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https://www.readbyqxmd.com/read/28634691/modulation-of-rotavirus-severe-gastroenteritis-by-the-combination-of-probiotics-and-prebiotics
#1
REVIEW
Guadalupe Gonzalez-Ochoa, Lilian K Flores-Mendoza, Ramona Icedo-Garcia, Ricardo Gomez-Flores, Patricia Tamez-Guerra
Annual mortality rates due to infectious diarrhea are about 2.2 million; children are the most vulnerable age group to severe gastroenteritis, representing group A rotaviruses as the main cause of disease. One of the main factors of rotavirus pathogenesis is the NSP4 protein, which has been characterized as a viral toxin involved in triggering several cellular responses leading to diarrhea. Furthermore, the rotavirus protein NSP1 has been associated with interferon production inhibition by inducing the degradation of interferon regulatory factors IRF3, IRF5, and IRF7...
June 20, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28618271/lck-hck-fgr-mediated-tyrosine-phosphorylation-negatively-regulates-tbk1-to-restrain-innate-antiviral-responses
#2
Shengduo Liu, Shasha Chen, Xinran Li, Shiying Wu, Qian Zhang, Qiuheng Jin, Lin Hu, Ruyuan Zhou, Zhengyang Yu, Fansen Meng, Siwen Wang, Yaowei Huang, Sheng Ye, Li Shen, Zongping Xia, Jian Zou, Xin-Hua Feng, Pinglong Xu
Cytosolic nucleic acid sensing elicits interferon production for primary antiviral defense through cascades controlled by protein ubiquitination and Ser/Thr phosphorylation. Here we show that TBK1, a core kinase of antiviral pathways, is inhibited by tyrosine phosphorylation. The Src family kinases (SFKs) Lck, Hck, and Fgr directly phosphorylate TBK1 at Tyr354/394, to prevent TBK1 dimerization and activation. Accordingly, antiviral sensing and resistance were substantially enhanced in Lck/Hck/Fgr triple knockout cells and ectopic expression of Lck/Hck/Fgr dampened the antiviral defense in cells and zebrafish...
June 14, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28604814/functional-paralysis-of-gm-csf-derived-bone-marrow-cells-productively-infected-with-ectromelia-virus
#3
Lidia Szulc-Dąbrowska, Justyna Struzik, Agnieszka Ostrowska, Maciej Guzera, Felix N Toka, Magdalena Bossowska-Nowicka, Małgorzata M Gieryńska, Anna Winnicka, Zuzanna Nowak, Marek G Niemiałtowski
Ectromelia virus (ECTV) is an orthopoxvirus responsible for mousepox, a lethal disease of certain strains of mice that is similar to smallpox in humans, caused by variola virus (VARV). ECTV, similar to VARV, exhibits a narrow host range and has co-evolved with its natural host. Consequently, ECTV employs sophisticated and host-specific strategies to control the immune cells that are important for induction of antiviral immune response. In the present study we investigated the influence of ECTV infection on immune functions of murine GM-CSF-derived bone marrow cells (GM-BM), comprised of conventional dendritic cells (cDCs) and macrophages...
2017: PloS One
https://www.readbyqxmd.com/read/28603526/ftr83-a-member-of-the-large-fish-specific-fintrim-family-triggers-ifn-pathway-and-counters-viral-infection
#4
Christelle Langevin, Elina Aleksejeva, Armel Houel, Valérie Briolat, Corinne Torhy, Aurélie Lunazzi, Jean-Pierre Levraud, Pierre Boudinot
Tripartite motif (TRIM) proteins are involved in various cellular functions and constitute key factors of the antiviral innate immune response. TRIM proteins can bind viral particles directly, sending them to degradation by the proteasome, or ubiquitinate signaling molecules leading to upregulation of innate immunity. TRIM proteins are present in across metazoans but are particularly numerous in vertebrates where genes comprising a B30.2 domain have been often duplicated. In fish, a TRIM subset named finTRIM is highly diversified, with large gene numbers and clear signatures of positive selection in the B30...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28602740/protective-immunity-against-rock-bream-iridovirus-rbiv-infection-and-tlr3-mediated-type-i-interferon-signaling-pathway-in-rock-bream-oplegnathus-fasciatus-following-poly-i-c-administration
#5
Myung-Hwa Jung, Sung-Ju Jung
In this study, we evaluated the potential of poly (I:C) to induce antiviral status for protecting rock bream from RBIV infection. Rock bream injected with poly (I:C) at 2 days before infection (1.1 × 10(4)) at 20 °C had significantly higher protection with RPS 13.4% and 33.4% at 100 and 200 μg/fish, respectively, through 100 days post infection (dpi). The addition of boost immunization with poly (I:C) at before/post infection at 20 °C clearly enhanced the level of protection showing 33.4% and 60.0% at 100 and 200 μg/fish, respectively...
