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https://www.readbyqxmd.com/read/28664397/peripheral-blood-monocyte-tolerance-alleviates-intraperitoneal-lipopolysaccharides-induced-neuroinflammation-in-rats-via-upregulating-the-cd200r-expression
#1
Liping Xia, Xin Xie, Yang Liu, Xiaoguang Luo
Neuroinflammation is an important pathogenesis of Parkinson's disease (PD). The peripheral immune system could produce profound effects on central immunities. The peripheral blood monocyte (PBM) immune tolerance is the refractoriness of immune system to avoid overactive peripheral inflammation. The PBM are also actively involved in central immune activities. There is evidence implying the probable failure of immune tolerance and impairment of CD200/CD200R signaling in PD patients. Here we aimed to explore the effects of PBM tolerance in peripheral LPS-induced neuroinflammation as well as the specific roles of CD200/CD200R pathway in PBM tolerance...
June 29, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28583890/cd200-selectively-upregulates-prostaglandin-e2-and-d2-synthesis-in-lps-treated-bone-marrow-derived-macrophages
#2
Katharina Kern, Sandra Pierre, Yannick Schreiber, Carlo Angioni, Dominique Thomas, Nerea Ferreirós, Gerd Geisslinger, Klaus Scholich
The CD200/CD200R signalling pathway downregulates the synthesis of proinflammatory mediators and induces the synthesis of antiinflammatory mediators in macrophages and microglia. However, very little is known about the effect of this immunosuppressive pathway on the synthesis of lipid mediators. Therefore, we determined the synthesis of 35 lipids spanning 5 different lipid families in bone marrow-derived macrophages, which were treated with interleukin (IL) 4, IL10, lipopolysaccharide (LPS), or interferon γ (IFNγ) in absence and presence of CD200...
June 2, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28573328/human-cd200-suppresses-macrophage-mediated-xenogeneic-cytotoxicity-and-phagocytosis
#3
Rieko Sakai, Akira Maeda, Thuy-Vy Choi, Pei-Chi Lo, Patmika Jiaravuthiasan, Afifah Mod Shabri, Han-Tang Wang, Rei Matsuura, Tasuku Kodama, Hiroshi Eguchi, Hiroomi Okuyama, Shuji Miyagawa
PURPOSE: Various strategies, such as the generation of alpha-1,3-galactosyltransferase knocked-out pigs and CD55 transgenic pigs, have been investigated to inhibit pig to human xenogeneic rejection. Our aim is to develop strategies to overcome the hurdle of not only hyper acute rejection, but also that of cellular xenogeneic rejection (CXR). Although macrophages have been well known to play a critical role in CXR, monocyte/macrophage-mediated xenogeneic rejection has not been well studied...
June 1, 2017: Surgery Today
https://www.readbyqxmd.com/read/28363871/impact-of-antibody-subclass-and-disulfide-isoform-differences-on-the-biological-activity-of-cd200r-and-%C3%AE-klotho-agonist-antibodies
#4
Ognjen Grujic, Jennitte Stevens, Robert Y-T Chou, Jennifer V Weiszmann, Laura Sekirov, Christy Thomson, Anita Badh, Stephanie Grauer, Brian Chan, Kevin Graham, Kathy Manchulenko, Thomas M Dillon, Yang Li, Ian N Foltz
Agonism of cell surface receptors by monoclonal antibodies is dependent not only on its ability to bind the target, but also to deliver a biological signal through receptors to the cell. Immunoglobulin G2 antibodies (IgG2s) are made up of a mixture of distinct isoforms (IgG2-A, -B and A/B), which differ by the disulfide connectivity at the hinge region. When evaluating panels of agonistic antibodies against CD200 receptor (CD200R) or βklotho receptor (βklotho), we noticed striking activity differences of IgG1 or IgG2 antibodies with the same variable domains...
May 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28326648/changes-in-expression-of-the-cd200-tolerance-signaling-molecule-and-its-receptor-cd200r-by-villus-trophoblasts-during-first-trimester-missed-abortion-and-in-chronic-histiocytic-intervillositis
#5
David A Clark, Jennifer M Dmetrichuk, Elizabeth McCready, Sukhbinder Dhesy-Thind, Jorge L Arredondo
PROBLEM: Expression of CD200 at the feto-maternal interface is associated with successful murine and human pregnancy. CD200 binding to CD200 receptors on lymphomyeloid cells suppresses inflammation and induces Tregs. CD200 receptors are also expressed on mouse and human placental trophoblast cells. What is the expression of CD200 and CD200R in human missed abortions which have preserved Treg levels and in chronic histiocytic intervillositis (CHI) where maternal inflammatory cells cause IUGR? METHODS: Immunohistiochemistry for CD200, CD200R, and Ki67 using human placental sections from missed abortions, term placenta, and CHI...
