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https://www.readbyqxmd.com/read/28214610/virosome-bound-antigen-enhances-dc-dependent-specific-cd4-t-cell-stimulation-inducing-a-th1-and-treg-profile-in-vitro
#1
Rebecca A M Blom, Mario Amacker, Christian Moser, R Maarten van Dijk, Raffaela Bonetti, Emilie Seydoux, Sean R R Hall, Christophe von Garnier, Fabian Blank
There is considerable interest to develop antigen-carriers for immune-modulatory clinical applications, but insufficient information is available on their effects on antigen-presenting cells. We employed virosomes coupled to ovalbumin (OVA) to study their interaction with murine bone marrow-derived dendritic cells (BMDCs) and modulation of downstream T cell responses. BMDCs were treated in vitro with virosomes or liposomes prior to determining BMDC phenotype, viability, and intra-cellular trafficking. Antigen-specific CD4(+) T cell activation was measured by co-culture of BMDCs with DO11...
February 15, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28214198/tumor-derived-cd4-cd25-regulatory-t-cells-inhibit-dendritic-cells-function-by-ctla-4
#2
Xin Chen, Yong Du, Qingqing Hu, ZhiMing Huang
PURPOSE: CD4+CD25+regulatoryT cells (Tregs) play an important role in anti-tumor immune responses. Poor prognosis and declining survival rates have intimate connection with high Treg expression in cancer patients. Cytotoxic T Lymphocyte-associated protein (CTLA-4) is one of the most prominent molecules on Treg. In our previous research, we have demonstrated that HCC-derived Tregs can interfere with Dendritic cells (DCs) function and down-modulate CD80/CD86 on DCs in vitro in a cell-contact dependent way...
December 21, 2016: Pathology, Research and Practice
https://www.readbyqxmd.com/read/28213589/sh479-a-betulinic-acid-derivative-ameliorates-experimental-autoimmune-encephalomyelitis-by-regulating-the-th17-treg-balance
#3
Jing Li, Ji Jing, Yang Bai, Zhen Li, Roumei Xing, Binhe Tan, Xueyun Ma, Wenwei Qiu, Changsheng Du, Bing Du, Fan Yang, Jie Tang, Stefan Siwko, Mingyao Liu, Huaqing Chen, Jian Luo
CD4+ T helper cells, especially Th17 cells, combined with immune regulatory network dysfunction, play key roles in autoimmune diseases including multiple sclerosis (MS). Betulinic acid (BA), a natural pentacyclic triterpenoid, has been reported to be involved in anti-inflammation, in particular having an inhibitory effect on pro-inflammatory cytokine IL-17 and IFN-γ production. In this study, we screened BA derivatives and found a BA derivative, SH479, which had a greater inhibitory effect on Th17 differentiation...
February 17, 2017: Molecular Pharmacology
https://www.readbyqxmd.com/read/28213366/tumor-infiltrating-and-peripheral-blood-t-cell-immunophenotypes-predict-early-relapse-in-localized-clear-cell-renal-cell-carcinoma
#4
Nicolas A Giraldo, Etienne Becht, Yann Vano, Florent Petitprez, Laetitia Lacroix, Pierre Validire, Rafael Sanchez-Salas, Alexandre Ingels, Stephane Marie Oudard, Audrey Moatti, Bénédicte Buttard, Sarah Bourras, Claire Germain, Xavier Cathelineau, Wolf-Herman Fridman, Catherine Sautes-Fridman
PURPOSE: The efficacy of PD-1 Checkpoint Blockade (ChB) as adjuvant therapy in localized clear cell Renal Cell Carcinoma (ccRCC) is currently unknown. The identification of tumor microenvironment (TME) prognostic biomarkers in this setting may help to define which patients could benefit from ChB and to uncover new therapeutic targets. EXPERIMENTAL DESIGN: We performed multiparametric flow cytometry immunophenotypic analysis of T cells isolated from tumor tissue (TIL), adjacent non-malignant renal tissue (RIL) and peripheral blood (PBL), in a cohort of patients (n=40) with localized ccRCC...
February 17, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28212788/immunology-of-alveolar-and%C3%A2-cystic-echinococcosis-ae-and-ce
#5
B Gottstein, P Soboslay, E Ortona, J Wang, A Siracusano, D Α Vuitton
Cystic and alveolar echinococcosis are severe chronic helminthic diseases caused by the cystic growth or the intrahepatic tumour-like growth of the metacestode of Echinococcus granulosus or Echinococcus multilocularis, respectively. Both parasites have evolved sophisticated strategies to escape host immune responses, mainly by manipulating and directing this immune response towards anergy and/or tolerance. Recent research studies have revealed a number of respective immunoregulatory mechanisms related to macrophages and dendritic cell as well as T cell activities (regulatory T cells, Tregs)...
