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Plasmacytoid dendritic cells cancer

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https://www.readbyqxmd.com/read/28875977/the-life-and-death-of-immune-cell-types-the-role-of-bcl-2-anti-apoptotic-molecules
#1
REVIEW
Emma M Carrington, David M Tarlinton, Daniel H Gray, Nicholas D Huntington, Yifan Zhan, Andrew M Lew
Targeting survival mechanisms of immune cells may provide an avenue for immune intervention to dampen unwanted responses (e.g. autoimmunity, immunopathology and transplant rejection) or enhance beneficial ones (e.g. immune deficiency, microbial defence and cancer immunotherapy). The selective survival mechanisms of the various immune cell types also avails the possibility of specific tailoring of such interventions. Here, we review the role of the BCL-2 anti-apoptotic family members (BCL-2, BCL-XL, BCL-W, MCL-1 and A1) on cell death/survival of the major immune cell types e...
September 6, 2017: Immunology and Cell Biology
https://www.readbyqxmd.com/read/28865147/differential-regulation-of-pd-1-and-its-ligands-in-allergic-asthma
#2
Kai Bratke, Linda Fritz, Fabian Nokodian, Kristina Geißler, Katharina Garbe, Marek Lommatzsch, J Christian Virchow
BACKGROUND: Targeting PD-1/PD-1 ligand signalling is an established treatment option for cancer. The role of these molecules in allergic asthma has been investigated in several mouse studies yielding conflicting results. However, human studies investigating the expression and regulation of PD-1 and its ligands in allergic inflammation are lacking. OBJECTIVE: To analyse the expression and regulation of PD-1 and its ligands in human allergic asthma. METHODS: The well-established human asthma model of segmental allergen challenge (SAC) was used to analyse the regulation of PD-1 and its ligands PD-L1 and PD-L2 on T lymphocytes and dendritic cells by flow cytometry...
September 2, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28853313/immunomodulatory-effects-of-heat-killed-mycobacterium-obuense-on-human-blood-dendritic-cells
#3
Samer Bazzi, Helmout Modjtahedi, Satvinder Mudan, Marcel Achkar, Charles Akle, Georges M Bahr
Heat-killed (HK) Mycobacterium obuense is a novel immunomodulator, currently undergoing clinical evaluation as an immunotherapeutic agent in the treatment of cancer. Here, we examined the effect of in vitro exposure to HK M. obuense on the expression of different categories of surface receptors on human blood myeloid (m) and plasmacytoid (p) DCs. Moreover, we have characterized the cytokine and chemokine secretion patterns of purified total blood DCs stimulated with HK M. obuense. HK M. obuense significantly up-regulated the expression of CD11c, CD80, CD83, CD86, CD274 and MHC class II in whole-blood mDCs and CD80, CD123 and MHC class II in whole-blood pDCs...
January 1, 2017: Innate Immunity
https://www.readbyqxmd.com/read/28744288/naltrexone-inhibits-il-6-and-tnf%C3%AE-production-in-human-immune-cell-subsets-following-stimulation-with-ligands-for-intracellular-toll-like-receptors
#4
Rachel Cant, Angus G Dalgleish, Rachel L Allen
The opioid antagonist naltrexone hydrochloride has been suggested to be a potential therapy at low dosage for multiple inflammatory conditions and cancers. Little is known about the immune-modulating effects of naltrexone, but an effect on the activity of toll-like receptor 4 (TLR4) has been reported. We analyzed the effects of naltrexone hydrochloride on IL-6 secretion by peripheral blood mononuclear cells (PBMC) in vitro following stimulation with ligands for TLR4 and for the intracellular receptors TLR7, TLR8, and TLR9...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28585308/immunosurveillance-profile-of-oral-squamous-cell-carcinoma-and-oral-epithelial-dysplasia-through-dendritic-and-t-cell-analysis
#5
Ana Carolina Amorim Pellicioli, Lynne Bingle, Paula Farthing, Márcio Ajudarte Lopes, Manoela Domingues Martins, Pablo Agustin Vargas
Oral squamous cell carcinomas (OSCCs) can arise from potentially malignant disorders, such as leukoplakia. The immune system plays an important role recognizing tumour precursor cells. However, due to immuno-editing mechanisms cancer cells are able to escape immune system surveillance. OBJECTIVE: To evaluate the profile of dendritic (Langerhans and plasmacytoid) and T cells in OSCC and oral epithelial dysplasia (OED) and correlate these findings with clinical data. MATERIALS AND METHODS: Fifty cases of OSCC and 48 of OED were immunostained for CD1a and CD83 dendritic Langerhans cells (DLC), CD303 plasmacytoid dendritic cells (pDC) and CD8 followed by quantitative analysis...