March 22, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/28280765/data-on-ho-1-and-cd200-protein-secretion-during-t-cells-and-mesenchymal-stromal-cells-co-cultures
#6
Mohammad Fayyad-Kazan, Hussein Fayyad-Kazan, Makram Merimi, Nathalie Meuleman, Dominique Bron, Laurence Lagneaux, Mehdi Najar
In this Data in Brief, we have provided data describing the secretion profile of two main immunoregulatory proteins, heme oxygenase-1 (HO-1) and CD200, from bone marrow (BM), Wharton׳s Jelly (WJ) or adipose tissue (AT) mesenchymal stromal cells (MSCs) being cultivated either in the absence or presence of activated T-cells. Whilst HO-1 is a stress-responsive enzyme displaying diverse cytoprotective effects, CD200 is a membrane glycoprotein delivering immunoregulatory signals following interaction with its receptor (CD200R)...
April 2017: Data in Brief
https://www.readbyqxmd.com/read/28164626/expression-of-cd200r1-and-its-ligand-cd200-on-t-helper-lymphocytes-of-pediatric-patients-with-ulcerative-colitis-and-crohn-s-disease
#7
Mohamed F Elshal, Alia M Aldahlawi, Omar I Saadah, J Philip Mccoy
BACKGROUND: CD200 and its receptor CD200R are both type I membrane glycoproteins that modulate the activity of myeloid and lymphoid cells, and their interaction is functionally important in the suppression of effector T-cell responses by regulatory T-cells. We aimed to investigate the extent of expression of CD200 and CD200R1 on CD4+ T-cells in blood of children with ulcerative colitis (UC) and Crohn's disease (CD) and to explore their correlations with effector T cell subsets, regulatory T cells (Treg), and routine clinical and serological markers...
August 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28123029/newly-formed-endothelial-cells-regulate-myeloid-cell-activity-following-spinal-cord-injury-via-expression-of-cd200-ligand
#8
Merav Cohen, Hila Ben-Yehuda, Ziv Porat, Catarina Raposo, Siamon Gordon, Michal Schwartz
The central nervous system (CNS) is endowed with several immune-related mechanisms that contribute to its protection and maintenance in homeostasis and under pathology. Here, we discovered an additional mechanism that controls inflammatory responses within the CNS milieu under injurious conditions, involving CD200 ligand (CD200L) expressed by newly formed endothelial cells. We observed that CD200L is constitutively expressed in the mouse healthy CNS by endothelial cells of the blood-cerebrospinal fluid barrier and of the spinal cord meninges, but not by the endothelium of the blood-spinal cord barrier...
January 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28122021/the-effect-of-tacrolimus-and-mycophenolic-acid-on-cd14-monocyte-activation-and-function
#9
Nynke M Kannegieter, Dennis A Hesselink, Marjolein Dieterich, Rens Kraaijeveld, Ajda T Rowshani, Pieter J M Leenen, Carla C Baan
Monocytes and macrophages play key roles in many disease states, including cellular and humoral rejection after solid organ transplantation (SOT). To suppress alloimmunity after SOT, immunosuppressive drug therapy is necessary. However, little is known about the effects of the immunosuppressive drugs tacrolimus and mycophenolic acid (MPA) on monocyte activation and function. Here, the effect of these immunosuppressants on monocytes was investigated by measuring phosphorylation of three intracellular signaling proteins which all have a major role in monocyte function: p38MAPK, ERK and Akt...
2017: PloS One
https://www.readbyqxmd.com/read/28106273/the-immunoglobulin-superfamily-member-cd200r-identifies-cells-involved-in-type-2-immune-responses
#10
L H Blom, B C Martel, L F Larsen, C V Hansen, M P Christensen, N Juel-Berg, T Litman, L K Poulsen
BACKGROUND: The pathology of allergic diseases involves type 2 immune cells, such as Th2, ILC2, and basophils exerting their effect by production of IL-4, IL-5, and IL-13. However, surface receptors that are specifically expressed on type 2 immune cells are less well documented. The aim of this investigation was to identify surface markers associated with type 2 inflammation. METHODS: Naïve human CD4(+) T cells were short-term activated in the presence or absence of IL-4 and analyzed for expression of >300 cell-surface proteins...
