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  • Regulated changes in material properties underlie centrosome disassembly during mitotic exit.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-04-06
    Matthäus Mittasch,Vanna M Tran,Manolo U Rios,Anatol W Fritsch,Stephen J Enos,Beatriz Ferreira Gomes,Alec Bond,Moritz Kreysing,Jeffrey B Woodruff

    Centrosomes must resist microtubule-mediated forces for mitotic chromosome segregation. During mitotic exit, however, centrosomes are deformed and fractured by those same forces, which is a key step in centrosome disassembly. How the functional material properties of centrosomes change throughout the cell cycle, and how they are molecularly tuned, remain unknown. Here, we used optically induced flow

    更新日期:2020-04-06
  • Syncrip/hnRNP Q is required for activity-induced Msp300/Nesprin-1 expression and new synapse formation.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Joshua Titlow,Francesca Robertson,Aino Järvelin,David Ish-Horowicz,Carlas Smith,Enrico Gratton,Ilan Davis

    Memory and learning involve activity-driven expression of proteins and cytoskeletal reorganization at new synapses, requiring posttranscriptional regulation of localized mRNA a long distance from corresponding nuclei. A key factor expressed early in synapse formation is Msp300/Nesprin-1, which organizes actin filaments around the new synapse. How Msp300 expression is regulated during synaptic plasticity

    更新日期:2020-03-02
  • ALIX- and ESCRT-III-dependent sorting of tetraspanins to exosomes.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Jorge Larios,Vincent Mercier,Aurélien Roux,Jean Gruenberg

    The intraluminal vesicles (ILVs) of endosomes mediate the delivery of activated signaling receptors and other proteins to lysosomes for degradation, but they also modulate intercellular communication when secreted as exosomes. The formation of ILVs requires four complexes, ESCRT-0, -I, -II, and -III, with ESCRT-0, -I, and -II presumably involved in cargo sorting and ESCRT-III in membrane deformation

    更新日期:2020-03-02
  • TORC1 regulates vacuole membrane composition through ubiquitin- and ESCRT-dependent microautophagy.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Xi Yang,Weichao Zhang,Xin Wen,Patrick J Bulinski,Dominic A Chomchai,Felichi Mae Arines,Yun-Yu Liu,Simon Sprenger,David Teis,Daniel J Klionsky,Ming Li

    Cellular adaptation in response to nutrient limitation requires the induction of autophagy and lysosome biogenesis for the efficient recycling of macromolecules. Here, we discovered that starvation and TORC1 inactivation not only lead to the up-regulation of autophagy and vacuole proteins involved in recycling but also result in the down-regulation of many vacuole membrane proteins to supply amino

    更新日期:2020-03-02
  • An early endosome-derived retrograde trafficking pathway promotes secretory granule maturation.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Cheng-I J Ma,Yitong Yang,Taeah Kim,Chang Hua Chen,Gordon Polevoy,Miluska Vissa,Jason Burgess,Julie A Brill

    Regulated secretion is a fundamental cellular process in which biologically active molecules stored in long-lasting secretory granules (SGs) are secreted in response to external stimuli. Many studies have described mechanisms responsible for biogenesis and secretion of SGs, but how SGs mature remains poorly understood. In a genetic screen, we discovered a large number of endolysosomal trafficking genes

    更新日期:2020-03-02
  • CDK1 couples proliferation with protein synthesis.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Katharina Haneke,Johanna Schott,Doris Lindner,Anne Kruse Hollensen,Christian Kroun Damgaard,Cyril Mongis,Michael Knop,Wilhelm Palm,Alessia Ruggieri,Georg Stoecklin

    Cell proliferation exerts a high demand on protein synthesis, yet the mechanisms coupling the two processes are not fully understood. A kinase and phosphatase screen for activators of translation, based on the formation of stress granules in human cells, revealed cell cycle-associated kinases as major candidates. CDK1 was identified as a positive regulator of global translation, and cell synchronization

    更新日期:2020-03-02
  • ESCRT-III-mediated membrane fusion drives chromosome fragments through nuclear envelope channels.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Brandt Warecki,Xi Ling,Ian Bast,William Sullivan

    Mitotic cells must form a single nucleus during telophase or exclude part of their genome as damage-prone micronuclei. While research has detailed how micronuclei arise from cells entering anaphase with lagging chromosomes, cellular mechanisms allowing late-segregating chromosomes to rejoin daughter nuclei remain underexplored. Here, we find that late-segregating acentric chromosome fragments that

