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https://www.readbyqxmd.com/read/29351565/sumo-targeting-of-a-stress-tolerant-ulp1-sumo-protease
#1
Jennifer Peek, Catherine Harvey, Dreux Gray, Danny Rosenberg, Likhitha Kolla, Reuben Levy-Myers, Rui Yin, Jonathan L McMurry, Oliver Kerscher
SUMO proteases of the SENP/Ulp family are master regulators of both sumoylation and desumoylation and regulate SUMO homeostasis in eukaryotic cells. SUMO conjugates rapidly increase in response to cellular stress, including nutrient starvation, hypoxia, osmotic stress, DNA damage, heat shock, and other proteotoxic stressors. Nevertheless, little is known about the regulation and targeting of SUMO proteases during stress. To this end we have undertaken a detailed comparison of the SUMO-binding activity of the budding yeast protein Ulp1 (ScUlp1) and its ortholog in the thermotolerant yeast Kluyveromyces marxianus, KmUlp1...
2018: PloS One
https://www.readbyqxmd.com/read/29351512/physiology-of-astroglia
#2
Alexei Verkhratsky, Maiken Nedergaard
Astrocytes are neural cells of ectodermal, neuroepithelial origin that provide for homeostasis and defense of the central nervous system (CNS). Astrocytes are highly heterogeneous in morphological appearance; they express a multitude of receptors, channels, and membrane transporters. This complement underlies their remarkable adaptive plasticity that defines the functional maintenance of the CNS in development and aging. Astrocytes are tightly integrated into neural networks and act within the context of neural tissue; astrocytes control homeostasis of the CNS at all levels of organization from molecular to the whole organ...
January 1, 2018: Physiological Reviews
https://www.readbyqxmd.com/read/29350922/computing-curvature-sensitivity-of-biomolecules-in-membranes-by-simulated-buckling
#3
Federico Elias-Wolff, Martin Lindén, Alexander P Lyubartsev, Erik G Brandt
Membrane curvature sensing, where the binding free energies of membrane-associated molecules depend on the local membrane curvature, is a key factor to modulate and maintain the shape and organization of cell membranes. However, the microscopic mechanisms are not well understood, partly due to absence of efficient simulation methods. Here, we describe a method to compute the curvature dependence of the binding free energy of a membrane-associated probe molecule that interacts with a buckled membrane, which has been created by lateral compression of a flat bilayer patch...
January 19, 2018: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29350282/neutrophil-chemotaxis
#4
REVIEW
Björn Petri, Maria-Jesús Sanz
Neutrophils are the primary cells recruited to inflamed sites during an innate immune response to tissue damage and/or infection. They are finely sensitive to inciting stimuli to reach in great numbers and within minutes areas of inflammation and tissue insult. For this effective response, they can detect extracellular chemical gradients and move towards higher concentrations, the so-called chemotaxis process or guided cell migration. This directed neutrophil recruitment is orchestrated by chemoattractants, a chemically diverse group of molecular guidance cues (e...
January 19, 2018: Cell and Tissue Research
https://www.readbyqxmd.com/read/29350259/diminished-expression-of-%C3%AE-2-gpi-is-associated-with-a-reduced-ability-to-mitigate-complement-activation-in-anti-gpiib-iiia-mediated-immune-thrombocytopenia
#5
Xiaolu Zhu, Jiamin Zhang, Qianming Wang, Haixia Fu, Yingjun Chang, Yuan Kong, Meng Lv, Lanping Xu, Kaiyan Liu, Xiaojun Huang, Xiaohui Zhang
Anti-GPIIb/IIIa-mediated complement activation has been reported to be important in the pathogenesis of immune thrombocytopenia (ITP). However, the role of the complement system and the involved regulatory mechanism remain equivocal. Beta2-glycoprotein I (β2-GPI), known as the main target for antiphospholipid autoantibodies, has been demonstrated as a complement regulator. Here, we investigated the complement-regulatory role of β2-GPI in anti-GPIIb/IIIa-mediated ITP. Plasma complement activation and enhanced complement activation capacity (CAC) were found in ITP patients with anti-GPIIb/IIIa antibodies in vivo and in vitro...
