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https://www.readbyqxmd.com/read/28920094/convolutional-auto-encoder-for-image-denoising-of-ultra-low-dose-ct
#1
Mizuho Nishio, Chihiro Nagashima, Saori Hirabayashi, Akinori Ohnishi, Kaori Sasaki, Tomoyuki Sagawa, Masayuki Hamada, Tatsuo Yamashita
OBJECTIVES: The purpose of this study was to validate a patch-based image denoising method for ultra-low-dose CT images. Neural network with convolutional auto-encoder and pairs of standard-dose CT and ultra-low-dose CT image patches were used for image denoising. The performance of the proposed method was measured by using a chest phantom. MATERIALS AND METHODS: Standard-dose and ultra-low-dose CT images of the chest phantom were acquired. The tube currents for standard-dose and ultra-low-dose CT were 300 and 10 mA, respectively...
August 2017: Heliyon
https://www.readbyqxmd.com/read/28916551/genetic-determinants-of-radiographic-knee-osteoarthritis-in-african-americans
#2
Youfang Liu, Michelle S Yau, Laura M Yerges-Armstrong, David J Duggan, Jordan B Renner, Marc C Hochberg, Braxton D Mitchell, Rebecca D Jackson, Joanne M Jordan
OBJECTIVE: The etiology of knee osteoarthritis (OA), the most common form of arthritis, is complex and may differ by race or ethnicity. In recent years, genetic studies have identified many genetic variants associated with OA, but nearly all the studies were conducted in European whites and Asian Americans. Few studies have focused on the genetics of knee OA in African Americans. METHODS: We performed a genome-wide association study of radiographic knee OA in 1217 African Americans from 2 North American cohort studies: 590 subjects from the Johnston County Osteoarthritis Project and 627 subjects from the Osteoarthritis Initiative...
September 15, 2017: Journal of Rheumatology
https://www.readbyqxmd.com/read/28904822/a-parental-perspective-concerning-barriers-to-care-for-neural-tube-defects-in-china
#3
Andrew Campion, Clement Lee, Nan Bao, Jorge Lazareff
BACKGROUND: The People's Republic of China (PRC) has the highest incidence of neural tube defects (NTDs) in the world. NTDs remain a significant contributor to the global burden of disease amendable to surgical care; however, no studies to date have evaluated the patients' perspective regarding perceived barriers to care. METHODS: The study was conducted at the Shanghai Children's Medical Center (SCMC) between 6/11/2014 and 7/17/2014. Surveys were administered to families presenting to the clinic of the SCMC director for Pediatric Neurosurgery...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28904534/three-dimensional-organoid-system-transplantation-technologies-in-future-treatment-of-central-nervous-system-diseases
#4
REVIEW
NaiLi Wei, ZiFang Quan, Hailiang Tang, JianHong Zhu
In recent years, scientists have made great achievements in understanding the development of human brain and elucidating critical elements of stepwise spatiotemporal control strategies in neural stem cell specification lineage, which facilitates successful induction of neural organoid in vitro including the cerebral cortex, cerebellar, neural tube, hippocampus cortex, pituitary, and optic cup. Besides, emerging researches on neural organogenesis promote the application of 3D organoid system transplantation in treating central nervous system (CNS) diseases...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28903938/atrial-fibrillation-in-acute-obstructive-sleep-apnea-autonomic-nervous-mechanism-and-modulation
#5
Lilei Yu, Xuefei Li, Bing Huang, Xiaoya Zhou, Menglong Wang, Liping Zhou, Guannan Meng, Yuhong Wang, Zhenya Wang, Jielin Deng, Hong Jiang
BACKGROUND: The mechanisms of atrial fibrillation (AF) induced by obstructive sleep apnea (OSA) are not completely understood. This study investigated the roles of the intrinsic and extrinsic cardiac autonomic nervous system in OSA-induced AF and provided noninvasive autonomic nervous modulation for the suppression of OSA-induced AF by using low-level transcutaneous electrical stimulation (LL-TS) of the auricular branch of the vagus nerve at the tragus. METHODS AND RESULTS: Eighteen dogs received tracheostomy under general anesthesia and were randomly divided into 3 groups: the OSA group (OSA was simulated via clamping of the endotracheal tube at end expiration for 1...
