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Lung surfactant

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https://www.readbyqxmd.com/read/27923698/engineered-sodium-hyaluronate-respirable-dry-powders-for-pulmonary-drug-delivery
#1
Francesco Martinelli, Anna Giulia Balducci, Abhinav Kumar, Fabio Sonvico, Ben Forbes, Ruggero Bettini, Francesca Buttini
Sodium hyaluronate (HYA) warrants attention as a material for inhalation due to its (i) therapeutic potential, (ii) utility as a formulation excipient or drug carrier, and (iii) ability to target lung inflammation and cancer. This study aimed to overcome formulation and manufacturing impediments to engineer biocompatible spray-dried HYA powders for inhalation. Novel methodology was developed to produce HYA microparticles by spray drying. Different types of surfactant were included in the formulation to improve powder respirability, which was evaluated in vitro using cascade impactors...
December 3, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27919118/preeclampsia-and-the-risk-of-bronchopulmonary-dysplasia-in-preterm-infants-less-than-32-weeks-gestation
#2
Nancy Soliman, Kathleen Chaput, Belal Alshaikh, Kamran Yusuf
Objective Angiogenesis is essential for normal lung development. The objective of our study was to test the hypothesis that preeclampsia, an antiangiogenic state, is a risk factor for bronchopulmonary dysplasia (BPD). Design Prospective cohort study of infants less than 32 weeks' gestation born to mothers with preeclampsia between January 2007 and June 2010 at a single tertiary care center. Their BPD outcome was compared with infants born to the next two normotensive mothers with a ± 1 week gestational age difference...
December 5, 2016: American Journal of Perinatology
https://www.readbyqxmd.com/read/27916828/enhancing-anticancer-effect-of-gefitinib-across-the-blood-brain-barrier-model-using-liposomes-modified-with-one-%C3%AE-helical-cell-penetrating-peptide-or-glutathione-and-tween-80
#3
Kuan-Hung Lin, Shu-Ting Hong, Hsiang-Tsui Wang, Yu-Li Lo, Anya Maan-Yuh Lin, James Chih-Hsin Yang
Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKI), such as gefitinib, have been demonstrated to effectively treat the patients of extracranial non-small cell lung cancer (NSCLC). However, these patients often develop brain metastasis (BM) during their disease course. The major obstacle to treat BM is the limited penetration of anticancer drugs across the blood-brain barrier (BBB). In the present study, we utilized gefitinib-loaded liposomes with different modifications to improve gefitinib delivery across the in vitro BBB model of bEnd...
November 29, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27913648/cd36-mediated-uptake-of-surfactant-lipids-by-human-macrophages-promotes-intracellular-growth-of-mycobacterium-tuberculosis
#4
Claire E Dodd, Charlie J Pyle, Rebecca Glowinski, Murugesan V S Rajaram, Larry S Schlesinger
Mycobacterium tuberculosis imposes a large global health burden as the airborne agent of tuberculosis. Mycobacterium tuberculosis has been flourishing in human populations for millennia and is therefore highly adapted to the lung environment. Alveolar macrophages, a major host cell niche for M. tuberculosis, are not only phagocytose inhaled microbes and particulate matter but are also crucial in catabolizing lung surfactant, a lipid-protein complex that lines the alveolar spaces. Because macrophage host defense properties can be regulated by surfactant and M...
December 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27913426/depletion-of-circulating-monocytes-suppresses-il-17-and-hmgb1-expression-in-mice-with-lps-induced-acute-lung-injury
#5
Zhilong Jiang, Qianlin Zhou, Chenlin Gu, Dandan Li, Lei Zhu
Acute lung injury/Acute Respiratory distress syndrome (ALI/ARDS) is an important cause of mortality in critically ill patients. Macrophages play an important role in the pathogenesis of ALI/ARDS. To investigate the role and underlying mechanisms of circulating monocytes and resident alveolar macrophages (AMs) in ALI/ARDS, we depleted circulating monocytes and AMs by clodronate-loaded liposome (CL) in lipopolysaccharide (LPS)-induced ALI/ARDS mouse model. Our results indicated that depletion of circulating monocytes by intravenous (i...
December 2, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27899539/reliability-of-displayed-tidal-volume-in-healthy-and-surfactant-depleted-piglets
#6
A Cecilia Mendiondo Luedloff, Tracy L Thurman, Shirley J Holt, Shasha Bai, Mark J Heulitt, Sherry E Courtney
BACKGROUND: Volutrauma has been established as the key factor in ventilator-induced lung injury and can only be avoided if tidal volume (VT) is accurately displayed and delivered. The purpose of this study was to investigate the accuracy of displayed exhaled VT in a ventilator commonly used in small infants with or without a proximal flow sensor and using 3 methods to achieve a target VT in both a healthy and lung-injured neonatal pig model. METHODS: This was a prospective animal study utilizing 8 male pigs, approximately 2...
