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resident memory T cell

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https://www.readbyqxmd.com/read/28930685/human-tissue-resident-memory-t-cells-are-defined-by-core-transcriptional-and-functional-signatures-in-lymphoid-and-mucosal-sites
#1
Brahma V Kumar, Wenji Ma, Michelle Miron, Tomer Granot, Rebecca S Guyer, Dustin J Carpenter, Takashi Senda, Xiaoyun Sun, Siu-Hong Ho, Harvey Lerner, Amy L Friedman, Yufeng Shen, Donna L Farber
Tissue-resident memory T cells (TRMs) in mice mediate optimal protective immunity to infection and vaccination, while in humans, the existence and properties of TRMs remain unclear. Here, we use a unique human tissue resource to determine whether human tissue memory T cells constitute a distinct subset in diverse mucosal and lymphoid tissues. We identify a core transcriptional profile within the CD69(+) subset of memory CD4(+) and CD8(+) T cells in lung and spleen that is distinct from that of CD69(-) TEM cells in tissues and circulation and defines human TRMs based on homology to the transcriptional profile of mouse CD8(+) TRMs...
September 19, 2017: Cell Reports
https://www.readbyqxmd.com/read/28927891/vitiligo-skin-is-imprinted-with-resident-memory-cd8-t-cells-expressing-cxcr3
#2
Katia Boniface, Clément Jacquemin, Anne-Sophie Darrigade, Benoît Dessarthe, Christina Martins, Nesrine Boukhedouni, Charlotte Vernisse, Alexis Grasseau, Denis Thiolat, Jérôme Rambert, Fabienne Lucchese, Antoine Bertolotti, Khaled Ezzedine, Alain Taieb, Julien Seneschal
Vitiligo is a chronic auto-immune depigmenting skin disorder that results from a loss of melanocytes. Multiple combinatorial factors have been involved in disease development, with a prominent role of the immune system, in particular T cells. After repigmentation, vitiligo frequently recurs in the same area, suggesting that vitiligo could involve the presence of resident memory T cells (TRM). We sought to perform a thorough characterization of the phenotype and function of skin memory T cells in vitiligo. We show that stable and active vitiligo perilesional skin is enriched with a population of CD8 TRM expressing both CD69 and CD103 compared to psoriasis and control unaffected skin...
September 16, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28920584/liver-resident-nk-cells-and-their-potential-functions
#3
Hui Peng, Rui Sun
Natural killer (NK) cells represent a heterogeneous population of innate lymphocytes with phenotypically and functionally distinct subsets. In particular, recent studies have identified a unique subset of NK cells residing within the liver that are maintained as tissue-resident cells, confer antigen-specific memory responses and exhibit different phenotypical and developmental characteristics compared with conventional NK (cNK) cells. These findings have encouraged researchers to uncover tissue-resident NK cells at other sites, and detailed analyses have revealed that these tissue-resident NK cells share many similarities with liver-resident NK cells and tissue-resident memory T cells...
September 18, 2017: Cellular & Molecular Immunology
https://www.readbyqxmd.com/read/28910403/polymicrobial-sepsis-impairs-bystander-recruitment-of-effector-cells-to-infected-skin-despite-optimal-sensing-and-alarming-function-of-skin-resident-memory-cd8-t-cells
#4
Derek B Danahy, Scott M Anthony, Isaac J Jensen, Stacey M Hartwig, Qiang Shan, Hai-Hui Xue, John T Harty, Thomas S Griffith, Vladimir P Badovinac
Sepsis is a systemic infection that enhances host vulnerability to secondary infections normally controlled by T cells. Using CLP sepsis model, we observed that sepsis induces apoptosis of circulating memory CD8 T-cells (TCIRCM) and diminishes their effector functions, leading to impaired CD8 T-cell mediated protection to systemic pathogen re-infection. In the context of localized re-infections, tissue resident memory CD8 T-cells (TRM) provide robust protection in a variety of infectious models. TRM rapidly 'sense' infection in non-lymphoid tissues and 'alarm' the host by enhancing immune cell recruitment to the site of the infection to accelerate pathogen clearance...
