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Mechanism of airway clearance

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https://www.readbyqxmd.com/read/28619948/administration-of-immunobiotic-lactobacillus-plantarum-delays-but-does-not-prevent-lethal-pneumovirus-infection-in-rag1-mice
#1
Caroline M Percopo, Michelle Ma, Helene F Rosenberg
Administration of immunobiotic Lactobacillus plantarum (Lp) directly to the respiratory mucosa promotes cross-protection against lethal pneumovirus infection via B-cell-independent mechanisms. In this study, we examined Lp-mediated cross protection in Rag1(-/-) mice which cannot clear virus from lung tissue. Although Lp was initially protective, Rag1(-/-) mice ultimately succumbed to a delayed lethal outcome associated with local production of the proinflammatory cytokines CCL1, -2, and -7, granulocyte recruitment, and ongoing virus replication...
June 15, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28619528/ineffective-cough-and-mechanical-mucociliary-clearance-techniques
#2
A Fernández-Carmona, L Olivencia-Peña, M E Yuste-Ossorio, L Peñas-Maldonado
Cough is a fundamental defense mechanism for keeping the airway free of foreign elements. Life-threatening situations may arise when cough proves ineffective as a result of muscle weakness or altered mucociliary function. When a patient is unable to cough effectively, techniques are required to either reinforce or replace cough capacity. The use of mechanical systems that facilitate or substitute cough function is increasingly common in Intensive Care Units, where it is relatively frequent to find situations of ineffective cough due to different clinical causes...
June 12, 2017: Medicina Intensiva
https://www.readbyqxmd.com/read/28596972/targets-of-neutrophil-influx-and-weaponry-therapeutic-opportunities-for-chronic-obstructive-airway-disease
#3
REVIEW
Carina Kärrman Mårdh, James Root, Mohib Uddin, Kristina Stenvall, Anna Malmgren, Kostas Karabelas, Matthew Thomas
Neutrophils are important effector cells of antimicrobial immunity in an acute inflammatory response, with a primary role in the clearance of extracellular pathogens. However, in respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD), there is excessive infiltration and activation of neutrophils, subsequent production of reactive oxygen species, and release of serine proteases, matrix metalloproteinases, and myeloperoxidase-resulting in collateral damage as the cells infiltrate into the tissue...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28566368/caspofungin-increases-fungal-chitin-and-eosinophil-and-%C3%AE-%C3%AE-t-cell-dependent-pathology-in-invasive-aspergillosis
#4
Nansalmaa Amarsaikhan, Ethan M Sands, Anand Shah, Ali Abdolrasouli, Anna Reed, James E Slaven, Darius Armstrong-James, Steven P Templeton
The polysaccharide-rich fungal cell wall provides pathogen-specific targets for antifungal therapy and distinct molecular patterns that stimulate protective or detrimental host immunity. The echinocandin antifungal caspofungin inhibits synthesis of cell wall β-1,3-glucan and is used for prophylactic therapy in immune-suppressed individuals. However, breakthrough infections with fungal pathogen Aspergillus fumigatus are associated with caspofungin prophylaxis. In this study, we report in vitro and in vivo increases in fungal surface chitin in A...
