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https://www.readbyqxmd.com/read/29216327/protamine-neutralizes-chondroitin-sulfate-proteoglycan-mediated-inhibition-of-oligodendrocyte-differentiation
#1
Kazuya Kuboyama, Naomi Tanga, Ryoko Suzuki, Akihiro Fujikawa, Masaharu Noda
Chondroitin sulfate proteoglycans (CSPGs), which are enriched in demyelinating plaques in neurodegenerative diseases, such as multiple sclerosis (MS), impair remyelination by inhibiting the migration and differentiation of oligodendrocyte precursor cells (OPCs) in the central nervous system (CNS). We herein show that protamine (PRM, also known as a heparin antagonist) effectively neutralizes the inhibitory activities of CSPGs, thereby enhancing OPC differentiation and (re)myelination in mice. Cell-based assays using mouse OPC-like OL1 cells revealed that the PRM treatment exerted masking effects on extracellular CSPGs and improved oligodendrocyte differentiation on inhibitory CSPG-coated substrates...
2017: PloS One
https://www.readbyqxmd.com/read/29206831/prognostic-value-of-aldh2-polymorphism-for-patients-with-oropharyngeal-cancer-in-a-japanese-population
#2
Hirotaka Shinomiya, Hitomi Shinomiya, Mie Kubo, Yuki Saito, Masafumi Yoshida, Mizuo Ando, Masanori Teshima, Naoki Otsuki, Naomi Kiyota, Ryohei Sasaki, Ken-Ichi Nibu
BACKGROUND: Half of Japanese possess a polymorphism of aldehyde dehydrogenase 2(ALDH2), while few white individuals possess this mutation. The purpose of this study was to investigate the possibility of ALDH2 polymorphism as a prognostic factor for oropharyngeal cancer (OPC) among Japanese population. METHODS: We analyzed 82 Japanese patients with OPC treated between 2006 and 2011. The median observation period was 50 months. P16-staining and ALDH2 polymorphisms were investigated...
2017: PloS One
https://www.readbyqxmd.com/read/29206111/optical-proximity-correction-opc-in-near-field-lithography-with-pixel-based-field-sectioning-time-modulation
#3
Seonghyeon Oh, Dandan Han, Shim Hyeon Bo, Jae Won Hahn
Sub-wavelength features have been successfully demonstrated in near-field lithography. In this study, the point spread function (PSF) of a near-field beam spot from a plasmonic ridge nanoaperture is discussed with regard to the complex decaying characteristic of a non-propagating wave and the asymmetry of the field distribution for pattern design. We relaxed the shape complexity of the field distribution with a pixel-based optical proximity correction (OPC) for simplifying the pattern image distortion. To enhance the pattern fidelity for a variety of arbitrary patterns, field sectioning structures are formulated via convolutions with a time-modulation function and a transient PSF along the near-field dominant direction...
December 5, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29205833/monocarboxylate-transporter-1-and-the-vulnerability-of-oligodendrocyte-lineage-cells-to-metabolic-stresses
#4
Peng Zhou, Teng Guan, Zhao Jiang, Mike Namaka, Qing-Jun Huang, Ji-Ming Kong
AIMS: Oligodendrocytes, especially oligodendrocyte precursor cells, are known to be sensitive to hypoxic and metabolic stresses. Vulnerability of oligodendrocytes is considered a contributing factor to white matter dysfunction. However, little is known about the energy processing characteristics of oligodendrocyte lineage cells under basal and metabolic stress conditions. The aim of this study was to identify the energy requirements and cellular responses of oligodendrocytes at different developmental stages...
December 4, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29201079/docking-studies-synthesis-and-in-vitro-evaluation-of-novel-oximes-based-on-nitrones-as-reactivators-of-inhibited-acetylcholinesterase
#5
Seyed Ayoub Hosseini, Abolghasem Moghimi, Maryam Iman, Firoz Ebrahimi
Acetylcholinesterase has important role in synaptic cleft. It breaks down the acetylcholineat cholinergic synapsesand terminates the cholinergic effects. Some chemical agents like organophosphorus compounds (OPCs) including nerve agents and pesticides react with acetylcholinesteraseirreversibly. They inhibit normal biological enzyme action and result in accumulation of acetylcholineand show toxic effects andcholinergic symptoms. The process of Acetylcholinesterase (AChE) inhibition can be reversed by a nucleophilic agent to dephosphorylate and reactivate the enzyme...
