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Regulatory t cells

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https://www.readbyqxmd.com/read/29454004/identification-and-analysis-of-peanut-specific-t-effector-and-t-regulatory-cells-in-children-allergic-and-tolerant-to-peanut
#1
Katherine A Weissler, Marjohn Rasooly, Tom DiMaggio, Hyejeong Bolan, Daly Cantave, David Martino, Melanie R Neeland, Mimi Lk Tang, Thanh D Dang, Katrina J Allen, Pamela A Frischmeyer-Guerrerio
BACKGROUND: Peanut allergy is potentially life-threatening and generally persists lifelong. Recent data suggests the skin may be an important route of initial sensitization to peanut, while early oral exposure to peanut is protective. In mice, T regulatory cells (Tregs) are central to development of tolerance to food, but their contribution to the pathogenesis of food allergy in humans is less clear. OBJECTIVE: We sought to quantify and phenotype peanut-specific CD4+ T effector (ps-Teff) and ps-Tregs in children with and without peanut allergy or sensitization...
February 14, 2018: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29453928/cd4-cd25-cd127low-foxp3-regulatory-t-cells-in-crohn-s-disease
#2
Ali Khalili, Soheil Ebrahimpour, Iradj Maleki, Saeid Abediankenari, Mousa Mohammadnia Afrouzi
BACKGROUND: Regulatory T (Treg) cell play a key role in autoimmune diseases. We evaluated the regulatory function and frequency of Treg cells and secreted IL-10, IL-35 concentration in Crohn's disease (CD). METHODS: Twenty-three patients with CD and 25 healthy controls (HC) were included in this study. We analysed the alteration of Tregs frequency using flow cytometry for CD4, CD25, CD127 and FoxP3 markers. Surface expression of CD4, CD25 and CD127 markers were used for isolation of a relatively pure Treg cells...
February 16, 2018: Romanian Journal of Internal Medicine, Revue Roumaine de Médecine Interne
https://www.readbyqxmd.com/read/29453746/effect-of-aerobic-exercise-on-treg-and-th17-of-rats-with-ischemic-cardiomyopathy
#3
Zhisong Chen, Wenwen Yan, Yu Mao, Yi Ni, Lin Zhou, Haoming Song, Wenjun Xu, Leming Wang, Yuqin Shen
Immune activation and inflammation participate in the progression of chronic heart failure (CHF). Th17 cells and CD4+CD25+ regulatory T (Treg) cells both come from naive Th cells and share reciprocal development pathways but exhibit opposite effects. We hypothesized that the Th17/Treg balance was impaired in patients with CHF, and exercise can improve it. Rats with ischemic cardiomyopathy were prepared by ligaturing the left anterior descending branch of the left coronary artery. Rats in training group were trained with treadmill; Th17 cells increased significantly while Treg cells significantly decreased in s by flow cytometry, and the peripheral blood level of IL-6, IL-17, and TNF-α was obviously elevated by ELISA assay...
February 16, 2018: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/29453607/semaphorin-7a-in-circulating-regulatory-t-cells-is-increased-in-autosomal-dominant-polycystic-kidney-disease-and-decreases-with-tolvaptan-treatment
#4
Yashang Lee, Katrina Lehmann Blount, Feng Dai, Siobhan Thompson, Jonathan Kaufman Scher, Sherrie Bitterman, Madeline Droher, Erica L Herzog, Gilbert Moeckel, Anil Karihaloo, Neera K Dahl
BACKGROUND: Semaphorin 7A (SEMA7A) is an immunomodulating protein implicated in lung and liver fibrosis. In autosomal-dominant polycystic kidney disease (ADPKD), the progressive expansion of renal cysts, inflammation, and subsequent renal fibrosis leads to end-stage renal disease (ESRD). SEMA7A may play a role in renal fibrosis and in ADPKD. METHODS: We evaluated Sema7a in a mouse model of renal fibrosis and determined the expression of SEMA7A in human ADPKD kidney...