May 31, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28523001/the-role-of-transient-receptor-potential-vanilloid-4-in-pulmonary-inflammatory-diseases
#5
REVIEW
Rachel G Scheraga, Brian D Southern, Lisa M Grove, Mitchell A Olman
Ion channels/pumps are essential regulators of organ homeostasis and disease. In the present review, we discuss the role of the mechanosensitive cation channel, transient receptor potential vanilloid 4 (TRPV4), in cytokine secretion and pulmonary inflammatory diseases such as asthma, cystic fibrosis (CF), and acute lung injury/acute respiratory distress syndrome (ARDS). TRPV4 has been shown to play a role in lung diseases associated with lung parenchymal stretch or stiffness. TRPV4 indirectly mediates hypotonicity-induced smooth muscle contraction and airway remodeling in asthma...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28497033/intrapulmonary-percussive-ventilation-as-an-airway-clearance-technique-during-venoarterial-extracorporeal-life-support-in-an-infant-with-pertussis
#6
Conrad Krawiec, Ken Ballinger, E Scott Halstead
Initiation of extracorporeal life support (ECLS) is often followed by complete opacification of pulmonary parenchyma and volume loss. The optimal mechanical ventilator management and lung recruitment strategy of a pediatric patient requiring extracorporeal membrane oxygenation is not known. We present a case of a 4-week old infant who developed a severe pertussis infection requiring ECLS. The severity of his illness and pertussis infection-associated intraluminal bronchiole obstruction made medical management challenging...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/28489239/therapeutic-effect-of-hyaluronic-acid-in-reducing-nasal-mucosa-recovery-time-after-septoplasty
#7
Francesco Klinger, Fabio Caviggioli, Andrea Vittorio Lisa, Luca Maione, Valeriano Vinci, Mattia Siliprandi, Federico Barbera, Marco Klinger, Luca Malvezzi
Mucociliary clearance represents a host defense mechanism of airways that can be compromised by various pathologic conditions, such as nasal septal deviation. Although septoplasty can resolve obstruction, it impairs mucociliary clearance in the immediate postoperative period. Clinical studies have demonstrated how hyaluronic acid can interfere with this function. Our study aims to provide evidence of a therapeutic effect of hyaluronic acid on nasal mucosa recovery after septoplasy. Sixty-five patients underwent septoplasty...
April 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28459101/innate-immunity-and-chronic-rhinosinusitis-what-we-have-learned-from-animal-models
#8
Nyall R London, Andrew P Lane
OBJECTIVE: Chronic rhinosinusitis (CRS) is a heterogeneous and multifactorial disease characterized by dysregulated inflammation. Abnormalities in innate immune function including sinonasal epithelial cell barrier function, mucociliary clearance, response to pathogen-associated molecular patterns (PAMPs) via pattern recognition receptors (PRRs), and the contribution of innate immune cells will be highlighted in this review. DATA SOURCES: PubMed literature review...
June 2016: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28449098/insights-on-persistent-airway-infection-by-non-typeable-haemophilus-influenzae-in-chronic-obstructive-pulmonary-disease
#9
Christian P Ahearn, Mary C Gallo, Timothy F Murphy
Non-typeable Haemophilus influenzae (NTHi) is the most common bacterial cause of infection of the lower airways in adults with chronic obstructive pulmonary disease (COPD). Infection of the COPD airways causes acute exacerbations, resulting in substantial morbidity and mortality. NTHi has evolved multiple mechanisms to establish infection in the hostile environment of the COPD airways, allowing the pathogen to persist in the airways for months to years. Persistent infection of the COPD airways contributes to chronic airway inflammation that increases symptoms and accelerates the progressive loss of pulmonary function, which is a hallmark of the disease...
June 1, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28446427/airway-epithelial-anion-secretion-and-barrier-function-following-exposure-to-fungal-aeroallergens-role-of-oxidative-stress
#10
Nathan A Zaidman, Kelly E O'Grady, Nandadevi Patil, Francesca Milavetz, Peter J Maniak, Hirohito Kita, Scott M O'Grady
Aeroallergens produced by Alternaria alternata can elicit life-threatening exacerbations of asthma in patients sensitized to this fungus. In this study, the effect of Alternaria on ion transport mechanisms underlying mucociliary clearance and airway epithelial barrier function was investigated in human airway epithelial cells. Apical exposure to Alternaria induced an increase in anion secretion that was inhibited by blockers of CFTR and Ca(2+)-activated Cl(-) channels. Stimulation of anion secretion was dependent on Ca(2+) uptake from the apical solution...
April 26, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28444078/expiratory-rib-cage-compression-in-mechanically-ventilated-adults-systematic-review-with-meta-analysis
#11
Lúcia Faria Borges, Mateus Sasso Saraiva, Marcos Ariel Sasso Saraiva, Fabrício Edler Macagnan, Adriana Kessler
Objective: To review the literature on the effects of expiratory rib cage compression on ventilatory mechanics, airway clearance, and oxygen and hemodynamic indices in mechanically ventilated adults. Methods: Systematic review with meta-analysis of randomized clinical trials in the databases MEDLINE (via PubMed), EMBASE, Cochrane CENTRAL, PEDro, and LILACS. Studies on adult patients hospitalized in intensive care units and under mechanical ventilation that analyzed the effects of expiratory rib cage compression with respect to a control group (without expiratory rib cage compression) and evaluated the outcomes static and dynamic compliance, sputum volume, systolic blood pressure, diastolic blood pressure, mean arterial pressure, heart rate, peripheral oxygen saturation, and ratio of arterial oxygen partial pressure to fraction of inspired oxygen were included...
