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https://www.readbyqxmd.com/read/28928451/corrigendum-bcl6-sets-a-threshold-for-antiviral-signaling-by-restraining-irf7-transcriptional-program
#1
Feng Xu, Yanhua Kang, Ningtong Zhuang, Zhe Lu, Hang Zhang, Dakang Xu, Yina Ding, Hongping Yin, Liyun Shi
This corrects the article DOI: 10.1038/srep18778.
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928425/double-deficiency-of-trex2-and-dnase1l2-nucleases-leads-to-accumulation-of-dna-in-lingual-cornifying-keratinocytes-without-activating-inflammatory-responses
#2
Joan Manils, Heinz Fischer, Joan Climent, Eduard Casas, Celia García-Martínez, Jordi Bas, Supawadee Sukseree, Tanya Vavouri, Francisco Ciruela, Josep Maria de Anta, Erwin Tschachler, Leopold Eckhart, Concepció Soler
The cornification of keratinocytes on the surface of skin and oral epithelia is associated with the degradation of nuclear DNA. The endonuclease DNase1L2 and the exonuclease Trex2 are expressed specifically in cornifying keratinocytes. Deletion of DNase1L2 causes retention of nuclear DNA in the tongue epithelium but not in the skin. Here we report that lack of Trex2 results in the accumulation of DNA fragments in the cytoplasm of cornifying lingual keratinocytes and co-deletion of DNase1L2 and Trex2 causes massive accumulation of DNA fragments throughout the cornified layers of the tongue epithelium...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28912762/comparative-study-of-transcriptome-profiles-of-mouse-livers-and-skins-infected-by-fork-tailed-or-non-fork-tailed-schistosoma-japonicum
#3
Yan Yang, Jun-Jun He, Shuang Hu, Hua Chang, Xun Xiang, Jian-Fa Yang, Feng-Cai Zou
Schistosoma japonicum (S. japonicum) is a worldwide spread pathogen which penetrates host skin and then induces several diseases in infected host, such as fibrosis, formation of granulomas, hepatocirrhosis, and hepatomegaly. In present study, for the first time, transcriptomic profiles of mouse livers and skins infected by fork-tailed S. japonicum cercaria or non-fork-tailed S. japonicum cercaria were analyzed by using RNA-seq. The present findings demonstrated that transcriptomic landscapes of livers and skins infected by fork-tailed S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28900038/socs1-is-an-inducible-negative-regulator-of-ifn-lambda-induced-gene-expression-in-vivo
#4
Tanja Blumer, Mairene Coto-Llerena, Francois H T Duong, Markus H Heim
Type I (α and β) and type III (λ) interferons (IFNs) are induced upon viral infection through host sensory pathways that activate IFN regulatory factors (IRFs) and nuclear factor κB. Secreted IFNs induce autocrine and paracrine signalling through the JAK-Stat pathway leading to the transcriptional induction of hundreds of IFN stimulated genes (ISGs), amongst them sensory pathway components such as cGAS, STING, RIG-I, MDA5 and the transcription factor IRF7 that enhance the induction of IFNαs and IFNλss...
September 12, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28890396/mir-525-3p-mediates-antiviral-defense-to-rotavirus-infection-by-targeting-nonstructural-protein-1
#5
Zhiqiang Tian, Ji Zhang, Haiyang He, Jintao Li, Yuzhang Wu, Zigang Shen
MicroRNAs (miRNAs) are short RNAs of approximately 22 nucleotides that post-transcriptionally regulate gene expression by controlling mRNA stability or translation. They play critical roles in intricate networks of host-pathogen interactions and innate immunity. Rotaviruses (RVs) are the leading cause of severe diarrhea among infants and young children worldwide. This study was undertaken to demonstrate the importance of cellular miRNAs during RV (human Wa RV or Rhesus RV) strain infection. Twenty-nine differentially regulated miRNAs were identified during RV infection, and miR-525-3p was downregulated and validated by quantitative real-time polymerase chain reaction (qRT-PCR)...
September 7, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28890139/duck-interferon-regulatory-factor-1-acts-as-a-positive-regulator-in-duck-innate-antiviral-response
#6
Wei Qian, Xiaoqin Wei, Yongtao Li, Kelei Guo, Zhong Zou, Hongbo Zhou, Meilin Jin
In mammals, IFN regulatory factor (IRF) 1 can activates cellular genes and promotes viral resistance against some DNA and RNA viruses. Most IRFs have been identified as critical regulators in the IFN responses in both mammals and fish. In ducks, however, the functional role of IRF1 remains unknown. Here, we identified duck IRF1 (duIRF1) is essential to counteract viral invasion. duIRF1 is most abundant in duck spleen, and virus infection or poly(I:C) stimulation significantly induced duIRF1 expression in vivo and in vitro...
