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https://www.readbyqxmd.com/read/28630139/functional-interfaces-between-ticam-2-tram-and-ticam-1-trif-in-tlr4-signaling
#1
REVIEW
Kenji Funami, Misako Matsumoto, Hiroyuki Oshiumi, Fuyuhiko Inagaki, Tsukasa Seya
Toll-like receptor 4 (TLR4) recognizes lipopolysaccharide (LPS), produces pro-inflammatory cytokines and type I interferons, and associates with a trigger of endotoxin shock. TLR4 is interacted with a TIR domain-containing adaptor molecule-2 (TICAM-2)/TRAM [TRIF (TIR domain-containing adaptor-inducing interferon-β)-related adaptor molecule] via its Toll-interleukin-1 receptor homology (TIR) domain. TICAM-2 acts as a scaffold protein and activates TIR domain-containing adaptor molecule-1 (TICAM-1)/TRIF. According to the structural analysis by NMR, TICAM-2 interacts with TICAM-1 by the acidic amino acids motif, E87/D88/D89...
June 19, 2017: Biochemical Society Transactions
https://www.readbyqxmd.com/read/28623125/chronic-intermittent-hypoxia-induces-liver-fibrosis-in-mice-with-diet-induced-obesity-via-tlr4-myd88-mapk-nf-kb-signaling-pathways
#2
Hyeon Hui Kang, In Kyoung Kim, Hye In Lee, Hyonsoo Joo, Jeong Uk Lim, Jongmin Lee, Sang Haak Lee, Hwa Sik Moon
Obstructive sleep apnea (OSA) is associated with nonalcoholic fatty liver disease (NAFLD), and causes chronic intermittent hypoxia (CIH) during sleep. Inflammation is associated with the development of metabolic complications induced by CIH. Research suggests that innate immune mechanisms are involved in the pro-inflammatory pathways of liver fibrosis. The purpose of this study was to investigate whether innate immune responses induce liver fibrosis, and to evaluate mechanisms underlying hepatic inflammation related to CIH in a murine diet-induced obesity (DIO) model...
June 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28618273/sting-requires-the-adaptor-trif-to-trigger-innate-immune-responses-to-microbial-infection
#3
Xin Wang, Tanmay Majumdar, Patricia Kessler, Evgeny Ozhegov, Ying Zhang, Saurabh Chattopadhyay, Sailen Barik, Ganes C Sen
No abstract text is available yet for this article.
June 14, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28616865/isoacteoside-a-dihydroxyphenylethyl-glycoside-exhibits-anti-inflammatory-effects-through-blocking-tlr4-dimerization
#4
Hongwei Gao, Yankun Cui, Naixin Kang, Xin Liu, Yanli Liu, Yue Zou, Ziyu Zhang, Xiaoran Li, Shilin Yang, Ji Li, Chunming Wang, Qiong-Ming Xu, Xiuping Chen
BACKGROUND AND PURPOSE: Isoacteoside (ISO) is a phenylethanoid isolated from Monochasma savatieri Franch. ex Maxim., which is an anti-inflammatory herb widely used in traditional Chinese medicine. However, the exact mechanism of the anti-inflammatory activity of ISO is not completely understood. In this study, its anti-inflammatory mechanism in mouse macrophages was elucidated. EXPERIMENTAL APPROACH: The expression of the NF-κB pathway, MAPK pathway, iNOS, TNF-α, IL-6 and IL-1β was evaluated using western blotting, qRT-PCR or ELISA...
June 14, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28612840/toll-like-receptor-3-in-nasal-cd103-dendritic-cells-is-involved-in-immunoglobulin-a-production
#5
H Takaki, S Kure, H Oshiumi, Y Sakoda, T Suzuki, A Ainai, H Hasegawa, M Matsumoto, T Seya
Intranasal inoculation with influenza hemagglutinin subunit with polyinosine-polycytidylic (polyI:C), a synthetic analog for double-stranded RNA, enhances production of vaccine-specific immunoglobulin (Ig) A, which is superior to IgG in prophylactic immunity. The mechanism whereby polyI:C skews to IgA production in the nasal-associated lymph tissue (NALT) was investigated in mouse models. Nasally instilled polyI:C was endocytosed into CD103(+) dendritic cells (DCs) and induced T-cell activation, including interferon (IFN)-γ production...
