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https://www.readbyqxmd.com/read/28340094/nlrp2-is-a-suppressor-of-nf-%C3%A6-b-signaling-and-hla-c-expression-in-human-trophoblasts
#1
Tamara Tilburgs, Torsten B Meissner, Leonardo M R Ferreira, Arend Mulder, Kiran Musunuru, Junqiang Ye, Jack L Strominger
During human pregnancy, fetal extravillous trophoblasts (EVT) play a key role in the regulation of maternal T cell and NK cell responses. EVT display a unique combination of Human Leukocyte Antigens (HLA); EVT do not express HLA-A and HLA-B, but do express HLA-C, HLA-E and HLA-G. The mechanisms establishing this unique HLA expression pattern have not been fully elucidated. The MHC class I and class II transcriptional activators NLRC5 and CIITA are expressed neither by EVT nor by the EVT model cell line JEG3, which has an MHC expression pattern identical to that of EVT...
March 7, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28303134/bronchial-epithelial-cells-from-asthmatic-patients-display-less-functional-hla-g-isoform-expression
#2
Federico Carlini, Christophe Picard, Céline Garulli, David Piquemal, Pierre Roubertoux, Jacques Chiaroni, Pascal Chanez, Delphine Gras, Julie Di Cristofaro
Not all asthmatic patients adequately respond to current available treatments, such as inhaled corticosteroids or omalizumab(®). New treatments will aim to target the bronchial epithelium-immune response interaction using different pathways. HLA-G is involved in immunomodulation and may promote epithelial cell differentiation and proliferation. HLA-G protein has several isoforms generated by alternative splicing that might have differential functionalities. HLA-G protein expression and genetic polymorphisms have been reported to be associated with asthma...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28287635/efficient-production-of-trophoblast-lineage-cells-from-human-induced-pluripotent-stem-cells
#3
Junya Kojima, Atsushi Fukuda, Hayato Taira, Tomoyuki Kawasaki, Hiroe Ito, Naoaki Kuji, Keiichi Isaka, Akihiro Umezawa, Hidenori Akutsu
Human induced pluripotent stem cells (hiPSCs) are potentially useful in both clinical applications and basic biological research. hiPSCs can differentiate into extra-embryonic cells in the presence of BMP4. However, the differentiation potential of hiPSCs can be affected by culture conditions or genetic variation. In this study, we investigated the effect of various BMP4 concentrations on the expression states of trophoblast markers and the optimal conditions for trophoblast induction. A high-fidelity gene expression assay using hiPSC lines showed that the expression levels of various trophoblast marker genes, such as KRT7, GCM1, CGB, and HLA-G, were upregulated by BMP4 in a dose-dependent manner in all types of hiPSCs used in this study...
March 13, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28279591/hla-g-at-the-interface-of-maternal-fetal-tolerance
#4
REVIEW
Leonardo M R Ferreira, Torsten B Meissner, Tamara Tilburgs, Jack L Strominger
During pregnancy, semiallogeneic fetal extravillous trophoblasts (EVT) invade the uterine mucosa without being rejected by the maternal immune system. Several mechanisms were initially proposed by Peter Medawar half a century ago to explain this apparent violation of the laws of transplantation. Then, three decades ago, an unusual human leukocyte antigen (HLA) molecule was identified: HLA-G. Uniquely expressed in EVT, HLA-G has since become the center of the present understanding of fetus-induced immune tolerance...
March 6, 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28274545/tumour-and-placenta-establishment-the-importance-of-antigen-processing-and-presentation
#5
Emma Reeves, Edward James
Classical and non-classical MHC class I (MHC I) molecules displayed at the cell surface are essential for the induction of innate and adaptive immune responses. Classical MHC I present endogenously derived peptides to CD8(+) T cells for immunosurveillance of infected or malignant cells. By contrast, non-classical MHC I, in particular HLA-G, also display peptides, but primarily act as immunomodulatory ligands for the innate immune response and are an important component for extravillous trophoblast invasion to form the placenta in pregnancy...
February 28, 2017: Placenta
https://www.readbyqxmd.com/read/28267635/associations-between-fetal-hla-g-genotype-and-birth-weight-and-placental-weight-in-a-large-cohort-of-pregnant-women-possible-implications-for-hla-diversity
#6
Johanne Emmery, Ole B Christiansen, Line Lynge Nilsson, Mette Dahl, Peter Skovbo, Anna Margrethe Møller, Rudi Steffensen, Thomas Vauvert F Hviid
Birth weight and placental weight are crucial parameters for the survival of fetuses and newborns in mammals. High variation in the MHC is important for an effective adaptive immune response. The maternal immune system must be controlled in relation to the semi-allogenic fetus. The immunoregulatory HLA/MHC class Ib gene, HLA-G, is strongly expressed on extravillous trophoblast cells. We investigated birth weight and placental weight of the newborns in mothers heterozygous for an HLA-G 14bp insertion (Ins)/deletion (Del) gene polymorphism...