2017: Advances in Parasitology
https://www.readbyqxmd.com/read/28212561/the-tlr7-agonist-imiquimod-induces-anti-cancer-effects-via-autophagic-cell-death-and-enhances-anti-tumoral-and-systemic-immunity-during-radiotherapy-for-melanoma
#6
Jeong Hyun Cho, Hyo-Ji Lee, Hyun-Jeong Ko, Byung-Il Yoon, Jongseon Choe, Keun-Cheol Kim, Tae-Wook Hahn, Jeong A Han, Sun Shim Choi, Young Mee Jung, Kee-Ho Lee, Yun-Sil Lee, Yu-Jin Jung
Toll-like receptor (TLR) ligands are strongly considered immune-adjuvants for cancer immunotherapy and have been shown to exert direct anti-cancer effects. This study was performed to evaluate the synergistic anti-cancer and anti-metastatic effects of the TLR7 agonist imiquimod (IMQ) during radiotherapy for melanoma. The pretreatment of B16F10 or B16F1 cells with IMQ combined with γ-ionizing radiation (IR) led to enhanced cell death via autophagy, as demonstrated by increased expression levels of autophagy-related genes, and an increased number of autophagosomes in both cell lines...
February 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28211345/regulatory-t-and-b-cells-in-asthmatic-women-variations-from-pregnancy-to-postpartum
#7
C Martins, J Lima, G Nunes, L M Borrego
BACKGROUND AND OBJECTIVE: Allergic asthma and rhinitis are common in pregnancy. The immune mechanisms underlying the effects of asthma on pregnancy and vice versa are not completely understood. The aim of this study was to investigate changes in regulatory T and B cells in asthmatic women from late pregnancy to postpartum. METHODS: Four groups of women were enrolled for this study: asthmatic (n=23) and healthy (n=43) third trimester-pregnant women and asthmatic (n=33) and healthy (n=35) nonpregnant women...
2017: Journal of Investigational Allergology & Clinical Immunology
https://www.readbyqxmd.com/read/28211077/severe-bullous-pemphigoid-associated-with-pembrolizumab-therapy-for-metastatic-melanoma-with-complete-regression
#8
O Rofe, G Bar-Sela, Z Keidar, T Sezin, C D Sadik, R Bergman
Bullous pemphigoid (BP) is considered to be a humorally mediated autoimmune disease, but autoreactive T-cells and T-regulatory cells (Tregs) have also been implicated in this disease. Tregs and the programmed death-1 (PD-1) : programmed death ligand (PD-L) pathway are both critical in terminating immune response, and elimination of either can result in breakdown of tolerance and development of autoimmunity. We report a patient with metastatic malignant melanoma (MM), who underwent pembrolizumab (anti-PD-1) therapy following unsuccessful treatment with ipilimumab [anti-cytotoxic T-lymphocyte-associated protein (CTLA)-4]...
February 16, 2017: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/28210072/the-parenteral-vitamin-c-improves-sepsis-and-sepsis-induced-multiple-organ-dysfunction-syndrome-via-preventing-cellular-immunosuppression
#9
Yu-Lei Gao, Bin Lu, Jian-Hua Zhai, Yan-Cun Liu, Hai-Xia Qi, Ying Yao, Yan-Fen Chai, Song-Tao Shou
Cellular immunosuppression appears to be involved in sepsis and sepsis-induced multiple organ dysfunction syndrome (MODS). Recent evidence showed that parenteral vitamin C (Vit C) had the ability to attenuate sepsis and sepsis-induced MODS. Herein, we investigated the impact of parenteral Vit C on cellular immunosuppression and the therapeutic value in sepsis. Using cecal ligation and puncture (CLP), sepsis was induced in WT and Gulo(-/-) mice followed with 200 mg/Kg parenteral Vit C administration. The immunologic functions of CD4(+)CD25(+) regulatory T cells (Tregs) and CD4(+)CD25(-) T cells, as well as the organ functions, were determined...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28207945/cd4-cd25-garp-tregs-display-a-compromised-suppressive-function-in-patients-with-dilated-cardiomyopathy
#10
Yuzhen Wei, Kunwu Yu, Hui Wei, Xin Su, Ruirui Zhu, Huairui Shi, Haitao Sun, Quan Luo, Wenbin Xu, Junhui Xiao, Yucheng Zhong, Qiutang Zeng
Dilated cardiomyopathy (DCM) is a lethal inflammatory heart disease and closely connected with dysfunction of the immune system. Glycoprotein -A repetitions predominant (GARP) expressed on activated CD4(+) T cells with suppressive activity has been established. This study aimed to investigate the frequency and function of circulating CD4(+) CD25(+) GARP(+) regulatory T cells (Tregs) in DCM. 45 DCM patients and 46 controls were enrolled in this study. There was a significant increase in peripheral Th1 and Th17 number and their related cytokines (IFN-γ, IL-17), and an obvious decrease in Treg number, TGF-β1 levels and the expression of FOXP3 and GARP in patients with DCM as compared with controls...
