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T cell immunology

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https://www.readbyqxmd.com/read/27913631/cutting-edge-lymphotoxin-signaling-is-essential-for-clearance-of-salmonella-from-the-gut-lumen-and-generation-of-anti-salmonella-protective-immunity
#1
Joanna A Wroblewska, Yuan Zhang, Haidong Tang, Xiaohuan Guo, Cathryn Nagler, Yang-Xin Fu
The immunological components that control resolution of Salmonella infection and successful vaccination are poorly defined. In a model of chronic gastrointestinal infection, we observed that the lymphotoxin (LT) pathway is essential for the clearance and resolution of primary infection of attenuated Salmonella enterica Typhimurium strain SL3261 ΔaroA Using gnotobiotic mice, we show that LTβ receptor (LTβR) signaling and the microbiota are required to promote clearance of attenuated S. enterica Typhimurium from the gut lumen...
December 2, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27913524/cellular-and-vaccine-immunotherapy-for-multiple-myeloma
#2
Alfred L Garfall, Edward A Stadtmauer
Allogeneic hematopoietic cell transplantation and donor lymphocyte infusion for multiple myeloma (MM) can induce graft-versus-myeloma immunity and long-term survivorship, but limited efficacy and associated toxicities have prevented its widespread use. Cellular immunotherapies and vaccines seek to induce more specific, reliable, and potent antimyeloma immune responses with less treatment-related risk than is possible with allogeneic transplantation. Advances in molecular biology, and basic and applied immunology, have led to promising approaches such as genetically engineered T cells with chimeric antigen receptors and T-cell receptors targeting myeloma-specific epitopes, vaccine primed ex vivo expanded autologous T cells, expanded marrow-infiltrating lymphocytes, and plasma cell/dendritic cell fusion vaccines...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27913287/ganoderma-atrum-polysaccharide-ameliorates-ros-generation-and-apoptosis-in-spleen-and-thymus-of-immunosuppressed-mice
#3
Wen-Juan Li, Lu Li, Weng-Ya Zhen, Le-Feng Wang, Meng Pan, Jia-Qian Lv, Fan Wang, Yu-Fei Yao, Shao-Ping Nie, Ming-Yong Xie
Ganoderma atrum polysaccharide (PSG-1) is a bioactive compound with antioxidant and immunomodulatory activities. The aim of this study was to determine the effect of PSG-1 on reactive oxygen species (ROS) generation and apoptosis in spleen and thymus of cyclophosphamide (CTX)-induced immunosuppressed mice. The results showed that PSG-1 protected mice against CTX-mediated immunosuppression, as evidenced by enhancing the ratios of thymus and spleen weights to body weight, promoting T cell and B cell survival, and increasing levels of TNF-α and IL-2...
November 29, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27912911/hesperidin-ameliorates-immunological-outcome-and-reduces-neuroinflammation-in-the-mouse-model-of-multiple-sclerosis
#4
Dariush Haghmorad, Mohammad Bagher Mahmoudi, Zohreh Salehipour, Zoleikha Jalayer, Amir Abbas Momtazi Brojeni, Maryam Rastin, Parviz Kokhaei, Mahmoud Mahmoudi
Multiple sclerosis (MS) is the most abundant central nervous system (CNS) inflammatory disease, which is due to the reaction of auto reactive T cells with own myelin proteins, leading to physical disorder and paralysis among people suffering the disease. Hesperidin, a flavanone glycoside found abundantly in citrus fruits possesses a wide range of pharmacological properties including potential anti-inflammatory and anti-cancer effects. This study was designed to reveal the molecular and cellular mechanisms underlying the effect of hesperidin on MS alleviation...
November 26, 2016: Journal of Neuroimmunology
https://www.readbyqxmd.com/read/27912316/th2-cells-in-health-and-disease
#5
Toshinori Nakayama, Kiyoshi Hirahara, Atsushi Onodera, Yusuke Endo, Hiroyuki Hosokawa, Kenta Shinoda, Damon J Tumes, Yoshitaka Okamoto
Helper T (Th) cell subsets direct immune responses by producing signature cytokines. Th2 cells produce IL-4, IL-5, and IL-13, which are important in humoral immunity and protection from helminth infection and are central to the pathogenesis of many allergic inflammatory diseases. Molecular analysis of Th2 cell differentiation and maintenance of function has led to recent discoveries that have refined our understanding of Th2 cell biology. Epigenetic regulation of Gata3 expression by chromatin remodeling complexes such as Polycomb and Trithorax is crucial for maintaining Th2 cell identity...