July 2017: Allergy
https://www.readbyqxmd.com/read/28052009/cancer-associated-fibroblasts-promote-an-immunosuppressive-microenvironment-through-the-induction-and-accumulation-of-protumoral-macrophages
#11
Hideyuki Takahashi, Koichi Sakakura, Takeshi Kudo, Minoru Toyoda, Kyoichi Kaira, Tetsunari Oyama, Kazuaki Chikamatsu
Stromal cells in the tumor microenvironment (TME) closely interact with tumor cells and affect tumor cell behavior in diverse manners. We herein investigated the mechanisms by which cancer-associated fibroblasts (CAFs) affect the functional polarization of tumor-associated macrophages (TAMs) in oral squamous cell carcinoma (OSCC) in vitro and in human cancer samples. The expression of CD68, CD14, CD163, CD200R, CD206, HLA-G, CD80, and CD86 was higher in CD14-positive cells co-cultured with the culture supernatants of CAFs established from OSCC specimens (CAF-educated cells) than in control cells...
January 31, 2017: Oncotarget
https://www.readbyqxmd.com/read/27994015/newly-formed-endothelial-cells-regulate-myeloid-cell-activity-following-spinal-cord-injury-via-expression-of-cd200-ligand
#12
Merav Cohen, Hila Ben-Yehuda, Ziv Porat, Catarina Raposo, Siamon Gordon, Michal Schwartz
The central nervous system (CNS) is endowed with several immune-related mechanisms that contribute to its protection and maintenance in homeostasis and under pathology. Here, we discovered an additional mechanism that controls inflammatory responses within the CNS milieu under injurious conditions, involving CD200 ligand (CD200L) expressed by newly-formed endothelial cells. We observed that CD200L is constitutively expressed in the mouse healthy CNS by endothelial cells of the blood-cerebrospinal fluid barrier and of the spinal cord meninges, but not by the endothelium of the blood-spinal cord barrier...
December 19, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27929051/reduced-expression-of-monocyte-cd200r-is-associated-with-enhanced-proinflammatory-cytokine-production-in-sarcoidosis
#13
Simon D Fraser, Laura R Sadofsky, Paul M Kaye, Simon P Hart
In sarcoidosis, the proinflammatory cytokines interferon gamma, tumour necrosis factor and interleukin-6 are released by monocyte-derived macrophages and lymphocytes in the lungs and other affected tissues. Regulatory receptors expressed on monocytes and macrophages act to suppress cytokine production, and reduced expression of regulatory receptors may thus promote tissue inflammation. The aim of this study was to characterise the role of regulatory receptors on blood monocytes in patients with sarcoidosis...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27864635/soluble-cd200-correlates-with-interleukin-6-levels-in-sera-of-copd-patients-potential-implication-of-the-cd200-cd200r-axis-in-the-disease-course
#14
Priya Sakthivel, Angele Breithaupt, Marcus Gereke, David A Copland, Christian Schulz, Achim D Gruber, Andrew D Dick, Jens Schreiber, Dunja Bruder
BACKGROUND: COPD represents a multifactorial lung disorder with high morbidity and mortality. Despite intensive research concerning the underlying disease mechanisms, the involvement of the CD200/CD200R axis in supporting or preventing the onset of COPD has not yet been addressed. Since the CD200/CD200R axis is crucially implicated in the maintenance of pulmonary immune homeostasis, we hypothesized that it might be involved in controlling the onset of COPD. METHODS: To address this, we analyzed the serum samples from COPD patients and normal controls for soluble (s) CD200 and correlated the data to COPD-relevant clinical parameters...
November 18, 2016: Lung
https://www.readbyqxmd.com/read/27830533/analysis-of-the-impact-of-cd200-on-phagocytosis
#15
Anthony Lyons, Aedín M Minogue, Raasay S Jones, Orla Fitzpatrick, Janis Noonan, Veronica A Campbell, Marina A Lynch
One factor that impacts on microglial activation is the interaction between the ubiquitously expressed CD200 and CD200R, which is expressed only on microglia in the brain. Decreased signalling through CD200R, when CD200 expression is reduced, results in microglial activation and may, at least in part, explain the increased cell activity that is observed with age, in models of Alzheimer's and Parkinson's disease as well as in the human diseases. There is evidence of increased microglial activation in CD200-deficient mice, and isolated microglia prepared from these mice are more reactive to inflammatory stimuli like Toll-like receptor 2 and 4 agonists, and interferon-γ...
