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Regulatory T cell

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https://www.readbyqxmd.com/read/28437737/changes-in-regulatory-t-cells-in-patients-with-ovarian-cancer-undergoing-surgery-preliminary-results
#1
Meng Wu, Xian Chen, Jianfang Lou, Shuping Zhang, Xiaojie Zhang, Lei Huang, Ruihong Sun, Peijun Huang, Shiyang Pan, Fang Wang
Regulatory T cells (Treg) suppress immune responses in patients with cancer. Surgery is the most effective therapeutic strategy for ovarian cancer (OC). However, the interplay between the Treg population and surgical resection remains unclear. 61 patients with OC who received no prior treatment were enrolled in the study. Treg percentages were characterized from peripheral blood mononuclear cells. We investigated CD4(+)CD25(+), CD4(+)CD25(+)Foxp3(+), CD8(+)CD28(-), and CD8(+)Foxp3(+) Tregs in OC patients and their postoperative changes using flow cytometry...
April 21, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28437578/klrg1-impairs-treg-competitive-fitness-in-the-gut
#2
Holger Meinicke, Anna Bremser, Maria Brack, Klaudia Schrenk, Hanspeter Pircher, Ana Izcue
Immune homeostasis requires the tight, tissue-specific control of the different CD4(+) Foxp3(+) regulatory T cells (Treg) populations. The cadherin-binding inhibitory receptor KLRG1 is expressed by a subpopulation of Treg with GATA3(+) effector phenotype. Although such Treg are important for the immune balance, especially in the gut, the role of KLRG1 in Treg has not been assessed. Using KLRG1 KO mice, we found that KLRG1 deficiency does not affect Treg frequencies in spleen, mesenteric lymph nodes or intestine, or frequencies of GATA3(+) Treg in the gut...
April 24, 2017: Immunology
https://www.readbyqxmd.com/read/28437001/tumor-associated-changes-in-intestinal-epithelial-cells-cause-local-accumulation-of-klrg1-gata3-regulatory-t-cells-in-mice
#3
Holger Meinicke, Anna Bremser, Maria Brack, Paulina Akeus, Claire Pearson, Samuel Bullers, Katrin Hoffmeyer, Marc P Stemmler, Marianne Quiding-Järbrink, Ana Izcue
CD4(+) Foxp3(+) regulatory T cells (Treg) include differentiated populations of effector Treg characterized by the expression of specific transcription factors. Tumors, including intestinal malignancies, often present with local accumulation of Treg that can prevent tumor clearance, but how tumor progression leads to Treg accumulation is incompletely understood. Here using genetically modified mouse models we show that ablation of E-cadherin, a process associated with epithelial to mesenchymal transition (EMT) and tumor progression, promotes the accumulation of intestinal Treg by the specific accumulation of the KLRG1(+) GATA3(+) Treg subset...
April 24, 2017: Immunology
https://www.readbyqxmd.com/read/28436959/peptide-mhc-based-nanomedicines-for-autoimmunity-function-as-t-cell-receptor-microclustering-devices
#4
Santiswarup Singha, Kun Shao, Yang Yang, Xavier Clemente-Casares, Patricia Solé, Antonio Clemente, Jesús Blanco, Qin Dai, Fayi Song, Shang Wan Liu, Jun Yamanouchi, Channakeshava Sokke Umeshappa, Roopa Hebbandi Nanjundappa, Pascal Detampel, Matthias Amrein, César Fandos, Robert Tanguay, Susan Newbigging, Pau Serra, Anmar Khadra, Warren C W Chan, Pere Santamaria
We have shown that nanoparticles (NPs) can be used as ligand-multimerization platforms to activate specific cellular receptors in vivo. Nanoparticles coated with autoimmune disease-relevant peptide-major histocompatibility complexes (pMHC) blunted autoimmune responses by triggering the differentiation and expansion of antigen-specific regulatory T cells in vivo. Here, we define the engineering principles impacting biological activity, detail a synthesis process yielding safe and stable compounds, and visualize how these nanomedicines interact with cognate T cells...
