journal
MENU ▼
Read by QxMD icon Read
search

Journal of Immunology: Official Journal of the American Association of Immunologists

journal
https://www.readbyqxmd.com/read/28539433/slc46-family-transporters-facilitate-cytosolic-innate-immune-recognition-of-monomeric-peptidoglycans
#1
Donggi Paik, Amanda Monahan, Daniel R Caffrey, Roland Elling, William E Goldman, Neal Silverman
Tracheal cytotoxin (TCT), a monomer of DAP-type peptidoglycan from Bordetella pertussis, causes cytopathology in the respiratory epithelia of mammals and robustly triggers the Drosophila Imd pathway. PGRP-LE, a cytosolic innate immune sensor in Drosophila, directly recognizes TCT and triggers the Imd pathway, yet the mechanisms by which TCT accesses the cytosol are poorly understood. In this study, we report that CG8046, a Drosophila SLC46 family transporter, is a novel transporter facilitating cytosolic recognition of TCT, and plays a crucial role in protecting flies against systemic Escherichia coli infection...
May 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28539432/golgi-associated-protein-kinase-c-%C3%AE%C2%B5-is-delivered-to-phagocytic-cups-role-of-phosphatidylinositol-4-phosphate
#2
Cheryl M Hanes, Anna E D'Amico, Takehiko Ueyama, Alexander C Wong, Xuexin Zhang, W Frederick Hynes, Margarida M Barroso, Nathaniel C Cady, Mohamed Trebak, Naoaki Saito, Michelle R Lennartz
Protein kinase C-ε (PKC-ε) at phagocytic cups mediates the membrane fusion necessary for efficient IgG-mediated phagocytosis. The C1B and pseudosubstrate (εPS) domains are necessary and sufficient for this concentration. C1B binds diacylglycerol; the docking partner for εPS is unknown. Liposome assays revealed that the εPS binds phosphatidylinositol 4-phosphate (PI4P) and PI(3,5)P2 Wortmannin, but not LY294002, inhibits PKC-ε concentration at cups and significantly reduces the rate of phagocytosis. As Wortmannin inhibits PI4 kinase, we hypothesized that PI4P mediates the PKC-ε concentration at cups and the rate of phagocytosis...
May 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28539431/selective-induction-of-homeostatic-th17-cells-in-the-murine-intestine-by-cholera-toxin-interacting-with-the-microbiota
#3
Qing Zhao, Stacey N Harbour, Raivo Kolde, Isabel J Latorre, Hein M Tun, Trenton R Schoeb, Henrietta Turner, James J Moon, Ehsan Khafipour, Ramnik J Xavier, Casey T Weaver, Charles O Elson
Th17 cells play a role as an inflammation mediator in a variety of autoimmune disorders, including inflammatory bowel disease, and thus are widely considered to be pathogenic. However, Th17 cells are present in the normal intestine and show a homeostatic phenotype; that is, they participate in the maintenance of intestinal homeostasis rather than inducing inflammation. We observed an enlarged Th17 population in the small intestine of C57BL/6.IgA(-/-) mice compared with wild-type mice, which was further amplified with cholera toxin (CT) immunization without causing intestinal inflammation...
May 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28539430/physiologic-thymic-involution-underlies-age-dependent-accumulation-of-senescence-associated-cd4-t-cells
#4
Kyosuke Sato, Aiko Kato, Miho Sekai, Yoko Hamazaki, Nagahiro Minato
Immune aging may underlie various aging-related disorders, including diminished resistance to infection, chronic inflammatory disorders, and autoimmunity. PD-1(+) and CD153(+) CD44(high) CD4(+) T cells with features of cellular senescence, termed senescence-associated T (SA-T) cells, increasingly accumulate with age and may play a role in the immune aging phenotype. In this article, we demonstrate that, compared with young mice, the aged mouse environment is highly permissive for spontaneous proliferation of transferred naive CD4(+) T cells, and it drives their transition to PD-1(+) and CD153(+) CD44(high) CD4(+) T cells after extensive cell divisions...
May 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28539429/bolstering-the-number-and-function-of-hsv-1-specific-cd8-effector-memory-t-cells-and-tissue-resident-memory-t-cells-in-latently-infected-trigeminal-ganglia-reduces-recurrent-ocular-herpes-infection-and-disease
#5
Arif A Khan, Ruchi Srivastava, Aziz A Chentoufi, Elizabeth Kritzer, Sravya Chilukuri, Sumit Garg, David C Yu, Hawa Vahed, Lei Huang, Sabrina A Syed, Julie N Furness, Tien T Tran, Nesburn B Anthony, Christine E McLaren, John Sidney, Alessandro Sette, Randolph J Noelle, Lbachir BenMohamed
HSV type 1 (HSV-1) is a prevalent human pathogen that infects >3.72 billion individuals worldwide and can cause potentially blinding recurrent corneal herpetic disease. HSV-1 establishes latency within sensory neurons of trigeminal ganglia (TG), and TG-resident CD8(+) T cells play a critical role in preventing its reactivation. The repertoire, phenotype, and function of protective CD8(+) T cells are unknown. Bolstering the apparent feeble numbers of CD8(+) T cells in TG remains a challenge for immunotherapeutic strategies...