September 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28894184/il-7-plays-a-critical-role-for-the-homeostasis-of-allergen-specific-memory-cd4-t-cells-in-the-lung-and-airways
#5
Seung-Min Yeon, Lea Halim, Anmol Chandele, Curtis J Perry, Sang Hoon Kim, Sun-Uk Kim, Youngjoo Byun, Soon Hong Yuk, Susan M Kaech, Yong Woo Jung
Memory T cells respond rapidly to repeated antigen exposure and can maintain their population for extended periods through self-renewal. These characteristics of memory T cells have mainly been studied during viral infections, whereas their existence and functions in allergic diseases have been studied incompletely. Since allergic patients can suffer repeated relapses caused by intermittent allergen exposure, we hypothesized that allergen- specific memory Th2 cells are present and the factors necessary for the maintenance of these cells are provided by the lung and airways...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28872670/tcr-pmhc-encounter-differentially-regulates-transcriptomes-of-tissue-resident-cd8-t-cells
#6
Akihiro Yoshikawa, Kevin Bi, Derin B Keskin, Guanglang Zhang, Bruce Reinhold, Ellis L Reinherz
To investigate the role of TCR-pMHC interaction in regulating lung CD8 tissue-resident T cell (TR ) differentiation, polyclonal responses were compared against NP366-374 /D(b) and PA224-233 /D(b) , two immunodominant epitopes that arise during influenza A infection in mice. Memory niches distinct from iBALTs develop within the lamina propria, supporting CD103+ and CD103- CD8 TR generation and intraepithelial translocation. Gene set enrichment analysis (GSEA) and weighted gene co-expression network analysis (WGCNA) identify dominant TCR, adherence junction, RIG-I-like and NOD-like pattern recognition receptor as well as TGFβ signaling pathways and memory signatures among PA224-233 /D(b) T cells consistent with T resident memory (TRM ) status...
September 5, 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/28864473/hvem-imprints-memory-potential-on-effector-cd8-t-cells-required-for-protective-mucosal-immunity
#7
Pritesh Desai, Georges Abboud, Jessica Stanfield, Paul G Thomas, Jianxun Song, Carl F Ware, Michael Croft, Shahram Salek-Ardakani
Mucosal immunity to reinfection with a highly virulent virus requires the accumulation and persistence of memory CD8 T cells at the site of primary infection. These cells may derive from memory precursor effector cells (MPECs), which are distinct from short-lived effector cells that provide acute protection but are often destined to die. Using respiratory virus infection, we show that herpes virus entry mediator (HVEM; TNFRSF14), a member of the TNF receptor superfamily, provides key signals for MPEC persistence...
September 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28860025/hepatitis-e-virus-induced-primary-cutaneous-cd30-t-cell-lymphoproliferative-disorder
#8
Vincent Mallet, Julie Bruneau, Julien Zuber, Cécile Alanio, Stéphanie Leclerc-Mercier, Anne-Marie Roque-Afonso, Anke R M Kraft, Lucile Couronné, Dominique Roulot, Heiner Wedemeyer, Matthew L Albert, Patrick Hillon, Liliane Laroche, Stanislas Pol, Olivier Hermine
BACKGROUND AND AIM: Several types of unexplained extra-hepatic manifestations, including haematological disorders, have been reported in the context of hepatitis E virus (HEV) infection. However, the underlying mechanism(s) of these manifestations are unknown. We provide evidence that HEV has an extra-hepatic endothelial tropism that can engage cutaneous T cells towards clonality. PATIENT AND METHODS: A patient with a CD30(+) cutaneous T cell lymphoproliferative disorder (T-LPD) and biopsy-proven chronic HEV infection received 3 rounds of oral ribavirin treatment administered either without or with interferon and eventually achieved a sustained virological response (SVR)...
August 28, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28855310/chemokine-receptor-dependent-control-of-skin-tissue-resident-memory-t-cell-formation
#9
Ali Zaid, Jyh Liang Hor, Susan N Christo, Joanna R Groom, William R Heath, Laura K Mackay, Scott N Mueller
Infection or inflammation of the skin recruits effector CD8(+) T cells that enter the epidermis and form populations of long-lived tissue-resident memory T (TRM) cells. These skin TRM cells migrate within the constrained epidermal environment by extending multiple dynamic dendritic projections and squeezing between keratinocytes to survey the tissue for pathogens. In this study, we examined the signals required for this distinctive mode of T cell migration by inhibiting key cytoskeletal components and performing intravital two-photon microscopy to visualize TRM cell behavior...
August 30, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28855242/reduced-generation-of-lung-tissue-resident-memory-t-cells-during-infancy
#10
Kyra D Zens, Jun Kui Chen, Rebecca S Guyer, Felix L Wu, Filip Cvetkovski, Michelle Miron, Donna L Farber
Infants suffer disproportionately from respiratory infections and generate reduced vaccine responses compared with adults, although the underlying mechanisms remain unclear. In adult mice, lung-localized, tissue-resident memory T cells (TRMs) mediate optimal protection to respiratory pathogens, and we hypothesized that reduced protection in infancy could be due to impaired establishment of lung TRM. Using an infant mouse model, we demonstrate generation of lung-homing, virus-specific T effectors after influenza infection or live-attenuated vaccination, similar to adults...
