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https://www.readbyqxmd.com/read/29151021/regulatory-t-cells-induced-by-b-cells-a-novel-subpopulation-of-regulatory-t-cells
#1
REVIEW
Chien-Hui Chien, Bor-Luen Chiang
Regulatory T cells play a crucial role in the homeostasis of the immune response. In addition to CD4(+)Foxp3(+) regulatory T cells, several subsets of Foxp3(-) regulatory T cells, such as T helper 3 (Th3) cells and type 1 regulatory T (Tr1) cells, have been described in mice and human. Accumulating evidence shows that naïve B cells contribute to tolerance and are able to promote regulatory T cell differentiation. Naïve B cells can convert CD4(+)CD25(-) T cells into CD25(+)Foxp3(-) regulatory T cells, named Treg-of-B cells by our group...
November 18, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/29150659/ectopic-foxp3-expression-preserves-primitive-features-of-human-hematopoietic-stem-cells-while-impairing-functional-t-cell-differentiation
#2
F R Santoni de Sio, L Passerini, M M Valente, F Russo, L Naldini, M G Roncarolo, R Bacchetta
FOXP3 is the transcription factor ruling regulatory T cell function and maintenance of peripheral immune tolerance, and mutations in its coding gene causes IPEX autoimmune syndrome. FOXP3 is also a cell-cycle inhibitor and onco-suppressor in different cell types. In this work, we investigate the effect of ectopic FOXP3 expression on HSC differentiation and we challenged this approach as a possible HSC-based gene therapy for IPEX. FOXP3-expressing HSC showed reduced proliferation ability and increased maintenance of primitive markers in vitro in both liquid and OP9-ΔL1 co-cultures...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29149782/frequency-of-circulatory-regulatory-immune-cells-in-iranian-patients-with-type-1-diabetes
#3
Tahereh Khamehchian, Eqlim Nemati, Marziyeh Jazayeri, Shirin Azimi, Hassan Nikoueinejad, Hossein Akbari, Behnaz Irandoust
Type 1 diabetes (T1D) is the result of the autoimmune destruction of insulin-producing beta cells. Regulatory T cells (Tregs) and plasmacytoid dendritic cells (PDCs) act as mediators of peripheral tolerance. We investigated the possible alterations of such cells in peripheral blood of patients with T1D compared to normal individuals. This comparison may lead to a better understanding of the immunopathogenesis processes involved in T1D. 92 participants, including 49 patients with T1D and 43 healthy controls were studied...
October 2017: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/29149780/interleukin-37-relieves-allergic-inflammation-in-a-house-dust-mite-allergic-rhinitis-murine-model
#4
Do Hyun Kim, Si Won Kim, Soo Whan Kim, Jun-Myung Kang
The purpose of this study was to investigate the effects of interleukin-37 (IL-37) on a Dermatophagoides farinae (Der f)-induced murine model of allergic rhinitis (AR). BALB/c mice, except the control groups, were sensitized intraperitoneally and challenged intranasally with Der f (Der f group). The IL-37 and IL-37+anti-CD25 groups were administered IL-37 intranasally. The IL-37+anti-CD25 groups were administered anti-CD25 monoclonal antibody intraperitoneally before challenge. Allergic symptoms and the average eosinophil number were counted...
October 2017: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/29149778/the-changes-of-th17-treg-and-related-cytokines-il-17-il-23-il-10-and-tgf-%C3%AE-in-respiratory-syncytial-virus-bronchiolitis-rat-model
#5
Meng Gao, Liang-Xiao Liu, Fu-Ling Wu, Xuejing Zhang, Ying-Ying Li, Tao Shi, De-Zhi Li, Ting-Ting Han
Respiratory syncytial virus (RSV) is the leading cause of bronchiolitis and hospitalization that lead to high morbidity and mortality among young infants. T helper 17 (Th17) cells and regulatory T cells (Tregs) play essential roles in the pathogenesis of autoimmune, cancer, and inflammatory diseases. However, whether changes in T-cell subsets are related to the systemic immune responses in RSV-caused bronchiolitis merit further investigation. Three-week-old Sprague Dawley (SD) rats were randomly divided into the normal control (NC) and RSV bronchiolitis (RSV-B) groups...
October 2017: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/29149705/toll-like-receptor-4-deficiency-increases-resistance-in-sepsis-induced-immune-dysfunction
#6
Chao Cao, Yanfen Chai, Songtao Shou, Jun Wang, Ying Huang, Tao Ma
Sepsis constitutes a serious life-threatening syndrome associated with complications of deregulated inflammatory response against endotoxin/lipopolysaccharide (LPS)-mediated severe infection. Toll-like receptor 4 (TLR4) plays a critical role in the activation of innate immunity through recognition of LPS. However, the impact of TLR4 signaling on the development of sepsis-induced immune dysfunction remains unclear. The aim of this study was to investigate the effect of TLR4 on regulatory T cells (Tregs) and its potential mechanism...
