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Mechanism secretion of mucus

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https://www.readbyqxmd.com/read/28223396/personalising-airway-clearance-in-chronic-lung-disease
#1
REVIEW
Maggie McIlwaine, Judy Bradley, J Stuart Elborn, Fidelma Moran
This review describes a framework for providing a personalised approach to selecting the most appropriate airway clearance technique (ACT) for each patient. It is based on a synthesis of the physiological evidence that supports the modulation of ventilation and expiratory airflow as a means of assisting airway clearance. Possession of a strong understanding of the physiological basis for ACTs will enable clinicians to decide which ACT best aligns with the individual patient's pathology in diseases with anatomical bronchiectasis and mucus hypersecretion...
January 2017: European Respiratory Review: An Official Journal of the European Respiratory Society
https://www.readbyqxmd.com/read/28214100/nlrp6-a-multifaceted-innate-immune-sensor
#2
REVIEW
Maayan Levy, Hagit Shapiro, Christoph A Thaiss, Eran Elinav
NLRP6, a member of the nucleotide-binding domain, leucine-rich repeat-containing (NLR) innate immune receptor family, regulates inflammation and host defense against microorganisms. Similar to other NLRs, NLRP6 not only participates in inflammasome formation, but is also involved in nuclear factor-κB (NF-κB) and mitogen-activated protein kinase (MAPK) signaling regulation and facilitation of gastrointestinal antiviral effector functions. Additionally, NLRP6 contributes to the regulation of mucus secretion and antimicrobial peptide production, thereby impacting intestinal microbial colonization and associated microbiome-related infectious, autoinflammatory, metabolic, and neoplastic diseases...
February 14, 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28196385/-comparison-of-different-mechanical-insufflator-exsufflator-systems-by-measurement-of-the-peak-exspiratory-flow-pef
#3
Ansgar Schütz, Janine Wagner, Anne Conrad, Andreas Funke
Background The management of pulmonary secretion in patients with respiratory muscle weakness using mechanical insufflator-exsufflator systems (MIE) is an established treatment option. There are significant differences in the efficiency of different devices in practical use. The intention of this study was to evaluate the peak exspiratory flow (PEF) values of different devices with and without use of equipment. Methods PEFs of ten MIE were investigated in vitro using different equipment. Results The efficiency of the devices showed significant differences...
February 14, 2017: Pneumologie
https://www.readbyqxmd.com/read/28168011/semipurified-ethyl-acetate-partition-of-methanolic-extract-of-melastoma-malabathricum-leaves-exerts-gastroprotective-activity-partly-via-its-antioxidant-antisecretory-anti-inflammatory-action-and-synergistic-action-of-several-flavonoid-based-compounds
#4
Noor Wahida Ismail Suhaimy, Ahmad Khusairi Noor Azmi, Norhafizah Mohtarrudin, Maizatul Hasyima Omar, Siti Farah Md Tohid, Manraj Singh Cheema, Lay Kek Teh, Mohd Zaki Salleh, Zainul Amiruddin Zakaria
Recent study has demonstrated the gastroprotective activity of crude methanolic extract of M. malabathricum leaves. The present study evaluated the gastroprotective potential of semipurified extracts (partitions): petroleum ether, ethyl acetate (EAMM), and aqueous obtained from the methanolic extract followed by the elucidation of the gastroprotective mechanisms of the most effective partition. Using the ethanol-induced gastric ulcer assay, all partitions exerted significant gastroprotection, with EAMM being the most effective partition...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28150752/rainbow-trout-oncorhynchus-mykiss-secretory-component-binds-to-commensal-bacteria-and-pathogens
#5
Cecelia Kelly, Fumio Takizawa, J Oriol Sunyer, Irene Salinas
Commensal bacteria co-exist on the mucosal surfaces of all vertebrates. The host's mucosal immune system must tolerate commensals while fighting pathogens. One of the mechanisms used by the mucosal immune system to maintain homeostasis is the secretion of immunoglobulins (Igs) across epithelial barriers, which is achieved via the polymeric immunoglobulin receptor (pIgR). Rainbow trout pIgR is known to transport IgT and IgM across epithelia. However, other biological functions for trout pIgR or trout secretory component (tSC) remain unknown...