February 16, 2017: Immunology
https://www.readbyqxmd.com/read/28207428/il-37-ameliorates-coxsackievirus-b3-induced-viral-myocarditis-by-modulating-the-th17-treg-immune-response
#11
Bang An, Xuefei Liu, Ge Li, Haitao Yuan
Myocarditis is a heterogeneous group of disorders defined by inflammation of the heart muscle with an excessively activated immune response. Numerous interventions have been investigated for the treatment of myocarditis while success is limited. Interleukin-37 (IL-37), a novel member of the IL-1 cytokine family, is a natural inhibitor of innate immunity associated with autoimmune diseases. However, the modulatory effect of IL-37 in myocarditis is unknown. In this study, we investigated the immunological regulation of IL-37 in the coxsackievirus B3-induced model of murine viral myocarditis...
February 14, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28206673/the-immune-system-as-a-new-possible-cell-target-for-afp-464-in-a-spontaneous-mammary-cancer-mouse-model
#12
Mariana A Callero, Cristina E Rodriguez, Aldana Sólimo, Elisa Bal de Kier Joffé, Andrea I Loaiza Perez
Aminoflavone (AFP 464, NSC 710464), an antitumor agent which recently entered phase II clinical trials, acts against estrogen-positive breast cancer (ER +). AFP 464, which has a unique mechanism of action by activating aryl hydrocarbon receptor (AhR) signaling pathway, decreased tumor size and growth rate in the estrogen dependent, Tamoxifen-sensitive spontaneous M05 mouse model. Considering that AhR has recently emerged as a physiological regulator of the innate and adaptive immune responses, we investigated whether AFP 464 modulates the immune response in our mouse model...
February 16, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28205558/plant-based-vaccines-for-oral-delivery-of-type-1-diabetes-related-autoantigens-evaluating-oral-tolerance-mechanisms-and-disease-prevention-in-nod-mice
#13
Amanda L Posgai, Clive H Wasserfall, Kwang-Chul Kwon, Henry Daniell, Desmond A Schatz, Mark A Atkinson
Autoantigen-specific immunological tolerance represents a central objective for prevention of type 1 diabetes (T1D). Previous studies demonstrated mucosal antigen administration results in expansion of Foxp3(+) and LAP(+) regulatory T cells (Tregs), suggesting oral delivery of self-antigens might represent an effective means for modulating autoimmune disease. Early preclinical experiments using the non-obese diabetic (NOD) mouse model reported mucosal administration of T1D-related autoantigens [proinsulin or glutamic acid decarboxylase 65 (GAD)] delayed T1D onset, but published data are conflicting regarding dose, treatment duration, requirement for combinatorial agents, and extent of efficacy...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202921/a-human-programmed-death-ligand-1-expressing-mouse-tumor-model-for-evaluating-the-therapeutic-efficacy-of-anti-human-pd-l1-antibodies
#14
Anfei Huang, Di Peng, Huanhuan Guo, Yinyin Ben, Xiangyang Zuo, Fei Wu, Xiaoli Yang, Fei Teng, Zhen Li, Xueming Qian, F Xiao-Feng Qin
Huge efforts have been devoted to develop therapeutic monoclonal antibodies targeting human Programmed death-ligand 1 (hPD-L1) for treating various types of human cancers. However, thus far there is no suitable animal model for evaluating the anti-tumor efficacy of such antibodies against hPD-L1. Here we report the generation of a robust and effective system utilizing hPD-L1-expressing mouse tumor cells to study the therapeutic activity and mode of action of anti-human PD-L1 in mice. The model has been validated by using a clinically proven hPD-L1 blocking antibody...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202460/t-regulatory-cells-and-dendritic-cells-protect-against-transfusion-related-acute-lung-injury-via-il-10
#15
Rick Kapur, Michael Kim, Rukhsana Aslam, Mark J McVey, Arata Tabuchi, Alice Luo, Jonathan Liu, Yuan Li, Shanjeevan Shanmugabhavananthan, Edwin R Speck, Anne Zufferey, George Yousef, Haibo Zhang, Mathew T Rondina, Andrew S Weyrich, Leendert Porcelijn, Wolfgang M Kuebler, Arthur S Slutsky, John W Semple
Transfusion-related acute lung injury (TRALI) is the leading cause of transfusion-related fatalities and is characterized by acute respiratory distress following blood transfusion. Donor antibodies are frequently involved, however, the pathogenesis and protective mechanisms in the recipient are poorly understood and specific therapies are lacking. Using newly developed murine TRALI models based on injection of anti-MHC class I antibodies, we found CD4+CD25+FoxP3+ T-regulatory cells (Tregs) and CD11c+ dendritic cells (DCs) to be critical effectors that protect against TRALI...