December 2016: Respiratory Care
https://www.readbyqxmd.com/read/27888997/comprehensive-assessment-of-myositis-specific-autoantibodies-in-polymyositis-dermatomyositis-associated-interstitial-lung-disease
#7
Hironao Hozumi, Tomoyuki Fujisawa, Ran Nakashima, Takeshi Johkoh, Hiromitsu Sumikawa, Akihiro Murakami, Noriyuki Enomoto, Naoki Inui, Yutaro Nakamura, Yuji Hosono, Yoshitaka Imura, Tsuneyo Mimori, Takafumi Suda
OBJECTIVES: Myositis-specific autoantibodies (MSAs) are associated with clinical phenotypes in polymyositis/dermatomyositis (PM/DM). No study has investigated the clinical features based on comprehensive MSA assessment in PM/DM-associated interstitial lung disease (ILD). We aimed to determine the practical significance of MSAs in PM/DM-ILD. METHODS: Sixty consecutive PM/DM-ILD patients were retrospectively analysed. Serum MSAs were comprehensively measured using immunoprecipitation assay...
December 2016: Respiratory Medicine
https://www.readbyqxmd.com/read/27887604/variable-ventilation-improves-pulmonary-function-and-reduces-lung-damage-without-increasing-bacterial-translocation-in-a-rat-model-of-experimental-pneumonia
#8
Raquel F de Magalhães, Cynthia S Samary, Raquel S Santos, Milena V de Oliveira, Nazareth N Rocha, Cintia L Santos, Jamil Kitoko, Carlos A M Silva, Caroline L Hildebrandt, Cassiano F Goncalves-de-Albuquerque, Adriana R Silva, Hugo C Faria-Neto, Vanessa Martins, Vera L Capelozzi, Robert Huhle, Marcelo M Morales, Priscilla Olsen, Paolo Pelosi, Marcelo Gama de Abreu, Patricia R M Rocco, Pedro L Silva
BACKGROUND: Variable ventilation has been shown to improve pulmonary function and reduce lung damage in different models of acute respiratory distress syndrome. Nevertheless, variable ventilation has not been tested during pneumonia. Theoretically, periodic increases in tidal volume (VT) and airway pressures might worsen the impairment of alveolar barrier function usually seen in pneumonia and could increase bacterial translocation into the bloodstream. We investigated the impact of variable ventilation on lung function and histologic damage, as well as markers of lung inflammation, epithelial and endothelial cell damage, and alveolar stress, and bacterial translocation in experimental pneumonia...
November 25, 2016: Respiratory Research
https://www.readbyqxmd.com/read/27886403/rapid-test-for-lung-maturity-based-on-spectroscopy-of-gastric-aspirate-predicted-respiratory-distress-syndrome-with-high-sensitivity
#9
Henrik Verder, Christian Heiring, Howard Clark, David Sweet, Torben E Jessen, Finn Ebbesen, Lars J Björklund, Bengt Andreasson, Lars Bender, Aksel Bertelsen, Marianne Dahl, Christian Eschen, Jesper Fenger-Grøn, Stine F Hoffmann, Agnar Höskuldsson, Maria Bruusgaard-Mouritsen, Fredrik Lundberg, Anthony D Postle, Peter Schousboe, Peter Schmidt, Hristo Stanchev, Lars Sørensen
AIM: Respiratory distress syndrome (RDS) is a major cause of mortality and morbidity in premature infants. By the time symptoms appear it may already be too late to prevent a severe course, with bronchopulmonary dysplasia or mortality. We aimed to develop a rapid test of lung maturity for targeting surfactant supplementation. METHODS: Concentrations of the most surface-active lung phospholipid dipalmitoylphosphatidylcholine and sphingomyelin in gastric aspirates from premature infants were measured by mass spectrometry and expressed as the lecithin/sphingomyelin ratio (L/S)...
November 25, 2016: Acta Paediatrica
https://www.readbyqxmd.com/read/27876355/lung-protective-ventilatory-strategies-in-intubated-preterm-neonates-with-rds
#10
REVIEW
F Reiterer, B Schwaberger, T Freidl, G Schmölzer, G Pichler, B Urlesberger
This article provides a narrative review of lung-protective ventilatory strategies (LPVS) in intubated preterm infants with RDS. A description of strategies is followed by results on short-and long-term respiratory and neurodevelopmental outcomes. Strategies will include patient-triggered or synchronized ventilation, volume targeted ventilation, the technique of intubation, surfactant administration and rapid extubation to NCPAP (INSURE), the open lung concept, strategies of high-frequency ventilation, and permissive hypercapnia...