November 14, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/29148410/th17-gene-expression-in-psoriatic-arthritis-synovial-fluid-and-peripheral-blood-compared-to-osteoarthritis-and-cutaneous-psoriasis
#7
Fatima Abji, Remy A Pollock, Kun Liang, Vinod Chandran, Dafna D Gladman
OBJECTIVES: The IL-23/IL-17 axis is central to the pathogenesis of psoriatic arthritis (PsA). We aimed to identify Th17 signalling genes that are dysregulated in synovial fluid of PsA compared to osteoarthritis (OA) patients and to determine if differences in peripheral blood can distinguish PsA from psoriasis patients and controls. METHODS: Synovial fluid cells (SFCs) from 14 PsA and 9 OA patients were obtained and stored in TRIzol reagent. RNA was isolated by phenol-chloroform extraction and purified with RNeasy miniprep kits...
November 9, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/29147616/mrna-expression-levels-of-genes-involved-in-antitumor-immunity-identification-of-a-3-gene-signature-associated-with-prognosis-of-muscle-invasive-bladder-cancer
#8
Constance Le Goux, Sophie Vacher, Géraldine Pignot, Mathilde Sibony, Nicolas Barry Delongchamps, Benoit Terris, Eliane Piaggio, Marc Zerbib, Diane Damotte, Ivan Bieche
Immunotherapy for bladder cancer has given promising results. Here we aimed to evaluate the possible involvement and prognostic value of 33 genes involved in the immune response during bladder carcinogenesis. Expression levels were assessed by quantitative real-time RT-PCR in normal and tumor human bladder samples. Immunohistochemistry was performed to evaluate the protein expression of 2 genes and relation of the mRNA and protein levels was analyzed. Tumors were obtained from 154 patients (83 with muscle-invasive bladder cancer [MIBC] and 71 non-MIBC [NMIBC]) who underwent transurethral bladder resection or radical cystectomy between 2002 and 2006...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/29147611/chloroquine-supplementation-increases-the-cytotoxic-effect-of-curcumin-against-her2-neu-overexpressing-breast-cancer-cells-in-vitro-and-in-vivo-in-nude-mice-while-counteracts-it-in-immune-competent-mice
#9
L Masuelli, M Granato, M Benvenuto, R Mattera, R Bernardini, M Mattei, G d'Amati, G D'Orazi, A Faggioni, R Bei, M Cirone
Autophagy is usually a pro-survival mechanism in cancer cells, especially in the course of chemotherapy, thus autophagy inhibition may enhance the chemotherapy-mediated anti-cancer effect. However, since autophagy is strongly involved in the immunogenicity of cell death by promoting ATP release, its inhibition may reduce the immune response against tumors, negatively influencing the overall outcome of chemotherapy. In this study, we evaluated the in vitro and in vivo anti-cancer effect of curcumin (CUR) against Her2/neu overexpressing breast cancer cells (TUBO) in the presence or in the absence of the autophagy inhibitor chloroquine (CQ)...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/29147608/the-prognostic-role-of-tumor-infiltrating-t-lymphocytes-in-squamous-cell-carcinoma-of-the-head-and-neck-a-systematic-review-and-meta-analysis
#10
REVIEW
Emma J de Ruiter, Marc L Ooft, Lot A Devriese, Stefan M Willems
Background - The presence of tumor-infiltrating lymphocytes (TILs) in the tumor microenvironment is associated with an improved prognosis and a better response to therapy in different types of cancer. In this systematic review and meta-analysis, we investigated the prognostic value of T cells in head and neck squamous cell carcinoma (HNSCC). Methods - In a systematic review, Pubmed and Embase were searched for publications that investigated the prognostic value of T cells in HNSCC. A meta-analysis was performed including all studies assessing the association between CD3+, CD4+, CD8+, and FoxP3+ TILs and overall survival (OS), disease-free survival (DFS), or locoregional control (LRC)...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/29147008/the-transcription-factor-batf3-inhibits-the-differentiation-of-regulatory-t-cells-in-the-periphery
#11
Wonyong Lee, Hyeong Su Kim, Soo Seok Hwang, Gap Ryol Lee
Naive CD4 T cells activated by antigen-presenting cells (APCs) undergo terminal differentiation in the periphery. Multiple mechanisms determine their fates, that is, whether they differentiate into conventional T (Tconv) cells or regulatory T (Treg) cells. The key event during Treg generation is expression of the transcription factor Foxp3, which is the lineage-determining regulator for Treg differentiation and function. Here we show that the transcription factor Batf3 acts as a fate-decision factor with respect to Tconv versus Tregs by restraining Treg differentiation...
