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https://www.readbyqxmd.com/read/28798316/the-proton-sensing-g-protein-coupled-receptor-t-cell-death-associated-gene-8-tdag8-shows-cardioprotective-effects-against-myocardial-infarction
#1
Akiomi Nagasaka, Chihiro Mogi, Hiroki Ono, Toshihide Nishi, Yuma Horii, Yuki Ohba, Koichi Sato, Michio Nakaya, Fumikazu Okajima, Hitoshi Kurose
Myocardial infarction (MI) is an ischaemic heart condition caused by the occlusion of coronary arteries. Following MI, lactic acid from anaerobic glycolysis increases and infiltrating immune cells produce severe inflammation, which leads to acidosis in the ischaemic heart. However, the physiological implication of this pH reduction remains largely unknown. T-cell death-associated gene 8 (TDAG8) is a proton-sensing G protein-coupled receptor found on cardiac macrophages that recognise increases in extracellular protons...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28793286/il-33-attenuates-sepsis-by-inhibiting-il-17-receptor-signaling-through-upregulation-of-socs3
#2
Ran Lv, Jinning Zhao, Min Lei, Dongju Xiao, Yijin Yu, Junran Xie
BACKGROUND/AIMS: Sepsis is a systemic inflammatory response during infection. There are limited therapeutic options for sepsis patients. Interleukin (IL)-33 has been reported recently with a beneficial effect in mouse sepsis. METHODS: In this study, we initiated a clinical study to measure serum levels of pro-inflammatory cytokines including IL-33 in sepsis patients. Next, we employed cecal ligation and puncture (CLP) to study the role of IL-33 during sepsis. To further dissect the molecular mechanism, we used in vivo knockout models and in vitro knockdown murine embryonic fibroblasts (MEFs) to investigate the cross-talk between IL-33 and IL-17 signaling, and to identify the potential downstream mediators...
August 9, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28769886/a-unique-subset-of-%C3%AE-%C3%AE-t-cells-expands-and-produces-il-10-in-patients-with-naturally-acquired-immunity-against-falciparum-malaria
#3
Tomoyo Taniguchi, Kaiissar Md Mannoor, Daisuke Nonaka, Hiromu Toma, Changchun Li, Miwako Narita, Viengxay Vanisaveth, Shigeyuki Kano, Masuhiro Takahashi, Hisami Watanabe
Although expansions in γδ T cell populations are known to occur in the peripheral blood of patients infected with Plasmodium falciparum, the role of these cells in people with naturally acquired immunity against P. falciparum who live in malaria-endemic areas is poorly understood. We used a cross-sectional survey to investigate the role of peripheral blood γδ T cells in people living in Lao People's Democratic Republic, a malaria-endemic area. We found that the proportion of non-Vγ9 γδ T cells was higher in non-hospitalized uncomplicated falciparum malaria patients (UMPs) from this region...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28765933/gene-therapy-for-human-ovarian-cancer-cells-using-efficient-expression-of-fas-gene-combined-with-%C3%AE-%C3%AE-t-cells
#4
Jiajing Lin, Dingyuan Zeng, Hongying He, Guangping Tan, Ying Lan, Fuyan Jiang, Shuting Sheng
Low tissue specificity and efficiency of exogenous gene expression are the two major obstacles in tumor‑targeted gene therapy. The Fas cell surface death receptor (Fas)/Fas ligand pathway is one of the primary pathways responsible for the regulation of cell apoptosis. The aim of the present study was to explore whether the regulation of tumor specific promoters and a two‑step transcriptional amplification system (TSTA) assured efficient, targeted expression of their downstream Fas gene in human ovarian cancer cells, and to assess the killing effect of γδT cells on these cells with high Fas expression...
July 27, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28747917/upregulation-of-intestinal-barrier-function-in-mice-with-dss-induced-colitis-by-a-defined-bacterial-consortium-is-associated-with-expansion-of-il-17a-producing-gamma-delta-t-cells
#5
Ming Li, Bing Wang, Xiaotong Sun, Yan Tang, Xiaoqing Wei, Biying Ge, Yawei Tang, Ying Deng, Chunyang He, Jieli Yuan, Xia Li
Bacterial consortium transplantation (BCT) is a promising alternative to fecal microbiota transplantation in treating inflammatory bowel disease (IBD). Here, we showed that a defined bacterial consortium derived from healthy mice was able to enhance the intestinal barrier function of mice with dextran sulfate sodium (DSS)-induced colitis. Interestingly, we found that the bacterial consortium significantly promoted the expansion of IL-17A-producing γδT (γδT17) cells in colonic lamina propria, which was closely associated with changing of intestinal microbial composition...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28733202/v%C3%AE-4-%C3%AE-%C3%AE-t-cells-provide-an-early-source-of-il-17a-and-accelerate-skin-graft-rejection
#6
Yashu Li, Zhenggen Huang, Rongshuai Yan, Meixi Liu, Yang Bai, Guangping Liang, Xiaorong Zhang, Xiaohong Hu, Jian Chen, Chibing Huang, Baoyi Liu, Gaoxing Luo, Jun Wu, Weifeng He
Activated γδ T cells have been shown to accelerate allograft rejection. However, the precise role of skin-resident γδT cells and their subsets - Vγ5 (epidermis), Vγ1 and Vγ4 (dermis) - in skin graft rejection have not been identified. Here, using a male to female skin transplantation model, we demonstrated that Vγ4 T cells, rather than Vγ1 or Vγ5 T cells, accelerated skin graft rejection and that IL-17A was essential for Vγ4 T cell-mediated skin graft rejection. Moreover, we found that Vγ4 T cells were required for early IL-17A production in the transplanted area, both in skin grafts and in the host epidermis around grafts...