August 30, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28842633/expression-and-role-of-vla-1-in-resident-memory-cd8-t-cell-responses-to-respiratory-mucosal-viral-vectored-immunization-against-tuberculosis
#11
Siamak Haddadi, Niroshan Thanthrige-Don, Sam Afkhami, Amandeep Khera, Mangalakumari Jeyanathan, Zhou Xing
Lung resident memory T cells (TRM) characterized by selective expression of mucosal integrins VLA-1 (α1β1) and CD103 (αEβ7) are generated following primary respiratory viral infections. Despite recent progress, the generation of lung TRM and the role of mucosal integrins following viral vector respiratory mucosal immunization still remains poorly understood. Here by using a replication-defective viral vector tuberculosis vaccine, we show that lung Ag-specific CD8 T cells express both VLA-1 and CD103 following respiratory mucosal immunization...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28838148/serum-c-reactive-protein-and-congestive-heart-failure-as-significant-predictors-of-herpes-zoster-vaccine-response-in-elderly-nursing-home-residents
#12
Chris P Verschoor, Alina Lelic, Robin Parsons, Carole Evelegh, Jonathan L Bramson, Jennie Johnstone, Mark B Loeb, Dawn M E Bowdish
Background: Elderly long-term care residents often exhibit a myriad of risk factors for immune dysfunction, including chronic inflammation and multiple comorbid conditions, which undoubtedly contribute to their enhanced susceptibility to infection. Hence, understanding the factors required for optimal vaccine responsiveness is critical. Methods: We examined 187 elderly nursing home residents (aged 80-102 years) and 50 community-dwelling seniors (aged 60-75 years) immunized with the live-attenuated varicella-zoster virus (VZV) vaccine...
July 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28832609/distinct-aging-profiles-of-cd8-t-cells-in-blood-versus-gastrointestinal-mucosal-compartments
#13
Jeffrey Dock, Christina M Ramirez, Lance Hultin, Mary Ann Hausner, Patricia Hultin, Julie Elliott, Otto O Yang, Peter A Anton, Beth D Jamieson, Rita B Effros
A hallmark of human immunosenescence is the accumulation of late-differentiated memory CD8+ T cells with features of replicative senescence, such as inability to proliferate, absence of CD28 expression, shortened telomeres, loss of telomerase activity, enhanced activation, and increased secretion of inflammatory cytokines. Importantly, oligoclonal expansions of these cells are associated with increased morbidity and mortality risk in elderly humans. Currently, most information on the adaptive immune system is derived from studies using peripheral blood, which contains approximately only 2% of total body lymphocytes...
2017: PloS One
https://www.readbyqxmd.com/read/28829048/maintenance-of-pd-1-on-brain-resident-memory-cd8-t-cells-is-antigen-independent
#14
Shwetank, Hossam A Abdelsamed, Elizabeth L Frost, Heather M Schmitz, Taryn E Mockus, Ben A Youngblood, Aron E Lukacher
Infection of the central nervous system (CNS) by murine polyomavirus (MuPyV), a persistent natural mouse pathogen, establishes brain-resident memory CD8 T cells (bTRM) that uniformly and chronically express programmed cell death protein 1 (PD-1) irrespective of the expression of αE integrin CD103, a TRM cell marker. In contrast, memory antiviral CD8 T cells in the spleen are PD-1(-), despite viral loads being similar in both the brain and spleen during persistent infection. Repetitive antigen engagement is central to sustained PD-1 expression by T cells in chronic viral infections; however, recent evidence indicates that expression of inhibitory receptors, including PD-1, is part of the TRM differentiation program...
August 22, 2017: Immunology and Cell Biology
https://www.readbyqxmd.com/read/28815584/maintenance-of-cd8-memory-t-lymphocytes-in-the-spleen-but-not-in-the-bone-marrow-is-dependent-on-proliferation
#15
Francesco Siracusa, Özen Sercan Alp, Patrick Maschmeyer, Mairi McGrath, Mir-Farzin Mashreghi, Shintaro Hojyo, Hyun-Dong Chang, Koji Tokoyoda, Andreas Radbruch
It is current belief that numbers of CD8 memory T lymphocytes in the memory phase of an immune response are maintained by homeostatic proliferation. Here we compare the proliferation of CD8 memory T lymphocytes, generated by natural infections and by intentional immunization, in spleen and in bone marrow. 50% of CD8 memory T lymphocytes in the spleen are eliminated by cyclophosphamide within 14 days, indicating that numbers of at least 50% of splenic CD8 memory T lymphocytes are maintained by proliferation...
