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Normal lung physiology

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https://www.readbyqxmd.com/read/29755573/thymus-and-activation-regulated-chemokine-tarc-ccl17-and-ige-are-associated-with-elderly-asthmatics
#1
Kyung Mi Jo, Hyo Kyung Lim, Jae Woong Sull, Eugene Choi, Ji-Sook Lee, Mee Ae Cheong, Min Hwa Hong, Yoori Kim, In Sik Kim
Background: The pathogenesis of asthma, which is an allergic lung disease, is associated with a variety of allergens such as house dust mite, pollen, and mould, IgE containing serum IgE and allergen-specific-IgE, and inflammatory cytokines including thymus and activation-regulated chemokine (TARC)/CCL17. Because aging is an essential factor in the pathogenesis of asthma, we examined biomarkers related to asthmatic subjects depending on age. Results: Physiological indices such as FEV1(forced expiratory capacity in 1 s), FEV1 (% predicted), and FEV1/FVC(forced vital capacity) (%) in asthmatic subjects were lower than those in normal subjects...
2018: Immunity & Ageing: I & A
https://www.readbyqxmd.com/read/29742703/nebulized-heparin-and-n-acetylcysteine-for-smoke-inhalational-injury-a-case-report
#2
Umair Ashraf, Bharat Bajantri, Gabriella Roa-Gomez, Sindhaghatta Venkatram, Amanda Cantin, Gilda Diaz-Fuentes
RATIONALE: Every year, ∼40,000 people suffer burn-related injuries in the United States. Despite recent advances, the odds of dying from exposure to fire, flames, or smoke are one in ∼1500. Smoke inhalation causes injury to the airways via a complex physiological process, and the treatment is mainly supportive. Many recent interventions aim to decrease the formation of fibrin casts, the main cause of airway damage in these patients. Among these, treatment with a combination of nebulized heparin and N-acetylcysteine (NAC) has shown benefit...
May 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29726119/inverse-association-of-vitamin-d-3-levels-with-lung-cancer-mediated-by-genetic-variation
#3
Majda Haznadar, Kristopher W Krausz, Ezra Margono, Christopher M Diehl, Elise D Bowman, Soumen Kanti Manna, Ana I Robles, Bríd M Ryan, Frank J Gonzalez, Curtis C Harris
Vitamin D is an essential micronutrient required for normal physiological function and recognized for its role regulating calcium metabolism. Recent work is beginning to emerge demonstrating a role for vitamin D in chronic illnesses, such as cancer. Circulating serum levels of 25(OH)D2/3 were quantitatively measured using sensitive ultraperformance liquid chromatography coupled to tandem mass spectrometry (UPLC-MS/MS) in 406 lung cancer cases and 437 population controls, while 1,25(OH)2 D2/3 levels were measured in a subset of 90 cases and 104 controls using the same method, from the NCI-MD case-control cohort...
May 3, 2018: Cancer Medicine
https://www.readbyqxmd.com/read/29716959/the-phospholipase-a2-activity-of-peroxiredoxin-6
#4
Aron B Fisher
Peroxiredoxin 6 (Prdx6) is a Ca2+-independent intracellular phospholipase A2 (called aiPLA2) that is localized to cytosol and acidic organelles (lysosomes and lysosomal-related organelles). Activity is minimal at cytosolic pH but is increased significantly at acidic pH, in the presence of oxidized phospholipid substrate, with protein oxidation, and with enzyme phosphorylation; maximal activity with phosphorylated aiPLA2 is ~2 μmol/min/mg protein. Prdx6 is a ″moonlighting″ protein that also expresses peroxidase and lysophosphatidylcholine acyl transferase activities...
May 1, 2018: Journal of Lipid Research
https://www.readbyqxmd.com/read/29693559/a-novel-approach-to-the-identification-of-compromised-pulmonary-systems-in-smokers-by-exploiting-tidal-breathing-patterns
#5
Raj Rakshit, Anwesha Khasnobish, Arijit Chowdhury, Arijit Sinharay, Arpan Pal, Tapas Chakravarty
Smoking causes unalterable physiological abnormalities in the pulmonary system. This is emerging as a serious threat worldwide. Unlike spirometry, tidal breathing does not require subjects to undergo forceful breathing maneuvers and is progressing as a new direction towards pulmonary health assessment. The aim of the paper is to evaluate whether tidal breathing signatures can indicate deteriorating adult lung condition in an otherwise healthy person. If successful, such a system can be used as a pre-screening tool for all people before some of them need to undergo a thorough clinical checkup...
