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Physiology of lung

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https://www.readbyqxmd.com/read/28640808/transmembrane-helical-interactions-in-the-cftr-channel-pore
#1
Jhuma Das, Andrei A Aleksandrov, Liying Cui, Lihua He, John R Riordan, Nikolay V Dokholyan
Mutations in the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene affect CFTR protein biogenesis or its function as a chloride channel, resulting in dysregulation of epithelial fluid transport in the lung, pancreas and other organs in cystic fibrosis (CF). Development of pharmaceutical strategies to treat CF requires understanding of the mechanisms underlying channel function. However, incomplete 3D structural information on the unique ABC ion channel, CFTR, hinders elucidation of its functional mechanism and correction of cystic fibrosis causing mutants...
June 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28637046/the-preoperative-composite-physiologic-index-may-predict-mortality-in-lung-cancer-patients-with-combined-pulmonary-fibrosis-and-emphysema
#2
Fumika Ueno, Yoshiaki Kitaguchi, Takayuki Shiina, Shiho Asaka, Kentaro Miura, Masanori Yasuo, Yosuke Wada, Akihiko Yoshizawa, Masayuki Hanaoka
BACKGROUND: It remains unclear whether the preoperative pulmonary function parameters and prognostic indices that are indicative of nutritional and immunological status are associated with prognosis in lung cancer patients with combined pulmonary fibrosis and emphysema (CPFE) who have undergone surgery. OBJECTIVE: The aim of this study is to identify prognostic determinants in these patients. METHODS: The medical records of all patients with lung cancer associated with CPFE who had undergone surgery at Shinshu University Hospital were retrospectively reviewed to obtain clinical data, including the results of preoperative pulmonary function tests and laboratory examinations, chest high-resolution computed tomography (HRCT), and survival...
June 22, 2017: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/28636403/applying-precision-medicine-to-trial-design-using-physiology-extracorporeal-co2-removal-for-ards
#3
Ewan C Goligher, Marcelo B P Amato, Arthur S Slutsky
In clinical trials of therapies for ARDS, the average treatment effect in the study population may be attenuated because individual patient responses vary widely. This inflates sample size requirements and increases the cost and difficulty of conducting successful clinical trials. One solution is to enrich the study population with patients most likely to benefit based on predicted patient response to treatment (predictive enrichment). In this perspective, we apply the precision medicine paradigm to the emerging use of extracorporeal CO2 removal (ECCO2R) for ultra-protective ventilation in ARDS...
June 21, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28632001/vasodilator-responsiveness-in-idiopathic-pulmonary-arterial-hypertension-identifying-a-distinct-phenotype-with-distinct-physiology-and-distinct-prognosis
#4
David Langleben, Stylianos Orfanos
Within the cohort of patients suffering from idiopathic pulmonary arterial hypertension (IPAH) is a group that responds dramatically (VR-PAH) to an acute vasodilator challenge and that has excellent long-term hemodynamic improvement and prognosis on high dose calcium channel blockers compared with vasodilator non-responders (VN-PAH). For the purposes of diagnosing VR-PAH, there is to date no test to replace the acute vasodilator challenge. However, recent studies have identified markers that may aid in the identification of VR-PAH, including peripheral blood lymphocyte RNA expression levels of desmogelin-2 and Ras homolog gene family member Q, and plasma levels of provirus integration site for Moloney murine leukemia virus...
June 20, 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28631764/-hemodynamic-effects-of-positive-end-expiratory-pressure
#5
Marco Marini, Giorgio Caretta, Fabio Vagnarelli, Fabiana Lucà, Emilia Biscottini, Alberto Lavorgna, Vincenza Procaccini, Letizia Riva, Gabriele Vianello, Nadia Aspromonte, Andrea Mortara, Renata De Maria, Piera Capasso, Serafina Valente, Michele Massimo Gulizia
The application of a positive end-expiratory pressure (PEEP), the cornerstone of noninvasive ventilation (NIV), causes hemodynamic changes in the cardiovascular system. To understand the benefits of NIV it is necessary to resume concepts of cardiovascular physiology and pathophysiology about cardiac function determinants, venous return, ventricular interdependence and heart-lung interaction, and to understand how PEEP interacts with them. The hemodynamic effects of PEEP are mediated by the increase in transpulmonary pressure, which results in increased pulmonary vascular resistance and in an attending small reduction of venous return in conditions of euvolemia, in a substantial reduction of left ventricular afterload and a potential positive effect on left ventricular stroke volume...