September 13, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28901030/treating-osa-current-and-emerging-therapies-beyond-cpap
#6
REVIEW
Geraldo Lorenzi-Filho, Fernanda R Almeida, Patrick J Strollo
Continuous positive airway pressure (CPAP) is the standard treatment for moderate-to-severe obstructive sleep apnoea (OSA). However, adherence to CPAP is limited and non-CPAP therapies are frequently explored. Oral appliance (OA) therapy is currently widely used for the treatment of snoring, mild, moderate and severe OSA. The most commonly used and studied OA consists of a maxillary and mandibular splint which hold the lower jaw forward during sleep. The efficacy of OA is inferior to CPAP; however, the effectiveness as measured by sleepiness, quality of life, endothelial function and blood pressure is similar likely due to higher acceptance and subjective adherence...
September 12, 2017: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/28898253/engineering-human-cell-spheroids-to-model-embryonic-tissue-fusion-in-vitro
#7
David G Belair, Cynthia J Wolf, Carmen Wood, Hongzu Ren, Rachel Grindstaff, William Padgett, Adam Swank, Denise MacMillan, Anna Fisher, Witold Winnik, Barbara D Abbott
Epithelial-mesenchymal interactions drive embryonic fusion events during development, and perturbations of these interactions can result in birth defects. Cleft palate and neural tube defects can result from genetic defects or environmental exposures during development, yet very little is known about the effect of chemical exposures on fusion events during human development because of a lack of relevant and robust human in vitro assays of developmental fusion behavior. Given the etiology and prevalence of cleft palate and the relatively simple architecture and composition of the embryonic palate, we sought to develop a three-dimensional culture system that mimics the embryonic palate and could be used to study fusion behavior in vitro using human cells...
2017: PloS One
https://www.readbyqxmd.com/read/28894244/impact-of-protein-o-glcnacylation-on-neural-tube-malformation-in-diabetic-embryopathy
#8
Gyuyoup Kim, Lixue Cao, E Albert Reece, Zhiyong Zhao
Diabetes mellitus in early pregnancy can cause neural tube defects (NTDs) in embryos by perturbing protein activity, causing cellular stress, and increasing programmed cell death (apoptosis) in the tissues required for neurulation. Hyperglycemia augments a branch pathway in glycolysis, the hexosamine biosynthetic pathway (HBP), to increase uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc). GlcNAc can be added to proteins by O-GlcNAc transferase (OGT) to regulate protein activity. In the embryos of diabetic mice, OGT is highly activated in association with increases in global protein O-GlcNAcylation...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28885600/a-cross-sectional-study-of-dietary-and-genetic-predictors-of-blood-folate-levels-in-healthy-young-adults
#9
Daniel Cummings, Kevin F Dowling, Noah J Silverstein, Alexandra S Tanner, Hamdi Eryilmaz, Jordan W Smoller, Joshua L Roffman
Since 1998, the U.S. has mandated folic acid (FA) fortification of certain grain products to reduce the risk of neural tube defects. Folate intake and red blood cell (RBC) folate concentrations increased substantially post-intervention, although recent studies raise concerns about the level of ongoing benefit. This study investigated blood folate level determinants in healthy young adults, including intake of naturally occurring food folate, synthetic FA, and the interaction of naturally occurring food folate with a common missense variant in the FOLH1 gene thought to affect absorption...
