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Treg, immunology

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https://www.readbyqxmd.com/read/28630656/physical-activity-black-carbon-exposure-and-dna-methylation-in-the-foxp3-promoter
#1
Stephanie Lovinsky-Desir, Kyung Hwa Jung, Jacqueline R Jezioro, David Z Torrone, Mariangels de Planell-Saguer, Beizhan Yan, Frederica P Perera, Andrew G Rundle, Matthew S Perzanowski, Steven N Chillrud, Rachel L Miller
BACKGROUND: Physical activity is associated with improvement in lung function; however, pollution exposure during physical activity can lead to a transient reduction in lung function. This paradoxical relationship may be linked to altered T regulatory (Treg) cell activity, which increases with exercise and suppresses airway inflammation, but decreases in association with exposure to air pollution. To clarify these relationships, we investigated buccal cell DNA methylation of the forkhead box p3 (FOXP3) gene promoter, a proposed biomarker of Treg activity...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28620098/cytokine-signaling-in-the-development-and-homeostasis-of-regulatory-t-cells
#2
Kevin H Toomer, Thomas R Malek
Cytokine signaling is indispensable for regulatory T-cell (Treg) development in the thymus, and also influences the homeostasis, phenotypic diversity, and function of Tregs in the periphery. Because Tregs are required for establishment and maintenance of immunological self-tolerance, investigating the role of cytokines in Treg biology carries therapeutic potential in the context of autoimmune disease. This review discusses the potent and diverse influences of interleukin (IL)-2 signaling on the Treg compartment, an area of knowledge that has led to the use of low-dose IL-2 as a therapy to reregulate autoaggressive immune responses...
June 15, 2017: Cold Spring Harbor Perspectives in Biology
https://www.readbyqxmd.com/read/28620093/increased-interleukin-35-levels-in-patients-with-type-1-diabetes-with-remaining-c-peptide
#3
Daniel Espes, Kailash Singh, Stellan Sandler, Per-Ola Carlsson
OBJECTIVE: Many patients with long-standing type 1 diabetes have remaining functional β-cells. This study investigated immunological differences between patients with or without measurable remaining endogenous insulin production after ≥10 years duration of disease. RESEARCH DESIGN AND METHODS: Patients (n = 113; ≥18 years of age) with type 1 diabetes and with disease duration of ≥10 years were recruited at Uppsala University Hospital. Residual β-cell function was determined with an ultrasensitive C-peptide ELISA...
June 15, 2017: Diabetes Care
https://www.readbyqxmd.com/read/28611475/murine-lrba-deficiency-causes-ctla-4-deficiency-in-tregs-without-progression-to-immune-dysregulation
#4
Deborah Burnett, Ian Parish, Etienne Masle-Farquhar, Robert Brink, Christopher Goodnow
Inherited mutations in Lipopolysaccharide Responsive Beige-like Anchor (LRBA) cause a recessive human immune dysregulation syndrome with memory B cell and antibody deficiency (common variable immunodeficiency, CVID), inflammatory bowel disease, enlarged spleen and lymph nodes, accumulation of activated T cells, and multiple autoimmune diseases. To understand the pathogenesis of the syndrome, C57BL/6 mice carrying a homozygous truncating mutation in Lrba were produced using CRISPR/Cas9-mediated gene targeting...
June 14, 2017: Immunology and Cell Biology
https://www.readbyqxmd.com/read/28611472/cd11a-icam-1-blockade-combined-with-il-2-targeting-therapy-causes-a-paradoxical-acceleration-of-type-1-diabetes
#5
Ekua W Brenu, Timothy J Bartley, Casey M Wright, Emma Hamilton-Williams
Enhancement of regulatory T cell (Treg) function is the goal of many immunotherapies aimed at treating type 1 diabetes (T1D). The use of IL-2 is hindered by its effects on other populations such as effector T cells and NK cells. Combination therapies aimed at suppressing effector T cells while using IL-2 to expand Tregs could be beneficial and have been trialed in T1D patients. We have investigated a combination therapy using IL-2 and αCD11a blocking antibody to simultaneously expand Tregs and suppress the activation and migration of autoreactive T cells...
June 14, 2017: Immunology and Cell Biology
https://www.readbyqxmd.com/read/28608637/regulatory-t-cell-therapy-in-liver-transplantation
#6
REVIEW
Gavin P Whitehouse, Andrew Hope, Alberto Sanchez-Fueyo
Modern immunosuppression drug regimens have produced excellent short term survival after liver transplantation but it is generally accepted that the side effects of these medications remain a significant contributing factor for less satisfactory long term outcomes. The liver has unique tolerogenic properties as evidenced by the higher rates of operational tolerance seen in liver transplant recipients compared to other solid organ transplants and therefore liver transplantation offers an attractive setting in which to study tolerising therapies...