June 8, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28600291/sphingosine-1-phosphate-lyase-enhances-the-activation-of-ikk%C3%AE%C2%B5-to-promote-type-i-ifn-mediated-innate-immune-responses-to-influenza-a-virus-infection
#6
Madhuvanthi Vijayan, Chuan Xia, Yul Eum Song, Hanh Ngo, Caleb J Studstill, Kelly Drews, Todd E Fox, Marc C Johnson, John Hiscott, Mark Kester, Stephen Alexander, Bumsuk Hahm
Sphingosine 1-phosphate (S1P) lyase (SPL) is an intracellular enzyme that mediates the irreversible degradation of the bioactive lipid S1P. We have previously reported that overexpressed SPL displays anti-influenza viral activity; however, the underlying mechanism is incompletely understood. In this study, we demonstrate that SPL functions as a positive regulator of IKKε to propel type I IFN-mediated innate immune responses against viral infection. Exogenous SPL expression inhibited influenza A virus replication, which correlated with an increase in type I IFN production and IFN-stimulated gene accumulation upon infection...
June 9, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28595092/ebolavirus-protein-vp24-interferes-with-innate-immune-responses-by-inhibiting-interferon-%C3%AE-1-gene-expression
#7
Felix He, Krister Melén, Sari Maljanen, Rickard Lundberg, Miao Jiang, Pamela Österlund, Laura Kakkola, Ilkka Julkunen
Ebolaviruses (EBOV) cause severe disease with a recent outbreak in West Africa in 2014-2015 leading to more than 28 000 cases and 11 300 fatalities. This emphasizes the urgent need for better knowledge on these highly pathogenic RNA viruses. Host innate immune responses play a key role in restricting the spread of a viral disease. In this study we systematically analyzed the effects of cloned EBOV genes on the main host immune response to RNA viruses: the activation of RIG-I pathway and type I and III interferon (IFN) gene expression...
June 5, 2017: Virology
https://www.readbyqxmd.com/read/28591144/err%C3%AE-negatively-regulates-type-i-interferon-induction-by-inhibiting-tbk1-irf3-interaction
#8
Xiang He, Shengli Ma, Yinyin Tian, Congwen Wei, Yongjie Zhu, Feng Li, Pingping Zhang, Penghao Wang, Yanhong Zhang, Hui Zhong
Estrogen-related receptor α (ERRα) is a member of the nuclear receptor superfamily controlling energy homeostasis; however, its precise role in regulating antiviral innate immunity remains to be clarified. Here, we showed that ERRα deficiency conferred resistance to viral infection both in vivo and in vitro. Mechanistically, ERRα inhibited the production of type-I interferon (IFN-I) and the expression of multiple interferon-stimulated genes (ISGs). Furthermore, we found that viral infection induced TBK1-dependent ERRα stabilization, which in turn associated with TBK1 and IRF3 to impede the formation of TBK1-IRF3, IRF3 phosphorylation, IRF3 dimerization, and the DNA binding affinity of IRF3...
June 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28589097/ago2-negatively-regulates-type-i-interferon-signaling-pathway-by-competition-binding-irf3-with-cbp-p300
#9
Shengyu Wang, Xin Sun, Chenyang Yi, Dan Zhang, Xian Lin, Xiaomei Sun, Huanchun Chen, Meilin Jin
Viral infection triggers a series of signaling cascades and host innate immune responses, including interferon (IFN) production, which depends on coordinated activity of multiple transcription factors. IFN regulatory factor 3 (IRF3) and transcriptional coactivator CREB binding protein (CBP) and/or p300 are core factors that participate in transcriptional complex formation in the nucleus. In general, cells balance the production of IFNs through suppressive and stimulative mechanisms, but viral infections can disrupt such equilibrium...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28581456/epigenetic-silencing-of-irf1-dysregulates-type-iii-interferon-responses-to-respiratory-virus-infection-in-epithelial-to-mesenchymal-transition
#10
Jun Yang, Bing Tian, Hong Sun, Roberto P Garofalo, Allan R Brasier
Chronic oxidative injury produced by airway disease triggers a transforming growth factor-β (TGF-β)-mediated epigenetic reprogramming known as the epithelial-mesenchymal transition (EMT). We observe that EMT silences protective mucosal interferon (IFN)-I and III production associated with enhanced rhinovirus (RV) and respiratory syncytial virus (RSV) replication. Mesenchymal transitioned cells are defective in inducible interferon regulatory factor 1 (IRF1) expression by occluding RelA and IRF3 access to the promoter...
