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https://www.readbyqxmd.com/read/28934593/big-lessons-from-little-yeast-budding-and-fission-yeast-centrosome-structure-duplication-and-function
#1
Ann M Cavanaugh, Sue L Jaspersen
Centrosomes are a functionally conserved feature of eukaryotic cells that play an important role in cell division. The conserved γ-tubulin complex organizes spindle and astral microtubules, which, in turn, separate replicated chromosomes accurately into daughter cells. Like DNA, centrosomes are duplicated once each cell cycle. Although in some cell types it is possible for cell division to occur in the absence of centrosomes, these divisions typically result in defects in chromosome number and stability. In singlecelled organisms such as fungi, centrosomes [known as spindle pole bodies (SPBs)] are essential for cell division...
September 15, 2017: Annual Review of Genetics
https://www.readbyqxmd.com/read/28934222/endogenous-rgs14-is-a-cytoplasmic-nuclear-shuttling-protein-that-localizes-to-juxtanuclear-membranes-and-chromatin-rich-regions-of-the-nucleus
#2
Mary Rose Branch, John R Hepler
Regulator of G protein signaling 14 (RGS14) is a multifunctional scaffolding protein that integrates G protein and H-Ras/MAPkinase signaling pathways to regulate synaptic plasticity important for hippocampal learning and memory. However, to date, little is known about the subcellular distribution and roles of endogenous RGS14 in a neuronal cell line. Most of what is known about RGS14 cellular behavior is based on studies of tagged, recombinant RGS14 ectopically overexpressed in unnatural host cells. Here, we report for the first time a comprehensive assessment of the subcellular distribution and dynamic localization of endogenous RGS14 in rat B35 neuroblastoma cells...
2017: PloS One
https://www.readbyqxmd.com/read/28932622/high-throughput-nuclear-delivery-and-rapid-expression-of-dna-via-mechanical-and-electrical-cell-membrane-disruption
#3
Xiaoyun Ding, Martin Stewart, Armon Sharei, James C Weaver, Robert S Langer, Klavs F Jensen
Nuclear transfection of DNA into mammalian cells is challenging yet critical for many biological and medical studies. Here, by combining cell squeezing and electric-field-driven transport in a device that integrates microfluidic channels with constrictions and microelectrodes, we demonstrate nuclear delivery of plasmid DNA within 1 hour after treatment, the most rapid DNA expression in a high-throughput setting (up to millions of cells per minute per device). Passing cells at high speed through microfluidic constrictions smaller than the cell diameter mechanically disrupts the cell membrane, allowing a subsequent electric field to further disrupt the nuclear envelope and drive DNA molecules into the cytoplasm and nucleus...
2017: Nature biomedical engineering
https://www.readbyqxmd.com/read/28931598/coordinated-increase-of-nuclear-tension-and-lamin-a-with-matrix-stiffness-out-competes-lamin-b-receptor-which-favors-soft-tissue-phenotypes
#4
Amnon Buxboim, Jerome Irianto, Joe Swift, Avathamsa Athirasala, Jae-Won Shin, Florian Rehfeldt, Dennis E Discher
Matrix stiffness that is sensed by a cell or measured by a purely physical probe reflects the intrinsic elasticity of the matrix and also how thick or thin the matrix is. Here, mesenchymal stem cells (MSCs) and their nuclei spread in response to thickness-corrected matrix micro-elasticity, with increases in nuclear tension and nuclear stiffness resulting from increases in myosin-II and lamin-A,C. Linearity between the widely varying projected area of a cell and its nucleus across many matrices, timescales, and myosin-II activity levels indicates a constant ratio of nucleus-to-cell volume, despite the differentiation potential of MSCs...
September 20, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28928806/alterations-in-iqgap1-expression-and-localization-in-colorectal-carcinoma-and-liver-metastases-following-oxaliplatin-based-chemotherapy
#5
Deborah Rotoli, Manuel Morales, María Del Carmen Maeso, María Del Pino García, Ricardo Gutierrez, Francisco Valladares, Julio Ávila, Lucio Díaz-Flores, Ali Mobasheri, Pablo Martín-Vasallo
IQGAP1 is a scaffolding protein that serves a key role in cell dynamics by integrating internal and external stimuli to distinct signal outputs. Previous studies have identified several genes that are significantly up- or downregulated in the peripheral white cells (PWCs) of patients with colorectal adenocarcinoma (CRC), who underwent oxaliplatin-based chemotherapy (CT). In addition, screening studies have reported that IQ-motif containing GTPase activating protein 1 (IQGAP1) transcriptional expression levels varied from 'off' to 'on' following oxaliplatin CT...