April 25, 2018: Sensors
https://www.readbyqxmd.com/read/29675827/significant-increase-of-lymphatic-vessels-in-pleuroparenchymal-fibroelastosis
#6
Yoshiaki Kinoshita, Kentaro Watanabe, Hiroshi Ishii, Hisako Kushima, Masaki Fujita, Kazuki Nabeshima
AIMS: Some investigators have detected fibrinous exudate or immature organization in the alveolar spaces prior to the development of subpleural elastofibrosis in patients with pleuroparenchymal fibroelastosis (PPFE). We hypothesized that PPFE progress is associated with an impaired lymphatic drainage system, resulting in the failed resolution of intra-alveolar exudate. METHODS AND RESULTS: We retrospectively reviewed our medical records from 1995 to 2017 and selected autopsied or surgically biopsied patients with PPFE (n=18), pulmonary apical cap (n=18), and idiopathic pulmonary fibrosis (IPF) (n=26)...
April 19, 2018: Histopathology
https://www.readbyqxmd.com/read/29656244/human-organoid-cultures-transformative-new-tools-for-human-virus-studies
#7
REVIEW
Sasirekha Ramani, Sue E Crawford, Sarah E Blutt, Mary K Estes
Studies of human infectious diseases have been limited by the paucity of functional models that mimic normal human physiology and pathophysiology. Recent advances in the development of multicellular, physiologically active organotypic cultures produced from embryonic and pluripotent stem cells, as well as from stem cells isolated from biopsies and surgical specimens are allowing unprecedented new studies and discoveries about host-microbe interactions. Here, we summarize recent developments in the use of organoids for studying human viral pathogens, including intestinal infections with human rotavirus, norovirus, enteroviruses and adenoviruses (intestinal organoids and enteroids), neuronal infections with Zika virus (cerebral organoids) and respiratory infections with respiratory syncytial virus in (lung bud organoids)...
April 2018: Current Opinion in Virology
https://www.readbyqxmd.com/read/29628583/pressure-controlled-volume-guaranteed-mode-improves-respiratory-dynamics-during-laparoscopic-cholecystectomy-a-comparison-with-conventional-modes
#8
Apoorwa Kothari, Deepa Baskaran
Background: Pneumoperitoneum and altered positioning 1in laparoscopic cholecystectomy predispose to alterations in cardiorespiratory physiology. We compared the effects of volume controlled, pressure controlled, and the newly introduced pressure controlled-volume guaranteed ventilation (PCV-VG) modes of ventilation on respiratory mechanics and oxygenation during laparoscopic cholecystectomy. Materials and Methods: Seventy-five physical status American Society of Anesthesiologists Classes I and II patients with normal lungs undergoing laparoscopic cholecystectomy were randomly allocated to receive volume controlled ventilation (VCV), pressure-controlled ventilation (PCV), or PCV-VG modes of ventilation during general anesthesia...
January 2018: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/29617746/thoracoabdominal-pressure-gradient-and-gastroesophageal-reflux-insights-from-lung-transplant-candidates
#9
T Masuda, S K Mittal, B Kovacs, M Smith, R Walia, J Huang, R M Bremner
Advanced lung disease is associated with gastroesophageal reflux disease (GERD). The thoracoabdominal pressure gradient (TAPG) facilitates gastroesophageal reflux, but the effects of TAPG on gastroesophageal reflux in patients with pulmonary disease have not been well defined. Patients diagnosed with end-stage lung disease are expected to have the most extreme derangement in respiratory mechanics. The aim of this study is to explore the relationship between TAPG and reflux in lung transplant (LTx) candidates...
March 31, 2018: Diseases of the Esophagus: Official Journal of the International Society for Diseases of the Esophagus
https://www.readbyqxmd.com/read/29602706/baseline-lung-allograft-dysfunction-is-associated-with-impaired-survival-after-double-lung-transplantation
#10
Jonathan Liu, Kathy Jackson, Justin Weinkauf, Ali Kapasi, Alim Hirji, Steve Meyer, John Mullen, Jayan Nagendran, Dale Lien, Kieran Halloran
BACKGROUND: The prognostic value of defining normal vs abnormal baseline post-transplant lung function (or baseline lung allograft dysfunction [BLAD]) has not been studied using standardized reference values of percent predicted of the population. Our aim was to assess the association between BLAD and survival in double-lung transplant recipients and assess for potential pre-transplant donor and recipient risk factors for BLAD. METHODS: We conducted a retrospective cohort study of double-lung transplant recipients in our program during the period 2004 to 2009...