June 5, 2017: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/28561043/hsps-drive-dichotomous-t-cell-immune-responses-via-dna-methylome-remodelling-in-antigen-presenting-cells
#6
Lauren B Kinner-Bibeau, Abigail L Sedlacek, Michelle N Messmer, Simon C Watkins, Robert J Binder
Immune responses primed by endogenous heat shock proteins, specifically gp96, can be varied, and mechanisms controlling these responses have not been defined. Immunization with low doses of gp96 primes T helper type 1 (Th1) immune responses, whereas high-dose immunization primes responses characterized by regulatory T (Treg) cells and immunosuppression. Here we show gp96 preferentially engages conventional and plasmacytoid dendritic cells (pDCs) under low and high doses, respectively, through CD91. Global DNMT-dependent epigenetic modifications lead to changes in protein expression within these antigen-presenting cells...
May 31, 2017: Nature Communications
https://www.readbyqxmd.com/read/28479592/a-novel-agent-sl-401-induces-anti-myeloma-activity-by-targeting-plasmacytoid-dendritic-cells-osteoclastogenesis-and-cancer-stem-like-cells
#7
A Ray, D S Das, Y Song, V Macri, P Richardson, C L Brooks, D Chauhan, K C Anderson
Novel therapies for multiple myeloma (MM) can target mechanism(s) in the host-MM bone marrow (BM) microenvironment mediating MM progression and chemoresistance. Our studies showed increased numbers of tumor-promoting, immunosuppressive, and drug-resistant plasmacytoid dendritic cells (pDCs) in the MM BM microenvironment. pDC-MM cell interactions upregulate interleukin-3 (IL-3), which stimulates both pDC survival and MM cell growth. Since IL-3R is highly expressed on pDCs in the MM BM milieu, we here targeted pDCs using a novel IL-3R-targeted therapeutic SL-401...
May 8, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28439271/cross-talk-between-inhibitory-immunoreceptor-tyrosine-based-activation-motif-signaling-and-toll-like-receptor-pathways-in-macrophages-and-dendritic-cells
#8
REVIEW
Ivan Hirsch, Vaclav Janovec, Ruzena Stranska, Nathalie Bendriss-Vermare
The innate immune cells sense microbial infection and self-ligands by pathogen recognition receptors (PRRs), such as toll-like receptors (TLRs) and regulatory receptors (RRs), associated with immunoreceptor tyrosine-based activation motif (ITAM). Rapid activation and concerted action of PRRs signaling and feedback inhibitory mechanisms must be engaged to ensure the host defense functions and to prevent cytotoxicity associated with excessive activation. ITAM-associated RRs can generate stimulatory or, paradoxically, inhibitory signals...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28372797/unique-high-and-homogenous-surface-expression-of-the-transferrin-receptor-cd71-on-murine-plasmacytoid-dendritic-cells-in-different-tissues
#9
Anne Lippitsch, Yuri Chukovetskyi, Nelli Baal, Gregor Bein, Holger Hackstein
Plasmacytoid dendritic cells (pDC) are of increasing interest in cancer vaccine development, but many functions of these highly specialized, multifaceted cells are poorly understood. The transferrin receptor CD71 has also been suggested to function as an antigen uptake receptor on professional antigen-presenting cells. In this study, we employed multiparameter flow cytometry to investigate CD71 expression on various leukocyte subsets, including DC subsets, granulocytes, macrophages, T and B lymphocytes, γδ T cells, and natural killer cells...
June 2017: Cellular Immunology
https://www.readbyqxmd.com/read/28277277/immunoregulation-of-dendritic-cell-subsets-by-inhibitory-receptors-in-urothelial-cancer
#10
Mathieu F Chevalier, Perrine Bohner, Claire Pieraerts, Benoit Lhermitte, Jolanta Gourmaud, Antoine Nobile, Samuel Rotman, Valerie Cesson, Virginie Martin, Anne-Sophie Legris, Florence Dartiguenave, Dalila Gharbi, Laurence De Leval, Daniel E Speiser, Denise Nardelli-Haefliger, Patrice Jichlinski, Laurent Derré
Blockade of inhibitory receptors (IRs) overexpressed by T cells can activate antitumor immune responses, resulting in the most promising therapeutic approaches, particularly in bladder cancer, currently able to extend patient survival. Thanks to their ability to cross-present antigens to T cells, dendritic cells (DCs) are an immune cell population that plays a central role in the generation of effective antitumor T-cell responses. While IR function and expression have been investigated in T cells, very few data are available for DCs...