May 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28539428/cutting-edge-dual-tcr%C3%AE-expression-poses-an-autoimmune-hazard-by-limiting-regulatory-t-cell-generation
#6
Nathaniel J Schuldt, Jennifer L Auger, Justin A Spanier, Tijana Martinov, Elise R Breed, Brian T Fife, Kristin A Hogquist, Bryce A Binstadt
Despite accounting for 10-30% of the T cell population in mice and humans, the role of dual TCR-expressing T cells in immunity remains poorly understood. It has been hypothesized that dual TCR T cells pose an autoimmune hazard by allowing self-reactive TCRs to escape thymic selection. We revisited this hypothesis using the NOD murine model of type 1 diabetes. We bred NOD mice hemizygous at both TCRα and β (TCRα(+/-) β(+/-)) loci, rendering them incapable of producing dual TCR T cells. We found that the lack of dual TCRα expression skewed the insulin-specific thymocyte population toward greater regulatory T (Treg) cell commitment, resulting in a more tolerogenic Treg to conventional T cell ratio and protection from diabetes...
May 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28539427/tlr-induced-murine-dendritic-cell-dc-activation-requires-dc-intrinsic-complement
#7
Joong-Hyuk Sheen, Michael G Strainic, Jinbo Liu, Weijia Zhang, Zhengzi Yi, M Edward Medof, Peter S Heeger
Induction of proinflammatory T cell immunity is augmented by innate dendritic cell (DC) maturation commonly initiated by TLR signaling. We demonstrate that ligation of TLR3, TLR4, and TLR9 induces murine DC production of complement components and local production of the anaphylatoxin C5a. In vitro, ex vivo, and in vivo analyses show that TLR-induced DC maturation, as assessed by surface phenotype, expression profiling by gene array, and functional ability to stimulate T cell responses, requires autocrine C3a receptor and C5a receptor (C3ar1/C5ar1) signaling...
May 24, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28533445/lung-cd4-tissue-resident-memory-t-cells-mediate-adaptive-immunity-induced-by-previous-infection-of-mice-with-bordetella-pertussis
#8
Mieszko M Wilk, Alicja Misiak, Róisín M McManus, Aideen C Allen, Marina A Lynch, Kingston H G Mills
Th1 and Th17 cells have an established role in protective immunity to Bordetella pertussis, but this evidence is based largely on peripheral T cells. There is emerging evidence that local tissue-resident memory T (TRM) cells that accumulate in tissue following mucosal infection may be crucial for long-term immunity. In this study, we examined the role of respiratory CD4 TRM cells in immunity to B. pertussis Natural immunity to B. pertussis induced by infection is considered long lasting and effective at preventing reinfection...
May 22, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28533444/t-follicular-helper-cell-derived-il-4-is-required-for-ige-production-during-intestinal-helminth-infection
#9
Alexandre P Meli, Ghislaine Fontés, Cindy Leung Soo, Irah L King
IgE production plays a crucial role in protective as well as pathogenic type 2 immune responses. Although the cytokine IL-4 is required for the development of IgE-producing plasma cells, the source of IL-4 and cellular requirements for optimal IgE responses remain unclear. Recent evidence suggests that T follicular helper (Tfh) cells are the primary producer of IL-4 in the reactive lymph node during type 2 immune responses. As Tfh cells are also required for the development of plasmablasts derived from germinal center and extrafollicular sources, we hypothesized that this cell subset is essential for the IgE plasmablast response...
May 22, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28533443/fhr-1-binds-to-c-reactive-protein-and-enhances-rather-than-inhibits-complement-activation
#10
Ádám I Csincsi, Zsóka Szabó, Zsófia Bánlaki, Barbara Uzonyi, Marcell Cserhalmi, Éva Kárpáti, Agustín Tortajada, Joseph J E Caesar, Zoltán Prohászka, T Sakari Jokiranta, Susan M Lea, Santiago Rodríguez de Córdoba, Mihály Józsi
Factor H-related protein (FHR) 1 is one of the five human FHRs that share sequence and structural homology with the alternative pathway complement inhibitor FH. Genetic studies on disease associations and functional analyses indicate that FHR-1 enhances complement activation by competitive inhibition of FH binding to some surfaces and immune proteins. We have recently shown that FHR-1 binds to pentraxin 3. In this study, our aim was to investigate whether FHR-1 binds to another pentraxin, C-reactive protein (CRP), analyze the functional relevance of this interaction, and study the role of FHR-1 in complement activation and regulation...
