journal
MENU ▼
Read by QxMD icon Read
search

Traffic

journal
https://www.readbyqxmd.com/read/29352747/clathrin-and-ap1-are-required-for-apical-sorting-of-gpi-aps-in-biosynthetic-and-recycling-routes-in-mdck-cells
#1
Guillaume Alain Castillon, Patricia Burriat-Couleru, Daniel Abegg, Nina Criado Santos, Reika Watanabe
Recently studies in animal models demonstrate potential roles for clathrin and AP1 in apical protein sorting in epithelial tissue. However, the precise functions of these proteins in apical protein transport remain unclear. Here, we reveal mis-targeting of endogenous GPI-APs and soluble secretory proteins in MDCK cells upon clathrin heavy chain or AP1 subunit knockdown (KD). Using a novel directional endocytosis and recycling assay, we found that these KD cells are not only affected for apical sorting of GPI-APs in biosynthetic pathway but also for their apical recycling and basal to apical transcytosis routes...
January 20, 2018: Traffic
https://www.readbyqxmd.com/read/29314576/rab35-gtpase-and-cancer-linking-membrane-trafficking-to-tumorigenesis
#2
REVIEW
Ronan Shaughnessy, Arnaud Echard
Rab35 is a small GTPase that is involved in many cellular processes, including membrane trafficking, cell polarity, lipid homeostasis, immunity, phagocytosis and cytokinesis. Recent studies showed that activating mutations confer Rab35 with oncogenic properties. Conversely downregulation of Rab35 inverts apico-basal cell polarity and promotes cell migration. Here we review Rab35's known functions in membrane trafficking and signaling, cell division, and cell migration in cancer cells and discuss the importance of Rab35-dependent membrane trafficking in cancer progression...
January 4, 2018: Traffic
https://www.readbyqxmd.com/read/29314494/dysregulation-of-rab5-mediated-endocytic-pathways-in-alzheimer-s-disease
#3
REVIEW
Wei Xu, Fang Fang, Jianqing Ding, Chengbiao Wu
Increasing evidence has pointed to that dysregulation of the endo-lysosomal system is an early cellular phenotype of pathogenesis for Alzheimer's disease (AD). Rab5, a small GTPase, plays a critical role in mediating these processes. Abnormal overactivation of Rab5 has been observed in post-mortem brain samples of Alzheimer's patients as well as brain samples of mouse models of AD. Recent genome-wide association studies of Alzheimer's disease have identified RIN3 (Ras and Rab Interactor 3) as a novel risk factor for the disease...
January 3, 2018: Traffic
https://www.readbyqxmd.com/read/29282820/ergosterol-is-mainly-located-in-the-cytoplasmic-leaflet-of-the-yeast-plasma-membrane
#4
Lukasz M Solanko, David P Sullivan, Yves Y Sere, Maria Szomek, Anita Lunding, Katarzyna A Solanko, Azra Pizovic, Lyubomir D Stanchev, Thomas Günther Pomorski, Anant K Menon, Daniel Wüstner
Transbilayer lipid asymmetry is a fundamental characteristic of the eukaryotic cell plasma membrane (PM). While PM phospholipid asymmetry is well documented, the transbilayer distribution of PM sterols such as mammalian cholesterol and yeast ergosterol is not reliably known. We now report that sterols are asymmetrically distributed across the yeast PM, with the majority (~80%) located in the cytoplasmic leaflet. By exploiting the sterol-auxotrophic hem1Δ yeast strain we obtained cells in which endogenous ergosterol was quantitatively replaced with dehydroergosterol (DHE), a closely related fluorescent sterol that functionally and accurately substitutes for ergosterol in vivo...
December 28, 2017: Traffic
https://www.readbyqxmd.com/read/29178177/cargo-crowding-at-actin-rich-regions-along-axons-causes-local-traffic-jams
#5
Parul Sood, Kausalya Murthy, T Vinod Kumar, Michael L Nonet, Gautam I Menon, Sandhya P Koushika
Steady axonal cargo flow is central to the functioning of healthy neurons. However, a substantial fraction of cargo in axons remains stationary up to several minutes (Kang, Tian et al. 2008, Tang, Scott et al. 2012, Tang, Scott et al. 2013, Iacobucci, Rahman et al. 2014). We examine the transport of precursors of synaptic vesicles (pre-SVs), endosomes and mitochondria in C. elegans touch receptor neurons (TRNs), showing that stationary cargo are predominantly present at actin-rich regions along the neuronal process...