September 8, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28878077/irf9-prevents-cd8-t-cell-exhaustion-in-an-extrinsic-manner-during-acute-lcmv-infection
#7
Magdalena Huber, Tamara Suprunenko, Thomas Ashhurst, Felix Marbach, Hartmann Raifer, Svenja Wolff, Thomas Strecker, Barney Viengkhou, So Ri Jung, Hannah-Lena Obermann, Stefan Bauer, Haifeng C Xu, Philipp Lang, Adomati Tom, Karl S Lang, Nicholas J C King, Iain L Campbell, Markus J Hofer
Effective CD8(+) T cell responses play an important role in determining the course of a viral infection. Overwhelming antigen exposure can result in suboptimal CD8(+) T cell responses, leading to chronic infection. This altered CD8(+) T cell differentiation state, termed exhaustion, is characterized by reduced effector function, upregulation of inhibitory receptors and altered expression of transcription factors. Prevention of overwhelming antigen exposure which limits CD8(+) T cell exhaustion is of significant interest for controlling chronic infection...
September 6, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28871140/increased-incidence-of-cytomegalovirus-coinfection-in-hcv-infected-patients-with-late-liver-fibrosis-is-associated-with-dysregulation-of-jak-stat-pathway
#8
Marwa K Ibrahim, Ahmed Khedr, Noha G Bader El Din, Ahmed Khairy, Mostafa K El Awady
Herein, we examined the association between cytomegalovirus (CMV) coinfection and the progression of liver fibrosis in hepatitis C virus (HCV) infection, and investigated the effect of CMV coinfection on JAK-STAT pathway. CMV DNAemia was detected by PCR in DNA from controls (n = 120), and HCV patients with early (F0-F1, n = 131) and late (F2-F4, n = 179) liver fibrosis. By quantitative real time PCR (qRT-PCR), we examined the profile of 8 JAK-STAT transcripts in PBMCs RNA from 90 HCV patients (39 CMV positive and 51 CMV negative), 4 CMV mono-infected patients, and 15 controls...
September 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28857295/a-protective-role-of-irf3-and-irf7-signaling-downstream-tlrs-in-the-development-of-vein-graft-disease-via-type-i-interferons
#9
K H Simons, H A B Peters, J Wouter Jukema, M R de Vries, P H A Quax
BACKGROUND: Toll like receptors (TLR) play an important role in vein graft disease (VGD). Interferon regulatory factors (IRF) 3 and 7 are the transcriptional regulators of type-I interferons (IFN) and type-I IFN responsive genes and are downstream factors of TLRs. Relatively little is known with regard to the interplay of IRFs and TLRs in VGD development. The aim of this study was to investigate the role of IRF3 and IRF7 signaling downstream TLRs and the effect of IRF3 and IRF7 in VGD...
August 31, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28842371/molecular-cloning-and-functional-characterization-of-interferon-regulatory-factor-7-of-the-barbel-chub-squaliobarbus-curriculus
#10
Xin Zhao, Ronghua Wang, Yaoguo Li, Tiaoyi Xiao
The interferon regulatory factor 7 (IRF7) is a critical regulator of type-I interferon-dependent immune reaction that defense against virus. To investigate the antiviral function of IRF7 of barbel chub Squaliobarbus curriculus (ScIRF7), the cDNA of ScIRF7 was cloned and characterized. The full length cDNA of ScIRF7 was 1870 bp, consisted of 41 bp 5'-UTR, 560 bp 3'-UTR and a 1269 bp open reading frame (ORF). The ORF encoded 423 amino acids with a molecular weight of 49.426 KDa and a theoretical isoelectric point of 5...
August 24, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28831401/global-screening-of-antiviral-genes-that-suppress-baculovirus-transgene-expression-in-mammalian-cells
#11
Chia-Hung Wang, Nenavath Gopal Naik, Lin-Li Liao, Sung-Chan Wei, Yu-Chan Chao
Although baculovirus has been used as a safe and convenient gene delivery vector in mammalian cells, baculovirus-mediated transgene expression is less effective in various mammalian cell lines. Identification of the negative regulators in host cells is necessary to improve baculovirus-based expression systems. Here, we performed high-throughput shRNA library screening, targeting 176 antiviral innate immune genes, and identified 43 host restriction factor genes in a human A549 lung carcinoma cell line. Among them, suppression of receptor interaction protein kinase 1 (RIP1, also known as RIPK1) significantly increased baculoviral transgene expression without resulting in significant cell death...
