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Alveolar macrophage

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https://www.readbyqxmd.com/read/28448535/alpha-1-antitrypsin-supplementation-improves-alveolar-macrophages-efferocytosis-and-phagocytosis-following-cigarette-smoke-exposure
#1
Karina A Serban, Daniela N Petrusca, Andrew Mikosz, Christophe Poirier, Angelia D Lockett, Lauren Saint, Matthew J Justice, Homer L Twigg, Michael A Campos, Irina Petrache
Cigarette smoking (CS), the main risk factor for COPD (chronic obstructive pulmonary disease) in developed countries, decreases alveolar macrophages (AM) clearance of both apoptotic cells and bacterial pathogens. This global deficit of AM engulfment may explain why active smokers have worse outcomes of COPD exacerbations, episodes characterized by airway infection and inflammation that carry high morbidity and healthcare cost. When administered as intravenous supplementation, the acute phase-reactant alpha-1 antitrypsin (A1AT) reduces the severity of COPD exacerbations in A1AT deficient (AATD) individuals and of bacterial pneumonia in murine models, but the effect of A1AT on AM scavenging functions has not been reported...
2017: PloS One
https://www.readbyqxmd.com/read/28440496/pu-1-serves-a-critical-role-in-the-innate-defense-against-aspergillus%C3%A2-fumigatus-via-dendritic-cell-associated-c-type-lectin-receptor-1-and-toll-like-receptors-2-and-4-in-thp-1-derived-macrophages
#2
Chenyang Liu, Min Wang, Wenkui Sun, Feng Cai, Shen Geng, Xin Su, Yi Shi
Aspergillus fumigatus (A. fumigatus) is one of the most common fungal pathogens of invasive pulmonary aspergillosis (IPA), which may be life threatening in immunocompromised individuals. The dendritic cell-associated C-type lectin receptor (Dectin-1), toll‑like receptor (TLR)-2 and TLR-4 are major pattern recognition receptors in alveolar macrophages that recognize A. fumigatus components. The PU.1 transcription factor is known to be important for the transcriptional control of these three receptors in mature macrophages...
April 24, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28428003/rac1-signaling-regulates-cigarette-smoke-induced-inflammation-in-the-lung-via-the-erk1-2-mapk-and-stat3-pathways
#3
Jun-Xia Jiang, Shui-Juan Zhang, Hui-Juan Shen, Yan Guan, Qi Liu, Wei Zhao, Yong-Liang Jia, Jian Shen, Xiao-Feng Yan, Qiang-Min Xie
Cigarette smoke (CS) is a major risk factor for the development of chronic obstructive pulmonary disease (COPD). Our previous studies have indicated that Rac1 is involved in lipopolysaccharide-induced pulmonary injury and CS-mediated epithelial-mesenchymal transition. However, the contribution of Rac1 activity to CS-induced lung inflammation remains not fully clear. In this study, we investigated the regulation of Rac1 in CS-induced pulmonary inflammation. Mice or 16HBE cells were exposed to CS or cigarette smoke extract (CSE) to induce acute inflammation...
April 17, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28424239/aim2-inflammasome-is-critical-for-influenza-induced-lung-injury-and-mortality
#4
Hongbo Zhang, Jiadi Luo, John F Alcorn, Kong Chen, Songqing Fan, Joseph Pilewski, Aizhong Liu, Wei Chen, Jay K Kolls, Jieru Wang
The absent in melanoma 2 (AIM2) inflammasome plays an important role in many viral and bacterial infections, but very little is known about its role in RNA virus infection, including influenza A virus (IAV). In this study, we have designed in vivo and in vitro studies to determine the role of AIM2 in infections with lethal doses of IAVs A/PR8/34 and A/California/07/09. In wild-type mice, IAV infection enhanced AIM2 expression, induced dsDNA release, and stimulated caspase-1 activation and release of cleaved IL-1β in the lung, which was significantly reduced in AIM2-deficient mice...
