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https://www.readbyqxmd.com/read/27933748/exploring-glucocorticoid-receptor-agonists-mechanism-of-action-through-mass-cytometry-and-radial-visualizations
#1
Yann Abraham, Bertran Gerrits, Marie-Gabrielle Ludwig, Michael Rebhan, Caroline Gubser Keller
Recent advances in combining flow cytometry and mass spectrometry have led to the development of mass cytometry, allowing for the interrogation of complex cell populations on an unprecedented scale. The volumes and high dimensionality of mass cytometry data pose significant challenges in terms of analysis and visualization. We implement a method called Radviz (1-3), where multidimensional single cell data can be visualized as a projection that maintains the original dimensions and data complexity whilst facilitating analysis and visualization...
December 9, 2016: Cytometry. Part B, Clinical Cytometry
https://www.readbyqxmd.com/read/27933672/single-neuron-activity-and-theta-modulation-in-the-posterior-parietal-cortex-in-a-visuospatial-attention-task
#2
Fang-Chi Yang, T K Jacobson, R D Burwell
The posterior parietal cortex (PPC) is implicated in directing and maintaining visual attention to locations in space. We hypothesized that the PPC also engages other cognitive processes in the transformation of behaviorally relevant visual inputs into appropriate actions, for example, monitoring of multiple locations, selection of responses to locations in space, and monitoring the outcome of response selections. We recorded single cells and local field potentials in the rat PPC during performance on a novel visuospatial attention (VSA) task that requires visually monitoring locations in space in order to make appropriate stimulus-guided locomotor responses...
December 9, 2016: Hippocampus
https://www.readbyqxmd.com/read/27933293/differences-in-the-mechanical-properties-of-the-developing-cerebral-cortical-proliferative-zone-between-mice-and-ferrets-at-both-the-tissue-and-single-cell-levels
#3
Arata Nagasaka, Tomoyasu Shinoda, Takumi Kawaue, Makoto Suzuki, Kazuaki Nagayama, Takeo Matsumoto, Naoto Ueno, Ayano Kawaguchi, Takaki Miyata
Cell-producing events in developing tissues are mechanically dynamic throughout the cell cycle. In many epithelial systems, cells are apicobasally tall, with nuclei and somata that adopt different apicobasal positions because nuclei and somata move in a cell cycle-dependent manner. This movement is apical during G2 phase and basal during G1 phase, whereas mitosis occurs at the apical surface. These movements are collectively referred to as interkinetic nuclear migration, and such epithelia are called "pseudostratified...
2016: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/27933292/nitric-oxide-modulates-postnatal-bone-marrow-derived-mesenchymal-stem-cell-migration
#4
John W Fuseler, Mani T Valarmathi
Nitric oxide (NO) is a small free-radical gas molecule, which is highly diffusible and can activate a wide range of downstream effectors, with rapid and widespread cellular effects. NO is a versatile signaling mediator with a plethora of cellular functions. For example, NO has been shown to regulate actin, the microfilament, dependent cellular functions, and also acts as a putative stem cell differentiation-inducing agent. In this study, using a wound-healing model of cellular migration, we have explored the effect of exogenous NO on the kinetics of movement and morphological changes in postnatal bone marrow-derived mesenchymal stem cells (MSCs)...
2016: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/27933191/genetics-of-inherited-cardiocutaneous-syndromes-a-review
#5
REVIEW
Tara Bardawil, Samar Khalil, Christina Bergqvist, Ossama Abbas, Abdul Ghani Kibbi, Fadi Bitar, Georges Nemer, Mazen Kurban
The life of a human being originates as a single cell which, under the influence of certain factors, divides sequentially into multiple cells that subsequently become committed to develop and differentiate into the different structures and organs. Alterations occurring early on in the development process may lead to fetal demise in utero. Conversely, abnormalities at later stages may result in structural and/or functional abnormalities of varying severities. The cardiovascular system and skin share certain developmental and structural factors; therefore, it is not surprising to find several inherited syndromes with both cardiac and skin manifestations...