September 2017: Oncology Letters
https://www.readbyqxmd.com/read/28924627/structure-and-biogenesis-of-ribonucleoprotein-bodies-in-epidermal-cells-of-caragana-arborescens-l
#6
Elizabeth Kordyum, Ninel Bilyavska
Epidermal cells of leaf petioles, pedicles, and sepals in Caragana arborescens L. are characterized with a unique biogenesis of intracellular bodies, the presence of which continues during 10-12 days in spring, from budding till flowering and fruit inception. Initially, a nuclear body is formed as a derivative of the nucleolus at the beginning of elongation of the protodermal cells, whereas a cytoplasmic body is formed in the proximity of the nuclear envelope later. Nuclear bodies and cytoplasmic bodies do not contain DNA, lipids, and starch, and they consist of RNA tightly packaged with proteins mainly in the form of short thin fibrils with thickness of 6 nm...
September 19, 2017: Protoplasma
https://www.readbyqxmd.com/read/28921961/three-dimensional-reconstruction-of-nuclear-envelope-architecture-using-dual-color-metal-induced-energy-transfer-imaging
#7
Anna M Chizhik, Daja Ruhlandt, Janine Pfaff, Narain Karedla, Alexey I Chizhik, Ingo Gregor, Ralph H Kehlenbach, Jörg Enderlein
The nuclear envelope, comprising the inner and the outer nuclear membrane, separates the nucleus from the cytoplasm and plays a key role in cellular functions. Nuclear pore complexes (NPCs), which are embedded in the nuclear envelope, control transport of macromolecules between the two compartments. Here, using dual-color metal-induced energy transfer (MIET), we determine the axial distance between Lap2β and Nup358 as markers for the inner nuclear membrane and the cytoplasmic side of the NPC, respectively...
September 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28901826/nuclear-networking
#8
Wei Xie, Brian Burke
Nuclear lamins are intermediate filament proteins that represent important structural components of metazoan nuclear envelopes (NEs). By combining proteomics and superresolution microscopy, we recently reported that both A- and B-type nuclear lamins form spatially distinct filament networks at the nuclear periphery of mouse fibroblasts. In particular, A-type lamins exhibit differential association with nuclear pore complexes (NPCs). Our studies reveal that the nuclear lamina network in mammalian somatic cells is less ordered and more complex than that of amphibian oocytes, the only other system in which the lamina has been visualized at high resolution...
July 4, 2017: Nucleus
https://www.readbyqxmd.com/read/28901510/ferruginol-exhibits-anticancer-effects-in-ovcar%C3%A2-3-human-ovary-cancer-cells-by-inducing-apoptosis-inhibition-of-cancer-cell-migration-and-g2-m-phase-cell-cycle-arrest
#9
Wen-Dong Xiong, Jian Gong, Chao Xing
The primary aim of the current study was to investigate the antitumor effects of ferruginol in OVCAR‑3 human ovary cancer cells. The effects of ferruginol on cell apoptosis, cell migration and cell cycle phase distribution were also evaluated. Cell cytotoxicity induced by ferruginol was determined by an MTT assay, while fluorescence microscopy and transmission electron microscopy (TEM) were performed to investigate apoptotic effects. Flow cytometry was employed to determine the effects of ferruginol on the cell cycle and an in vitro wound healing assay was performed to investigate effects on cancer cell migration...
