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CD4(+)CD25(+)FOXP3(+) T

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https://www.readbyqxmd.com/read/28531229/protein-kinase-c-theta-is-dispensable-for-suppression-mediated-by-cd25-cd4-regulatory-t-cells
#1
Kerstin Siegmund, Nikolaus Thuille, Katarzyna Wachowicz, Natascha Hermann-Kleiter, Gottfried Baier
The activation of conventional T cells upon T cell receptor stimulation critically depends on protein kinase C theta (PKCθ). However, its role in regulatory T (Treg) cell function has yet to be fully elucidated. Using siRNA or the potent and PKC family-selective pharmacological inhibitor AEB071, we could show that murine Treg-mediated suppression in vitro is independent of PKCθ function. Likewise, Treg cells of PKCθ-deficient mice were fully functional, showing a similar suppressive activity as wild-type CD25+CD4+ T cells in an in vitro suppression assay...
2017: PloS One
https://www.readbyqxmd.com/read/28522286/increased-proportions-of-functionally-impaired-regulatory-t-cell-subsets-in-systemic-sclerosis
#2
Emese Ugor, Diána Simon, Giovanni Almanzar, Ramóna Pap, József Najbauer, Péter Németh, Péter Balogh, Martina Prelog, László Czirják, Tímea Berki
Treg abnormalities have been implicated in the pathogenesis of systemic sclerosis (SSc). Treg subpopulations and their cytokines, IL-10 and TGF-β in the peripheral blood of early stage SSc patients were investigated. We hypothesized that epigenetically regulated methylation of the FOXP3 promoter and enhancer regions are altered in Tregs of SSc patients, which might be involved in the T cell imbalance. CD4+CD25+Foxp3+CD127- Treg cells were significantly elevated in patients with diffuse cutaneous SSc and in patients with anti-Scl-70/RNA-Pol-III autoantibody positivity and with lung fibrosis...
May 15, 2017: Clinical Immunology: the Official Journal of the Clinical Immunology Society
https://www.readbyqxmd.com/read/28506261/a-possible-role-of-low-regulatory-t-cells-in-anti-acetylcholine-receptor-antibody-positive-myasthenia-gravis-after-bone-marrow-transplantation
#3
Masahiko Fukatsu, Takenobu Murakami, Hiroshi Ohkawara, Shunichi Saito, Kazuhiko Ikeda, Suguru Kadowaki, Itaru Sasaki, Mari Segawa, Tomoko Soeda, Akihiko Hoshi, Hiroshi Takahashi, Akiko Shichishima-Nakamura, Kazuei Ogawa, Yoshihiro Sugiura, Hitoshi Ohto, Yasuchika Takeishi, Takayuki Ikezoe, Yoshikazu Ugawa
BACKGROUND: Chronic graft-versus-host disease (GVHD) appears several months following allogenic hematopoietic stem cell transplantation (HSCT) and is clinically analogous to autoimmune disorder. Polymyositis is a common neuromuscular disorder in chronic GVHD, but myasthenia gravis (MG) is extremely rare. Hence, its pathophysiology and treatment have not been elucidated. CASE PRESENTATION: A 63-year-old man with a history of chronic GVHD presented with ptosis, dropped head, and dyspnea on exertion, which had worsened over the previous several months...
May 15, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28504276/targeted-calcium-influx-boosts-cytotoxic-t-lymphocyte-function-in-the-tumour-microenvironment
#4
Kyun-Do Kim, Seyeon Bae, Tara Capece, Hristina Nedelkovska, Rafael G de Rubio, Alan V Smrcka, Chang-Duk Jun, Woojin Jung, Byeonghak Park, Tae-Il Kim, Minsoo Kim
Adoptive cell transfer utilizing tumour-targeting cytotoxic T lymphocytes (CTLs) is one of the most effective immunotherapies against haematological malignancies, but significant clinical success has not yet been achieved in solid tumours due in part to the strong immunosuppressive tumour microenvironment. Here, we show that suppression of CTL killing by CD4(+)CD25(+)Foxp3(+) regulatory T cell (Treg) is in part mediated by TGFβ-induced inhibition of inositol trisphosphate (IP3) production, leading to a decrease in T cell receptor (TCR)-dependent intracellular Ca(2+) response...
