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MiRNA T lymphocyte

Liang Wei, Vandana Kaul, Xiumei Qu, Xiaoxing Xiong, Audrey H Lau, Naoharu Iwai, Olivia M Martinez, Sheri M Krams
BACKGROUND: MicroRNAs (miRNAs) are small noncoding RNA molecules that regulate the posttranscriptional expression of target genes and are important regulators in immune responses. Previous studies demonstrated that the miRNA, miR-182 was significantly increased during allograft rejection. Further, the transcription factor Forkhead box (FOX) protein 1, (FOXO1) was shown to be a target of miR-182. The aim of this study is to further examine the role of miR-182 in alloimmune responses. METHODS: Transplantation of BALB/c cardiac allografts was performed in C57BL/6, miR-182, B6...
November 23, 2016: Transplantation
Lichuan Yang, XiaoYan Zhang, Wei Peng, Mian Wei, Wei Qin
BACKGROUND: MicroRNA-155 (miR-155) is an important immune regulator of T lymphocyte subgroup balance and function. This study was performed to explore the relationships between miR-155 expression in peripheral blood mononuclear cells (PBMCs), T lymphocyte subgroups, T lymphocyte regulators, and the clinical manifestations of IgA nephropathy (IgAN) patients. METHODS: Sixty biopsy-proven IgAN patients and 25 healthy controls were included in this study. The expression of miRNAs in PBMCs was determined using a microRNA microarray and real-time RT-PCR...
October 31, 2016: International Urology and Nephrology
Silvia Monticelli, Tarmo Äijö, Sara Trifari
MicroRNAs (miRNAs) are crucial components of the molecular networks regulating differentiation and responses of T lymphocytes in health and disease. It is therefore essential to rely on robust methods of qualitative and quantitative investigation of miRNA expression in T cell subsets, and during T cell activation and differentiation. Here, we focus on different methods for miRNA analysis, including Northern blots, quantitative RT-PCR, and next-generation sequencing, and we discuss advantages and disadvantages of each method...
2017: Methods in Molecular Biology
Agata A Filip, Anna Grenda, Sylwia Popek, Dorota Koczkodaj, Małgorzata Michalak-Wojnowska, Michał Budzyński, Ewa Wąsik-Szczepanek, Szymon Zmorzyński, Agnieszka Karczmarczyk, Krzysztof Giannopoulos
Expression of microRNAs is altered in cancer. Circulating miRNA level assessed in body fluids commonly reflects their expression in tumor cells. In leukemias, however, both leukemic and nonleukemic cells compose circulating miRNA expression profile of peripheral blood. The latter contribution to extracellular miRNA pool may result in specific microenvironmental signaling, which promotes proliferation and survival. In our study, we used qT-PCR to assay peripheral blood serum of 22 chronic lymphocytic leukemia (CLL) patients for the expression of 84 miRNAs associated with activation and differentiation of B and T lymphocytes...
October 12, 2016: Annals of Hematology
Zhen Qin, Jing-Jing Wan, Yang Sun, Tingyu Wu, Peng-Yuan Wang, Peng Du, Ding-Feng Su, Yili Yang, Xia Liu
: Although it is generally believed that nicotine accounts for the beneficial effect of smoking on ulcerative colitis, the underlying mechanisms remain not well understood. Our previous finding that nicotine inhibits inflammatory responses through inducing miR-124 prompted us to ask whether the miRNA is involved in the protective action of nicotine against UC. Our present study found that miR-124 expression is upregulated in colon tissues from UC patients and DSS colitis mice. Nicotine treatment further augmented miR-124 expression in lymphocytes isolated from human ulcerative colonic mucosa and ulcerative colon tissues from DSS mice, both in infiltrated lymphocytes and epithelial cells...
October 5, 2016: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
Andreas Brandl, Patrick Daum, Sven Brenner, Sebastian R Schulz, Desmond Yat-Hin Yap, Michael R Bösl, Jürgen Wittmann, Wolfgang Schuh, Hans-Martin Jäck
microRNAs (miRNAs) are important posttranscriptional regulators during hematopoietic lineage commitment and lymphocyte development. Mature miRNAs are processed from primary miRNA transcripts in two steps by the microprocessor complex, consisting of Drosha and its partner DiGeorge Critical Region 8 (DGCR8), and the RNAse III enzyme, Dicer. Conditional ablations of Drosha and Dicer have established the importance of both RNAses in B- and T-cell development. Here, we show that a cre-mediated B-cell specific deletion of DGCR8 in mice results in a nearly complete maturation block at the transition from the pro-B to the pre-B cell stage, and a failure to upregulate Ig μ heavy chain expression in pro-B cells...