January 2017: Revista Brasileira de Terapia Intensiva
https://www.readbyqxmd.com/read/28442070/comparing-airways-clearance-techniques-in-chronic-obstructive-pulmonary-disease-and-bronchiectasis-positive-expiratory-pressure-or-temporary-positive-expiratory-pressure-a-retrospective-study
#12
Francesco D'Abrosca, Barbara Garabelli, Gloria Savio, Agnese Barison, Lorenzo Appendini, Luis V F Oliveira, Paola Baiardi, Bruno Balbi
BACKGROUND: Airway clearance techniques include positive expiratory pressure, commonly used in our clinical practice, and a recently introduced temporary positive expiratory pressure device called UNIKO(®). It is unclear which one provides the best benefit to patients. OBJECTIVES: The aim of this observational 4-year study was to retrospectively compare the efficacy of and specific indications for temporary positive expiratory pressure compared to positive expiratory pressure in a standard rehabilitation program...
January 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28435870/nanoparticles-that-do-not-adhere-to-mucus-provide-uniform-and-long-lasting-drug-delivery-to-airways-following-inhalation
#13
Craig S Schneider, Qingguo Xu, Nicholas J Boylan, Jane Chisholm, Benjamin C Tang, Benjamin S Schuster, Andreas Henning, Laura M Ensign, Ethan Lee, Pichet Adstamongkonkul, Brian W Simons, Sho-Yu S Wang, Xiaoqun Gong, Tao Yu, Michael P Boyle, Jung Soo Suk, Justin Hanes
Mucoadhesive particles (MAP) have been widely explored for pulmonary drug delivery because of their perceived benefits in improving particle residence in the lungs. However, retention of particles adhesively trapped in airway mucus may be limited by physiologic mucus clearance mechanisms. In contrast, particles that avoid mucoadhesion and have diameters smaller than mucus mesh spacings rapidly penetrate mucus layers [mucus-penetrating particles (MPP)], which we hypothesized would provide prolonged lung retention compared to MAP...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28422188/resolvin-d1-enhances-the-resolution-of-lung-inflammation-caused-by-long-term-pseudomonas-aeruginosa-infection
#14
M Codagnone, E Cianci, A Lamolinara, V C Mari, A Nespoli, E Isopi, D Mattoscio, M Arita, A Bragonzi, M Iezzi, M Romano, A Recchiuti
Pseudomonas aeruginosa lung infection is a main cause of disability and mortality worldwide. Acute inflammation and its timely resolution are crucial for ensuring bacterial clearance and limiting tissue damage. Here, we investigated protective actions of resolvin (Rv) D1 in lung infection induced by the RP73 clinical strain of P. aeruginosa. RvD1 significantly diminished bacterial growth and neutrophil infiltration during acute pneumonia caused by RP73. Inoculum of RP73, immobilized in agar beads, resulted in persistent lung infection up to 21 days, leading to a non resolving inflammation reminiscent of human pathology...
April 19, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28405161/mucoactive-and-antioxidant-medicines-for-copd-consensus-of-a-group-of-chinese-pulmonary-physicians
#15
REVIEW
Xixin Yan, Yuanlin Song, Ce Shen, Wenbing Xu, Liangan Chen, Jian Zhang, Huiguo Liu, Mao Huang, Guoxiang Lai, Guishen Qian, Jing Wang, Xianwei Ye, Jinping Zheng, Chunxue Bai
Airway mucus hypersecretion is a frequent symptom associated with acute and chronic airway disease. Inhibition of mucus production or promotion of mucolysis not only relieved symptoms but also improved disease outcomes. There are numerous available mucoactive medicines for prescription, and how to select them properly for different diseases is important for clinical practice. So far, there is no one consensus or guideline reported. A group of Chinese pulmonary physicians worked together to complete this consensus based on literature review, summarized mechanism and usage of each classical mucoactive medicine...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28352653/defective-postsecretory-maturation-of-muc5b-mucin-in-cystic-fibrosis-airways
#16
Lubna H Abdullah, Jessica R Evans, T Tiffany Wang, Amina A Ford, Alexander M Makhov, Kristine Nguyen, Raymond D Coakley, Jack D Griffith, C William Davis, Stephen T Ballard, Mehmet Kesimer
In cystic fibrosis (CF), airway mucus becomes thick and viscous, and its clearance from the airways is impaired. The gel-forming mucins undergo an ordered "unpacking/maturation" process after granular release that requires an optimum postsecretory environment, including hydration and pH. We hypothesized that this unpacking process is compromised in the CF lung due to abnormal transepithelial fluid transport that reduces airway surface hydration and alters ionic composition. Using human tracheobronchial epithelial cells derived from non-CF and CF donors and mucus samples from human subjects and domestic pigs, we investigated the process of postsecretory mucin unfolding/maturation, how these processes are defective in CF airways, and the probable mechanism underlying defective unfolding...