December 29, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/29348591/relapsing-remitting-multiple-sclerosis-diagnosis-from-cerebrospinal-fluids-via-fourier-transform-infrared-spectroscopy-coupled-with-multivariate-analysis
#6
Dilek Yonar, Levent Ocek, Bedile Irem Tiftikcioglu, Yasar Zorlu, Feride Severcan
Multiple sclerosis (MS) is a chronic, progressive, inflammatory and degenerative disease of central nervous system. Here, we aimed to develop a method for differential diagnosis of Relapsing-Remitting MS (RRMS) and clinically isolated syndrome (CIS) patients, as well as to identify CIS patients who will progress to RRMS, from cerebrospinal fluid (CSF) by infrared (IR) spectroscopy and multivariate analysis. Spectral analyses demonstrated significant differences in the molecular contents, especially in the lipids and Z conformation of DNA of CSF from CIS, CIS to RRMS transformed (TCIS) and RRMS groups...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348261/complement-receptor-c5ar1-plays-an-evolutionarily-conserved-role-in-successful-cardiac-regeneration
#7
Niranjana Natarajan, Yamen Abbas, Donald M Bryant, Juan Manuel Gonzalez-Rosa, Michka Sharpe, Aysu Uygur, Lucas H Cocco-Delgado, Nhi Ngoc Ho, Norma P Gerard, Craig J Gerard, Calum A Macrae, Caroline E Burns, C Geoffrey Burns, Jessica L Whited, Richard T Lee
Background -Defining conserved molecular pathways in animal models of successful cardiac regeneration could yield insight into why adult mammals have inadequate cardiac regeneration after injury. Insight into the transcriptomic landscape of early cardiac regeneration from model organisms will shed light on evolutionarily conserved pathways in successful cardiac regeneration. Methods -Here we describe a cross-species transcriptomic screen in three model organisms for cardiac regeneration -axolotl, neonatal mice and zebrafish...
January 18, 2018: Circulation
https://www.readbyqxmd.com/read/29347420/bayesian-inference-with-information-content-model-check-for-langevin-equations
#8
Jens Krog, Michael A Lomholt
The Bayesian data analysis framework has been proven to be a systematic and effective method of parameter inference and model selection for stochastic processes. In this work, we introduce an information content model check that may serve as a goodness-of-fit, like the χ^{2} procedure, to complement conventional Bayesian analysis. We demonstrate this extended Bayesian framework on a system of Langevin equations, where coordinate-dependent mobilities and measurement noise hinder the normal mean-squared displacement approach...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347187/mean-field-dynamics-of-a-population-of-stochastic-map-neurons
#9
Igor Franović, Oleg V Maslennikov, Iva Bačić, Vladimir I Nekorkin
We analyze the emergent regimes and the stimulus-response relationship of a population of noisy map neurons by means of a mean-field model, derived within the framework of cumulant approach complemented by the Gaussian closure hypothesis. It is demonstrated that the mean-field model can qualitatively account for stability and bifurcations of the exact system, capturing all the generic forms of collective behavior, including macroscopic excitability, subthreshold oscillations, periodic or chaotic spiking, and chaotic bursting dynamics...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347067/isotropic-nematic-transition-for-hard-rods-on-a-three-dimensional-cubic-lattice
#10
A Gschwind, M Klopotek, Y Ai, M Oettel
Using grand-canonical Monte Carlo (GCMC) simulations, we investigate the isotropic-nematic phase transition for hard rods of size L×1×1 on a three-dimensional cubic lattice. We observe such a transition for L≥6. For L=6, the nematic state has a negative order parameter, reflecting the co-occurrence of two dominating orientations. For L≥7, the nematic state has a positive order parameter, corresponding to the dominance of one orientation. We investigate rod lengths up to L=25 and find evidence for a very weakly first-order isotropic-nematic transition, while we cannot completely rule out a second-order transition...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346666/gypsy-roma-and-traveller-access-to-and-engagement-with-health-services-a-systematic-review
#11
Alison McFadden, Lindsay Siebelt, Anna Gavine, Karl Atkin, Kerry Bell, Nicola Innes, Helen Jones, Cath Jackson, Haggi Haggi, Steve MacGillivray
Background: Gypsy, Roma and Traveller people represent the most disadvantaged minority groups in Europe, having the poorest health outcomes. This systematic review addressed the question of how Gypsy, Roma and Traveller people access healthcare and what are the best ways to enhance their engagement with health services. Methods: Searches were conducted in 21 electronic databases complemented by a focussed Google search. Studies were included if they had sufficient focus on Gypsy, Roma or Traveller populations; reported data pertinent to healthcare service use or engagement and were published in English from 2000 to 2015...
