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Lung mechanics

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https://www.readbyqxmd.com/read/28820897/persistent-infection-due-to-a-small-colony-variant-of-burkholderia-pseudomallei-leads-to-pd-1-upregulation-on-circulating-immune-cells-and-mononuclear-infiltration-in-viscera-of-experimental-balb-c-mice
#1
Jia-Xiang See, Samudi Chandramathi, Mahmood Ameen Abdulla, Jamuna Vadivelu, Esaki M Shankar
BACKGROUND: Melioidosis is a neglected tropical disease endemic across South East Asia and Northern Australia. The etiological agent, Burkholderia pseudomallei (B.pseudomallei), is a Gram-negative, rod-shaped, motile bacterium residing in the soil and muddy water across endemic regions of the tropical world. The bacterium is known to cause persistent infections by remaining latent within host cells for prolonged duration. Reactivation of the recrudescent disease often occurs in elders whose immunity wanes...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28820530/cxcr7-attenuates-the-tgf-%C3%AE-induced-endothelial-to-mesenchymal-transition-and-pulmonary-fibrosis
#2
Shuhong Guan, Jun Zhou
Lung fibrosis is a progressive and often fatal lung disease characterized by fibroblast proliferation and excessive deposition of extracellular matrix in the lungs. The chemokine receptor CXCR7 has been shown to control cell adhesion, migration and proliferation by regulating the epithelial-to-mesenchymal transition (EMT), but the role of CXCR7 in regulating the endothelial-to-mesenchymal transition (EndMT) and lung fibrosis remains largely unclear. In this study, we investigated the interrelation of CXCR7 and TGF-β, a crucial player in lung fibrogenesis...
August 18, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28820027/atelectasis-after-airway-extubation-during-veno-arterial-extracorporeal-membrane-oxygenation-support
#3
Hong Wang, Ming Jia, Bin Mao, Xiaotong Hou
Veno-arterial extracorporeal membrane oxygenation (VA ECMO) is used in cardiopulmonary failure patients to provide temporary assisted circulation. Usually, prolonged intubation and invasive mechanical ventilation are required in patients with ECMO support. We report on two cases of patients who had no pre-existing injuries of the affected lung, underwent VA ECMO support after open-heart surgery and received airway extubation (AE) or awake ECMO with the recovery of left ventricular ejection fraction. Atelectasis happened after AE and non-invasive positive pressure ventilation attenuated the atelectasis of one patient...
September 2017: Perfusion
https://www.readbyqxmd.com/read/28819748/lipoxin-a4-attenuates-bronchopulmonary-dysplasia-via-upregulation-of-let-7c-and-downregulation-of-tgf-%C3%AE-1-signaling-pathway
#4
Xiao-Qing Chen, Sheng-Hua Wu, Yan-Yan Luo, Bing-Jie Li, Shu-Jun Li, Hong-Yan Lu, Rui Jin, Zhong-Yi Sun
Transforming growth factor-β (TGF-β) superfamily members are key regulators for lung development and progress of bronchopulmonary dysplasia (BPD). The mechanisms by which lipoxin A4 (LXA4) attenuates development of BPD have not been clarified. Neonatal murine BPD models were inducted by hyperoxia treatment. Neonatal mice were exposed to room air or 85% O2 hyperoxia with or without treatment with 5S,6R-methyl-LXA4 or anti-TGF-β antibodies. Mouse lung epithelial cells (MLE-12 cells) and mouse embryonic fibroblasts (NIH/3T3 cells) were cultured in room air or 85% O2 followed by treatment of LXA4, anti-TGF-β antibodies, and let-7c mimic/anti-microRNA transfections...
August 17, 2017: Inflammation
https://www.readbyqxmd.com/read/28819672/folding-sticky-elastica-dynamics-and-reversibility-of-folds-in-langmuir-monolayers
#5
L C Foucard, J M Eaton, M Dennin, Alex J Levine
Lipid monolayers at the air/water interface are often subject to large mechanical stresses when compressed laterally. For large enough compression they fold in the out-of-plane direction to relax stress. The repetitive folding and unfolding of lung surfactant monolayers during breathing plays a critical role in conserving monolayer material at the air/water interface lining the lung. Although the mechanisms behind the folding have been explored recently, relatively little information exists regarding the implications of folding dynamics on the long-term stability of the monolayer...