October 26, 2016: Paediatric Respiratory Reviews
https://www.readbyqxmd.com/read/27873291/prediction-of-non-recovery-from-ventilator-demanding-acute-respiratory-failure-ards-and-death-using-lung-damage-biomarkers-data-from-a-1200-patient-critical-care-randomized-trial
#11
Jens-Ulrik S Jensen, Theis S Itenov, Katrin M Thormar, Lars Hein, Thomas T Mohr, Mads H Andersen, Jesper Løken, Hamid Tousi, Bettina Lundgren, Hans Christian Boesen, Maria E Johansen, Sisse R Ostrowski, Pär I Johansson, Jesper Grarup, Jørgen Vestbo, Jens D Lundgren
BACKGROUND: It is unclear whether biomarkers of alveolar damage (surfactant protein D, SPD) or conductive airway damage (club cell secretory protein 16, CC16) measured early after intensive care admittance are associated with one-month clinical respiratory prognosis. If patients who do not recover respiratory function within one month can be identified early, future experimental lung interventions can be aimed toward this high-risk group. We aimed to determine, in a heterogenous critically ill population, whether baseline profound alveolar damage or conductive airway damage has clinical respiratory impact one month after intensive care admittance...
December 2016: Annals of Intensive Care
https://www.readbyqxmd.com/read/27861467/antenatal-dexamethasone-vs-betamethasone-dosing-for-lung-maturation-in-fetal-sheep
#12
Augusto F Schmidt, Matthew W Kemp, Paranthaman S Kannan, Boris W Kramer, John P Newnham, Suhas G Kallapur, Alan H Jobe
BackgroundDexamethasone-phosphate (Dex-PO4) and the combination betamethasone-phosphate (Beta-PO4) + betamethasone-acetate (Beta-Ac) are the most used antenatal corticosteroids to promote fetal lung maturation . We compared fetal lung maturation induced by Beta-Ac+Beta-PO4, Dex-PO4, or Beta-PO4 alone.MethodsPregnant ewes received 2 intramuscular doses 24h apart of 0.25mg/kg/dose of Beta-Ac+Beta-PO4, Dex-PO4 or Beta-PO4; or 2 doses of 0.125mg/kg/dose of Beta-PO4 at 6h, 12h, or 24h intervals. Fetuses were delivered 48h after the first dose and ventilated for 30min...
November 18, 2016: Pediatric Research
https://www.readbyqxmd.com/read/27856214/inflammation-induced-preterm-lung-maturation-lessons-from-animal-experimentation
#13
REVIEW
Timothy J M Moss, Alana J Westover
Intrauterine inflammation, or chorioamnionitis, is a major contributor to preterm birth. Prematurity per se is associated with considerable morbidity and mortality resulting from lung immaturity but exposure to chorioamnionitis reduces the risk of neonatal respiratory distress syndrome (RDS) in preterm infants. Animal experiments have identified that an increase in pulmonary surfactant production by the preterm lungs likely underlies this decreased risk of RDS in infants exposed to chorioamnionitis. Further animal experimentation has shown that infectious or inflammatory agents in amniotic fluid exert their effects on lung development by direct effects within the developing respiratory tract, and probably not by systemic pathways...
October 20, 2016: Paediatric Respiratory Reviews
https://www.readbyqxmd.com/read/27852668/less-invasive-surfactant-administration-versus-intubation-for-surfactant-delivery-in-preterm-infants-with-respiratory-distress-syndrome-a-systematic-review-and-meta-analysis
#14
Jose C Aldana-Aguirre, Merlin Pinto, Robin M Featherstone, Manoj Kumar
CONTEXT: In spontaneously breathing preterm infants with respiratory distress syndrome (RDS) receiving nasal continuous positive airway pressure, a method of less invasive surfactant administration (LISA) using a thin catheter has been described as an alternative to endotracheal intubation for surfactant delivery to reduce lung injury. OBJECTIVE: A systematic review of randomised controlled trials (RCTs) comparing LISA with the standard method of surfactant delivery for clinical outcomes...
November 15, 2016: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/27836900/lethal-h1n1-influenza-a-virus-infection-alters-the-murine-alveolar-type-ii-cell-surfactant-lipidome
#15
Parker S Woods, Lauren May Doolittle, Lucia Elena Rosas, Lisa M Joseph, Edward P Calomeni, Ian Christopher Davis
BACKGROUND: Alveolar type II (ATII) epithelial cells are the primary site of influenza virus replication in the distal lung. Development of acute respiratory distress syndrome (ARDS) in influenza-infected mice correlates with significant alterations in ATII cell function. However, the impact of infection on ATII cell surfactant lipid metabolism has never been explored. METHODS: C57BL/6 mice were inoculated intranasally with 10,000 pfu/mouse of influenza A/WSN/33 (H1N1) or mock-infected with virus diluent...