November 27, 2017: Traffic
https://www.readbyqxmd.com/read/29159991/journey-to-the-centre-of-the-cell-virtual-reality-immersion-into-scientific-data
#6
REVIEW
Angus P R Johnston, James Rae, Nicholas Ariotti, Benjamin Bailey, Andrew Lija, Robyn Webb, Charles Ferguson, Sheryl Maher, Thomas P Davis, Richard I Webb, John McGhee, Robert G Parton
Visualization of scientific data is crucial not only for scientific discovery but also to communicate science and medicine to both experts and a general audience. Until recently, we have been limited to visualizing the three-dimensional (3D) world of biology in 2 dimensions. Renderings of 3D cells are still traditionally displayed using two-dimensional (2D) media, such as on a computer screen or paper. However, the advent of consumer grade virtual reality (VR) headsets such as Oculus Rift and HTC Vive means it is now possible to visualize and interact with scientific data in a 3D virtual world...
November 21, 2017: Traffic
https://www.readbyqxmd.com/read/29135085/retromer-and-the-cimpr-time-for-a-trial-separation
#7
Matthew N J Seaman
The retromer cargo-selective complex (CSC) comprising Vps35, Vps29 and Vps26 mediates the endosome-to-Golgi retrieval of the cation-independent mannose 6-phosphate receptor (CIMPR). Or does it? Recently published data has questioned the validity of this long established theory. Here the evidence for and against a role for the retromer CSC in CIMPR endosome-to-Golgi retrieval is examined in the light of the new data that the SNX-BAR dimer is actually responsible for CIMPR retrieval.
November 14, 2017: Traffic
https://www.readbyqxmd.com/read/29135058/distinct-features-of-multivesicular-body-lysosome-fusion-revealed-by-a-new-cell-free-content-mixing-assay
#8
Mahmoud Abdul Karim, Dieter Ronny Samyn, Sevan Mattie, Christopher Leonard Brett
When marked for degradation, surface receptor and transporter proteins are internalized and delivered to endosomes where they are packaged into intralumenal vesicles (ILVs). Many rounds of ILV formation create multivesicular bodies (MVBs) that fuse with lysosomes exposing ILVs to hydrolases for catabolism. Despite being critical for protein degradation, the molecular underpinnings of MVB-lysosome fusion remain unclear, although machinery underlying other lysosome fusion events is implicated. But how then is specificity conferred? And how is MVB maturation and fusion coordinated for efficient protein degradation? To address these questions, we developed a cell-free MVB-lysosome fusion assay using S...
November 14, 2017: Traffic
https://www.readbyqxmd.com/read/29120102/deciphering-lipid-codes-k-ras-as-a-paradigm
#9
REVIEW
Yong Zhou, John F Hancock
The cell plasma membrane (PM) is a highly dynamic and heterogeneous lipid environment, driven by complex hydrophobic and electrostatic interactions among the hundreds of types of lipid species. Although the biophysical processes governing lipid lateral segregation in the cell PM have been established in vitro, biological implications of lipid heterogeneity are poorly understood. Of particular interest is how membrane proteins potentially utilize transient spatial clustering of PM lipids to regulate function...
November 9, 2017: Traffic
https://www.readbyqxmd.com/read/29112302/tmd1-domain-and-crac-motif-determine-the-association-and-disassociation-of-mxirt1-with-detergent-resistant-membranes
#10
Song Tan, Peng Zhang, Wei Xiao, Bing Feng, Lan-You Chen, Shuang Li, Peng Li, Wei-Zhong Zhao, Xiao-Ting Qi, Li-Ping Yin
Iron is essential for most living organisms. The iron-regulated transporter1 (IRT1) plays a major role in iron uptake in roots, and its trafficking from endoplasmic reticulum (ER) to plasma membrane (PM) is tightly coordinated with changes in iron environment. However, studies on IRT1 response are limited. Here, we report that Malus xiaojinesis IRT1 (MxIRT1) associates with detergent-resistant membranes (DRMs, a biochemical counterpart of PM microdomains), whereas the PM microdomains are known platforms for signal transduction in the PM...