February 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28145442/elevated-gdf-15-contributes-to-pulmonary-inflammation-upon-cigarette-smoke-exposure
#6
F M Verhamme, L J M Seys, E G De Smet, S Provoost, W Janssens, D Elewaut, G F Joos, G G Brusselle, K R Bracke
The molecular mechanisms underlying the pathogenesis of chronic obstructive pulmonary disease (COPD) are still unclear, however signaling pathways associated with lung development, such as the transforming growth factor (TGF)-β superfamily, could be implicated in COPD. Growth differentiation factor (GDF)-15, a member of the TGF-β superfamily, is involved in inflammation, mucus secretion, and cachexia. We analyzed the pulmonary expression of GDF-15 in smokers and patients with COPD, in cigarette smoke (CS)-exposed cultures of primary human bronchial epithelial cells (pHBECs), and in CS-exposed mice...
February 1, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28102702/immunomodulating-peptides-for-food-allergy-prevention-and-treatment
#7
Daniel Lozano-Ojalvo, Rosina López-Fandiño
Among the most promising strategies currently assayed against IgE-mediated allergic diseases stands the possibility of using immunomodulating peptides to induce oral tolerance towards offending food allergens or even to prevent allergic sensitization. This review focuses on the beneficial effects of food derived immunomodulating peptides on food allergy, which can be directly exerted in the intestinal tract or once being absorbed through the intestinal epithelial barrier to interact with immune cells. Food peptides influence intestinal homeostasis by maintaining and reinforcing barrier function or affecting intestinal cell-signalling to nearby immune cells and mucus secretion...
January 19, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28075489/cough-augmentation-techniques-for-extubation-or-weaning-critically-ill-patients-from-mechanical-ventilation
#8
REVIEW
Louise Rose, Neill Kj Adhikari, David Leasa, Dean A Fergusson, Douglas McKim
BACKGROUND: There are various reasons why weaning and extubation failure occur, but ineffective cough and secretion retention can play a significant role. Cough augmentation techniques, such as lung volume recruitment or manually- and mechanically-assisted cough, are used to prevent and manage respiratory complications associated with chronic conditions, particularly neuromuscular disease, and may improve short- and long-term outcomes for people with acute respiratory failure. However, the role of cough augmentation to facilitate extubation and prevent post-extubation respiratory failure is unclear...
January 11, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28069814/muc2-mucin-and-butyrate-contribute-to-the-synthesis-of-the-antimicrobial-peptide-cathelicidin-in-response-to-e-histolytica-and-dss-induced-colitis
#9
Eduardo R Cobo, Vanessa Kissoon-Singh, France Moreau, Ravi Holani, Kris Chadee
Embedded in the colonic mucus are cathelicidins, small cationic peptides secreted by colonic epithelial cells. Humans and mice have one cathelicidin-related antimicrobial peptide (CRAMP), LL-37/hCAP-18 and Cramp respectively, with related structure and functions. Altered production of MUC2 mucin and antimicrobial peptides is characteristic of intestinal amebiasis. The interactions between MUC2 mucin and cathelicidins in conferring innate immunity against Entamoeba histolytica (Eh) are not well characterized...
January 9, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28025644/tnf%C3%AE-affects-ciliary-beat-response-to-increased-viscosity-in-human-pediatric-airway-epithelium
#10
Claudia González, Karla Droguett, Mariana Rios, Noam A Cohen, Manuel Villalón
In airway epithelium, mucociliary clearance (MCC) velocity depends on the ciliary beat frequency (CBF), and it is affected by mucus viscoelastic properties. Local inflammation induces secretion of cytokines (TNFα) that can alter mucus viscosity; however airway ciliated cells have an autoregulatory mechanism to prevent the collapse of CBF in response to increase in mucus viscosity, mechanism that is associated with an increment in intracellular Ca(+2) level ([Ca(2+)]i). We studied the effect of TNFα on the autoregulatory mechanism that regulates CBF in response to increased viscosity using dextran solutions, in ciliated cells cultured from human pediatric epithelial adenoid tissue...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27983723/viruses-and-the-origin-of-microbiome-selection-and-immunity
#11
Steven D Quistad, Juris A Grasis, Jeremy J Barr, Forest L Rohwer
The last common metazoan ancestor (LCMA) emerged over half a billion years ago. These complex metazoans provided newly available niche space for viruses and microbes. Modern day contemporaries, such as cnidarians, suggest that the LCMA consisted of two cell layers: a basal endoderm and a mucus-secreting ectoderm, which formed a surface mucus layer (SML). Here we propose a model for the origin of metazoan immunity based on external and internal microbial selection mechanisms. In this model, the SML concentrated bacteria and their associated viruses (phage) through physical dynamics (that is, the slower flow fields near a diffusive boundary layer), which selected for mucin-binding capabilities...
