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https://www.readbyqxmd.com/read/28428068/comparative-analysis-of-gene-expression-profiles-for-several-migrating-cell-types-identifies-cell-migration-regulators
#1
Young-Kyung Bae, Frank Macabenta, Heather Leigh Curtis, Angelike Stathopoulos
Cell migration is an instrumental process that ensures cells are properly positioned to support the specification of distinct tissue types during development. To provide insight, we used fluorescence activated cell sorting (FACS) to isolate two migrating cell types from the Drosophila embryo: caudal visceral mesoderm (CVM) cells, precursors of longitudinal muscles of the gut, and hemocytes (HCs), the Drosophila equivalent of blood cells. ~350 genes were identified from each of the sorted samples using RNA-seq, and in situ hybridization was used to confirm expression within each cell type or, alternatively, within other interacting, co-sorted cell types...
April 17, 2017: Mechanisms of Development
https://www.readbyqxmd.com/read/28400496/pea-border-cell-maturation-and-release-involve-complex-cell-wall-structural-dynamics
#2
Jozef Mravec, Xiaoyuan Guo, Aleksander R Hansen, Julia Schückel, Stjepan Kresimir Kracun, Maria Dalgaard Mikkelsen, Grégory Mouille, Ida Elisabeth Johansen, Peter Ulvskov, David Domozych, William George Tycho Willats
The adhesion of plant cells is vital for support and protection of the plant body and is maintained by a variety of molecular associations between cell wall components. In some specialized cases though, plant cells are programmed to detach and root cap-derived border cells are examples of this. Border cells (in some species known as border-like cells) provide an expendable barrier between roots and the environment. Their maturation and release is an important but poorly characterized cell separation event. To gain a deeper insight into the complex cellular dynamics underlying this process, we undertook a systematic, detailed analysis of pea (Pisum sativum) root tip cell walls...
April 11, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28374738/quantitative-3d-analysis-of-complex-single-border-cell-behaviors-in-coordinated-collective-cell-migration
#3
Adam Cliffe, David P Doupé, HsinHo Sung, Isaac Kok Hwee Lim, Kok Haur Ong, Li Cheng, Weimiao Yu
Understanding the mechanisms of collective cell migration is crucial for cancer metastasis, wound healing and many developmental processes. Imaging a migrating cluster in vivo is feasible, but the quantification of individual cell behaviours remains challenging. We have developed an image analysis toolkit, CCMToolKit, to quantify the Drosophila border cell system. In addition to chaotic motion, previous studies reported that the migrating cells are able to migrate in a highly coordinated pattern. We quantify the rotating and running migration modes in 3D while also observing a range of intermediate behaviours...
April 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28357164/subdural-thoracolumbar-spine-hematoma-after-spinal-anesthesia-a-rare-occurrence-and-literature-review-of-spinal-hematomas-after-spinal-anesthesia
#4
REVIEW
Prasanthi Maddali, Blake Walker, Christian Fisahn, Jeni Page, Vicki Diaz, Michael E Zwillman, Rod J Oskouian, R Shane Tubbs, Marc Moisi
Spinal hematomas are a rare but serious complication of spinal epidural anesthesia and are typically seen in the epidural space; however, they have been documented in the subdural space. Spinal subdural hematomas likely exist within a traumatically induced space within the dural border cell layer, rather than an anatomical subdural space. Spinal subdural hematomas present a dangerous clinical situation as they have the potential to cause significant compression of neural elements and can be easily mistaken for spinal epidural hematomas...
February 16, 2017: Curēus
https://www.readbyqxmd.com/read/28355135/dynamic-transcriptional-signature-and-cell-fate-analysis-reveals-plasticity-of-individual-neural-plate-border-cells
#5
Daniela Roellig, Johanna Tan-Cabugao, Sevan Esaian, Marianne E Bronner
The 'neural plate border' of vertebrate embryos contains precursors of neural crest and placode cells, both defining vertebrate characteristics. How these lineages segregate from neural and epidermal fates has been a matter of debate. We address this by performing a fine-scale quantitative temporal analysis of transcription factor expression in the neural plate border of chick embryos. The results reveal significant overlap of transcription factors characteristic of multiple lineages in individual border cells from gastrula through neurula stages...