February 15, 2017: Blood
https://www.readbyqxmd.com/read/28199730/fentanyl-suppresses-the-survival-of-cd4-t-cells-isolated-from-human-umbilical-cord-blood-through-inhibition-of-ikks-mediated-nf-%C3%AE%C2%BAb-activation
#16
Kun Ma, Pengyu Ma, Huaihai Lu, Shuxiang Liu, Qinying Cao
The aim of this study was to investigate the effects and the underlying mechanisms of fentanyl anesthetic on T lymphocytes isolated from human umbilical cord bloodin vitro. The percentages of CD4(+) , CD8(+) , and regulatory T (Treg) cells in human umbilical cord blood mononuclear cells (UBMC) treated with fentanyl in vitrowere analyzed by flow cytometry. The levels of cytokines IFN-γ, IL-2, IL-4, and IL-17 secreted by activated CD4(+) T cells were measured by ELISA assays. Expressions of MAPK and NF-κB signaling pathway proteins were determined by Western blotting...
February 15, 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28199204/the-crossroads-between-cancer-immunity-and-autoimmunity-antibodies-to-self-antigens
#17
Monica Benvenuto, Rosanna Mattera, Laura Masuelli, Ilaria Tresoldi, Maria Gabriella Giganti, Giovanni Vanni Frajese, Vittorio Manzari, Andrea Modesti, Roberto Bei
The production of autoantibodies to self antigens is dependent on the failure of immune tolerance. Cancer cells express antigens which elicit a spontaneous immune response in cancer patients. The repertoire of autoantibodies found in cancer patients partly covers that of patients with autoimmune diseases. Biological activities of autoantibodies to self antigens may induce paraneoplastic syndromes which reflect the attempt of cancer patients to counteract tumor growth. Autoantibodies with similar specificities may have different effects in cancer and autoimmune disease patients due to different immunological microenvironments...
March 1, 2017: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28198424/human-ido-competent-long-lived-immunoregulatory-dendritic-cells-induced-by-intracellular-pathogen-and-their-fate-in-humanized-mice
#18
Rajeev K Tyagi, Brodie Miles, Rajesh Parmar, Neeraj K Garg, Sarat K Dalai, Babak Baban, Christopher W Cutler
Targeting of myeloid-dendritic cell receptor DC-SIGN by numerous chronic infectious agents, including Porphyromonas gingivalis, is shown to drive-differentiation of monocytes into dysfunctional mDCs. These mDCs exhibit alterations of their fine-tuned homeostatic function and contribute to dysregulated immune-responses. Here, we utilize P. gingivalis mutant strains to show that pathogen-differentiated mDCs from primary human-monocytes display anti-apoptotic profile, exhibited by elevated phosphorylated-Foxo1, phosphorylated-Akt1, and decreased Bim-expression...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28198408/therapeutic-effects-of-human-adipose-tissue-derived-stem-cell-hadsc-transplantation-on-experimental-autoimmune-encephalomyelitis-eae-mice
#19
Jia Li, Ying Chen, Zhibo Chen, Yuanyuan Huang, Dehao Yang, Zhongqian Su, Yiyun Weng, Xiang Li, Xu Zhang
This study is to investigate the therapeutic effects of human adipose tissue-derived stem cell (hADSC) transplantation on experimental autoimmune encephalomyelitis (EAE) in mice. EAE mouse model was established by MOG35-55 immunization. Body weight and neurological function were assessed. H&E and LFB staining was performed to evaluate histopathological changes. Flow cytometry was used to detect Th17 and Treg cells. ELISA and real-time PCR were performed to determine transcription factor and pro-inflammatory cytokine levels...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28197366/compensatory-upregulation-of-pd-1-lag-3-and-ctla-4-limits-the-efficacy-of-single-agent-checkpoint-blockade-in-metastatic-ovarian-cancer
#20
Ruea-Yea Huang, Ariel Francois, Aj Robert McGray, Anthony Miliotto, Kunle Odunsi
Tumor-associated or -infiltrating lymphocytes (TALs or TILs) co-express multiple immune inhibitory receptors that contribute to immune suppression in the ovarian tumor microenvironment (TME). Dual blockade of PD-1 along with LAG-3 or CTLA-4 has been shown to synergistically enhance T-cell effector function, resulting in a delay in murine ovarian tumor growth. However, the mechanisms underlying this synergy and the relative contribution of other inhibitory receptors to immune suppression in the ovarian TME are unknown...
2017: Oncoimmunology
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