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https://www.readbyqxmd.com/read/28446066/a-novel-three-dimensional-culture-system-for-oligodendrocyte-precursor-cells
#1
Naohiro Egawa, Akihiro Shindo, Anna C Liang, Yang Du, Changhong Xing, Evan K Lo, Kanako Itoh, Hisanori Kinoshita, Takakuni Maki, Ryosuke Takahashi, Ryo Sudo, Myron Spector, Josephine Lok, Ken Arai
Oligodendrocytes are generated from oligodendrocyte precursor cells (OPCs). Mechanisms of OPC differentiation have been extensively examined with two-dimensional (2D) cell culture systems. However, these cellular events may be more accurately represented using a three-dimensional (3D) model. Here, we report the development of a novel 3D OPC culture system using gels composed of a mixture of collagen and hyaluronan, wherein cultured rat primary OPCs can proliferate and differentiate into oligodendrocytes. Our data show that the gel concentration and cell seeding density are critical factors for the numbers of OPCs and oligodendrocytes in our 3D culture system...
April 27, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28442994/egf-enhances-oligodendrogenesis-from-glial-progenitor-cells
#2
Junlin Yang, Xuejun Cheng, Jiajun Qi, Binghua Xie, Xiaofeng Zhao, Kang Zheng, Zunyi Zhang, Mengsheng Qiu
Emerging evidence indicates that epidermal growth factor (EGF) signaling plays a positive role in myelin development and repair, but little is known about its biological effects on the early generation and differentiation of oligodendrocyte (OL) lineage cells. In this study, we investigated the role of EGF in early OL development with isolated glial restricted precursor (GRP) cells. It was found that EGF collaborated with Platelet Derived Growth Factor-AA (PDGFaa) to promote the survival and self-renewal of GRP cells, but predisposed GRP cells to develop into O4(-) early-stage oligodendrocyte precursor cells (OPCs) in the absence of or PDGFaa...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28442356/unbiased-stereological-analysis-of-the-fate-of-oligodendrocyte-progenitor-cells-in-the-adult-mouse-brain-and-effect-of-reference-memory-training
#3
Jenna J Boulanger, Claude Messier
Oligodendrocyte progenitor cells (OPC) are glial cells that differentiate into myelinating oligodendrocytes during early stages of post-natal life. However, OPCs persist beyond developmental myelination and represent an important population of cycling cells in the grey and white matter of the adult brain. Here, we used unbiased systematic stereological analysis to determine the total number of OPCs in the neocortex and corpus callosum of the adult mouse. We found that the ratio of OPCs to neurons is of 1: 10 in the adult neocortex...
April 22, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28437708/primary-secondary-and-tertiary-prevention-of-human-papillomavirus-driven-head-and-neck-cancers
#4
REVIEW
Haïtham Mirghani, Alain C Jung, Carole Fakhry
Human papillomavirus (HPV)-driven oropharyngeal cancers (OPCs) represent an increasing proportion of head and neck cancers that could become, in the next few decades, a public health problem in certain western countries. This significant epidemiological change strongly calls for preventive measures. Prophylactic HPV vaccination and screening programmes for early identification and treatment of premalignant lesions are currently being used to reduce the incidence of uterine cervical cancer, which is the paradigm of HPV-driven malignancy...
April 19, 2017: European Journal of Cancer
https://www.readbyqxmd.com/read/28437210/factors-associated-with-length-of-stay-at-home-in-the-final-month-of-life-among-advanced-cancer-patients-a-retrospective-chart-review
#5
Masatomo Otsuka
BACKGROUND: Living at home is an important factor for maintaining high quality of life among patients. Many studies have discussed parameters associated with place of death, but no studies have yet clarified which factors influence the length of stay at home during the end of life. OBJECTIVE: The aim of this study was to identify factors influencing the amount of time spent at home during the final month of life among patients with advanced cancer. METHODS: A retrospective chart review was conducted for 415 patients with advanced cancer...