July 18, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28723553/a-commencement-for-eye-commensals
#7
Nancy J Reyes, Daniel R Saban
"Paucibacterial" levels of the normal eye surface have left immunologists wondering whether a true microbiome exists there. In this issue of Immunity, St. Leger et al. (2017) address this head-on, discovering a naturally existing commensal in mice that induces γδT cell-mediated protection from opportunistic infection.
July 18, 2017: Immunity
https://www.readbyqxmd.com/read/28638225/sodium-selenite-ameliorates-dextran-sulfate-sodium-induced-chronic-colitis-in-mice-by-decreasing-th1-th17-and-%C3%AE-%C3%AE-t-and-increasing-cd4-cd25-regulatory-t-cell-responses
#8
Li-Xuan Sang, Bing Chang, Jun-Feng Zhu, Fang-Li Yang, Yan Li, Xue-Feng Jiang, Da-Nan Wang, Chang-Long Lu, Xun Sun
AIM: To assess the effect of sodium selenite on the severity of dextran sulfate sodium (DSS)-induced colitis in C57BL/6 mice. METHODS: Mice were randomly divided into four groups (n = 10/group): normal group, selenium (Se) group, chronic colitis group, and Se + chronic colitis group. The mice were sacrificed on day 26. Survival rates, clinical symptoms, colon length, and histological changes were determined. The percentages and absolute numbers of immune system cells in the lamina propria lymphocytes (LPL) of the colon, the expression of mRNA in colon tissue, and the concentrations of Th1, Th17, and Treg cytokines in LPL from the large intestine, were measured...
June 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28584241/e-coli-promotes-human-v%C3%AE-9v%C3%AE-2%C3%A2-t-cell-transition-from-cytokine-producing-bactericidal-effectors-to-professional-phagocytic-killers-in-a-tcr-dependent-manner
#9
M Barisa, A M Kramer, Y Majani, D Moulding, L Saraiva, M Bajaj-Elliott, J Anderson, K Gustafsson
γδT cells provide immune-surveillance and host defense against infection and cancer. Surprisingly, functional details of γδT cell antimicrobial immunity to infection remain largely unexplored. Limited data suggests that γδT cells can phagocytose particles and act as professional antigen-presenting cells (pAPC). These potential functions, however, remain controversial. To better understand γδT cell-bacterial interactions, an ex vivo co-culture model of human peripheral blood mononuclear cell (PBMC) responses to Escherichia coli was employed...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28540539/involvements-of-%C3%AE-%C3%AE-t-lymphocytes-in-acute-and-chronic-skin-wound-repair
#10
Peng Xu, Xiujun Fu, Nin Xiao, Yuanyuan Guo, Qing Pei, Yinbo Peng, Yifan Zhang, Min Yao
Wound healing involves three stages including inflammation, proliferation, and tissue remodeling. The underlying mechanisms remain to be further elucidated. The inflammation is characterized by spatially and temporally changing patterns of various leukocyte subsets. It is regarded as the most crucial stage since the inflammatory response is instrumental to supplying various factors and cytokines that orchestrate healing events. As a subtype of T lymphocytes, γδ T cells play an important role in skin homeostasis, tumor immunosurveillance, and wound repair...