2017: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29187118/multifocal-human-papillomavirus-detection-in-palatine-and-pharyngeal-tonsils
#6
Shigeyuki Murono, Hiroshi Yoshida, Tetsuro Kobayashi, Tomotaka Kawase, Daisuke Kikuchi, Toshihiko Suzuki, Yosuke Nakanishi, Kazuhira Endo, Satoru Kondo, Naohiro Wakisaka, Tomokazu Yoshizaki
BACKGROUND: Multifocal human papillomavirus (HPV) infection into the palatine and pharyngeal tonsils, which might be linked to a second primary tumor of HPV-positive oropharyngeal cancer (OPC), was investigated. PATIENTS AND METHODS: One hundred and five patients with various head and neck diseases including 14 patients with OPC were enrolled in this study. Swabs from the palatine and pharyngeal tonsils were collected in each individual, and auto-nested GP5+/GP6+ PCR for HPV DNA was performed...
November 29, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29184483/h3k9ac-and-hdac2-activity-are-involved-in-the-expression-of-monocarboxylate-transporter-1-in-oligodendrocyte
#7
Qingwei Lai, Wantong Du, Jian Wu, Xiao Wang, Xinyu Li, Xuebin Qu, Xiuxiang Wu, Fuxing Dong, Ruiqin Yao, Hongbin Fan
Recently, it is reported that monocarboxylate transporter 1 (MCT1) plays crucial role in oligodendrocyte differentiation and myelination. We found that MCT1 is strongly expressed in oligodendrocyte but weakly expressed in oligodendrocyte precursors (OPCs), and the underlying mechanisms remain elusive. Histone deacetylases (HDACs) activity is required for induction of oligodendrocyte differentiation and maturation. We asked whether HDACs are involved in the regulation of MCT1 expression. This work revealed that the acetylation level of histone H3K9 (H3K9ac) was much higher in mct1 gene (Slc16a1) promoter in OPCs than that in oligodendrocyte...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29175488/influence-of-the-epileptiform-discharge-microenvironment-on-the-differentiation-of-oligodendrocyte-precursor-cells
#8
Yue Wang, Liming Liu, Hengsheng Chen, Li Cheng, Li Jiang
The use of related cell cultured models to investigate the genesis and development of epilepsy is beneficial for exploring the mechanism of epileptogenesis. Recent reports have described the myelination damage caused by epilepsy in animal models; however, limited reports have focused on the influence of epilepsy on remyelination in vitro. The current study was designed to investigate the effect of the epileptiform discharge microenvironment on the differentiation of oligodendrocyte precursor cells (OPCs). Neurons with epileptiform discharge released more glutamic acid than normal neurons, which was detected by HPLC...
November 23, 2017: Brain Research
https://www.readbyqxmd.com/read/29174019/collar-occupancy-a-new-quantitative-imaging-tool-for-morphometric-analysis-of-oligodendrocytes
#9
Filipa Bouçanova, André Filipe Maia, Andrea Cruz, Val Millar, Inês Mendes Pinto, João Bettencourt Relvas, Helena Sofia Domingues
BACKGROUND: Oligodendrocytes (OL) are the myelinating cells of the central nervous system. OL differentiation from oligodendrocyte progenitor cells (OPC) is accompanied by characteristic stereotypical morphological changes. Quantitative imaging of those morphological alterations during OPC differentiation is commonly used for characterization of new molecules in cell differentiation and myelination and screening of new pro-myelinating drugs. Current available imaging analysis methods imply a non-automated morphology assessment, which is time-consuming and prone to user subjective evaluation...
November 21, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29171339/fidelity-of-occupational-performance-coaching-importance-of-accuracy-in-intervention-identification
#10
Fiona Graham, Jenny Ziviani, Ann Kennedy-Behr, Dorothy Kessler, Caroline Hui
Establishing fidelity processes and measures is an important step in the development of interventions. Accurate referencing, naming of interventions and robust discussion of deviations from the theories, methods or terminology underpinning interventions support the fidelity of future applications of interventions in research and clinical settings. This commentary clarifies the establishment of fidelity for Occupational Performance Coaching (OPC) in relation to a recent article on this topic by Dunn and colleagues...