June 2017: Giornale Italiano di Cardiologia
https://www.readbyqxmd.com/read/28631513/the-effect-of-labour-pain-in-caesarean-delivery-on-neonatal-and-maternal-outcomes-in-a-term-low-risk-obstetric-population
#6
Meryem Kurek Eken, Gülçin Şahin Ersoy, Sinem Çetinkaya, Çetin Çam, Ateş Karateke
Planned caesarean delivery (CD) frequency is increasing in many countries, and elective CD accounts for 50% of preventable causes of neonatal respiratory morbidity. The clearing of fluid in the lungs is important for the establishment of normal gas exchange with inspired air. A defect in this clearance can result in respiratory problems in neonate, but on the other hand patients waiting for the onset of spontaneous labour pain, the increase in emergency CD, together with severe mortality and morbidity are causes of concern and cause anxiety and distrust of obstetricians...
June 20, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28630905/mechanical-deformation-induces-depolarization-of-neutrophils
#7
Andrew E Ekpenyong, Nicole Toepfner, Christine Fiddler, Maik Herbig, Wenhong Li, Gheorghe Cojoc, Charlotte Summers, Jochen Guck, Edwin R Chilvers
The transition of neutrophils from a resting state to a primed state is an essential requirement for their function as competent immune cells. This transition can be caused not only by chemical signals but also by mechanical perturbation. After cessation of either, these cells gradually revert to a quiescent state over 40 to 120 min. We use two biophysical tools, an optical stretcher and a novel microcirculation mimetic, to effect physiologically relevant mechanical deformations of single nonadherent human neutrophils...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28629919/comparing-pulmonary-nodule-location-during-electromagnetic-bronchoscopy-with-predicted-location-based-on-two-virtual-airway-maps-at-different-phases-of-respiration
#8
Brian S Furukawa, Nicholas J Pastis, Nichole T Tanner, Alexander Chen, Gerard A Silvestri
BACKGROUND: Electromagnetic navigational bronchoscopy (ENB) is guided-bronchoscopy to pulmonary nodules (PN) which relies on a pre-procedural chest CT to create a 3-dimensional (3-D) virtual airway map. The CT is traditionally done at a full inspiratory breath hold (INSP) but the procedure is performed while the patient tidal breaths, where lung volumes are closer to functional residual capacity. Movement of a PN from INSP to expiration (EXP) has been shown to average 17.6 mm. Therefore, the hypothesis of this study is that pre-procedural virtual maps built off a CT closer to physiological lung volumes during bronchoscopy may better represent the actual 3-D location of a PN...
June 16, 2017: Chest
https://www.readbyqxmd.com/read/28629448/azithromycin-for-idiopathic-acute-exacerbation-of-idiopathic-pulmonary-fibrosis-a-retrospective-single-center-study
#9
Kodai Kawamura, Kazuya Ichikado, Yuko Yasuda, Keisuke Anan, Moritaka Suga
BACKGROUND: Acute exacerbation (AE) of idiopathic pulmonary fibrosis (IPF) is a fatal condition without an established pharmaceutical treatment. Most patients are treated with high-dose corticosteroids and broad-spectrum antibiotics. Azithromycin is a macrolide with immunomodulatory activity and may be beneficial for treatment of acute lung injury. The objective of this study was to determine the effect of azithromycin on survival of patients with idiopathic AE of IPF. METHODS: We evaluated 85 consecutive patients hospitalized in our department for idiopathic AE of IPF from April 2005 to August 2016...
June 19, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28629353/lipid-emulsion-mitigates-impaired-pulmonary-function-induced-by-limb-ischemia-reperfusion-in-rats-through-attenuation-of-local-cellular-injury-and-the-subsequent-systemic-inflammatory
#10
Fangfang Xia, Yun Xia, Sisi Chen, Lulu Chen, Weijuan Zhu, Yuanqing Chen, Thomas J Papadimos, Xuzhong Xu, Le Liu
BACKGROUND: Limb ischemia/reperfusion causes inflammation and elicits oxidative stress that may lead to local tissue damage and remote organ such as lung injury. This study investigates pulmonary function after limb ischemia/reperfusion and the protective effect of a lipid emulsion (Intralipid). METHODS: Twenty-four rats were divided into three groups: sham operation group (group S), ischemia/reperfusion group (group IR), and lipid emulsion treatment group (group LE)...