March 23, 2017: JCI Insight
https://www.readbyqxmd.com/read/28348774/latent-infection-of-human-bocavirus-accompanied-by-flare-of-chronic-cough-fatigue-and-episodes-of-viral-replication-in-an-immunocompetent-adult-patient-cologne-germany
#17
Wolfram Windisch, Monika Pieper, Inga Ziemele, Jürgen Rockstroh, Michael Brockmann, Oliver Schildgen, Verena Schildgen
INTRODUCTION: The human bocavirus (HBoV) is a parvovirus and is associated with mild to life-threatening acute or persisting respiratory infections, frequently accompanied by further pathogens. So far, there is limited knowledge on the mechanisms of persistence, and no reports on chronic infections or latency have been published so far. CASE PRESENTATION: An immunocompetent male patient suffers from a chronic HBoV1 infection, i.e. viral DNA was detected in both serum and bronchoalveolar lavage (BAL) for >5 months without co-infections and with respiratory symptoms resolved spontaneously while receiving symptomatic treatment with montelukast and corticosteroids...
August 2016: JMM Case Reports
https://www.readbyqxmd.com/read/28346012/lymphangiogenesis-fuel-smoke-or-extinguisher-of-inflammation-s-fire
#18
REVIEW
Gabriella R Abouelkheir, Bradley D Upchurch, Joseph M Rutkowski
Lymphangiogenesis is a recognized hallmark of inflammatory processes in tissues and organs as diverse as the skin, heart, bowel, and airways. In clinical and animal models wherein the signaling processes of lymphangiogenesis are manipulated, most studies demonstrate that an expanded lymphatic vasculature is necessary for the resolution of inflammation. The fundamental roles that lymphatics play in fluid clearance and immune cell trafficking from the periphery make these results seemingly obvious as a mechanism of alleviating locally inflamed environments: the lymphatics are simply providing a drain...
April 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28345309/a-survey-of-clinicians-regarding-respiratory-physiotherapy-intervention-for-intubated-and-mechanically-ventilated-patients-with-community-acquired-pneumonia-what-is-current-practice-in-australian-icus
#19
Lisa van der Lee, Anne-Marie Hill, Shane Patman
RATIONALE, AIMS, AND OBJECTIVES: Community-acquired pneumonia (CAP) is a common cause for intensive care unit (ICU) admission resulting in high morbidity and mortality. There is a paucity of evidence regarding respiratory physiotherapy for intubated and mechanically ventilated patients with CAP, and anecdotally clinical practice is variable in this cohort. The aims of this study were to identify the degree of variability in physiotherapy practice for intubated adult patients with CAP and to explore ICU physiotherapist perceptions of current practice for this cohort and factors that influence physiotherapy treatment mode, duration, and frequency...
March 27, 2017: Journal of Evaluation in Clinical Practice
https://www.readbyqxmd.com/read/28338488/respiratory-complications-management-and-treatments-for-neuromuscular-disease-in-children
#20
MyMy C Buu
PURPOSE OF REVIEW: To summarize current literature describing the respiratory complications of neuromuscular disease (NMD) and the effect of respiratory interventions and to explore new gene therapies for patients with NMD. RECENT FINDINGS: Measurements of respiratory function focus on vital capacity and maximal inspiratory and expiratory pressure and show decline over time. Management of respiratory complications includes lung volume recruitment, mechanical insufflation-exsufflation, chest physiotherapy and assisted ventilation...
June 2017: Current Opinion in Pediatrics
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