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https://www.readbyqxmd.com/read/28520792/myd88-signaling-in-dendritic-cells-and-the-intestinal-epithelium-controls-immunity-against-intestinal-infection-with-c-rodentium
#1
Christin Friedrich, Panagiota Mamareli, Sophie Thiemann, Friederike Kruse, Zuobai Wang, Bernhard Holzmann, Till Strowig, Tim Sparwasser, Matthias Lochner
MyD88-mediated signaling downstream of Toll-like receptors and the IL-1 receptor family is critically involved in the induction of protective host responses upon infections. Although it is known that MyD88-deficient mice are highly susceptible to a wide range of bacterial infections, the cell type-specific contribution of MyD88 in protecting the host against intestinal bacterial infection is only poorly understood. In order to investigate the importance of MyD88 in specific immune and nonimmune cell types during intestinal infection, we employed a novel murine knock-in model for MyD88 that enables the cell type-specific reactivation of functional MyD88 expression in otherwise MyD88-deficient mice...
May 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28504575/alleviation-of-enterotoxigenic-escherichia-coli-challenge-by-recombinant-lactobacillus-plantarum-expressing-a-faeg-and-dc-targeting-peptide-fusion-protein
#2
G Yang, Y Jiang, P Tong, C Li, W Yang, J Hu, L Ye, W Gu, C Shi, B Shan, C Wang
FaeG is the major subunit of K88 fimbriae. These cell surface attachments are considered to be the major virulence factor of enterotoxigenic Escherichia coli (ETEC), which causes diarrhoea in piglets. The use of dendritic cell-targeting peptide (DCpep) has been demonstrated to be an effective approach to enhance the immunity of vaccines. Lactobacillus plantarum is an attractive candidate for oral vaccination owing to its beneficial effects and safety. In this study, L. plantarum was employed to deliver a FaeG-DCpep fusion antigen, and the immune response in mice was evaluated...
May 15, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/28495789/dietary-nondigestible-oligosaccharides-and-bifidobacterium-breve-m-16v-suppress-allergic-inflammation-in-intestine-via-targeting-dendritic-cell-maturation
#3
Sander de Kivit, Atanaska I Kostadinova, JoAnn Kerperien, Mary E Morgan, Veronica Ayechu Muruzabal, Gerard A Hofman, Leon M J Knippels, Aletta D Kraneveld, Johan Garssen, Linette E M Willemsen
Dietary intervention with short-chain galacto-oligosaccharides (scGOS), long-chain fructo-oligosaccharides (lcFOS) and Bifidobacterium breve M-16V (Bb) (GF/Bb) suppresses food allergic symptoms in mice, potentially via intestinal epithelial cell (IEC)-derived galectin-9. Furthermore, in vitro studies showed galacto- and fructo-oligosaccharides (GF) to enhance the immunomodulatory capacity of a TLR9 ligand representing bacterial CpG DNA when exposed to IEC. In this study, we investigated whether GF/Bb modulates dendritic cells (DCs) and subsequent Th2 and regulatory T cell (Treg) frequency in the small intestinal lamina propria (SI-LP)...
May 11, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28479331/forkhead-box-protein-3-foxp3-demethylation-is-associated-with-tolerance-induction-in-peanut-induced-intestinal-allergy
#4
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/28426803/dendritic-cell-maturation-but-not-type-i-interferon-exposure-restricts-infection-by-htlv-1-and-viral-transmission-to-t-cells
#5
Gergès Rizkallah, Sandrine Alais, Nicolas Futsch, Yuetsu Tanaka, Chloé Journo, Renaud Mahieux, Hélène Dutartre
Human T lymphotropic Virus type 1 (HTLV-1) is the etiological agent of Adult T cell Leukemia/Lymphoma (ATLL) and HTLV-1-Associated Myelopathy/Tropical Spastic Paraparesis (HAM/TSP). Both CD4+ T-cells and dendritic cells (DCs) infected with HTLV-1 are found in peripheral blood from HTLV-1 carriers. We previously demonstrated that monocyte-derived IL-4 DCs are more susceptible to HTLV-1 infection than autologous primary T-cells, suggesting that DC infection precedes T-cell infection. However, during blood transmission, breast-feeding or sexual transmission, HTLV-1 may encounter different DC subsets present in the blood, the intestinal or genital mucosa respectively...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28423181/mesenteric-lymph-node-cd11b-cd103-pd-l1-high-dendritic-cells-highly-induce-regulatory-t-cells
#6
Aya Shiokawa, Ryutaro Kotaki, Tomohiro Takano, Haruyo Nakajima-Adachi, Satoshi Hachimura
Dendritic cells (DCs) in mesenteric lymph nodes (MLNs) induce Foxp3(+) regulatory T cells to regulate immune responses to beneficial or non-harmful agents in the intestine, such as commensal bacteria and foods. Several studies in MLN DCs have revealed that CD103(+) DC subset highly induces regulatory T cells, and another study has reported that MLN DCs from PD-L1-deficient mice could not induce regulatory T cells. Thus, the present study investigated expression of these molecules on MLN CD11c(+) cells. Four distinct subsets expressing CD103 and/or PD-L1 were identified, namely CD11b(+) CD103(+) PD-L1(High) , CD11b(-) CD103(+) PD-L1(High) , CD11b(-) CD103(+) PD-L1(Low) , and CD11b(+) CD103(-) PD-L1(Int...
