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MyD88 in T cells

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https://www.readbyqxmd.com/read/28418004/host-determinants-of-expression-of-the-helicobacter-pylori-baba-adhesin
#1
Mary E Kable, Lori M Hansen, Cathy M Styer, Samuel L Deck, Olena Rakhimova, Anna Shevtsova, Kathryn A Eaton, Miriam E Martin, Pär Gideonsson, Thomas Borén, Jay V Solnick
Expression of the Helicobacter pylori blood group antigen binding adhesin A (BabA) is more common in strains isolated from patients with peptic ulcer disease or gastric cancer, rather than asymptomatic colonization. Here we used mouse models to examine host determinants that affect H. pylori BabA expression. BabA expression was lost by phase variation as frequently in WT mice as in RAG2-/- mice that do not have functional B or T cells, and in MyD88-/-, TLR2-/- and TLR4-/- mice that are defective in toll like receptor signaling...
April 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28405493/hla-class-i-restricted-myd88-l265p-derived-peptides-as-specific-targets-for-lymphoma-immunotherapy
#2
Annika Nelde, Juliane Sarah Walz, Daniel Johannes Kowalewski, Heiko Schuster, Olaf-Oliver Wolz, Janet Kerstin Peper, Yamel Cardona Gloria, Anton W Langerak, Alice F Muggen, Rainer Claus, Irina Bonzheim, Falko Fend, Helmut Rainer Salih, Lothar Kanz, Hans-Georg Rammensee, Stefan Stevanović, Alexander N R Weber
Genome sequencing has uncovered an array of recurring somatic mutations in different non-Hodgkin lymphoma (NHL) subtypes. If affecting protein-coding regions, such mutations may yield mutation-derived peptides that may be presented by HLA class I proteins and recognized by cytotoxic T cells. A recurring somatic and oncogenic driver mutation of the Toll-like receptor adaptor protein MYD88, Leu265Pro (L265P) was identified in up to 90% of different NHL subtype patients. We therefore screened the potential of MYD88(L265P)-derived peptides to elicit cytotoxic T cell responses as tumor-specific neoantigens...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28404732/roles-of-the-traf6-and-pellino-e3-ligases-in-myd88-and-rankl-signaling
#3
Sam Strickson, Christoph H Emmerich, Eddy T H Goh, Jiazhen Zhang, Ian R Kelsall, Thomas Macartney, C James Hastie, Axel Knebel, Mark Peggie, Francesco Marchesi, J Simon C Arthur, Philip Cohen
It is widely accepted that the essential role of TRAF6 in vivo is to generate the Lys63-linked ubiquitin (K63-Ub) chains needed to activate the "master" protein kinase TAK1. Here, we report that TRAF6 E3 ligase activity contributes to but is not essential for the IL-1-dependent formation of K63-Ub chains, TAK1 activation, or IL-8 production in human cells, because Pellino1 and Pellino2 generate the K63-Ub chains required for signaling in cells expressing E3 ligase-inactive TRAF6 mutants. The IL-1-induced formation of K63-Ub chains and ubiquitylation of IRAK1, IRAK4, and MyD88 was abolished in TRAF6/Pellino1/Pellino2 triple-knockout (KO) cells, but not in TRAF6 KO or Pellino1/2 double-KO cells...
April 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28402840/high-molecular-weight-components-containing-n-linked-oligosaccharides-of-ascaris-suum-extract-inhibit-the-dendritic-cells-activation-through-dc-sign-and-mr
#4
Bruna C Favoretto, Adriana A C Casabuono, José A Portes-Junior, Jacqueline F Jacysyn, Alicia S Couto, Eliana L Faquim-Mauro
Helminths, as well as their secretory/excretory products, induce a tolerogenic immune microenvironment. High molecular weight components (PI) from Ascaris suum extract down-modulate the immune response against ovalbumin (OVA). The PI exerts direct effect on dendritic cells (DCs) independent of TLR 2, 4 and MyD88 molecule and, thus, decreases the T lymphocytes response. Here, we studied the glycoconjugates in PI and the role of C-type lectin receptors (CLRs), DC-SIGN and MR, in the modulation of DCs activity...