    更新日期:2020-03-02
  • Aurora B kinase is recruited to multiple discrete kinetochore and centromere regions in human cells.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Amanda J Broad,Keith F DeLuca,Jennifer G DeLuca

    Aurora B kinase has a critical role in regulating attachments between kinetochores and spindle microtubules during mitosis. Early in mitosis, kinase activity at kinetochores is high to promote attachment turnover, and in later mitosis, activity decreases to ensure attachment stabilization. Aurora B localizes prominently to inner centromeres, and a population of the kinase is also detected at kinetochores

    更新日期:2020-03-02
  • Untangling the contribution of Haspin and Bub1 to Aurora B function during mitosis.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Michael A Hadders,Sanne Hindriksen,My Anh Truong,Aditya N Mhaskar,J Pepijn Wopken,Martijn J M Vromans,Susanne M A Lens

    Aurora B kinase is essential for faithful chromosome segregation during mitosis. During (pro)metaphase, Aurora B is concentrated at the inner centromere by the kinases Haspin and Bub1. However, how Haspin and Bub1 collaborate to control Aurora B activity at centromeres remains unclear. Here, we show that either Haspin or Bub1 activity is sufficient to recruit Aurora B to a distinct chromosomal locus

    更新日期:2020-03-02
  • Dynamics of Auxilin 1 and GAK in clathrin-mediated traffic.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Kangmin He,Eli Song,Srigokul Upadhyayula,Song Dang,Raphael Gaudin,Wesley Skillern,Kevin Bu,Benjamin R Capraro,Iris Rapoport,Ilja Kusters,Minghe Ma,Tom Kirchhausen

    Clathrin-coated vesicles lose their clathrin lattice within seconds of pinching off, through the action of the Hsc70 "uncoating ATPase." The J- and PTEN-like domain-containing proteins, auxilin 1 (Aux1) and auxilin 2 (GAK), recruit Hsc70. The PTEN-like domain has no phosphatase activity, but it can recognize phosphatidylinositol phosphate head groups. Aux1 and GAK appear on coated vesicles in successive

    更新日期:2020-03-02
  • Cortical contraction drives the 3D patterning of epithelial cell surfaces.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Aaron P van Loon,Ivan S Erofeev,Ivan V Maryshev,Andrew B Goryachev,Alvaro Sagasti

    Cellular protrusions create complex cell surface topographies, but biomechanical mechanisms regulating their formation and arrangement are largely unknown. To study how protrusions form, we focused on the morphogenesis of microridges, elongated actin-based structures that are arranged in maze-like patterns on the apical surfaces of zebrafish skin cells. Microridges form by accreting simple finger-like

    更新日期:2020-03-02
  • Spatiotemporal control of phosphatidic acid signaling with optogenetic, engineered phospholipase Ds.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Reika Tei,Jeremy M Baskin

    Phosphatidic acid (PA) is both a central phospholipid biosynthetic intermediate and a multifunctional lipid second messenger produced at several discrete subcellular locations. Organelle-specific PA pools are believed to play distinct physiological roles, but tools with high spatiotemporal control are lacking for unraveling these pleiotropic functions. Here, we present an approach to precisely generate

    更新日期:2020-03-02
  • A reference library for assigning protein subcellular localizations by image-based machine learning.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Wiebke Schormann,Santosh Hariharan,David W Andrews

    Confocal micrographs of EGFP fusion proteins localized at key cell organelles in murine and human cells were acquired for use as subcellular localization landmarks. For each of the respective 789,011 and 523,319 optically validated cell images, morphology and statistical features were measured. Machine learning algorithms using these features permit automated assignment of the localization of other

    更新日期:2020-03-02
  • Active diffusion in oocytes nonspecifically centers large objects during prophase I and meiosis I.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Alexandra Colin,Gaëlle Letort,Nitzan Razin,Maria Almonacid,Wylie Ahmed,Timo Betz,Marie-Emilie Terret,Nir S Gov,Raphaël Voituriez,Zoher Gueroui,Marie-Hélène Verlhac

    Nucleus centering in mouse oocytes results from a gradient of actin-positive vesicle activity and is essential for developmental success. Here, we analyze 3D model simulations to demonstrate how a gradient in the persistence of actin-positive vesicles can center objects of different sizes. We test model predictions by tracking the transport of exogenous passive tracers. The gradient of activity induces

    更新日期:2020-03-02
  • Trpml controls actomyosin contractility and couples migration to phagocytosis in fly macrophages.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-03-02
    Sandra Sofía Edwards-Jorquera,Floris Bosveld,Yohanns A Bellaïche,Ana-María Lennon-Duménil,Álvaro Glavic