August 2017: Inflammation
https://www.readbyqxmd.com/read/28539607/characteristics-of-il-9-induced-by-schistosoma-japonicum-infection-in-c57bl-6-mouse-liver
#11
Lu Li, Hongyan Xie, Mei Wang, Jiale Qu, Hefei Cha, Quan Yang, Yuanfa Feng, Yanwei Qi, Huaina Qiu, Nuo Dong, Jun Huang
Liver granulomatous inflammation and fibrosis were the primary pathological changes observed during Schistosoma japonicum (S. japonicum) infection. In the present study, the characteristics of IL-9 were investigated in the liver of S. japonicum infection C57BL/6 mice. Immunofluorescence, qRT-PCR, and ELISA results demonstrated that the expression of IL-9 significantly increased after infection (P < 0.01). FACS results indicated that the peak of IL-9(+) Th9 cells in the liver mononuclear cells appeared at the early phase of infection (week 5), except that Th9 cells, CD8(+) Tc cells, NKT and γδT cells could secrete IL-9 in this model...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28469079/anti-lps-antibodies-protect-against-klebsiella-pneumoniae-by-empowering-neutrophil-mediated-clearance-without-neutralizing-tlr4
#12
Taylor S Cohen, Mark Pelletier, Lily Cheng, Meghan E Pennini, Jessica Bonnell, Romana Cvitkovic, Chew-Shun Chang, Xiaodong Xiao, Elisabetta Cameroni, Davide Corti, Elena Semenova, Paul Warrener, Bret R Sellman, JoAnn Suzich, Qun Wang, C Kendall Stover
Initial promising results with immune sera guided early human mAb approaches against Gram-negative sepsis to an LPS neutralization mechanism, but these efforts failed in human clinical trials. Emergence of multidrug resistance has renewed interest in pathogen-specific mAbs. We utilized a pair of antibodies targeting Klebsiella pneumoniae LPS, one that both neutralizes LPS/TLR4 signaling and mediates opsonophagocytic killing (OPK) (54H7) and one that only promotes OPK (KPE33), to better understand the contribution of each mechanism to mAb protection in an acutely lethal pneumonia model...
May 4, 2017: JCI Insight
https://www.readbyqxmd.com/read/28456719/abnormalities-in-cd57-cytotoxic-t-cells-and-v%C3%AE-1-%C3%AE-%C3%AE-t-cells-in-subclinical-celiac-disease-in-childhood-are-affected-by-cytomegalovirus-the-generation-r-study
#13
M A E Jansen, D van den Heuvel, V W V Jaddoe, M C van Zelm, H A Moll
Celiac disease (CD) is a digestive and autoimmune disorder driven by an immune response to modified gluten peptides. Affected intestines show infiltrates of various T-cell and NK-cell subsets. It is currently unclear if individuals with subclinical CD have systemic abnormalities in immune cells. We here studied whether subclinical CD is associated with changes in blood CD57-expressing and Vδ1-expressing lymphocytes in children, and whether cytomegalovirus (CMV) infection modifies this association. Included were 1068 children from the Generation R Study...
April 26, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28452361/elevated-levels-of-bcl-3-inhibits-treg-development-and-function-resulting-in-spontaneous-colitis
#14
Sonja Reißig, Yilang Tang, Alexei Nikolaev, Katharina Gerlach, Christine Wolf, Kathrin Davari, Christian Gallus, Joumana Masri, Ilgiz A Mufazalov, Markus F Neurath, F Thomas Wunderlich, Jörn M Schattenberg, Peter R Galle, Benno Weigmann, Ari Waisman, Elke Glasmacher, Nadine Hövelmeyer
Bcl-3 is an atypical NF-κB family member that regulates NF-κB-dependent gene expression in effector T cells, but a cell-intrinsic function in regulatory T (Treg) cells and colitis is not clear. Here we show that Bcl-3 expression levels in colonic T cells correlate with disease manifestation in patients with inflammatory bowel disease. Mice with T-cell-specific overexpression of Bcl-3 develop severe colitis that can be attributed to defective Treg cell development and function, leading to the infiltration of immune cells such as pro-inflammatory γδT cells, but not αβ T cells...
April 28, 2017: Nature Communications
https://www.readbyqxmd.com/read/28438184/microbiota-activated-cd103-dcs-stemming-from-microbiota-adaptation-specifically-drive-%C3%AE-%C3%AE-t17-proliferation-and-activation
#15
Chris Fleming, Yihua Cai, Xuan Sun, Venkatakrishna R Jala, Feng Xue, Samantha Morrissey, Yu-Ling Wei, Yueh-Hsiu Chien, Huang-Ge Zhang, Bodduluri Haribabu, Jian Huang, Jun Yan
BACKGROUND: IL-17-producing γδT cells (γδT17) promote autoinflammatory diseases and cancers. Yet, γδT17 peripheral regulation has not been thoroughly explored especially in the context of microbiota-host interaction. The potent antigen-presenting CD103(+) dendritic cell (DC) is a key immune player in close contact with both γδT17 cells and microbiota. This study presents a novel cellular network among microbiota, CD103(+) DCs, and γδT17 cells. METHODS: Immunophenotyping of IL-17r(-/-) mice and IL-17r(-/-) IRF8(-/-) mice were performed by ex vivo immunostaining and flow cytometric analysis...