September 15, 2017: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/28818792/regulation-of-type-i-interferon-responses-by-mitochondria-derived-reactive-oxygen-species-in-plasmacytoid-dendritic-cells
#12
Zsofia Agod, Tünde Fekete, Marietta M Budai, Aliz Varga, Attila Szabo, Hyelim Moon, Istvan Boldogh, Tamas Biro, Arpad Lanyi, Attila Bacsi, Kitti Pazmandi
Mitochondrial reactive oxygen species (mtROS) generated continuously under physiological conditions have recently emerged as critical players in the regulation of immune signaling pathways. In this study we have investigated the regulation of antiviral signaling by increased mtROS production in plasmacytoid dendritic cells (pDCs), which, as major producers of type I interferons (IFN), are the key coordinators of antiviral immunity. The early phase of type I IFN production in pDCs is mediated by endosomal Toll-like receptors (TLRs), whereas the late phase of IFN response can also be triggered by cytosolic retinoic acid-inducible gene-I (RIG-I), expression of which is induced upon TLR stimulation...
July 29, 2017: Redox Biology
https://www.readbyqxmd.com/read/28791126/investigation-of-sphingosine-kinase-1-in-interferon-responses-during-dengue-virus-infection
#13
Amanda L Aloia, Julie K Calvert, Jennifer N Clarke, Lorena T Davies, Karla J Helbig, Stuart M Pitson, Jillian M Carr
Dengue virus (DENV) regulates sphingosine kinase (SK)-1 activity and chemical inhibition of SK1 reduces DENV infection. In primary murine embryonic fibroblasts (pMEFs) lacking SK1 however, DENV infection is enhanced and this is associated with induction of normal levels of interferon beta (IFN-β) but reduced levels of IFN-stimulated genes (ISGs). We have further investigated this link between SK1 and type I IFN responses. DENV infection downregulates cell-surface IFN-alpha receptor (IFNAR)1 in both wild-type (WT) and SK1(-)(/-) pMEF, but, consistent with poor ISG responses, shows reduced induction of phosphorylated (p)-STAT1 and key IFN regulatory factors (IRF)1 and -7 in SK1(-/-) pMEF...
July 2017: Clinical & Translational Immunology
https://www.readbyqxmd.com/read/28768867/mechanism-of-interferon-stimulated-gene-induction-in-hiv-1-infected-macrophages
#14
Najla Nasr, Abdullateef A Alshehri, Thomas K Wright, Maryam Shahid, Bonnie M Heiner, Andrew N Harman, Rachel A Botting, Karla J Helbig, Michael R Beard, Kazuo Suzuki, Anthony D Kelleher, Paul Hertzog, Anthony L Cunningham
Viruses manipulate the complex interferon and interferon stimulated gene (ISG) system in different ways. We have previously shown that HIV inhibits type I and III interferons in its key target cells but directly stimulates a subset of >20 ISGs in macrophages and dendritic cells many of which are antiviral. Here we examined the mechanism of induction of ISGs and showed this occurred in two phases. The first phase was transient (0-24hpi) induced mainly by extracellular vesicles, and one of its component proteins HSP90α, contained within the HIV inoculum...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28768861/positive-and-negative-regulation-of-type-i-interferons-by-the-human-t-cell-leukemia-virus-antisense-protein-hbz
#15
Manraj Singh Narulla, Ahlam Alsairi, Lucie Charmier, Stephen Noonan, David Conroy, William W Hall, Noreen Sheehy
The pathogenesis of human T-cell leukemia virus type 1 (HTLV-1) is strongly linked to the viral regulatory proteins Tax1 and HBZ, whose opposing functions contribute to the clinical outcome of infection. Type I interferons α and β (IFNα and IFNβ) are key cytokines involved in innate immunity and IFNα, in combination with other antivirals, is extensively used in the treatment of HTLV-1 infection. The relationship between HTLV-1 and IFN signaling is unclear and to date the effect of HBZ on this pathway has not been examined...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28768858/human-metapneumovirus-m2-2-protein-acts-as-a-negative-regulator-of-alpha-interferon-production-by-plasmacytoid-dendritic-cells
#16
Yoshinori Kitagawa, Madoka Sakai, Mariko Funayama, Masae Itoh, Bin Gotoh
Human metapneumovirus (HMPV) has the ability to inhibit TLR7- and TLR9-dependent alpha interferon (IFN-α) production by plasmacytoid dendritic cells (pDCs). However the inhibition mechanism remains largely unknown. To identify viral proteins responsible for this inhibition, we performed a screening of HMPV open reading frames (ORFs) for their abilities to block TLR7/9-dependent signaling reconstituted in HEK293T cells by transfection with MyD88, TRAF6, IKKα, and IRF7. This screening demonstrated that the M2-2 protein was the most potent inhibitor of TLR7/9-dependent IFN-α induction...
