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Michael O'Brien

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https://www.readbyqxmd.com/read/29330481/fdxr-is-a-biomarker-of-radiation-exposure-in-vivo
#1
Gráinne O'Brien, Lourdes Cruz-Garcia, Matthäus Majewski, Jakub Grepl, Michael Abend, Matthias Port, Aleš Tichý, Igor Sirak, Andrea Malkova, Ellen Donovan, Lone Gothard, Sue Boyle, Navita Somaiah, Elizabeth Ainsbury, Lucyna Ponge, Krzysztof Slosarek, Leszek Miszczyk, Piotr Widlak, Edward Green, Neel Patel, Mahesh Kudari, Fergus Gleeson, Volodymyr Vinnikov, Viktor Starenkiy, Sergii Artiukh, Leonid Vasyliev, Azfar Zaman, Christophe Badie
Previous investigations in gene expression changes in blood after radiation exposure have highlighted its potential to provide biomarkers of exposure. Here, FDXR transcriptional changes in blood were investigated in humans undergoing a range of external radiation exposure procedures covering several orders of magnitude (cardiac fluoroscopy, diagnostic computed tomography (CT)) and treatments (total body and local radiotherapy). Moreover, a method was developed to assess the dose to the blood using physical exposure parameters...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29320925/self-perceived-and-actual-motor-competence-in-young-british-children
#2
Michael J Duncan, Victoria Jones, Wesley O'Brien, Lisa M Barnett, Emma L J Eyre
Children's perception of their own motor competence is an important correlate of their actual motor competence. The current study is the first to examine this association in British children and the first to use both product and process measures of actual motor competence. A total of 258 children (139 boys and 119 girls; aged 4 to 7 years, Mean = 5.6, SD = .96) completed measures of self-perceived motor competence using the Pictorial Scale for Perceived Movement Competence in Young Children. Children were classified as "Low," "Medium," or "High" perceived competence based on tertile analysis...
January 1, 2018: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/29310558/surgical-palliation-of-right-aortic-arch-with-an-isolated-innominate-artery-from-the-left-ductus-arteriosus
#3
Matthew C Schwartz, Kamal Pourmoghadam, Michael O'Brien, Craig E Fleishman, William DeCampli
A right aortic arch with an isolated left innominate artery from the left patent ductus arteriosus is a rare arch anomaly, and establishing continuity between the innominate artery and aorta can be challenging. We describe repair of this lesion in a three-week-old male using an autologous pedicle flap of ascending aorta as well as a homograft patch as the roof to recreate continuity between the aorta and left innominate artery.
January 2018: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/29306668/a-prognostic-model-of-alzheimer-s-disease-relying-on-multiple-longitudinal-measures-and-time-to-event-data
#4
Kan Li, Richard O'Brien, Michael Lutz, Sheng Luo
INTRODUCTION: Characterizing progression in Alzheimer's disease is critically important for early detection and targeted treatment. The objective was to develop a prognostic model, based on multivariate longitudinal markers, for predicting progression-free survival in patients with mild cognitive impairment. METHODS: The information contained in multiple longitudinal markers was extracted using multivariate functional principal components analysis and used as predictors in the Cox regression models...
January 3, 2018: Alzheimer's & Dementia: the Journal of the Alzheimer's Association
https://www.readbyqxmd.com/read/29289076/limitations-on-estimation-of-effective-scatterer-diameters
#5
Yang Zhu, Aiguo Han, William D O'Brien, Michael L Oelze, Michael F Insana
The influence of spatial diversity in acoustic scattering properties on estimates of the effective scatterer diameter (ESD) applied to soft biological tissues is investigated. This study is based on two-dimensional simulations of scattering media, beginning with random distributions of simple disk structures where all scattering features are known exactly. It concludes with an analysis of histology maps from healthy and fatty rabbit liver. Further, the liver histology is decomposed using an orthonormal basis to separate acoustic scattering at various spatial scales and observe how it influences ESD estimates...