November 1, 2017: OTJR: Occupation, Participation and Health
https://www.readbyqxmd.com/read/29167725/transdifferentiation-of-human-dental-pulp-stem-cells-into-oligoprogenitor-cells
#11
Ardeshir Moayeri, Maryam Nazm Bojnordi, Sara Haratizadeh, Amir Esmaeilnejad-Moghadam, Rafieh Alizadeh, Hatef Ghasemi Hamidabadi
Introduction: The nerve fibers in central nervous system are surrounded by myelin sheet which is formed by oligodendrocytes. Cell therapy based on oligodendrocytes and their precursors transplantation can hold a promising alternative treatment for myelin sheet repair in demyelinating diseases. Methods: Human Dental Pulp Stem Cells (hDPSCs) are noninvasive, autologous and easy available source with multipotency characteristics, so they are in focus of interest in regenerative medicine...
September 2017: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/29161318/loss-of-mtorc2-signaling-in-oligodendrocyte-precursor-cells-delays-myelination
#12
Mark D Grier, Kathryn L West, Nathaniel D Kelm, Cary Fu, Mark D Does, Brittany Parker, Eleanor McBrier, Andre H Lagrange, Kevin C Ess, Robert P Carson
Myelin abnormalities are increasingly being recognized as an important component of a number of neurologic developmental disorders. The integration of many signaling pathways and cell types are critical for correct myelinogenesis. The PI3-K and mechanistic target of rapamycin (mTOR) pathways have been found to play key roles. mTOR is found within two distinct complexes, mTORC1 and mTORC2. mTORC1 activity has been shown to play a major role during myelination, while the role of mTORC2 is not yet well understood...
2017: PloS One
https://www.readbyqxmd.com/read/29151068/crataegus-special-extract-ws-1442-up-to-date-review-of-experimental-and-clinical-experiences
#13
M Zorniak, B Szydlo, T F Krzeminski
Extracts and tinctures made from Crataegus spp. (Hawthorn) have been used as cardioprotective remedies since ancient times. WS 1442 special extract, manufactured by Dr. W. Schwabe Pharmaceuticals©, made from Crataegus spp. Leaves and flowers is one of the most studied and popular of preparations received from Hawthorn. It is integral, and most important active component of such herbal drugs as Crataegutt® novo 450, and CardioMax®. This standardized extract contains 18.75% oligomeric procyanidins (OPC), which have beneficial cardioprotective values and play a role as free-radicals scavengers, that protect the ischemic heart tissue from neutrophile elastase action successions...
August 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/29149493/impact-of-chronic-hepatitis-c-virus-infection-on-the-survival-of-patients-with-oropharyngeal-cancer
#14
Minas P Economides, Moran Amit, Parag S Mahale, Jeff J Hosry, Ying Jiang, Uddalak Bharadwaj, Erich M Sturgis, Harrys A Torres
BACKGROUND: Although an association between hepatitis C virus (HCV) infection and oropharyngeal cancers (OPCs) has been reported, to the authors' knowledge the clinical significance of this epidemiological finding remains unknown. Therefore, the authors analyzed the oncologic outcomes of HCV-infected patients with OPCs. METHODS: In this retrospective cohort study, all patients with OPCs who were seen at The University of Texas MD Anderson Cancer Center between January 2004 and December 2015 were reviewed...
November 17, 2017: Cancer
https://www.readbyqxmd.com/read/29146291/development-of-ms-binding-assays-targeting-the-binding-site-of-mb327-at-the-nicotinic-acetylcholine-receptor
#15
S Sichler, G Höfner, S Rappenglück, T Wein, K V Niessen, T Seeger, F Worek, H Thiermann, F F Paintner, K T Wanner
The bispyridinium compound MB327 has been shown previously to have a positive pharmacological effect against poisoning with organophosphorous compounds (OPCs). The mechanism by which it exerts its therapeutic effect seems to be directly mediated by the nicotinic acetylcholine receptor (nAChR). In the present study, the development of mass spectrometry based binding assays (MS Binding Assays) for characterization of the binding site of MB327 at the nAChR from Torpedo californica is described. MS Binding Assays follow the principle of radioligand binding assays, but do not, in contrast to the latter, require a radiolabeled reporter ligand, as the readout is in this case based on mass spectrometric detection...