June 2017: European Urology
https://www.readbyqxmd.com/read/28242507/increased-tumor-infiltrating-plasmacytoid-dendritic-cells-predicts-poor-prognosis-in-oral-squamous-cell-carcinoma
#11
Nannan Han, Zun Zhang, Shengwen Liu, Andrew Ow, Min Ruan, Wenjun Yang, Chenping Zhang
OBJECTIVE: Accumulating evidence suggests that plasmacytoid dendritic cells (pDC) have a dual role not only in initiating anti-tumor immune responses but also in inducing immune tolerance to facilitate cancer development. The aim of this study was to investigate the distribution and function of tumor-infiltrating pDCs in primary oral squamous cell carcinoma (OSCC) and their relation to patient outcome. METHODS: The distribution of pDCs in 10 normal oral mucosa and 60 OSCC tissues was detected by immunohistochemistry...
February 10, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28239379/estrogen-receptor-dependent-regulation-of-dendritic-cell-development-and-function
#12
REVIEW
Sophie Laffont, Cyril Seillet, Jean-Charles Guéry
Autoimmunity, infectious diseases and cancer affect women and men differently. Because they tend to develop more vigorous adaptive immune responses than men, women are less susceptible to some infectious diseases but also at higher risk of autoimmunity. The regulation of immune responses by sex-dependent factors probably involves several non-redundant mechanisms. A privileged area of study, however, concerns the role of sex steroid hormones in the biology of innate immune cells, especially dendritic cells (DCs)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28201977/targeting-the-immune-niche-within-the-bone-marrow-microenvironment-the-rise-of-immunotherapy-in-multiple-myeloma
#13
Klaus Podar, D Jäger
Multiple Myeloma (MM) cells inhibit the development of an effective anti-MM immune response via defects in T cell function, ineffective antigen presentation; reduced phagocytic capacity; natural killer and dendritic cell dysfunction; decreased responsiveness to IL-2 and defects in B cell immunity; upregulation of inhibitory pathways; and production of excessive pro-inflammatory cytokines. Moreover, immune cells including plasmacytoid dendritic cells and macrophages trigger tumor cell proliferation, survival, and drug resistance...
February 13, 2017: Current Cancer Drug Targets
https://www.readbyqxmd.com/read/28153581/delivery-of-tlr7-agonist-to-monocytes-and-dendritic-cells-by-dcir-targeted-liposomes-induces-robust-production-of-anti-cancer-cytokines
#14
Thomas C B Klauber, Janne M Laursen, Daniel Zucker, Susanne Brix, Simon S Jensen, Thomas L Andresen
Tumor immune escape is today recognized as an important cancer hallmark and is therefore a major focus area in cancer therapy. Monocytes and dendritic cells (DCs), which are central to creating a robust anti-tumor immune response and establishing an anti-tumorigenic microenvironment, are directly targeted by the tumor escape mechanisms to develop immunosuppressive phenotypes. Providing activated monocytes and DCs to the tumor tissue is therefore an attractive way to break the tumor-derived immune suppression and reinstate cancer immune surveillance...
January 30, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28052019/tlr-activated-plasmacytoid-dendritic-cells-inhibit-breast-cancer-cell-growth-in-vitro-and-in-vivo
#15
Jing Wu, Shuang Li, Yang Yang, Shan Zhu, Mingyou Zhang, Yuan Qiao, Yong-Jun Liu, Jingtao Chen
Plasmacytoid dendritic cells (pDCs) are a unique subset of naturally occurring dendritic cells, which triggers the production of large amounts of type I interferons (IFNs) after viral infections through Toll-like receptor (TLR) 7 and TLR9. Recent studies have demonstrated that the activation of pDCs kills melanoma cells. However, the role of activated pDCs in breast cancer remains to be determined. In the present study, we generated mouse models of breast cancer and demonstrated that activated pDCs can directly kill breast tumor cells through TRAIL and Granzyme B...