September 8, 2017: Nutrients
https://www.readbyqxmd.com/read/28879493/neural-progenitor-cells-undergoing-yap-tead-mediated-enhanced-self-renewal-form-heterotopias-more-easily-in-the-diencephalon-than-in-the-telencephalon
#10
Kanako Saito, Ryotaro Kawasoe, Hiroshi Sasaki, Ayano Kawaguchi, Takaki Miyata
Spatiotemporally ordered production of cells is essential for brain development. Normally, most undifferentiated neural progenitor cells (NPCs) face the apical (ventricular) surface of embryonic brain walls. Pathological detachment of NPCs from the apical surface and their invasion of outer neuronal territories, i.e., formation of NPC heterotopias, can disrupt the overall structure of the brain. Although NPC heterotopias have previously been observed in a variety of experimental contexts, the underlying mechanisms remain largely unknown...
September 6, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28879386/unjoined-primary-and-secondary-neural-tubes-junctional-neural-tube-defect-a-new-form-of-spinal-dysraphism-caused-by-disturbance-of-junctional-neurulation
#11
(no author information available yet)
No abstract text is available yet for this article.
October 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28875454/roles-of-retinoic-acid-signaling-in-shaping-the-neuronal-architecture-of-the-developing-amphioxus-nervous-system
#12
Elisabeth Zieger, Simona Candiani, Greta Garbarino, Jenifer C Croce, Michael Schubert
The morphogen retinoic acid (RA) patterns vertebrate nervous systems and drives neurogenesis, but how these functions evolved remains elusive. Here, we show that RA signaling plays stage- and tissue-specific roles during the formation of neural cell populations with serotonin, dopamine, and GABA neurotransmitter phenotypes in amphioxus, a proxy for the ancestral chordate. Our data suggest that RA signaling restricts the specification of dopamine-containing cells in the ectoderm and of GABA neurons in the neural tube, probably by regulating Hox1 and Hox3 gene expression, respectively...
September 5, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28873613/simple-coupled-ultrahigh-performance-liquid-chromatography-and-ion-chromatography-technique-for-simultaneous-determination-of-folic-acid-and-inorganic-anions-in-folic-acid-tablets
#13
Fenglian Wang, Minyi Cao, Nani Wang, Nadeem Muhammad, Shuchao Wu, Yan Zhu
Folic acid plays a significant role during periods of rapid cells division and growth. Pregnant women require folic acid daily, either from dietary supplements or folic acid tablets in order to prevent fetal neural tube defects. In this work, a simple coupled ultrahigh performance liquid chromatography and ion chromatography technique was developed for simultaneous determination of folic acid and inorganic anions in folic acid tablets. A reversed-phase C18 column was used as the pretreatment column for on-line separating inorganic anions from organics...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28865949/valproic-acid-increases-nf-%C3%AE%C2%BAb-transcriptional-activation-despite-decreasing-dna-binding-ability-in-p19-cells-which-may-play-a-role-in-vpa-initiated-teratogenesis
#14
Christina L Lamparter, Nicola A Philbrook, Louise M Winn
The nuclear factor-kappa B (NF-κB) family of transcription factors regulate gene expression in response to diverse stimuli. We previously demonstrated that valproic acid (VPA) exposure in utero decreases total cellular protein expression of the NF-κB subunit p65 in CD-1 mouse embryos with a neural tube defect but not in phenotypically normal littermates. This study evaluated p65 mRNA and protein expression in P19 cells and determined the impact on DNA binding ability and activity. Exposure to 5mM VPA decreased p65 mRNA and total cellular protein expression however, nuclear p65 protein expression was unchanged...
September 1, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28863786/prdm13-forms-a-feedback-loop-with-ptf1a-and-is-required-for-glycinergic-amacrine-cell-genesis-in-the-xenopus-retina
#15
Nathalie Bessodes, Karine Parain, Odile Bronchain, Eric J Bellefroid, Muriel Perron
BACKGROUND: Amacrine interneurons that modulate synaptic plasticity between bipolar and ganglion cells constitute the most diverse cell type in the retina. Most are inhibitory neurons using either GABA or glycine as neurotransmitters. Although several transcription factors involved in amacrine cell fate determination have been identified, mechanisms underlying amacrine cell subtype specification remain to be further understood. The Prdm13 histone methyltransferase encoding gene is a target of the transcription factor Ptf1a, an essential regulator of inhibitory neuron cell fate in the retina...