December 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29288229/genetic-variation-in-cfh-predicts-phenytoin-induced-maculopapular-exanthema-in-european-descent-patients
#6
Mark McCormack, Hongsheng Gui, Andrés Ingason, Doug Speed, Galen E B Wright, Eunice J Zhang, Rodrigo Secolin, Clarissa Yasuda, Maxwell Kwok, Stefan Wolking, Felicitas Becker, Sarah Rau, Andreja Avbersek, Kristin Heggeli, Costin Leu, Chantal Depondt, Graeme J Sills, Anthony G Marson, Pauls Auce, Martin J Brodie, Ben Francis, Michael R Johnson, Bobby P C Koeleman, Pasquale Striano, Antonietta Coppola, Federico Zara, Wolfram S Kunz, Josemir W Sander, Holger Lerche, Karl Martin Klein, Sarah Weckhuysen, Martin Krenn, Lárus J Gudmundsson, Kári Stefánsson, Roland Krause, Neil Shear, Colin J D Ross, Norman Delanty, Munir Pirmohamed, Bruce C Carleton, Fernando Cendes, Iscia Lopes-Cendes, Wei-Ping Liao, Terence J O'Brien, Sanjay M Sisodiya, Stacey Cherny, Patrick Kwan, Larry Baum, Gianpiero L Cavalleri
OBJECTIVE: To characterize, among European and Han Chinese populations, the genetic predictors of maculopapular exanthema (MPE), a cutaneous adverse drug reaction common to antiepileptic drugs. METHODS: We conducted a case-control genome-wide association study of autosomal genotypes, including Class I and II human leukocyte antigen (HLA) alleles, in 323 cases and 1,321 drug-tolerant controls from epilepsy cohorts of northern European and Han Chinese descent. Results from each cohort were meta-analyzed...
December 29, 2017: Neurology
https://www.readbyqxmd.com/read/29282272/our-health-counts-toronto-using-respondent-driven-sampling-to-unmask-census-undercounts-of-an-urban-indigenous-population-in-toronto-canada
#7
Michael A Rotondi, Patricia O'Campo, Kristen O'Brien, Michelle Firestone, Sara H Wolfe, Cheryllee Bourgeois, Janet K Smylie
OBJECTIVES: To provide evidence of the magnitude of census undercounts of 'hard-to-reach' subpopulations and to improve estimation of the size of the urban indigenous population in Toronto, Canada, using respondent-driven sampling (RDS). DESIGN: Respondent-driven sampling. SETTING: The study took place in the urban indigenous community in Toronto, Canada. Three locations within the city were used to recruit study participants. PARTICIPANTS: 908 adult participants (15+) who self-identified as indigenous (First Nation, Inuit or Métis) and lived in the city of Toronto...
December 26, 2017: BMJ Open
https://www.readbyqxmd.com/read/29230164/a-sub-millimeter-inductively-powered-neural-stimulator
#8
Daniel K Freeman, Jonathan M O'Brien, Parshant Kumar, Brian Daniels, Reed A Irion, Louis Shraytah, Brett K Ingersoll, Andrew P Magyar, Andrew Czarnecki, Jesse Wheeler, Jonathan R Coppeta, Michael P Abban, Ronald Gatzke, Shelley I Fried, Seung Woo Lee, Amy E Duwel, Jonathan J Bernstein, Alik S Widge, Ana Hernandez-Reynoso, Aswini Kanneganti, Mario I Romero-Ortega, Stuart F Cogan
Wireless neural stimulators are being developed to address problems associated with traditional lead-based implants. However, designing wireless stimulators on the sub-millimeter scale (<1 mm3) is challenging. As device size shrinks, it becomes difficult to deliver sufficient wireless power to operate the device. Here, we present a sub-millimeter, inductively powered neural stimulator consisting only of a coil to receive power, a capacitor to tune the resonant frequency of the receiver, and a diode to rectify the radio-frequency signal to produce neural excitation...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29222172/proximal-aberrant-crypt-foci-associate-with-synchronous-neoplasia-and-are-primed-for-neoplastic-progression
#9
David A Drew, Allen Mo, James J Grady, Richard G Stevens, Joel B Levine, Bruce M Brenner, Joseph C Anderson, Faripour Forouhar, Michael J O'Brien, Thomas J Devers, Daniel W Rosenberg
Aberrant crypt foci (ACF) are the earliest morphologically identifiable lesion found within the human colon. Despite their relatively high frequency in the distal colon, few studies have examined the molecular characteristics of ACF within the proximal colon. In the following study, clinical participants (n=184) were screened for ACF using high-definition chromoendoscopy with contrast dye-spray. Following pathological confirmation, ACF biopsies were subjected to laser-capture microdissection (LCM) and epithelial cells were evaluated for somatic mutations with a customized colorectal cancer mutation panel using DNA-mass spectrometry...
December 8, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/29217818/proteomic-analysis-of-perfusate-from-machine-cold-perfusion-of-transplant-kidneys-insights-into-protection-from-injury
#10
Michael A J Moser, Katherine Sawicka, Steven Arcand, Preston O'Brien, Patrick Luke, Gavin Beck, Jolanta Sawicka, Alejandro Cohen, Grzegorz Sawicki
BACKGROUND Machine cold perfusion is beneficial to the preservation of kidneys for transplantation. At the end of preservation, the perfusion solution contains many proteins. Using a proteomics approach, we searched for useful biomarkers and potential therapeutic targets in the perfusate. Our program is unique in that all transplant kidneys (even living donor kidneys, LKD) are placed on machine cold perfusion prior to transplantation. MATERIAL AND METHODS Perfusates from donation after neurological and circulatory determination of death (DNDD and DCDD respectively) and LKD were collected (n=41) and analyzed for LDH, neutrophil gelatinase-associated lipocalin (NGAL), and matrix metalloproteinase-2 (MMP-2) as markers of injury...
