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tolerogenic dc

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https://www.readbyqxmd.com/read/28723546/local-modulation-of-antigen-presenting-cell-development-after-resolution-of-pneumonia-induces-long-term-susceptibility-to-secondary-infections
#1
Antoine Roquilly, Hamish E G McWilliam, Cedric Jacqueline, Zehua Tian, Raphael Cinotti, Marie Rimbert, Linda Wakim, Irina Caminschi, Mireille H Lahoud, Gabrielle T Belz, Axel Kallies, Justine D Mintern, Karim Asehnoune, Jose A Villadangos
Lung infections cause prolonged immune alterations and elevated susceptibility to secondary pneumonia. We found that, after resolution of primary viral or bacterial pneumonia, dendritic cells (DC), and macrophages exhibited poor antigen-presentation capacity and secretion of immunogenic cytokines. Development of these "paralyzed" DCs and macrophages depended on the immunosuppressive microenvironment established upon resolution of primary infection, which involved regulatory T (Treg) cells and the cytokine TGF-β...
July 18, 2017: Immunity
https://www.readbyqxmd.com/read/28720647/in-situ-targeting-of-dendritic-cells-sets-tolerogenic-environment-and-ameliorates-cd4-t-cell-response-in-the-postischemic-liver
#2
Dominik Funken, Hellen Ishikawa-Ankerhold, Bernd Uhl, Maximilian Lerchenberger, Markus Rentsch, Doris Mayr, Steffen Massberg, Jens Werner, Andrej Khandoga
CD4(+) T cells recruited to the liver play a key role in the pathogenesis of ischemia/reperfusion (I/R) injury. The mechanism of their activation during alloantigen-independent I/R is not completely understood. We hypothesized that liver-resident dendritic cells (DCs) interact with CD4(+) T cells in the postischemic liver and that modulation of DCs or T-cell-DC interactions attenuates liver inflammation. In mice, warm hepatic I/R (90/120-240 min) was induced. Tolerogenic DCs were generated in situ by pretreatment of animals with the vitamin D analog paricalcitol...
July 18, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28689791/peanut-specific-tr1-cells-induced-in-vitro-from-allergic-individuals-are-functionally-impaired
#3
Laurence Pellerin, Jennifer Anne Jenks, Sharon Chinthrajah, Tina Dominguez, Whitney Block, Xiaoying Zhou, Arram Noshirvan, Silvia Gregori, Maria Grazia Roncarolo, Kari Christine Nadeau, Rosa Bacchetta
BACKGROUND: Peanut allergy is a life threatening condition which lacks regulatory-approved treatment. T regulatory type 1 (Tr1) cells are potent suppressors of immune responses and can be induced in vivo upon repeated antigen exposure or in vitro using tolerogenic dendritic cells (DC-10). Whether or not oral immunotherapy (OIT) leads to antigen-specific Tr1 cell induction has not been established. OBJECTIVES: To determine whether peanut-specific Tr1 cells can be generated in vitro from peripheral blood of peanut allergic (PA) individuals at baseline or during OIT, and whether they are functional as compared to peanut-specific Tr1 cells induced from healthy controls (HC)...
July 6, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28680757/downregulation-of-ptp1b-and-tc-ptp-phosphatases-potentiate-dendritic-cell-based-immunotherapy-through-il-12-ifn%C3%AE-signaling
#4
Claudia Penafuerte, Matthew Feldhammer, John R Mills, Valerie Vinette, Kelly A Pike, Anita Hall, Eva Migon, Gerard Karsenty, Jerry Pelletier, George Zogopoulos, Michel L Tremblay
PTP1B and TC-PTP are highly related protein-tyrosine phosphatases (PTPs) that regulate the JAK/STAT signaling cascade essential for cytokine-receptor activation in immune cells. Here, we describe a novel immunotherapy approach whereby monocyte-derived dendritic cell (moDC) function is enhanced by modulating the enzymatic activities of PTP1B and TC-PTP. To downregulate or delete the activity/expression of these PTPs, we generated mice with PTP-specific deletions in the dendritic cell compartment or used PTP1B and TC-PTP specific inhibitor...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28675711/modification-of-anti-tumor-immunity-by-tolerogenic-dendritic-cells
#5
Liying Chen, Mohammad Sharif Hasni, Mikael Jondal, Konstantin Yakimchuk
Immunosuppressive functions of glucocorticoids (GC) can be mediated via various mechanisms, including the modulation of dendritic cells (DC). Our study investigates the effects of tolerogenic GC-treated DCs on NK and T cell anti-tumor responses in OT-1/Rag(-/-) mice, expressing a transgenic TCR in CD8(+) T cells. The effects caused by GC-treated DCs were compared to the responses to immunogenic, CpG-activated DCs. The effects of DCs on anti-tumor immune responses were analyzed using the EG7 tumor model, where the tumor cells express the peptide epitope recognized by OT-1 T cells...