March 29, 2017: ELife
https://www.readbyqxmd.com/read/28270783/semi-supervised-learning-of-cartesian-factors-a-top-down-model-of-the-entorhinal-hippocampal-complex
#6
András Lőrincz, András Sárkány
The existence of place cells (PCs), grid cells (GCs), border cells (BCs), and head direction cells (HCs) as well as the dependencies between them have been enigmatic. We make an effort to explain their nature by introducing the concept of Cartesian Factors. These factors have specific properties: (i) they assume and complement each other, like direction and position and (ii) they have localized discrete representations with predictive attractors enabling implicit metric-like computations. In our model, HCs make the distributed and local representation of direction...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28161726/medial-entorhinal-cortex-and-medial-septum-contribute-to-self-motion-based-linear-distance-estimation
#7
Pierre-Yves Jacob, Marta Gordillo-Salas, Justine Facchini, Bruno Poucet, Etienne Save, Francesca Sargolini
Path integration is a navigation strategy that requires animals to integrate self-movements during exploration to determine their position in space. The medial entorhinal cortex (MEC) has been suggested to play a pivotal role in this process. Grid cells, head-direction cells, border cells as well as speed cells within the MEC collectively provide a dynamic representation of the animal position in space based on the integration of self-movements. All these cells are strongly modulated by theta oscillations, thus suggesting that theta rhythmicity in the MEC may be essential for integrating and coordinating self-movement information during navigation...
February 4, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28161642/drosophila-tensin-plays-an-essential-role-in-cell-migration-and-planar-polarity-formation-during-oogenesis-by-mediating-integrin-dependent-extracellular-signals-to-actin-organization
#8
In Jun Cha, Jang Ho Lee, Kyoung Sang Cho, Sung Bae Lee
Oogenesis in Drosophila involves very dynamic cellular changes such as cell migration and polarity formation inside an ovary during short period. Previous studies identified a number of membrane-bound receptors directly receiving certain types of extracellular inputs as well as intracellular signalings to be involved in the regulation of these dynamic cellular changes. However, yet our understanding on exactly how these receptor-mediated extracellular inputs lead to dynamic cellular changes remains largely unclear...
March 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28143705/non-autonomous-role-of-cdc42-in-cell-cell-communication-during-collective-migration
#9
Nathalie Colombié, Valérie Choesmel-Cadamuro, Jennifer Series, Gregory Emery, Xiaobo Wang, Damien Ramel
Collective cell migration is involved in numerous processes both physiological, such as embryonic development, and pathological such as metastasis. Compared to single cell migration, collective motion requires cell behaviour coordination through an as-yet poorly understood but critical cell-cell communication mechanism. Using Drosophila border cell migration, we show here that the small Rho GTPase Cdc42 regulates cell-cell communication. Indeed, we demonstrate that Cdc42 controls protrusion formation in a cell non-autonomous manner...
March 1, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28114410/a-gap-junction-protein-inx2-modulates-calcium-flux-to-specify-border-cell-fate-during-drosophila-oogenesis
#10
Aresh Sahu, Ritabrata Ghosh, Girish Deshpande, Mohit Prasad
Intercellular communication mediated by gap junction (GJ) proteins is indispensable during embryogenesis, tissue regeneration and wound healing. Here we report functional analysis of a gap junction protein, Innexin 2 (Inx2), in cell type specification during Drosophila oogenesis. Our data reveal a novel involvement of Inx2 in the specification of Border Cells (BCs), a migratory cell type, whose identity is determined by the cell autonomous STAT activity. We show that Inx2 influences BC fate specification by modulating STAT activity via Domeless receptor endocytosis...