August 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28819664/antimicrobial-carbon-nanospheres
#6
Yao-Wen Jiang, Ge Gao, Xiaodong Zhang, Hao-Ran Jia, Fu-Gen Wu
Carbon nanomaterials have found numerous applications in various fields. However, their synthesis and functionalization usually require complicated procedures or tough experimental conditions. Herein, we report for the first time the synthesis of a new type of functional nanomaterial, quaternized carbon nanospheres (QCNSs), with superior antibacterial activity via a one-pot hydrothermal treatment of chitosan and hexadecylbetaine (abbreviated as BS-16). During the hydrothermal process, the direct reaction and carbonization between the amine-containing chitosan and the carboxyl-containing BS-16 were realized within only one step...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819582/relationship-of-metabolic-alterations-and-pd-l1-expression-in-cisplatin-resistant-lung-cancer
#7
M Wangpaichitr, H Kandemir, Y Y Li, C Wu, Djm Nguyen, L G Feun, M T Kuo, N Savaraj
Despite numerous reports on immune checkpoint inhibitor for the treatment of non-small cell lung cancer (NSCLC), the response rate remains low but durable. Thus cisplatin still plays a major role in the treatment of NSCLC. While there are many mechanisms involved in cisplatin resistance, alteration in metabolic phenotypes with elevated levels of reactive oxygen species (ROS) are found in several cisplatin resistant tumors. These resistant cells become more reliant on mitochondria oxidative metabolism instead of glucose...
April 28, 2017: Cell & Developmental Biology
https://www.readbyqxmd.com/read/28819438/elevated-expression-of-derlin-1-associates-with-unfavorable-survival-time-of-squamous-cell-carcinoma-of-the-head-and-neck-and-promotes-its-malignance
#8
Leiming Pi, Gangcai Zhu, Li She, Ming Wei, Guancheng Liu, Changhan Chen, Di Hu, Fusen Peng, Haolei Tan, Yong Liu, Donghai Huang, Yongquan Tian, Xin Zhang
Derlin-1 is over-expressed to function as an oncoprotein in breast, lung and colon cancers. However, the implications of Derlin-1 involved in squamous cell carcinoma of the head and neck (SCCHN) remain unknown. This study aims to investigate the effects of Derlin-1 expression on SCCHN tissues and cells. The potential mechanism of Derlin-1 regulating SCCHN cell proliferation, apoptosis and metastasis was also indicated in this work. Western blot and immunohistochemistry (IHC) assays showed that Derlin-1 was over-expressed in 114 SCCHN samples and five SCCHN cell lines...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819419/osteopontin-a-promising-biomarker-for-cancer-therapy
#9
REVIEW
Ran Wei, Janet Pik Ching Wong, Hang Fai Kwok
Osteopontin (OPN), a multifunctional protein, has emerged as a potentially valuable biomarker for diagnosing and treating cancers. Recent research focuses on its involvement in tumor biology including the cell proliferation, survival, angiogenesis, invasion, and metastasis. Understanding the molecular mechanisms and pharmacological effects of OPN in cancer development could lead to new targets for improving cancer diagnosis and treatment. This review explains how the structurally conserved domains of OPN are associated with OPN signaling mediators and CD44, and how the conserved OPN domains determine biological functions...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819407/ccr7-promote-lymph-node-metastasis-via-regulating-vegf-c-d-r3-pathway-in-lung-adenocarcinoma
#10
Jie Yu, Shaolin Tao, Pingping Hu, Ruwen Wang, Chunshu Fang, Yi Xu, Di Qi, Zhuanqin Wei, Jingge Zhang, Qunyou Tan
Lymph node metastasis is still an important issue in metastatic process of lung adenocarcinoma. C-C chemokine receptor 7 (CCR7) has been proved to be closely associated with the metastasis of lung adenocarcinoma, and the mechanism is poorly understood. In order to investigate the relationship between CCR7 and lymph node metastasis in lung adenocarcinoma, and to explore the role of CCR7 in treating lung adenocarcinoma, 40 clinical specimens were collected to define the relationship between CCR7 and lymph node metastasis in lung adenocarcinoma by immunohistochemistry...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819399/outcomes-of-cancer-therapy-administered-to-treatment-na%C3%A3-ve-lung-cancer-patients-in-the-intensive-care-unit
#11
Yen-Fu Chen, Jou-Wei Lin, Chao-Chi Ho, Ching-Yao Yang, Chia-Hao Chang, Tao-Min Huang, Chung-Yu Chen, Kuan-Yu Chen, Jin-Yuan Shih, Chong-Jen Yu
