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plasmacytoid dendritic cells

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https://www.readbyqxmd.com/read/29676785/sustained-cross-presentation-capacity-of-murine-splenic-dendritic-cell-subsets-in-vivo
#1
Nataschja I Ho, Marcel G M Camps, Edwin F E de Haas, Ferry Ossendorp
An exclusive feature of dendritic cells (DCs) is their ability to cross-present exogenous antigens in MHC class I molecules. We analyzed the fate of protein antigen in antigen presenting cell (APC) subsets after uptake of naturally formed antigen-antibody complexes in vivo. We observed that murine splenic DC subsets were able to present antigen in vivo for at least a week. After ex vivo isolation of four APC subsets, the presence of antigen in the storage compartments was visualized by confocal microscopy. Although all APC subsets stored antigen for many days, their ability and kinetics in antigen presentation was remarkably different...
April 20, 2018: European Journal of Immunology
https://www.readbyqxmd.com/read/29673738/tbk1-a-key-regulator-and-potential-treatment-target-for-interferon-positive-sj%C3%A3-gren-s-syndrome-systemic-lupus-erythematosus-and-systemic-sclerosis
#2
Iris L A Bodewes, Erika Huijser, Cornelia G van Helden-Meeuwsen, Liselotte Tas, Ruth Huizinga, Virgil A S H Dalm, P Martin van Hagen, Noortje Groot, Sylvia Kamphuis, Paul L A van Daele, Marjan A Versnel
OBJECTIVE: Upregulation of type I interferons (IFN-I) is a hallmark of systemic autoimmune diseases like primary Sjögren's syndrome (pSS), systemic lupus erythematosus (SLE) and systemic sclerosis (SSc). Expression of IFN-I is induced by three different receptor families: Toll-like receptors (TLRs), RIG-like receptors (RLRs) and DNA-sensing receptors (DSRs). TANK-binding kinase (TBK1) is an important signaling hub downstream of RLRs and DSRs. TBK1 activates IRF3 and IRF7, leading to IFN-I production and subsequent induction of interferon stimulated genes (ISGs)...
April 16, 2018: Journal of Autoimmunity
https://www.readbyqxmd.com/read/29669251/self-renewal-and-toll-like-receptor-signaling-sustain-exhausted-plasmacytoid-dendritic-cells-during-chronic-viral-infection
#3
Monica Macal, Yeara Jo, Simone Dallari, Aaron Y Chang, Jihong Dai, Shobha Swaminathan, Ellen J Wehrens, Patricia Fitzgerald-Bocarsly, Elina I Zúñiga
Although characterization of T cell exhaustion has unlocked powerful immunotherapies, the mechanisms sustaining adaptations of short-lived innate cells to chronic inflammatory settings remain unknown. During murine chronic viral infection, we found that concerted events in bone marrow and spleen mediated by type I interferon (IFN-I) and Toll-like receptor 7 (TLR7) maintained a pool of functionally exhausted plasmacytoid dendritic cells (pDCs). In the bone marrow, IFN-I compromised the number and the developmental capacity of pDC progenitors, which generated dysfunctional pDCs...
April 17, 2018: Immunity
https://www.readbyqxmd.com/read/29666036/report-on-three-patients-with-blastic-plasmacytoid-dendritic-cell-neoplasm
#4
Hale Bülbül, Nazan Özsan, Mine Hekimgil, Güray Saydam, Mahmut Töbü
No abstract text is available yet for this article.
April 18, 2018: Turkish Journal of Haematology: Official Journal of Turkish Society of Haematology
https://www.readbyqxmd.com/read/29665030/dermatologic-toxicity-from-novel-therapy-using-antimicrobial-peptide-ll-37-in-melanoma-a-detailed-examination-of-the-clinicopathologic-features
#5
Tsetan Dolkar, Celestine M Trinidad, Kelly C Nelson, Rodabe N Amaria, Priyadharsini Nagarajan, Carlos A Torres-Cabala, Doina Ivan, Victor G Prieto, Michael T Tetzlaff, Jonathan L Curry, Phyu P Aung
LL-37 is a naturally occurring 37-amino acid that is part of innate immunity in human skin. Preclinical studies have demonstrated that intra-tumoral injections of LL-37 stimulate the innate immune system by activation of plasmacytoid dendritic cells, which mediate tumor destruction. LL-37 intra-tumoral injections have been utilized in a Phase 1 clinical trial for melanoma patients with cutaneous metastases. We report dermatologic toxicity in a 63-year-old woman with stage IIIC melanoma of the right calf and inguinal lymph nodes...