May 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28501127/c-c-motif-chemokine-22-ligand-ccl22-concentrations-in-sera-of-gastric-cancer-patients-are-related-to-peritoneal-metastasis-and-predict-recurrence-within-one-year-after-radical-gastrectomy
#5
Yuzhe Wei, Tie Wang, Hongjiang Song, Lining Tian, Gongwei Lyu, Lei Zhao, Yingwei Xue
BACKGROUND: Gastric cancer is a common cancer with a poor prognosis. Chemokines play important roles in the tumor microenvironments to support tumor growth and metastasis. The effects of C-C motif chemokine ligand 22 (CCL22) in gastric cancer remain unclear. MATERIALS AND METHODS: Between January 1, 2014 and April 31, 2014, a total of 298 gastric cancer patients were recruited to this study. Circulating concentrations of CCL22 were measured in gastric cancer patients before surgery, at discharged and during follow-up visits...
May 1, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28493494/stat3-promotes-bone-fracture-healing-by-enhancing-the-foxp3-expression-and-the-suppressive-function-of-regulatory-t-cells
#6
Guojing Sun, Zhen Wang, Yunfan Ti, Yicun Wang, Jun Wang, Jianning Zhao, Hongbo Qian
Signal transducer and activator of transcription 3 (STAT3) is a key signaling protein in the skeletal system as well as in the immune system. Accumulating evidence demonstrates that the inflammatory response is deeply involved in the healing process of bone fractures, but how the immune system is regulated during this process is unclear. In this study, we examined STAT3-mediated regulation of immunity in adult patients with closed tibia fracture. In all patients, the expression and activation of STAT3 peaked at around day 7 to day 14 after surgery, and gradually decreased during the rest of the healing period...
May 11, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/28487700/l-arginine-dependent-epigenetic-regulation-of-interleukin-10-but-not-transforming-growth-factor-%C3%AE-production-by-neonatal-regulatory-t-lymphocytes
#7
Hong-Ren Yu, Ching-Chang Tsai, Ling-Sai Chang, Hsin-Chun Huang, Hsin-Hsin Cheng, Jiu-Yao Wang, Jiunn-Ming Sheen, Ho-Chang Kuo, Kai-Sheng Hsieh, Ying-Hsien Huang, Kuender D Yang, Te-Yao Hsu
A growing number of diseases in humans, including trauma, certain cancers, and infection, are known to be associated with l-arginine deficiency. In addition, l-arginine must be supplemented by diet during pregnancy to aid fetal development. In conditions of l-arginine depletion, T cell proliferation is impaired. We have previously shown that neonatal blood has lower l-arginine levels than adult blood, which is associated with poor neonatal lymphocyte proliferation, and that l-arginine enhances neonatal lymphocyte proliferation through an interleukin (IL)-2-independent pathway...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28487695/regulatory-t-cells-and-pro-inflammatory-responses-predominate-in-children-with-tuberculosis
#8
Elizabeth Whittaker, Mark Nicol, Heather J Zar, Beate Kampmann
BACKGROUND: Following infection with Mycobacterium tuberculosis (M.tb), children are more susceptible to develop disease particularly extrapulmonary disease than adults. The exact mechanisms required for containment of M.tb are not known, but would be important to identify correlates of protection. OBJECTIVE: To comprehensively analyze key immune responses to mycobacteria between HIV-negative children with extrapulmonary TB (EPTB) compared to children with pulmonary TB (PTB) or healthy controls...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28485810/expression-of-indoleamine-2-3-dioxygenase-in-pregnant-mice-correlates-with-cd4-cd25-foxp3-t-regulatory-cells
#9
L-L Yu, Y-H Zhang, F-X Zhao