Objectives: Therapy outcomes for newly diagnosed, critically ill lung cancer patients have seldom been evaluated. This study evaluated therapy outcomes for treatment-naïve lung cancer patients in the intensive care unit (ICU). Materials and Methods: Patients were excluded if they had previously received lung cancer treatment, such as systemic chemotherapy, targeted therapy, radiotherapy, or surgical lung resection before ICU admission. The therapeutic strategies for the treatment-naïve patients were determined while they were in the ICU...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28819305/cardiorespiratory-pathogenesis-of-sickle-cell-disease-in-a-mouse-model
#12
Jun Ren, Xiuqing Ding, Marie Trudel, John J Greer, Joanna E MacLean
The nature and development of cardiorespiratory impairments associated with sickle cell disease are poorly understood. Given that the mechanisms of these impairments cannot be addressed adequately in clinical studies, we characterized cardiorespiratory pathophysiology from birth to maturity in the sickle cell disease SAD mouse model. We identified two critical phases of respiratory dysfunction in SAD mice; the first prior to weaning and the second in adulthood. At postnatal day 3, 43% of SAD mice showed marked apneas, anemia, and pulmonary vascular congestion typical of acute chest syndrome; none of these mice survived to maturity...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819176/use-of-biocompatible-sorafenib-gold-nanoconjugates-for-reversal-of-drug-resistance-in-human-hepatoblatoma-cells
#13
Sandeep Kumar Vishwakarma, Priyanka Sharmila, Avinash Bardia, Lakkireddy Chandrakala, N Raju, G Sravani, B V S Sastry, Md Aejaz Habeeb, Aleem Ahmed Khan, Marshal Dhayal
The present study identifies the potential of highly biocompatible SF-GNP nano-conjugate to enhance the chemotherapeutic response to combat drug resistance in cancer cells. We developed a stable colloidal suspension of sorafenib-gold nanoconjugate (SF-GNP) of <10 nm size in aqueous medium for reverting the cancer drug resistance in SF-resistant HepG2 cells in a 3D ex-vivo model system. In-vivo biocompatibility assay of SF-GNPs showed absence of systemic toxicological effects including hematological, biochemical and histological parameters...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819007/effects-of-antenatal-melatonin-therapy-on-lung-structure-in-growth-restricted-newborn-lambs
#14
Graeme R Polglase, Jade Barbuto, Beth J Allison, Tamara Yawno, Amy Elizabeth Sutherland, Atul Malhotra, Keith E Schulze, Euan M Wallace, Graham Jenkin, Sharon D Ricardo, Suzanne L Miller
BACKGROUND: Oxidative stress arising from suboptimal placental function contributes to a multitude of pathologies in infants compromised by fetal growth restriction (FGR). FGR infants are at high risk for respiratory dysfunction after birth and poor long-term lung function. OBJECTIVES: To investigate the contribution of oxidative stress to adverse lung development and the effects of melatonin administration, a powerful anti-oxidant, on lung structure in FGR lambs...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28819002/feedback-modulation-of-surrounding-pressure-determines-the-onset-of-negative-effort-dependence-in-a-collapsible-tube-bench-model-of-the-pharyngeal-airway
#15
Christopher Lambeth, Benjamin Kolevski, Terence Charles Amis, Kristina Kairaitis
Negative effort dependence (NED), decreased airflow despite increased driving pressure, has been proposed as a specific obstructive sleep apnea (OSA) phenotypic characteristic. We examined conditions under which NED occurs in a collapsible tube, chamber enclosed, pharyngeal airway bench model, focusing on relationships with surrounding pressure levels and longitudinal strain. Using a vacuum source, graded airflows (V ̇, 0-5 L/s) were generated through a thin walled latex tube enclosed within a rigid, cylindrical chamber, sealed with initial chamber pressures (Pci) of 0-5 cmH2O (separate runs), or open to atmosphere...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28818610/surfactant-and-continuous-positive-airway-pressure-for-the-prevention-of-chronic-lung-disease-history-reality-and-new-challenges
#16
REVIEW
Hany Aly, Mohamed A Mohamed, Jen-Tien Wung
The discovery of surfactant was one of the most significant research events to occur in the history of neonatology. Certainly, surfactant saved lives for premature infants who were otherwise considered non-viable. However, the prevention of chronic lung disease did not progress and it became clear that a significant portion of the help surfactant provides to the premature lung is counteracted by mechanical ventilation. A dilemma exists over the priorities in premature management to intubate and administer surfactant or not to intubate and support these infants non-invasively with the use of continuous positive airway pressure...