June 14, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28593434/pam2csk4-and-pam3csk4-induce-inos-expression-via-tbk1-and-myd88-molecules-in-mouse-macrophage-cell-line-raw264-7
#6
Panthong Kulsantiwong, Matsayapan Pudla, Chanya Srisaowakarn, Jitrada Boondit, Pongsak Utaisincharoen
OBJECTIVE: The aim of this study was to investigate the involvement of TLR adaptor molecules, such as TRIF, MyD88, and TBK1 in the induction of iNOS and nitric oxide (NO) production in Pam2CSK4 and Pam3CSK4-treated mouse macrophages. METHOD: Mouse macrophage cell line (RAW264.7) was transfected with trif, myd88, and tbk1 siRNAs before stimulated with Pam2CSK4 and Pam3CSK4. The iNOS gene and protein expression were determined by RT-PCR and immunoblotting, respectively...
June 7, 2017: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/28573049/biphalin-a-dimeric-enkephalin-alleviates-lps-induced-activation-in-rat-primary-microglial-cultures-in-opioid-receptor-dependent-and-receptor-independent-manners
#7
Katarzyna Popiolek-Barczyk, Anna Piotrowska, Wioletta Makuch, Joanna Mika
Neuropathic pain is relatively less responsive to opioids than other types of pain, which is possibly due to a disrupted opioid system partially caused by the profound microglial cell activation that underlines neuroinflammation. We demonstrated that intrathecally injected biphalin, a dimeric enkephalin analog, diminished symptoms of neuropathy in a preclinical model of neuropathic pain in rats (CCI, chronic constriction injury of the sciatic nerve) at day 12 postinjury. Using primary microglial cell cultures, we revealed that biphalin did not influence cell viability but diminished NO production and expression of Iba1 in LPS-stimulated cells...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28571545/potential-medications-or-compounds-acting-on-toll-like-receptors-in-cerebral-ischemia
#8
Man Li, Jing Liu, Ying Bi, Jixiang Chen, Lei Zhao
Toll-like receptors have been suggested to play an integral role in the process of inflammatory response after ischemic injury. Of all 9 TLRs presenting in brain, functions of TLR2, TLR3, TLR4, TLR7, TLR8 and TLR9 have been studied in recent years. The MyD88 pathway and TIR domain-containing adaptor inducing interferon pathway are involved in these pathophysiological changes. Since the important role, the therapeutic potential of strategies acting on TLRs should be evaluated. Feasible approaches may function in the following respects, methods acting on TLRs directly, modulations of MyD88 or TRIF signaling pathway, and the ischemic tolerance induced by the preconditioning or postconditioning with TLR ligands or minor cerebral ischemia...
June 1, 2017: Current Neuropharmacology
https://www.readbyqxmd.com/read/28566380/seneca-valley-virus-suppresses-host-type-i-interferon-production-by-targeting-adaptor-proteins-mavs-trif-and-tank-for-cleavage
#9
Suhong Qian, Wenchun Fan, Tingting Liu, Mengge Wu, Huawei Zhang, Xiaofang Cui, Yun Zhou, Junjie Hu, Shaozhong Wei, Huanchun Chen, Xiangmin Li, Ping Qian
Seneca Valley Virus (SVV) is an oncolytic RNA virus belonging to the Picornaviridae family. Its nucleotide sequence is highly similar to those of members of the Cardiovirus genus. SVV is also a neuroendocrine cancer-selective oncolytic picornavirus that can be used for anti-cancer therapy. However, the interaction between SVV and its host is yet to be fully characterized. In this study, SVV inhibited antiviral type I interferon (IFN) responses by targeting different host adaptors, including mitochondrial anti-viral signaling (MAVS), Toll/IL-1 receptor domain-containing adaptor inducing IFN-beta (TRIF), and TRAF family member-associated NF-κB activator (TANK) via viral 3C(pro) SVV 3C(pro) mediated the cleavage of MAVS, TRIF, and TANK at specific sites, which required its protease activity...
May 31, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28562479/sepsis-up-regulates-cd14-expression-in-a-myd88-dependent-and-trif-independent-pathway
#10
Zhixia Chen, Zhenzhen Shao, Shuya Mei, Zhengzheng Yan, Xibing Ding, Timothy Billiar, Quan Li
An overwhelming immune response, particularly from macrophages, plays a critical role in survival and organ damage in sepsis patients. TLRs are important receptors to recognize the conserved motifs expressed by invading bacteria. The TLRs except TLR3 signal via a MyD88 dependent pathway. TLR3 uses a TRIF dependent pathway, while TLR4 uses both MyD88 and TRIF dependent pathways. Previous studies indicated that CD14 was necessary for TLRs dependent production of pro-inflammatory cytokines. Blocking CD14 protected against the deleterious systemic inflammatory response associated with sepsis...