July 4, 2017: Autoimmunity
https://www.readbyqxmd.com/read/28673320/the-clinical-importance-of-tumour-infiltrating-macrophages-and-dendritic-cells-in-periampullary-adenocarcinoma-differs-by-morphological-subtype
#6
Sebastian Lundgren, Emelie Karnevi, Jacob Elebro, Björn Nodin, Mikael C I Karlsson, Jakob Eberhard, Karin Leandersson, Karin Jirström
BACKGROUND: Dendritic cells (DC) and tumour-associated macrophages (TAM) are essential in linking the innate and adaptive immune response against tumour cells and tumour progression. These cells are also potential target for immunotherapy as well as providing a handle to investigate immune status in the tumour microenvironment. The aim of the present study was to examine their impact on prognosis and chemotherapy response in periampullary adenocarcinoma, including pancreatic cancer, with particular reference to morphological subtype...
July 3, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28601056/eliciting-th1-immune-response-using-casein-alpha-s1-loaded-dendritic-cells
#7
Saeed Daneshmandi, Maryam Nourizadeh, Zahra Pourpak, Ali Akbar Pourfathollah
Allergen-specific immunotherapy (AIT) has been recently considered as an alternative approach to ameliorate the symptoms of allergen exposure and improvement the patients' quality of life. Dendritic cells (DC) in the forms of tolerogenic or Th1-induced cells have been investigated in several studies as one of the promising approaches of AIT in allergic diseases. The aim of this study was to evaluate the potency of casein-loaded DCs in eliciting the Th1 immune responses in Balb/c mice as a potential therapeutic approach in allergic condition...
April 2017: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/28594751/dhrs9-is-a-stable-marker-of-human-regulatory-macrophages
#8
Paloma Riquelme, Giada Amodio, Camila Macedo, Aurelie Moreau, Nataša Obermajer, Christoph Brochhausen, Norbert Ahrens, Tuija Kekarainen, Fred Fändrich, Cristina Cuturi, Silvia Gregori, Diana Metes, Hans J Schlitt, Angus W Thomson, Edward K Geissler, James A Hutchinson
BACKGROUND: The human regulatory macrophage (Mreg) has emerged as a promising cell type for use as a cell-based adjunct immunosuppressive therapy in solid organ transplant recipients. In this brief report, dehydrogenase/reductase 9 (DHRS9) is identified as a robust marker of human Mregs. MATERIALS AND METHODS: The cognate antigen of a mouse monoclonal antibody raised against human Mregs was identified as DHRS9 by immunoprecipitation and MALDI-MS sequencing. Expression of DHRS9 within a panel of monocyte-derived macrophages was investigated by quantitative PCR, immunoblotting and flow cytometry...
June 7, 2017: Transplantation
https://www.readbyqxmd.com/read/28579377/dendritic-cells-conditioned-by-activin-a-induced-regulatory-t-cells-exhibit-enhanced-tolerogenic-properties-and-protect-against-experimental-asthma
#9
Maria Semitekolou, Ioannis Morianos, Aggelos Banos, Dimitris Konstantopoulos, Marina Adamou-Tzani, Tim Sparwasser, Georgina Xanthou
BACKGROUND: Previously, we have demonstrated that regulatory T (Treg) cells, induced by the cytokine activin-A, suppress Th2-mediated allergic responses and linked airway disease. Still, the effects of activin-A-induced Treg cells (act-A-iTreg cells) on the regulation of dendritic cell (DC)-driven allergic inflammation remain elusive. OBJECTIVE: Here, we investigated whether act-A-iTreg cells can modulate DC responses and endow them with enhanced tolerogenic functions...