February 16, 2018: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/29453398/host-defense-against-oral-microbiota-by-bone-damaging-t-cells
#5
Masayuki Tsukasaki, Noriko Komatsu, Kazuki Nagashima, Takeshi Nitta, Warunee Pluemsakunthai, Chisa Shukunami, Yoichiro Iwakura, Tomoki Nakashima, Kazuo Okamoto, Hiroshi Takayanagi
The immune system evolved to efficiently eradicate invading bacteria and terminate inflammation through balancing inflammatory and regulatory T-cell responses. In autoimmune arthritis, pathogenic T H 17 cells induce bone destruction and autoimmune inflammation. However, whether a beneficial function of T-cell-induced bone damage exists is unclear. Here, we show that bone-damaging T cells have a critical function in the eradication of bacteria in a mouse model of periodontitis, which is the most common infectious disease...
February 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29453041/microrna-signature-of-regulatory-t-cells-in-health-and-autoimmunity
#6
REVIEW
Mehdi Soltanzadeh-Yamchi, Mehdi Shahbazi, Saeed Aslani, Mousa Mohammadnia-Afrouzi
MicroRNAs (miRNAs) are small RNA molecules with regulatory functions on the expression of genes through binding directly to target messenger RNA (mRNA) transcripts, eventuating in gene expression suppression via translational hindrance and/or target mRNA cleavage. These molecules have been established to participate in numerous critical cellular settings, including differentiation, development, and function of immune cells. As an important suppressor cell of immune system, regulatory T cells (Tregs) are important in modulating the immune homeostasis as well as tolerance to self-antigens...
February 13, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29452961/dipeptidyl-peptidase-4-inhibitors-dpp-4i-combined-with-vitamin-d3-an-exploration-to-treat-new-onset-type-1-diabetes-mellitus-and-latent-autoimmune-diabetes-in-adults-in-the-future
#7
Marcelo Maia Pinheiro, Felipe Moura Maia Pinheiro, Maria Luisa Trabachin
Type 1 diabetes mellitus (T1DM) is a chronic autoimmune disease characterized by destruction of pancreatic beta cells through cell injury caused primarily by cytotoxic T lymphocytes (CD8 + ). The pathophysiological basis of T1DM seems to be an imbalance between a reduced function of T regulatory lymphocytes and an increased inflammatory activity of Th17 lymphocytes caused by increased production of inflammatory cytokines, as IL-1β, IL-6, IL-17 and IFN-gamma due to environmental factors and genetic predisposition...
February 13, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29452898/transcriptional-and-epigenetic-regulation-of-innate-like-t-lymphocyte-development
#8
REVIEW
Mihalis Verykokakis, Barbara L Kee
Invariant Natural Killer T (iNKT) cells are a heterogeneous innate T cell population that recognizes lipid antigens. Despite the monospecific nature of their T cell receptor, iNKT cells differentiate into stable sublineages during thymic development, before foreign antigen encounter. How iNKT cell subsets acquire and maintain their functional programs is a central question in innate lymphocyte biology. Global transcriptional and epigenetic profiling of iNKT subsets has provided insights into the internal wiring of these subsets that defines their identity...
February 13, 2018: Current Opinion in Immunology
https://www.readbyqxmd.com/read/29452585/beta-2-adrenergic-receptors-increase-treg-cell-suppression-in-an-ova-induced-allergic-asthma-mouse-model-when-mice-are-moderate-aerobically-exercised
#9
Kari J Dugger, Taylor Chrisman, Sarah L Sayner, Parker Chastain, Kacie Watson, Robert Estes
BACKGROUND: The potency of T regulatory (TREG) cells to inhibit T helper (Th)-driven immune cell responses has been linked to increased intracellular cyclic-AMP (cAMP) levels of TREG cells. In an ovalbumin (OVA)-driven allergic asthma mouse model, moderate aerobic exercise increases TREG cell function in a contact-dependent manner that leads to a significant reduction in chronic inflammation and restoration of lung function. However, the mechanism, whereby exercise increases TREG function, remains unknown and was the focus of these investigations...
February 17, 2018: BMC Immunology
https://www.readbyqxmd.com/read/29452228/a-bach2-gene-variant-is-associated-with-postoperative-recurrence-of-crohn-s-disease
#10
Michael R Laffin, Richard N Fedorak, Eytan Wine, Bryan Dicken, Karen L Madsen
BACKGROUND: Crohn's disease often requires intestinal resection, which is not considered curative. Repeat surgical intervention is necessary in over half of the patients following their initial operation. Although many genetic loci are implicated in Crohn's disease, few have been associated with post-resection recurrence. STUDY DESIGN: A cohort of Crohn's disease subjects who underwent intestinal resection was analyzed to determine genetic and clinical factors associated with post-resection recurrence...