April 9, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28393847/knockdown-of-toll-like-receptor-4-signaling-pathways-ameliorate-bone-graft-rejection-in-a-mouse-model-of-allograft-transplantation
#5
Jeng-Long Hsieh, Po-Chuan Shen, Po-Ting Wu, I-Ming Jou, Chao-Liang Wu, Ai-Li Shiau, Chrong-Reen Wang, Hao-Earn Chong, Shu-Han Chuang, Jia-Shiou Peng, Shih-Yao Chen
Non-union occurring in structural bone grafting is a major problem in allograft transplantation because of impaired interaction between the host and graft tissue. Activated toll-like receptor (TLR) induces inflammatory cytokines and chemokines and triggers cell-mediated immune responses. The TLR-mediated signal pathway is important for mediating allograft rejection. We evaluated the effects of local knockdown of the TLR4 signaling pathway in a mouse segmental femoral graft model. Allografts were coated with freeze-dried lentiviral vectors that encoded TLR4 and myeloid differentiation primary response gene 88 (MyD88) short-hairpin RNA (shRNA), which were individually transplanted into the mice...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28356067/probiotic-bacteria-prevent-salmonella-induced-suppression-of-lymphoproliferation-in-mice-by-an-immunomodulatory-mechanism
#6
R Doug Wagner, Shemedia J Johnson
BACKGROUND: Salmonella enterica infections often exhibit a form of immune evasion. We previously observed that probiotic bacteria could prevent inhibition of lymphoproliferation and apoptosis responses of T cells associated with S. enterica infections in orally challenged mice. RESULTS: In this study, changes in expression of genes related to lymphocyte activation in mucosa-associated lymphoid tissues (MALT) of mice orally infected with S. enterica with and without treatment with probiotic bacteria were evaluated...
March 29, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28339054/overexpression-of-tim-3-reduces-helicobacter-pylori-associated-inflammation-through-tlr4-nf%C3%AE%C2%BAb-signaling-in%C3%A2-vitro
#7
Fucai Wang, Zhirong Mao, Dongsheng Liu, Jing Yu, Youhua Wang, Wen Ye, Dongjia Lin, Nanjin Zhou, Yong Xie
The present study aimed to investigate the interaction between T-cell immunoglobulin and mucin-domain-containing molecule-3 (Tim-3) and Toll-like receptor 4 (TLR4)/nuclear factor κB (NF‑κB) signaling in Helicobacter pylori-infected RAW264.7 macrophage cells. RAW264.7 cells were co‑cultured with H. pylori SS1 at different bacteria/cell ratios, and subsequently the mRNA expression of Tim‑3, TLR4, and myeloid differentiation factor 88 (MyD88) was measured by reverse transcription-quantitative polymerase chain reaction (RT‑qPCR)...
March 21, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28262817/om-85-is-an-immunomodulator-of-interferon-%C3%AE-production-and-inflammasome-activity
#8
A T Dang, C Pasquali, K Ludigs, G Guarda
The inflammasome-IL-1 axis and type I interferons (IFNs) have been shown to exert protective effects upon respiratory tract infections. Conversely, IL-1 has also been implicated in inflammatory airway pathologies such as asthma and chronic obstructive pulmonary disease (COPD). OM-85 is a bacterial extract with proved efficacy against COPD and recurrent respiratory tract infections, a cause of co-morbidity in asthmatic patients. We therefore asked whether OM-85 affects the above-mentioned innate immune pathways...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28259699/chicken-il-26-regulates-immune-responses-through-the-jak-stat-and-nf-%C3%AE%C2%BAb-signaling-pathways
#9
Anh Duc Truong, Yeojin Hong, Cong Thanh Hoang, Janggeun Lee, Yeong Ho Hong
Chicken interleukin 26 (ChIL-26), a member of the IL-10 family, is expressed in T cells and can induce expression of proinflammatory cytokines. We examined the response of signal transduction pathways to ChIL-26 stimulation in the chicken T (CU91), macrophage (HD11), and fibroblast (OU2) cell lines. ChIL-26 activated JAK2 and TYK2 phosphorylation, as well as activation of STAT1, STAT3, and SHP2 via tyrosine/serine residues. We also showed that ChIL-26 activates the phosphorylation of NF-κB1, TAK1, and MyD88 kinase, which are key regulators of NF-κB signaling pathways...
March 2, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28235842/acquired-mutations-associated-with-ibrutinib-resistance-in-waldenstrom-macroglobulinemia
#10
Lian Xu, Nicholas Tsakmaklis, Guang Yang, Jiaji G Chen, Xia Liu, Maria Demos, Amanda Kofides, Christopher J Patterson, Kirsten Meid, Joshua Gustine, Toni Dubeau, M Lia Palomba, Ranjana Advani, Jorge J Castillo, Richard R Furman, Zachary R Hunter, Steven P Treon
Ibrutinib produces high response rates and durable remissions in Waldenstrom's Macroglobulinemia (WM) that are impacted by MYD88 and CXCR4(WHIM) mutations. Disease progression can develop on ibrutinib, though the molecular basis remains to be clarified. We sequenced sorted CD19(+) lymphoplasmacytic cells from 6 WM patients who progressed after achieving major responses on ibrutinib using Sanger, TA cloning and sequencing, and highly sensitive and specific AS-PCR assays that we developed for BTK mutations. AS-PCR assays were used to screen patients with and without progressive disease on ibrutinib, and ibrutinib-naïve disease...