November 7, 2017: Traffic
https://www.readbyqxmd.com/read/29105235/the-biology-and-polymer-physics-underlying-large-scale-chromosome-organization
#11
REVIEW
Shelley Sazer, Helmut Schiessel
Chromosome large-scale organization is a beautiful example of the interplay between physics and biology. DNA molecules are polymers and thus belong to the class of molecules for which physicists have developed models and formulated testable hypotheses to understand their arrangement and dynamic properties in solution, based on the principles of polymer physics. Biologists documented and discovered the biochemical basis for the structure, function and dynamic spatial organization of chromosomes in cells. The underlying principles of chromosome organization have recently been revealed in unprecedented detail using high-resolution chromosome capture technology that can simultaneously detect chromosome contact sites throughout the genome...
November 3, 2017: Traffic
https://www.readbyqxmd.com/read/29077261/tau-directs-intracellular-trafficking-by-regulating-the-forces-exerted-by-kinesin-and-dynein-teams
#12
Abdullah R Chaudhary, Florian Berger, Christopher L Berger, Adam G Hendricks
Organelles, proteins, and mRNA are transported bidirectionally along microtubules by plus-end directed kinesin and minus-end directed dynein motors. Microtubules are decorated by microtubule-associated proteins (MAPs) that organize the cytoskeleton, regulate microtubule dynamics and modulate the interaction between motor proteins and microtubules to direct intracellular transport. Tau is a neuronal MAP that stabilizes axonal microtubules and crosslinks them into bundles. Dysregulation of tau leads to a range of neurodegenerative diseases known as tauopathies including Alzheimer's disease (AD)...
October 27, 2017: Traffic
https://www.readbyqxmd.com/read/28945316/diatrack-particle-tracking-software-review-of-applications-and-performance-evaluation
#13
Pascal Vallotton, Antoine M van Oijen, Cynthia B Whitchurch, Vladimir Gelfand, Leslie Yeo, Georgios Tsiavaliaris, Stephanie Heinrich, Elisa Dultz, Karsten Weis, David Grünwald
Object tracking is an instrumental tool supporting studies of cellular trafficking. There are three challenges in object tracking: the identification of targets; the precise determination of their position and boundaries; and the assembly of correct trajectories. This last challenge is particularly relevant when dealing with densely populated images with low signal-to-noise ratios-conditions that are often encountered in applications such as organelle tracking, virus particle tracking or single-molecule imaging...
December 2017: Traffic
https://www.readbyqxmd.com/read/28941293/cdk5-dependent-activation-of-dynein-in-the-axon-initial-segment-regulates-polarized-cargo-transport-in-neurons
#14
Eva Klinman, Mariko Tokito, Erika L F Holzbaur
The unique polarization of neurons depends on selective sorting of axonal and somatodendritic cargos to their correct compartments. Axodendritic sorting and filtering occurs within the axon initial segment (AIS). However, the underlying molecular mechanisms responsible for this filter are not well understood. Here, we show that local activation of the neuronal-specific kinase cyclin-dependent kinase 5 (CDK5) is required to maintain AIS integrity, as depletion or inhibition of CDK5 induces disordered microtubule polarity and loss of AIS cytoskeletal structure...
December 2017: Traffic
https://www.readbyqxmd.com/read/28869701/nup42-and-ip6-coordinate-gle1-stimulation-of-dbp5-ddx19b-for-mrna-export-in-yeast-and-human-cells
#15
Rebecca L Adams, Aaron C Mason, Laura Glass, Aditi, Susan R Wente
The mRNA lifecycle is driven through spatiotemporal changes in the protein composition of mRNA particles (mRNPs) that are triggered by RNA-dependent DEAD-box protein (Dbp) ATPases. As mRNPs exit the nuclear pore complex (NPC) in Saccharomyces cerevisiae, this remodeling occurs through activation of Dbp5 by inositol hexakisphosphate (IP6 )-bound Gle1. At the NPC, Gle1 also binds Nup42, but Nup42's molecular function is unclear. Here we employ the power of structure-function analysis in S. cerevisiae and human (h) cells, and find that the high-affinity Nup42-Gle1 interaction is integral to Dbp5 (hDDX19B) activation and efficient mRNA export...