February 20, 2017: Journal of Reproductive Immunology
https://www.readbyqxmd.com/read/28262752/highly-exposed-hiv-1-seronegative-female-commercial-sex-workers-sustain-in-their-genital-mucosa-increased-frequencies-of-tolerogenic-myeloid-and-regulatory-t-cells
#7
V Thibodeau, L Fourcade, A-C Labbé, M Alary, F Guédou, J Poudrier, M Roger
We and others have shown that HIV-1 highly-exposed seronegative (HESN) female commercial sex workers (CSWs) maintain low genital inflammatory conditions to prevent HIV infection. HIV-1 interacts with toll-like receptors (TLR)-7/8 to induce interferon (IFN)-α, an important antiviral and immunomodulatory cytokine, which act together with interleukin (IL)-10, human leukocyte antigen (HLA)-G and immunoglobulin-like transcript (ILT)-4 to initiate a "tolerogenic/regulatory" anti-inflammatory loop. In view of further unravelling elements associated with natural immunity to HIV-1, we have characterised TLR-7, IFN-α, IL-10, HLA-G and ILT-4 expression profiles in the genital tract of female CSWs and HIV-1-uninfected non-CSWs from Benin...
March 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28229263/exosomes-derived-from-human-amniotic-epithelial-cells-accelerate-wound-healing-and-inhibit-scar-formation
#8
Bin Zhao, Yijie Zhang, Shichao Han, Wei Zhang, Qin Zhou, Hao Guan, Jiaqi Liu, Jihong Shi, Linlin Su, Dahai Hu
Wound healing is a highly orchestrated physiological process consisting of a complex events, and scarless wound healing is highly desired for the development and application in clinical medicine. Recently, we have demonstrated that human amniotic epithelial cells (hAECs) promoted wound healing and inhibited scar formation through a paracrine mechanism. However, exosomes (Exo) are one of the most important paracrine factors. Whether exosomes derived from human amniotic epithelial cells (hAECs-Exo) have positive effects on scarless wound healing have not been reported yet...
April 2017: Journal of Molecular Histology
https://www.readbyqxmd.com/read/28197367/targeting-ewing-sarcoma-with-activated-and-gd2-specific-chimeric-antigen-receptor-engineered-human-nk-cells-induces-upregulation-of-immune-inhibitory-hla-g
#9
Sareetha Kailayangiri, Bianca Altvater, Christian Spurny, Silke Jamitzky, Sonja Schelhaas, Andreas H Jacobs, Constanze Wiek, Katharina Roellecke, Helmut Hanenberg, Wolfgang Hartmann, Heinz Wiendl, Susann Pankratz, Jutta Meltzer, Nicole Farwick, Lea Greune, Maike Fluegge, Claudia Rossig
Activated and in vitro expanded natural killer (NK) cells have substantial cytotoxicity against many tumor cells, but their in vivo efficacy to eliminate solid cancers is limited. Here, we used chimeric antigen receptors (CARs) to enhance the activity of NK cells against Ewing sarcomas (EwS) in a tumor antigen-specific manner. Expression of CARs directed against the ganglioside antigen GD2 in activated NK cells increased their responses to GD2+ allogeneic EwS cells in vitro and overcame resistance of individual cell lines to NK cell lysis...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28185362/definitive-class-i-human-leukocyte-antigen-expression-in-gestational-placentation-hla-f-hla-e-hla-c-and-hla-g-in-extravillous-trophoblast-invasion-on-placentation-pregnancy-and-parturition
#10
Rinat Hackmon, Lakmini Pinnaduwage, Jianhong Zhang, Stephen J Lye, Daniel E Geraghty, Caroline E Dunk
PROBLEM: The extravillous trophoblasts (EVT) express HLA-C and HLA-G, but HLA-E and HLA-F are the subject of conflicting reports. In this study, we define the HLA expression profile during active EVT placental implantation, pregnancy development, and parturition. METHOD OF STUDY: Immunohistochemistry, q-PCR, and Western blot were used to investigate HLA-C, HLA-E, and HLA-F placental expression across gestation from the early first trimester, late first trimester, second trimester (n=10 in each), preterm gestation (n=6) to elective term cesarean section and term vaginal deliveries (n=12, 38-41 weeks)...