November 13, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29140428/hpv-negative-but-not-hpv-positive-oropharyngeal-carcinomas-induce-fibroblasts-to-support-tumour-invasion-through-micro-environmental-release-of-hgf-and-il-6
#16
Robert Bolt, Bernadette Foran, Craig Murdoch, Daniel W Lambert, Sally Thomas, Keith D Hunter
Human papillomavirus (HPV) infection is causally related to a subset of oropharyngeal carcinomas (OPC) and is linked to a more favourable prognosis compared to HPV-negative OPC. The mechanisms underlying this effect on prognosis are not fully understood, but interactions with the tumour microenvironment may be pivotal. Here, we investigated the role of the tumour microenvironment in HPV-positive compared to HPV-negative cancer using 2D and 3D modelling of OPC interactions with stromal fibroblasts. HPV-negative, but not HPV-positive, OPC-derived cell lines induced a rapid fibroblast secretory response that supported 2D cancer cell migration and invasion in vitro...
November 13, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/29136017/practices-in-security-and-confidentiality-of-hiv-aids-patients-information-a-national-survey-among-staff-at-hiv-outpatient-clinics-in-vietnam
#17
Nguyen Khac Hai, Saranath Lawpoolsri, Podjanee Jittamala, Phan Thi Thu Huong, Jaranit Kaewkungwal
INTRODUCTION: Breach of confidentiality or invasion of privacy from the collection and use of medical records, particularly those of patients with HIV/AIDS or other diseases sensitive to stigmatization, should be prevented by all related stakeholders in healthcare settings. The main focus of this study was to assess practices regarding security and confidentiality of HIV-related information among staff at HIV outpatient clinics (HIV-OPCs) in Vietnam. METHODS: A descriptive cross-sectional study was conducted at all 312 HIV-OPCs across the country using an online survey technique...
2017: PloS One
https://www.readbyqxmd.com/read/29134703/origin-and-dynamics-of-oligodendrocytes-in-the-developing-brain-implications-for-perinatal-white-matter-injury
#18
REVIEW
Erik van Tilborg, Caroline G M de Theije, Maurik van Hal, Nienke Wagenaar, Linda S de Vries, Manon J Benders, David H Rowitch, Cora H Nijboer
Infants born prematurely are at high risk to develop white matter injury (WMI), due to exposure to hypoxic and/or inflammatory insults. Such perinatal insults negatively impact the maturation of oligodendrocytes (OLs), thereby causing deficits in myelination. To elucidate the precise pathophysiology underlying perinatal WMI, it is essential to fully understand the cellular mechanisms contributing to healthy/normal white matter development. OLs are responsible for myelination of axons. During brain development, OLs are generally derived from neuroepithelial zones, where neural stem cells committed to the OL lineage differentiate into OL precursor cells (OPCs)...
November 14, 2017: Glia
https://www.readbyqxmd.com/read/29131145/metabolomics-based-discovery-of-a-metabolite-that-enhances-oligodendrocyte-maturation
#19
Brittney A Beyer, Mingliang Fang, Benjamin Sadrian, J Rafael Montenegro-Burke, Warren C Plaisted, Bernard P C Kok, Enrique Saez, Toru Kondo, Gary Siuzdak, Luke L Lairson
Endogenous metabolites play essential roles in the regulation of cellular identity and activity. Here we have investigated the process of oligodendrocyte precursor cell (OPC) differentiation, a process that becomes limiting during progressive stages of demyelinating diseases, including multiple sclerosis, using mass-spectrometry-based metabolomics. Levels of taurine, an aminosulfonic acid possessing pleotropic biological activities and broad tissue distribution properties, were found to be significantly elevated (∼20-fold) during the course of oligodendrocyte differentiation and maturation...
November 13, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/29126910/impaired-oligodendrogenesis-and-myelination-by-elevated-s100b-levels-during-neurodevelopment
#20
Gisela Santos, Andreia Barateiro, Cláudio M Gomes, Dora Brites, Adelaide Fernandes
High levels of the inflammatory molecule S100B protein have been identified in sera from several perinatal inflammatory conditions involving myelin damage and associated with an adverse prognosis or the emergence of sequelea. S100B is essential for oligodendrocyte (OL) differentiation and maturation, but it remains to be established if excessive levels of released S100B upon early brain injury are deleterious in the neurodevelopmental period. Here, we investigated this possibility by evaluating how elevated S100B affects oligodendrogenesis during this period...
November 8, 2017: Neuropharmacology
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