November 28, 2016: Annual Review of Immunology
https://www.readbyqxmd.com/read/27911371/development-of-stem-cell-derived-antigen-specific-regulatory-t-cells-against-autoimmunity
#6
Mohammad Haque, Kristin Fino, Praneet Sandhu, Jianxun Song
Autoimmune diseases arise due to the loss of immunological self-tolerance. Regulatory T cells (Tregs) are important mediators of immunologic self-tolerance. Tregs represent about 5 - 10% of the mature CD4(+) T cell subpopulation in mice and humans, with about 1 - 2% of those Tregs circulating in the peripheral blood. Induced pluripotent stem cells (iPSCs) can be differentiated into functional Tregs, which have a potential to be used for cell-based therapies of autoimmune diseases. Here, we present a method to develop antigen (Ag)-specific Tregs from iPSCs (i...
November 8, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911218/aberrant-t-cell-immunity-triggered-by-human-respiratory-syncytial-virus-and-human-metapneumovirus-infection
#7
Andrea E González, Margarita K Lay, Evelyn L Jara, Janyra A Espinoza, Roberto S Gómez, Jorge Soto, Claudia A Rivera, Katia Abarca, Susan M Bueno, Claudia A Riedel, Alexis M Kalergis
Human Respiratory syncytial virus (hRSV) and human metapneumovirus (hMPV) are the two major etiological viral agents of lower respiratory tract diseases, affecting mainly infants, young children and the elderly. Although the infection of both viruses trigger an antiviral immune response that mediate viral clearance and disease resolution in immunocompetent individuals, the promotion of long-term immunity appears to be deficient and reinfection are common throughout life. A possible explanation for this phenomenon is that hRSV and hMPV, can induce aberrant T cell responses, which leads to exacerbated lung inflammation and poor T and B cell memory immunity...
December 2, 2016: Virulence
https://www.readbyqxmd.com/read/27910751/recent-advances-in-pharmacotherapeutic-paradigm-of-mild-to-recalcitrant-atopic-dermatitis
#8
Zahid Hussain, Shariza Sahudin, Hnin Ei Thu, Ahmad Nazrun Shuid, Syed Nasir Abbas Bukhari, Endang Kumolosasi
Atopic dermatitis (AD) is a common, chronic skin inflammatory disorder characterized by perivascular infiltration of immunoglobulin E (IgE), T lymphocytes, and mast cells. The key factors responsible for the pathophysiology of this disease are immunological disorders and defects in epidermal barrier properties. Pruritus, intense itching, psychological stress, deprived physical and mental performance, and sleep disturbance are the hallmark features of this dermatological disorder. Preventive interventions such as educational programs, avoidance of allergens, and exclusive care toward the skin could play a partial role in suppressing the symptoms...
2016: Critical Reviews in Therapeutic Drug Carrier Systems
https://www.readbyqxmd.com/read/27909701/immunological-quality-and-performance-of-tumor-vessel-targeting-car-t-cells-prepared-by-mrna-ep-for-clinical-research
#9
Kanako Inoo, Ryo Inagaki, Kento Fujiwara, Shigemi Sasawatari, Takashi Kamigaki, Shinsaku Nakagawa, Naoki Okada
We previously reported that tumor vessel-redirected T cells, which were genetically engineered with chimeric antigen receptor (CAR) specific for vascular endothelial growth factor receptor 2 (VEGFR2), demonstrated significant antitumor effects in various murine solid tumor models. In the present study, we prepared anti-VEGFR2 CAR-T cells by CAR-coding mRNA electroporation (mRNA-EP) and analyzed their immunological characteristics and functions for use in clinical research. The expression of anti-VEGFR2 CAR on murine and human T cells was detected with approximately 100% efficiency for a few days, after peaking 6-12 hours after mRNA-EP...
2016: Molecular Therapy Oncolytics
https://www.readbyqxmd.com/read/27909059/the-role-of-the-histone-methyltransferase-enhancer-of-zeste-homolog-2-ezh2-in-the-pathobiological-mechanisms-underlying-inflammatory-bowel-disease-ibd
#10
Olga F Sarmento, Phyllis A Svingen, Yuning Xiong, Zhifu Sun, Adebowale O Bamidele, Angela J Mathison, Thomas C Smyrk, Asha A Nair, Michelle M Gonzalez, Mary R Sagstetter, Saurabh Baheti, Dermot P B McGovern, Jessica J Friton, Konstantinos A Papadakis, Goel Gautam, Ramnik J Xavier, Raul A Urrutia, William A Faubion
Regulatory T (Treg) cells expressing the transcription factor FOXP3 play a pivotal role in maintaining immunologic self-tolerance. We and others have previously shown that EZH2 is recruited to the FOXP3 promoter and its targets in Treg cells. To further address the role for EZH2 in Treg cellular function, we have now generated mice that lack EZH2 specifically in Treg cells (EZH2ΔFOXP3+). We find that EZH2 deficiency in FOXP3+ T cells results in lethal multi-organ autoimmunity. We further demonstrate that EZH2ΔFOXP3+ T cells lack a regulatory phenotype in vitro and secrete pro-inflammatory cytokines...