    Phagocytes use their actomyosin cytoskeleton to migrate as well as to probe their environment by phagocytosis or macropinocytosis. Although migration and extracellular material uptake have been shown to be coupled in some immune cells, the mechanisms involved in such coupling are largely unknown. By combining time-lapse imaging with genetics, we here identify the lysosomal Ca2+ channel Trpml as an

    更新日期:2020-03-02
  • IRE1β negatively regulates IRE1α signaling in response to endoplasmic reticulum stress.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Michael J Grey,Eva Cloots,Mariska S Simpson,Nicole LeDuc,Yevgeniy V Serebrenik,Heidi De Luca,Delphine De Sutter,Phi Luong,Jay R Thiagarajah,Adrienne W Paton,James C Paton,Markus A Seeliger,Sven Eyckerman,Sophie Janssens,Wayne I Lencer

    IRE1β is an ER stress sensor uniquely expressed in epithelial cells lining mucosal surfaces. Here, we show that intestinal epithelial cells expressing IRE1β have an attenuated unfolded protein response to ER stress. When modeled in HEK293 cells and with purified protein, IRE1β diminishes expression and inhibits signaling by the closely related stress sensor IRE1α. IRE1β can assemble with and inhibit

    更新日期:2020-02-03
  • Multiple actin networks coordinate mechanotransduction at the immunological synapse.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Daniel Blumenthal,Janis K Burkhardt

    Activation of naive T cells by antigen-presenting cells (APCs) is an essential step in mounting an adaptive immune response. It is known that antigen recognition and T cell receptor (TCR) signaling depend on forces applied by the T cell actin cytoskeleton, but until recently, the underlying mechanisms have been poorly defined. Here, we review recent advances in the field, which show that specific actin-dependent

    更新日期:2020-02-03
  • Susana Godinho: Placing cell biology at the center of cancer research.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Marie Anne O'Donnell

    Godinho investigates the role centrosomes play in cancer cell biology.

    更新日期:2020-02-03
  • Membrane fusion drives pronuclear meeting in the one-cell embryo.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Linda Ma,Daniel A Starr

    The mechanisms that control how the two parental pronuclei fuse in the first mitosis of the embryo are poorly understood. In this issue, Rahman et al. (2020. J. Cell Biol.https://doi.org/10.1083/jcb.201909137) found that membrane fusion between pronuclear envelopes, followed by fenestration, promotes pronuclear fusion.

    更新日期:2020-02-03
  • Neuronal GDPGP1 and glycogen metabolism: friend or foe?
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Neel S Singhal,Evan M Lee,Dengke K Ma

    The adult brain consumes glucose for energy needs and stores glucose as glycogen mainly in astrocytes. Schulz et al. (2020. J. Cell Biol.https://doi.org/10.1083/jcb.201807127) identify the stress-regulated metabolic enzyme GDPGP1 that promotes neuronal survival likely through glycogen reserves in mouse and C. elegans neurons.

    更新日期:2020-02-03
  • A life in pictures-Marilyn Gist Farquhar.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Jennifer L Stow,Jaakko Saraste,William J Brown

    更新日期:2020-02-03
  • The stress-responsive gene GDPGP1/mcp-1 regulates neuronal glycogen metabolism and survival.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Alexander Schulz,Yuichi Sekine,Motunrayo J Oyeyemi,Alexander J Abrams,Manasa Basavaraju,Sung Min Han,Marco Groth,Helen Morrison,Stephen M Strittmatter,Marc Hammarlund

    Maladaptive responses to stress might play a role in the sensitivity of neurons to stress. To identify novel cellular responses to stress, we performed transcriptional analysis in acutely stressed mouse neurons, followed by functional characterization in Caenorhabditis elegans. In both contexts, we found that the gene GDPGP1/mcp-1 is down-regulated by a variety of stresses. Functionally, the enzyme

    更新日期:2020-02-03
  • NuMA1 facilitates the assembly of the axon initial segment by promoting the retention of neurofascin-186.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Amr Abouelezz,Pirta Hotulainen

    Axon initial segment (AIS) functionality relies on a specific organization of the AIS with high enrichment of structural and functional proteins. In this issue, Torii et al. (2019. J. Cell. Biol.https://doi.org/10.1083/jcb.201907048) describe a mechanism for achieving a high density of proteins in the nascent AIS.

