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https://www.readbyqxmd.com/read/28545061/microbiota-induced-peritrophic-matrix-regulates-midgut-homeostasis-and-prevents-systemic-infection-of-malaria-vector-mosquitoes
#1
Faye H Rodgers, Mathilde Gendrin, Claudia A S Wyer, George K Christophides
Manipulation of the mosquito gut microbiota can lay the foundations for novel methods for disease transmission control. Mosquito blood feeding triggers a significant, transient increase of the gut microbiota, but little is known about the mechanisms by which the mosquito controls this bacterial growth whilst limiting inflammation of the gut epithelium. Here, we investigate the gut epithelial response to the changing microbiota load upon blood feeding in the malaria vector Anopheles coluzzii. We show that the synthesis and integrity of the peritrophic matrix, which physically separates the gut epithelium from its luminal contents, is microbiota dependent...
May 17, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28544984/histo-blood-group-antigens-as-mediators-of-infections
#2
REVIEW
Julie E Heggelund, Annabelle Varrot, Anne Imberty, Ute Krengel
The critical first step of a microbial infection is usually the attachment of pathogens to host cell glycans. Targets on host tissues are in particular the histo-blood group antigens (HBGAs), which are present in rich diversity in the mucus layer and on the underlying mucosa. Recent structural and functional studies have revealed significant new insight into the molecular mechanisms, explaining why individuals with certain blood groups are at increased risk of some infections. The most prominent example of blood-group-associated diseases is cholera, caused by infection with Vibrio cholerae...
May 22, 2017: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/28544688/prolonged-denervation-induces-remodeling-of-nasal-mucosa-in-rat-model-of-posterior-nasal-neurectomy
#3
Hironobu Nishijima, Kenji Kondo, Makiko Toma-Hirano, Shu Kikuta, Mizuo Ando, Rumi Ueha, Tatsuya Yamasoba
BACKGROUND: The posterior nasal nerve is the dominant source of the parasympathetic, sympathetic, and sensory fibers that innervate the nasal respiratory mucosa. Therefore, a posterior nasal neurectomy (PNN) induces denervation of the nasal mucosa and relieves the nasal symptoms of intractable rhinitis. PNN depletes nerve fibers, choline acetyltransferase, and neuropeptides in nasal respiratory mucosa, and reduces nasal secretion. However, the histological and symptomatic changes over an extended period after PNN remain unknown...
May 23, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28543437/the-adenoid-its-history-and-a-cautionary-tale
#4
Robert J Ruben
The existence of the adenoid first appears to have been noted by Conrad Victor Schneider in 1661. James Yearsley reported in 1842 one case in which he improved hearing by removal of a mucus membrane from behind the uvula, which indicates some appreciation of a relationship of the nasopharynx to ear disease. Hans Wilhelm Meyer, in 1868, was the first to demonstrate the relationship of the adenoid to ear disease and to develop an effective, although somewhat difficult, surgical operation to remove the adenoid...
June 2017: Laryngoscope
https://www.readbyqxmd.com/read/28543283/targeting-pp2a-and-proteasome-activity-ameliorates-features-of-allergic-airway-disease-in-mice
#5
Prema M Nair, Malcolm R Starkey, Tatt Jhong Haw, Gang Liu, Jay C Horvat, Jonathan C Morris, Nikki M Verrills, Andrew R Clark, Alaina J Ammit, Philip M Hansbro
BACKGROUND: Asthma is an allergic airway disease (AAD) caused by aberrant immune responses to allergens. Protein phosphatase-2A (PP2A) is an abundant serine/threonine phosphatase with anti-inflammatory activity. The ubiquitin proteasome system (UPS) controls many cellular processes, including the initiation of inflammatory responses by protein degradation. We assessed if enhancing PP2A activity with Fingolimod (FTY720) or 2-amino-4-(4-(heptyloxy) phenyl)-2-methylbutan-1-ol (AAL(S) ), or inhibiting proteasome activity with Bortezomib (BORT) could suppress experimental AAD...
May 24, 2017: Allergy
https://www.readbyqxmd.com/read/28540425/contribution-of-plasmid-encoded-peptidase-s8-prtp-to-adhesion-and-transit-in-the-gut-of-lactococcus-lactis-ibb477-strain
#6
Joanna Maria Radziwill-Bienkowska, Véronique Robert, Karolina Drabot, Florian Chain, Claire Cherbuy, Philippe Langella, Muriel Thomas, Jacek Karol Bardowski, Muriel Mercier-Bonin, Magdalena Kowalczyk
The ability of Lactococcus lactis to adhere to the intestinal mucosa can potentially prolong the contact with the host, and therefore favour its persistence in the gut. In the present study, the contribution of plasmid-encoded factors to the adhesive and transit properties of the L. lactis subsp. cremoris IBB477 strain was investigated. Plasmid-cured derivatives as well as deletion mutants were obtained and analysed. Adhesion tests were performed using non-coated polystyrene plates, plates coated with mucin or fibronectin and mucus-secreting HT29-MTX intestinal epithelial cells...