June 13, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/28607488/stability-and-function-of-regulatory-t-cells-expressing-the-transcription-factor-t-bet
#7
Andrew G Levine, Alejandra Medoza, Saskia Hemmers, Bruno Moltedo, Rachel E Niec, Michail Schizas, Beatrice E Hoyos, Ekaterina V Putintseva, Ashutosh Chaudhry, Stanislav Dikiy, Sho Fujisawa, Dmitriy M Chudakov, Piper M Treuting, Alexander Y Rudensky
Adaptive immune responses are tailored to different types of pathogens through differentiation of naive CD4 T cells into functionally distinct subsets of effector T cells (T helper 1 (TH1), TH2, and TH17) defined by expression of the key transcription factors T-bet, GATA3, and RORγt, respectively. Regulatory T (Treg) cells comprise a distinct anti-inflammatory lineage specified by the X-linked transcription factor Foxp3 (refs 2, 3). Paradoxically, some activated Treg cells express the aforementioned effector CD4 T cell transcription factors, which have been suggested to provide Treg cells with enhanced suppressive capacity...
June 15, 2017: Nature
https://www.readbyqxmd.com/read/28605137/peripheral-immunophenotyping-identifies-three-subgroups-based-on-t-cell-heterogeneity-in-lupus-patients
#8
Satoshi Kubo, Shingo Nakayamada, Maiko Yoshikawa, Yusuke Miyazaki, Kei Sakata, Kazuhisa Nakano, Kentaro Hanami, Shigeru Iwata, Ippei Miyagawa, Kazuyoshi Saito, Yoshiya Tanaka
OBJECTIVE: To elucidate the diversity of systemic lupus erythematosus (SLE), we stratified active SLE patients based on immunophenotyping. METHODS: Peripheral blood mononuclear cells were obtained from 143 SLE patients and 49 healthy individuals. Circulating B, T and dendritic cells were defined based on flow cytometric analysis for human immune system termed "the Human Immunology Project". Based on these results, the immunophenotype was visualized by principal component analysis and SLE patients classified into subgroups by cluster analysis...
June 12, 2017: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/28591041/relationship-of-treg-th17-balance-with-hbeag-change-in-hbeag-positive-chronic-hepatitis-b-patients-receiving-telbivudine-antiviral-treatment-a-longitudinal-observational-study
#9
Xiaoling Yang, Jia Li, Jie Liu, Min Gao, Li Zhou, Wei Lu
Telbivudine (LdT) is an orally L-nucleoside with potent and specific antihepatitis B virus (HBV) activity. The higher rate of hepatitis B e antigen (HBeAg) seroconversion of LdT treatment than other anti-HBV agents suggests a potential immunomodulatory effect. The aim of the study was to investigate the changes of regulatory T cell (Treg)/interleukin (IL)-17-producing CD4+T helper (Th17) balance during LdT treatment and to discuss the relationship of Treg/Th17 balance with HBeAg change in HBeAg-positive chronic hepatitis B (CHB) patients receiving LdT antiviral treatment...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28591035/a-case-report-of-lymphoid-intestitial-pneumonia-in-common-variable-immunodeficiency-oligoclonal-expansion-of-effector-lymphocytes-with-preferential-cytomegalovirus-specific-immune-response-and-lymphoproliferative-disease-promotion
#10
Przemyslaw Zdziarski, Andrzej Gamian, Grzegorz Dworacki
RATIONALE: Lymphoid interstitial pneumonia (LIP) is a rare disease with lymphocytic infiltration of the alveolar interstitial and air spaces, sometimes classified as a clonal lymphoproliferative disease (LPD) with high prevalence in patients with immunodysregulation. Although association of mucosa-associated lymphoid tissue (MALT) lymphoma development with infectious agents has been well described, it is not so in the case of LIP. Attempts to demonstrate an infective cause by direct microbe detection have failed, but association with atypical specific immune response to opportunistic infectious agent has not been studied...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28559274/a-lower-baseline-cd4-cd8-t-cell-ratio-is-independently-associated-with-immunodiscordant-response-to-antiretroviral-therapy-in-hiv-infected-subjects
#11
I Rosado-Sánchez, I Herrero-Fernández, A I Álvarez-Ríos, M Genebat, M A Abad-Carrillo, E Ruiz-Mateos, F Pulido, J González-García, M Montero, E Bernal-Morell, F Vidal, M Leal, Y M Pacheco
We explored if baseline CD4/CD8 T-cell ratio is associated with immunodiscordant response to antiretroviral therapy in HIV-infected subjects. Comparing immunodiscordant and immunoconcordant subjects matched by pre-treatment CD4 counts, we observed a lower pre-treatment CD4/CD8 T-cell ratio in immunodiscordant subjects. Furthermore, pre-treatment CD4/CD8 T-cell ratio, but not CD4 counts, correlated with main immunological alterations observed in immunodiscordants, including increased Treg frequency and T-cell turnover-related markers...