June 1, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28559986/severe-traumatic-hemorrhagic-shock-induces-compromised-immune-barrier-function-of-the-mesenteric-lymph-node-leading-to-an-increase-in-intestinal-bacterial-translocation
#10
Jian Zhang, Yun Zhang, Tao Xu, Sheng-Jing Pan, Gang Nie, Xiao-Yan Miao, Jun-Yu Qiu, Wen-Qiao Yu, Shao-Yang Zhang, Ting-Bo Liang
Critically ill patients have increased susceptibility to translocation of gut bacteria. However, the mechanisms are complicated and remain unclear, and the aim of this study was to explore these mechanisms. Rats exposed to different levels of shock were orally administrated with bioluminescent Citrobacter. We found that severe shock caused an increase in bacterial translocation to the visceral organs, such as liver, spleen and blood, compared with mild shock. Surprisingly, bacterial translocation to mesenteric lymph node (MLN) was unchanged between the two shock groups...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28536330/-exosomes-and-immune-cells
#11
Naohiro Seo
In addition to the cytokines and cytotoxic granules, exosomes have been known as the intercellular communicator and cytotoxic missile of immune cells for the past decade. It has been well known that mature dendritic cell(DC)-derived exosomes participate in the T cell and natural killer(NK)cell activation, while immature DCs secrete tolerogenic exosomes for regulatory T(Treg)cell generation. Treg cell-derived EVs act as a suppressor against pathogenic type-1 T helper(Th1)cell responses. CD8+ T cells produce tumoricidal exosomes for preventing tumor invasion and metastasis transiently after T cell receptor(TCR)-mediated stimulation...
May 2017: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28521905/harnessing-the-properties-of-dendritic-cells-in-the-pursuit-of-immunological-tolerance
#12
REVIEW
Christopher Horton, Kumaran Shanmugarajah, Paul J Fairchild
The acquisition of self-perpetuating, immunological tolerance specific for graft alloantigens has long been described as the "holy grail" of clinical transplantation. By removing the need for life-long immunosuppression following engraftment, the adverse consequences of immunosuppressive regimens, including chronic infections and malignancy, may be avoided. Furthermore, autoimmune diseases and allergy are, by definition, driven by aberrant immunological responses to ordinarily innocuous antigens. The re-establishment of permanent tolerance towards instigating antigens may, therefore, provide a cure to these common diseases...
April 2017: Biomedical Journal
https://www.readbyqxmd.com/read/28458670/gut-microbiota-species-can-provoke-both-inflammatory-and-tolerogenic-immune-responses-in-human-dendritic-cells-mediated-by-retinoic-acid-receptor-alpha-ligation
#13
Krisztian Bene, Zsofia Varga, Viktor O Petrov, Nadiya Boyko, Eva Rajnavolgyi
Dendritic cells are considered as the main coordinators of both mucosal and systemic immune responses, thus playing a determining role in shaping the outcome of effector cell responses. However, it is still uncovered how primary human monocyte-derived DC (moDC) populations drive the polarization of helper T (Th) cells in the presence of commensal bacteria harboring unique immunomodulatory properties. Furthermore, the individual members of the gut microbiota have the potential to modulate the outcome of immune responses and shape the immunogenicity of differentiating moDCs via the activation of retinoic acid receptor alpha (RARα)...
2017: Frontiers in Immunology
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
#14
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/28388587/micro-rna-19a-interferes-with-il-10-expression-in-peripheral-dendritic-cells-of-patients-with-nasal-polyposis
#15
Xiang-Qian Luo, Jian-Bo Shao, Rui-Di Xie, Lu Zeng, Xiao-Xi Li, Shu-Qi Qiu, Xiao-Rui Geng, Li-Tao Yang, Lin-Jing Li, Da-Bo Liu, Zhi-Gang Liu, Ping-Chang Yang
The pathogenesis of nasal polyp is to be further investigated. Micro RNA (miR) plays a role in the development of allergic inflammation. Interleukin (IL)-10-producing dendritic cells (DC) have immune tolerogenic properties. This study test a hypothesis that miR-17-92 cluster is associated with suppressing IL-10 in peripheral DC. In this study, peripheral blood samples were obtained from 26 patients with nasal polyp. The CD11c DCs were isolated from the blood samples and analyzed for the expression of IL-10...