April 19, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28422970/the-gut-microbiota-as-a-modulator-of-innate-immunity-during-melioidosis
#5
Jacqueline M Lankelma, Emma Birnie, Tassili A F Weehuizen, Brendon P Scicluna, Clara Belzer, Riekelt H Houtkooper, Joris J T H Roelofs, Alex F de Vos, Tom van der Poll, Andries E Budding, W Joost Wiersinga
BACKGROUND: Melioidosis, caused by the Gram-negative bacterium Burkholderia pseudomallei, is an emerging cause of pneumonia-derived sepsis in the tropics. The gut microbiota supports local mucosal immunity and is increasingly recognized as a protective mediator in host defenses against systemic infection. Here, we aimed to characterize the composition and function of the intestinal microbiota during experimental melioidosis. METHODOLOGY/PRINCIPAL FINDINGS: C57BL/6 mice were infected intranasally with B...
April 19, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28421819/il-4-induces-the-il17rb-gene-transcription-in-monocytic-cells-with-coordinate-autocrine-il-25-signaling
#6
Nathaniel M Weathington, Shreya S Kanth, Qiaoke Gong, James Londino, Akihiko Hoji, Mauricio Rojas, John Trudeau, Sally Wenzel, Rama K Mallampalli
IL-25 and IL-4 signaling in the setting of infection or allergic responses can drive Type 2 inflammation. IL-25 requires the IL-17 receptor B (IL-17Rb) to mediate signaling through nuclear factor kappa B transcriptional activation. Despite the known coexistence of these two cytokines in the Type 2 inflammatory environment, collaborative signaling between the IL-4 and IL-25 axes is poorly explored. Here we demonstrate IL-4 induction of both IL-25 and IL-17Rb protein in human lung tissue culture, primary alveolar macrophages, and the THP-1 monocytic cell line...
April 19, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28421818/cell-origin-dictates-programming-of-resident-versus-recruited-macrophages-during-acute-lung-injury
#7
Kara J Mould, Lea Barthel, Michael P Mohning, Stacey M Thomas, Alexandra L McCubbrey, Thomas Danhorn, Sonia M Leach, Tasha E Fingerlin, Brian P O'Connor, Julie A Reisz, Angelo D'Alessandro, Donna L Bratton, Claudia V Jakubzick, William J Janssen
Two populations of alveolar macrophages (AMs) co-exist in the inflamed lung: resident AMs that arise during embryogenesis, and recruited AMs that originate postnatally from circulating monocytes. The objective of this study was to determine whether origin or environment dictates the transcriptional, metabolic, and functional programming of these two ontologically distinct populations over the time course of acute inflammation. RNA sequencing demonstrated marked transcriptional differences between resident and recruited AMs affecting three main areas: proliferation, inflammatory signaling, and metabolism...
April 19, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28421817/sequential-gm-csf-inhalation-after-whole-lung-lavage-for-pulmonary-alveolar-proteinosis-a-report-of-five-intractable-cases
#8
Shinya Ohkouchi, Keiichi Akasaka, Toshio Ichiwata, Shu Hisata, Hideya Iijima, Toshinori Takada, Hiroki Tsukada, Hideaki Nakayama, Jun-Ichi Machiya, Toshiya Irokawa, Hiromasa Ogawa, Yoko Shibata, Masakazu Ichinose, Masahito Ebina, Toshihiro Nukiwa, Hajime Kurosawa, Koh Nakata, Ryushi Tazawa
Autoimmune pulmonary alveolar proteinosis (aPAP) is a rare disease characterized by the excessive accumulation of surfactant proteins within the alveolar spaces and by higher titers of autoantibodies to granulocyte/macrophage colony stimulating factor (GM-CSF) in the serum and bronchoalveolar lavage fluid (BALF). The antibodies inhibit the maturation and phagocytosis of alveolar macrophages (AMs). Although the standard therapy for aPAP has been whole-lung lavage (WLL), this procedure is invasive and needs to be repeated for several years...
April 19, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28420398/mechanisms-of-corticosteroid-insensitivity-in-copd-alveolar-macrophages-exposed-to-nthi
#9
Rana M Khalaf, Simon R Lea, Hannah J Metcalfe, Dave Singh
BACKGROUND: Non-typeable Haemophilus influenza (NTHi) infection is common in COPD. Corticosteroids can have limited therapeutic effects in COPD patients. NTHi causes corticosteroid insensitive cytokine production from COPD alveolar macrophages. We investigated the mechanisms by which NTHi causes corticosteroid insensitive inflammatory responses, and the effects of NTHi exposure on COPD macrophage polarisation. METHOD: Alveolar macrophages from COPD patients and controls were exposed to NTHi in conjunction with the corticosteroid dexamethasone and/or the p38 MAPK inhibitor BIRB-796...