September 1, 2017: Neural Development
https://www.readbyqxmd.com/read/28862178/spectrum-of-prenatally-detected-central-nervous-system-malformations-neural-tube-defects-continue-to-be-the-leading-foetal-malformation
#16
Anjurani Siddesh, Geetika Gupta, Ram Sharan, Meenal Agarwal, Shubha R Phadke
BACKGROUND & OBJECTIVES: Prenatal diagnosis of malformations is an important method of prevention and control of congenital anomalies with poor prognosis. Central nervous system (CNS) malformations amongst these are the most common. The information about the prevalence and spectrum of prenatally detected malformations is crucial for genetic counselling and policymaking for population-based preventive programmes. The objective of this study was to study the spectrum of prenatally detected CNS malformations and their association with chromosomal abnormalities and autopsy findings...
April 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/28859338/human-brain-abnormalities-associated-with-prenatal-alcohol-exposure-and-fetal-alcohol-spectrum-disorder
#17
Jessica S Jarmasz, Duaa A Basalah, Albert E Chudley, Marc R Del Bigio
Fetal alcohol spectrum disorder (FASD) is a common neurodevelopmental problem, but neuropathologic descriptions are rare and focused on the extreme abnormalities. We conducted a retrospective survey (1980-2016) of autopsies on 174 individuals with prenatal alcohol exposure or an FASD diagnosis. Epidemiologic details and neuropathologic findings were categorized into 5 age groups. Alcohol exposure was difficult to quantify. When documented, almost all mothers smoked tobacco, many abused other substances, and prenatal care was poor or nonexistent...
September 1, 2017: Journal of Neuropathology and Experimental Neurology
https://www.readbyqxmd.com/read/28851604/regulatory-logic-underlying-diversification-of-the-neural-crest
#18
REVIEW
Megan L Martik, Marianne E Bronner
The neural crest is a transient, multipotent population of cells that arises at the border of the developing nervous system. After closure of the neural tube, these cells undergo an epithelial-to-mesenchymal transition (EMT) to delaminate and migrate, often to distant locations in the embryo. Neural crest cells give rise to a diverse array of derivatives including neurons and glia of the peripheral nervous system, melanocytes, and bone and cartilage of the face. A gene regulatory network (GRN) controls the specification, delamination, migration, and differentiation of this fascinating cell type...
August 26, 2017: Trends in Genetics: TIG
https://www.readbyqxmd.com/read/28844822/diet-and-fertility-a-review
#19
REVIEW
Audrey J Gaskins, Jorge E Chavarro
The literature on the relationship between diet and human fertility has greatly expanded over the last decade, resulting in the identification of a few clear patterns. Intake of supplemental folic acid, particularly at doses higher than those recommended for the prevention of neural tube defects, has been consistently related to lower frequency of infertility, lower risk of pregnancy loss, and greater success in infertility treatment. On the other hand and despite promising evidence from animal models, vitamin D does not appear to exert an important role in human fertility in the absence of deficiency...
August 24, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28841576/diagnostic-value-of-perinatal-autopsies-analysis-of-486-cases
#20
Nalan Neşe, Yeşim Bülbül
AIM: Autopsy is a beneficial procedure to determine the cause of death and the frequency of anomalies in perinatal losses. Even in the event of an autopsy not providing any additional information, completion of the procedure confirming the clinical diagnoses gives reassurance to both clinicians and parents. Here we present a 15-year archival study based on findings of perinatal autopsies. DESIGN AND METHODS: Four hundred and eighty-six cases from our archive were reviewed and according to the findings they were divided into three subcategories; (1) miscarriages (MCF); (2) fetuses terminated (FTA) for vital anomalies detected by prenatal ultrasonography; (3) premature or term newborns died within first month of life (neonates: NN)...
August 25, 2017: Journal of Perinatal Medicine
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