November 17, 2017: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/29145950/a-combination-of-allogeneic-stem-cells-promotes-cardiac-regeneration
#12
Makoto Natsumeda, Victoria Florea, Angela C Rieger, Bryon A Tompkins, Monisha N Banerjee, Samuel Golpanian, Julia Fritsch, Ana Marie Landin, Nilesh D Kashikar, Vasileios Karantalis, Viky Y Loescher, Kostas E Hatzistergos, Luiza Bagno, Cristina Sanina, Muzammil Mushtaq, Jose Rodriguez, Marcos Rosado, Ariel Wolf, Kevin Collon, Louis Vincent, Anthony J Kanelidis, Ivonne H Schulman, Raul Mitrani, Alan W Heldman, Wayne Balkan, Joshua M Hare
BACKGROUND: The combination of autologous mesenchymal stem cells (MSCs) and cardiac stem cells (CSCs) synergistically reduces scar size and improves cardiac function in ischemic cardiomyopathy. Whereas allogeneic (allo-)MSCs are immunoevasive, the capacity of CSCs to similarly elude the immune system remains controversial, potentially limiting the success of allogeneic cell combination therapy (ACCT). OBJECTIVES: This study sought to test the hypothesis that ACCT synergistically promotes cardiac regeneration without provoking immunologic reactions...
November 14, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29145862/l161982-alleviates-collagen-induced-arthritis-in-mice-by-increasing-treg-cells-and-down-regulating-interleukin-17-and-monocyte-chemoattractant-protein-1-levels
#13
Liang Chen, Xianglei Wu, Jun Zhong, Dongqing Li
BACKGROUND: To investigate the effects and potential mechanism of L161982 (a kind of EP4 antagonist) on the collagen-induced arthritis (CIA) mice model. METHODS: The CIA mice model were first established by immunizing with Chicken Type II Collagen on DBA/1 mice. The CIA groups were administered once a day for 2 weeks with either 5 mg/kg L161982 by intraperitoneal injections (IP), 200 U celecoxib by intragastrical injections, or 100 μl PBS (IP). At the end of the study, total arthritis score and histopathologic examination were assessed to determine CIA severity...
November 16, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29145543/association-of-ipilimumab-with-safety-and-antitumor-activity-in-women-with-metastatic-or-recurrent-human-papillomavirus-related-cervical-carcinoma
#14
Stephanie Lheureux, Marcus O Butler, Blaise Clarke, Mihaela C Cristea, Lainie P Martin, Katia Tonkin, Gini F Fleming, Anna V Tinker, Hal W Hirte, Daliah Tsoref, Helen Mackay, Neesha C Dhani, Prafull Ghatage, Johanne Weberpals, Stephen Welch, Nhu-An Pham, Vinicius Motta, Valentin Sotov, Lisa Wang, Katherine Karakasis, Smitha Udagani, Suzanne Kamel-Reid, Howard Z Streicher, Patricia Shaw, Amit M Oza
Importance: Based on evidence of human papillomavirus (HPV)-induced immune evasion, immunotherapy may be an attractive strategy in cervical cancer. Ipilimumab is a fully humanized monoclonal antibody that blocks cytotoxic T-lymphocyte antigen-4 (CTLA-4), which acts to downregulate the T-cell immune response. Objective: To assess the safety and antitumor activity of ipilimumab in recurrent cervical cancer. Design, Setting, and Participants: A multicenter trial was designed for patients with metastatic cervical cancer (squamous cell carcinoma or adenocarcinoma) with measurable disease and progression after at least 1 line of platinum chemotherapy...
November 16, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/29143918/induction-of-cd4-cd25-foxp3-regulatory-t-cells-by-mesenchymal-stem-cells-is-associated-with-runx-complex-factors
#15
Maryam Khosravi, Ali Bidmeshkipour, Ali Moravej, Suzzan Hojjat-Assari, Sina Naserian, Mohammad Hossein Karimi
Among the particular immunomodulation properties of mesenchymal stem cells (MSCs), one relies on their capacity to regulatory T cell (Treg) induction from effector T cells. Stable expression of Foxp3 has a dominant role in suppressive phenotype and stability of induced regulatory T cells (iTregs). How MSCs induce stable Foxp3 expression in iTregs remains unknown. We previously showed MSCs could enhance demethylation of Treg-specific demethylated region (TSDR) in iTregs in cell-cell contact manner (unpublished data)...