February 24, 2017: Blood
https://www.readbyqxmd.com/read/28220116/cpg-odn-shapes-alum-adjuvant-activity-signaling-via-myd88-and-il-10
#11
Luciana Mirotti, Ricardo Wesley Alberca Custódio, Eliane Gomes, Florencia Rammauro, Eliseu Frank de Araujo, Vera Lucia Garcia Calich, Momtchilo Russo
Aluminum-containing adjuvants usually referred as Alum are considered as T helper type-2 (Th2) adjuvants, while agonists of toll-like receptors (TLRs) are viewed as adjuvants that favor Th1/Th17 immunity. Alum has been used in numerous vaccine formulations; however, its undesired pro-Th2 adjuvant activity constitutes a caveat for Alum-based vaccines. Combining Alum with TLR-dependent, pro-Th1/Th17 adjuvants might dampen the pro-Th2 activity and improve the effectiveness of vaccine formulations. Here, using the ovalbumin (OVA) model of allergic lung inflammation, we found that sensitization with the synthetic TLR9 agonist, which is composed of oligodeoxynucleotides containing CpG motifs adsorbed to Alum, inhibited the development of OVA-induced lung allergic Th2 responses without shifting toward a Th1 pattern...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28193909/rv2299c-a-novel-dendritic-cell-activating-antigen-of-mycobacterium-tuberculosis-fused-esat-6-subunit-vaccine-confers-improved-and-durable-protection-against-the-hypervirulent-strain-hn878-in-mice
#12
Han-Gyu Choi, Seunga Choi, Yong Woo Back, Seungwha Paik, Hye-Soo Park, Woo Sik Kim, Hongmin Kim, Seung Bin Cha, Chul Hee Choi, Sung Jae Shin, Hwa-Jung Kim
Understanding functional interactions between DCs and antigens is necessary for achieving an optimal and desired immune response during vaccine development. Here, we identified and characterized protein Rv2299c (heat-shock protein 90 family), which effectively induced DC maturation. The Rv2299c-maturated DCs showed increased expression of surface molecules and production of proinflammatory cytokines. Rv2299c induced these effects by binding to TLR4 and stimulating the downstream MyD88-, MAPK- and NF-κB-dependent signaling pathways...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28176791/il-36%C3%AE-is-a-crucial-proximal-component-of-protective-type-1-mediated-lung-mucosal-immunity-in-gram-positive-and-negative-bacterial-pneumonia
#13
M A Kovach, B Singer, G Martinez-Colon, M W Newstead, X Zeng, P Mancuso, T A Moore, S L Kunkel, M Peters-Golden, B B Moore, T J Standiford
Interleukin-36γ (IL-36γ) is a member of novel IL-1-like proinflammatory cytokine family that are highly expressed in epithelial tissues and several myeloid-derived cell types. Little is known about the role of the IL-36 family in mucosal immunity, including lung anti-bacterial responses. We used murine models of IL-36γ deficiency to assess the contribution of IL-36γ in the lung during experimental pneumonia. Induction of IL-36γ was observed in the lung in response to Streptococcus pneumoniae (Sp) infection, and mature IL-36γ protein was secreted primarily in microparticles...
February 8, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28166680/opposing-roles-of-b-lymphocyte-subsets-in-atherosclerosis
#14
Tin Kyaw, Peter Tipping, Alex Bobik, Ban-Hock Toh
Atherosclerosis is initiated by cholesterol entry into arteries that triggers chronic immune-inflammatory lesions in the vessels. Early lesions are clinically insignificant but advanced complex lesions and vulnerable rupture prone lesions impact on quality of life and can be life threatening. Rupture of vulnerable atherosclerotic lesions initiates thrombotic occlusion of vital arteries precipitating heart attacks and strokes that remain major killers globally despite therapeutic use of statins to lower blood cholesterol levels...
February 2017: Autoimmunity
https://www.readbyqxmd.com/read/28137851/a-mechanism-for-the-induction-of-type-2-immune-responses-by-a-protease-allergen-in-the-genital-tract
#15
Ji Eun Oh, Dong Sun Oh, Hi Eun Jung, Heung Kyu Lee
The genital mucosa is a barrier that is constantly exposed to a variety of pathogens, allergens, and external stimuli. Although both allergen exposure and parasite infections frequently occur in the genital area, the mechanism by which immune responses-particularly type 2 immunity-are induced has rarely been studied in the genital mucosa. Here, we demonstrate the induction of T helper type 2 (Th2) immunity in the genital mucosa in response to a model allergen, the protease papain. Intravaginal papain immunization induced type 2 immunity in a manner that was dependent on protease activity and the estrous phase of the mice...