December 16, 2016: ISME Journal
https://www.readbyqxmd.com/read/27977296/phosphoinositide-3-kinase-in-asthma-novel-roles-and-therapeutic-approaches
#12
Edwin J Yoo, Christie A Ojiaku, Krishna Sunder, Reynold A Panettieri
Asthma manifests as airway hyperresponsiveness and inflammation, including coughing, wheezing, and shortness of breath. Immune cells and airway structural cells orchestrate asthma pathophysiology, leading to mucus secretion, airway narrowing, and obstruction. Phosphoinositide 3-kinase (PI3K), a lipid kinase, plays a crucial role in many of the cellular and molecular mechanisms driving asthma pathophysiology, and represents an attractive therapeutic target. Here, we summarize the diverse roles of PI3K in the pathogenesis of asthma and discuss novel therapeutic approaches to treatment...
December 15, 2016: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/27916735/laryngeal-mucus-hypersecretion-is-exacerbated-after-smoking-cessation-and-ameliorated-by-glucocorticoid-administration
#13
Rumi Ueha, Satoshi Ueha, Kenji Kondo, Takaharu Nito, Yoko Fujimaki, Hironobu Nishijima, Koichi Tsunoda, Francis H W Shand, Kouji Matsushima, Tatsuya Yamasoba
INTRODUCTION: The mechanisms underlying the effects of cigarette smoke and smoking cessation on respiratory secretion, especially in the larynx, remain unclear. OBJECTIVES: The aims of this study were to determine the effects of cigarette smoke and smoking cessation on laryngeal mucus secretion and inflammation, and to investigate the effects of glucocorticoid administration. METHODS: We administered cigarette smoke solution (CSS) to eight-week-old male Sprague Dawley rats for four weeks, then examined laryngeal mucus secretion and inflammatory cytokine expression on days 1, 28 and 90 after smoking cessation...
January 4, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/27908847/homeostasis-of-the-gut-barrier-and-potential-biomarkers
#14
Jerry M Wells, Robert J Brummer, Muriel Derrien, Thomas T MacDonald, Freddy Troost, Patrice D Cani, Vassilia Theodorou, Jan Dekker, Agnes Méheust, Willem M de Vos, Annick Mercenier, Arjen Nauta, Clara L Garcia-Rodenas
The gut barrier plays a crucial role by spatially compartmentalizing bacteria to the lumen through the production of secreted mucus and is fortified by the production of sIgA and antimicrobial peptides and proteins. With exception of sIgA the expression of these protective barrier factors is largely controlled by innate immune recognition of microbial molecular ligands. Several specialized adaptations and checkpoints are operating in the mucosa to scale the immune response according to the threat and prevent overreaction to the trillions of symbionts inhabiting the human intestine...
December 1, 2016: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/27888644/myrtol-standardized-affects-mucociliary-clearance
#15
Ying Ying Li, Jing Liu, Chun Wei Li, Somasundaram Subramaniam, Siew Shuen Chao, Feng Gang Yu, Noam A Cohen, Shi Li, Yun Wang
BACKGROUND: Myrtol standardized (Gelomyrtol forte) has been shown to be effective in controlling nasal symptoms of rhinosinusitis by promoting mucociliary clearance. Our aim was to evaluate the short- and long-term effects of myrtol on ciliated columnar cells and goblet cells in an in-vitro setting. METHODS: Nasal epithelial cells were harvested (42 days) from an air-liquid interface (ALI) culture of human nasal epithelial stem/progenitor cells (hNESPCs), which was derived from biopsies of nasal inferior turbinate mucosa...
November 26, 2016: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/27865862/impaired-mucus-clearance-exacerbates-allergen-induced-type-2-airway-inflammation-in-juvenile-mice
#16
Benedikt Fritzsching, Matthias Hagner, Lu Dai, Sandra Christochowitz, Raman Agrawal, Charlotte van Bodegom, Simone Schmidt, Jolanthe Schatterny, Stephanie Hirtz, Ryan Brown, Michelle Goritzka, Julia Duerr, Zhe Zhou-Suckow, Marcus A Mall
BACKGROUND: Type 2 airway inflammation plays a central role in the pathogenesis of allergen-induced asthma, but the underlying mechanisms remain poorly understood. Recently, we demonstrated that reduced mucociliary clearance, a characteristic feature of asthma, produces spontaneous type 2 airway inflammation in juvenile β-epithelial Na(+) channel (Scnn1b)-transgenic (Tg) mice. OBJECTIVE: We sought to determine the role of impaired mucus clearance in the pathogenesis of allergen-induced type 2 airway inflammation and identify cellular sources of the signature cytokine IL-13...