February 28, 2017: Journal of Palliative Medicine
https://www.readbyqxmd.com/read/28435980/-glial-cells-function-as-neural-stem-cells-and-progenitor-cells
#6
Zi-Jian Tan, Shu-Hui Ju, Xiao Huang, Ya-Kun Gu, Zhi-Da Su
Glial cells, including astrocytes, oligodendrocyte progenitor cells (OPCs), NG2-glia, etc, are broadly distributed throughout the central nervous system (CNS). Also, it has been well known that glial cells play multi-roles in physiological and pathological processes in the CNS, such as maintaining homeostasis, providing neurotrophins for neurons and regulating neural signal transmission. Recently, increasing evidence showed that glial cells may also function as neural stem/progenitor cells and contribute to adult neurogenesis or neuroregeneration...
April 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/28432293/quiescence-of-adult-oligodendrocyte-precursor-cells-requires%C3%A2-thyroid-hormone-and-hypoxia-to-activate-runx1
#7
Yasuhito Tokumoto, Shinpei Tamaki, Yasuaki Kabe, Keiyo Takubo, Makoto Suematsu
The adult mammalian central nervous system (CNS) contains a population of slowly dividing oligodendrocyte precursor cells (OPCs), i.e., adult OPCs, which supply new oligodendrocytes throughout the life of animal. While adult OPCs develop from rapidly dividing perinatal OPCs, the mechanisms underlying their quiescence remain unknown. Here, we show that perinatal rodent OPCs cultured with thyroid hormone (TH) under hypoxia become quiescent and acquire adult OPCs-like characteristics. The cyclin-dependent kinase inhibitor p15/INK4b plays crucial roles in the TH-dependent cell cycle deceleration in OPCs under hypoxia...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28431302/quality-of-life-in-survivors-of-oropharyngeal-cancer-a%C3%A2-systematic-review-and-meta-analysis-of-1366-patients
#8
REVIEW
Sanne Høxbroe Michaelsen, Christian Grønhøj, Jacob Høxbroe Michaelsen, Jeppe Friborg, Christian von Buchwald
Human papillomavirus (HPV)-associated oropharyngeal cancer (OPC) is rapidly increasing in incidence and has a favourable prognosis compared with HPV-negative disease. Current combined therapies include significant risks of morbidity for the growing group of survivors. This systematic review and meta-analysis investigates how treatment affects quality of life (QoL) in survivors of oropharyngeal cancer. PubMed, EMBASE and the Cochrane Library were systematically searched for all studies reporting patient-assessed QoL at least 1 year after treatment for OPC...
April 18, 2017: European Journal of Cancer
https://www.readbyqxmd.com/read/28422628/occupational-performance-coaching-for-stroke-survivors-a-pilot-randomized-controlled-trial
#9
Dorothy Kessler, Mary Egan, Claire-Jehanne Dubouloz, Sara McEwen, Fiona P Graham
OBJECTIVE: We examined the feasibility of study procedures and explored the potential efficacy of Occupational Performance Coaching for stroke survivors (OPC-Stroke), an intervention designed to improve participation after stroke. METHOD: In this pilot randomized controlled trial, 21 participants were randomized to receive the intervention or usual care. Recruitment, retention, and outcome completion rates were calculated. Direction of change and effect sizes were examined for the outcomes of participation, goal performance and satisfaction, goal self-efficacy, emotional well-being, and cognition...