April 17, 2018: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/29655616/role-of-innate-immunity-in-pathophysiology-of-classical-swine-fever-virus-infection
#6
REVIEW
Mohsan Ullah Goraya, Fozia Ziaghum, Shilong Chen, Ali Raza, Ye Chen
Classical swine fever virus (CSFV) infection causes mild to severe diseases among pigs, depending on the age and immune status of the host and viral strains. CSFV targets various cells, including macrophages and conventional and plasmacytoid dendritic cells. Classical swine fever is one of the most devastating diseases of pigs which leads to high morbidity and mortality, and causes significant economic loss worldwide. In response to infection with CSFV, host innate immune system eliminates the virus by recognizing specific viral molecules via distinct cellular pattern recognition receptors...
April 12, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29652910/elderly-dendritic-cells-respond-to-lps-ifn-%C3%AE-and-cd40l-stimulation-despite-incomplete-maturation
#7
Joanne K Gardner, Scott M J Cornwall, Arthur W Musk, John Alvarez, Cyril D S Mamotte, Connie Jackaman, Anna K Nowak, Delia J Nelson
There is evidence that dendritic cells (DCs) undergo age-related changes that modulate their function with their key role being priming antigen-specific effector T cells. This occurs once DCs develop into antigen-presenting cells in response to stimuli/danger signals. However, the effects of aging on DC responses to bacterial lipopolysaccharide (LPS), the pro-inflammatory cytokine interferon (IFN)-γ and CD40 ligand (CD40L) have not yet been systematically evaluated. We examined responses of blood myeloid (m)DC1s, mDC2s, plasmacytoid (p)DCs, and monocyte-derived DCs (MoDCs) from young (21-40 years) and elderly (60-84 years) healthy human volunteers to LPS/IFN-γ or CD40L stimulation...
2018: PloS One
https://www.readbyqxmd.com/read/29644082/characterisation-of-anifrolumab-a-fully-human-anti-interferon-receptor-antagonist-antibody-for-the-treatment-of-systemic-lupus-erythematosus
#8
Jeffrey M Riggs, Richard N Hanna, Bhargavi Rajan, Kamelia Zerrouki, Jodi L Karnell, Divya Sagar, Inna Vainshtein, Erika Farmer, Kimberly Rosenthal, Chris Morehouse, Melissa de Los Reyes, Kevin Schifferli, Meina Liang, Miguel A Sanjuan, Gary P Sims, Roland Kolbeck
Objective: We investigated the mechanistic and pharmacological properties of anifrolumab, a fully human, effector-null, anti-type I interferon (IFN) alpha receptor 1 (IFNAR1) monoclonal antibody in development for SLE. Methods: IFNAR1 surface expression and internalisation on human monocytes before and after exposure to anifrolumab were assessed using confocal microscopy and flow cytometry. The effects of anifrolumab on type I IFN pathway activation were assessed using signal transducer and activator of transcription 1 (STAT1) phosphorylation, IFN-stimulated response element-luciferase reporter cell assays and type I IFN gene signature induction...
2018: Lupus Science & Medicine
https://www.readbyqxmd.com/read/29630061/fateid-infers-cell-fate-bias-in-multipotent-progenitors-from-single-cell-rna-seq-data
#9
Josip S Herman, Sagar, Dominic Grün
To understand stem cell differentiation along multiple lineages, it is necessary to resolve heterogeneous cellular states and the ancestral relationships between them. We developed a robotic miniaturized CEL-Seq2 implementation to carry out deep single-cell RNA-seq of ∼2,000 mouse hematopoietic progenitors enriched for lymphoid lineages, and used an improved clustering algorithm, RaceID3, to identify cell types. To resolve subtle transcriptome differences indicative of lineage biases, we developed FateID, an iterative supervised learning algorithm for the probabilistic quantification of cell fate bias in progenitor populations...
April 9, 2018: Nature Methods
https://www.readbyqxmd.com/read/29616019/the-syk-coupled-c-type-lectin-receptors-dectin-2-and-dectin-3-are-involved-in-paracoccidioides-brasiliensis-recognition-by-human-plasmacytoid-dendritic-cells
#10
Nycolas Willian Preite, Claudia Feriotti, Dhêmerson Souza de Lima, Bruno Borges da Silva, Antônio Condino-Neto, Alessandra Pontillo, Vera Lúcia Garcia Calich, Flávio Vieira Loures
Plasmacytoid dendritic cells (pDCs), which have been extensively studied in the context of the immune response to viruses, have recently been implicated in host defense mechanisms against fungal infections. Nevertheless, the involvement of human pDCs during paracoccidioidomycosis (PCM), a fungal infection endemic to Latin America, has been scarcely studied. However, pDCs were found in the cutaneous lesions of PCM patients, and in pulmonary model of murine PCM these cells were shown to control disease severity...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29608758/neutrophil-extracellular-trap-release-is-associated-with-antinuclear-antibodies-in-systemic-lupus-erythematosus-and-anti-phospholipid-syndrome
#11
Maarten van der Linden, Lucas L van den Hoogen, Geertje H A Westerlaken, Ruth D E Fritsch-Stork, Joël A G van Roon, Timothy R D J Radstake, Linde Meyaard
Objectives: Increased release of neutrophil extracellular traps (NETs) is implicated in the activation of plasmacytoid dendritic cells, vascular disease and thrombosis in SLE and APS. However, studies comparing NET release between patients with SLE and APS are lacking. Here we evaluated plasma-induced NET release in a large cohort of patients with SLE, SLE + APS and primary APS in relation to clinical and serological parameters. Methods: Neutrophils from healthy controls were exposed to plasma of heterologous healthy controls (n = 27) or SLE (n = 55), SLE + APS (n = 38) or primary APS (PAPS) (n = 28) patients and NET release was quantified by immunofluorescence...