August 14, 2017: Seminars in Fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28818608/potential-resistance-mechanisms-revealed-by-targeted-sequencing-from-lung-adenocarcinoma-patients-with-primary-resistance-to-epidermal-growth-factor-receptor-egfr-tyrosine-kinase-inhibitors-tkis
#17
Jia Zhong, Lei Li, Zhijie Wang, Hua Bai, Gai Fei, Jian Chunduan, Jun Zhao, Minglei Zhuo, Yuyang Wang, Shuhang Wang, Wanchun Zang, Meina Wu, Tongtong An, Guanhua Rao, Jie Wang
BACKGROUND: EGFR-TKIs have greatly improved the prognosis of lung adenocarcinoma. However, approximately 5%-10% lung adenocarcinoma patients with EGFR sensitive mutations have primary resistance to EGFR-TKIs treatment. The underlying mechanism is unknown. METHODS: This study used next-generation sequencing (NGS) to explore the mechanisms of primary resistance by analyzing 11 patients with primary resistance and 11 patients sensitive to EGFR-TKIs. NGS targeted sequencing was performed on the Illumina X platform for 483 cancer-related genes...
August 14, 2017: Journal of Thoracic Oncology
https://www.readbyqxmd.com/read/28818606/recent-advances-in-targeting-ros1-in-lung-cancer
#18
REVIEW
Jessica J Lin, Alice T Shaw
ROS1 is a validated therapeutic target in non-small cell lung cancer (NSCLC). In a phase I study, the multi-targeted MET/ALK/ROS1 inhibitor crizotinib demonstrated remarkable efficacy in ROS1-rearranged NSCLCs, and consequently gained approval by the United States Food and Drug Administration as well as the European Medicines Agency in 2016. However, similar to other oncogene-driven lung cancers, ROS1-rearranged lung cancers treated with crizotinib eventually acquire resistance, leading to disease relapse. Novel ROS1 inhibitors and therapeutic strategies are therefore needed...
August 14, 2017: Journal of Thoracic Oncology
https://www.readbyqxmd.com/read/28818492/-dexmedetomidine-preconditioning-protects-against-lipopolysaccharides-induced-injury-in-the-human-alveolar-epithelial-cells
#19
Lei Zhang, Xian-Jin Zhou, Li-Ying Zhan, Xiao-Jing Wu, Wen-Lan Li, Bo Zhao, Qing-Tao Meng, Zhong-Yuan Xia
BACKGROUND AND OBJECTIVES: Dexmedetomidine (DEX) has demonstrated the preconditioning effect and shown protective effects against organize injury. In this study, using A549 (human alveolar epithelial cell) cell lines, we investigated whether DEX preconditioning protected against acute lung injury (ALI) in vitro. METHODS: A549 were randomly divided into four groups (n=5): control group, DEX group, lipopolysaccharides (LPS) group, and D-LPS (DEX+LPS) group. Phosphate buffer saline (PBS) or DEX were administered...
August 14, 2017: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/28818484/the-physiology-of-submaximal-exercise-the-steady-state-concept
#20
REVIEW
Guido Ferretti, Nazzareno Fagoni, Anna Taboni, Paolo Bruseghini, Giovanni Vinetti
The steady state concept implies that the oxygen flow is invariant and equal at each level along the respiratory system. The same is the case with the carbon dioxide flow. This condition has several physiological consequences, which are analysed. First, we briefly discuss the mechanical efficiency of exercise and the energy cost of human locomotion, as well as the roles played by aerodynamic work and frictional work. Then we analyse the equations describing the oxygen flow in lungs and in blood, the effects of ventilation and of the ventilation - perfusion inequality, and the interaction between diffusion and perfusion in the lungs...
August 14, 2017: Respiratory Physiology & Neurobiology
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