keyword
MENU ▼
Read by QxMD icon Read
search

Host Pathogen Dynamics

keyword
https://www.readbyqxmd.com/read/28220430/using-clear-nail-polish-to-make-arabidopsis-epidermal-impressions-for-measuring-the-change-of-stomatal-aperture-size-in-immune-response
#1
Shuchi Wu, Bingyu Zhao
Plant stomata are an essential route for bacterial pathogens to entry inside host tissue and cause diseases. As an important defense mechanism, plant stomata can actively restrict bacterial invasion by dynamically regulating the opening, closing, and reopening of stomatal guard cells. Therefore, accurately measuring the stomatal aperture size during the bacterial pathogenesis is an important approach to study the stomata related immunity. Several methods have been developed for stomatal aperture measurement...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28220138/de-novo-transcriptome-assembly-of-phomopsis-liquidambari-provides-insights-into-genes-associated-with-different-lifestyles-in-rice-oryza-sativa-l
#2
Jun Zhou, Xin Li, Yan Chen, Chuan-Chao Dai
The mechanisms that trigger the switch from endophytic fungi to saprophytic fungi are largely unexplored. Broad host range Phomopsis liquidambari is established in endophytic and saprophytic systems with rice (Oryza sativa L.). Endophytic P. liquidambari promotes rice growth, increasing rice yield and improving the efficiency of nitrogen fertilizer. This species's saprophytic counterpart can decompose rice litterfall, promoting litter organic matter cycling and the release of nutrients and improving the soil microbial environment...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28217934/population-dynamics-of-wild-rodents-induce-stochastic-fadeouts-of-a-zoonotic-pathogen
#3
Giorgio Guzzetta, Valentina Tagliapietra, Sarah E Perkins, Heidi C Hauffe, Piero Poletti, Stefano Merler, Annapaola Rizzoli
Stochastic processes play an important role in the infectious disease dynamics of wildlife, especially in species subject to large population oscillations. Here we study the case of a free ranging population of yellow-necked mice (Apodemus flavicollis) in northern Italy, where circulation of Dobrava-Belgrade hantavirus (DOBV) has been detected intermittently since 2001, until an outbreak emerged in 2010. We analyzed the transmission dynamics of the recent outbreak using a computational model that accounts for seasonal changes of the host population and territorial behavior...
February 19, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28215292/emergent-role-of-coronin-1a-in-neuronal-signaling
#4
M Martorella, K Barford, B Winkler, C D Deppmann
The Coronin family of proteins were first noted for their role in pathogen-host interactions and for modulating actin dynamics. Recently, however, Coronins have been found in a greater variety of cell types, and novel roles for the Coronins within the nervous system have been discovered. In the immune system, Coronin-1a enables Mycobacterium tuberculosis to evade lysosomal destruction. This activity appears to be analogous to protection of the NGF-TrkA signaling endosome during sympathetic nervous system development that is required for survival signaling...
2017: Vitamins and Hormones
https://www.readbyqxmd.com/read/28214736/breaking-the-population-barrier-by-single-cell-analysis-one-host-against-one-pathogen
#5
REVIEW
Erez Mills, Roi Avraham
Most of our understanding of the host-bacterium interaction has come from studies of bulk populations. In reality, highly adaptable and dynamic host cells and bacteria engage in complex, diverse interactions. This complexity necessarily limits the depth of understanding that can be gained with bulk population measurements. Here, we will review the merit of single cell analysis to characterize this diversity that can trigger heterogeneous outcomes. We will discuss heterogeneity of bacterial and host populations, differences in host microenvironments, technological advances that facilitate the analysis of rare subpopulations, and the potential relevance of these subpopulations to infection outcomes...
February 16, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/28213104/isolation-and-characterization-of-a-virulent-bacteriophage-infecting-acinetobacter-johnsonii-from-activated-sludge
#6
Niansi Fan, Rong Qi, Min Yang
A double-stranded DNA phage named AJO1, infecting Acinetobacter johnsonii, which plays an important role in wastewater treatment, was isolated from activated sludge in a full-scale municipal wastewater treatment plant. Based on morphological taxonomy, AJO1, with an icosahedral head 55 ± 2 nm in diameter and a non-contractile tail 8 ± 2 nm in length, was classified as a member of the Podoviridae family. Bacterial infection characteristics were as follows: no polyvalent infectivity, optimal multiplicity of infection of 10(-2); eclipse and burst size of 30 min and 51...