    更新日期:2020-02-03
  • Clathrin's adaptor interaction sites are repurposed to stabilize microtubules during mitosis.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Arnaud Rondelet,Yu-Chih Lin,Divya Singh,Arthur T Porfetye,Harish C Thakur,Andreas Hecker,Pia Brinkert,Nadine Schmidt,Shweta Bendre,Franziska Müller,Lisa Mazul,Per O Widlund,Tanja Bange,Michael Hiller,Ingrid R Vetter,Alexander W Bird

    Clathrin ensures mitotic spindle stability and efficient chromosome alignment, independently of its vesicle trafficking function. Although clathrin localizes to the mitotic spindle and kinetochore fiber microtubule bundles, the mechanisms by which clathrin stabilizes microtubules are unclear. We show that clathrin adaptor interaction sites on clathrin heavy chain (CHC) are repurposed during mitosis

    更新日期:2020-02-03
  • GABA in, garbage out: AIS-located proteasomes regulate the developmental GABA switch.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Christophe Leterrier

    The GABA response switch from excitatory to inhibitory is a key event in neuronal maturation that depends on the regulated expression of chloride transporters NKCC1 and KCC2. In this issue, Lee et al. (2020. J. Cell. Biol.https://doi.org/10.1083/jcb.201903033) describe how degradation of NKCC1 by proteasomes immobilized at the axon initial segment (AIS) by the Ecm29 adaptor contributes to this regulation

    更新日期:2020-02-03
  • Hemidesmosomes modulate force generation via focal adhesions.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Wei Wang,Alba Zuidema,Lisa Te Molder,Leila Nahidiazar,Liesbeth Hoekman,Thomas Schmidt,Stefano Coppola,Arnoud Sonnenberg

    Hemidesmosomes are specialized cell-matrix adhesion structures that are associated with the keratin cytoskeleton. Although the adhesion function of hemidesmosomes has been extensively studied, their role in mechanosignaling and transduction remains largely unexplored. Here, we show that keratinocytes lacking hemidesmosomal integrin α6β4 exhibit increased focal adhesion formation, cell spreading, and

    更新日期:2020-02-03
  • CLASP2 binding to curved microtubule tips promotes flux and stabilizes kinetochore attachments.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Hugo Girão,Naoyuki Okada,Tony A Rodrigues,Alexandra O Silva,Ana C Figueiredo,Zaira Garcia,Tatiana Moutinho-Santos,Ikuko Hayashi,Jorge E Azevedo,Sandra Macedo-Ribeiro,Helder Maiato

    CLASPs are conserved microtubule plus-end-tracking proteins that suppress microtubule catastrophes and independently localize to kinetochores during mitosis. Thus, CLASPs are ideally positioned to regulate kinetochore-microtubule dynamics required for chromosome segregation fidelity, but the underlying mechanism remains unknown. Here, we found that human CLASP2 exists predominantly as a monomer in

    更新日期:2019-11-01
  • NuMA1 promotes axon initial segment assembly through inhibition of endocytosis.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-02-03
    Tomohiro Torii,Yuki Ogawa,Cheng-Hsin Liu,Tammy Szu-Yu Ho,Hamdan Hamdan,Chih-Chuan Wang,Juan A Oses-Prieto,Alma L Burlingame,Matthew N Rasband

    Axon initial segments (AISs) initiate action potentials and regulate the trafficking of vesicles between somatodendritic and axonal compartments. However, the mechanisms controlling AIS assembly remain poorly defined. We performed differential proteomics and found nuclear mitotic apparatus protein 1 (NuMA1) is downregulated in AIS-deficient neonatal mouse brains and neurons. NuMA1 is transiently located

    更新日期:2019-11-01
  • Gene expression amplification by nuclear speckle association.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Jiah Kim,Neha Chivukula Venkata,Gabriela Andrea Hernandez Gonzalez,Nimish Khanna,Andrew S Belmont

    Many active genes reproducibly position near nuclear speckles, but the functional significance of this positioning is unknown. Here we show that HSPA1B BAC transgenes and endogenous Hsp70 genes turn on 2-4 min after heat shock (HS), irrespective of their distance to speckles. However, both total HSPA1B mRNA counts and nascent transcript levels measured adjacent to the transgene are approximately twofold

    更新日期:2019-11-01
  • Autophagy and cancer: Modulation of cell death pathways and cancer cell adaptations.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Christina G Towers,Darya Wodetzki,Andrew Thorburn

    Autophagy is intricately linked with many intracellular signaling pathways, particularly nutrient-sensing mechanisms and cell death signaling cascades. In cancer, the roles of autophagy are context dependent. Tumor cell-intrinsic effects of autophagy can be both tumor suppressive and tumor promotional. Autophagy can therefore not only activate and inhibit cell death, but also facilitate the switch