August 16, 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/28814601/il-15-complexes-induce-migration-of-resting-memory-cd8-t-cells-into-mucosal-tissues
#16
Ryan T Sowell, Josef W Goldufsky, Magdalena Rogozinska, Zurisaday Quiles, Yanxia Cao, Eliseo F Castillo, Alison Finnegan, Amanda L Marzo
IL-15 is an essential cytokine known to promote T cell survival and activate the effector function of memory phenotype CD8 T cells. Blocking IL-15 signals also significantly impacts tissue-specific effector and memory CD8 T cell formation. In this study, we demonstrate that IL-15 influences the generation of memory CD8 T cells by first promoting their accumulation into mucosal tissues and second by sustaining expression of Bcl-6 and T-bet. We show that the mechanism for this recruitment is largely dependent on mammalian target of rapamycin and its subsequent inactivation of FoxO1...
October 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28783666/dynamics-of-influenza-induced-lung-resident-memory-t-cells-underlie-waning-heterosubtypic-immunity
#17
Bram Slütter, Natalija Van Braeckel-Budimir, Georges Abboud, Steven M Varga, Shahram Salek-Ardakani, John T Harty
Lung-resident memory CD8 T cells (TRM) induced by influenza A virus (IAV) that are pivotal for providing subtype-transcending protection against IAV infection (heterosubtypic immunity) are not maintained long term, causing gradual loss of protection. The short-lived nature of lung TRM contrasts sharply with long-term maintenance of TRM induced by localized infections in the skin and in other tissues. We show that the decline in lung TRM is determined by an imbalance between apoptosis and lung recruitment and conversion to TRM of circulating memory cells...
January 6, 2017: Science Immunology
https://www.readbyqxmd.com/read/28783656/resident-memory-cd8-t-cells-in-the-upper-respiratory-tract-prevent-pulmonary-influenza-virus-infection
#18
Angela Pizzolla, Thi H O Nguyen, Jeffrey M Smith, Andrew G Brooks, Katherine Kedzieska, William R Heath, Patrick C Reading, Linda M Wakim
Nasal epithelial tissue of the upper respiratory tract is the first site of contact by inhaled pathogens such as influenza virus. We show that this region is key to limiting viral spread to the lower respiratory tract and associated disease pathology. Immunization of the upper respiratory tract leads to the formation of local tissue-resident memory CD8(+) T cells (Trm cells). Unlike Trm cells in the lung, these cells develop independently of local cognate antigen recognition and transforming growth factor-β signaling and persist with minimal decay, representing a long-term protective population...
June 2, 2017: Science Immunology
https://www.readbyqxmd.com/read/28782508/circulating-and-tissue-resident-cd4-t-cells-with-reactivity-to-intestinal-microbiota-are-abundant-in-healthy-individuals-and-function-is-altered-during-inflammation
#19
Ahmed N Hegazy, Nathaniel R West, Michael J T Stubbington, Emily Wendt, Kim I M Suijker, Angeliki Datsi, Sebastien This, Camille Danne, Suzanne Campion, Sylvia H Duncan, Benjamin M J Owens, Holm H Uhlig, Andrew McMichael, Andreas Bergthaler, Sarah A Teichmann, Satish Keshav, Fiona Powrie
BACKGROUND & AIMS: Interactions between commensal microbes and the immune system are tightly regulated and maintain intestinal homeostasis, but little is known about these interactions in humans. We investigated responses of human CD4(+) T cells to the intestinal microbiota. We measured the abundance of T cells in circulation and intestinal tissues that respond to intestinal microbes and determined their clonal diversity. We also assessed their functional phenotypes and effects on intestinal resident cell populations, and studied alterations in microbe-reactive T cells in patients with chronic intestinal inflammation...
August 3, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28762530/high-proportion-of-pd-1-expressing-cd4-t-cells-in-adipose-tissue-constitutes-an-immunomodulatory-microenvironment-that-may-support-hiv-persistence
#20
Abderaouf Damouche, Guillaume Pourcher, Valérie Pourcher, Stéphane Benoist, Elodie Busson, Jean Jacques Lataillade, Mélanie Le Van, Thierry Lazure, Julien Adam, Benoit Favier, Bruno Vaslin, Michaela Müller-Trutwin, Olivier Lambotte, Christine Bourgeois
We and others have demonstrated that adipose tissue is a reservoir for HIV. Evaluation of the mechanisms responsible for viral persistence may lead to ways of reducing these reservoirs. Here, we evaluated the immune characteristics of adipose tissue in HIV-infected patients receiving antiretroviral therapy (ART) and in non-HIV-infected patients. We notably sought to determine whether adipose tissue's intrinsic properties and/or HIV induced alteration of the tissue environment may favour viral persistence. ART-controlled HIV infection was associated with a difference in the CD4/CD8 T-cell ratio and an elevated proportion of Treg cells in subcutaneous adipose tissue...
August 1, 2017: European Journal of Immunology
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