January 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28109283/ethanol-extracted-cameroonian-propolis-exerts-estrogenic-effects-and-alleviates-hot-flushes-in-ovariectomized-wistar-rats
#11
Stéphane Zingue, Chantal Beatrice Magne Nde, Thomas Michel, Derek Tantoh Ndinteh, Jules Tchatchou, Moïse Adamou, Xavier Fernandez, Fernand-Nestor Tchuenguem Fohouo, Colin Clyne, Dieudonné Njamen
BACKGROUND: Since the biological properties of propolis depend to the plants that can be found in a specific region, propolis from unexplored regions attracts the attention of scientists. Ethanolic extract of Cameroonian propolis (EEP) is used to treat various ailments including gynecological problems and amenorrhea. Since there were no scientific data to support the above claims, the present study was therefore undertaken to assess estrogenic properties of Cameroonian propolis. METHODS: To achieve our goal, the ability of EEP to induce MCF-7 cells proliferation in E-screen assay as well as to activate estrogen receptors α (ERα) and β (ERβ) in cell-based reporter gene assays using human embryonic kidney cells (HEK293T) transfected with ERs was tested...
January 21, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27873085/quantitative-analysis-of-supporting-cell-subtype-labeling-among-creer-lines-in-the-neonatal-mouse-cochlea
#12
Melissa M McGovern, Joseph Brancheck, Auston C Grant, Kaley A Graves, Brandon C Cox
Four CreER lines that are commonly used in the auditory field to label cochlear supporting cells (SCs) are expressed in multiple SC subtypes, with some lines also showing reporter expression in hair cells (HCs). We hypothesized that altering the tamoxifen dose would modify CreER expression and target subsets of SCs. We also used two different reporter lines, ROSA26 (tdTomato) and CAG-eGFP, to achieve the same goal. Our results confirm previous reports that Sox2 (CreERT2) and Fgfr3-iCreER (T2) are not only expressed in neonatal SCs but also in HCs...
April 2017: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/27679639/alkali-soluble-pectin-is-the-primary-target-of-aluminum-immobilization-in-root-border-cells-of-pea-pisum-sativum
#13
Jin Yang, Mei Qu, Jing Fang, Ren Fang Shen, Ying Ming Feng, Jia You Liu, Jian Feng Bian, Li Shu Wu, Yong Ming He, Min Yu
We investigated the hypothesis that a discrepancy of Al binding in cell wall constituents determines Al mobility in root border cells (RBCs) of pea (Pisum sativum), which provides protection for RBCs and root apices under Al toxicity. Plants of pea (P. sativum L. 'Zhongwan no. 6') were subjected to Al treatments under mist culture. The concentration of Al in RBCs was much higher than that in the root apex. The Al content in RBCs surrounding one root apex (10(4) RBCs) was approximately 24.5% of the total Al in the root apex (0-2...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27600524/circuitous-genetic-regulation-governs-a-straightforward-cell-migration
#14
REVIEW
Afsoon Saadin, Michelle Starz-Gaiano
Drosophila border cells undergo a straightforward and stereotypical collective migration during egg development. However, a complex genetic program underlies this process. A variety of approaches, including biochemical, genetic, and imaging strategies have identified many regulatory components, revealing layers of control. This complexity suggests that the active processes of evaluating the environment, remodeling the cytoskeleton, and coordinating movements among cells, demand rapid systems for modulating cell behaviors...
October 2016: Trends in Genetics: TIG
https://www.readbyqxmd.com/read/27481828/the-brassicaceae-species-heliophila-coronopifolia-produces-root-border-like-cells-that-protect-the-root-tip-and-secrete-defensin-peptides
#15
Florent Weiller, John P Moore, Philip Young, Azeddine Driouich, Melané A Vivier
Background and Aims: Root border cells and border-like cells (BLCs), the latter originally described in Arabidopsis thaliana , have been described as cells released at the root tips of the species in which they occur. BLCs are thought to provide protection to root meristems similar to classical root border cells. In addition, four defensin peptides (Hc-AFP1-4) have previously been characterized from Heliophila coronopifolia , a South African semi-desert flower, and found to be strongly antifungal...