February 14, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28211052/life-history-strategy-determines-constraints-on-immune-function
#7
Benjamin J Parker, Seth M Barribeau, Alice M Laughton, Lynn H Griffin, Nicole M Gerardo
1)Determining the factors governing investment in immunity is critical for understanding host-pathogen ecological and evolutionary dynamics. Studies often consider disease resistance in the context of life-history theory, with the expectation that investment in immunity will be optimized in anticipation of disease risk. Immunity, however, is constrained by context-dependent fitness costs. How the costs of immunity vary across life-history strategies has yet to be considered. 2)Pea aphids are typically unwinged but produce winged offspring in response to high population densities and deteriorating conditions...
February 17, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28209713/mir-718-represses-pro-inflammatory-cytokine-production-through-targeting-pten
#8
Parisa Kalantari, Omid F Harandi, Sarika Agarwal, Florentina Rus, Evelyn A Kurt-Jones, Katherine A Fitzgerald, Daniel R Caffrey, Douglas T Golenbock
Bacterial sepsis involves a complex interaction between the host immune response and bacterial lipopolysaccharides (LPS). LPS binds Toll-like receptor (TLR) 4, which leads to the release of pro-inflammatory cytokines that are essential for a potent innate immune response against pathogens. The innate immune system is tightly regulated as excessive inflammation can lead to organ failure and death. MicroRNAs have recently emerged as important regulators of the innate immune system. Here, we determined the function of miR-718, which is conserved across mammals and overlaps with the 5 UTR of the Interleukin-1 Receptor-Associated Kinase (IRAK1) gene...
February 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28207860/effect-of-human-cytomegalovirus-hcmv-us27-on-cxcr4-receptor-internalization-measured-by-fluorogen-activating-protein-fap-biosensors
#9
Jordan M Boeck, Juliet V Spencer
Human cytomegalovirus (HCMV) is a widespread pathogen and a member of the Herpesviridae family. HCMV has a large genome that encodes many genes that are non-essential for virus replication but instead play roles in manipulation of the host immune environment. One of these is the US27 gene, which encodes a protein with homology to the chemokine receptor family of G protein-coupled receptors (GPCRs). The US27 protein has no known chemokine ligands but can modulate the signaling activity of host receptor CXCR4...
2017: PloS One
https://www.readbyqxmd.com/read/28205516/a-viral-protease-relocalizes-in-the-presence-of-the-vector-to-promote-vector-performance
#10
Aurélie Bak, Andrea L Cheung, Chunling Yang, Steven A Whitham, Clare L Casteel
Vector-borne pathogens influence host characteristics relevant to host-vector contact, increasing pathogen transmission and survival. Previously, we demonstrated that infection with Turnip mosaic virus, a member of one of the largest families of plant-infecting viruses, increases vector attraction and reproduction on infected hosts. These changes were due to a single viral protein, NIa-Pro. Here we show that NIa-Pro responds to the presence of the aphid vector during infection by relocalizing to the vacuole...
February 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28205249/exploration-micromechanism-of-vp35-iid-interaction-and-recognition-dsrna-a-molecular-dynamics-simulation
#11
Yan-Jun Zhang, Jing-Na Ding, Hui Zhong, Ju-Guang Han
Multifunctional viral protein (VP35) encoded by the highly pathogenic Ebola viruses (EBOVs) can antagonize host double-stranded RNA (dsRNA) sensors and immune response because of the simultaneous recognition of dsRNA backbone and blunt ends. Mutation of select hydrophobic conserved basic residues within the VP35 inhibitory domain (IID) abrogates its dsRNA-binding activity, and impairs VP35-mediated interferon (IFN) antagonism. Herein the detailed binding mechanism between dsRNA and WT, single mutant, and double mutant were investigated by all-atom molecular dynamics (MD) simulation and binding energy calculation...