May 30, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28556921/membrane-bound-dickkopf-1-in-foxp3-regulatory-t-cells-suppresses-t-cell-mediated-autoimmune-colitis
#12
Wook-Jin Chae, Jong-Hyun Park, Octavian Henegariu, Saliha Yilmaz, Liming Hao, Alfred L M Bothwell
Induction of tolerance is a key mechanism to maintain or to restore immunological homeostasis. Here we show that Foxp3(+) regulatory T cells (Treg cells) utilize Dickkopf-1 (DKK-1) to regulate T cell-mediated tolerance in the T cell-mediated autoimmune colitis model. Treg cells from DKK-1 hypomorphic doubleridge mice failed to control CD4(+) T cell proliferation, resulting in CD4 T-cell-mediated autoimmune colitis. Thymic-derived Treg cells showed a robust expression of DKK-1 but not in naïve or effector CD4 T cells...
May 30, 2017: Immunology
https://www.readbyqxmd.com/read/28543637/evidence-of-the-immunomodulatory-role-of-dual-pi3k-mtor-inhibitors-in-graft-survival
#13
Valery Vilchez, Lilia Turcios, D Allan Butterfield, Mihail I Mitov, Cristin L Coquillard, Anthony J Brandon, Virgilius Cornea, Roberto Gedaly, Francesc Marti
The PI3K/mTOR signaling cascade is fundamental in T-cell activation and fate decisions. We showed the distinct regulation of PI3K/mTOR in regulatory and effector T-cells and proposed the potential therapeutic benefit of targeting this pathway to control the balance between effector and regulatory T-cell activities. Substantial adverse effects in long-term clinical usage of Rapamycin suggest the use of alternative treatments in restraining effector T-cell function in transplant patients. We hypothesize that dual PI3K/mTOR inhibitors may represent an immunosuppressant alternative...
May 24, 2017: Transplant International: Official Journal of the European Society for Organ Transplantation
https://www.readbyqxmd.com/read/28536366/advances-in-the-use-of-regulatory-t-cells-for-the-prevention-and-therapy-of-graft-vs-host-disease
#14
REVIEW
Reshma Ramlal, Gerhard C Hildebrandt
Regulatory T (Tregs) cells play a crucial role in immunoregulation and promotion of immunological tolerance. Adoptive transfer of these cells has therefore been of interest in the field of bone marrow and solid organ transplantation, autoimmune diseases and allergy medicine. In bone marrow transplantation, Tregs play a pivotal role in the prevention of graft-verus-host disease (GvHD). This has generated interest in using adoptive Treg cellular therapy in the prevention and treatment of GvHD. There have been several barriers to the feasibility of Treg cellular therapy in the setting of hematopoietic stem cell transplantation (HSCT) which include low Treg concentration in peripheral blood, requiring expansion of the Treg population; instability of the expanded product with loss of FoxP3 expression; and issues related to the purity of the expanded product...
May 16, 2017: Biomedicines
https://www.readbyqxmd.com/read/28521429/b-cells-inhibit-the-antitumor-immunity-against-an-established-murine-fibrosarcoma
#15
Andrea Maglioco, Damián G Machuca, María Noel Badano, Paula Nannini, Gabriela V Camerano, Héctor Costa, Roberto Meiss, Raúl A Ruggiero, Mirta Giordano, Graciela I Dran
Despite the classic role of B cells in favoring the immune response, an inhibitory action of B lymphocytes in tumor immunity has emerged in certain studies. In methylcolanthrene-induced murine fibrosarcoma (MCC), the loss of immunogenicity and the establishment of tolerance are paralleled by systemic immune suppression and the appearance of B(+)IL-10(+) cells in tumor-draining lymph nodes. The present study aimed to assess the role of the B(+)IL-10(+) cell population in the immune evasion and tolerance induced by MCC through the depletion of B cells in mice at various times of tumor progression: Prior to or subsequent to tumor implantation...