April 24, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28436457/fasciola-hepatica-glycoconjugates-immuneregulate-dendritic-cells-through-the-dendritic-cell-specific-intercellular-adhesion-molecule-3-grabbing-non-integrin-inducing-t-cell-anergy
#5
Ernesto Rodríguez, Hakan Kalay, Verónica Noya, Natalie Brossard, Cecilia Giacomini, Yvette van Kooyk, Juan J García-Vallejo, Teresa Freire
Dendritic cell-specific ICAM-3 grabbing non-integrin (DC-SIGN) expressed on a variety of DCs, is a C-type lectin receptor that recognizes glycans on a diverse range of pathogens, including parasites. The interaction of DC-SIGN with pathogens triggers specific signaling events that modulate DC-maturation and activity and regulate T-cell activation by DCs. In this work we evaluate whether F. hepatica glycans can immune modulate DCs via DC-SIGN. We demonstrate that DC-SIGN interacts with F. hepatica glycoconjugates through mannose and fucose residues...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28436428/neuronal-ifn-beta-induced-pi3k-akt-foxa1-signalling-is-essential-for-generation-of-foxa1-treg-cells
#6
Yawei Liu, Andrea Marin, Patrick Ejlerskov, Louise Munk Rasmussen, Marco Prinz, Shohreh Issazadeh-Navikas
Neurons reprogramme encephalitogenic T cells (Tenc) to regulatory T cells (Tregs), either FoxP3(+)Tregs or FoxA1(+)Tregs. We reported previously that neuronal ability to generate FoxA1(+)Tregs was central to preventing neuroinflammation in experimental autoimmune encephalomyelitis (EAE). Mice lacking interferon (IFN)-β were defective in generating FoxA1(+)Tregs in the brain. Here we show that lack of neuronal IFNβ signalling is associated with the absence of programme death ligand-1 (PDL1), which prevents their ability to reprogramme Tenc cells to FoxA1(+)Tregs...
April 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28434981/protein-transport-inhibitors-downregulate-the-expression-of-lag-3-on-regulatory-t-cells
#7
Sara Anvari, Andrea Grimbergen, Carla M Davis, George Makedonas
Modern immunologic studies demand increasing complexity because of a need to improve our understanding of the relationship between a cell's phenotype and its function. Regulatory T cells have been defined by a narrow set of phenotypic markers, however their actual functional capacity has not been determined at the single-cell level. Although the lymphocyte activation gene 3 (LAG-3; CD223) is a key marker for the identification of exhausted T cells, it may be useful also in resolving Treg subpopulations by indicating distinct functional breadths...
April 20, 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28434942/ipsc-derived-regulatory-dendritic-cells-inhibit-allograft-rejection-by%C3%A2-generating-alloantigen-specific-regulatory-t-cells
#8
Songjie Cai, Jiangang Hou, Masayuki Fujino, Qi Zhang, Naotsugu Ichimaru, Shiro Takahara, Ryoko Araki, Lina Lu, Ji-Mei Chen, Jian Zhuang, Ping Zhu, Xiao-Kang Li
Regulatory dendritic cell (DCregs)-based immunotherapy is a potential therapeutic tool for transplant rejection. We generated DCregs from murine induced pluripotent stem cells (iPSCs), which could remain in a "stable immature stage" even under strong stimulation. Harnessing this characteristic, we hypothesized that iPS-DCregs worked as a negative vaccine to generate regulatory T cells (Tregs), and induced donor-specific allograft acceptance. We immunized naive CBA (H-2K(k)) mice with B6 (H-2K(b)) iPS-DCregs and found that Tregs (CD4(+)CD25(+)FOXP3(+)) significantly increased in CBA splenocytes...
April 18, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28434702/inhibition-or-deletion-of-angiotensin-ii-type-1-receptor-suppresses-elastase-induced-experimental-abdominal-aortic-aneurysms
#9
Haojun Xuan, Baohui Xu, Wei Wang, Hiroki Tanaka, Naoki Fujimura, Masaaki Miyata, Sara A Michie, Ronald L Dalman
OBJECTIVE: Angiotensin (Ang) II type 1 receptor (AT1) activation is essential for the development of exogenous Ang II-induced abdominal aortic aneurysms (AAAs) in hyperlipidemic animals. Experimental data derived from this modeling system, however, provide limited insight into the role of endogenous Ang II in aneurysm pathogenesis. Consequently, the potential translational value of AT1 inhibition in clinical AAA disease management remains incompletely understood on the basis of the existing literature...
April 20, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28434701/upregulated-interleukins-il-6-il-10-and-il-13-in-immunoglobulin-g4-related-aortic-aneurysm-patients
#10
Satomi Kasashima, Atsuhiro Kawashima, Yoh Zen, Satoru Ozaki, Fuminori Kasashima, Masamitsu Endo, Yasushi Matsumoto, Kengo Kawakami
OBJECTIVE: Immunoglobulin (Ig) G4-related aortic aneurysms (IgG4-AAs) are a special aortic aneurysm among IgG4-related diseases (IgG4-RDs), which are inflammatory and fibrous conditions characterized by tumorous swelling of affected organs and high serum IgG4 concentrations. Recently, IgG4-RD pathogenesis was shown to be associated with T-helper-2 (Th2) and regulatory T (Treg) dominant cytokine production, such as interleukin (IL)-4, IL-10, and IL-13. IL-6 is a key proinflammatory cytokine contributing to lymphocyte and plasmacyte maturation and to atherosclerosis and aneurysm development...