    更新日期:2019-11-01
  • Ciliary force-responsive striated fibers promote basal body connections and cortical interactions.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Adam W J Soh,Teunis J P van Dam,Alexander J Stemm-Wolf,Andrew T Pham,Garry P Morgan,Eileen T O'Toole,Chad G Pearson

    Multi-ciliary arrays promote fluid flow and cellular motility using the polarized and coordinated beating of hundreds of motile cilia. Tetrahymena basal bodies (BBs) nucleate and position cilia, whereby BB-associated striated fibers (SFs) promote BB anchorage and orientation into ciliary rows. Mutants that shorten SFs cause disoriented BBs. In contrast to the cytotaxis model, we show that disoriented

    更新日期:2019-11-01
  • Cryo-EM structure of the complete and ligand-saturated insulin receptor ectodomain.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Theresia Gutmann,Ingmar B Schäfer,Chetan Poojari,Beate Brankatschk,Ilpo Vattulainen,Mike Strauss,Ünal Coskun

    Glucose homeostasis and growth essentially depend on the hormone insulin engaging its receptor. Despite biochemical and structural advances, a fundamental contradiction has persisted in the current understanding of insulin ligand-receptor interactions. While biochemistry predicts two distinct insulin binding sites, 1 and 2, recent structural analyses have resolved only site 1. Using a combined approach

    更新日期:2019-11-01
  • The liquid state of FG-nucleoporins mimics permeability barrier properties of nuclear pore complexes.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Giorgia Celetti,Giulia Paci,Joana Caria,Virginia VanDelinder,George Bachand,Edward A Lemke

    Nuclear pore complexes (NPCs) regulate all cargo traffic across the nuclear envelope. The transport conduit of NPCs is highly enriched in disordered phenylalanine/glycine-rich nucleoporins (FG-Nups), which form a permeability barrier of still elusive and highly debated molecular structure. Here we present a microfluidic device that triggered liquid-to-liquid phase separation of FG-Nups, which yielded

    更新日期:2019-11-01
  • CD2AP links actin to PI3 kinase activity to extend epithelial cell height and constrain cell area.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Yuou Wang,William M Brieher

    Maintaining the correct ratio of apical, basal, and lateral membrane domains is important for epithelial physiology. Here, we show that CD2AP is a critical determinant of epithelial membrane proportions. Depletion of CD2AP or phosphoinositide 3-kinase (PI3K) inhibition results in loss of F-actin and expansion of apical-basal domains, which comes at the expense of lateral membrane height in MDCK cells

    更新日期:2019-11-01
  • Coupling APEX labeling to imaging mass spectrometry of single organelles reveals heterogeneity in lysosomal protein turnover.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Derek P Narendra,Christelle Guillermier,Frank Gyngard,Xiaoping Huang,Michael E Ward,Matthew L Steinhauser

    Quantification of stable isotope tracers after metabolic labeling provides a snapshot of the dynamic state of living cells and tissue. A form of imaging mass spectrometry quantifies isotope ratios with a lateral resolution <50 nm, using a methodology that we refer to as multi-isotope imaging mass spectrometry (MIMS). Despite lateral resolution exceeding diffraction-limited light microscopy, lack of

    更新日期:2019-11-01
  • Topoisomerase II SUMOylation activates a metaphase checkpoint via Haspin and Aurora B kinases.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Nootan Pandey,Daniel Keifenheim,Makoto Michael Yoshida,Victoria A Hassebroek,Caitlin Soroka,Yoshiaki Azuma,Duncan J Clarke

    Topoisomerase II (Topo II) is essential for mitosis since it resolves sister chromatid catenations. Topo II dysfunction promotes aneuploidy and drives cancer. To protect from aneuploidy, cells possess mechanisms to delay anaphase onset when Topo II is perturbed, providing additional time for decatenation. Molecular insight into this checkpoint is lacking. Here we present evidence that catalytic inhibition

    更新日期:2019-11-01
  • The complexity of the serine glycine one-carbon pathway in cancer.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Miguel Reina-Campos,Maria T Diaz-Meco,Jorge Moscat

    The serine glycine and one-carbon pathway (SGOCP) is a crucially important metabolic network for tumorigenesis, of unanticipated complexity, and with implications in the clinic. Solving how this network is regulated is key to understanding the underlying mechanisms of tumor heterogeneity and therapy resistance. Here, we review its role in cancer by focusing on key enzymes with tumor-promoting functions