February 10, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/28166246/soluble-human-leukocyte-antigen-g-during-pregnancy-and-infancy-in-benin-mother-child-resemblance-and-association-with-the-risk-of-malaria-infection-and-low-birth-weight
#11
Tania C d'Almeida, Ibrahim Sadissou, Jacqueline Milet, Gilles Cottrell, Amandine Mondière, Euripide Avokpaho, Laure Gineau, Audrey Sabbagh, Achille Massougbodji, Kabirou Moutairou, Eduardo A Donadi, Benoit Favier, Edgardo Carosella, Philippe Moreau, Nathalie Rouas-Freiss, David Courtin, André Garcia
Human leukocyte antigen (HLA) G is a tolerogenic molecule involved in the maternal-fetal immune tolerance phenomenon. Its expression during some infectious diseases leading to immune evasion has been established. A first study conducted in Benin has shown that the production of soluble HLA-G (sHLA-G) during the first months of life is strongly correlated with the maternal level at delivery and associated with low birth weight and malaria. However sHLA-G measurements during pregnancy were not available for mothers and furthermore, to date the evolution of sHLA-G in pregnancy is not documented in African populations...
2017: PloS One
https://www.readbyqxmd.com/read/28162915/simple-in-vitro-generation-of-human-leukocyte-antigen-g-expressing-t-regulatory-cells-through-pharmacological-hypomethylation-for-adoptive-cellular-immunotherapy-against-graft-versus-host-disease
#12
Panagiota Stamou, Dimitra Marioli, Alexandra L Patmanidi, Argyro Sgourou, Angeliki Vittoraki, Efthymia Theofani, Chryso Pierides, Stavros Taraviras, Paul A Costeas, Alexandros Spyridonidis
BACKGROUND: Major barriers in using classical FOXP3+ regulatory T cells (Tregs) in clinical practice are their low numbers in the circulation, the lack of specific cell surface markers for efficient purification and the loss of expression of Treg signature molecules and suppressive function after in vitro expansion or in a pro-inflammatory microenviroment. A surface molecule with potent immunosuppressive function is the human leukocyte antigen-G (HLA-G), which is normally expressed in placenta protecting the "semi-allogeneic" fetus from maternal immune attack...
February 2, 2017: Cytotherapy
https://www.readbyqxmd.com/read/28159587/evaluation-of-hla-g-hla-e-and-pd-l1-proteins-in-oral-osteosarcomas
#13
Diego Antonio Costa Arantes, Andréia Souza Gonçalves, Bruno Correia Jham, Eliza Carla Barroso Duarte, Élbio Candido de Paula, Henrique Moura de Paula, Elismauro Francisco Mendonça, Aline Carvalho Batista
OBJECTIVE: The aim of this study was to investigate the expression of human leukocyte antigens (HLAs) G and E and programmed death-ligand 1 (PD-L1) in oral osteosarcoma (OO) (n = 13). The relationship between the expression of these molecules and histologic grading and metastasis was also evaluated. STUDY DESIGN: HLA-G, HLA-E, and PD-L1 were identified by immunohistochemistry. Samples of normal bone tissue (n = 6) were used as controls. The sections were evaluated using a semiquantitative scoring system with an immunoreactive score, where a score of 0 was considered absent, ≤2 was low, and >2 was high expression...
December 14, 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28143491/-hla-g-3-utr-gene-polymorphisms-and-rheumatic-heart-disease-a-familial-study-among-south-indian-population
#14
Maheshkumar Poomarimuthu, Sivakumar Elango, Sambath Soundrapandian, Jayalakshmi Mariakuttikan
BACKGROUND: Rheumatic heart disease (RHD) is an autoimmune disease where cross reactive CD4(+) T cells are involved in the pathogenesis of valvular damage. Human Leukocyte Antigen-G (HLA-G), an immunosuppressive molecule playing a crucial role in the inhibition of T cell response is associated with the pathogenesis of various autoimmune and inflammatory diseases. Genetic polymorphisms within the 3'untranslated region (UTR) of HLA-G influences its expression and thus disease pathogenesis...
