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https://www.readbyqxmd.com/read/28535205/a-transcriptional-serenaid-the-role-of-noncoding-rnas-in-class-switch-recombination
#1
William T Yewdell, Jayanta Chaudhuri
During an immune response, activated B cells may undergo class switch recombination (CSR), a molecular rearrangement that allows B cells to switch from expressing IgM and IgD to a secondary antibody heavy chain isotype such as IgG, IgA, or IgE. Secondary antibody isotypes provide the adaptive immune system with distinct effector functions to optimally combat various pathogens. CSR occurs between repetitive DNA elements within the immunoglobulin heavy chain (Igh) locus, termed switch (S) regions, and requires the DNA modifying enzyme activation-induced cytidine deaminase (AID)...
May 23, 2017: International Immunology
https://www.readbyqxmd.com/read/28534802/organ-location-determination-and-contour-sparse-representation-for-multi-organ-segmentation
#2
Siqi Li, Huiyan Jiang, Yu-Dong Yao, Benqiang Yang
Organ segmentation on computed tomography (CT) images is of great importance in medical diagnoses and treatment. This paper proposes organ location determination and contour sparse representation methods (OLD-CSR) for multiorgan segmentation (liver, kidney, and spleen) on abdomen CT images using an extreme learning machine (ELM) classifier. First, a location determination method is designed to obtain location information of each organ, which is used for coarse segmentation. Second, for coarse-to-fine segmentation, a contour gradient and rate change based feature point extraction method is proposed...
May 17, 2017: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28534715/knowledge-attitudes-and-behaviors-related-to-child-safety-restraint-in-citizens-of-shenzhen-municipality-china-and-the-associations-between-these-factors
#3
Shengyuan Liu, Haibin Zhou, Jianping Ma, Changyi Wang, Zhongwei Chen, Sihan Chen, Yingzhou Yang, Xiaoli Liu, Ji Peng, Leilei Duan, Xiao Deng
Objective-A child safety restraint (CSR) is an effective measure to reduce the risk of child injury from traffic collisions. This study aims to explore knowledge, attitudes and behaviors regarding CSR in a Chinese population. Methods-A cross-sectional survey regarding CSR use was conducted from April to May 2014 in Shenzhen Municipality. Respondents were parents who had at least one child 0 to 6 years of age and simultaneously owned a car. These parents provided a self-report of demographic characteristics as well as information about their knowledge, attitudes and behaviors toward CSR use...
May 23, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28533409/inducible-ctcf-insulator-delays-the-igh-3-regulatory-region-mediated-activation-of-germline-promoters-and-alters-class-switching
#4
Fatima-Zohra Braikia, Chloé Oudinet, Dania Haddad, Zeliha Oruc, Domenico Orlando, Audrey Dauba, Marc Le Bert, Ahmed Amine Khamlichi
Class switch recombination (CSR) plays an important role in adaptive immune response by enabling mature B cells to switch from IgM expression to the expression of downstream isotypes. CSR is preceded by inducible germline (GL) transcription of the constant genes and is controlled by the 3' regulatory region (3'RR) in a stimulus-dependent manner. Why the 3'RR-mediated up-regulation of GL transcription is delayed to the mature B-cell stage is presently unknown. Here we show that mice devoid of an inducible CTCF binding element, located in the α constant gene, display a marked isotype-specific increase of GL transcription in developing and resting splenic B cells and altered CSR in activated B cells...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28515723/different-somatic-hypermutation-levels-among-antibody-subclasses-disclosed-by-a-new-next-generation-sequencing-based-antibody-repertoire-analysis
#5
Kazutaka Kitaura, Hiroshi Yamashita, Hitomi Ayabe, Tadasu Shini, Takaji Matsutani, Ryuji Suzuki
A diverse antibody repertoire is primarily generated by the rearrangement of V, D, and J genes and subsequent somatic hypermutation (SHM). Class-switch recombination (CSR) produces various isotypes and subclasses with different functional properties. Although antibody isotypes and subclasses are considered to be produced by both direct and sequential CSR, it is still not fully understood how SHMs accumulate during the process in which antibody subclasses are generated. Here, we developed a new next-generation sequencing (NGS)-based antibody repertoire analysis capable of identifying all antibody isotype and subclass genes and used it to examine the peripheral blood mononuclear cells of 12 healthy individuals...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28509355/lon-protease-modulates-virulence-traits-in-erwinia-amylovora-by-directly-monitoring-major-regulators-and-indirectly-through-the-rcs-and-gac-csr-regulatory-systems
#6
Jae Hoon Lee, Veronica Ancona, Youfu Zhao
Lon, an ATP-dependent protease in bacteria, influences diverse cellular processes by degrading damaged, misfolded and short-lived regulatory proteins. In this study, we characterized the effects of lon mutation and determined the molecular mechanisms underlying Lon-mediated virulence regulation in Erwinia amylovora, an enterobacterial pathogen of apple. E. amylovora depends on the type III secretion system (T3SS) and the exopolysaccharide (EPS) amylovoran to cause disease. Our results showed that mutation of the lon gene led to overproduction of amylovoran, increased T3SS gene expression and non-motile phenotype...