OBJECTIVE: Indoleamine 2,3-dioxygenase (IDO) initiated tryptophan degradation in the placenta has a role in the prevention of allogeneic fetus rejection by T-cells. The present study aimed to investigate the relationship between IDO and CD4+CD25+Foxp3+ T cells in pregnant mice. MATERIALS AND METHODS: The percentage of CD4+CD25+Foxp3+ T cells in peripheral blood mononuclear cells (PBMC) and IDO mRNA levels were detected in pregnant mice. The non-pregnant mice were used as control in this study...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28484460/intralymphatic-administration-of-adipose-mesenchymal-stem-cells-reduces-the-severity-of-collagen-induced-experimental-arthritis
#10
Pablo Mancheño-Corvo, Mercedes Lopez-Santalla, Ramon Menta, Olga DelaRosa, Francisca Mulero, Borja Del Rio, Cristina Ramirez, Dirk Büscher, Juan A Bueren, Juan Lopez-Belmonte, Wilfried Dalemans, Marina I Garin, Eleuterio Lombardo
Mesenchymal stem cells (MSCs) are multipotent stromal cells with immunomodulatory properties. They have emerged as a very promising treatment for autoimmunity and inflammatory diseases such as rheumatoid arthritis. Previous studies have demonstrated that MSCs, administered systemically, migrate to lymphoid tissues associated with the inflammatory site where functional MSC-induced immune cells with a regulatory phenotype were increased mediating the immunomodulatory effects of MSCs. These results suggest that homing of MSCs to the lymphatic system plays an important role in the mechanism of action of MSCs in vivo...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28483181/decreased-levels-of-spleen-tissue-cd4-cd25-foxp3-regulatory-t-lymphocytes-in-mice-exposed-to-berberine
#11
Gholamreza Karimi, Mahmoud Mahmoudi, Mahdi Balali-Mood, Maryam Rahnama, Shahrzad Zamani Taghizadeh Rabe, Nafiseh Tabasi, Bamdad Riahi-Zanjani
The effects of isoquinoline alkaloid berberine (BER) on spleen tissue CD4(+)CD25(+)Foxp3(+) regulatory T (Treg) cells were evaluated in BALB/c mice. Here, BER was administered daily by intraperitoneal injection at doses of 5 mg/kg and 10 mg/kg for 14 days. Following the exposure, mice spleen cellularities, IL-10 production by splenocytes, and spleen Treg/CD4(+) cell profiles were studied in all the test groups of animals. The results showed that a high dose of BER (10 mg/kg) could decrease both the absolute and relative percentages of spleen Treg cells as well as decrease the production of IL-10 by splenocytes in the treated mice (p<0...
April 2017: Journal of Acupuncture and Meridian Studies
https://www.readbyqxmd.com/read/28480292/sex-disparity-in-cord-blood-foxp3-cd4-t-regulatory-cells-in-infants-exposed-to-malaria-in-utero
#12
Mary Prahl, Prasanna Jagannathan, Tara I McIntyre, Ann Auma, Samuel Wamala, Mayimuna Nalubega, Kenneth Musinguzi, Kate Naluwu, Esther Sikyoma, Rachel Budker, Pamela Odorizzi, Abel Kakuru, Diane V Havlir, Moses R Kamya, Grant Dorsey, Margaret E Feeney
Sex differences in the immune response and in infectious disease susceptibility have been well described, although the mechanisms underlying these differences remain incompletely understood. We evaluated the frequency of cord blood CD4 T cell subsets in a highly malaria-exposed birth cohort of mother-infant pairs in Uganda by sex. We found that frequencies of cord blood regulatory T cell ([Treg] CD4(+)CD25(+)FoxP3(+)CD127(lo/-)) differed by infant sex, with significantly lower frequencies of Tregs in female than in male neonates (P = ...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28479331/forkhead-box-protein-3-foxp3-demethylation-is-associated-with-tolerance-induction-in-peanut-induced-intestinal-allergy
#13
Meiqin Wang, Ivana V Yang, Elizabeth J Davidson, Anthony Joetham, Katsuyuki Takeda, Brian P O'Connor, Erwin W Gelfand
BACKGROUND: Regulatory T cells (Tregs) play an essential role in the maintenance of immune homeostasis in allergic diseases. OBJECTIVES: To define the mechanisms underlying induction of tolerance to peanut protein and prevention of the development of peanut allergy. METHODS: High or low doses of peanut extract (PE) were administered to pups every day for 2 weeks prior to peanut sensitization and challenge. Following challenge, symptoms, Treg numbers, FoxP3, Th2, Th17 cytokine and TGFβ expression in mesenteric lymph node (MLN) CD4(+) T cells and in jejunum were monitored...