May 2017: American Journal of Occupational Therapy: Official Publication of the American Occupational Therapy Association
https://www.readbyqxmd.com/read/28407735/telbivudine-treatment-started-in-early-and-middle-pregnancy-completely-blocks-hbv-vertical-transmission
#10
Weihui Sun, Shangfei Zhao, Lei Ma, Anhua Hao, Bo Zhao, Lin Zhou, Fengzhu Li, Mingquan Song
BACKGROUND: To evaluate the efficacy and safety of treating HBV-positive mothers with telbivudine in early and middle pregnancy to prevent mother-to-infant HBV transmission. METHODS: The subject population comprised pregnant women with chronic hepatitis B (CHB; n = 188) from January 2013 to June 2015, with HBV DNA ≥1.0 × 10(7)copies/mL and increased alanine aminotransferase levels. Groups A (n = 62) and B (n = 61) were treated with telbivudine starting at 12 weeks or 20-28 weeks after gestation, respectively...
April 13, 2017: BMC Gastroenterology
https://www.readbyqxmd.com/read/28405099/tba-for-ot-hhc-vs-opc-f-u
#11
EDITORIAL
Herbert L Fred
No abstract text is available yet for this article.
April 2017: Proceedings of the Baylor University Medical Center
https://www.readbyqxmd.com/read/28405003/surpassing-light-induced-cell-damage-in-vitro-with-novel-cell-culture-media
#12
John H Stockley, Kimberley Evans, Moritz Matthey, Katrin Volbracht, Sylvia Agathou, Jana Mukanowa, Juan Burrone, Ragnhildur T Káradóttir
Light is extensively used to study cells in real time (live cell imaging), separate cells using fluorescence activated cell sorting (FACS) and control cellular functions with light sensitive proteins (Optogenetics). However, photo-sensitive molecules inside cells and in standard cell culture media generate toxic by-products that interfere with cellular functions and cell viability when exposed to light. Here we show that primary cells from the rat central nervous system respond differently to photo-toxicity, in that astrocytes and microglia undergo morphological changes, while in developing neurons and oligodendrocyte progenitor cells (OPCs) it induces cellular death...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28402675/mechanistic-insight-into-the-molecular-tio2-mediated-gas-phase-detoxication-of-dmmp-a-theoretical-approach
#13
Tamalika Ash, Tanay Debnath, Avik Ghosh, Abhijit Kr Das
The detoxication of DMMP (Dimethyl methylphosphonate) mediated by molecular TiO2 has been investigated computationally using density functional theory (DFT). From our previous studies, it is evident that the unimolecular detoxication of OPCs (Organophosphorus compound) is kinetically unfeasible at room temperature due to significantly high activation barrier. Thus, the aim of our work is to find out whether molecular TiO2 can make any significant impact on the kinetic feasibility of the detoxication processes or not...
April 12, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28400715/doublecortin-in-oligodendrocyte-precursor-cells-in-the-adult-mouse-brain
#14
Jenna J Boulanger, Claude Messier
Key Points Oligodendrocyte precursor cells express doublecortin, a microtubule-associated protein.Oligodendrocyte precursor cells express doublecortin, but at a lower level of expression than in neuronal precursor.Doublecortin is not associated with a potential immature neuronal phenotype in Oligodendrocyte precursor cells. Oligodendrocyte precursor cells (OPC) are glial cells that differentiate into myelinating oligodendrocytes during embryogenesis and early stages of post-natal life. OPCs continue to divide throughout adulthood and some eventually differentiate into oligodendrocytes in response to demyelinating lesions...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28398505/cortical-remyelination-is-heterogeneous-in-multiple-sclerosis
#15
Eva M M Strijbis, Evert-Jan Kooi, Paul van der Valk, Jeroen J G Geurts
Cortical lesions (CLs) are an important component of multiple sclerosis (MS) pathology; they correlate better with physical disability and cognitive impairment than white matter lesions (WMLs). Because remyelination can be extensive in CLs, we quantified remyelination in gray matter (GM) and white matter (WM), addressing oligodendrocyte (OGD) maturation state and clinical relevance of remyelination. Brain tissue samples from 21 chronic MS patients were immunohistochemically stained for myelin proteolipid protein, Olig2, which is strongly expressed in OGD precursor cells (OPCs), but weakly expressed in mature OGDs and other OGD markers...