June 5, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28566766/identification-of-a-small-molecule-that-primes-the-type-i-interferon-response-to-cytosolic-dna
#11
Samira Khiar, Marianne Lucas-Hourani, Sébastien Nisole, Nikaïa Smith, Olivier Helynck, Maryline Bourgine, Claude Ruffié, Jean-Philippe Herbeuval, Hélène Munier-Lehmann, Frédéric Tangy, Pierre-Olivier Vidalain
The type I interferon response plays a pivotal role in host defense against infectious agents and tumors, and promising therapeutic approaches rely on small molecules designed to boost this system. To identify such compounds, we developed a high-throughput screening assay based on HEK-293 cells expressing luciferase under the control of Interferon-Stimulated Response Elements (ISRE). An original library of 10,000 synthetic compounds was screened, and we identified a series of 1H-benzimidazole-4-carboxamide compounds inducing the ISRE promoter sequence, specific cellular Interferon-Stimulated Genes (ISGs), and the phosphorylation of Interferon Regulatory Factor (IRF) 3...
May 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28553017/capsular-polysaccharide-is-a-main-component-of-mycoplasma-ovipneumoniae-in-the-pathogen-induced-toll-like-receptor-mediated-inflammatory-responses-in-sheep-airway-epithelial-cells
#12
Zhongjia Jiang, Fuyang Song, Yanan Li, Di Xue, Guangcun Deng, Min Li, Xiaoming Liu, Yujiong Wang
Mycoplasma ovipneumoniae (M. ovipneumoniae) is characterized as an etiological agent of primary atypical pneumonia that specifically infects sheep and goat. In an attempt to better understand the pathogen-host interaction between the invading M. ovipneumoniae and airway epithelial cells, we investigated the host inflammatory responses against capsular polysaccharide (designated as CPS) of M. ovipneumoniae using sheep bronchial epithelial cells cultured in an air-liquid interface (ALI) model. Results showed that CPS derived from M...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28534493/usp13-negatively-regulates-antiviral-responses-by-deubiquitinating-sting
#13
He Sun, Qiang Zhang, Ying-Ying Jing, Man Zhang, Hai-Ying Wang, Zeng Cai, Tianzi Liuyu, Zhi-Dong Zhang, Tian-Chen Xiong, Yan Wu, Qi-Yun Zhu, Jing Yao, Hong-Bing Shu, Dandan Lin, Bo Zhong
STING (also known as MITA) is critical for host defence against viruses and the activity of STING is regulated by ubiquitination. However, the deubiquitination of STING is not fully understood. Here, we show that ubiquitin-specific protease 13 (USP13) is a STING-interacting protein that catalyses deubiquitination of STING. Knockdown or knockout of USP13 potentiates activation of IRF3 and NF-κB and expression of downstream genes after HSV-1 infection or transfection of DNA ligands. USP13 deficiency results in impaired replication of HSV-1...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28501626/a-method-for-the-detection-of-virus-infectivity-in-single-cells-and-real-time-towards-an-automated-fluorescence-neutralization-test
#14
Marylene Maistriau, Tea Carletti, Mohammad Khalid Zakaria, Luca Braga, Valentina Faoro, Vasileios Vasileiadis, Alessandro Marcello
Virus neutralizing antibodies are critical correlates of protection in vaccine development and are discriminatory in the plaque reduction neutralization test when used for the diagnosis of viral infections. However, neutralization assays are time consuming, labor intensive and highly variable, thus limiting their use. Advances in automated live imaging of cells opened new possibilities for standard virus diagnostic techniques such as neutralization assays. To this end, a reporter cell line based on the translocation of the transcription factor IRF3 in response to infection is proposed...
May 10, 2017: Virus Research
https://www.readbyqxmd.com/read/28493975/molecular-characterization-expression-of-chicken-tbk1-gene-and-its-effect-on-irf3-signaling-pathway
#15
Yan Wang, Yue Yin, Xi Lan, Fei Ye, Kai Tian, Xiaoling Zhao, Huadong Yin, Diyan Li, Hengyong Xu, Yiping Liu, Qing Zhu
TRAF family member-associated NF-κB activator (TANK)-binding kinase1 (TBK1) is a serine-threonine kinase at the crossroads of multiple interferon (IFN)-inducing signaling pathways in innate immunity. The importance of TBK1 in antiviral immunity is well established in mammal models, but in chicken, the molecular characterization and potential function of TBK1 remain unclear. In the present study, the open-reading frame (ORF) of chicken TBK1 (chTBK1) was cloned and characterized. The sequencing results revealed that the chTBK1 ORF consists of 2190 base pairs (bp) encoding a deduced protein of 729 amino acid residues...