February 13, 2018: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/29452096/the-macrophage-heme-heme-oxygenase-1-system-and-its-role-in-inflammation
#11
REVIEW
Vijith Vijayan, Frank A D T G Wagener, Stephan Immenschuh
Heme oxygenase (HO)-1, the inducible isoform of the heme-degrading enzyme HO, plays a critical role in inflammation and iron homeostasis. Regulatory functions of HO-1 are mediated via the catalytic breakdown of heme, which is an iron-containing tetrapyrrole complex with potential pro-oxidant and pro-inflammatory effects. The HO reaction produces the antioxidant and anti-inflammatory compounds carbon monoxide (CO) and biliverdin, subsequently converted into bilirubin, along with iron, which is reutilized for erythropoiesis...
February 13, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29450641/chronic-lymphocytic-leukemia-cells-acquire-regulatory-b-cell-properties-in-response-to-tlr9-and-cd40-activation
#12
Shimrit Ringelstein-Harlev, Irit Avivi, Mona Fanadka, Netanel A Horowitz, Tami Katz
Circulating chronic lymphocytic leukemia (CLL) cells share phenotypic features with certain subsets of regulatory B-cells (Bregs). The latter cells have been reported to negatively regulate immune cell responses, mostly by provision of IL-10. The purpose of the current study was to identify and delineate Breg properties of CLL cells. B-cells and T-cells were obtained from the peripheral blood of untreated CLL patients diagnosed according to the 2008 Guidelines of the International Workshop on Chronic Lymphocytic Leukemia...
February 15, 2018: Cancer Immunology, Immunotherapy: CII
https://www.readbyqxmd.com/read/29449936/function-of-aquaporins-in-sepsis-a-systematic-review
#13
REVIEW
Katharina Rump, Michael Adamzik
Background: Sepsis is a common cause of death in intensive care units worldwide. Due to the high complexity of this immunological syndrome development of novel therapeutic strategies is urgent. Promising drug targets or biomarkers may depict aquaporins (AQPs) as they regulate crucial key mechanisms of sepsis. Main body: Here we report on base of the current literature that several AQPs are involved in different physiological processes of sepsis. In immune system mainly AQPs 3, 5 and 9 seem to be important, as they regulate the migration of different immune cells...
2018: Cell & Bioscience
https://www.readbyqxmd.com/read/29449887/role-of-the-t-and-b-lymphocytes-in-pathogenesis-of-autoimmune-thyroid-diseases
#14
Marta Rydzewska, Michał Jaromin, Izabela Elżbieta Pasierowska, Karlina Stożek, Artur Bossowski
Autoimmune thyroid disorders (AITD) broadly include Graves' disease and Hashimoto's thyroiditis which are the most common causes of thyroid gland dysfunctions. These disorders develop due to complex interactions between environmental and genetic factors and are characterized by reactivity to self-thyroid antigens due to autoreactive lymphocytes escaping tolerance. Both cell-mediated and humoral responses lead to tissue injury in autoimmune thyroid disease. The differentiation of CD4+ cells in the specific setting of immune mediators (for example cytokines, chemokines) results in differentiation of various T cell subsets...
2018: Thyroid Research
https://www.readbyqxmd.com/read/29449559/downregulation-of-srebp-inhibits-tumor-growth-and-initiation-by-altering-cellular-metabolism-in-colon-cancer
#15
Yang-An Wen, Xiaopeng Xiong, Yekaterina Y Zaytseva, Dana L Napier, Emma Vallee, Austin T Li, Chi Wang, Heidi L Weiss, B Mark Evers, Tianyan Gao
Sterol regulatory element-binding proteins (SREBPs) belong to a family of transcription factors that regulate the expression of genes required for the synthesis of fatty acids and cholesterol. Three SREBP isoforms, SREBP1a, SREBP1c, and SREBP2, have been identified in mammalian cells. SREBP1a and SREBP1c are derived from a single gene through the use of alternative transcription start sites. Here we investigated the role of SREBP-mediated lipogenesis in regulating tumor growth and initiation in colon cancer...