February 16, 2017: Proteins
https://www.readbyqxmd.com/read/28198671/transcriptome-analysis-reveals-dynamic-changes-in-coxsackievirus-a16-infected-hek-293t-cells
#12
Jun Jin, Rujiao Li, Chunlai Jiang, Ruosi Zhang, Xiaomeng Ge, Fang Liang, Xin Sheng, Wenwen Dai, Meili Chen, Jiayan Wu, Jingfa Xiao, Weiheng Su
BACKGROUND: Coxsackievirus A16 (CVA16) and enterovirus 71 (EV71) are two of the major causes of hand, foot and mouth disease (HFMD) world-wide. Although many studies have focused on infection and pathogenic mechanisms, the transcriptome profile of the host cell upon CVA16 infection is still largely unknown. RESULTS: In this study, we compared the mRNA and miRNA expression profiles of human embryonic kidney 293T cells infected and non-infected with CVA16. We highlighted that the transcription of SCARB2, a cellular receptor for both CVA16 and EV71, was up-regulated by nearly 10-fold in infected cells compared to non-infected cells...
January 25, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28184287/of-the-phrensy-an-update-on-the-epidemiology-and-pathogenesis-of-bacterial-meningitis-in-the-pediatric-population
#13
REVIEW
Andrew Janowski, Jason Newland
In the past century, advances in antibiotics and vaccination have dramatically altered the incidence and clinical outcomes of bacterial meningitis. We review the shifting epidemiology of meningitis in children, including after the implementation of vaccines that target common meningitic pathogens and the introduction of intrapartum antibiotic prophylaxis offered to mothers colonized with Streptococcus agalactiae. We also discuss what is currently known about the pathogenesis of meningitis. Recent studies of the human microbiome have illustrated dynamic relationships of bacterial and viral populations with the host, which may potentiate the risk of bacterial meningitis...
2017: F1000Research
https://www.readbyqxmd.com/read/28179568/kinetics-subcellular-localization-and-contribution-to-parasite-virulence-of-a-trypanosoma-cruzi-hybrid-type-a-heme-peroxidase-tcapx-ccp
#14
Martín Hugo, Alejandra Martínez, Madia Trujillo, Damián Estrada, Mauricio Mastrogiovanni, Edlaine Linares, Ohara Augusto, Federico Issoglio, Ari Zeida, Darío A Estrín, Harry F G Heijnen, Lucía Piacenza, Rafael Radi
The Trypanosoma cruzi ascorbate peroxidase is, by sequence analysis, a hybrid type A member of class I heme peroxidases [TcAPx-cytochrome c peroxidase (CcP)], suggesting both ascorbate (Asc) and cytochrome c (Cc) peroxidase activity. Here, we show that the enzyme reacts fast with H2O2 (k = 2.9 × 10(7) M(-1)⋅s(-1)) and catalytically decomposes H2O2 using Cc as the reducing substrate with higher efficiency than Asc (kcat/Km = 2.1 × 10(5) versus 3.5 × 10(4) M(-1)⋅s(-1), respectively). Visible-absorption spectra of purified recombinant TcAPx-CcP after H2O2 reaction denote the formation of a compound I-like product, characteristic of the generation of a tryptophanyl radical-cation (Trp(233•+))...
February 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28179512/drought-and-immunity-determine-the-intensity-of-west-nile-virus-epidemics-and-climate-change-impacts
#15
Sara H Paull, Daniel E Horton, Moetasim Ashfaq, Deeksha Rastogi, Laura D Kramer, Noah S Diffenbaugh, A Marm Kilpatrick
The effect of global climate change on infectious disease remains hotly debated because multiple extrinsic and intrinsic drivers interact to influence transmission dynamics in nonlinear ways. The dominant drivers of widespread pathogens, like West Nile virus, can be challenging to identify due to regional variability in vector and host ecology, with past studies producing disparate findings. Here, we used analyses at national and state scales to examine a suite of climatic and intrinsic drivers of continental-scale West Nile virus epidemics, including an empirically derived mechanistic relationship between temperature and transmission potential that accounts for spatial variability in vectors...