November 16, 2017: Immunologic Research
https://www.readbyqxmd.com/read/29143917/lambda-phage-nanoparticles-displaying-her2-derived-e75-peptide-induce-effective-e75-cd8-t-response
#16
Atefeh Arab, Jessica Nicastro, Roderick Slavcev, Atefeh Razazan, Nastaran Barati, Amin Reza Nikpoor, Amir Abbas Momtazi Brojeni, Fatemeh Mosaffa, Ali Badiee, Mahmoud Reza Jaafari, Javad Behravan
We have investigated the in vitro immunogenicity and in vivo prophylactic and therapeutic potential of lambda (λ) phage particles displaying the E75 peptide (derived from HER2 protein) in an implantable TUBO breast tumor model of BALB/c mice. The mice were immunized with the E75-displaying phage (λF7-gpD::E75) every 2-week intervals over a 6-week period, and the generated immune responses were studied. Results showed in vitro induction of immune responses by the λF7 (gpD::E75) construct compared to the control λF7 and buffer groups...
November 16, 2017: Immunologic Research
https://www.readbyqxmd.com/read/29142309/hypercholesterolemia-enhances-t-cell-receptor-signaling-and-increases-the-regulatory-t-cell-population
#17
Reiner K W Mailer, Anton Gisterå, Konstantinos A Polyzos, Daniel F J Ketelhuth, Göran K Hansson
Hypercholesterolemia promotes the inflammation against lipoproteins in atherosclerosis. Development of atherosclerosis is affected by the balance between pro-inflammatory effector T cells and anti-inflammatory regulatory T (Treg) cells. However, phenotype and function of T cell subpopulations in hypercholesterolemia remain to be investigated. Here, we found that cholesterol-containing diet increased the expression of the Treg cell lineage-defining transcription factor FoxP3 among thymocytes and splenocytes...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141218/reciprocal-expression-of-il-35-and-il-10-defines-two-distinct-effector-treg-subsets-that-are-required-for-maintenance-of-immune-tolerance
#18
Xundong Wei, Jianhua Zhang, Qianchong Gu, Man Huang, Wei Zhang, Jie Guo, Xuyu Zhou
Regulatory T cells (Tregs) can exert their functions through multiple suppressive mechanisms; however, it is unclear how Tregs exactly employ these mechanisms. In this study, we found that interleukin-35 (IL-35)-producing Tregs were a distinct effector population from the IL-10-producing subset. We also revealed that these two subsets of effector Tregs have different transcription factor dependency. Terminal differentiation regulator Blimp1 was only critical for IL-10 production, but not for IL-35; Foxp3 was essential for IL-35 but dispensable for IL-10 production...
November 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/29141216/slc3a2-mediates-branched-chain-amino-acid-dependent-maintenance-of-regulatory-t-cells
#19
Kayo Ikeda, Makoto Kinoshita, Hisako Kayama, Shushi Nagamori, Pornparn Kongpracha, Eiji Umemoto, Ryu Okumura, Takashi Kurakawa, Mari Murakami, Norihisa Mikami, Yasunori Shintani, Satoko Ueno, Ayatoshi Andou, Morihiro Ito, Hideki Tsumura, Koji Yasutomo, Keiichi Ozono, Seiji Takashima, Shimon Sakaguchi, Yoshikatsu Kanai, Kiyoshi Takeda
Foxp3(+) regulatory T (Treg) cells, which suppress immune responses, are highly proliferative in vivo. However, it remains unclear how the active replication of Treg cells is maintained in vivo. Here, we show that branched-chain amino acids (BCAAs), including isoleucine, are required for maintenance of the proliferative state of Treg cells via the amino acid transporter Slc3a2-dependent metabolic reprogramming. Mice fed BCAA-reduced diets showed decreased numbers of Foxp3(+) Treg cells with defective in vivo proliferative capacity...
November 14, 2017: Cell Reports
https://www.readbyqxmd.com/read/29140541/regulatory-t-cells-in-acute-dengue-viral-infection
#20
Eresha Jayaratne, Dulharie Wijeratne, Samitha Fernando, Achala Kamaladasa, Laksiri Gomes, Ananda Wijewickrama, Graham Stuart Ogg, Gathsaurie Neelika Malavige
Although regulatory T cells (Tregs) have been shown to be expanded in acute dengue, their role in pathogenesis and their relationship to clinical disease severity, and extent of viraemia have not been fully evaluated. The frequency of Tregs was assessed in 56 adult patients with acute dengue, by determining the proportion of FOXP3 expressing CD4(+) CD25(+) T cells (FOXP3+ cells). DENV viral loads were measured by quantitative real time PCR and DENV specific T cell responses were measured by ex vivo IFNγ ELISpot assays to overlapping peptide pools of DENV-NS3, NS1 and NS5...
November 15, 2017: Immunology
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