May 16, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28508466/comparison-of-the-time-taken-for-localised-breast-surgery-pre-and-post-introduction-of-intra-operative-digital-specimen-mammography
#7
Vinicius Carraro do Nascimento, Anita G Bourke
INTRODUCTION: More than half of the patients with an impalpable malignant breast lesion have a mammographically detected and imaged-guided localisation, which can be technically challenging for the breast surgeon. Specimen imaging is used to confirm successful excision of the localised index lesion and has improved the operating list efficiency resulting in a higher number of excisions per surgical list. The aim of this study was to evaluate whether introducing IDSM (intra-operative digital specimen mammography) saved operation time for localised breast surgery...
May 16, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28497846/survival-after-second-and-subsequent-recurrences-in-osteosarcoma-a-retrospective-multicenter-analysis
#8
Elisa Tirtei, Sebastian D Asaftei, Rosaria Manicone, Marilena Cesari, Anna Paioli, Michele Rocca, Stefano Ferrari, Franca Fagioli
PURPOSE: Osteosarcoma (OS) is the most common primary bone tumor. Despite complete surgical removal and intensive chemotherapeutic treatment, 30%-35% of patients with OS have local or systemic recurrence. Some patients survive multiple recurrences, but overall survival after OS recurrence is poor. This analysis aims to describe and identify factors influencing post-relapse survival (PRS) after a second OS relapse. METHODS: This is a retrospective analysis of 60 patients with a second relapse of OS of the extremities in 2 Italian centers between 2003 and 2013...
May 10, 2017: Tumori
https://www.readbyqxmd.com/read/28493692/uptake-kinetics-and-subcellular-compartmentalization-explain-lethal-but-not-sublethal-effects-of-cadmium-in-two-closely-related-amphipod-species
#9
Lena Jakob, Daria S Bedulina, Denis V Axenov-Gribanov, Michael Ginzburg, Zhanna M Shatilina, Yulia A Lubyaga, Ekaterina V Madyarova, Anton N Gurkov, Maxim A Timofeyev, Hans-O Portner, Franz J Sartoris, Rolf Altenburger, Till Luckenbach
Eulimnogammarus cyaneus and Eulimnogammarus verrucosus, closely related amphipod species endemic to Lake Baikal, differ with respect to body size (10- to 50-fold lower fresh weights of E. cyaneus) and cellular stress response (CSR) capacity potentially causing species-related differences in uptake, internal sequestration and toxic sensitivity to waterborne cadmium (Cd). We found that, compared to E. verrucosus, Cd uptake rates, related to a given exposure concentration, were higher and lethal concentrations (50%; LC50) were 2...