October 5, 2016: European Journal of Immunology
Oxana Dobrovinskaya, Georgina Valencia-Cruz, Luis Castro-Sánchez, Edgar O Bonales-Alatorre, Liliana Liñan-Rico, Igor Pottosin
Various types of non-neuronal cells, including tumors, are able to produce acetylcholine (ACh), which acts as an autocrine/paracrine growth factor. T lymphocytes represent a key component of the non-neuronal cholinergic system. T cells-derived ACh is involved in a stimulation of their activation and proliferation, and acts as a regulator of immune response. The aim of the present work was to summarize the data about components of cholinergic machinery in T lymphocytes, with an emphasis on the comparison of healthy and leukemic T cells...
2016: Frontiers in Pharmacology
Florian M Baumann, Yevgeniy Yuzefpolskiy, Surojit Sarkar, Vandana Kalia
MicroRNAs constitute a major post-transcriptional mechanism for controlling protein expression, and are emerging as key regulators during T cell development and function. Recent reports of augmented CD8 T cell activation and effector differentiation, and aberrant migratory properties upon ablation of Dicer/miRNAs in naïve cells have established a regulatory role of miRNAs during priming. Whether miRNAs continue to exert similar functions or are dispensable during later stages of CD8 T cell expansion and memory differentiation remains unclear...
2016: PloS One
Lei Li, Shanshan Wan, Kaixiong Tao, Guobin Wang, Ende Zhao
Killer cell lectin-like receptor subfamily G member 1 (KLRG1) has been found on human memory T lymphocytes. However, the roles of KLRG1 on human T cells especially in tumor microenvironment have not been fully understood. Our results showed KLRG1 expression on T cells significantly increased in tumor microenvironment. KLRG1+ T cells exhibited poor proliferative capacity with decreased effector cytokine production. Meanwhile, KLRG1+ T cells expressed abundant pro-inflammatory cytokines and demonstrated high level of Foxp3 expression...
August 20, 2016: Oncotarget
Khalda Sayed Amr, Faten S Bayoumi, Fatema T Elgengehy, Sanaa O Abdallah, Hanan H Ahmed, Eman Eissa
Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by familial aggregation and genetic predisposition. MicroRNAs (MiRNAs) serve as critical biomarkers in lupus patients because of their aberrant expression in different SLE stages. The study aimed to investigate the correlation of miR-31 and miR-21 with IL-2 in SLE patients as regulatory biomarkers in the activation of T lymphocytes of Egyptian lupus patients. Quantitative RT-PCR is carried out to estimate the expressions of miR-31 and miR-21, and IL-2 levels were determined using ELISA in plasma of 40 patients with SLE, 20 of their first-degree relatives and 20 healthy controls...
November 2016: Rheumatology International
Yi Wang, Keyu Wang, Ningning Dang, Lihua Wang, Min Zhang
Vitiligo is a common established depigmentation skin disease characterized by the presence of activated T lymphocytes anti melanocytes within the skin. T-cell immunity mainly mediates the destruction of melanocytes and is one of the main mechanisms involved in the pathogenesis of non-segmental vitiligo. Our previous study had identified several differentially expressed miRNAs and found that the expression of miR-3940-5p was downregulated in vitiligo patients. According to the research findings, we hypothesized that the novel miRNA plays a potential role on human cutaneous T lymphocytes in the action mechanism of immune imbalance in vitiligo...
July 27, 2016: Immunobiology
N E Corral-Fernández, N Cortez-Espinosa, M Salgado-Bustamante, S Romano-Moreno, S E Medellín-Garibay, M Solis-Rodríguez, B Hernández-Castro, J Macías-Mendoza, R González-Amaro, D P Portales-Pérez
The BCG vaccine induces a Th1 phenotype, which is essential for protection against Mycobacterium tuberculosis. However, the effects of BCG vaccination over time on the T helper subpopulation and the microRNAs involved in adulthood have not been studied. In the present study, we explored the involvement of microRNAs, transcription factors and multifunctional cytokines in BCG vaccination by examining their levels both before and after vaccination of healthy adults. Peripheral blood mononuclear cells were obtained at 0, 2 and 6 months after vaccination...
September 2016: Molecular Immunology
Wei Sang, Cai Sun, Cong Zhang, Dianzheng Zhang, Ying Wang, Linyan Xu, Zhe Zhang, Xiangyu Wei, Bin Pan, Dongmei Yan, Feng Zhu, Zhiling Yan, Jiang Cao, Thomas P Loughran, Kailin Xu
Donor-derived CD4(+) T lymphocytes are the major effector cells directly involved in the development of graft-versus-host disease (GVHD). As a negative regulator of immune cell differentiation and development, microRNA-150 (miR-150) induces immunological tolerance in CD4(+) T cells after transplantation. However, the specific mechanisms have not been fully elucidated. In this study, we demonstrated that miR-150 is capable of not only inhibiting proliferation and activation of CD4(+) T cells but also promoting apoptosis...