December 1, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27908931/filling-the-tank-keeping-antitumor-t-cells-metabolically-fit-for-the-long-haul
#11
REVIEW
Greg M Delgoffe
Discoveries in tumor immunology and subsequent clinical advances in cancer immunotherapy have revealed that the immune system is not oblivious to tumor progression but heavily interacts with developing neoplasia and malignancy. A major factor preventing immune destruction is the establishment of a highly immunosuppressive tumor microenvironment (TME), which provides architecture to the tumor, supports indirect means of immunosuppression such as the recruitment of tolerogenic cells like regulatory T cells and myeloid-derived suppressor cells (MDSC), and represents a zone of metabolically dearth conditions...
December 2016: Cancer Immunology Research
https://www.readbyqxmd.com/read/27908754/cyclic-citrullinated-mbp87-99-peptide-stimulates-t-cell-responses-implications-in-triggering-disease
#12
Vasso Apostolopoulos, George Deraos, Minos-Timotheos Matsoukas, Stephanie Day, Lily Stojanovska, Theodore Tselios, Maria-Eleni Androutsou, John Matsoukas
Amino acid mutations to agonist peptide epitopes of myelin proteins have been used to modulate immune responses and experimental autoimmune encephalomyelitis (EAE, animal model of multiple sclerosis). Such amino acid alteration are termed, altered peptide ligands (APL). We have shown that the agonist myelin basic protein (MBP) 87-99 epitope (MBP87-99) with crucial T cell receptor (TCR) substitutions at positions 91 and 96 (K(91),P(96) (TCR contact residues) to R(91),A(96); [R(91),A(96)]MBP87-99) results in altered T cell responses and inhibits EAE symptoms...
November 19, 2016: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/27907136/immune-activation-and-bacterial-translocation-a-link-between-impaired-immune-recovery-and-frequent-visceral-leishmaniasis-relapses-in-hiv-infected-patients
#13
Maria Luciana Silva-Freitas, Glaucia Fernandes Cota, Talia S Machado-de-Assis, Carmem Giacoia-Gripp, Ana Rabello, Alda M Da-Cruz, Joanna R Santos-Oliveira
The maintenance of chronic immune activation due to leishmaniasis or even due to microbial translocation is associated with immunosenescence and may contribute to frequent relapses. Our aim was to investigate whether patients with HIV-associated visceral leishmaniasis (VL/HIV) who experience a single episode of VL have different immunological behaviors in comparison to those who experience frequent relapses. VL/HIV patients were allocated to non-relapsing (NR, n = 6) and relapsing (R, n = 11) groups and were followed from the active phase of VL up to 12 months post-treatment (mpt)...
2016: PloS One
https://www.readbyqxmd.com/read/27905000/decidual-natural-killer-cells-and-the-immune-microenvironment-at-the-maternal-fetal-interface
#14
REVIEW
Binqing Fu, Haiming Wei
During early pregnancy, an orchestrated evolutionary maternal adaption toward tolerance of the semiallogeneic fetus is required to ensure decidualization and early embryo development. Remodeling of the immune system involves natural killer cells (NKs), macrophages, T cells and dendritic cells (DCs) altering the microenvironment in the deciduas. In particular, a unique population of NK cells with a CD56(bright)CD16(-) phenotype in the decidua has been proposed to play a key role in the maternal adaptation to pregnancy...
November 29, 2016: Science China. Life Sciences
https://www.readbyqxmd.com/read/27903738/tgf-%C3%AE-controls-the-formation-of-kidney-resident-t-cells-via-promoting-effector-t-cell-extravasation
#15
Chaoyu Ma, Shruti Mishra, Erika L Demel, Yong Liu, Nu Zhang
Tissue-resident memory T (TRM) cells, a population of noncirculating memory T cells, are one of the essential components of immunological memory in both mouse and human. Although CD69(+)CD103(+) TRM cells represent a major TRM cell population in barrier tissues including the mucosal surface and the skin, CD69(+)CD103(-) TRM cells dominate most nonbarrier tissues, such as the kidney. TGF-β is required for the differentiation of CD69(+)CD103(+) TRM cells in barrier tissues. However, the developmental control of CD69(+)CD103(-) TRM cells in nonbarrier tissues remains largely unknown and the involvement of TGF-β signaling is less clear...