April 19, 2017: Immunology
https://www.readbyqxmd.com/read/28412844/compounds-with-inhibitory-activity-on-peristalsis-from-the-seeds-of-holarrhena-antidysenterica
#7
Hai-Hua Xie, Jian Su, Xiao-Lei Ge, Ting-Ting Dong, Xin Li, Hui-Min Wen, Bo-Hang Sun
Eight compounds were isolated from the seeds of Holarrhena antidysenterica Wall.ex A.DC. On the basis of physico-chemical properties and spectroscopic data, holarrhenanan (1) was identified as a new compound, compounds 2-3 were isolated from H. antidysenterica for the first time, and five known compounds were also obtained. Inhibitory effects of some compounds and extracts to the intestinal peristalsis were evaluated. Results showed that the extracts and compounds 4, 6 exhibited remarkable inhibitory effects with tension inhibition rate of 32...
April 17, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28405506/oral-delivery-of-tumor-microparticle-vaccines-activates-nod2-signaling-pathway-in-ileac-epithelium-rendering-potent-antitumor-t-cell-immunity
#8
Wenqian Dong, Huafeng Zhang, Xiaonan Yin, Yuying Liu, Degao Chen, Xiaoyu Liang, Xun Jin, Jiadi Lv, Jingwei Ma, Ke Tang, Zhuowei Hu, Xiaofeng Qin, Bo Huang
Exploiting gut mucosal immunity to design new antitumor vaccination strategy remains unexplored. Tumor cell-derived microparticles (T-MP) are natural biomaterials that are capable of delivering tumor antigens and innate signals to dendritic cells (DC) for tumor-specific T cell immunity. Here, we show that T-MPs by oral vaccination route effectively access and activate mucosal epithelium, leading to subsequent antitumor T cell responses. Oral vaccination of T-MPs generated potent inhibitory effect against the growth of B16 melanoma and CT26 colon cancer in mice, which required both T cell and DC activation...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28392962/anti-diabetic-effects-of-an-ethanol-extract-of-cassia-abbreviata-stem-bark-on-diabetic-rats-and-possible-mechanism-of-its-action-anti-diabetic-properties-of-cassia-abbreviata
#9
Keagile Bati, Tebogo Elvis Kwape, Padmaja Chaturvedi
OBJECTIVES: This study aimed to evaluate the hypoglycemic effects of an ethanol extract of Cassia abbreviata (ECA) bark and the possible mechanisms of its action in diabetic albino rats. METHODS: ECA was prepared by soaking the powdered plant material in 70% ethanol. It was filtered and made solvent-free by evaporation on a rotary evaporator. Type 2 diabetes was induced in albino rats by injecting 35 mg/kg body weight (bw) of streptozotocin after having fed the rats a high-fat diet for 2 weeks...
March 2017: Journal of Pharmacopuncture
https://www.readbyqxmd.com/read/28342908/intestinal-dendritic-cell-licensing-through-toll-like-receptor-4-is-required-for-oral-tolerance-in-patients-with-allergic-contact-dermatitis
#10
Feriel Hacini-Rachinel, Mercedes Gomez de Agüero, Reem Kanjarawi, Ludovic Moro-Sibilot, Jean-Benoit Le Luduec, Claire Macari, Gilles Boschetti, Emilie Bardel, Philippe Langella, Bertrand Dubois, Dominique Kaiserlian
BACKGROUND: Induction of oral tolerance to haptens is an efficient way to prevent allergic contact dermatitis (ACD) in mice. Toll-like receptor (TLR)-mediated sensing of the microbiota contributes to gut homeostasis, yet whether it contributes to induction of oral tolerance has not been documented. OBJECTIVE: We examined whether oral tolerance to the contact sensitizer 2,4-dinitro-fluorobenzene (DNFB) depends on microbiota/TLRs and evaluated the role of TLR4 on the tolerogenic function of intestinal dendritic cells (DCs)...