May 4, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28479234/controlled-delivery-of-single-or-multiple-antigens-in-tolerogenic-nanoparticles-using-peptide-polymer-bioconjugates
#14
Ryan M Pearson, Liam M Casey, Kevin R Hughes, Leon Z Wang, Madeleine G North, Daniel R Getts, Stephen D Miller, Lonnie D Shea
Polymeric nanoparticles (NPs) have demonstrated their potential to induce antigen (Ag)-specific immunological tolerance in multiple immune models and are at various stages of commercial development. Association of Ag with NPs is typically achieved through surface coupling or encapsulation methods. However, these methods have limitations that include high polydispersity, uncontrollable Ag loading and release, and possible immunogenicity. Here, using antigenic peptides conjugated to poly(lactide-co-glycolide), we developed Ag-polymer conjugate NPs (acNPs) with modular loading of single or multiple Ags, negligible burst release, and minimally exposed surface Ag...
May 4, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28477096/expanding-diversity-and-common-goal-of-regulatory-t-and-b-cells-i-origin-phenotype-mechanisms
#15
REVIEW
Katarzyna Bocian, Ewelina Kiernozek, Joanna Domagała-Kulawik, Grażyna Korczak-Kowalska, Anna Stelmaszczyk-Emmel, Nadzieja Drela
Immunosuppressive activity of regulatory T and B cells is critical to limit autoimmunity, excessive inflammation, and pathological immune response to conventional antigens or allergens. Both types of regulatory cells are intensively investigated, however, their development and mechanisms of action are still not completely understood. Both T and B regulatory cells represent highly differentiated populations in terms of phenotypes and origin, however, they use similar mechanisms of action. The most investigated CD4(+)CD25(+) regulatory T cells are characterized by the expression of Foxp3(+) transcription factor, which is not sufficient to maintain their lineage stability and suppressive function...
May 5, 2017: Archivum Immunologiae et Therapiae Experimentalis
https://www.readbyqxmd.com/read/28475005/impact-of-the-immune-cell-population-in-peripheral-blood-on-response-and-survival-in-patients-receiving-neoadjuvant-chemotherapy-for-advanced-gastric-cancer
#16
Qi He, Guoli Li, Xiang Ji, Long Ma, Xulin Wang, Yang Li, Chaogang Fan
We aimed to investigate the prognostic value of the immune cells population in peripheral blood from patients with advanced gastric cancer treated with neoadjuvant chemotherapy. A total of 105 patients with advanced gastric cancer were evaluated in this study. Blood samples were collected before and 1 week after the last dose of chemotherapy. The percentage of CD3+, CD3+CD4+, CD3+CD8+, and CD4+CD25+Foxp3+ T cells was assessed using flow cytometry analysis. The relationship between T cell subsets and clinical outcome was evaluated...