February 1, 2018: European Journal of Public Health
https://www.readbyqxmd.com/read/29346652/toward-rational-antibody-design-recent-advancements-in-molecular-dynamics-simulations
#12
Takefumi Yamashita
Because antibodies have become an important therapeutic tool, rational antibody design is a challenging issue involving various science and technology fields. From the computational aspect, many types of design-assist methods have been developed, but their accuracy is not fully satisfactory. Because of recent advancements in computational power, molecular dynamics (MD) simulation has become a helpful tool to trace the motion of proteins and to characterize their properties. Thus, MD simulation has been applied to various systems involving antigen-antibody complexes and has been shown to provide accurate insight into antigen-antibody interactions and dynamics at an atomic resolution...
January 15, 2018: International Immunology
https://www.readbyqxmd.com/read/29346632/diagnostic-and-prognostic-value-of-jc-virus-dna-in-plasma-in-progressive-multifocal-leukoencephalopathy
#13
Francesca Ferretti, Arabella Bestetti, Constantin T Yiannoutsos, Beverly S Musick, Simonetta Gerevini, Laura Passeri, Simona Bossolasco, Antonio Boschini, Diego Franciotta, Adriano Lazzarin, Paola Cinque
Background: Progressive multifocal leukoencephalopathy (PML) is a severe demyelinating disease caused by the polyomavirus JC (JCV) affecting subjects with impaired immune system. While JCV-DNA detection in cerebrospinal fluid (CSF) is diagnostic of PML, the clinical significance of plasma JCV-DNA is still uncertain. Methods: We retrospectively analyzed plasma samples drawn from patients with PML close to disease onset, and controls without PML. In PML patients, we compared plasma JCV DNA detection and levels to: JCV DNA in the other biological samples, clinical and laboratory parameters and patients' survival...
January 15, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29345622/position-paper-on-nasal-obstruction-evaluation-and-treatment
#14
REVIEW
A Valero, A M Navarro, A Del Cuvillo, I Alobid, J R Benito, C Colás, G de Los Santos, R Fernández Liesa, A García-Lliberós, R González-Pérez, A Izquierdo-Domínguez, A Jurado-Ramos, M M Lluch-Bernal, J R Montserrat Gili, J Mullol, A Puiggròs Casas, M C Sánchez-Hernández, F Vega, J M Villacampa, M Armengot-Carceller, M T Dordal
Nasal obstruction (NO) is defined as the subjective perception of discomfort or difficulty in the passage of air through the nostrils. It is a common reason for consultation in primary and specialized care, and it may affect up to 30-40% of the population. It affects the quality of life (it especially disturbs sleep) and lowers work efficiency. The aim of this document is to agree on how to treat NO, establish a methodology for evaluating and diagnosing it, and define an individualized approach to its treatment...
January 18, 2018: Journal of Investigational Allergology & Clinical Immunology
https://www.readbyqxmd.com/read/29343892/first-two-bilateral-hand-transplantations-in-india-part-4-immediate-post-operative-care-immunosuppression-protocol-and-monitoring
#15
Subramania Iyer, Mohit Sharma, P Kishore, Jimmy Mathew, R Janarthanan, Raghuveer Reddy, Abhijeet Wakure, Sundeep Vijayaraghavan, S M Chetan Mali, Visakh Varma, Ashish Chaudhari, Swapnil Dhake, Akshay Omkumar, George Kurian, Rajesh Nair, Anil Mathew, Zachariah Paul, Malini Eapen, Lalitha Biswas
Introduction: Being able to counter immune-mediated rejection has for decades been the single largest obstacle for the progress of vascular composite allotransplantation (VCA). The human immune system performs the key role of differentiating the 'self ' from the 'non-self '. This, although is quintessential to eliminate or resist infections, also resists the acceptance of an allograft which it promptly recognises as 'non-self'. Materials and Methods: Pre-operative evaluation of the recipient evaluation included immunological assessment in the form of panel reactive antibodies (PRA), human leucocyte antigen (HLA) typing, donor-specific antibody detection assays (DSA) and complement-dependent cytotoxicity assays (CDC)...