February 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28131813/microrna-146a-induction-during-influenza-h3n2-virus-infection-targets-and-regulates-traf6-levels-in-human-nasal-epithelial-cells-hnecs
#16
Yuqin Deng, Yan Yan, Kai Sen Tan, Jing Liu, Vincent T Chow, Ze-Zhang Tao, De-Yun Wang
We have previously shown that human nasal epithelial cells (hNECs) are highly permissive cells for respiratory viruses including influenza A virus (IAV) and respiratory syncytial virus. Recent studies have indicated that microRNAs (miRNAs) are involved in virus-host relationship, and this led us to investigate its essential roles in the in vitro hNECs model derived from multiple donors. By comparing the differential expression of miRNAs upon IAV infection among animal and cell line studies, candidates were selected with focus on the initial immune response...
March 15, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28126263/treponema-pallidum-flagellins-elicit-proinflammatory-cytokines-from-human-monocytes-via-tlr5-signaling-pathway
#17
Man Xu, Yafeng Xie, Chuanhao Jiang, Yongjian Xiao, Xingxing Kuang, Yating Wen, Yuan Tan, Manyi Tan, Feijun Zhao, Tiebing Zeng, Yimou Wu
The tissue damage caused by syphilis infection may be associated with inflammation. However, the virulence factors of Treponema pallidum are still unclear, nor are the molecular mechanisms for leading to the productions of proinflammatory cytokines. Flagellin, a classic pathogen-associated molecular pattern (PAMP), is a potent immunogen that induces inflammation. In the present study, we have demonstrated that stimulations of human monocytes with Treponema pallidum FlaB1, FlaB2, and FlaB3 result in the up regulation of interleukin (IL)-6 and IL-8...
January 21, 2017: Immunobiology
https://www.readbyqxmd.com/read/28125560/o-012-il-36-signaling-controls-the-induced-regulatory-t-cell-th9-cell-balance-and-gut-inflammation
#18
Akihito Harusato, Hirohito Abo, Vu Ngo, Samuel Yi, Satoru Osuka, Jakob Kohlmeier, Jian-Dong Li, Andrew Gewirtz, Asma Nusrat, Timothy Denning
BACKGROUND: In the United States over 1.4 million people suffer from inflammatory bowel disease (IBD). Therefore, there is a pressing need for the development of novel molecular therapeutics targeting pro-inflammatory mediators. Recently a novel interleukin-1 family member, IL-36γ was shown to be up-regulated in patients with inflammatory bowel disease (IBD) and to play an important role in healing of acute intestinal damage in mice, however, the function of IL-36γ with regards to T helper (TH) cell differentiation during gut inflammation remains undefined...
February 2017: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/28111358/identification-of-a-gene-encoding-a-membrane-anchored-toll-like-receptor-5-tlr5m-in-oplegnathus-fasciatus-that-responds-to-flagellin-challenge-and-activates-nf-%C3%AE%C2%BAb
#19
Navaneethaiyer Umasuthan, S D N K Bathige, William Shanthakumar Thulasitha, R G P T Jayasooriya, Younhee Shin, Jehee Lee
Toll-like receptor 5 (TLR5) recognizes bacterial flagellin and induces the downstream signaling through the myeloid differentiation primary response gene 88 (MyD88) protein to produce proinflammatory cytokines. In this study, we describe a TLR5 membrane form (OfTLR5M) and its adaptor protein MyD88 (OfMyD88) in rock bream, Oplegnathus fasciatus. Both Oftlr5m (6.7 kb) and Ofmyd88 (3.7 kb) genes displayed a quinquepartite structure with five exons and four introns. Protein structure of OfTLR5M revealed the conventional architecture of TLRs featured by an extracellular domain with 22 leucine rich repeats (LRR), a transmembrane domain and an endodomain with TIR motif...
March 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28110075/tlr9-mediated-regulatory-b10-cell-amplification-following-sub-total-body-irradiation-implications-in-attenuating-eae
#20
Jinsheng Hong, Jie Fang, Ruilong Lan, Qi Tan, Yeping Tian, Mei Zhang, Paul Okunieff, Lurong Zhang, Jianhua Lin, Deping Han
Autoimmunity and inflammation are controlled in part by regulatory B (Breg) cells, including the recently identified IL-10-competent B10 cell subset that represents 1%-3% of mouse spleen B cells. In this study, the influence of irradiation on Breg/B10 cell generation and IL-10 production mediated by TLR9 signaling pathways was investigated. Spleen and peritoneal cavity Breg/B10 cell frequencies were significantly expanded three weeks after sub-total body irradiation (sub-TBI, 5Gy or 10Gy) in adult male wild type (WT) C57BL/6(B6) mice but not in TLR9(-/-) mice...
March 2017: Molecular Immunology
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