2017: PloS One
https://www.readbyqxmd.com/read/28489052/crude-ecklonia-cava-flake-extracts-attenuate-inflammation-through-the-regulation-of-tlr4-signaling-pathway-in-lps-induced-raw264-7-cells
#16
Ji-Hyun Hwang, Kui-Jin Kim, Boo-Yong Lee
We investigated the beneficial effects of the crude Ecklonia cava flake (CEF), which is a residual product after polyphenol extraction from Ecklonia cava, on inflammation in LPS-stimulated RAW264.7 cells. A group of five different CEF extracts was obtained by a preparation process using water, hydrochloric acid or temperature. We observed that large-size (>19 kDa) CEF extract, which was extracted with water at 95 °C (CEF-W, 95 °C), suppressed the production of inflammatory cytokines by inhibiting its mRNA expression in LPS-induced RAW264...
May 10, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28487378/encephalomyocarditis-virus-3c-protease-attenuates-type-i-interferon-production-through-disrupting-the-tank-tbk1-ikk%C3%AE%C2%B5-irf3-complex
#17
Li Huang, Tao Xiong, Huibin Yu, Quan Zhang, Kunli Zhang, Changyao Li, Liang Hu, Yuanfeng Zhang, Lijie Zhang, Qinfang Liu, Shengnan Wang, Xijun He, Zhigao Bu, Xuehui Cai, Shangjin Cui, Jiangnan Li, Changjiang Weng
TRAF family member-associated NF-κB activator (TANK) is a scaffold protein that assembles into the interferon (IFN) regulator factor 3 (IRF3)-phosphorylating TANK-binding kinase 1 (TBK1)-(IκB) kinase ε (IKKε) complex, where it is involved in regulating phosphorylation of the IRF3 and IFN production. However, the functions of TANK in encephalomyocarditis virus (EMCV) infection-induced type I IFN production are not fully understood. Here, we demonstrated that, instead of stimulating type I IFN production, the EMCV-HB10 strain infection potently inhibited Sendai virus- and polyI:C-induced IRF3 phosphorylation and type I IFN production in HEK293T cells...
June 9, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28486191/nlrp4-is-an-essential-negative-regulator-of-fructose-induced-cardiac-injury-in-vitro-and-in-vivo
#18
Yong-Gang Lian, Hai-Ying Zhao, Sheng-Ji Wang, Qin-Liang Xu, Xiang-Jun Xia
High fructose consumption leads to metabolic syndrome and enhances cardiovascular disease risk. However, our knowledge of the molecular mechanism underlying the cardiac disease caused by fructose feeding is still poor. Nod-like receptors (NLRs) are intracellular sensors, responding to a variety of intracellular danger signals to induce injuries. NLRP4 is a negative regulator of nuclear factor-κB (NF-κB) signaling pathway through interactions with kinase IκB kinase (IKK). Here, we illustrated that NLRP4 attenuates pro-inflammatory cytokines releasing, including Transforming growth factor (TGF-β1), Tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), interleukin-18 (IL-18) and interleukin-6 (IL-6), in fructose-treated cardiac cells by means of RT-qPCR, and western blotting analysis...
July 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28485788/l6h21-prolonged-rats-survival-after-limb-allotransplantation-by-inhibiting-acute-rejection
#19
F-Z Yu, X Wen, W-L Ding, J-Y Zhu, S-H Du, Q-F Shen, X Ni, J Wang
OBJECTIVE: Preventing and reducing allograft rejection play a far more important role in limb allotransplantation. We previously found L6H21 could inhibit LPS-induced (lipopolysaccharide LPS) overexpression inflammatory factors in macrophages and specifically targets to MD-2 (myeloid differential protein-2 MD-2) required for TLR4 (Toll-like receptor 4 TLR4) activation and represented an important therapeutic target in inflammatory disorders. Therefore, we evaluated the effect and explored the mechanism of L6H21 in rats' limb allograft model...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28484079/intrinsic-antiproliferative-activity-of-the-innate-sensor-sting-in-t-lymphocytes
#20
Silvia Cerboni, Nadia Jeremiah, Matteo Gentili, Ulf Gehrmann, Cécile Conrad, Marie-Claude Stolzenberg, Capucine Picard, Bénédicte Neven, Alain Fischer, Sébastian Amigorena, Frédéric Rieux-Laucat, Nicolas Manel
Activation of the cyclic dinucleotide sensor stimulator of interferon (IFN) genes (STING) is critical for IFN and inflammatory gene expression during innate immune responses. However, the role of STING in adaptive immunity is still unknown. In this study, we show that STING activation reduces the proliferation of T lymphocytes. This activity was independent of TBK1 and IRF3 recruitment and of type I IFN but required a distinct C-terminal domain of STING that activates NF-κB. Inhibition of cell proliferation by STING required its relocalization to the Golgi apparatus and caused mitotic errors...
June 5, 2017: Journal of Experimental Medicine
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