November 11, 2016: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/27836807/surfactant-protein-a-a-key-player-in-lung-homeostasis
#16
Nadia Nathan, Jessica Taytard, Philippe Duquesnoy, Guillaume Thouvenin, Harriet Corvol, Serge Amselem, Annick Clement
The respiratory tract is continually exposed to various insults that are a permanent threat to the maintenance of lung homeostasis. Repair of the parenchyma structure, particularly of the alveolar epithelium, requires complex cellular strategies. Among the molecular components that play an important role in these processes are the surfactant proteins (SPs), particularly SP-A. The present review examines current evidence regarding the role of SP-A in lung host defence mechanisms through its implication in innate/adaptive immunity of the lung and epithelium integrity and repair...
November 9, 2016: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/27836576/establishment-of-a-conditional-transgenic-mouse-model-recapitulating-eml4-alk-positive-human-non-small-cell-lung-cancer
#17
Kyoung Ho Pyo, Sun Min Lim, Hye Ryun Kim, Young Hoon Sung, Mi Ran Yun, Sung-Moo Kim, Hwan Kim, Han Na Kang, Ji Min Lee, Sang Gyun Kim, Chae Won Park, Hyun Chang, Hyo Sup Shim, Han-Woong Lee, Byoung Chul Cho
BACKGROUND: ALK fusion is a distinct molecular subclassification of non-small-cell lung cancer (NSCLC) that is targeted by ALK inhibitors. We established a transgenic mouse model that expresses tumors highly resembling human NSCLC harboring EML-ALK fusion. We aimed to test EML4-ALK transgenic mouse model as a platform for assessing efficacy of ALK inhibitor and examining mechanisms of acquired resistance to ALK inhibitor. MATERIALS AND METHODS: Transgenic mouse lines harboring LoxP-STOP-LoxP- FLAG tagged human EML4-ALK (variant 1) transgene was established using C57BL/6N mice...
November 8, 2016: Journal of Thoracic Oncology
https://www.readbyqxmd.com/read/27834732/oxidant-generation-dna-damage-and-cytotoxicity-by-a-panel-of-engineered-nanomaterials-in-three-different-human-epithelial-cell-lines
#18
Waluree Thongkam, Kirsten Gerloff, Damien van Berlo, Catrin Albrecht, Roel P F Schins
Due to the steeply increased use of nanomaterials (NMs) for commercial and industrial applications, toxicological assessment of their potential harmful effects is urgently needed. In this study, we compared the DNA-damaging properties and concurrent cytotoxicity of a panel of 10 engineered NMs in three different cell lines in relation to their intrinsic oxidant generating properties. The human epithelial cell lines A549, HK-2 and HepG2 were chosen to represent relevant target organs for NMs in the lung, kidney and liver...
November 10, 2016: Mutagenesis
https://www.readbyqxmd.com/read/27830194/effect-of-high-fat-diet-on-pulmonary-expression-of-parathyroid-hormone-related-protein-and-its-downstream-targets
#19
Learta Oruqaj, Svenja Forst, Rolf Schreckenberg, Javier Inserte, Marcos Poncelas, Jordi Bañeras, David Garcia-Dorado, Susanne Rohrbach, Klaus-Dieter Schlüter
AIMS: Parathyroid hormone-related protein (PTHrP) is involved in lung development and surfactant production. The latter one requires a paracrine interaction between type II alveolar cells and lipofibroblasts in which leptin triggers PTHrP-induced effects. Whether increased plasma leptin levels, as they occur in high fat diet, modify the expression of PTHrP remains unclear. Furthermore, the effect of high fat diet under conditions of forced pulmonary remodelling such as response to post myocardial infarction remains to be defined...
October 2016: Heliyon
https://www.readbyqxmd.com/read/27828734/anti-inflammatory-effects-of-the-new-generation-synthetic-surfactant-chf5633-on-ureaplasma-induced-cytokine-responses-in-human-monocytes
#20
K Glaser, M Fehrholz, B Henrich, H Claus, M Papsdorf, C P Speer
BACKGROUND: Synthetic surfactants represent a promising alternative to animal-derived preparations in the treatment of neonatal respiratory distress syndrome. The synthetic surfactant CHF5633 has proven biophysical effectiveness and, moreover, demonstrated anti-inflammatory effects in LPS-stimulated monocytes. With ureaplasmas being relevant pathogens in preterm lung inflammation, the present study addressed immunomodulatory features on Ureaplasma-induced monocyte cytokine responses. METHODS: Ureaplasma parvum-stimulated monocytes were exposed to CHF5633...
November 9, 2016: Expert Review of Anti-infective Therapy
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