March 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/28378044/yersinia-pseudotuberculosis-supports-th17-differentiation-and-limits-de-novo-regulatory-t-cell-induction-by-directly-interfering-with-t-cell-receptor-signaling
#16
Maria Pasztoi, Agnes Bonifacius, Joern Pezoldt, Devesha Kulkarni, Jana Niemz, Juhao Yang, René Teich, Janina Hajek, Fabio Pisano, Manfred Rohde, Petra Dersch, Jochen Huehn
Adaptive immunity critically contributes to control acute infection with enteropathogenic Yersinia pseudotuberculosis; however, the role of CD4(+) T cell subsets in establishing infection and allowing pathogen persistence remains elusive. Here, we assessed the modulatory capacity of Y. pseudotuberculosis on CD4(+) T cell differentiation. Using in vivo assays, we report that infection with Y. pseudotuberculosis resulted in enhanced priming of IL-17-producing T cells (Th17 cells), whereas induction of Foxp3(+) regulatory T cells (Tregs) was severely disrupted in gut-draining mesenteric lymph nodes (mLNs), in line with altered frequencies of tolerogenic and proinflammatory dendritic cell (DC) subsets within mLNs...
August 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28377768/role-of-natural-killer-cells-in-hiv-associated-malignancies
#17
REVIEW
Fabio E Leal, Thomas A Premeaux, Mohamed Abdel-Mohsen, Lishomwa C Ndhlovu
Now in its fourth decade, the burden of HIV disease still persists, despite significant milestone achievements in HIV prevention, diagnosis, treatment, care, and support. Even with long-term use of currently available antiretroviral therapies (ARTs), eradication of HIV remains elusive and now poses a unique set of challenges for the HIV-infected individual. The occurrence of HIV-associated non-AIDS-related comorbidities outside the scope of AIDS-defining illnesses, in particular non-AIDS-defining cancers, is much greater than the age-matched uninfected population...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28342908/intestinal-dendritic-cell-licensing-through-toll-like-receptor-4-is-required-for-oral-tolerance-in-patients-with-allergic-contact-dermatitis
#18
Feriel Hacini-Rachinel, Mercedes Gomez de Agüero, Reem Kanjarawi, Ludovic Moro-Sibilot, Jean-Benoit Le Luduec, Claire Macari, Gilles Boschetti, Emilie Bardel, Philippe Langella, Bertrand Dubois, Dominique Kaiserlian
BACKGROUND: Induction of oral tolerance to haptens is an efficient way to prevent allergic contact dermatitis (ACD) in mice. Toll-like receptor (TLR)-mediated sensing of the microbiota contributes to gut homeostasis, yet whether it contributes to induction of oral tolerance has not been documented. OBJECTIVE: We examined whether oral tolerance to the contact sensitizer 2,4-dinitro-fluorobenzene (DNFB) depends on microbiota/TLRs and evaluated the role of TLR4 on the tolerogenic function of intestinal dendritic cells (DCs)...
March 22, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28277274/therapeutic-reversal-of-food-allergen-sensitivity-by-mature-retinoic-acid-differentiated-dendritic-cell-induction-of-lag3-cd49b-foxp3-regulatory-t%C3%A2-cells
#19
Wojciech Dawicki, Chunyan Li, Jennifer Town, Xiaobei Zhang, John R Gordon
BACKGROUND: Anaphylaxis is a life-threatening condition for which we have limited therapeutic options. Although specific immunotherapy for food allergies is becoming more effective, it is still laborious and carries substantial risk of adverse events. On the other hand, regulatory dendritic cell (DC) therapy is effective in mouse models of allergic disease and has been shown to work with TH2 cells from atopic asthmatic patients. OBJECTIVE: We assessed whether DC immunotherapy could reverse food allergen sensitivity in mouse models to provide proof of concept relating to their use in the clinic...
May 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28261223/regulatory-b-cells-in-pregnancy-lessons-from-autoimmunity-graft-tolerance-and-cancer
#20
REVIEW
Ruth Marian Guzman-Genuino, Kerrilyn R Diener
The success of pregnancy is contingent on the maternal immune system recognizing and accommodating a growing semi-allogeneic fetus. Specialized subsets of lymphocytes capable of negative regulation are fundamental in this process, and include the regulatory T cells (Tregs) and potentially, regulatory B cells (Bregs). Most of our current understanding of the immune regulatory role of Bregs comes from studies in the fields of autoimmunity, transplantation tolerance, and cancer biology. Bregs control autoimmune diseases and can elicit graft tolerance by inhibiting the differentiation of effector T cells and dendritic cells (DCs), and activating Tregs...
2017: Frontiers in Immunology
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