May 24, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28539224/inhaled-enac-antisense-oligonucleotide-ameliorates-cystic-fibrosis-like-lung-disease-in-mice
#7
Jeff R Crosby, Chenguang Zhao, Chong Jiang, Dong Bai, Melanie Katz, Sarah Greenlee, Hiroshi Kawabe, Michael McCaleb, Daniela Rotin, Shuling Guo, Brett P Monia
BACKGROUND: Epithelial sodium channel (ENaC, Scnn1) hyperactivity in the lung leads to airway surface dehydration and mucus accumulation in cystic fibrosis (CF) patients and in mice with CF-like lung disease. METHODS: We identified several potent ENaC specific antisense oligonucleotides (ASOs) and tested them by inhalation in mouse models of CF-like lung disease. RESULTS: The inhaled ASOs distributed into lung airway epithelial cells and decreased ENaC expression by inducing RNase H1-dependent degradation of the targeted Scnn1a mRNA...
May 20, 2017: Journal of Cystic Fibrosis: Official Journal of the European Cystic Fibrosis Society
https://www.readbyqxmd.com/read/28533470/aeromonas-salmonicida-growth-in-response-to-atlantic-salmon-mucins-differ-between-epithelial-sites-is-governed-by-sialylated-and-n-acetylhexosamine-containing-o-glycans-and-is-affected-by-ca-2
#8
János Tamás Padra, Henrik Sundh, Kristina Sundell, Vignesh Venkatakrishnan, Chunsheng Jin, Tore Samuelsson, Niclas G Karlsson, Sara K Lindén
Aeromonas salmonicida cause furunculosis in salmonids and is a threat to Atlantic salmon aquaculture. The epithelial surfaces that the pathogen colonizes are covered by a mucus layer, predominantly comprised of secreted mucins. Using mass spectrometry to identify mucin glycan structures with and without enzymatic removal of glycan residues, coupled to measurements of bacterial growth, we here show that the complex Atlantic salmon intestinal mucin glycans enhance A. salmonicida growth, whereas the more simple skin mucin glycans do not...
May 22, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28533178/mucin-and-carbohydrate-stimulated-adhesion-and-subproteome-changes-of-the-probiotic-bacterium-lactobacillus-acidophilus-ncfm
#9
Hasan Ufuk Celebioglu, Sita Vaag Olesen, Kennie Prehn, Sampo J Lahtinen, Susanne Brix, Maher Abou Hachem, Birte Svensson
Adhesion to intestinal mucosa is a crucial property for probiotic bacteria. Adhesion is thought to increase host-bacterial interactions, thus potentially enabling health benefits to the host. Molecular events connected with adhesion and surface proteome changes were investigated for the probiotic Lactobacillus acidophilus NCFM cultured with established or emerging prebiotic carbohydrates as carbon source and in the presence of mucin, the glycoprotein of the epithelial mucus layer. Variation in adhesion to HT29-cells and mucin was associated with carbon source and mucin-induced subproteome abundancy differences...
May 19, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28531919/bupleurum-chinense-extract-ameliorates-an-ova-induced-murine-allergic-asthma-through-the-reduction-of-the-th2-and-th17-cytokines-production-by-inactivation-of-nf%C3%AE%C2%BAb-pathway
#10
Thi Tho Bui, Chun Hua Piao, Chang Ho Song, Hee Soon Shin, Ok Hee Chai
Bupleurum chinense belongs to the Bupleurum spp. family that has been used in traditional herbal medicine for over thousand years. It has been reported to have anti-inflammatory, anti-oxidant, hepato-protective, antipyretic, analgesic, anti-fibrotic and immunomodulatory effect. However, the effect of B. Chinense on allergic asthma remains unclear. This study investigated the immunomodulatory effects of B. Chinense extracts (BCE) on airway inflammation in asthmatic mice model. In the ovalbumin (OVA)-induced allergic asthma model, we evaluated the number of total cells, differential inflammatory cells and the production of proinflammatory cytokines in bronchoalveolar lavage fluid (BALF) and lung homogenate as well as histological structure...
