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Hussain Mohamad Awwad, Juergen Geisel, Rima Obeid
BACKGROUND: Trimethylamine-N-oxide (TMAO) is produced in the liver from trimethylamine (TMA) and is an important cellular osmolyte and potential atherogenic factor. Taurine is involved in cholesterol metabolism and also serves as a cellular osmolyte. Given their significant biological functions, the development of reliable measurement techniques is crucial to further study their role in health and disease METHODS: A new ultrahigh performance liquid chromatography-tandem mass spectrometry method was developed and validated for the simultaneous determination of TMA, TMAO, and taurine in plasma and urine...
October 15, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Joseph M Obeid, Nolan A Wages, Yinin Hu, Donna H Deacon, Craig L Slingluff
INTRODUCTION: Infiltration of non-small-cell lung cancer (NSCLC) by CD8(+) T lymphocytes predicts improved patient survival; however, heterogeneity of intratumoral localization complicates this assessment. Strategies for tumor sampling may not accurately represent the whole tumor. We hypothesized that sampling strategies may alter the identification of tumors with high CD8 density and affect the prognostic significance. PATIENTS AND METHODS: Twenty-three primary NSCLC tumors were immunohistochemically stained for CD8 and were assessed using automated software with eight different sampling strategies or the whole tumor...
October 21, 2016: Cancer Immunology, Immunotherapy: CII
Songjia Lu, Chunhui Cai, Gonghong Yan, Zhuan Zhou, Yong Wan, Vicky Chen, Lujia Chen, Gregory F Cooper, Lina M Obeid, Yusuf A Hannun, Adrian V Lee, Xinghua Lu
Defining processes that are synthetic lethal with p53 mutations in cancer cells may reveal possible therapeutic strategies. In this study, we report the development of a signal-oriented computational framework for cancer pathway discovery in this context. We applied our bipartite-graph-based functional module discovery algorithm to identify transcriptomic modules abnormally expressed in multiple tumors, such that the genes in a module were likely regulated by a common, perturbed signal. For each transcriptomic module, we applied our weighted k-path merge algorithm to search for a set of somatic genome alterations (SGA) that likely perturbed the signal, i...
October 10, 2016: Cancer Research
Rawad Obeid, Tammy N Tsuchida
Conventional EEG and amplitude-integrated electroencephalography are used in neonates to assess prognosis and significant changes in brain activity. Neuroactive medications and hypothermia can influence brain activity and therefore alter EEG interpretation. There are limited studies on the effect of these therapies on neonatal EEG background activity. Medication effects on the EEG or amplitude-integrated electroencephalography include increased interburst interval duration, voltage suppression, and sleep disruption...
October 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
Isibor Arhuidese, Tammam Obeid, Besma Nejim, Satinderjit Locham, Caitlin W Hicks, Mahmoud B Malas
BACKGROUND: Restenosis after carotid endarterectomy (CEA) is associated with an increased risk of stroke, and the management of critical or symptomatic restenotic lesions poses a treatment challenge. The superiority of CEA vs carotid angioplasty and stenting (CAS) for restenosis remains debatable because existing studies are few and limited by small sample size or the inability to align interventions with ipsilateral events beyond the periprocedural period. We performed a population-based evaluation of CEA vs CAS in a large contemporary cohort of patients with carotid artery restenosis...
October 1, 2016: Journal of Vascular Surgery
Omar Abuyaman, Niels Torring, Rima Obeid, Ebba Nexo
BACKGROUND: Human placenta expresses CD320, a receptor that ensures the uptake of holo-transcobalamin (holoTC). Soluble CD320 (sCD320) is present in the circulation and its concentration increases during pregnancy. AIMS: To investigate a possible association of sCD320, holoTC and total transcobalamin (TC) with the risk of subsequent preeclampsia using serum samples from asymptomatic first trimester pregnant women. Moreover, we aimed to establish reference intervals of the aforementioned biomarkers for first trimester pregnant women who remained healthy throughout pregnancy...
October 4, 2016: Scandinavian Journal of Clinical and Laboratory Investigation
María José Hernández-Corbacho, Mohamed F Salama, Daniel Canals, Can E Senkal, Lina M Obeid
Sphingolipids are bioactive lipids found in cell membranes that exert a critical role in signal transduction. In recent years, it has become apparent that sphingolipids participate in growth, senescence, differentiation and apoptosis. The anabolism and catabolism of sphingolipids occur in discrete subcellular locations and consist of a strictly regulated and interconnected network, with ceramide as the central hub. Altered sphingolipid metabolism is linked to several human diseases. Hence, an advanced knowledge of how and where sphingolipids are metabolized is of paramount importance in order to understand the role of sphingolipids in cellular functions...