February 15, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29449556/cd1d-dependent-immune-suppression-mediated-by-regulatory-b-cells-through-modulations-of-inkt-cells
#16
K Oleinika, E C Rosser, D E Matei, K Nistala, A Bosma, I Drozdov, C Mauri
Regulatory B cells (Breg) express high levels of CD1d that presents lipid antigens to invariant natural killer T (iNKT) cells. The function of CD1d in Breg biology and iNKT cell activity during inflammation remains unclear. Here we show, using chimeric mice, cell depletion and adoptive cell transfer, that CD1d-lipid presentation by Bregs induces iNKT cells to secrete interferon (IFN)-γ to contribute, partially, to the downregulation of T helper (Th)1 and Th17-adaptive immune responses and ameliorate experimental arthritis...
February 15, 2018: Nature Communications
https://www.readbyqxmd.com/read/29448043/estrogen-serum-concentration-affects-blood-immune-cell-composition-and-polarization-in-human-females-under-controlled-ovarian-stimulation
#17
Pardes Habib, Daniela Dreymueller, Benjamin Rösing, Hannes Botung, Alexander Slowik, Adib Zendedel, Shahin Habib, Stefanie Hoffmann, Cordian Beyer
Estrogens modulate the immune system and possess anti-inflammatory properties. In line, immune cells express a variety of estrogen receptors (ER) including ER-alpha and -beta. In the present study, we examined the influence of 17beta-estradiol (E2) serum concentrations on blood leukocyte composition and their ex vivo polarization/activation status by FACS analysis in sub-fertile human females under controlled ovarian stimulation (COS). Using a set of cell-type and polarization-specific markers, we demonstrate that increased 17ß-estradiol (E2) serum concentrations yield an overall increase in leukocytes, neutrophils and monocytes but decreased lymphocytes...
February 12, 2018: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29447956/pubertal-chlorocholine-chloride-exposure-inhibits-testicular-testosterone-synthesis-by-down-regulating-steroidogenic-enzymes-in-adult-rats
#18
Xiaohong Hou, Dan Huang, Qinghe Meng, Qi Zhang, Lixia Jia, Siqi Wang, Zhiyuan Cheng, Shuang Wu, Lanqin Shang, Jianjun Jiang, Weidong Hao
Chlorocholine chloride (CCC) is widely used to regulate plant growth. Considerable attention has been focused on its reproductive and developmental toxicities. In order to investigate the effects of pubertal CCC exposure on testicular testosterone (T) synthesis, male SD rats were exposed to CCC by oral gavage at doses of 0, 75, 150 and 300 mg/kg bw/day from postnatal day 23 to 70. We observed that pubertal CCC exposure lowered the body weight and the mean Johnsen's score. The percentage of seminiferous tubules with deciduous spermatogenic cells was increased in the 75 and 150 mg/kg bw/day groups...
February 12, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29447279/regulatory-t-cells-in-retroviral-infections
#19
REVIEW
Kim J Hasenkrug, Claire A Chougnet, Ulf Dittmer
Tight regulation of immune responses is not only critical for preventing autoimmune diseases but also for preventing immunopathological damage during infections in which overactive immune responses may be more harmful for the host than the pathogen itself. Regulatory T cells (Tregs) play a critical role in this regulation, which was discovered using the Friend retrovirus (FV) mouse model. Subsequent FV studies revealed basic biological information about Tregs, including their suppressive activity on effector cells as well as the molecular mechanisms of virus-induced Treg expansion...
February 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29446998/considerations-for-clinical-review-of-cellular-therapy-products-perspectives-of-the-china-food-and-drug-administration-center-for-drug-evaluation
#20
Yantong Liu, Chenyang Zhao, Liucun Gao, Huan Yang, Ruyi He, Chenyan Gao
With increasing numbers of technical developments and clinical studies, pioneering cellular/gene therapies are now available that could cure life-threatening disease. Cellular/gene therapy products are broad-ranging and complicated, and thereby bring challenges for clinical review by regulatory agencies. This review discusses principles for the clinical review of cellular therapy products, including protection of clinical trial populations, pharmacodynamics, pharmacokinetics, dose evaluation, clinical efficacy, clinical safety, and risk-management plans...
February 2018: Human Gene Therapy
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