March 1, 2017: Annals of Botany
https://www.readbyqxmd.com/read/27449281/visual-landmarks-sharpen-grid-cell-metric-and-confer-context-specificity-to-neurons-of-the-medial-entorhinal-cortex
#16
José Antonio Pérez-Escobar, Olga Kornienko, Patrick Latuske, Laura Kohler, Kevin Allen
Neurons of the medial entorhinal cortex (MEC) provide spatial representations critical for navigation. In this network, the periodic firing fields of grid cells act as a metric element for position. The location of the grid firing fields depends on interactions between self-motion information, geometrical properties of the environment and nonmetric contextual cues. Here, we test whether visual information, including nonmetric contextual cues, also regulates the firing rate of MEC neurons. Removal of visual landmarks caused a profound impairment in grid cell periodicity...
2016: ELife
https://www.readbyqxmd.com/read/27425616/cell-type-specific-differences-in-spike-timing-and-spike-shape-in-the-rat-parasubiculum-and-superficial-medial-entorhinal-cortex
#17
Christian Laut Ebbesen, Eric Torsten Reifenstein, Qiusong Tang, Andrea Burgalossi, Saikat Ray, Susanne Schreiber, Richard Kempter, Michael Brecht
The medial entorhinal cortex (MEC) and the adjacent parasubiculum are known for their elaborate spatial discharges (grid cells, border cells, etc.) and the precessing of spikes relative to the local field potential. We know little, however, about how spatio-temporal firing patterns map onto cell types. We find that cell type is a major determinant of spatio-temporal discharge properties. Parasubicular neurons and MEC layer 2 (L2) pyramids have shorter spikes, discharge spikes in bursts, and are theta-modulated (rhythmic, locking, skipping), but spikes phase-precess only weakly...
July 26, 2016: Cell Reports
https://www.readbyqxmd.com/read/27412523/relating-proton-pumps-with-gap-junctions-colocalization-of-ductin-the-channel-forming-subunit-c-of-v-atpase-with-subunit-a-and-with-innexins-2-and-3-during-drosophila-oogenesis
#18
Julia Lautemann, Johannes Bohrmann
BACKGROUND: Ion-transport mechanisms and gap junctions are known to cooperate in creating bioelectric phenomena, like pH gradients, voltage gradients and ion fluxes within single cells, tissues, organs, and whole organisms. Such phenomena have been shown to play regulatory roles in a variety of developmental and regenerative processes. Using Drosophila oogenesis as a model system, we aim at characterizing in detail the mechanisms underlying bioelectric phenomena in order to reveal their regulatory functions...
July 13, 2016: BMC Developmental Biology
https://www.readbyqxmd.com/read/27396338/an-atypical-tropomyosin-in-drosophila-with-intermediate-filament-like-properties
#19
Aeri Cho, Masato Kato, Tess Whitwam, Ji Hoon Kim, Denise J Montell
A longstanding mystery has been the absence of cytoplasmic intermediate filaments (IFs) from Drosophila despite their importance in other organisms. In the course of characterizing the in vivo expression and functions of Drosophila Tropomyosin (Tm) isoforms, we discovered an essential but unusual product of the Tm1 locus, Tm1-I/C, which resembles an IF protein in some respects. Like IFs, Tm1-I/C spontaneously forms filaments in vitro that are intermediate in diameter between F-actin and microtubules. Like IFs but unlike canonical Tms, Tm1-I/C contains N- and C-terminal low-complexity domains flanking a central coiled coil...
July 26, 2016: Cell Reports
https://www.readbyqxmd.com/read/27390353/root-exudate-of-solanum-tuberosum-is-enriched-in-galactose-containing-molecules-and-impacts-the-growth-of-pectobacterium-atrosepticum
#20
Abdoul Salam Koroney, Carole Plasson, Barbara Pawlak, Ramatou Sidikou, Azeddine Driouich, Laurence Menu-Bouaouiche, Maïté Vicré-Gibouin
BACKGROUND AND AIMS: Potato (Solanum tuberosum) is an important food crop and is grown worldwide. It is, however, significantly sensitive to a number of soil-borne pathogens that affect roots and tubers, causing considerable economic losses. So far, most research on potato has been dedicated to tubers and hence little attention has been paid to root structure and function. METHODS: In the present study we characterized root border cells using histochemical staining, immunofluorescence labelling of cell wall polysaccharides epitopes and observation using laser confocal microscopy...
July 6, 2016: Annals of Botany
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