November 16, 2016: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/27863247/a-dietary-fiber-deprived-gut-microbiota-degrades-the-colonic-mucus-barrier-and-enhances-pathogen-susceptibility
#17
Mahesh S Desai, Anna M Seekatz, Nicole M Koropatkin, Nobuhiko Kamada, Christina A Hickey, Mathis Wolter, Nicholas A Pudlo, Sho Kitamoto, Nicolas Terrapon, Arnaud Muller, Vincent B Young, Bernard Henrissat, Paul Wilmes, Thaddeus S Stappenbeck, Gabriel Núñez, Eric C Martens
Despite the accepted health benefits of consuming dietary fiber, little is known about the mechanisms by which fiber deprivation impacts the gut microbiota and alters disease risk. Using a gnotobiotic mouse model, in which animals were colonized with a synthetic human gut microbiota composed of fully sequenced commensal bacteria, we elucidated the functional interactions between dietary fiber, the gut microbiota, and the colonic mucus barrier, which serves as a primary defense against enteric pathogens. We show that during chronic or intermittent dietary fiber deficiency, the gut microbiota resorts to host-secreted mucus glycoproteins as a nutrient source, leading to erosion of the colonic mucus barrier...
November 17, 2016: Cell
https://www.readbyqxmd.com/read/27825045/therapeutic-effects-of-rosmarinic-acid-on-airway-responses-in-a-murine-model-of-asthma
#18
Zhengmin Liang, Haiying Nie, Yangfeng Xu, Jianbo Peng, Yun Zeng, Yingyi Wei, Xuemei Wen, Jiaming Qiu, Weiting Zhong, Xuming Deng, Jiakang He
Rosmarinic acid (RA) is an active component of a traditional Chinese herbal medicine. Previously, we reported that RA exerted a strong anti-inflammatory effect in a mouse acute lung injury model. Therefore, we hypothesized that RA might also have potential therapeutic effects in a murine model of asthma. In this study, we aimed to evaluate the anti-asthmatic activity of RA and explored its possible molecular mechanisms of action. Female BALB/c mice that had been sensitized to and challenged with ovalbumin (Ova) were treated with RA (20mg/kg) 1h after challenge...
December 2016: International Immunopharmacology
https://www.readbyqxmd.com/read/27799314/il-27-is-essential-for-suppression-of-experimental-allergic-asthma-by-the-tlr7-8-agonist-r848-resiquimod
#19
Adan Chari Jirmo, Kathleen Daluege, Christine Happle, Melanie Albrecht, Anna-Maria Dittrich, Mandy Busse, Anika Habener, Jelena Skuljec, Gesine Hansen
Different models of experimental allergic asthma have shown that the TLR7/8 agonist resiquimod (R848) is a potential inhibitor of type 2 helper cell-driven inflammatory responses. However, the mechanisms mediating its therapeutic effects are not fully understood. Using a model of experimental allergic asthma, we show that induction of IL-27 by R848 is critical for the observed ameliorative effects. R848 significantly inhibited all hallmarks of experimental allergic asthma, including airway hyperreactivity, eosinophilic airway inflammation, mucus hypersecretion, and Ag-specific Ig production...
December 1, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27794589/tilianin-inhibits-muc5ac-expression-mediated-via-down-regulation-of-egfr-mek-erk-sp1-signaling-pathway-in-nci-h292-human-airway-cells
#20
Won-Yong Song, Yong-Seok Song, Hyung Won Ryu, Sei-Ryang Oh, JinTae Hong, Do-Young Yoon
In human airway, mucus exists to protect respiratory system as a primary barrier of innate immune system. However, hyper-expressed mucus limits airflow, resulting in decrease of lung function. Among more than 20 mucin family, MUC5AC and MUC5B are major glycoproteins in human airway mucus. Epidermal growth factor receptor (EGFR) signaling pathway is one of the mechanisms of these mucins expression and Specificity protein-1 (Sp1) transcription factor is the downstream signal of this pathway, playing pivotal roles in mucin expression...
October 28, 2016: Journal of Microbiology and Biotechnology
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