May 22, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28533442/the-role-of-shed-prp-c-in-the-neuropathogenesis-of-hiv-infection
#11
Bezawit W Megra, Eliseo A Eugenin, Joan W Berman
HIV-1 enters the CNS soon after peripheral infection and causes chronic neuroinflammation and neuronal damage that leads to cognitive impairment in 40-70% of HIV-infected people. The nonpathogenic cellular isoform of the human prion protein (PrP(c)) is an adhesion molecule constitutively expressed in the CNS. Previously, our laboratory showed that shed PrP(c) (sPrP(c)) is increased in the cerebrospinal fluid of HIV-infected people with cognitive deficits as compared with infected people with no impairment. In this article, we demonstrate that CCL2 and TNF-α, inflammatory mediators that are elevated in the CNS of HIV-infected people, increase shedding of PrP(c) from human astrocytes by increasing the active form of the metalloprotease ADAM10...
May 22, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28526683/autoreactivity-to-sulfatide-by-human-invariant-nkt-cells
#12
Annelein M Stax, Jessica Tuengel, Enrico Girardi, Naoki Kitano, Lenka L Allan, Victor Liu, Dongjun Zheng, William J Panenka, Joren Guillaume, Chi-Huey Wong, Serge van Calenbergh, Dirk M Zajonc, Peter van den Elzen
Invariant NKT (iNKT) cells are innate-like lymphocytes that recognize lipid Ags presented by CD1d. The prototypical Ag, α-galactosylceramide, strongly activates human and mouse iNKT cells, leading to the assumption that iNKT cell physiology in human and mouse is similar. In this article, we report the surprising finding that human, but not mouse, iNKT cells directly recognize myelin-derived sulfatide presented by CD1d. We propose that sulfatide is recognized only by human iNKT cells because of the unique positioning of the 3-O-sulfated β-galactose headgroup...
May 19, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28526682/aeroallergens-induce-reactive-oxygen-species-production-and-dna-damage-and-dampen-antioxidant-responses-in-bronchial-epithelial-cells
#13
Tze Khee Chan, W S Daniel Tan, Hong Yong Peh, W S Fred Wong
Exposure to environmental allergens is a major risk factor for asthma development. Allergens possess proteolytic activity that is capable of disrupting the airway epithelium. Although there is increasing evidence pointing to asthma as an epithelial disease, the underlying mechanism that drives asthma has not been fully elucidated. In this study, we investigated the direct DNA damage potential of aeroallergens on human bronchial epithelial cells and elucidated the mechanisms mediating the damage. Human bronchial epithelial cells, BEAS-2B, directly exposed to house dust mites (HDM) resulted in enhanced DNA damage, as measured by the CometChip and the staining of DNA double-strand break marker, γH2AX...
May 19, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28526681/adoptive-transfer-of-phosphoantigen-specific-%C3%AE-%C3%AE-t-cell-subset-attenuates-mycobacterium-tuberculosis-infection-in-nonhuman-primates
#14
Arwa Qaqish, Dan Huang, Crystal Y Chen, Zhuoran Zhang, Richard Wang, Shengpu Li, Enzhuoa Yang, Yang Lu, Michelle H Larsen, William R Jacobs, Lixia Qian, James Frencher, Ling Shen, Zheng W Chen
The dominant Vγ2Vδ2 T cell subset recognizes phosphoantigen and exists only in humans and nonhuman primates. Despite the discovery of γδ T cells >30 y ago, a proof-of-concept study has not been done to prove the principle that the Vγ2Vδ2 T cell subset is protective against Mycobacterium tuberculosis and other infections. In this study, we used an adoptive cell-transfer strategy to define the protective role of Vγ2Vδ2 T cells in a primate tuberculosis (TB) model. Vγ2Vδ2 T cells for adoptive transfer displayed central/effector memory and mounted effector functions, including the production of anti-M...
May 19, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28526680/decrease-in-numbers-of-naive-and-resting-b-cells-in-hiv-infected-kenyan-adults-leads-to-a-proportional-increase-in-total-and-plasmodium-falciparum-specific-atypical-memory-b-cells
#15
Anne E Frosch, Oludare A Odumade, Justin J Taylor, Kathleen Ireland, George Ayodo, Bartholomew Ondigo, David L Narum, John Vulule, Chandy C John
Human immunodeficiency virus type 1 (HIV-1) infection is associated with B cell activation and exhaustion, and hypergammaglobulinemia. How these changes influence B cell responses to coinfections such as malaria is poorly understood. To address this, we compared B cell phenotypes and Abs specific for the Plasmodium falciparum vaccine candidate apical membrane Ag-1 (AMA1) in HIV-infected and uninfected adults living in Kenya. Surprisingly, HIV-1 infection was not associated with a difference in serum AMA1-specific Ab levels...