April 7, 2017: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/28397339/recent-trends-in-oropharyngeal-cancer-funding-and-public-interest
#16
Michael A Blasco, Peter F Svider, Troy Tenbrunsel, Gautham Vellaichamy, George H Yoo, Andrew M Fribley, S Naweed Raza
OBJECTIVES/HYPOTHESIS: The incidence of oropharyngeal cancer (OPC) has increased in the United States. This has been driven by an increase in human papillomavirus (HPV)-positive OPC. Our objective is to determine trends in National Institutes (NIH)-supported research funding and public interest in OPC. METHODS: The NIH Research Portfolio Online Reporting Tools database was evaluated for projects related to OPC between 2004 and 2015. Projects were evaluated for total funding, relation to HPV, principal investigator departmental affiliation and degree, and NIH agency or center responsible for grant...
April 11, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28394207/the-effects-of-social-anxiety-and-online-privacy-concern-on-individual-differences-in-internet-based-interaction-anxiety-and-communication-preferences
#17
Krystelle Shaughnessy, Jessica N Rocheleau, Somayyeh Kamalou, David A Moscovitch
Social anxiety (SA) and online privacy concerns (OPCs) are conceptually distinct fears, but both may be activated by Internet-based social contexts. Whereas SA is focused on being the object of interpersonal evaluation, OPC is focused on preventing others from gaining unauthorized access to private personal information. No research to date has investigated how SA and OPCs may uniquely or interactively predict individual differences in online interaction anxiety or attitudes and preferences about online communication...
April 2017: Cyberpsychology, Behavior and Social Networking
https://www.readbyqxmd.com/read/28389474/perineurial-glial-plasticity-and-the-role-of-tgf-%C3%AE-in-the-development-of-the-blood-nerve-barrier
#18
Angela D Morris, Gwendolyn M Lewis, Sarah Kucenas
Precisely orchestrated interactions between spinal motor axons and their ensheathing glia are vital for forming and maintaining functional spinal motor nerves. Following perturbations to peripheral myelinating glial cells, centrally-derived oligodendrocyte progenitor cells (OPCs) ectopically exit the spinal cord and myelinate peripheral nerves in myelin with central nervous system (CNS) characteristics. However, whether remaining peripheral ensheathing glia, such as perineurial glia, properly encase the motor nerve despite this change in glial cell and myelin composition, remains unknown...
April 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28387380/a-staged-screening-of-registered-drugs-highlights-remyelinating-drug-candidates-for-clinical-trials
#19
C Eleuteri, S Olla, C Veroni, R Umeton, R Mechelli, S Romano, M C Buscarinu, F Ferrari, G Calò, G Ristori, M Salvetti, C Agresti
There is no treatment for the myelin loss in multiple sclerosis, ultimately resulting in the axonal degeneration that leads to the progressive phase of the disease. We established a multi-tiered platform for the sequential screening of drugs that could be repurposed as remyelinating agents. We screened a library of 2,000 compounds (mainly Food and Drug Administration (FDA)-approved compounds and natural products) for cellular metabolic activity on mouse oligodendrocyte precursors (OPC), identifying 42 molecules with significant stimulating effects...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28380769/optical-back-propagation-for-fiber-optic-networks-with-hybrid-edfa-raman-amplification
#20
Xiaojun Liang, Shiva Kumar
We have investigated an optical back propagation (OBP) method to compensate for propagation impairments in fiber optic networks with lumped Erbium doped fiber amplifier (EDFA) and/or distributed Raman amplification. An OBP module consists of an optical phase conjugator (OPC), optical amplifiers and dispersion varying fibers (DVFs). We derived a semi-analytical expression that calculates the dispersion profile of DVF. The OBP module acts as a nonlinear filter that fully compensates for the nonlinear distortions due to signal propagation in a transmission fiber, and is applicable for fiber optic networks with reconfigurable optical add-drop multiplexers (ROADMs)...
March 6, 2017: Optics Express
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