August 2016: Cellular Immunology
Caroline Baer, Mario Leonardo Squadrito, Damya Laoui, Danielle Thompson, Sarah K Hansen, Anna Kiialainen, Sabine Hoves, Carola H Ries, Chia-Huey Ooi, Michele De Palma
Tumour-associated macrophages (TAMs) largely express an alternatively activated (or M2) phenotype, which entails immunosuppressive and tumour-promoting capabilities. Reprogramming TAMs towards a classically activated (M1) phenotype may thwart tumour-associated immunosuppression and unleash anti-tumour immunity. Here we show that conditional deletion of the microRNA (miRNA)-processing enzyme DICER in macrophages prompts M1-like TAM programming, characterized by hyperactive IFN-γ/STAT1 signalling. This rewiring abated the immunosuppressive capacity of TAMs and fostered the recruitment of activated cytotoxic T lymphocytes (CTLs) to the tumours...
July 2016: Nature Cell Biology
Jian Lin, Ya T Chen, Jing Xia, Qian Yang
Neuraminidase (NA), a structural protein of the H9N2 avian influenza virus (H9N2 AIV), can facilitate viral invasion of the upper airway by cleaving the sialic acid moieties on mucin. Dendritic cells (DCs) are major antigen-presenting cells whose immune functions, such as presenting antigens and activating lymphocytes, can be regulated by microRNAs. Here, we studied the molecular mechanism of miRNA-induced repression of immune responses in mouse DCs. First, we screened for and verified the miRNAs induced by NA...
June 6, 2016: Oncotarget
Siambi Kikete, Xiaoqian Chu, Li Wang, Yuhong Bian
Dendritic cells (DCs) are potent antigen presenting cells (APCs). They are also specialized in the induction of cytotoxic T lymphocyte mediated responses against extracellular antigens, including tumour-specific antigens, by presenting peptide-Major Histocompatibility Complex (MHC) I complexes to naïve CD8(+) T cells in lymphoid tissues, a process called cross-presentation. Emerging evidence suggests that the efficiency of cross-presentation can be influenced by a unique set of microRNAs (miRNAs). Some are differentially expressed in the course of morphological and functional development of DCs while tumorigenic miRNAs (onco-miRs) can be delivered to and inserted into DCs via exosomes...
December 2016: Cytotechnology
Chien-Hung Yeh, Ramona Moles, Christophe Nicot
Small non-coding microRNAs (miRNAs) are epigenetic regulators that target specific cellular mRNA to modulate gene expression patterns and cellular signaling pathways. miRNAs are involved in a wide range of biological processes and are frequently deregulated in human cancers. Numerous miRNAs promote tumorigenesis and cancer progression by enhancing tumor growth, angiogenesis, invasion and immune evasion, while others have tumor suppressive effects (Hayes, et al., Trends Mol Med 20(8): 460-9, 2014; Stahlhut and Slack, Genome Med 5 (12): 111, 2013)...
2016: Molecular Cancer
Lander Egaña-Gorroño, Alberto C Guardo, Manel E Bargalló, Evarist Planet, Elisenda Vilaplana, Tuixent Escribà, Iñaki Pérez, Josep Maria Gatell, Felipe García, Mireia Arnedo, Montserrat Plana M
BACKGROUND: The relationship between host microRNAs (miRNA), viral control and immune response has not yet been elucidated in the field of HIV. The aim of this study was to assess the differential miRNA profile in CD8+ T-cells between HIV-infected individuals who differ in terms of viral replication control and immune response. METHODS: miRNA profile from resting and CD3/CD28-stimulated CD8+ T-cells from uninfected individuals (HIV-, n = 11), Elite Controllers (EC, n = 15), Viremic Controllers (VC, n = 15), Viremic Progressors (VP, n = 13) and HIV-infected patients on therapy (ART, n = 14) was assessed using Affymetrix miRNA 3...
2016: PloS One
Yijun Zhang, Yue Yin, Shaoying Zhang, Haihua Luo, Hui Zhang
The mechanisms underlying HIV-1-mediated CD4(+) T cell depletion are highly complicated. Interleukin-2 (IL-2) is a key cytokine that maintains the survival and proliferation of activated CD4(+) T cells. IL-2 levels are disturbed during HIV-1 infection, but the underlying mechanism(s) requires further investigation. We have reported that cellular microRNA (miRNA) let-7i upregulates IL-2 expression by targeting the promoter TATA-box region, which functions as a positive regulator. In this study, we found that HIV-1 infection decreases the expression of let-7i in CD4(+) T cells by attenuating its promoter activity...
2016: Scientific Reports
Dawn T Smallwood, Benedetta Apollonio, Shaun Willimott, Larissa Lezina, Afaf Alharthi, Ashley R Ambrose, Giulia De Rossi, Alan G Ramsay, Simon D Wagner
The complex interplay between cancer cells, stromal cells, and immune cells in the tumor microenvironment (TME) regulates tumorigenesis and provides emerging targets for immunotherapies. Crosstalk between CD4(+) T cells and proliferating chronic lymphocytic leukemia (CLL) tumor B cells occurs within lymphoid tissue pseudofollicles, and investigating these interactions is essential to understand both disease pathogenesis and the effects of immunotherapy. Tumor-derived extracellular vesicle (EV) shedding is emerging as an important mode of intercellular communication in the TME...
July 28, 2016: Blood
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