March 22, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28338920/dendritic-cell-expression-of-the-signaling-molecule-traf6-is-required-for-immune-tolerance-in-the-lung
#11
Daehee Han, Matthew C Walsh, Kwang Soon Kim, Sung-Wook Hong, Junyoung Lee, Jaeu Yi, Gloriany Rivas, Yongwon Choi, Charles D Surh
Immune tolerance in the lung is important for preventing hypersensitivity, such as allergic asthma. Maintenance of tolerance in the lung is established by coordinated activities of poorly understood cellular and molecular mechanisms, including participation of dendritic cells (DCs). We have previously identified DC expression of the signaling molecule TRAF6 as a non-redundant requirement for the maintenance of immune tolerance in the small intestine of mice. Because mucosal tissues share similarities in how they interact with exogenous antigens, we examined the role of DC-expressed TRAF6 in the lung...
February 1, 2017: International Immunology
https://www.readbyqxmd.com/read/28336717/publisher-s-expression-of-concern-lactobacillus-bulgaricus-prevents-intestinal-epithelial-cell-injury-caused-by-enterobacter-sakazakii-induced-nitric-oxide-both-in-vitro-and-in-the-newborn-rat-model-of-necrotizing-enterocolitis
#12
https://www.readbyqxmd.com/read/28329707/dendritic-cells-display-subset-and-tissue-specific-maturation-dynamics-over-human-life
#13
Tomer Granot, Takashi Senda, Dustin J Carpenter, Nobuhide Matsuoka, Joshua Weiner, Claire L Gordon, Michelle Miron, Brahma V Kumar, Adam Griesemer, Siu-Hong Ho, Harvey Lerner, Joseph J C Thome, Thomas Connors, Boris Reizis, Donna L Farber
Maturation and migration to lymph nodes (LNs) constitutes a central paradigm in conventional dendritic cell (cDC) biology but remains poorly defined in humans. Using our organ donor tissue resource, we analyzed cDC subset distribution, maturation, and migration in mucosal tissues (lungs, intestines), associated lymph nodes (LNs), and other lymphoid sites from 78 individuals ranging from less than 1 year to 93 years of age. The distribution of cDC1 (CD141(hi)CD13(hi)) and cDC2 (Sirp-α(+)CD1c(+)) subsets was a function of tissue site and was conserved between donors...
March 21, 2017: Immunity
https://www.readbyqxmd.com/read/28329174/ccr7-deficiency-modulates-t-cell-response-and-increases-susceptibility-to-yersinia-pseudotuberculosis-infection
#14
Joern Pezoldt, Fabio Pisano, Wiebke Heine, Maria Pasztoi, Maik Rosenheinrich, Aaron M Nuss, Marina C Pils, Immo Prinz, Reinhold Förster, Jochen Huehn, Petra Dersch
Background: To successfully limit pathogen dissemination an immunological link between the entry tissue of the pathogen and the underlying secondary lymphoid organs (SLO) needs to be established to prime adaptive immune responses. Here, the prerequisite of CCR7 to mount host immune responses within SLOs during gastrointestinal Yersinia pseudotuberculosis infection to limit pathogen spread was investigated. Methods: Survival, bacterial dissemination, intestinal and systemic pathology of wild type (WT) and CCR7-/- mice were assessed and correlated to the presence of immune cell subsets and cytokine responses throughout the course of infection...
January 27, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28288769/construction-and-immunological-evaluation-of-recombinant-lactobacillus-plantarum-expressing-so7-of-eimeria-tenella-fusion-dc-targeting-peptide
#15
Guilian Yang, Jiayun Yao, Wentao Yang, Yanlong Jiang, Jinfen Du, Haibin Huang, Wei Gu, Jingtao Hu, Liping Ye, Chunwei Shi, Baolong Shan, Chunfeng Wang
The coccidiosis caused by Eimeria tenella (coccidian) and other species is a serious parasitic disease that affects the global poultry breeding industry. Lactobacillus strains exhibit a number of properties that make them attractive candidates as delivery vehicles for presentation to the mucosa of compounds with pharmaceutical interest, particularly vaccines. Here, the recombinant Lactobacillus plantarum (co-expressing SO7 and DCpep gene) was constructed, and its efficacy against E. tenella challenge was evaluated in this study...