February 1, 2017: Pediatric Rheumatology Online Journal
https://www.readbyqxmd.com/read/28135606/hla-g-variability-and-haplotypes-detected-by-massively-parallel-sequencing-procedures-in-the-geographicaly-distinct-population-samples-of-brazil-and-cyprus
#15
Erick C Castelli, Petroula Gerasimou, Michelle A Paz, Jaqueline Ramalho, Iane O P Porto, Thálitta H A Lima, Andréia S Souza, Luciana C Veiga-Castelli, Cristhianna V A Collares, Eduardo A Donadi, Celso T Mendes-Junior, Paul Costeas
The HLA-G molecule presents immunomodulatory properties that might inhibit immune responses when interacting with specific Natural Killer and T cell receptors, such as KIR2DL4, ILT2 and ILT4. Thus, HLA-G might influence the outcome of situations in which fine immune system modulation is required, such as autoimmune diseases, transplants, cancer and pregnancy. The majority of the studies regarding the HLA-G gene variability so far was restricted to a specific gene segment (i.e., promoter, coding or 3' untranslated region), and was performed by using Sanger sequencing and probabilistic models to infer haplotypes...
March 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28131957/the-role-of-methylation-dna-polymorphisms-and-micrornas-on-hla-g-expression-in-human-embryonic-stem-cells
#16
A Verloes, C Spits, M Vercammen, M Geens, J LeMaoult, K Sermon, W Coucke, H Van de Velde
The human leukocyte antigen (HLA)-G gene seems to play a pivotal role in maternal tolerance to the fetus. Little is known about HLA-G expression and its molecular control during in vivo human embryogenesis. Human embryonic stem cells (hESC) provide an interesting in vitro model to study early human development. Different studies reported discrepant findings on whether HLA-G mRNA and protein are present or absent in hESC. Several lines of evidence indicate that promoter CpG methylation and 3' untranslated region (3'UTR) polymorphisms may influence HLA-G expression...
March 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28129605/mesenchymal-stem-cells-upregulate-treg-cells-via-shla-g-in-sle-patients
#17
Chen Chen, Jun Liang, Genhong Yao, Haifeng Chen, Bingyu Shi, Zhuoya Zhang, Cheng Zhao, Huayong Zhang, Lingyun Sun
BACKGROUND: Soluble human leukocyte antigen-G (sHLA-G) is a non-classical HLA class I molecule, exhibiting strong immunosuppressive properties by inducing the differentiation of T regulatory cells (Treg). Mesenchymal stem cells (MSCs) transplantation alleviates disease progression in systemic lupus erythematosus (SLE) patients. However, the underlying mechanisms are largely unknown. OBJECTIVES: To explore whether sHLA-G is involved in upregulating effects of MSCs on Treg, which contributes to therapeutic effects of MSCs transplantation in SLE...
January 24, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28088953/-research-of-mhla-g-and-the-receptor-expression-with-kidney-rejection-and-cmv-active-infection-following-kidney-transplantation
#18
L L Bi, Y Gao, Y J Sun, X R Kong, X Y He, X H Ma, W H Zhang, L Xiao, B Y Shi
Objective: To study the expression of membrane HLA-G (mHLA-G) and the receptor immunoglobulin-like transcript 2(ILT2) on lymphocyte and find their association with rejection and cytomegalovirus (CMV) infection after renal transplantation. Methods: A total of 88 cases of renal transplant recipients for the first time from February 2014 to February 2016 were studied in this work. Recipients can be divided into rejection group (n=12) and stable renal function group (n=41) according to whether rejection occurred...
January 10, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28052009/cancer-associated-fibroblasts-promote-an-immunosuppressive-microenvironment-through-the-induction-and-accumulation-of-protumoral-macrophages
#19
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/28045999/haplotypes-of-the-hla-g-3-untranslated-region-respond-to-endogenous-factors-of-hla-g-and-hla-g-cell-lines-differentially
#20
Isabelle Poras, Layale Yaghi, Gustavo Martelli-Palomino, Celso T Mendes-Junior, Yara Costa Netto Muniz, Natalia F Cagnin, Bibiana Sgorla de Almeida, Erick C Castelli, Edgardo D Carosella, Eduardo A Donadi, Philippe Moreau
The immune checkpoint HLA-G prevents maternal rejection of the fetus and contributes in cancer invasion and acceptance of allografts. The 5' and 3' regulatory regions of the HLA-G gene are polymorphic and balancing selection probably maintains this variability. It is proposed that nucleotide variations may affect the level of HLA-G expression. To investigate this issue we aimed to analyze how haplotypes of the 3' untranslated region (3'UTR) with highest worldwide frequencies, namely UTR-1, UTR-2, UTR-3, UTR-4, UTR-5, UTR-18 and UTR-7, impact the expression of a luciferase reporter gene in vitro...
2017: PloS One
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