September 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28900229/a-class-ii-small-heat-shock-protein-oshsp18-0-plays-positive-roles-in-both-biotic-and-abiotic-defense-responses-in-rice
#10
Jie Kuang, Jianzhong Liu, Jun Mei, Changchun Wang, Haitao Hu, Yanjun Zhang, Meihao Sun, Xi Ning, Langtao Xiao, Ling Yang
Bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the most devastating diseases of rice. However, the molecular mechanism underpinning the Xoo resistance of rice is still not fully understood. Here, we report that a class II small heat shock protein gene, OsHsp18.0, whose expression was differentially induced between a resistant and a susceptible variety in response to Xoo infection, plays positive roles in both biotic and abiotic resistance. The molecular chaperone activity of OsHsp18...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28900009/on-the-origin-of-shape-fluctuations-of-the-cell-nucleus
#11
Fang-Yi Chu, Shannon C Haley, Alexandra Zidovska
The nuclear envelope (NE) presents a physical boundary between the cytoplasm and the nucleoplasm, sandwiched in between two highly active systems inside the cell: cytoskeleton and chromatin. NE defines the shape and size of the cell nucleus, which increases during the cell cycle, accommodating for chromosome decondensation followed by genome duplication. In this work, we study nuclear shape fluctuations at short time scales of seconds in human cells. Using spinning disk confocal microscopy, we observe fast fluctuations of the NE, visualized by fluorescently labeled lamin A, and of the chromatin globule surface (CGS) underneath the NE, visualized by fluorescently labeled histone H2B...
September 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28899926/peptides-mediating-dna-transport-on-microtubules-and-their-impact-on-non-viral-gene-transfer-efficiency
#12
Patrick Midoux, Lucie Pigeon, Cristine Gonçalves, Chantal Pichon
Synthetic vectors such as cationic polymers and cationic lipids remain attractive tools for non-viral gene transfer which is a complex process whose effectiveness relies on the ability to deliver a plasmid DNA (pDNA) into the nucleus of non-dividing cells. Once in the cytosol, the transport of pDNAs towards the nuclear envelop is strongly impaired by their very low cytosolic mobility due to their large size. To promote their movement towards the cell nucleus, few strategies have been implemented to exploit dynein, the microtubule's motor protein, for propagation of cytosolic pDNA along the microtubules (MTs) towards the cell nucleus...
September 12, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28887150/geography-and-past-climate-changes-have-shaped-the-evolution-of-a-widespread-lizard-from-the-chilean-hotspot
#13
Carla Muñoz-Mendoza, Guillermo D'Elía, Alejandra Panzera, Marco A Méndez T, Amado Villalobos-Leiva, Jack W Sites, Pedro F Victoriano
The complex orogenic history and structure of Southern South America, coupled with Pleistocene glacial cycles, have generated paleoclimatic and environmental changes that influenced the spatial distribution and genetic composition of natural populations. Despite the increased number of phylogeographic studies in this region and given the frequent idiosyncratic phylogeographic patterns, there is still the need to focus research especially on species that are currently distributed within a wide range of bioclimatic regimes, and that historically have been subject to contrasting scenarios...
September 5, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28883038/yeast-silencing-factor-sir4-and-a-subset-of-nucleoporins-form-a-complex-distinct-from-nuclear-pore-complexes
#14
Diego L Lapetina, Christopher Ptak, Ulyss K Roesner, Richard W Wozniak
Interactions occurring at the nuclear envelope (NE)-chromatin interface influence both NE structure and chromatin organization. Insights into the functions of NE-chromatin interactions have come from the study of yeast subtelomeric chromatin and its association with the NE, including the identification of various proteins necessary for tethering subtelomeric chromatin to the NE and the silencing of resident genes. Here we show that four of these proteins-the silencing factor Sir4, NE-associated Esc1, the SUMO E3 ligase Siz2, and the nuclear pore complex (NPC) protein Nup170-physically and functionally interact with one another and a subset of NPC components (nucleoporins or Nups)...
September 7, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28881650/apex2-enhanced-electron-microscopy-distinguishes-sigma-1-receptor-localization-in-the-nucleoplasmic-reticulum
#15
Timur A Mavlyutov, Huan Yang, Miles L Epstein, Arnold E Ruoho, Jay Yang, Lian-Wang Guo
The sigma-1 receptor (Sig1R) is an endoplasmic reticulum chaperonin that is attracting tremendous interest as a potential anti-neurodegenerative target. While this membrane protein is known to reside in the inner nuclear envelope (NE) and influences transcription, apparent Sig1R presence in the nucleoplasm is often observed, seemingly contradicting its NE localization. We addressed this confounding issue by applying an antibody-free approach of electron microscopy (EM) to define Sig1R nuclear localization. We expressed APEX2 peroxidase fused to Sig1R-GFP in a Sig1R-null NSC34 neuronal cell line generated with CRISPR-Cas9...