February 27, 2018: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/29596206/constrictive-bronchiolitis-in-patients-with-primary-sj%C3%A3-gren-syndrome
#11
Elizabeth C Wight, Misbah Baqir, Jay H Ryu
OBJECTIVE: Constrictive bronchiolitis (CB) is a poorly understood pulmonary manifestation of primary Sjögren syndrome (pSS). We aimed to clarify the presenting clinicoradiologic features and clinical course of pSS-associated CB through a retrospective cohort study. METHODS: We retrospectively identified 11 patients with pSS and CB (defined by mosaic pattern with air trapping on computed tomography) encountered at our institution over 9 years from 2007 to 2015. Presenting clinical features, laboratory results, radiologic findings, and clinical course were analyzed...
March 29, 2018: Journal of Clinical Rheumatology: Practical Reports on Rheumatic & Musculoskeletal Diseases
https://www.readbyqxmd.com/read/29572534/the-effects-of-hydroxyethyl-starch-and-gelatine-on-pulmonary-cytokine-production-and-oedema-formation
#12
Julia Krabbe, Nadine Ruske, Till Braunschweig, Svetlana Kintsler, Jan W Spillner, Thomas Schröder, Sebastian Kalverkamp, Stephanie Kanzler, Annette D Rieg, Stefan Uhlig, Christian Martin
Recently, side effects of plasma expanders like hydroxyethyl starch and gelatine gained considerable attention. Most studies have focused on the kidneys; lungs remain unconsidered. Isolated mouse lungs were perfused for 4 hours with buffer solutions based on hydroxyethyl starch (HES) 130/0.4, HES 200/0.5 or gelatine and ventilated with low or high pressure under physiological pH and alkalosis. Outcome parameters were cytokine levels and the wet-to-dry ratio. For cytokine release, murine and human PCLS were incubated in three different buffers and time points...
March 23, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29570757/simulation-of-airflow-in-an-idealized-emphysematous-human-acinus
#13
Amitvikram Dutta, Dragos Vasilescu, James C Hogg, A B Phillion, Joshua R Brinkerhoff
Emphysema is the permanent enlargement of air spaces in the respiratory regions of the lung due to destruction of the inter-alveolar septa. The progressive coalescence of alveoli and alveolar ducts into larger airspaces leads to the disruption of normal airway wall motion and airflow rates within the pulmonary acinus. To contribute to the understanding of the individual effects of emphysema during its earliest stages, computational fluid dynamics simulations of airflow in mathematically-derived models of the pulmonary acinus were performed...
March 21, 2018: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29565180/ablation-of-the-leptin-receptor-in-myeloid-cells-impairs-pulmonary-clearance-of-streptococcus-pneumoniae-and-alveolar-macrophage-bactericidal-function
#14
Peter Mancuso, Jeffrey L Curtis, Christine M Freeman, Marc Peters-Golden, Jason B Weinberg, Martin G Myers
Leptin is a pleiotropic hormone produced by white adipose tissue that regulates appetite and many physiologic functions including the immune response to infection. Genetic leptin deficiency in humans and mice impairs host defenses against respiratory tract infections. Since leptin deficiency is associated with obesity and other metabolic abnormalities, we generated mice that lack the leptin receptor (LepRb) in cells of the myeloid linage (LysM-LepRb-KO) to evaluate its impact in lean metabolically normal mice in a murine model of pneumococcal pneumonia...
March 22, 2018: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29557605/the-impact-of-obesity-on-specific-airway-resistance-and-conductance-among-schoolchildren
#15
Andrea Parraguez Arévalo, Francisco Rojas Navarro, Macarena Ruz Céspedes, Paul Medina González, Máximo Escobar Cabello, Rodrigo Muñoz Cofré
INTRODUCTION: Child and adolescent obesity is an epidemiological problem in developing countries. Its prevalence among preschoolers and schoolchildren is over 30%. It has been associated with a wide range of health complications, including rapid loss of lung function leading to changes in physiology and ventilatory mechanics. The objective of this study was to analyze the association between obesity and the increase in specific airway resistance (sRaw) in a sample of obese children and adolescents from the district of Talca...