February 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/27846385/an-unexpected-chink-in-the-transcriptional-armor-of-plasmacytoid-dendritic-neoplasms
#16
COMMENT
Maria Kleppe, Ross L Levine
In this issue of Cancer Cell, Ceribelli et al. use functional genomic and chemical screening to reveal the existence of a TCF4/BRD4-dependent oncogenic regulatory network in blastic plasmacytoid dendritic cell neoplasm (BPDCN) and demonstrate that BPDCN cells are highly sensitive to therapeutic targeting of this novel dependency.
November 14, 2016: Cancer Cell
https://www.readbyqxmd.com/read/27756099/icos-foxp3-tils-in-gastric-cancer-are-prognostic-markers-and-effector-regulatory-t-cells-associated-with-helicobacter-pylori
#17
Hirotsugu Nagase, Tomohira Takeoka, Shinya Urakawa, Akiko Morimoto-Okazawa, Atsunari Kawashima, Kota Iwahori, Shuji Takiguchi, Hiroyoshi Nishikawa, Eiichi Sato, Shimon Sakaguchi, Masaki Mori, Yuichiro Doki, Hisashi Wada
Regulatory T cells (Tregs) have an immunosuppressive role in the tumor microenvironment. Since effector Tregs (eTregs), which have highly suppressive functions, are located in a subpopulation of Foxp3(+) CD4(+) Tregs, the TCR-inducible costimulatory receptor (ICOS) was applied as a marker of eTregs that infiltrated gastric cancer tissue and the induction pathway of ICOS(+) Foxp3(+) cells was analyzed by flow cytometry and immunohistochemistry. In tumor-infiltrating lymphocytes (TILs), ICOS(+) Foxp3(+) CD4(+) T cells were abundantly observed in the late stages of gastric cancer...
February 1, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/27729261/dendritic-cells-in-human-lung-disease-recent-advances
#18
REVIEW
John W Upham, Yang Xi
Dendritic cells (DCs) are potent antigen-presenting cells. Because of their particular ability to initiate and regulate cell mediated and humoral immune responses, there is considerable interest in the role that DCs play in the pathogenesis of various lung diseases, especially those in which there is an excessive immune response to specific antigens (as in asthma) or a deficient immune response (as in lung cancer). A number of DC subpopulations have been defined in the lungs, including myeloid or conventional DCs that initiate T-cell immunity and antibody production and plasmacytoid DCs that have an important role in antiviral immunity and immune tolerance...
March 2017: Chest
https://www.readbyqxmd.com/read/27634836/b-cell-depletion-promotes-aortic-infiltration-of-immunosuppressive-cells-and-is-protective-of-experimental-aortic-aneurysm
#19
Basil Schaheen, Emily A Downs, Vlad Serbulea, Camila C P Almenara, Michael Spinosa, Gang Su, Yunge Zhao, Prasad Srikakulapu, Cherié Butts, Coleen A McNamara, Norbert Leitinger, Gilbert R Upchurch, Akshaya K Meher, Gorav Ailawadi
OBJECTIVE: B-cell depletion therapy is widely used for treatment of cancers and autoimmune diseases. B cells are abundant in abdominal aortic aneurysms (AAA); however, it is unknown whether B-cell depletion therapy affects AAA growth. Using experimental models of murine AAA, we aim to examine the effect of B-cell depletion on AAA formation. APPROACH AND RESULTS: Wild-type or apolipoprotein E-knockout mice were treated with mouse monoclonal anti-CD20 or control antibodies and subjected to an elastase perfusion or angiotensin II infusion model to induce AAA, respectively...
November 2016: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/27630164/transcriptional-repression-of-ifn-regulatory-factor-7-by-myc-is-critical-for-type-i-ifn-production-in-human-plasmacytoid-dendritic-cells
#20
Tae Whan Kim, Seunghee Hong, Yin Lin, Elise Murat, HyeMee Joo, Taeil Kim, Virginia Pascual, Yong-Jun Liu
Type I IFNs are crucial mediators of human innate and adaptive immunity and are massively produced from plasmacytoid dendritic cells (pDCs). IFN regulatory factor (IRF)7 is a critical regulator of type I IFN production when pathogens are detected by TLR 7/9 in pDC. However, hyperactivation of pDC can cause life-threatening autoimmune diseases. To avoid the deleterious effects of aberrant pDC activation, tight regulation of IRF7 is required. Nonetheless, the detailed mechanisms of how IRF7 transcription is regulated in pDC are still elusive...
October 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
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