    更新日期:2019-11-01
  • ALK4 coordinates extracellular and intrinsic signals to regulate development of cortical somatostatin interneurons.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Christina Göngrich,Favio A Krapacher,Hermany Munguba,Diana Fernández-Suárez,Annika Andersson,Jens Hjerling-Leffler,Carlos F Ibáñez

    Although the role of transcription factors in fate specification of cortical interneurons is well established, how these interact with extracellular signals to regulate interneuron development is poorly understood. Here we show that the activin receptor ALK4 is a key regulator of the specification of somatostatin interneurons. Mice lacking ALK4 in GABAergic neurons of the medial ganglionic eminence

    更新日期:2019-11-01
  • Tumor protein D54 defines a new class of intracellular transport vesicles.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Gabrielle Larocque,Penelope J La-Borde,Nicholas I Clarke,Nicholas J Carter,Stephen J Royle

    Transport of proteins and lipids from one membrane compartment to another is via intracellular vesicles. We investigated the function of tumor protein D54 (TPD54/TPD52L2) and found that TPD54 was involved in multiple membrane trafficking pathways: anterograde traffic, recycling, and Golgi integrity. To understand how TPD54 controls these diverse functions, we used an inducible method to reroute TPD54

    更新日期:2019-11-01
  • ORP5 localizes to ER-lipid droplet contacts and regulates the level of PI(4)P on lipid droplets.
    J. Cell Biol. (IF 8.891) Pub Date : 2020-01-06
    Ximing Du,Linkang Zhou,Yvette Celine Aw,Hoi Yin Mak,Yanqing Xu,James Rae,Wenmin Wang,Armella Zadoorian,Sarah E Hancock,Brenna Osborne,Xiang Chen,Jia-Wei Wu,Nigel Turner,Robert G Parton,Peng Li,Hongyuan Yang

    Lipid droplets (LDs) are evolutionarily conserved organelles that play important roles in cellular metabolism. Each LD is enclosed by a monolayer of phospholipids, distinct from bilayer membranes. During LD biogenesis and growth, this monolayer of lipids expands by acquiring phospholipids from the endoplasmic reticulum (ER) through nonvesicular mechanisms. Here, in a mini-screen, we find that ORP5

    更新日期:2019-11-01
  • The RNA export factor Mex67 functions as a mobile nucleoporin.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-23
    Carina Patrizia Derrer,Roberta Mancini,Pascal Vallotton,Sébastien Huet,Karsten Weis,Elisa Dultz

    The RNA export factor Mex67 is essential for the transport of mRNA through the nuclear pore complex (NPC) in yeast, but the molecular mechanism of this export process remains poorly understood. Here, we use quantitative fluorescence microscopy techniques in live budding yeast cells to investigate how Mex67 facilitates mRNA export. We show that Mex67 exhibits little interaction with mRNA in the nucleus

    更新日期:2019-11-01
  • Michael Lazarou: Building a body of research.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-21
    Marie Anne O'Donnell

    Lazarou investigates the relationship between mitochondria and autophagy.

    更新日期:2019-11-01
  • A calcium message for Niemann-Pick type C.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-16
    Stephanie M Cologna

    Calcium is a ubiquitous secondary messenger that is critical for cellular function. In the highlighted article, Tiscione et al. (2019. J. Cell. Biol. https://doi.org/10.1083/jcb.201903018) describe a link between lysosomal cholesterol storage, calcium distribution alterations, and neuronal morphology in the neurodegenerative disorder Niemann-Pick type C.

    更新日期:2019-11-01
  • Glial SIK3: A central player in ion and volume homeostasis in Drosophila peripheral nerves.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-15
    Uri Kahanovitch,Michelle L Olsen

    The electrical properties of neuronal cells rely on gradients of ions across their membranes and the extracellular fluid (ECF) in which they are bathed. Little is known regarding how the ECF volume and content is maintained. In this issue, Li et al. (2019. J. Cell Biol. https://doi.org/10.1083/jcb.201907138) identify the kinase SIK3 in glia as a key signal transduction regulator in ion and volume homeostasis

    更新日期:2019-11-01
  • Getting under the skin: Cuticle damage elicits systemic autophagy response in C. elegans.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-15
    Caroline Kumsta,Malene Hansen

    In this issue, Zhang et al. (2019. J. Cell. Biol. https://doi.org/10.1083/jcb.201907196) describe a molecular mechanism by which cuticular damage in the nematode C. elegans leads to systemic induction of autophagy by signals propagated from sensory neurons via the TGF-β signaling pathway.