May 2017: Indian Journal of Plastic Surgery: Official Publication of the Association of Plastic Surgeons of India
https://www.readbyqxmd.com/read/29343682/intermittent-c1-inhibitor-deficiency-associated-with-recessive-inheritance-functional-and-structural-insight
#16
Sonia Caccia, Chiara Suffritti, Thomas Carzaniga, Romina Berardelli, Silvia Berra, Vincenzo Martorana, Annamaria Fra, Christian Drouet, Marco Cicardi
C1-inhibitor is a serine protease inhibitor (serpin) controlling complement and contact system activation. Gene mutations result in reduced C1-inhibitor functional plasma level causing hereditary angioedema, a life-threatening disorder. Despite a stable defect, the clinical expression of hereditary angioedema is unpredictable, and the molecular mechanism underlying this variability remains undisclosed. Here we report functional and structural studies on the Arg378Cys C1-inhibitor mutant found in a patient presenting reduced C1-inhibitor levels, episodically undergoing normalization...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343668/configuration-of-the-sugar-head-of-glycolipids-in-thylakoid-membranes
#17
Egi Tritya Apdila, Koichiro Awai
Glycolipids constitute the majority of membrane components in oxygenic photosynthetic organisms, whereas they are minor lipids in other organisms. In cyanobacteria, three glycolipids comprise ~90 mol% of the total lipids in thylakoid membranes, where photosynthetic electron transport occurs. Among these glycolipids, 80 mol% are galactolipids (monogalactosyldiacylglycerol and digalactosyldiacylglycerol). Galactolipids are well conserved in oxygenic photosynthetic organisms and are believed to be essential for the integrity of the membrane system...
January 17, 2018: Genes & Genetic Systems
https://www.readbyqxmd.com/read/29343645/crystal-structure-of-the-mammalian-lipopolysaccharide-detoxifier
#18
Alexei Gorelik, Katalin Illes, Bhushan Nagar
LPS is a potent bacterial endotoxin that triggers the innate immune system. Proper recognition of LPS by pattern-recognition receptors requires a full complement of typically six acyl chains in the lipid portion. Acyloxyacyl hydrolase (AOAH) is a host enzyme that removes secondary (acyloxyacyl-linked) fatty acids from LPS, rendering it immunologically inert. This activity is critical for recovery from immune tolerance that follows Gram-negative infection. To understand the molecular mechanism of AOAH function, we determined its crystal structure and its complex with LPS...
January 17, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29343274/coexistent-sickle-cell-anemia-and-autoimmune-disease-in-eight-children-pitfalls-and-challenges
#19
Valerie Li-Thiao-Te, Florence Uettwiller, Pierre Quartier, Florence Lacaille, Brigitte Bader-Meunier, Valentine Brousse, Mariane de Montalembert
BACKGROUND: Patients with sickle cell disease (SCD) present a defective activation of the alternate complement pathway that increases the risk of infection and is thought to predispose to autoimmune disease (AID). However, coexisting AID and SCD is rarely reported, suggesting possible underdiagnosis due to an overlapping of the symptoms. STUDY DESIGN: Among 603 patients with SCD followed between 1999 and June 2016, we retrospectively searched for patients with coexisting SCD and AID...
January 17, 2018: Pediatric Rheumatology Online Journal
https://www.readbyqxmd.com/read/29341926/direct-detection-of-carbon-and-nitrogen-nuclei-for-high-resolution-analysis-of-intrinsically-disordered-proteins-using-nmr-spectroscopy
#20
E B Gibbs, R W Kriwacki
Nuclear magnetic resonance spectroscopy (NMR) is a powerful technique for characterizing the structural and dynamic properties of intrinsically disordered proteins and protein regions (IDPs & IDRs). However, the application of NMR to IDPs has been limited by poor chemical shift dispersion in two-dimensional (2D) 1H-15N heteronuclear correlation spectra. Among the various detection schemes available for heteronuclear correlation spectroscopy, 13C direct-detection has become a mainstay for investigations of IDPs owing to the favorable chemical shift dispersion in 2D 13C'-15N correlation spectra...
January 13, 2018: Methods: a Companion to Methods in Enzymology
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