2016: Open Heart
https://www.readbyqxmd.com/read/27932789/the-maintenance-ability-and-ca-2-availability-of-skeletal-muscle-are-enhanced-by-sildenafil
#6
Mei Huang, Keon Jin Lee, Kyung-Jin Kim, Mi Kyoung Ahn, Chung-Hyun Cho, Do Han Kim, Eun Hui Lee
Sildenafil relaxes vascular smooth muscle cells and is used to treat pulmonary artery hypertension as well as erectile dysfunction. However, the effectiveness of sildenafil on skeletal muscle and the benefit of its clinical use have been controversial, and most studies focus primarily on tissues and organs from disease models without cellular examination. Here, the effects of sildenafil on skeletal muscle at the cellular level were examined using mouse primary skeletal myoblasts (the proliferative form of skeletal muscle stem cells) and myotubes, along with single-cell Ca(2+) imaging experiments and cellular and biochemical studies...
December 9, 2016: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/27932552/microfluidic-analysis-of-oocyte-and-embryo-biomechanical-properties-to-improve-outcomes-in-assisted-reproductive-technologies
#7
REVIEW
Livia Z Yanez, David B Camarillo
Measurement of oocyte and embryo biomechanical properties has recently emerged as an exciting new approach to obtain a quantitative, objective estimate of developmental potential. However, many traditional methods for probing cell mechanical properties are time consuming, labor intensive and require expensive equipment. Microfluidic technology is currently making its way into many aspects of assisted reproductive technologies (ART), and is particularly well suited to measure embryo biomechanics due to the potential for robust, automated single-cell analysis at a low cost...
December 8, 2016: Molecular Human Reproduction
https://www.readbyqxmd.com/read/27932494/loss-of-a-doublecortin-dcx-domain-protein-causes-structural-defects-in-a-tubulin-based-organelle-of-toxoplasma-gondii-and-impairs-host-cell-invasion
#8
Eiji Nagayasu, Yu-Chen Hwang, Jun Liu, John M Murray, Ke Hu
The ∼6000 species in phylum Apicomplexa are single-celled obligate intracellular parasites. Their defining characteristic is the "apical complex", membranous and cytoskeletal elements at the apical end of the cell that participate in host-cell invasion. The apical complex of Toxoplasma gondii and some other apicomplexans includes a cone-shaped assembly, the "conoid", which (in T. gondii) comprises 14 spirally arranged fibers that are non-tubular polymers of tubulin. The tubulin dimers of the conoid fibers make canonical microtubules elsewhere in the same cell, suggesting that non-tubulin protein dictates their special arrangement in the conoid fibers...
December 8, 2016: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/27932455/single-cell-profiling-reveals-that-erna-accumulation-at-enhancer-promoter-loops-is-not-required-to-sustain-transcription
#9
Samir Rahman, Cornelia E Zorca, Tatiana Traboulsi, Emmanuel Noutahi, Matthew R Krause, Sylvie Mader, Daniel Zenklusen
Enhancers are intergenic DNA elements that regulate the transcription of target genes in response to signaling pathways by interacting with promoters over large genomic distances. Recent studies have revealed that enhancers are bi-directionally transcribed into enhancer RNAs (eRNAs). Using single-molecule fluorescence in situ hybridization (smFISH), we investigated the eRNA-mediated regulation of transcription during estrogen induction in MCF-7 cells. We demonstrate that eRNAs are localized exclusively in the nucleus and are induced with similar kinetics as target mRNAs...
December 8, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27932399/novel-hybrid-phenotype-revealed-in-small-cell-lung-cancer-by-a-transcription-factor-network-model-that-can-explain-tumor-heterogeneity
#10
Akshata R Udyavar, David J Wooten, Megan D Hoeksema, Mukesh Bansal, Andrea Califano, Lourdes Estrada, Santiago Schnell, Jonathan M Irish, Pierre P Massion, Vito Quaranta
Small cell lung cancer (SCLC) is a devastating disease due to its propensity for early invasion and refractory relapse after initial treatment response. Although these aggressive traits have been associated with phenotypic heterogeneity, our understanding of this association remains incomplete. To fill this knowledge gap, we inferred a set of 33 transcription factors (TF) associated with gene signatures of the known neuroendocrine/epithelial (NE) and non-neuroendocrine/mesenchymal-like (ML) SCLC phenotypes...
