolites catalyzed by UDP-glucuronosyltransferases (UGTs) and catechol-O-methyltransferases (COMTs). However, the interplay of UGTs and COMTs in mediating luteolin disposition has not been well clarified. In this study, we investigated the glucuronidation and methylation pathways of luteolin mediated by the interplay of UGTs and COMTs in vivo and in vitro A total of nine luteolin metabolites were detected in rat plasma and bile by liquid chromatography - tandem mass spectrometry, namely, three glucuronides, two methylated metabolites, and four methylated glucuronides...
December 28, 2016: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/28027332/opicapone-as-adjunct-to-levodopa-therapy-in-patients-with-parkinson-disease-and-motor-fluctuations-a-randomized-clinical-trial
#20
Andrew J Lees, Joaquim Ferreira, Olivier Rascol, Werner Poewe, José-Francisco Rocha, Michelle McCrory, Patricio Soares-da-Silva
Importance: Catechol O-methyltransferase (COMT) inhibitors are an established treatment for end-of-dose motor fluctuations associated with levodopa therapy in patients with Parkinson disease (PD). Current COMT inhibitors carry a high risk for toxic effects to hepatic cells or show moderate improvement. Opicapone was designed to be effective without the adverse effects. Objective: To evaluate the efficacy and safety of 25- and 50-mg/d dosages of opicapone compared with placebo as adjunct to levodopa therapy in patients with PD experiencing end-of-dose motor fluctuations...
February 1, 2017: JAMA Neurology
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