April 1, 2018: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/29546563/a-high-flow-nasal-cannula-system-with-relatively-low-flow-effectively-washes-out-co-2-from-the-anatomical-dead-space-in-a-sophisticated-respiratory-model-made-by-a-3d-printer
#16
Yu Onodera, Ryo Akimoto, Hiroto Suzuki, Masayuki Okada, Masaki Nakane, Kaneyuki Kawamae
BACKGROUND: Although clinical studies of the high-flow nasal cannula (HFNC) and its effect on positive end-expiratory pressure (PEEP) have been done, the washout effect has not been well evaluated. Therefore, we made an experimental respiratory model to evaluate the respiratory physiological effect of HFNC. METHODS: An airway model was made by a 3D printer using the craniocervical 3D-CT data of a healthy 32-year-old male. CO2 was infused into four respiratory lung models (normal-lung, open- and closed-mouth models; restrictive- and obstructive-lung, open-mouth models) to maintain the partial pressure of end-tidal CO2 (PET CO2 ) at 40 mmHg...
March 15, 2018: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/29532550/fibroblast-matrix-interplay-nintedanib-and-pirfenidone-modulate-the-effect-of-ipf-fibroblast-conditioned-matrix-on-normal-fibroblast-phenotype
#17
Gali Epstein Shochet, Lutz Wollin, David Shitrit
BACKGROUND AND OBJECTIVE: Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease with poor prognosis. Activated fibroblasts are the key effector cells in fibrosis, producing excessive amounts of collagen and extracellular matrix (ECM) proteins. Whether the ECM conditioned by IPF fibroblasts determines the phenotype of naïve fibroblasts is difficult to explore. METHODS: IPF-derived primary fibroblasts were cultured on Matrigel and then cleared using ammonium hydroxide, creating an IPF-conditioned matrix (CM)...
March 12, 2018: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/29530740/ductus-arteriosus-and-fetal-echocardiography-implications-for-practice
#18
REVIEW
Silvia G V Alvarez, Angela McBrien
The ductus arteriosus (DA) is a crucial part of the fetal circulation, both in the normal fetus and in critical congenital heart disease (CHD). It allows shunting between the pulmonary and systemic circulations. In physiological prenatal conditions, the DA lets the majority of right ventricular output bypass the fluid-filled, high-resistance lungs. The DA can cause hemodynamic compromise in the fetus and neonate when constricted or absent (in isolation or in patients with CHD) and may lead to pre- or postnatal sequelae within other systems when forming part of a vascular ring...
March 7, 2018: Seminars in Fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29527583/role-of-cytochrome-p450s-in-the-generation-and-metabolism-of-reactive-oxygen-species
#19
Alex Veith, Bhagavatula Moorthy
The cytochrome P450 (CYP) enzymes are a diverse group of heme monooxygenases that, through the course of their reaction cycle, contribute to cellular reactive oxygen species (ROS). CYP enzymes play a crucial role in human physiology and are involved in drug and xenobiotic metabolism as well as biosynthesis of endogenous molecules and are expressed throughout the human body. However, during the course of the CYP catalytic cycle, ROS can be generated through uncoupling of the enzymatic cycle. ROS is known to modify endogenous molecules, included lipids, proteins, and nucleic acids, which can lead to cell damage and death and contribute to disease development...
February 2018: Current Opinion in Toxicology
https://www.readbyqxmd.com/read/29495431/evaluation-of-anti-metastatic-potential-of-the-combination-of-fisetin-with-paclitaxel-on-a549-non-small-cell-lung-cancer-cells
#20
Anna Klimaszewska-Wiśniewska, Marta Hałas-Wiśniewska, Alina Grzanka, Dariusz Grzanka
The identification and development of new agents with a therapeutic potential as well as novel drug combinations are gaining the attention of scientists and clinicians as a plausible approach to improve therapeutic regimens for chemoresistant tumors. We have recently reported that the flavonoid fisetin (FIS), at physiologically attainable concentrations, acts synergistically with clinically achievable doses of paclitaxel (PTX) to produce growth inhibitory and pro-death effects on A549 human non-small cell lung cancer (NSCLC) cells...
February 27, 2018: International Journal of Molecular Sciences
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