March 28, 2018: Rheumatology
https://www.readbyqxmd.com/read/29608575/ozanimod-rpc1063-a-selective-s1pr1-and-s1pr5-modulator-reduces-chronic-inflammation-and-alleviates-kidney-pathology-in-murine-systemic-lupus-erythematosus
#12
Kristen R Taylor Meadows, Marcos W Steinberg, Bryan Clemons, Matthew E Stokes, Gregory J Opiteck, Robert Peach, Fiona L Scott
Ozanimod (RPC1063) is a specific and potent small molecule modulator of the sphingosine 1-phosphate receptor 1 (S1PR1) and receptor 5 (S1PR5), which has shown therapeutic benefit in clinical trials of relapsing multiple sclerosis and ulcerative colitis. Ozanimod and its active metabolite, RP-101075, exhibit a similar specificity profile at the S1P receptor family in vitro and pharmacodynamic profile in vivo. The NZBWF1 mouse model was used in therapeutic dosing mode to assess the potential benefit of ozanimod and RP-101075 in an established animal model of systemic lupus erythematosus...
2018: PloS One
https://www.readbyqxmd.com/read/29605632/long-term-administration-of-pdc-stimulative-lactococcus-lactis-strain-decelerates-senescence-and-prolongs-the-lifespan-of-mice
#13
Tetsu Sugimura, Kenta Jounai, Konomi Ohshio, Hiroaki Suzuki, Takayoshi Kirisako, Yoshihiko Sugihara, Daisuke Fujiwara
The decline in immune function caused by aging increases the risk of infectious diseases, tumorigeneses and chronic inflammation, resulting in accelerating senescence. We previously reported a lactic acid bacteria, Lactococcus lactis strain Plasma (synonym of Lactococcus lactis subsp. lactis JCM 5805, Lc-Plasma), that stimulates plasmacytoid dendritic cells (pDCs), which play a crucial role in phylaxis from viral infection. In this study, we investigated the anti-aging effects of long-term oral administration of Lc-Plasma in a senescence-accelerated mouse strain, SAMP6...
March 29, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29597250/expression-of-tim-3-on-plasmacytoid-dendritic-cells-as-a-predictive-biomarker-of-decline-in-hiv-1-rna-level-during-art
#14
Albert Font-Haro, Vaclav Janovec, Tomas Hofman, Ladislav Machala, David Jilich, Zora Melkova, Jan Weber, Katerina Trejbalova, Ivan Hirsch
Depletion and functional impairment of circulating plasmacytoid dendritic cells (pDCs) are characteristic attributes of HIV-1-infection. The mechanism of dysfunction of pDCs is unclear. Here, we studied the development of phenotype of pDCs in a cohort of HIV-1-infected individuals monitored before the initiation and during a 9-month follow up with antiretroviral therapy (ART). Using polychromatic flow cytometry, we detected significantly higher pDC-surface expression of the HIV-1 receptor CD4, regulatory receptor BDCA-2, Fcγ receptor CD32, pDC dysfunction marker TIM-3, and the marker of killer pDC, TRAIL, in treatment-naïve HIV-1-infected individuals before initiation of ART when compared to healthy donors...
March 28, 2018: Viruses
https://www.readbyqxmd.com/read/29593811/expression-of-selected-genes-of-dendritic-and-treg-cells-in-blood-and-skin-of-morphea-patients-treated-with-uva1-phototherapy
#15
Agnieszka J Osmola-Mańkowska, Ewa Teresiak-Mikołajczak, Michał J Kowalczyk, Ryszard W Żaba, Zygmunt Adamski, Aleksandra Dańczak-Pazdrowska
Introduction: Morphea is a chronic autoimmune disease characterized by fibrosis of the skin. Dendritic cells (DC) and regulatory T cells (Tregs) play a significant role in development of autoimmune and tolerance mechanisms. The aim of the study was to establish the expression of selected genes of plasmacytoid and myeloid DC, Treg cells, and the microenvironment of cytokines (interleukin-17A (IL-17A), transforming growth factor β (TGF-β)) in blood and skin of morphea patients. In addition, the effect of UVA1 phototherapy on expression of the aforementioned genes was evaluated...