September 30, 2016: Biochimica et Biophysica Acta
Amira Obeid, Mark Pucci, Una Martin, Wasim Hanif
Sodium glucose co-transporter 2 inhibitors lower blood pressure by osmotic diuresis and can be considered in diabetic patients with resistant hypertension.
September 2016: JRSM Open
Antonio H Frangieh, Jasmina Alibegovic, Christian Templin, Oliver Gaemperli, Slayman Obeid, Robert Manka, Erik W Holy, Willibald Maier, Thomas F Lüscher, Ronald K Binder
BACKGROUND: Left atrial appendage occlusion (LAAO) is mostly performed by transesophageal echocardiography (TEE) guidance. Intracardiac echocardiography (ICE) may be an alternative imaging modality for LAAO that precludes the need for general anesthesia or sedation. METHODS AND RESULTS: All consecutive single center, single operator LAAO candidates were analyzed. Baseline clinical and procedural characteristics and in-hospital outcomes were compared between patients in whom a Watchman was implanted with ICE vs...
September 21, 2016: Catheterization and Cardiovascular Interventions
Mónica García-Barros, Nicolas Coant, Toshihiko Kawamori, Masayuki Wada, Ashley J Snider, Jean-Philip Truman, Bill X Wu, Hideki Furuya, Christopher J Clarke, Agnieszka B Bialkowska, Amr Ghaleb, Vincent W Yang, Lina M Obeid, Yusuf A Hannun
Alterations in sphingolipid metabolism, especially ceramide and sphingosine 1-phosphate, have been linked to colon cancer, suggesting that enzymes of sphingolipid metabolism may emerge as novel regulators and targets in colon cancer. Neutral ceramidase (nCDase), a key enzyme in sphingolipid metabolism that hydrolyzes ceramide into sphingosine, is highly expressed in the intestine; however, its role in colon cancer has not been defined. Here we show that molecular and pharmacological inhibition of nCDase in colon cancer cells increases ceramide, and this is accompanied by decreased cell survival and increased apoptosis and autophagy, with minimal effects on noncancerous cells...
September 8, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Federico Moser, Franco José Signorini, Pablo Sergio Maldonado, Veronica Gorodner, Arturo Lopez Sivilat, Lucio Ricardo Obeide
INTRODUCTION: Bochdalek hernia is a congenital diaphragmatic defect that results from improper fusion of the septum transversum and the pleuroperitoneal folds. It rarely persists asymptomatic until adulthood. The reported incidence is as low as 0.17%. Surgical repair of the defect can be performed through the abdomen or through the chest, and in both cases open or through laparoscopy/thoracoscopy. CASE REPORT: We present 2 cases of fully laparoscopic repair of giant Bochdalek hernia in adults...
September 7, 2016: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
Rita Obeid, Patricia J Brooks, Kasey L Powers, Kristen Gillespie-Lynch, Jarrad A G Lum
Impairments in statistical learning might be a common deficit among individuals with Specific Language Impairment (SLI) and Autism Spectrum Disorder (ASD). Using meta-analysis, we examined statistical learning in SLI (14 studies, 15 comparisons) and ASD (13 studies, 20 comparisons) to evaluate this hypothesis. Effect sizes were examined as a function of diagnosis across multiple statistical learning tasks (Serial Reaction Time, Contextual Cueing, Artificial Grammar Learning, Speech Stream, Observational Learning, and Probabilistic Classification)...
2016: Frontiers in Psychology
Sameh Obeid, Adam Ceroi, Guillaume Mourey, Philippe Saas, Celine Elie-Caille, Wilfrid Boireau
Blood microparticles (MPs) are small membrane vesicles (50-1000nm), derived from different cell types. They are known to play important roles in various biological processes and also recognized as potential biomarkers of various health disorders. Different methods are currently used for the detection and characterization of MPs, but none of these methods is capable to quantify and qualify total MPs at the same time, hence, there is a need to develop a new approach for simultaneous detection, characterization and quantification of microparticles...