May 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28487533/spatial-and-temporal-patterns-of-commercial-citrus-trees-affected-by-phyllosticta-citricarpa-in-florida
#10
Katherine E Hendricks, Mary Christman, Pamela D Roberts
Citrus black spot (CBS) caused by Phyllosticta citricarpa, is the most recent introduction of an exotic citrus pathogen into Florida and has been a challenge to control to date. Understanding the dispersal pattern of the disease within affected groves is vital in developing effective control strategies to limit the spread of the disease. The spatial pattern of CBS-affected trees was studied in two commercial 'Valencia' orange groves over three consecutive citrus seasons. Cluster analyses based on nearest-neighbor distance (F, G and J-functions) and pairwise distances between points (Ripley's K function, Besag's L function and the pair correlation function, g) were used to test the hypothesis of complete spatial randomness (CSR) of CBS infected trees within the groves...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28482797/association-of-cumulative-social-risk-with-mortality-and-adverse-cardiovascular-disease-outcomes
#11
Sebhat Erqou, Justin B Echouffo-Tcheugui, Kevin E Kip, Aryan Aiyer, Steven E Reis
BACKGROUND: Quantifying the cumulative effect of social risk factors on cardiovascular disease (CVD) risk can help to better understand the sources of disparities in health outcomes. METHOD AND RESULTS: Data from the Heart Strategies Concentrating on Risk Evaluation (HeartSCORE) study were used to create an index of cumulative social risk (CSR) and quantify its association with incident CVD and all-cause mortality. CSR was defined by assigning a score of 1 for the presence of each of 4 social factors: i) racial minority status (Black race), ii) single living status, iii) low income, and iv) low educational level...
May 8, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/28472438/the-impact-of-chronic-sleep-restriction-on-neuronal-number-and-volumetric-correlates-of-the-dorsal-respiratory-nuclei-in-a-rat-model
#12
Ali-Mohammad Kamali, Fatemeh Karimi, Saied Karbalay-Doust, Mohammad Nami, Ali Noorafshan
Study Objectives: Sleep restriction can result in a range of neurophysiological consequences in the brain including some brain stem nuclei. This study aimed to evaluate the effects of chronic sleep restriction (CSR) on quantitative aspects of brain stem respiratory centers using stereological methods. Methods: Male rats were randomly assigned into experimental group (CSR through a modified multiple platform apparatus), corresponding apparatus-control group (grid-floor control) and cage controls...
May 2, 2017: Sleep
https://www.readbyqxmd.com/read/28470132/value-based-hr-practices-i-deals-and-clinical-error-control-with-csr-as-a-moderator
#13
Tuan Luu, Chris Rowley, Sununta Siengthai, Vo Thanh Thao
Purpose Notwithstanding the rising magnitude of system factors in patient safety improvement, "human factors" such as idiosyncratic deals (i-deals) which also contribute to the adjustment of system deficiencies should not be neglected. The purpose of this paper is to investigate the role of value-based HR practices in catalyzing i-deals, which then influence clinical error control. The research further examines the moderating role of corporate social responsibility (CSR) on the effect of value-based HR practices on i-deals...
May 8, 2017: International Journal of Health Care Quality Assurance
https://www.readbyqxmd.com/read/28467884/impairment-of-pulmonary-diffusion-correlates-with-hypoxemic-burden-in-central-sleep-apnea-heart-failure-patients
#14
Henrik Fox, Britta Koerber, Thomas Bitter, Dieter Horstkotte, Olaf Oldenburg
PURPOSE: Central sleep apnea (CSA) and Cheyne-Stokes respiration (CSR) are highly prevalent in heart failure (HF) and are linked to increased mortality. Impaired pulmonary diffusion capacity [DLCO] and [KCO]) have been suggested to play a key role in CSA-CSR pathophysiology. This study investigated the relationship between HF, CSR, DLCO and KCO in well-characterized HF patients. METHODS: This prospective study included HF patients with CSR, all patients underwent full overnight polysomnography (PSG) and lung function testing...