May 29, 2017: Shock
https://www.readbyqxmd.com/read/28504091/toll-like-receptor-4-an-important-molecule-in-recognition-and-induction-of-appropriate-immune-responses-against-chlamydia-infection
#11
REVIEW
Reza Nosratababadi, Vahid Bagheri, Mohammad Zare-Bidaki, Hamid Hakimi, Nahid Zainodini, Mohammad Kazemi Arababadi
Chlamydia species are obligate intracellular pathogens causing different infectious diseases particularly asymptomatic genital infections and are also responsible for a wide range of complications. Previous studies showed that there are different immune responses to Chlamydia species and their infections are limited to some cases. Moreover, Chlamydia species are able to alter immune responses through modulating the expression of some immune system related molecules including cytokines. Toll like receptors (TLRs) belonge to pathogen recognition receptors (PRRs) and play vital roles in recognition of microbes and stimulation of appropriate immune responses...
April 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/28502093/the-tlr4-trif-pathway-can-protect-against-the-development-of-experimental-allergic-asthma
#12
Karim H Shalaby, Saba Al-Heialy, Kimitake Tsuchiya, Soroor Farahnak, Toby K McGovern, Paul-Andre Risse, Woong-Kyung Suh, Salman T Qureshi, James G Martin
The Toll-like Receptor (TLR) adaptor proteins Myeloid Differentiating Factor 88 (MyD88) and Toll, interleukin-1 Receptor and Resistance protein (TIR) domain-containing adaptor inducing interferon-β (TRIF) comprise the two principal limbs of the TLR signaling network. We studied the role of these adaptors in the TLR4-dependent inhibition of allergic airway disease and induction of CD4+ICOS+ T cells by nasal application of Protollin(™) , a mucosal adjuvant composed of TLR2 and 4 agonists. Wild-type (wt), Trif -/- or Myd88 -/- mice were sensitized to birch pollen extract (BPEx), then received intranasal Protollin followed by consecutive BPEx challenges...
May 14, 2017: Immunology
https://www.readbyqxmd.com/read/28498367/initiation-and-execution-mechanisms-of-necroptosis-an-overview
#13
REVIEW
Sasker Grootjans, Tom Vanden Berghe, Peter Vandenabeele
Necroptosis is a form of regulated cell death, which is induced by ligand binding to TNF family death domain receptors, pattern recognizing receptors and virus sensors. The common feature of these receptor systems is the implication of proteins, which contain a receptor interaction protein kinase (RIPK) homology interaction motif (RHIM) mediating recruitment and activation of receptor-interacting protein kinase 3 (RIPK3), which ultimately activates the necroptosis executioner mixed lineage kinase domain-like (MLKL)...
May 12, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28480979/down-regulation-of-trif-tlr3-and-mavs-in-hcv-infected-liver-correlates-with-the-outcome-of-infection
#14
Premashis Kar, Deepak Kumar, Phani Kumar Gumma, Soumya Jyoti Chowdhury, Vijay Kumar Karra
AIMS: In virus-infected cells, pattern recognition receptors (PRRs) recruits their specific adaptor molecules, mitochondrial antiviral signaling protein (MAVS), TIR-domain-containing adapter-inducing interferon-β (TRIF) and TNF receptor associated factor (TRAF6) which induces interferon. Toll-like receptor 3 (TLR3) induces activation of the NF-kappa B (NF-κB) for interferon production. The study has been designed to assess the correlation of TLR3, MAVS, TRIF and TRAF6 outcome of HCV infection...
May 8, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28480962/human-papillomavirus-type-16-e6-oncoprotein-promotes-proliferation-and-invasion-of-non-small-cell-lung-cancer-cells-through-toll-like-receptor-3-signaling-pathway
#15
Xia Wang, Zhiqiang Zhang, Huimin Cao, Wenyi Niu, Mingying Li, Xiu'e Xi, Jing Wang
Human papillomavirus (HPV) oncoproteins play vital roles in non-small cell lung cancer (NSCLC) pathogenesis, and Toll-like receptors (TLRs) contribute to tumor progression. However, interaction between HPV oncoproteins and TLR signaling in NSCLC progression remains unclear. Thus, the aim of the study was to explore effects of HPV16 E6 oncoprotein-induced TLRs pathway on growth and invasion of NSCLC cells and to examine potential mechanisms being involved. Recombinant plasmid (pcDNA-HPV16 E6) expressing HPV16 E6 protein was constructed...