May 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28472762/oroxylin-a-inhibits-the-generation-of-tregs-in-non-small-cell-lung-cancer
#17
Le Shen, Lu-Lu Zhang, Hui Li, Xiao Liu, Xiao-Xuan Yu, Po Hu, Hui Hui, Qing-Long Guo, Shuai Zhang
Oroxylin A (OA), a naturally occurring monoflavonoid isolated from Scutellariae radix, has previously been reported to inhibit the proliferation of several cancer cell lines. CD4+CD25+Foxp3+ regulatory T cells (Tregs) play an important role in maintenance of immunologic self-tolerance. Tregs also increase in cancer and take part in suppressing antitumor immune responses. Here, we explored how OA affected the Tregs in lung cancer environment and the involved underlying mechanism. It is found that OA reversed the generation of Tregs induced by H460 lung cancer cells co-culture...
April 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/28471112/immune-recovery-after-fluid-resuscitation-in-rats-with-severe-hemorrhagic-shock
#18
Feng Yao, Yuan-Qiang Lu, Jiu-Kun Jiang, Lin-Hui Gu, Han-Zhou Mou
OBJECTIVE: To investigate the effects of resuscitation with normal saline (NS), hypertonic saline (HTS), and hydroxyethyl starch (HES) on regulatory T cells (Tregs), helper T 1 (Th1)/Th2 and cytotoxic T 1 (Tc1)/Tc2 profiles in the treatment of hemorrhagic shock. METHODS: Rats subjected to severe hemorrhagic shock were resuscitated for 30 min with NS (n=8), HTS (n=8), or HES (n=8); sham (n=8) and naive control (n=8) groups were used for comparison. Following fluid resuscitation, the whole shed blood was reinfused for 30 min, and the rats were observed with continuous hemodynamic monitoring for 120 min...
May 2017: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/28467828/dominant-protection-from-hla-linked-autoimmunity-by-antigen-specific-regulatory-t-cells
#19
Joshua D Ooi, Jan Petersen, Yu H Tan, Megan Huynh, Zoe J Willett, Sri H Ramarathinam, Peter J Eggenhuizen, Khai L Loh, Katherine A Watson, Poh Y Gan, Maliha A Alikhan, Nadine L Dudek, Andreas Handel, Billy G Hudson, Lars Fugger, David A Power, Stephen G Holt, P Toby Coates, Jon W Gregersen, Anthony W Purcell, Stephen R Holdsworth, Nicole L La Gruta, Hugh H Reid, Jamie Rossjohn, A Richard Kitching
Susceptibility and protection against human autoimmune diseases, including type I diabetes, multiple sclerosis, and Goodpasture disease, is associated with particular human leukocyte antigen (HLA) alleles. However, the mechanisms underpinning such HLA-mediated effects on self-tolerance remain unclear. Here we investigate the molecular mechanism of Goodpasture disease, an HLA-linked autoimmune renal disorder characterized by an immunodominant CD4(+) T-cell self-epitope derived from the α3 chain of type IV collagen (α3135-145)...
May 11, 2017: Nature
https://www.readbyqxmd.com/read/28455530/nkg2d-cd4-t-cells-kill-regulatory-t-cells-in-a-nkg2d-nkg2d-ligand-dependent-manner-in-systemic-lupus-erythematosus
#20
Di Yang, Zhiqiang Tian, Mengjie Zhang, Weibing Yang, Jun Tang, Yuzhang Wu, Bing Ni
Systemic lupus erythematosus (SLE) features a decreased pool of CD4(+)CD25(+)Foxp3(+) T regulatory (Treg) cells. We had previously observed NKG2D(+)CD4(+) T cell expansion in contrast to a decreased pool of Treg cells in SLE patients, but whether NKG2D(+)CD4(+) T cells contribute to the decreased Treg cells remains unclear. In the present study, we found that the NKG2D(+)CD4(+) T cells efficiently killed NKG2D ligand (NKG2DL)(+) Treg cells in vitro, whereby the surviving Treg cells in SLE patients showed no detectable expression of NKG2DLs...
April 28, 2017: Scientific Reports
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