June 19, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28629122/age-related-changes-in-immunological-and-physiological-responses-following-pulmonary-challenge
#11
REVIEW
Edmund J Miller, Helena M Linge
This review examines the current status of knowledge of sepsis and pneumonia in the elderly population and how the dynamics of the pulmonary challenge affects outcome and consequences. Led by an unprecedented shift in demographics, where a larger proportion of the population will reach an older age, clinical and experimental research shows that aging is associated with certain pulmonary changes, but it is during infectious insult of the lungs, as in the case of pneumonia, that the age-related differences in responsiveness and endurance become obvious and lead to a worse outcome than in the younger population...
June 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28625234/-effect-of-global-end-diastolic-volume-index-guidance-fluid-resuscitation-in-elderly-patients-with-septic-shock
#12
Shuang Ma, Rumin Zhang, Shifu Wang, Meiling Zhao, Lei Wang, Yun Zhang
OBJECTIVE: To evaluate the effect of global end diastolic volume index (GEDVI) on fluid resuscitation in elderly patients with septic shock. METHODS: A prospective randomized controlled trial (RCT) was conducted. Septic shock patients over 65 years admitted to intensive care unit (ICU) of Shandong Province, Zibo Central Hospital from January 2013 to December 2015 were enrolled. The patients were randomly divided into control group and observation group, 20 cases in each group...
June 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28624991/a-new-global-and-comprehensive-model-for-icu-ventilator-performances-evaluation
#13
Nicolas S Marjanovic, Agathe De Simone, Guillaume Jegou, Erwan L'Her
BACKGROUND: This study aimed to provide a new global and comprehensive evaluation of recent ICU ventilators taking into account both technical performances and ergonomics. METHODS: Six recent ICU ventilators were evaluated. Technical performances were assessed under two FIO2 levels (100%, 50%), three respiratory mechanics combinations (Normal: compliance [C] = 70 mL cmH2O(-1)/resistance [R] = 5 cmH2O L(-1) s(-1); Restrictive: C = 30/R = 10; Obstructive: C = 120/R = 20), four exponential levels of leaks (from 0 to 12...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28620643/activin-biology-after-lung-transplantation
#14
Glen P Westall, Gregory I Snell, Monika Loskot, Bronwyn Levvey, Robyn O'Hehir, Mark P Hedger, David M de Kretser
BACKGROUND: Activins A and B, members of the TGF-β superfamily, are produced as part of the physiological response to tissue damage and the resulting proinflammatory response. Given that lung allograft reperfusion results in an inflammatory response, it is likely that the activins and their binding protein follistatin will form part of the regulatory response. There is a need to document the response of these proteins to allograft reperfusion to determine if there is a role for the use of follistatin to control the biological actions of the activins because some of these are potentially damaging...
June 2017: Transplantation Direct
https://www.readbyqxmd.com/read/28617990/cell-specific-diversity-in-the-expression-and-organization-of-cytoplasmic-plaque-proteins-of-apical-junctions
#15
Ekaterina Vasileva, Sophie Sluysmans, Marie-Luce Bochaton-Piallat, Sandra Citi
Tight and adherens junctions play critical roles in the barrier, adhesion, and signaling functions of epithelial and endothelial cells. How the molecular organization of these junctions is tuned to the widely diverse physiological requirements of each tissue type is not well understood. Here, we address this question by examining the expression, localization, and interactions of major cytoplasmic plaque proteins of tight and adherens junctions in different cultured epithelial and endothelial cell lines. Immunoblotting and immunofluorescence analyses show that the expression profiles of cingulin, paracingulin, ZO-1, ZO-2, ZO-3, PLEKHA7, afadin, PDZD11, p120-catenin, and α-catenin, as well as the transmembrane junctional proteins occludin, E-cadherin, and VE-cadherin, are significantly diverse when comparing kidney cells (MDCK, mCCD), keratinocytes (HaCaT), lung carcinoma (A427, A549), and endothelium-derived cells (bEnd...