May 2017: Oncology Letters
https://www.readbyqxmd.com/read/28501670/treg-recruiting-microspheres-prevent-inflammation-in-a-murine-model-of-dry-eye-disease
#16
Michelle L Ratay, Andrew J Glowacki, Stephen C Balmert, Abhinav P Acharya, Julia Polat, Lawrence P Andrews, Morgan V Fedorchak, Joel S Schuman, Dario A A Vignali, Steven R Little
Dry eye disease (DED) is a common ocular disorder affecting millions of individuals worldwide. The pathology of DED involves the infiltration of CD4(+) lymphocytes, leading to tear film instability and destructive inflammation. In the healthy steady state, a population of immunosuppressive T-cells called regulatory T-cells (Treg) regulates proliferation of immune cells that would otherwise lead to a disruption of immunological homeostasis. For this reason, it has been suggested that Tregs could restore the immunological imbalance in DED...
May 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28501128/immunochemotherapy-benefits-in-gastric-cancer-patients-stratified-by-programmed-death-1-ligand-1
#17
Jun-Te Hsu, Chih-Sin Hsu, Puo-Hsien Le, Tse-Ching Chen, Wen-Chi Chou, Chun-Yen Lin, Ta-Sen Yeh
BACKGROUND: Effectiveness of protein-bound polysaccharide K (PSK) during adjuvant chemotherapy in gastric cancer patients expressing programmed death-1 ligand 1 (PD-L1) has not been investigated. Investigating this might help in triaging candidates eligible to immunochemotherapy. MATERIALS AND METHODS: In total, 918 patients with stages II and III gastric cancer, undergoing curative gastrectomy, and receiving adjuvant chemotherapy were enrolled in a prospective database, and the patients were retrospectively reviewed...
May 1, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28500763/cross-talk-between-enzymes-matrix-metalloproteinsese-2-and-9-and-regulatory-t-cell-immunity-in-the-global-burden-of-atherosclerosis
#18
Andrica Lekic, Zdrinko Brekalo, Ante Kvesic, Miljenko Kovacevic, Zdenka Baricev-Novakovic, Ivana Sutic, Aleksandar Bulog, Ingrid Sutic, Valentino Pavisic, Ines Mrakovcic-Sutić
Changes in immune and inflammatory responses may play a crucial role in the development and progression of atherosclerosis, as an autoimmune, chronic and progressive inflammatory disease. Immunological activity and vascular inflammation during atherosclerosis can be modulated by autoimmune responses against self-antigens, according to changeable risk factors (cholesterol, oxidized low-density lipoprotein (ox-LDL) in the vascular wall, fatty acids, etc.) and accompanied by accumulation of leucocytes and proinflammatory cytokines, which stimulate the transcription of matrix-metalloproteinases (MMPs), whose concentration are increased in foam cell rich regions...
May 13, 2017: Scandinavian Journal of Immunology
https://www.readbyqxmd.com/read/28498408/induction-of-il-17-production-from-human-peripheral-blood-cd4-cells-by-asbestos-exposure
#19
Megumi Maeda, Ying Chen, Suni Lee, Naoko Kumagai-Takei, Kei Yoshitome, Hidenori Matsuzaki, Shoko Yamamoto, Tamayo Hatayama, Miho Ikeda, Yasumitsu Nishimura, Takemi Otsuki
We have previously reported that chronic, recurrent and low-dose exposure to asbestos fibers causes a reduction in antitumor immunity. Investigation of natural killer (NK) cells using an in vitro cell line model and comprising in vitro activation using freshly isolated NK cells co-cultured with chrysotile fibers, as well as NK cells derived from asbestos-exposed patients with pleural plaque (PP) or malignant mesothelioma (MM), revealed decreased expression of NK cell activating receptors such as NKG2D, 2B4 and NKp46...
May 9, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28488961/effect-of-storage-period-of-red-blood-cell-suspensions-on-helper-t-cell-subpopulations
#20
Salih H Bal, Yasemin Heper, Levent T Kumaş, Furkan Guvenc, Ferah Budak, Güher Göral, Haluk B Oral
BACKGROUND: The aim of this study was to investigate the immunological alterations that occur during the storage of erythrocyte suspensions which may lead to transfusion-related immunomodulation following allogeneic blood transfusion. MATERIALS AND METHODS: One part of the erythrocyte suspensions obtained from donors was leucoreduced while the other part was not. The leucoreduced (LR) and non-leucoreduced (NL) erythrocyte suspensions were then further divided into three equal amounts which were stored for 0, 21 or 42 days prior to measurements, by enzyme-linked immunosorbent assays, of cytokine levels in their supernatants...
March 15, 2017: Blood Transfusion, Trasfusione del Sangue
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