December 8, 2017: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/29210329/a-concise-evidence-based-physical-examination-for-diagnosis-of-acromioclavicular-joint-pathology-a-systematic-review
#11
Michael K Krill, Samuel Rosas, KiHyun Kwon, Andrew Dakkak, Benedict U Nwachukwu, Frank McCormick
OBJECTIVES: The clinical examination of the shoulder joint is an undervalued diagnostic tool for evaluating acromioclavicular joint (AC) joint pathology. Applying evidence-based clinical tests enables providers to make an accurate diagnosis and minimize costly imaging procedures and potential delays in care. The purpose of this study was to create a decision tree analysis enabling simple and accurate diagnosis of AC joint pathology. METHODS: A systematic review of the Medline, Ovid and Cochrane Review databases was performed to identify level one and two diagnostic studies evaluating clinical tests for AC joint pathology...
December 6, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29195270/compositional-proteomics-the-effects-of-spatial-constraints-on-protein-quantification-utilizing-isobaric-tags
#12
Jonathon O'Brien, Jeremy D O'Connell, Joao A Paulo, Sanjukta Thakurta, Christopher M Rose, Michael P Weekes, Edward L Huttlin, Steven P Gygi
Mass spectrometry (MS) has become an accessible tool for whole proteome quantitation with the ability to characterize protein expression across thousands of proteins within a single experiment. A subset of MS quantification methods (e.g., SILAC and label-free) monitor the relative intensity of intact peptides, where thousands of measurements can be made from a single mass spectrum. An alternative approach, isobaric labeling, enables precise quantification of multiple samples simultaneously through unique and sample specific mass reporter ions...
December 1, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/29193464/functional-connectivity-in-dementia-with-lewy-bodies-a-within-and-between-network-analysis
#13
Julia Schumacher, Luis R Peraza, Michael Firbank, Alan J Thomas, Marcus Kaiser, Peter Gallagher, John T O'Brien, Andrew M Blamire, John-Paul Taylor
Dementia with Lewy bodies (DLB) is a common form of dementia and is characterized by cognitive fluctuations, visual hallucinations, and Parkinsonism. The phenotypic expression of the disease may, in part, relate to alterations in functional connectivity within and between brain networks. This resting-state study sought to clarify this in DLB, how networks differed from Alzheimer's disease (AD), and whether they were related to clinical symptoms in DLB. Resting-state networks were estimated using independent component analysis...
November 29, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/29190340/continuous-glucose-monitoring-for-hypoglycemia-avoidance-and-glucose-counterregulation-in-long-standing-type-1-diabetes
#14
Michael R Rickels, Amy J Peleckis, Cornelia Dalton-Bakes, Joseph R Naji, Nina A Ran, Huong-Lan Nguyen, Shannon O'Brien, Sanjian Chen, Insup Lee, Mark H Schutta
Context: Patients with long standing type 1 diabetes (T1D) are at increased risk for severe hypoglycemia due to defects in glucose counterregulation and hypoglycemia symptom recognition, in part mediated through exposure to hypoglycemia. Objective: To determine whether implementation of real-time continuous glucose monitoring (CGM) as a strategy for hypoglycemia avoidance could improve glucose counterregulation in patients with long standing T1D complicated by hypoglycemia unawareness...
November 28, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29172136/idh1-and-idh2-mutations-in-postoperative-diffuse-glioma-associated-epilepsy
#15
Andrew Neal, Patrick Kwan, Terence John O'Brien, Michael E Buckland, Michael Gonzales, Andrew Morokoff
OBJECTIVE: Isocitrate dehydrogenase 1 and 2 mutations (IDH1/2) have an established association with preoperative seizures in patients with grades II-IV diffuse gliomas. Here, we examined if IDH1/2 mutations are a biomarker of postoperative seizure frequency. METHODS: This was a retrospective study. Patients with grades II-IV supratentorial diffuse glioma, immunohistochemistry results of IDH1-R132H, and antiepileptic drug (AED) prescribed postoperatively were included...