April 30, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28467390/cooperative-spatial-retreat-for-resilient-drone-networks
#15
Jin-Hyeok Kang, Young-Min Kwon, Kyung-Joon Park
Drones are broadening their scope to various applications such as networking, package delivery, agriculture, rescue, and many more. For proper operation of drones, reliable communication should be guaranteed because drones are remotely controlled. When drones experience communication failure due to bad channel condition, interference, or jamming in a certain area, one existing solution is to exploit mobility or so-called spatial retreat to evacuate them from the communication failure area. However, the conventional spatial retreat scheme moves drones in random directions, which results in inefficient movement with significant evacuation time and waste of battery lifetime...
May 3, 2017: Sensors
https://www.readbyqxmd.com/read/28464860/occupational-safety-and-health-aspects-of-corporate-social-responsibility-reporting-in-japan-from-2004-to-2012
#16
Tomohisa Nagata, Akinori Nakata, Koji Mori, Takashi Maruyama, Futoshi Kawashita, Masako Nagata
BACKGROUND: A number of companies publish corporate social responsibility (CSR) reporting in booklets and other publicly available formats. The purpose of this paper is to clarify the nine-year (2004-2012) trend of occupational safety and health (OSH) activities as described in CSR reporting (by industry sector and company size). METHODS: We investigated CSR reporting on the website in all Japanese companies listed on the first section of the Tokyo Stock Exchange...
May 2, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28439247/when-corporate-social-responsibility-csr-meets-organizational-psychology-new-frontiers-in-micro-csr-research-and-fulfilling-a-quid-pro-quo-through-multilevel-insights
#17
David A Jones, Chelsea R Willness, Ante Glavas
Researchers, corporate leaders, and other stakeholders have shown increasing interest in Corporate Social Responsibility (CSR)-a company's discretionary actions and policies that appear to advance societal well-being beyond its immediate financial interests and legal requirements. Spanning decades of research activity, the scholarly literature on CSR has been dominated by meso- and macro-level perspectives, such as studies within corporate strategy that examine relationships between firm-level indicators of social/environmental performance and corporate financial performance...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28436072/real-time-individualization-of-the-unified-model-of-performance
#18
Jianbo Liu, Sridhar Ramakrishnan, Srinivas Laxminarayan, Thomas J Balkin, Jaques Reifman
Existing mathematical models for predicting neurobehavioural performance are not suited for mobile computing platforms because they cannot adapt model parameters automatically in real time to reflect individual differences in the effects of sleep loss. We used an extended Kalman filter to develop a computationally efficient algorithm that continually adapts the parameters of the recently developed Unified Model of Performance (UMP) to an individual. The algorithm accomplishes this in real time as new performance data for the individual become available...
April 24, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28426321/hansae-vietnam-s-garment-factory-latest-example-of-how-corporate-social-responsibility-has-failed-to-protect-workers
#19
Garrett Brown
A Korean-operated garment factory complex in Vietnam was subject to 26 separate corporate social responsibility (CSR) audits in 2015. However, thorough inspections by two other non-governmental organizations in 2016 found numerous violations of Vietnamese occupational health and safety and labor laws as well as violations of the corporate codes of conduct of the international clothing brands which source apparel from the facility. The 2016 investigations indicate the lack of efficacy of the 2015 CSR audits and call into question whether voluntary CSR programs and audits by for-profit CSR monitoring companies can effectively protect the health, safety and legal rights of workers in global supply chains...
April 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28416602/antigen-receptor-galaxy-a-user-friendly-web-based-tool-for-analysis-and-visualization-of-t-and-b-cell-receptor-repertoire-data
#20
Hanna IJspeert, Pauline A van Schouwenburg, David van Zessen, Ingrid Pico-Knijnenburg, Andrew P Stubbs, Mirjam van der Burg
Antigen Receptor Galaxy (ARGalaxy) is a Web-based tool for analyses and visualization of TCR and BCR sequencing data of 13 species. ARGalaxy consists of four parts: the demultiplex tool, the international ImMunoGeneTics information system (IMGT) concatenate tool, the immune repertoire pipeline, and the somatic hypermutation (SHM) and class switch recombination (CSR) pipeline. Together they allow the analysis of all different aspects of the immune repertoire. All pipelines can be run independently or combined, depending on the available data and the question of interest...
May 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
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