August 29, 2016: Biosensors & Bioelectronics
Rima Obeid, Hussain M Awwad, Susanne H Kirsch, Christiane Waldura, Wolfgang Herrmann, Stefan Graeber, Juergen Geisel
SCOPE: We compared the effect of supplementation with vitamin D + B or vitamin D on plasma trimethylamine N-oxide (TMAO) and choline metabolites. METHODS AND RESULTS: This is a randomized single-blinded nonplacebo-controlled study. Twenty-seven participants received 1200 IU vitamin D3 and 800 mg calcium, and 25 participants received additionally 0.5 mg folic acid, 50 mg B6, and 0.5 mg B12 for 1 year. Plasma homocysteine (Hcy), TMAO, and choline metabolites were measured at baseline and 12 months later...
August 28, 2016: Molecular Nutrition & Food Research
Besma Nejim, Tammam Obeid, Isibor Arhuidese, Caitlin Hicks, Sophie Wang, Joseph Canner, Mahmoud Malas
BACKGROUND: The aim of our study was to compare and identify possible predictors of perioperative outcomes of carotid endarterectomy (CEA) with carotid artery stenting (CAS) using the procedure-targeted American College of Surgeons National Surgical Quality Improvement Program database. METHODS: Patients who underwent CEA or CAS were identified in American College of Surgeons National Surgical Quality Improvement Program (2011-2013). Univariate and multivariable logistic regression analyses were performed to evaluate the predictors of perioperative outcomes (any stroke or death, myocardial infarction [MI], 30-d readmission and reoperation)...
August 2016: Journal of Surgical Research
Rima Obeid, Hussain M Awwad, Markus Keller, Juergen Geisel
PURPOSE: Restriction of animal foods and choline may affect plasma trimethylamine-N-oxide (TMAO). In vegetarians, we investigated the association between TMAO concentrations and the strictness of the diet or sex. We also studied the biological variations of TMAO in vegans. METHODS: Concentrations of plasma TMAO and choline metabolites were measured in 38 vegans and 67 lacto-ovo-vegetarians (group 1: mean age ± SD = 50 ± 15 years). Group 2 consisted of 66 vegans (29...
August 25, 2016: European Journal of Nutrition
Vincent Challier, Louis Boissiere, Ibrahim Obeid, Jean-Marc Vital, Jean-Etienne Castelain, Antoine Bénard, Nathalie Ong, Soufiane Ghailane, Vincent Pointillart, Simon Mazas, Rémi Mariey, Olivier Gille
STUDY DESIGN: .: Monocentric Open-label Randomized Controlled Trial (MRCT) OBJECTIVE..: Comparison of clinical and radiological outcomes between isolated instrumented posterior fusion (PLF) and associated instrumented posterior fusion and interbody fusion by transforaminal approach (PLF + TLIF) for patients suffering from one-level lumbar degenerative spondylolisthesis (DS) undergoing to surgery. SUMMARY OF BACKGROUND DATA: .: DS is a common cause of symptomatic lumbar stenosis...
August 19, 2016: Spine
Isibor Arhuidese, Rebecca Craig-Schapiro, Tammam Obeid, Besma Nejim, Caitlin W Hicks, Mahmoud B Malas
BACKGROUND: In multiple studies, chronic renal insufficiency has been associated with increased risk of periprocedural stroke, cardiac complications, and death following carotid revascularization. Renal transplantation has been shown to reduce cardiovascular risk and improve survival; outcomes after carotid revascularization in renal transplant patients however are unknown. In this study, we evaluate periprocedural and long-term risks after carotid endarterectomy (CEA) and carotid artery stenting (CAS) in a cohort of renal transplant patients...
August 12, 2016: Annals of Vascular Surgery
Vugar Nabiyev, Selim Ayhan, Selcen Yuksel, Asli Niyazi, Tiro Mmopelwa, Montse Domingo-Sabat, Alba Vila-Casademunt, Ferran Pellise, Ahmet Alanay, Francisco J Perez-Grueso, Frank Kleinstück, Ibrahim Obeid, Emre Acaroglu, European Spine Study Group
AIM: To analyze the cognitive abilities of older patients undergoing spinal deformity surgery so as to understand whether adult spinal deformity (ASD) surgery is associated with postoperative cognitive malfunction. MATERIAL AND METHODS: A prospective longitudinal study was performed on surgical patients older than 50 years, enrolled in a prospective multicenter database. Mini-mental state examination (MMSE) was performed to assess cognitive function in addition to the HRQOL tests; (SF-36, ODI and SRS-22) at pre-operative, post-operative 6 weeks and 6 months points...
June 24, 2016: Turkish Neurosurgery
Henry K Njovu, Domina Mgelwa, Elibariki H Shilla, Obeid Mahenya, Rudolf F Mremi
No abstract text is available yet for this article.
September 2016: High Altitude Medicine & Biology
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