August 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28878355/comparative-study-on-cellular-entry-of-incinerated-ancient-gold-particles-swarna-bhasma-and-chemically-synthesized-gold-particles
#16
Daniel Beaudet, Simona Badilescu, Kiran Kuruvinashetti, Ahmad Sohrabi Kashani, Dilan Jaunky, Sylvie Ouellette, Alisa Piekny, Muthukumaran Packirisamy
Gold nanoparticles (AuNPs) are used for a number of imaging and therapeutic applications in east and western part of the world. For thousands of years, the traditional Indian Ayurvedic approach to healing involves the use of incinerated gold ash, prepared with a variety of plant extracts and minerals depending on the region. Here, we describe the characterization of incinerated gold particles (IAuPs) in HeLa (human cells derived from cervical cancer) and HFF-1 (human foreskin fibroblast cells) in comparison to synthesized citrate-capped gold nanoparticles (AuNPs)...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28878082/lysine-242-within-helix-10-of-the-pseudorabies-virus-nuclear-egress-complex-pul31-component-is-critical-for-primary-envelopment-of-nucleocapsids
#17
Sebastian Rönfeldt, Barbara G Klupp, Kati Franzke, Thomas C Mettenleiter
Newly assembled herpesvirus nucleocapsids are translocated from the nucleus to the cytosol by a vesicle-mediated process engaging the nuclear membranes. This transport is governed by the conserved nuclear egress complex (NEC), consisting of the alphaherpesviral pUL34 and pUL31 homologs. The NEC is not only required for efficient nuclear egress but also sufficient for vesicle formation from the inner nuclear membrane (INM) as well as from synthetic lipid bilayers. The recently solved crystal structures for the NECs from different herpesviruses revealed molecular details of this membrane deformation and scission machinery uncovering the interfaces involved in complex and coat formation...
September 6, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28877489/rupture-dynamics-and-chromatin-herniation-in%C3%A2-deformed-nuclei
#18
Dan Deviri, Dennis E Discher, Sam A Safran
During migration of cells in vivo, in both pathological processes such as cancer metastasis or physiological events such as immune cell migration through tissue, the cells must move through narrow interstitial spaces that can be smaller than the nucleus. This can induce deformation of the nucleus which, according to recent experiments, may result in rupture of the nuclear envelope that can lead to cell death, if not prevented or healed within an appropriate time. The nuclear envelope, which can be modeled as a double lipid bilayer attached to a viscoelastic gel (lamina) whose elasticity and viscosity primarily depend on the lamin composition, may utilize mechanically induced, self-healing mechanisms that allow the hole to be closed after the deformation-induced strains are reduced by leakage of the internal fluid...
September 5, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28875991/nuclear-envelope-chromosomes-one-baf-layer-to-bind-them-all
#19
Paulina Strzyz
No abstract text is available yet for this article.
October 2017: Nature Reviews. Molecular Cell Biology
https://www.readbyqxmd.com/read/28873410/n-terminally-truncated-pom121c-inhibits-hiv-1-replication
#20
Hideki Saito, Hiroaki Takeuchi, Takao Masuda, Takeshi Noda, Shoji Yamaoka
Recent studies have identified host cell factors that regulate early stages of HIV-1 infection including viral cDNA synthesis and orientation of the HIV-1 capsid (CA) core toward the nuclear envelope, but it remains unclear how viral DNA is imported through the nuclear pore and guided to the host chromosomal DNA. Here, we demonstrate that N-terminally truncated POM121C, a component of the nuclear pore complex, blocks HIV-1 infection. This truncated protein is predominantly localized in the cytoplasm, does not bind to CA, does not affect viral cDNA synthesis, reduces the formation of 2-LTR and diminished the amount of integrated proviral DNA...
2017: PloS One
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