April 20, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28434120/involvement-of-fas-fasl-pathway-in-the-murine-model-of-atopic-dermatitis
#11
Karolina Bień, Magdalena Żmigrodzka, Piotr Orłowski, Aleksandra Fruba, Łukasz Szymański, Wanda Stankiewicz, Zuzanna Nowak, Tadeusz Malewski, Małgorzata Krzyżowska
OBJECTIVE AND DESIGN: The aim of this study was to elucidate the role of apoptosis mediated through Fas/FasL pathway using the mouse model of atopic dermatitis (AD). MATERIALS AND TREATMENT: AD was induced by epicutaneous application of ovalbumin (OVA) in wild-type C57BL/6, B6. MRL-Faslpr/J (Fas-) and B6Smn.C3-Faslgld/J (FasL-) mouse strains. METHODS: Skin samples were subjected to staining for Fas/FasL expression, M30 epitope and assessment of inflammatory response via immunohistochemical staining...
April 22, 2017: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/28434074/adipose-derived-stem-cells-ameliorate-experimental-murine-colitis-via-tsp-1-dependent-activation-of-latent-tgf-%C3%AE
#12
Hiroshi Takeyama, Tsunekazu Mizushima, Mamoru Uemura, Naotsugu Haraguchi, Junichi Nishimura, Taishi Hata, Chu Matsuda, Ichiro Takemasa, Masakazu Ikenaga, Kohei Murata, Hirofumi Yamamoto, Yuichiro Doki, Masaki Mori
BACKGROUND: Adipose tissue-derived stem cells (ASCs) have been investigated as therapeutic tools for a variety of autoimmune diseases, including inflammatory diseases. However, the mechanisms underlying the immunomodulatory properties of ASCs are not well understood. Here, we investigated the mechanism of regulatory T cell (Treg) induction in ASC therapy in a murine model of inflammatory bowel disease. METHODS: Acute colitis was induced in mice using dextran sulfate sodium and ASCs administered intraperitoneally...
April 22, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28434031/fkbp51s-signature-in-peripheral-blood-mononuclear-cells-of-melanoma-patients-as-a-possible-predictive-factor-for-immunotherapy
#13
Simona Romano, Ester Simeone, Anna D'Angelillo, Paolo D'Arrigo, Michele Russo, Mario Capasso, Vito Alessandro Lasorsa, Nicola Zambrano, Paolo A Ascierto, Maria Fiammetta Romano
The inhibitory immune checkpoint PD-L1/PD1 promotes the alternative splicing of the FKBP5 gene, resulting in increased expression of its variant 4 in the peripheral blood mononuclear cells of melanoma patients. The variant 4 transcript is translated into the truncated FKBP51s protein. Given the importance of co-inhibitory signalling in tumour immune escape, here we tested the potential for using FKBP51s expression to predict immunotherapy outcomes. To do this, we immunophenotyped PBMCs from 118 melanoma patients and 77 age- and sex-matched healthy controls...
April 22, 2017: Cancer Immunology, Immunotherapy: CII
https://www.readbyqxmd.com/read/28433429/immunological-function-of-langerhans-cells-in-hiv-infection
#14
Takamitsu Matsuzawa, Youichi Ogawa, Kohji Moriishi, Shinji Shimada, Tatsuyoshi Kawamura
BACKGROUND: Langerhans cells (LCs) are one of the initial target cells for HIV following sexual exposure and they are productively infected by HIV. HIV-infected LCs migrate to the draining lymph nodes (dLNs) and transmit the virus to CD4(+) T cells, leading to the dissemination of HIV. In contrast with the role of LCs in initial HIV acquisition, little is known about the modulation of immune responses by HIV-infected LCs. OBJECTIVE: We aimed to elucidate the induction of HIV-specific CD8(+) T cells and regulatory T cells (Tregs), both of which play important roles in regulating the progression of HIV infection...
April 9, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28432704/human-galectin-9-on-the-porcine-cells-affects-the-cytotoxic-activity-of-m1-differentiated-thp-1-cells-through-inducing-a-shift-in-m2-differentiated-thp-1-cells
#15
Sung Han Jung, Jeong Ho Hwang, Sang Eun Kim, Young Kyu Kim, Hyo Chang Park, Hoon Taek Lee
BACKGROUND: In xenotransplantation, immune rejection by macrophages occurs rapidly and remains a major obstacle. Studies to control immune rejection in macrophages have been continuing to date. Recent studies have reported that human galectin-9 (hGal-9) can regulate the function of regulatory T cells (Treg), as well as cytotoxicity T cells (CTL) and natural killer cells (NK). Although the effect of hGal-9 on lymphocytes has been well studied, the relationship between hGal-9 and myeloid cells has been scarcely studied...