February 8, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28176867/primary-macrophages-and-j774-cells-respond-differently-to-infection-with-mycobacterium-tuberculosis
#16
Nuria Andreu, Jody Phelan, Paola F de Sessions, Jacqueline M Cliff, Taane G Clark, Martin L Hibberd
Macrophages play an essential role in the early immune response to Mycobacterium tuberculosis and are the cell type preferentially infected in vivo. Primary macrophages and macrophage-like cell lines are commonly used as infection models, although the physiological relevance of cell lines, particularly for host-pathogen interaction studies, is debatable. Here we use high-throughput RNA-sequencing to analyse transcriptome dynamics of two macrophage models in response to M. tuberculosis infection. Specifically, we study the early response of bone marrow-derived mouse macrophages and cell line J774 to infection with live and γ-irradiated (killed) M...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28176452/overlooking-the-smallest-matter-viruses-impact-biological-invasions
#17
REVIEW
Cara A Faillace, Nicholas S Lorusso, Siobain Duffy
Parasites and pathogens have recently received considerable attention for their ability to affect biological invasions, however, researchers have largely overlooked the distinct role of viruses afforded by their unique ability to rapidly mutate and adapt to new hosts. With high mutation and genomic substitution rates, RNA and single-stranded DNA (ssDNA) viruses may be important constituents of invaded ecosystems, and could potentially behave quite differently from other pathogens. We review evidence suggesting that rapidly evolving viruses impact invasion dynamics in three key ways: (1) Rapidly evolving viruses may prevent exotic species from establishing self-sustaining populations...
February 8, 2017: Ecology Letters
https://www.readbyqxmd.com/read/28167251/neutrophils-exert-protection-in-early-aeromonas-veronii-infections-through-the-clearance-of-both-bacteria-and-dying-macrophages
#18
Jeffrey J Havixbeck, Aja M Rieger, Lucas J Churchill, Daniel R Barreda
Aeromonas veronii is a gram-negative opportunistic pathogen capable of infecting both fish and mammals. Left untreated, natural infection in fish can prove fatal and result in irreparable damage to the aquaculture industry. Neutrophils are essential innate effector cells that play critical roles in pathogen defense. Our aim was to investigate the immunological roles of teleost neutrophils during infection with A. veronii. We began by examining the functional defenses of neutrophils in vitro, where neutrophils efficiently killed the pathogen...
February 3, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28166814/closely-related-borrelia-burgdorferi-sensu-stricto-strains-exhibit-similar-fitness-in-single-infections-and-asymmetric-competition-in-multiple-infections
#19
Evelyn C Rynkiewicz, Julia Brown, Danielle M Tufts, Ching-I Huang, Helge Kampen, Stephen J Bent, Durland Fish, Maria A Diuk-Wasser
BACKGROUND: Wild hosts are commonly co-infected with complex, genetically diverse, pathogen communities. Competition is expected between genetically or ecologically similar pathogen strains which may influence patterns of coexistence. However, there is little data on how specific strains of these diverse pathogen species interact within the host and how this impacts pathogen persistence in nature. Ticks are the most common disease vector in temperate regions with Borrelia burgdorferi, the causative agent of Lyme disease, being the most common vector-borne pathogen in North America...
February 6, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28163258/proteomics-tracing-the-footsteps-of-infectious-disease
#20
Todd M Greco, Ileana M Cristea
Every year, a major cause of human disease and death worldwide is infection with the various pathogens - viruses, bacteria, fungi, and protozoa - that are intrinsic to our ecosystem. In efforts to control the prevalence of infectious disease and develop improved therapies, the scientific community has focused on building a molecular picture of pathogen infection and spread. These studies have been aimed at defining the cellular mechanisms that allow pathogen entry into hosts cells, their replication and transmission, as well as the core mechanisms of host defense against pathogens...
February 5, 2017: Molecular & Cellular Proteomics: MCP
keyword
keyword
82569
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"