June 15, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28617947/poly-r-c-binding-protein-1-mediated-regulation-of-microrna-expression-underlies-post-sevoflurane-amelioration-of-acute-lung-injury-in-rats
#16
Xiaohong Zhao, Xiaoxia Wang, Fei Wang, Changjie Gao, Jian Wang
BACKGROUND: Acute lung injury (ALI) presents a pervasive health burden due to the high morbidity and mortality associated with it. Volatile anesthetics like sevoflurane has been previously shown to have organ-protective effect, both in the context of normal physiological function in liver, and during LPS-induced ALI. Sevoflurane was shown to exert lung protective effect during LPS-induced ALI by modulating expression level of microRNAs (miRNAs), specifically miR-155. The objective of the current study was to define the underlying mechanism by which sevoflurane alters miRNA expression levels...
June 15, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28617188/molecular-mechanisms-underlying-the-inhibitory-effects-of-qingzaojiufei-decoction-on-tumor-growth-in-lewis-lung-carcinoma
#17
Bin Xie, Xiong Xie, Bin Rao, Shengzhang Liu, Hongning Liu
OBJECTIVE: Qingzaojiufei decoction (QD) is an empirical herbal formula from traditional Chinese medicine that is used for the treatment of lung-related diseases. However, the effect of QD on the growth of lung tumor cells has not been investigated. The aim of this study was to examine the antitumor activity of QD in Lewis lung carcinomas (LLC) in vivo and in vitro, and to elucidate the underlying mechanisms. METHODS: The LLC cells were used to assess the antitumor activity of QD by Cell Counting Kit-8 assay in vitro...
February 1, 2017: Integrative Cancer Therapies
https://www.readbyqxmd.com/read/28615290/a-post-translational-modification-switch-controls-coactivator-function-of-histone-methyltransferases-g9a-and-glp
#18
Coralie Poulard, Danielle Bittencourt, Dai-Ying Wu, Yixin Hu, Daniel S Gerke, Michael R Stallcup
Like many transcription regulators, histone methyltransferases G9a and G9a-like protein (GLP) can act gene-specifically as coregulators, but mechanisms controlling this specificity are mostly unknown. We show that adjacent post-translational methylation and phosphorylation regulate binding of G9a and GLP to heterochromatin protein 1 gamma (HP1γ), formation of a ternary complex with the glucocorticoid receptor (GR) on chromatin, and function of G9a and GLP as coactivators for a subset of GR target genes. HP1γ is recruited by G9a and GLP to GR binding sites associated with genes that require G9a, GLP, and HP1γ for glucocorticoid-stimulated transcription...
June 14, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28615126/unveiling-the-participation-of-avian-kinin-ornithokinin-and-its-receptors-in-the-chicken-inflammatory-response
#19
Rodrigo Guabiraba, Damien Garrido, Geoffrey Bailleul, Angélina Trotereau, Mélanie Pinaud, Anne-Christine Lalmanach, Nathalie K Chanteloup, Catherine Schouler
Vasoactive peptides are key early mediators of inflammation released through activation of different enzymatic systems. The mammalian kinin-kallikrein (K-KLK) system produces bradykinin (BK) through proteolytic cleavage of a kininogen precursor by enzymes named kallikreins. BK acts through specific ubiquitous G-protein coupled receptors (B1R and B2R) to participate in physiological processes and inflammatory responses, such as activation of mononuclear phagocytes. In chickens, the BK-like nonapeptide ornithokinin (OK) has been shown to promote intracellular calcium increase in embryonic fibroblasts and to be vasodilatory in vivo...
June 2017: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/28614921/-the-study-of-using-cordyceps-astragalus-salvia-miltiorrhiza-to-treat-acute-lung-injury-induced-by-paraquat-poisoning-in-rats
#20
Q L Li, J L Liu, J R Wang, X D Jian, B T Kan, Z C Zhang
Objective: To study the therapy of cordyceps-astragalus-salvia miltiorrhiza in treating acute lung injury and pulmonary interstitial fibrosis induced by paraquat poisoning. Methods: All 120 adult Wister male rats were randomly assigned to three groups, the paraquat poisoning group (rats were intragastric administration paraquat 50 mg/kg body weight once at the beginning) , the cordyceps-astragalus-salvia miltiorrhiza therapy group (rats were given cordyceps-astragalus-salvia miltiorrhiza 90 mg/kg body weight intragastric administration half an hour after paraquat was given, then the same dose was given once a day) ; control group (rats were intragastric administration with physiological saline) ...
April 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
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