March 2018: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/29593265/lymphotoxin-%C3%AE-fine-tunes-t-cell-clonal-deletion-by-regulating-thymic-entry-of-antigen-presenting-cells
#16
Noëlla Lopes, Jonathan Charaix, Oriane Cédile, Arnauld Sergé, Magali Irla
Medullary thymic epithelial cells (mTEC) purge the T cell repertoire of autoreactive thymocytes. Although dendritic cells (DC) reinforce this process by transporting innocuous peripheral self-antigens, the mechanisms that control their thymic entry remain unclear. Here we show that mTEC-CD4+ thymocyte crosstalk regulates the thymus homing of SHPS-1+ conventional DCs (cDC), plasmacytoid DCs (pDC) and macrophages. This homing process is controlled by lymphotoxin α (LTα), which negatively regulates CCL2, CCL8 and CCL12 chemokines in mTECs...
March 28, 2018: Nature Communications
https://www.readbyqxmd.com/read/29593047/il-27r-signalling-mediates-early-viral-containment-and-impacts-innate-and-adaptive-immunity-after-chronic-lymphocytic-choriomeningitis-virus-infection
#17
James A Harker, Kurt A Wong, Simone Dallari, Phuc Bao, Aleksandr Dolgoter, Yeara Jo, Ellen J Wehrens, Monica Macal, Elina I Zuniga
Chronic viral infections represent a major challenge to host's immune response and a unique network of immunological elements, including cytokines, are required for their containment. By using a model persistent infection with the natural murine pathogen lymphocytic choriomeningitis virus clone 13 (LCMV Cl13) we investigated the role of one such cytokine, interleukin 27 (IL-27), in the control of chronic infection. We found that IL-27R signalling promoted control of LCMV Cl13 as early as day 1 and 5 after infection and that il27p28 transcripts were rapidly elevated in multiple subsets of dendritic cells (DCs) and myeloid cells...
March 28, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29588478/ikaros-family-zinc-finger-1-regulates-dendritic-cell-development-and-function-in-humans
#18
Urszula Cytlak, Anastasia Resteu, Delfien Bogaert, Hye Sun Kuehn, Thomas Altmann, Andrew Gennery, Graham Jackson, Attila Kumanovics, Karl V Voelkerding, Seraina Prader, Melissa Dullaers, Janine Reichenbach, Harry Hill, Filomeen Haerynck, Sergio D Rosenzweig, Matthew Collin, Venetia Bigley
Ikaros family zinc finger 1 (IKZF1) is a haematopoietic transcription factor required for mammalian B-cell development. IKZF1 deficiency also reduces plasmacytoid dendritic cell (pDC) numbers in mice, but its effects on human DC development are unknown. Here we show that heterozygous mutation of IKZF1 in human decreases pDC numbers and expands conventional DC1 (cDC1). Lenalidomide, a drug that induces proteosomal degradation of IKZF1, also decreases pDC numbers in vivo, and reduces the ratio of pDC/cDC1 differentiated from progenitor cells in vitro in a dose-dependent manner...
March 27, 2018: Nature Communications
https://www.readbyqxmd.com/read/29588348/intratumoral-cpg-b-promotes-anti-tumoral-neutrophil-cdc-and-t-cell-cooperation-without-reprograming-tolerogenic-pdc
#19
Marion Humbert, Leslie Guery, Dale Brighouse, Sylvain Lemeille, Stephanie Hugues
Cancer immunotherapies utilize distinct mechanisms to harness the power of the immune system to eradicate cancer cells. Therapeutic vaccines, aimed at inducing active immune responses against an existing cancer, are highly dependent on the immunological microenvironment, where many immune cell types display high levels of plasticity and, depending on the context, promote very different immunological outcomes. Among them, plasmacytoid dendritic cells (pDC), known to be highly immunogenic upon inflammation, are maintained in a tolerogenic state by the tumor microenvironment...
March 27, 2018: Cancer Research
https://www.readbyqxmd.com/read/29588163/the-involvement-of-plasmacytoid-cells-in-hiv-infection-and-pathogenesis
#20
REVIEW
Alessandra Aiello, Flavia Giannessi, Zulema A Percario, Elisabetta Affabris
Plasmacytoid dendritic cells (pDCs) are a unique dendritic cell subset that are specialized in type I interferon (IFN) production. pDCs are key players in the antiviral immune response and serve as bridge between innate and adaptive immunity. Although pDCs do not represent the main reservoir of the Human Immunodeficiency Virus (HIV), they are a crucial subset in HIV infection as they influence viral transmission, target cell infection and antigen presentation. pDCs act as inflammatory and immunosuppressive cells, thus contributing to HIV disease progression...
March 21, 2018: Cytokine & Growth Factor Reviews
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