December 2017: Traffic
https://www.readbyqxmd.com/read/28755404/the-dense-core-vesicle-maturation-protein-cccp-1-binds-rab-2-and-membranes-through-its-c-terminal-domain
#16
Jérôme Cattin-Ortolá, Irini Topalidou, Annie Dosey, Alexey J Merz, Michael Ailion
Dense-core vesicles (DCVs) are secretory organelles that store and release modulatory neurotransmitters from neurons and endocrine cells. Recently, the conserved coiled-coil protein CCCP-1 was identified as a component of the DCV biogenesis pathway in the nematode Caenorhabditis elegans. CCCP-1 binds the small GTPase RAB-2 and colocalizes with it at the trans-Golgi. Here, we report a structure-function analysis of CCCP-1 to identify domains of the protein important for its localization, binding to RAB-2, and function in DCV biogenesis...
November 2017: Traffic
https://www.readbyqxmd.com/read/29044966/v1b-vasopressin-receptor-trafficking-and-signaling%C3%A2-role-of-arrestins-g-proteins-and-src-kinase
#17
Sanja Perkovska, Catherine Méjean, Mohammed Akli Ayoub, Juan Li, Floriane Hemery, Maithé Corbani, Nadine Laguette, Maria-Angeles Ventura, Hélène Orcel, Thierry Durroux, Bernard Mouillac, Christiane Mendre
The signaling pathway of G protein-coupled receptors (GPCRs) is strongly linked to their trafficking profile. Little is known about the molecular mechanisms involved in the vasopressin receptor V1b subtype (V1b R) trafficking and its impact on receptor signaling and regulation. For this purpose, we investigated the role of β-arrestins in receptor desensitization, internalization and recycling and attempted to dissect the V1b R-mediated MAP Kinase pathway. Using β-arrestin 1-2 KO-MEF cells, we demonstrated that both β-arrestin 1 and 2 play a fundamental role in internalization and recycling of V1b R with a rapid and transient V1b R-β-arrestin interaction in contrast to a slow and long-lasting β-arrestin recruitment of the V2 vasopressin receptor subtype (V2 R)...
October 16, 2017: Traffic
https://www.readbyqxmd.com/read/29044909/recruitment-of-7sl-rna-to-assembling-hiv-1-virus-like-particles
#18
Michelle S Itano, Helene Arnion, Sandra L Wolin, Sanford M Simon
Retroviruses incorporate specific host cell RNAs into virions. In particular, the host noncoding 7SL RNA is highly abundant in all examined retroviruses compared to its cellular levels or relative to common mRNAs such as actin. Using live cell imaging techniques, we have determined that the 7SL RNA does not arrive with the HIV-1 RNA genome. Instead, it is recruited contemporaneous with assembly of the protein HIV-1 Gag at the plasma membrane. Further, we demonstrate that complexes of 7SL RNA and Gag can be immunoprecipitated from both cytosolic and plasma membrane fractions...
October 16, 2017: Traffic
https://www.readbyqxmd.com/read/28991411/structural-insights-into-the-nuclear-import-of-the-histone-acetyltransferase-mof-by-importin-%C3%AE-1
#19
Weili Zheng, Rui Wang, Xi Liu, Siyu Tian, Benqiang Yao, Ang Chen, Shikai Jin, Yong Li
The histone acetyltransferase MOF (males-absent-on-the-first) acetylates the histone H4, a modification important for many biological processes, including chromatin organization, transcriptional regulation, DNA replication, recombination and repair, as well as autophagy. Depletion of MOF induces serious consequences due to the reduction of histone acetylation, such as nuclear morphological defects and cancer. Despite the critical roles of MOF in the nucleus, the structural or functional mechanisms of the nucleocytoplasmic transport of MOF remain elusive...
October 9, 2017: Traffic
https://www.readbyqxmd.com/read/28985008/transcellular-vesicular-transport-in-epithelial-and-endothelial-cells-challenges-and-opportunities
#20
REVIEW
Karen Y Fung, Gregory D Fairn, Warren L Lee
Vesicle-mediated transcellular transport or simply "transcytosis" is a cellular process used to shuttle macromolecules such as lipoproteins, antibodies, and albumin from one surface of a polarized cell to the other. This mechanism is in contrast to the transit of small molecules such as anions, cations and amino acids that occur via uptake, diffusion through the cytosol and release and is also distinct from paracellular leak between cells. Importantly, transcytosis has evolved as a process to selectively move macromolecules between two neighboring yet unique microenvironments within a multicellular organism...
October 6, 2017: Traffic
journal
journal
34949
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"