May 19, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28515282/talin-plays-a-critical-role-in-the-maintenance-of-the-regulatory-t-cell-pool
#16
Jane E Klann, Kelly A Remedios, Stephanie H Kim, Patrick J Metz, Justine Lopez, Lauren A Mack, Ye Zheng, Mark H Ginsberg, Brian G Petrich, John T Chang
Talin, a cytoskeletal protein essential in mediating integrin activation, has been previously shown to be involved in the regulation of T cell proliferation and function. In this study, we describe a role for talin in maintaining the homeostasis and survival of the regulatory T (Treg) cell pool. T cell-specific deletion of talin in Tln1(fl/fl)Cd4(Cre) mice resulted in spontaneous lymphocyte activation, primarily due to numerical and functional deficiencies of Treg cells in the periphery. Peripheral talin-deficient Treg cells were unable to maintain high expression of IL-2Rα, resulting in impaired IL-2 signaling and ultimately leading to increased apoptosis through downregulation of prosurvival proteins Bcl-2 and Mcl-1...
May 17, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28515281/cxcl4-exposure-potentiates-tlr-driven-polarization-of-human-monocyte-derived-dendritic-cells-and-increases-stimulation-of-t-cells
#17
Sandra C Silva-Cardoso, Alsya J Affandi, Lotte Spel, Marta Cossu, Joel A G van Roon, Marianne Boes, Timothy R D J Radstake
Chemokines have been shown to play immune-modulatory functions unrelated to steering cell migration. CXCL4 is a chemokine abundantly produced by activated platelets and immune cells. Increased levels of circulating CXCL4 are associated with immune-mediated conditions, including systemic sclerosis. Considering the central role of dendritic cells (DCs) in immune activation, in this article we addressed the effect of CXCL4 on the phenotype and function of monocyte-derived DCs (moDCs). To this end, we compared innate and adaptive immune responses of moDCs with those that were differentiated in the presence of CXCL4...
May 17, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28515280/airway-epithelial-cells-are-crucial-targets-of-glucocorticoids-in-a-mouse-model-of-allergic-asthma
#18
Carina Klaßen, Anna Karabinskaya, Lien Dejager, Sabine Vettorazzi, Justine Van Moorleghem, Fred Lühder, Sebastiaan H Meijsing, Jan P Tuckermann, Hanibal Bohnenberger, Claude Libert, Holger M Reichardt
Although glucocorticoids (GCs) are a mainstay in the clinical management of asthma, the target cells that mediate their therapeutic effects are unknown. Contrary to our expectation, we found that GC receptor (GR) expression in immune cells was dispensable for successful therapy of allergic airway inflammation (AAI) with dexamethasone. Instead, GC treatment was compromised in mice expressing a defective GR in the nonhematopoietic compartment or selectively lacking the GR in airway epithelial cells. Further, we found that an intact GR dimerization interface was a prerequisite for the suppression of AAI and airway hyperresponsiveness by GCs...
May 17, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28515279/regulatory-eosinophils-suppress-t-cells-partly-through-galectin-10
#19
Christine Lingblom, Jennie Andersson, Kerstin Andersson, Christine Wennerås
Eosinophils have the capacity to regulate the function of T cell subsets. Our aim was to test the hypothesis of the existence of a regulatory subset of eosinophils. Human eosinophils were incubated with T cells that were stimulated with allogeneic leukocytes or CD3/CD28 cross-linking. After 2 d of coculture, 11% of the eosinophils gained CD16 expression. A CD16(hi) subset of eosinophils, encompassing 1-5% of all eosinophils, was also identified in the blood of healthy subjects. FACS sorting showed that these CD16(hi) eosinophils were significantly stronger suppressors of T cell proliferation than were conventional CD16(neg) eosinophils...
May 17, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28515278/critical-role-of-p2y12-receptor-in-regulation-of-th17-differentiation-and-experimental-autoimmune-encephalomyelitis-pathogenesis
#20
Chaoyan Qin, Jinfeng Zhou, Yuan Gao, Weiming Lai, Cuixia Yang, Yingying Cai, Shuai Chen, Changsheng Du
Adenosine 5'-diphosphate is a key endogenous cell-signaling molecule that can activate P2 purinergic receptor family members. ADP-P2Y signaling is reported to be associated with inflammation, but its function in T cell differentiation and autoimmune diseases pathogenesis is unclear. In this study, we found that the P2Y12 receptor was upregulated in the peripheral immune tissues of experimental autoimmune encephalomyelitis (EAE) mice. Deficiency of P2Y12 led to a reduced peak severity and cumulative disease score in EAE mice, followed by a dramatic reduction of leukocyte infiltration and less extensive demyelination...
May 17, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
journal
journal
25537
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"