    更新日期:2019-11-01
  • DNA replication and mitotic entry: A brake model for cell cycle progression.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-13
    Bennie Lemmens,Arne Lindqvist

    The core function of the cell cycle is to duplicate the genome and divide the duplicated DNA into two daughter cells. These processes need to be carefully coordinated, as cell division before DNA replication is complete leads to genome instability and cell death. Recent observations show that DNA replication, far from being only a consequence of cell cycle progression, plays a key role in coordinating

    更新日期:2019-11-01
  • TFEB controls retromer expression in response to nutrient availability.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-07
    Rachel Curnock,Alessia Calcagni,Andrea Ballabio,Peter J Cullen

    Endosomal recycling maintains the cell surface abundance of nutrient transporters for nutrient uptake, but how the cell integrates nutrient availability with recycling is less well understood. Here, in studying the recycling of human glutamine transporters ASCT2 (SLC1A5), LAT1 (SLC7A5), SNAT1 (SLC38A1), and SNAT2 (SLC38A2), we establish that following amino acid restriction, the adaptive delivery of

    更新日期:2019-11-01
  • The postmitotic midbody: Regulating polarity, stemness, and proliferation.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-07
    Eric Peterman,Rytis Prekeris

    Abscission, the final stage of cell division, requires well-orchestrated changes in endocytic trafficking, microtubule severing, actin clearance, and the physical sealing of the daughter cell membranes. These processes are highly regulated, and any missteps in localized membrane and cytoskeleton dynamics often lead to a delay or a failure in cell division. The midbody, a microtubule-rich structure

    更新日期:2019-11-01
  • Confinement hinders motility by inducing RhoA-mediated nuclear influx, volume expansion, and blebbing.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-07
    Panagiotis Mistriotis,Emily O Wisniewski,Kaustav Bera,Jeremy Keys,Yizeng Li,Soontorn Tuntithavornwat,Robert A Law,Nicolas A Perez-Gonzalez,Eda Erdogmus,Yuqi Zhang,Runchen Zhao,Sean X Sun,Petr Kalab,Jan Lammerding,Konstantinos Konstantopoulos

    Cells migrate in vivo through complex confining microenvironments, which induce significant nuclear deformation that may lead to nuclear blebbing and nuclear envelope rupture. While actomyosin contractility has been implicated in regulating nuclear envelope integrity, the exact mechanism remains unknown. Here, we argue that confinement-induced activation of RhoA/myosin-II contractility, coupled with

    更新日期:2019-11-01
  • ETAA1 ensures proper chromosome segregation: A matter of S phase or mitosis?
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-07
    Marina Alejandra González Besteiro,Vanesa Gottifredi

    ETAA1 activates the master checkpoint kinase ATR. Bass and Cortez (2019. J. Cell Biol. https://doi.org/10.1083/jcb.201810058) recently reported an intra-mitotic function of ETAA1 that safeguards chromosome stability. In this issue, Achuthankutty et al. (2019. J. Cell Biol. https://doi.org/10.1083/jcb.201905064) describe a mechanism controlling the ATR-activating potential of ETAA1 in S phase to preserve

    更新日期:2019-11-01
  • Regulation of MT dynamics via direct binding of an Abl family kinase.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-07
    Yuhan Hu,Wanqing Lyu,Laura Anne Lowery,Anthony J Koleske

    Abl family kinases are essential regulators of cell shape and movement. Genetic studies revealed functional interactions between Abl kinases and microtubules (MTs), but the mechanism by which Abl family kinases regulate MTs remains unclear. Here, we report that Abl2 directly binds to MTs and regulates MT behaviors. Abl2 uses its C-terminal half to bind MTs, an interaction mediated in part through electrostatic

    更新日期:2019-11-01
  • CDK1-mediated CENP-C phosphorylation modulates CENP-A binding and mitotic kinetochore localization.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-05
    Reito Watanabe,Masatoshi Hara,Ei-Ichi Okumura,Solène Hervé,Daniele Fachinetti,Mariko Ariyoshi,Tatsuo Fukagawa

    The kinetochore is essential for faithful chromosome segregation during mitosis. To form a functional kinetochore, constitutive centromere-associated network (CCAN) proteins are assembled on the centromere chromatin that contains the centromere-specific histone CENP-A. CENP-C, a CCAN protein, directly interacts with the CENP-A nucleosome to nucleate the kinetochore structure. As CENP-C is a hub protein