December 8, 2016: Cancer Research
https://www.readbyqxmd.com/read/27932387/the-long-non-coding-rna-transcriptome-of-dictyostelium-discoideum-development
#11
Rafael D Rosengarten, Balaji Santhanam, Janez Kokosar, Gad Shaulsky
Dictyostelium discoideum live in the soil as single cells, engulfing bacteria and growing vegetatively. Upon starvation, tens of thousands of amoebae enter a developmental program that includes aggregation, multicellular differentiation, and sporulation. Major shifts across the protein-coding transcriptome accompany these developmental changes. However, no study has presented a global survey of long non-coding RNAs in D. discoideum To characterize the antisense and long intergenic non-coding RNA transcriptome, we analyzed previously published developmental time course samples using an RNA-sequencing library preparation method that selectively depletes ribosomal RNAs...
December 7, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/27932033/cellular-analysis-of-trophoblast-and-placenta
#12
Frances Wong, Brian J Cox
The placenta is composed of two lineages: the trophoblast and mesoderm. While morphological assessment of the placenta has highlighted major cell types and developmental structures, the human placenta is relatively unexplained on a molecular level. Current molecular analysis of the placenta has largely been confined to assessing whole organs that include both cell lineages and their differentiated progeny. This has confounded our understanding of the processes of placental development and function for two reasons...
November 30, 2016: Placenta
https://www.readbyqxmd.com/read/27931516/expansion-of-hair-follicle-stem-cells-sticking-to-isolated-sebaceous-glands-to-generate-in-vivo-epidermal-structures
#13
Huishan Zhang, Huashan Zhao, Jingqiao Qiao, Shoubing Zhang, Shuang Liu, Na Li, Xiaohua Lei, Lina Ning, Yujing Cao, Enkui Duan
Hair follicle stem cells (HFSCs) are considered one of the useful donor cell types for skin regenerative medicine owing to their robust proliferative capacity and multipotency. However, methods for easily and effectively obtaining HFSCs from a limited skin biopsy are still lacking. Here we report a novel approach for obtaining a subpopulation of HFSCs from a small skin sample from the rat tail, which uses the sebaceous glands (SGs) to capture the adjacent HFSCs. By means of organ culture, keratinocytes were expanded from the detached SGs, which also included adherent HFSCs from the hair follicle that could be passaged at the single-cell level...
November 2016: Cell Transplantation
https://www.readbyqxmd.com/read/27931250/tracing-the-origin-of-disseminated-tumor-cells-in-breast-cancer-using-single-cell-sequencing
#14
Jonas Demeulemeester, Parveen Kumar, Elen K Møller, Silje Nord, David C Wedge, April Peterson, Randi R Mathiesen, Renathe Fjelldal, Masoud Zamani Esteki, Koen Theunis, Elia Fernandez Gallardo, A Jason Grundstad, Elin Borgen, Lars O Baumbusch, Anne-Lise Børresen-Dale, Kevin P White, Vessela N Kristensen, Peter Van Loo, Thierry Voet, Bjørn Naume
BACKGROUND: Single-cell micro-metastases of solid tumors often occur in the bone marrow. These disseminated tumor cells (DTCs) may resist therapy and lay dormant or progress to cause overt bone and visceral metastases. The molecular nature of DTCs remains elusive, as well as when and from where in the tumor they originate. Here, we apply single-cell sequencing to identify and trace the origin of DTCs in breast cancer. RESULTS: We sequence the genomes of 63 single cells isolated from six non-metastatic breast cancer patients...
December 9, 2016: Genome Biology
https://www.readbyqxmd.com/read/27930750/spatial-chemical-stimulation-control-in-microenvironment-by-microfluidic-probe-integrated-device-for-cell-based-assay
#15
Masayuki Horayama, Kenta Shinha, Kazuya Kabayama, Teruo Fujii, Hiroshi Kimura
Cell-cell interactions play an important role in the development and function of multicellular organisms. To investigate these interactions in detail, it is necessary to evaluate the behavior of a cell population when the minimum number of cells in the population is stimulated by some chemical factors. We propose a microfluidic device integrated with microfluidic probe (MFP) functionality; this device is capable of imparting a chemical stimulus to cells within a microenvironment, for cell-based assays. The device contains MFP channels at the walls of the cell culture microchannels, and it can control a localized chemical stimulation area at the scale of a single cell to a few cells using MFP fluid control in a microspace...