May 16, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28531184/bacarena-individual-based-metabolic-modeling-of-heterogeneous-microbes-in-complex-communities
#11
Eugen Bauer, Johannes Zimmermann, Federico Baldini, Ines Thiele, Christoph Kaleta
Recent advances focusing on the metabolic interactions within and between cellular populations have emphasized the importance of microbial communities for human health. Constraint-based modeling, with flux balance analysis in particular, has been established as a key approach for studying microbial metabolism, whereas individual-based modeling has been commonly used to study complex dynamics between interacting organisms. In this study, we combine both techniques into the R package BacArena (https://cran.r-project...
May 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28530849/allergic-bronchopulmonary-aspergillosis-in-cystic-fibrosis-mr-imaging-of-airway-mucus-contrasts-as-a-tool-for-diagnosis
#12
Gaël Dournes, Patrick Berger, John Refait, Julie Macey, Stephanie Bui, Laurence Delhaes, Michel Montaudon, Olivier Corneloup, Jean-François Chateil, Roger Marthan, Michaël Fayon, François Laurent
Purpose To assess the diagnostic accuracy of mucus contrast characterization by using magnetic resonance (MR) imaging to discriminate allergic bronchopulmonary aspergillosis (ABPA) in cystic fibrosis (CF). Materials and Methods The study was approved by the local Ethics Committee, and all patients or their parents gave written informed consent. One hundred ten consecutive patients with CF were screened between January 2014 and July 2015. All patients underwent a non-contrast material-enhanced MR protocol that included routine T1-weighted and T2-weighted sequences...
May 22, 2017: Radiology
https://www.readbyqxmd.com/read/28530777/clinicopathological-analysis-of-patients-operated-for-appendiceal-mucocele
#13
Hasan Abuoğlu, Mehmet Kamil Yıldız, Bülent Kaya, Mehmet Odabaşı
BACKGROUND: The term mucocele refers to the dilatation of the appendix due to mucus, and it is an uncommon disorder with an estimated incidence of 0.2%-0.3% of all appendectomies performed and 8%-10% of all appendiceal tumors. It is often asymptomatic, but may manifest appendicitis-like symptoms. METHODS: Twenty-six patients (14 females and 12 males) were operated on due to mucocele of the appendix. Sixteen patients exhibiting the characteristics of clinically acute appendicitis required an emergency operation...
May 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/28529457/deguelin-attenuates-allergic-airway-inflammation-via-inhibition-of-nf-%C3%AE%C2%BAb-pathway-in-mice
#14
Zhang Bao, Pei Zhang, Yinan Yao, Guohua Lu, Zhongkai Tong, Bing Yan, Lingfang Tu, Guangdie Yang, Jianying Zhou
Asthma is a chronic respiratory disease characterized by airway inflammation and remodeling, resulting in a substantial economic burden on both patients and society. Deguelin, a constituent of the Leguminosae family, exhibits anti-proliferative and anti-inflammatory activities in cancer mice models via inhibiting phosphatidylinositol 3-kinases and the NF-κB pathway. We demonstrated that deguelin effectively reduced OVA-induced inflammatory cell recruitment, decreased lung tissue inflammation and mucus production, suppressed airway hyperresponsiveness, and inhibited serum immunoglobulin and Th2 cytokine levels in a dose-dependent manner in asthmatic mice...
2017: International Journal of Biological Sciences
https://www.readbyqxmd.com/read/28526748/the-sialate-o-acetylesterase-esta-from-gut-bacteroidetes-species-enables-sialidase-mediated-cross-species-foraging-of-9-o-acetylated-sialoglycans
#15
Lloyd S Robinson, Warren G Lewis, Amanda L Lewis
The gut harbors many symbiotic, commensal, and pathogenic microbes that engage in the breakdown and metabolism of host carbohydrates. Sialic acids are prominent outermost carbohydrates on mucins and protect underlying glycan chains from enzymatic degradation. Sialidases produced by some members of the colonic microbiota have been shown to promote the expansion of several potential pathogens (e.g. Clostridium difficile, Salmonella, Escherichia coli) that do not produce sialidases. O-acetyl ester modifications of sialic acids help resist the action of many sialidases and are found at high levels in the mammalian colon...