August 2, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28747667/rna-sequencing-reveals-resistance-of-tlr4-ligand-activated-microglial-cells-to-inflammation-mediated-by-the-selective-jumonji-h3k27-demethylase-inhibitor
#17
Amitabh Das, Sarder Arifuzzaman, Taeho Yoon, Sun Hwa Kim, Jin Choul Chai, Young Seek Lee, Kyoung Hwa Jung, Young Gyu Chai
Persistent microglial activation is associated with the production and secretion of various pro-inflammatory genes, cytokines and chemokines, which may initiate or amplify neurodegenerative diseases. A novel synthetic histone 3 lysine 27 (H3K27) demethylase JMJD3 inhibitor, GSK-J4, was proven to exert immunosuppressive activities in macrophages. However, a genome-wide search for GSK-J4 molecular targets has not been undertaken in microglia. To study the immuno-modulatory effects of GSK-J4 at the transcriptomic level, triplicate RNA sequencing and quantitative real-time PCR analyses were performed with resting, GSK-J4-, LPS- and LPS + GSK-J4-challenged primary microglial (PM) and BV-2 microglial cells...
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28747508/mutations-in-the-e2-glycoprotein-and-the-3-untranslated-region-enhance-chikungunya-virus-virulence-in-mice
#18
David W Hawman, Kathryn S Carpentier, Julie M Fox, Nicholas A May, Wes Sanders, Stephanie A Montgomery, Nathaniel J Moorman, Michael S Diamond, Thomas E Morrison
Chikungunya virus (CHIKV) is a mosquito-transmitted alphavirus that causes debilitating musculoskeletal pain and inflammation and can persist for months to years after acute infection. Although studies in humans and experimentally-infected animals suggest that CHIKV infection persists in musculoskeletal tissues, the mechanisms for this remain poorly understood. To evaluate this further, we isolated CHIKV from the serum of persistently infected Rag1(-/-) mice at day 28. When inoculated into naïve WT mice, this persistently circulating CHIKV strain displayed a capacity for earlier dissemination and greater pathogenicity compared with the parental virus...
July 26, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28726298/faah-but-not-magl-inhibition-modulates-acute-tlr3-induced-neuroimmune-signaling-in-the-rat-independent-of-sex
#19
Lisa E Flannery, Rebecca J Henry, Daniel M Kerr, David P Finn, Michelle Roche
Toll-like receptor (TLR)3 is a key component of the innate immune response to viral infection. The present study firstly examined whether sex differences exist in TLR3-induced inflammatory, endocrine, and sickness responses. The data revealed that TLR3-induced expression of interferon- or NFkB-inducible genes (IFN-α/β, IP-10, or TNF-α), either peripherally (spleen) or centrally (hypothalamus), did not differ between male and female rats, with the exception of TLR3-induced IFN-α expression in the spleen of female, but not male, rats 8 hr post TLR3 activation...
July 20, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/28719617/microrna-155-deficiency-leads-to-decreased-autoantibody-levels-and-reduced-severity-of-nephritis-and-pneumonitis-in-pristane-induced-lupus
#20
Harald Leiss, Wilhelm Salzberger, Barbara Jacobs, Irina Gessl, Nicolas Kozakowski, Stephan Blüml, Antonia Puchner, Attila Kiss, Bruno K Podesser, Josef S Smolen, Georg H Stummvoll
OBJECTIVE: We herein examine the role of endogenous miR155 in the development of systemic manifestations in pristane induced lupus. MATERIALS AND METHODS: Systemic lupus in miR155-deficient and wild type mice was induced upon injection of pristane and analyzed after 8 months, PBS-injected mice served as controls. Glomerulonephritis and pneumonitis were quantified using the kidney biopsy score and a newly adapted histomorphometric image analysis system; lung tissue was further analyzed by tissue cytometry...
2017: PloS One
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