May 8, 2017: Journal of Medical Virology
https://www.readbyqxmd.com/read/28479387/the-effects-of-tlr3-trif-and-traf3-snps-and-interactions-with-environmental-factors-on-type-2-diabetes-mellitus-and-vascular-complications-in-a-han-chinese-population
#16
Zixing Zhou, Chengli Zeng, Lihong Nie, Shiqi Huang, Congcong Guo, Di Xiao, Yajing Han, Xiaohong Ye, Meiling Ou, Chuican Huang, Xingguang Ye, Zihao Wen, Guang Yang, Chunxia Jing
Toll-like receptor 3 (TLR3) is involved in type I interferon-β (IFN-β) via TIR-domain-containing adapter-inducing interferon-β (TRIF) and Tumor necrosis factor receptor-associated factor 3 (TRAF3), culminating in inflammation and immunity reactions. TLR3 is implicated in insulin resistance and type 2 diabetes mellitus (T2DM). Eight SNPs of these genes were detected in 552 T2DM patients and 552 matched healthy control subjects. Gene-gene and gene-environment interactions and haplotype associations were also evaluated...
May 4, 2017: Gene
https://www.readbyqxmd.com/read/28473813/asunaprevir-evokes-hepatocytes-innate-immunity-to-restrict-the-replication-of-hepatitis-c-and-dengue-virus
#17
Wei-Lun Tsai, Jin-Shiung Cheng, Chih-Wen Shu, Kwok-Hung Lai, Hoi-Hung Chan, Chun-Ching Wu, Jing-Mei Wu, Ping-I Hsu, Raymond T Chung, Tsung-Hsien Chang
Type I Interferon-mediated innate immunity against Flaviviridae, such as Hepatitis C virus (HCV) and Dengue virus (DENV), involves TLR3, RIG-I-like receptor (RLR) and JAK-STAT signal pathways. Asunaprevir is a newly developed HCV protease inhibitor for HCV treatment. Whether, asunaprevir activates innate immunity to restrict viral infection is unclear. Thus, this study investigates the effect of asunaprevir on innate immunity and its influence on HCV and DENV infection. Huh 7.5.1, Hep-G2 cells, JFH-1 infection model, and DENV-2 infection were used for the analysis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28471051/a-presumed-antagonistic-lps-identifies-distinct-functional-organization-of-tlr4-in-mouse-microglia
#18
Christin Döring, Tommy Regen, Ulla Gertig, Denise van Rossum, Anne Winkler, Nasrin Saiepour, Wolfgang Brück, Uwe-Karsten Hanisch, Hana Janova
Microglia as principle innate immune cells of the central nervous system (CNS) are the first line of defense against invading pathogens. They are capable of sensing infections through diverse receptors, such as Toll-like receptor 4 (TLR4). This receptor is best known for its ability to recognize bacterial lipopolysaccharide (LPS), a causative agent of gram-negative sepsis and septic shock. A putative, naturally occurring antagonist of TLR4 derives from the photosynthetic bacterium Rhodobacter sphaeroides. However, the antagonistic potential of R...
May 4, 2017: Glia
https://www.readbyqxmd.com/read/28469251/lipopolysaccharide-induced-nf-%C3%AE%C2%BAb-nuclear-translocation-is-primarily-dependent-on-myd88-but-tnf%C3%AE-expression-requires-trif-and-myd88
#19
Jiro Sakai, Eugenia Cammarota, John A Wright, Pietro Cicuta, Rachel A Gottschalk, Ning Li, Iain D C Fraser, Clare E Bryant
TLR4 signalling through the MyD88 and TRIF-dependent pathways initiates translocation of the transcription factor NF-κB into the nucleus. In cell population studies using mathematical modeling and functional analyses, Cheng et al. suggested that LPS-driven activation of MyD88, in the absence of TRIF, impairs NF-κB translocation. We tested the model proposed by Cheng et al. using real-time single cell analysis in macrophages expressing EGFP-tagged p65 and a TNFα promoter-driven mCherry. Following LPS stimulation, cells lacking TRIF show a pattern of NF-κB dynamics that is unaltered from wild-type cells, but activation of the TNFα promoter is impaired...
May 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28465426/a-novel-agonist-of-the-trif-pathway-induces-a-cellular-state-refractory-to-replication-of-zika-chikungunya-and-dengue-viruses
#20
Kara M Pryke, Jinu Abraham, Tina M Sali, Bryan J Gall, Iris Archer, Andrew Liu, Shelly Bambina, Jason Baird, Michael Gough, Marita Chakhtoura, Elias K Haddad, Ilsa T Kirby, Aaron Nilsen, Daniel N Streblow, Alec J Hirsch, Jessica L Smith, Victor R DeFilippis
The ongoing concurrent outbreaks of Zika, Chikungunya, and dengue viruses in Latin America and the Caribbean highlight the need for development of broad-spectrum antiviral treatments. The type I interferon (IFN) system has evolved in vertebrates to generate tissue responses that actively block replication of multiple known and potentially zoonotic viruses. As such, its control and activation through pharmacological agents may represent a novel therapeutic strategy for simultaneously impairing growth of multiple virus types and rendering host populations resistant to virus spread...
May 2, 2017: MBio
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