September 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/27819346/novel-cd200-homologues-isec1-and-isec2-are-gastrointestinal-secretory-cell-specific-ligands-of-inhibitory-receptor-cd200r
#16
Toshiyuki Kojima, Kiichiro Tsuchiya, Shinji Ikemizu, Soichiro Yoshikawa, Yoshinori Yamanishi, Mamoru Watanabe, Hajime Karasuyama
CD200R is an inhibitory receptor expressed on myeloid cells and some lymphoid cells, and plays important roles in negatively regulating immune responses. CD200 is the only known ligand of CD200R and broadly distributed in a variety of cell types. Here we identified novel CD200 homologues, designated iSEC1 and iSEC2, that are expressed exclusively by secretory cell lineages in the gastrointestinal epithelium while authentic CD200 is expressed by none of epithelial cells including secretory cells. Both iSEC1 and iSEC2 could bind to CD200R but not other members of the CD200R family...
November 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27746328/characterization-of-the-potential-allergenicity-of-irradiated-bovine-%C3%AE-lactalbumin-in-a-balb-c-mouse-model
#17
Xuanyi Meng, Xin Li, Jinyan Gao, Hongbing Chen
Bovine α-lactalbumin (ALA) is a known food allergen present in milk to induce anaphylaxis. A previous study demonstrated that irradiated ALA (iALA) decreased the IgE-binding properties and weakened the degranulation capacity of basophils in vitro. The present study aimed to further assess the potential allergenicity of iALA in vivo in a BALB/c mouse model. The mice (n = 10/group) were intragastrically sensitized and orally challenged with either iALA or ALA using cholera toxin as adjuvant. In contrast to the ALA group, the iALA group did not show anaphylactic shock symptoms...
November 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27742835/the-torc1-activated-proteins-p70s6k-and-grb10-regulate-il-4-signaling-and-m2-macrophage-polarization-by-modulating-phosphorylation-of-insulin-receptor-substrate-2
#18
Kristi J Warren, Xi Fang, Nagaraj M Gowda, Joshua J Thompson, Nicola M Heller
Lung M2 macrophages are regulators of airway inflammation, associated with poor lung function in allergic asthma. Previously, we demonstrated that IL-4-induced M2 gene expression correlated with tyrosine phosphorylation of the insulin receptor substrate-2 (IRS-2) in macrophages. We hypothesized that negative regulation of IRS-2 activity after IL-4 stimulation is dependent upon serine phosphorylation of IRS-2. Herein, we describe an inverse relationship between tyrosine phosphorylation (Tyr(P)) and serine phosphorylation (Ser(P)) of IRS-2 after IL-4 stimulation...
November 25, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27731341/cd200r-foxp3-mediated-signalling-regulates-microglial-activation
#19
Min-Hee Yi, Enji Zhang, Jwa-Jin Kim, Hyunjung Baek, Nara Shin, Sena Kim, Sang Ryong Kim, Hang-Rae Kim, Sung Joong Lee, Jin Bong Park, Yonghyun Kim, O-Yu Kwon, Young Ho Lee, Sang-Ha Oh, Dong Woon Kim
The heterogeneity of microglial functions have either beneficial or detrimental roles in specific physiological or pathological environments. However, the details of what transcriptional mechanisms induce microglia to take beneficial phenotypes remain unknown. Here, we report that Foxp3 is essential for beneficial outcome of the microglial response and depends upon signalling by the immunoglobulin CD200 through its receptor (CD200R). Foxp3 expression was up-regulated in microglia activated by excitotoxicity-induced hippocampal neuroinflammation...
October 12, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27629530/reduction-of-cd200-expression-in-glioma-cells-enhances-microglia-activation-and-tumor-growth
#20
Chih-Yen Wang, Yun-Ti Hsieh, Kuan-Min Fang, Chung-Shi Yang, Shun-Fen Tzeng
CD200, a type I transmembrane glycoprotein, can interact with its receptor CD200R, which plays an inhibitory role in the activation of microglia-the resident macrophages of the central nervous system. In this study, the rat C6 glioma cell line (C6-1) that was previously characterized with high in vivo tumorigenicity was found to generate CD200 mRNA abundantly. However, CD200 expression was barely detected in another C6 glioma cell clone (C6-2) that was previously found to display low tumorigenic behavior. The results from CD200 immunohistochemistry on human glioma tissue array also showed that tumor cells in Grade I-II astrocytoma expressed a lower level of CD200 immunoreactivity than those detected in Grade III-IV glioblastoma multiforme...
December 2016: Journal of Neuroscience Research
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