November 21, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29171994/hippocampal-stratum-radiatum-lacunosum-and-moleculare-sparing-in-mild-cognitive-impairment
#16
Li Su, Lawrence Hayes, Soteris Soteriades, Guy Williams, Susannah A E Brain, Michael J Firbank, Giulia Longoni, Robert J Arnold, James B Rowe, John T O'Brien
BACKGROUND: Alzheimer's disease (AD) is associated with atrophy in entorhinal cortex (ERC), the hippocampus, and its subfields Cornu Ammonis 1 (CA1) and subiculum, which predict conversion from mild cognitive impairment (MCI) to clinical AD. The stratum radiatum, lacunosum, and moleculare (SRLM) are also important gateways involving ERC and CA1, which are affected by early AD pathology. OBJECTIVE: To assess whether the SRLM is affected in MCI and AD. METHODS: In this proof-of-concept study, 27 controls, 13 subjects with AD, and 22 with MCI underwent 3T MRI...
November 20, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/29164608/the-absolute-percent-deviation-of-ighv-mutation-rather-than-a-98-cut-off-predicts-survival-of-chronic-lymphocytic-leukaemia-patients-treated-with-fludarabine-cyclophosphamide-and-rituximab
#17
Preetesh Jain, Graciela M Nogueras González, Rashmi Kanagal-Shamanna, Uri Rozovski, Nawid Sarwari, Constantine Tam, William G Wierda, Philip A Thompson, Nitin Jain, Rajyalakshmi Luthra, Andres Quesada, Gabriela Sanchez-Petitto, Alessandra Ferrajoli, Jan Burger, Hagop Kantarjian, Jorge Cortes, Susan O'Brien, Michael J Keating, Zeev Estrov
The degree of somatic hypermutation, determined as percent deviation of immunoglobulin heavy chain gene variable region sequence from the germline (IGHV%), is an important prognostic factor in chronic lymphocytic leukaemia (CLL). Currently, a cut-off of 2% deviation or 98% sequence identity to germline in IGHV sequence is routinely used to dichotomize CLL patients into mutated and unmutated groups. Because dissimilar IGHV% cut-offs of 1-5% were identified in different studies, we wondered whether no cut-off should be applied and IGHV% treated as a continuous variable...
November 21, 2017: British Journal of Haematology
https://www.readbyqxmd.com/read/29164165/platelet-rich-plasma-for-primary-treatment-of-partial-ulnar-collateral-ligament-tears-mri-correlation-with-results
#18
J Banks Deal, Ed Smith, Wendell Heard, Michael J O'Brien, Felix H Savoie
Background: Jobe revolutionized the treatment of medial ulnar collateral ligament (MUCL) tears with his reconstruction technique. However, not all MUCL injuries require operative management; Rettig showed that 42% of MUCL injuries respond to conservative management. This was improved by Podesta, who showed that augmentation of nonoperative management with platelet-rich plasma (PRP) and magnetic resonance imaging (MRI) for detecting partial MUCL tears resulted in significantly higher success rates...
November 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29163914/increase-of-enzyme-activity-through-specific-covalent-modification-with-fragments
#19
John F Darby, Masakazu Atobe, James D Firth, Paul Bond, Gideon J Davies, Peter O'Brien, Roderick E Hubbard
Modulation of enzyme activity is a powerful means of probing cellular function and can be exploited for diverse applications. Here, we explore a method of enzyme activation where covalent tethering of a small molecule to an enzyme can increase catalytic activity (kcat/KM) up to 35-fold. Using a bacterial glycoside hydrolase, BtGH84, we demonstrate how small molecule "fragments", identified as activators in free solution, can be covalently tethered to the protein using Michael-addition chemistry. We show how tethering generates a constitutively-activated enzyme-fragment conjugate, which displays both improved catalytic efficiency and increased susceptibility to certain inhibitor classes...
November 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29162126/targeting-the-master-regulator-mtor-a-new-approach-to-prevent-the-neurological-of-consequences-of-parasitic-infections
#20
REVIEW
Sheila Donnelly, Wilhelmina M Huston, Michael Johnson, Natalia Tiberti, Bernadette Saunders, Bronwyn O'Brien, Catherine Burke, Maurizio Labbate, Valery Combes
A systematic analysis of 240 causes of death in 2013 revealed that parasitic diseases were responsible for more than one million deaths. The vast majority of these fatalities resulted from protozoan infections presenting with neurological sequelae. In the absence of a vaccine, development of effective therapies is essential to improving global public health. In 2015, an intriguing strategy to prevent cerebral malaria was proposed by Gordon et al. 2015 mBio, 6:e00625. Their study suggested that inhibition of the mammalian target of rapamycin prevented experimental cerebral malaria by blocking the damage to the blood brain barrier and stopping the accumulation of parasitized red blood cells and T cells in the brain...
November 21, 2017: Parasites & Vectors
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