April 24, 2017: Microbiome
https://www.readbyqxmd.com/read/28382974/erratum-the-microbiota-maintain-homeostasis-of-liver-resident-%C3%AE-%C3%AE-t-17-cells-in-a-lipid-antigen-cd1d-dependent-manner
#16
Fenglei Li, Xiaolei Hao, Yongyan Chen, Li Bai, Xiang Gao, Zhexiong Lian, Haiming Wei, Rui Sun, Zhigang Tian
No abstract text is available yet for this article.
April 6, 2017: Nature Communications
https://www.readbyqxmd.com/read/28377603/hmgb1-tlr4-il23-il17a-axis-promotes-paraquat-induced-acute-lung-injury-by-mediating-neutrophil-infiltration-in-mice
#17
Bailing Yan, Feng Chen, Lijun Xu, Jihong Xing, Xuefu Wang
Paraquat is a poisoning herbicide that primarily targets lung, leading to severe acute lung injury characterized by extensive neutrophil infiltration. However, the mechanisms underlying the neutrophil infiltration is not clear. In this study, we demonstrated the significance of the signaling cascade from high-mobility group box 1 (HMGB1), to Toll-like receptor 4 (TLR4), interleukin-23 (IL-23), and lastly to IL-17A during the paraquat-induced neutrophil infiltration and the subsequent lung injury in mice. Paraquat challenge significantly elevated serum levels of IL-17A and IL-23, the percentage of IL-17A-producing γδT cells in the lung, and the level of HMGB1 in bronchoalveolar lavage fluid...
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28344891/tumor-infiltrating-cd39-%C3%AE-%C3%AE-tregs-are-novel-immunosuppressive-t-cells-in-human-colorectal-cancer
#18
Guoming Hu, Pin Wu, Pu Cheng, Zhigang Zhang, Zhen Wang, Xiuyan Yu, Xuan Shao, Dang Wu, Jun Ye, Tao Zhang, Xiaochen Wang, Fuming Qiu, Jun Yan, Jian Huang
Tumor microenvironment (TME) promotes immune suppression through recruiting and expanding suppressive immune cells such as regulatory T cells (Tregs) to facilitate cancer progression. In this study, we identify a novel CD39(+) γδTreg in human colorectal cancer (CRC). CD39(+) γδTregs are the predominant regulatory T cells and have more potent immunosuppressive activity than CD4(+) or CD8(+) Tregs via the adenosine-mediated pathway but independent of TGF-β or IL-10. They also secrete cytokines including IL-17A and GM-CSF, which may chemoattract myeloid-derived suppressive cells (MDSCs), thus establishing an immunosuppressive network...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28296284/proinflammatory-cytokine-environments-can-drive-interleukin-17-overexpression-by-%C3%AE-%C3%AE-t-cells-in-systemic-juvenile-idiopathic-arthritis
#19
Christoph Kessel, Katrin Lippitz, Toni Weinhage, Claas Hinze, Helmut Wittkowski, Dirk Holzinger, Ndate Fall, Alexei A Grom, Niklas Gruen, Dirk Foell
OBJECTIVE: Systemic-onset juvenile idiopathic arthritis (JIA) is speculated to follow a biphasic course, with an initial systemic disease phase driven by innate immune mechanisms and interleukin-1β (IL-1β) as a key cytokine and a second chronic arthritic phase that may be dominated by adaptive immunity and cytokines such as IL-17A. Although a recent mouse model points to a critical role of IL-17-expressing γ/δ T cells in disease pathology, in humans, both the prevalence of IL-17 and the role of IL-17-producing cells are still unclear...
March 15, 2017: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/28225489/immunoregulation-effects-of-different-%C3%AE-%C3%AE-t-cells-and-toll-like-receptor-signaling-pathways-in-neonatal-necrotizing-enterocolitis
#20
Lei Hui, Yi Dai, Zhi Guo, Jiahui Zhang, Fang Zheng, Xiangli Bian, Zhimin Wu, Qin Jiang, Miaomiao Guo, Ke Ma, Jinping Zhang
The aim of the study was to observe cytokine and T-cell-related toll-like-receptor (TLR) changes in intestinal samples of neonatal necrotizing enterocolitis patients.Four necrotic bowels were collected from neonatal NEC patients with gestational ages of 28 to 29 weeks in our hospital, whereas 4 neonatal patients who underwent intestinal atresia surgery served as the controls. Intestinal flora was examined and IL-1, IL-2, IL-4, IL-6, IL-8, IL-10, TNF-α, IFN-γ, and IL-17 expressions in resected intestine samples, as well as in isolated gamma delta T (γδT) cells, were analyzed immunohistochemically and via quantitative RT-PCR...
February 2017: Medicine (Baltimore)
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