    更新日期:2019-11-01
  • Vimentin protects cells against nuclear rupture and DNA damage during migration.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-11-01
    Alison E Patteson,Amir Vahabikashi,Katarzyna Pogoda,Stephen A Adam,Kalpana Mandal,Mark Kittisopikul,Suganya Sivagurunathan,Anne Goldman,Robert D Goldman,Paul A Janmey

    Mammalian cells frequently migrate through tight spaces during normal embryogenesis, wound healing, diapedesis, or in pathological situations such as metastasis. Nuclear size and shape are important factors in regulating the mechanical properties of cells during their migration through such tight spaces. At the onset of migratory behavior, cells often initiate the expression of vimentin, an intermediate

    更新日期:2019-11-01
  • Structural organization of the C1a-e-c supercomplex within the ciliary central apparatus.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-10-31
    Gang Fu,Lei Zhao,Erin Dymek,Yuqing Hou,Kangkang Song,Nhan Phan,Zhiguo Shang,Elizabeth F Smith,George B Witman,Daniela Nicastro

    Nearly all motile cilia contain a central apparatus (CA) composed of two connected singlet microtubules with attached projections that play crucial roles in regulating ciliary motility. Defects in CA assembly usually result in motility-impaired or paralyzed cilia, which in humans causes disease. Despite their importance, the protein composition and functions of the CA projections are largely unknown

    更新日期:2019-11-01
  • TGFβ-like DAF-7 acts as a systemic signal for autophagy regulation in C. elegans.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-10-30
    Yujie Zhang,Linxiang Qi,Hong Zhang

    In response to stress conditions, autophagy activity in multicellular organisms is systemically modulated to ensure maintenance of cellular homeostasis at an organismal level. Very little is known about the intercellular signals that elicit the long-range organism-wide autophagy response. Here we showed that during Caenorhabditis elegans development, loss of cuticle annular furrow collagens elicits

    更新日期:2019-11-01
  • Kazuhiro Maeshima: Excitement under the microscope.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-10-28
    Marie Anne O'Donnell

    Maeshima investigates the higher order structures and dynamics of chromatin.

    更新日期:2019-11-01
  • Delineating the contribution of Spc105-bound PP1 to spindle checkpoint silencing and kinetochore microtubule attachment regulation.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-10-28
    Babhrubahan Roy,Vikash Verma,Janice Sim,Adrienne Fontan,Ajit P Joglekar

    Accurate chromosome segregation during cell division requires the spindle assembly checkpoint (SAC), which detects unattached kinetochores, and an error correction mechanism that destabilizes incorrect kinetochore-microtubule attachments. While the SAC and error correction are both regulated by protein phosphatase 1 (PP1), which silences the SAC and stabilizes kinetochore-microtubule attachments, how

    更新日期:2019-11-01
  • Mitochondrial stress causes neuronal dysfunction via an ATF4-dependent increase in L-2-hydroxyglutarate.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-10-28
    Rachel J Hunt,Lucy Granat,Gregory S McElroy,Ramya Ranganathan,Navdeep S Chandel,Joseph M Bateman

    Mitochondrial stress contributes to a range of neurological diseases. Mitonuclear signaling pathways triggered by mitochondrial stress remodel cellular physiology and metabolism. How these signaling mechanisms contribute to neuronal dysfunction and disease is poorly understood. We find that mitochondrial stress in neurons activates the transcription factor ATF4 as part of the endoplasmic reticulum

    更新日期:2019-11-01
  • Cell polarity-dependent centrosome separation in the C. elegans embryo.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-10-28
    Alexandra Bondaz,Luca Cirillo,Patrick Meraldi,Monica Gotta

    In animal cells, faithful chromosome segregation depends on the assembly of a bipolar spindle driven by the timely separation of the two centrosomes. Here we took advantage of the highly stereotypical cell divisions in Caenorhabditis elegans embryos to identify new regulators of centrosome separation. We find that at the two-cell stage, the somatic AB cell initiates centrosome separation later than

    更新日期:2019-11-01
  • SIK3 suppresses neuronal hyperexcitability by regulating the glial capacity to buffer K+ and water.
    J. Cell Biol. (IF 8.891) Pub Date : 2019-10-28
    Hailun Li,Alexandra Russo,Aaron DiAntonio

    Glial regulation of extracellular potassium (K+) helps to maintain appropriate levels of neuronal excitability. While channels and transporters mediating K+ and water transport are known, little is understood about upstream regulatory mechanisms controlling the glial capacity to buffer K+ and osmotically obliged water. Here we identify salt-inducible kinase 3 (SIK3) as the central node in a signal

    更新日期:2019-11-01
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