May 19, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28518116/the-wincf-model-an-inexpensive-and-tractable-microcosm-of-a-mucus-plugged-bronchiole-to-study-the-microbiology-of-lung-infections
#16
William J Comstock, Edwin Huh, Reiley Weekes, Connor Watson, Tianyang Xu, Pieter C Dorrestein, Robert A Quinn
Many chronic airway diseases result in mucus plugging of the airways. Lungs of an individual with cystic fibrosis are an exemplary case where their mucus-plugged bronchioles create a favorable habitat for microbial colonization. Various pathogens thrive in this environment interacting with each other and driving many of the symptoms associated with CF disease. Like any microbial community, the chemical conditions of their habitat have a significant impact on the community structure and dynamics. For example, different microorganisms thrive in differing levels of oxygen or other solute concentrations...
May 8, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28512779/structure-of-protein-emulsion-in-food-impacts-intestinal-microbiota-caecal-luminal-content-composition-and-distal-intestine-characteristics-in-rats
#17
Martin Beaumont, Daphné Jaoui, Véronique Douard, Damien Mat, Fanny Koeth, Bénédicte Goustard, Camille Mayeur, Stanislas Mondot, Anais Hovaghimian, Steven Le Feunteun, Catherine Chaumontet, Anne-Marie Davila, Daniel Tomé, Isabelle Souchon, Camille Michon, Gilles Fromentin, François Blachier, Marion Leclerc
SCOPE: Few studies have evaluated in vivo the impact of food structure on digestion, absorption of nutrients and on microbiota composition and metabolism. In this study we evaluated in rat the impact of two structures of protein emulsion in food on gut microbiota, luminal content composition, and intestinal characteristics. METHODS AND RESULTS: Rats received for 3 weeks two diets of identical composition but based on lipid-protein matrices of liquid fine (LFE) or gelled coarse (GCE) emulsion...
May 17, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28512157/il-22bp-dictates-characteristics-of-peyer-s-patch-follicle-associated-epithelium-for-antigen-uptake
#18
Toshi Jinnohara, Takashi Kanaya, Koji Hase, Sayuri Sakakibara, Tamotsu Kato, Naoko Tachibana, Takaharu Sasaki, Yusuke Hashimoto, Toshiro Sato, Hiroshi Watarai, Jun Kunisawa, Naoko Shibata, Ifor R Williams, Hiroshi Kiyono, Hiroshi Ohno
Interleukin-22 (IL-22) acts protectively and harmfully on intestinal tissue depending on the situation; therefore, IL-22 signaling needs to be tightly regulated. IL-22 binding protein (IL-22BP) binds IL-22 to inhibit IL-22 signaling. It is expressed in intestinal and lymphoid tissues, although its precise distribution and roles have remained unclear. In this study, we show that IL-22BP is highly expressed by CD11b(+)CD8α(-) dendritic cells in the subepithelial dome region of Peyer's patches (PPs). We found that IL-22BP blocks IL-22 signaling in the follicle-associated epithelium (FAE) covering PPs, indicating that IL-22BP plays a role in regulating the characteristics of the FAE...
May 16, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28511651/high-resolution-mucociliary-transport-measurement-in-live-excised-large-animal-trachea-using-synchrotron-x-ray-imaging
#19
Martin Donnelley, Kaye S Morgan, Maged Awadalla, Nigel R Farrow, Chris Hall, David W Parsons
BACKGROUND: The Australian Synchrotron Imaging and Medical Beamline (IMBL) was designed as the world's widest synchrotron X-ray beam, enabling both clinical imaging and therapeutic applications for humans as well as the imaging of large animal models. Our group is developing methods for imaging the airways of newly developed CF animal models that display human-like lung disease, such as the CF pig, and we expect that the IMBL can be utilised to image airways in animals of this size. METHODS: This study utilised samples of excised tracheal tissue to assess the feasibility, logistics and protocols required for airway imaging in large animal models such as pigs and sheep at the IMBL...
May 16, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28510479/increased-expression-of-p22phox-mediates-airway-hyperresponsiveness-in-an-experimental-model-of-asthma
#20
Chandran Nagaraj, Hans Michael Haitchi, Akos Heinemann, Peter Howarth, Andrea Olschewski, Leigh M Marsh
AIM: Chronic airway diseases such as asthma are associated with increased production of reactive oxygen species (ROS) and oxidative stress. Endogenous NADPH oxidases are a major source of superoxide in lung, but their underlying role in asthma pathology is poorly understood. We sought to characterize the involvement of NADPH oxidase in allergic asthma by studying the role of CYBA (p22phox) in human asthma and murine house dust mite (HDM)-induced allergic airway inflammation. RESULTS: Increased expression and localisation of p22-PHOX was observed in biopsies of asthmatic patients...
May 16, 2017: Antioxidants & Redox Signaling
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