November 30, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27903680/herpes-simplex-virus-specific-t-cell-response-in-a-cohort-with-primary-genital-infection-correlates-inversely-with-frequency-of-subsequent-recurrences
#16
Elisabeth Franzen-Röhl, Danika Schepis, Fredrik Atterfelt, Kristina Franck, Arne Wikström, Jan-Åke Liljeqvist, Tomas Bergström, Elisabeth Aurelius, Klas Kärre, Louise Berg, Hans Gaines
OBJECTIVES: During the last decades, a changing epidemiological pattern of genital herpes simplex virus (HSV) infection has emerged. Primary infection is now caused as often by HSV-1 as by HSV-2. Once established, HSV can be reactivated leading to recurrent mucocutaneous lesions as well as meningitis. Why some otherwise immune-competent individuals experience severe and frequent recurrences is not known, and the immunological mechanism underlying recurrent symptomatic HSV infection is not fully understood...
November 30, 2016: Sexually Transmitted Infections
https://www.readbyqxmd.com/read/27903079/preclinical-evaluation-of-a-replication-deficient-recombinant-adenovirus-serotype-5-vaccine-expressing-guanylate-cyclase-c-and-the-padre-t-helper-epitope
#17
Adam Eugene Snook, Trevor R Baybutt, Terry Hyslop, Scott Arthur Waldman
There is an unmet need for improved therapeutics for colorectal cancer, the second leading cause of cancer mortality worldwide. Adjuvant chemotherapy only marginally improves survival in some patients, and has no benefit in others, underscoring the clinical opportunity for novel immunotherapeutic approaches to improve survival in colorectal cancer. In that context, guanylate cyclase C (GUCY2C) is an established biomarker and therapeutic target for metastatic colorectal cancer with immunological characteristics that promote durable antitumor efficacy without autoimmunity...
November 30, 2016: Human Gene Therapy Methods
https://www.readbyqxmd.com/read/27900450/il-9-and-th9-in-parasite-immunity
#18
REVIEW
P Licona-Limón, A Arias-Rojas, E Olguín-Martínez
Interleukin-9 is a cytokine classically related to type 2 immune responses whose cellular identity has been recently reevaluated to identify a new specialized T helper subset called Th9 and an innate source referred as innate lymphoid cell type 2. Over the past years, IL-9 has been associated with allergic responses, tumor immunology, and autoimmunity; however, in this review, we will specifically focus on the role of IL-9 and Th9 cells in the context of parasitic infections. We will summarize and discuss all the evidence relating IL-9 expression and function in parasitic infections with a particular emphasis in helminth infections, an important health issue in developing countries; we will also provide a general description and classification of parasites, the immune response and cellular compartments activated in this context, and its implications and future directions towards a complete understanding of this interesting new T helper subset and its potential therapeutic use...
November 29, 2016: Seminars in Immunopathology
https://www.readbyqxmd.com/read/27899813/the-pro-fibrotic-role-of-dipeptidyl-peptidase-4-in-carbon-tetrachloride-induced-experimental-liver-injury
#19
Xin M Wang, Lauren E Holz, Sumaiya Chowdhury, Shaun P Cordoba, Kathryn A Evans, Margaret G Gall, Ana Júlia Vieira de Ribeiro, Yuan Zhou Zheng, Miriam T Levy, Denise M T Yu, Tsun-Wen Yao, Natasa Polak, Christopher J Jolly, Patrick Bertolino, Geoffrey W McCaughan, Mark D Gorrell
Liver fibrosis is a progressive pathological process involving inflammation and extracellular matrix deposition. Dipeptidyl peptidase 4 (DPP4), also known as CD26, is a cell surface glycoprotein and serine protease. DPP4 binds to fibronectin, can inactivate specific chemokines, incretin hormone and neuropeptides, and influences cell adhesion and migration. Such properties suggest a pro-fibrotic role for this peptidase but this hypothesis needs in vivo examination. Experimental liver injury was induced with carbon tetrachloride (CCl4) in DPP4 gene knockout (gko) mice...
November 30, 2016: Immunology and Cell Biology
https://www.readbyqxmd.com/read/27899803/novel-targets-in-the-treatment-of-chronic-graft-versus-host-disease
#20
REVIEW
A Im, F T Hakim, S Z Pavletic
Despite advances that have improved survival after allogeneic hematopoietic stem cell transplantation (HCT), chronic graft-versus-host disease (GVHD) remains a leading cause of late morbidity and mortality after transplant. Current treatment options show limited efficacy in steroid-refractory disease, and there exists a paucity of robust data to guide management decisions. Lack of United States Food and Drug Administration (FDA) or European Medicines Agency (EMA) approved agents in GVHD underscore the importance of developing novel therapies...
November 30, 2016: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
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