April 21, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28432597/t-regulatory-cells-in-bone-remodelling
#16
REVIEW
Aline Bozec, Mario M Zaiss
PURPOSE OF THE REVIEW: In this review, we present the role of regulatory T (Treg) cells in bone remodelling and bone-related disease such as osteoporosis or inflammatory bone loss. We also discuss the cellular and molecular mechanism how Treg cells regulate osteoclastogenesis. RECENT FINDINGS: Treg cells could regulate osteoclastogenesis by secreting TGF-β and IL-10 as well as IL-4 cytokines. Moreover, Treg cells can additionally regulate osteoclast differentiation, in a cell-to-cell contact via the cytotoxic T lymphocyte antigen (CTLA-4)...
April 21, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28432279/il-35-induces-n2-phenotype-of-neutrophils-to-promote-tumor-growth
#17
Jiu-Ming Zou, Jian Qin, Yong-Chao Li, Yu Wang, Dong Li, Yu Shu, Chao Luo, Shan-Shan Wang, Gang Chi, Fang Guo, Gui-Mei Zhang, Zuo-Hua Feng
IL-35 is an immunosuppressive cytokine and exerts regulatory effects on T cells, B cells, macrophages and dendritic cells. Neutrophils are important innate immune cells that play key roles in tumor development. The effect of IL-35 on neutrophils remains unknown. Here, we report that IL-35 can induce N2 neutrophil polarization (protumor phenotype) by increasing G-CSF and IL-6 production, and promote neutrophil infiltration into tumor microenvironment. The sustained expression of IL-35 could promote chronic inflammation to augment the proangiogenic and immunosuppressive function of neutrophils...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28431741/chloride-dysregulation-seizures-and-cerebral-edema-a-relationship-with-therapeutic-potential
#18
REVIEW
Joseph Glykys, Volodymyr Dzhala, Kiyoshi Egawa, Kristopher T Kahle, Eric Delpire, Kevin Staley
Pharmacoresistant seizures and cytotoxic cerebral edema are serious complications of ischemic and traumatic brain injury. Intraneuronal Cl(-) concentration ([Cl(-)]i) regulation impacts on both cell volume homeostasis and Cl(-)-permeable GABAA receptor-dependent membrane excitability. Understanding the pleiotropic molecular determinants of neuronal [Cl(-)]i - cytoplasmic impermeant anions, polyanionic extracellular matrix (ECM) glycoproteins, and plasmalemmal Cl(-) transporters - could help the identification of novel anticonvulsive and neuroprotective targets...
April 18, 2017: Trends in Neurosciences
https://www.readbyqxmd.com/read/28430618/t-2-mycotoxin-toxicological-effects-and-decontamination-strategies
#19
REVIEW
Manish Adhikari, Bhawana Negi, Neha Kaushik, Anupriya Adhikari, Abdulaziz A Al-Khedhairy, Nagendra Kumar Kaushik, Eun Ha Choi
Mycotoxins are highly diverse secondary metabolites produced in nature by a wide variety of fungus which causes food contamination, resulting in mycotoxicosis in animals and humans. In particular, trichothecenes mycotoxin produced by genus fusarium is agriculturally more important worldwide due to the potential health hazards they pose. It is mainly metabolized and eliminated after ingestion, yielding more than 20 metabolites with the hydroxy trichothecenes-2 toxin being the major metabolite. Trichothecene is hazardously intoxicating due to their additional potential to be topically absorbed, and their metabolites affect the gastrointestinal tract, skin, kidney, liver, and immune and hematopoietic progenitor cellular systems...
February 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28430604/signal-transducing-adaptor-protein-2-promotes-generation-of-functional-long-term-memory-cd8-t-cells-by-preventing-terminal-effector-differentiation
#20
Daisuke Muraoka, Naohiro Seo, Tae Hayashi, Chisaki Hyuga-Amaike, Kana Okamori, Isao Tawara, Naozumi Harada, Hiroshi Shiku
Long-surviving memory CD8+ T cells generated by stimulation with appropriate tumor-associated antigens are the most aggressive and persistent tumoricidal effectors. In this event of memory CD8+ T cell development, the signal transducer and activator of transcription (STAT) proteins function as the crucial intracellular signaling molecules, but the regulatory mechanism of STATs in CD8+ T cells is not fully understood. In this study, we report for the first time, by using murine vaccination models, that signal-transducing adaptor protein-2 (STAP2) maintains the cytotoxicity of long-lived memory CD8+ T cells by controlling a STAT3/suppressor of cytokine signaling 3 (SOCS3) cascade...
February 16, 2017: Oncotarget
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