2016: PloS One
https://www.readbyqxmd.com/read/27930326/cell-size-and-growth-regulation-in-the-arabidopsis-thaliana-apical-stem-cell-niche
#16
Lisa Willis, Yassin Refahi, Raymond Wightman, Benoit Landrein, José Teles, Kerwyn Casey Huang, Elliot M Meyerowitz, Henrik Jönsson
Cell size and growth kinetics are fundamental cellular properties with important physiological implications. Classical studies on yeast, and recently on bacteria, have identified rules for cell size regulation in single cells, but in the more complex environment of multicellular tissues, data have been lacking. In this study, to characterize cell size and growth regulation in a multicellular context, we developed a 4D imaging pipeline and applied it to track and quantify epidermal cells over 3-4 d in Arabidopsis thaliana shoot apical meristems...
December 5, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27930305/artemisia-annua-mutant-impaired-in-artemisinin-synthesis-demonstrates-importance-of-nonenzymatic-conversion-in-terpenoid-metabolism
#17
Tomasz Czechowski, Tony R Larson, Theresa M Catania, David Harvey, Geoffrey D Brown, Ian A Graham
Artemisinin, a sesquiterpene lactone produced by Artemisia annua glandular secretory trichomes, is the active ingredient in the most effective treatment for malaria currently available. We identified a mutation that disrupts the amorpha-4,11-diene C-12 oxidase (CYP71AV1) enzyme, responsible for a series of oxidation reactions in the artemisinin biosynthetic pathway. Detailed metabolic studies of cyp71av1-1 revealed that the consequence of blocking the artemisinin biosynthetic pathway is the redirection of sesquiterpene metabolism to a sesquiterpene epoxide, which we designate arteannuin X...
December 7, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27929752/efficient-production-of-bispecific-igg-of-different-isotypes-and-species-of-origin-in-single-mammalian-cells
#18
Michael Dillon, Yiyuan Yin, Jianhui Zhou, Luke McCarty, Diego Ellerman, Dionysos Slaga, Teemu T Junttila, Guanghui Han, Wendy Sandoval, Meric A Ovacik, Kedan Lin, Zhilan Hu, Amy Shen, Jacob E Corn, Christoph Spiess, Paul J Carter
Bispecific IgG production in single host cells has been a much sought-after goal to support the clinical development of these complex molecules. Current routes to single cell production of bispecific IgG include engineering heavy chains for heterodimerization and redesign of Fab arms for selective pairing of cognate heavy and light chains. Here, we describe novel designs to facilitate selective Fab arm assembly in conjunction with previously described knobs-into-holes mutations for preferential heavy chain heterodimerization...
December 8, 2016: MAbs
https://www.readbyqxmd.com/read/27929523/single-cell-barcoding-and-sequencing-using-droplet-microfluidics
#19
Rapolas Zilionis, Juozas Nainys, Adrian Veres, Virginia Savova, David Zemmour, Allon M Klein, Linas Mazutis
Single-cell RNA sequencing has recently emerged as a powerful tool for mapping cellular heterogeneity in diseased and healthy tissues, yet high-throughput methods are needed for capturing the unbiased diversity of cells. Droplet microfluidics is among the most promising candidates for capturing and processing thousands of individual cells for whole-transcriptome or genomic analysis in a massively parallel manner with minimal reagent use. We recently established a method called inDrops, which has the capability to index >15,000 cells in an hour...
January 2017: Nature Protocols
https://www.readbyqxmd.com/read/27928143/degradation-of-distillery-lees-shochu-kasu-by-cellulase-producing-thraustochytrids
#20
Yousuke Taoka, Naoki Nagano, Hiroyuki Kai, Masahiro Hayashi
Single cell oils produced by oleaginous microorganisms have attracted increasing interests as a petroleum alternative energy. Marine eukaryotes, thraustochytrids were heterotrophic, and can grow rapidly and accumulate large amount of lipids containing functional fatty acids, such as docosahexaenoic acid (DHA) in their cells body. In this investigation, thraustochytrids isolated from marine environment were cultured in the medium containing an industrial waste and an unused resource, distillery lees (Shochu kasu) to produce biofuel or functional fatty acids by microorganisms...
December 8, 2016: Journal of Oleo Science
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