March 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28274798/broccoli-derived-nanoparticle-inhibits-mouse-colitis-by-activating-dendritic-cell-amp-activated-protein-kinase
#16
Zhongbin Deng, Yuan Rong, Yun Teng, Jingyao Mu, Xiaoying Zhuang, Michael Tseng, Abhilash Samykutty, Lifeng Zhang, Jun Yan, Donald Miller, Jill Suttles, Huang-Ge Zhang
The intestinal immune system is continuously exposed to massive amounts of nanoparticles derived from food. Whether nanoparticles from plants we eat daily have a role in maintaining intestinal immune homeostasis is poorly defined. Here, we present evidence supporting our hypothesis that edible nanoparticles regulate intestinal immune homeostasis by targeting dendritic cells (DCs). Using three mouse colitis models, our data show that orally given nanoparticles isolated from broccoli extracts protect mice against colitis...
March 5, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28249594/enhancement-of-scutellarin-oral-delivery-efficacy-by-vitamin-b12-modified-amphiphilic-chitosan-derivatives-to-treat-type-ii-diabetes-induced-retinopathy
#17
Jingnan Wang, Jiayun Tan, Jiahao Luo, Peilin Huang, Wuyi Zhou, Luming Chen, Lingli Long, Li-Ming Zhang, Banghao Zhu, Liqun Yang, David Y B Deng
BACKGROUND: Diabetic retinopathy is the most common complication in diabetic patients relates to high expression of VEGF and microaneurysms. Scutellarin (Scu) turned out to be effective against diabetes related vascular endothelial cell dysfunction. However, its clinical applications have been limited by its low bioavailability. In this study, we formulated and characterized a novel intestinal target nanoparticle carrier based on amphiphilic chitosan derivatives (Chit-DC-VB12) loaded with scutellarin to enhance its bioavailability and then evaluated its therapeutic effect in experimental diabetic retinopathy model...
March 1, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28207890/mucosal-stromal-fibroblasts-markedly-enhance-hiv-infection-of-cd4-t-cells
#18
Jason A Neidleman, Joseph C Chen, Nargis Kohgadai, Janis A Müller, Anders Laustsen, Karthiga Thavachelvam, Karen S Jang, Christina M Stürzel, Jennifer J Jones, Christina Ochsenbauer, Avantika Chitre, Ma Somsouk, Maurice M Garcia, James F Smith, Ruth M Greenblatt, Jan Münch, Martin R Jakobsen, Linda C Giudice, Warner C Greene, Nadia R Roan
Understanding early events of HIV transmission within mucosal tissues is vital for developing effective prevention strategies. Here, we report that primary stromal fibroblasts isolated from endometrium, cervix, foreskin, male urethra, and intestines significantly increase HIV infection of CD4+ T cells-by up to 37-fold for R5-tropic HIV and 100-fold for X4-tropic HIV-without themselves becoming infected. Fibroblasts were more efficient than dendritic cells at trans-infection and mediate this response in the absence of the DC-SIGN and Siglec-1 receptors...
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28125560/o-012-il-36-signaling-controls-the-induced-regulatory-t-cell-th9-cell-balance-and-gut-inflammation
#19
Akihito Harusato, Hirohito Abo, Vu Ngo, Samuel Yi, Satoru Osuka, Jakob Kohlmeier, Jian-Dong Li, Andrew Gewirtz, Asma Nusrat, Timothy Denning
BACKGROUND: In the United States over 1.4 million people suffer from inflammatory bowel disease (IBD). Therefore, there is a pressing need for the development of novel molecular therapeutics targeting pro-inflammatory mediators. Recently a novel interleukin-1 family member, IL-36γ was shown to be up-regulated in patients with inflammatory bowel disease (IBD) and to play an important role in healing of acute intestinal damage in mice, however, the function of IL-36γ with regards to T helper (TH) cell differentiation during gut inflammation remains undefined...
February 2017: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/27966553/microbiota-metabolite-short-chain-fatty-acid-acetate-promotes-intestinal-iga-response-to-microbiota-which-is-mediated-by-gpr43
#20
W Wu, M Sun, F Chen, A T Cao, H Liu, Y Zhao, X Huang, Y Xiao, S Yao, Q Zhao, Z Liu, Y Cong
Intestinal IgA, which is regulated by gut microbiota, has a crucial role in maintenance of intestinal homeostasis and in protecting the intestines from inflammation. However, the means by which microbiota promotes intestinal IgA responses remain unclear. Emerging evidence suggests that the host can sense gut bacterial metabolites in addition to pathogen-associated molecular patterns and that recognition of these small molecules influences host immune response in the intestines and beyond. We reported here that microbiota metabolite short-chain fatty acid acetate promoted intestinal IgA responses, which was mediated by "metabolite-sensing" GPR43...
December 14, 2016: Mucosal Immunology
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