April 18, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28415830/triptolide-mitigates-radiation-induced-pneumonitis-via-inhibition-of-alveolar-macrophages-and-related-inflammatory-molecules
#10
Chun Chen, Shanmin Yang, Mei Zhang, Zhenhuan Zhang, Steven B Zhang, Bing Wu, Jinsheng Hong, Weijian Zhang, Jianhua Lin, Paul Okunieff, Lurong Zhang
Ionizing radiation-induced pulmonary injury is a major limitation of radiotherapy for thoracic tumors. We have demonstrated that triptolide (TPL) could alleviate IR-induced pneumonia and pulmonary fibrosis. In this study, we explored the underlying mechanism by which TPL mitigates the effects of radiotoxicity. The results showed that:(1) Alveolar macrophages (AMs) were the primary inflammatory cells infiltrating irradiated lung tissues and were maintained at a high level for at least 17 days, which TPL could reduce by inhibiting of the production of macrophage inflammatory protein-2 (MIP-2) and its receptor CXCR2...
March 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28414823/comparing-in-vitro-and-in-vivo-virulence-phenotypes-of-burkholderia-pseudomallei-type-g-strains
#11
Eric R G Lewis, Paul B Kilgore, Tiffany M Mott, Gonzalo A Pradenas, Alfredo G Torres
Burkholderia pseudomallei (Bpm) is a saprophytic rod-shaped gram-negative bacterium and the causative agent of melioidosis. This disease has previously been described as endemic in areas such as northern Australia and Southeast Asia, but, more recently, a better understanding of the epidemiology of melioidosis indicated that the disease is distributed worldwide, including regions of the Americas and Africa. A 16S-23S rDNA internal transcribed spacer (ITS) typing system has been developed for Bpm and has revealed that ITS types C, E, and hybrid CE are mainly associated with Australia and Southeast Asia while type G strains are more associated with cases of melioidosis in the Western Hemisphere...
2017: PloS One
https://www.readbyqxmd.com/read/28413934/commonly-used-air-filters-fail-to-eliminate-secondhand-smoke-induced-oxidative-stress-and-inflammatory-responses
#12
Thivanka Muthumalage, Karen Pritsos, Kenneth Hunter, Chris Pritsos
Secondhand smoke (SHS) causes approximately 50,000 deaths per year. Despite all the health warnings, smoking is still allowed indoors in many states exposing both workers and patrons to SHS on a daily basis. The opponents of smoking bans suggest that the present day air filtration systems remove the health hazards of exposure to SHS. In this study, using an acute SHS exposure model, we looked at the impact of commonly used air filters (MERV 8 pleated and MERV 8 pleated activated charcoal) on SHS by assessing the inflammatory response and the oxidative stress response in C57BL/6 mice...
April 16, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/28412392/diminished-airway-macrophage-expression-of-the-axl-receptor-tyrosine-kinase-is-associated-with-defective-efferocytosis-in-asthma
#13
Aleksander M Grabiec, Nicholas Denny, John A Doherty, Kaisa E Happonen, Jenny Hankinson, Emma Connolly, Mark E Fife, Toshifumi Fujimori, Naoya Fujino, Anu Goenka, Susan Holden, Gaël Tavernier, Rajesh Shah, Peter C Cook, Andrew S MacDonald, Robert M Niven, Björn Dahlbäck, Stephen J Fowler, Angela Simpson, Tracy Hussell
The apoptotic cell recognition receptor Axl is highly expressed on human airway/alveolar macrophages, its expression is driven by the lung microenvironment and is significantly reduced in asthma, which may explain defects in apoptotic cell clearance.
April 12, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28410559/the-irony-of-iron-overload-and-iron-deficiency-in-chronic-obstructive-pulmonary-disease
#14
Suzanne M Cloonan, Sharon Mumby, Ian M Adcock, Augustine M K Choi, Kian Fan Chung, Gregory J Quinlan
Chronic obstructive pulmonary disease (COPD) is a debilitating inflammatory lung disease associated with cigarette smoking and is third leading cause of death worldwide. With the recent emergence of genome wide association studies (GWAS), the identification of multiple COPD susceptibility genes has enhanced and expanded our understanding of the pathogenic mechanisms associated with this debilitating lung disease. An example of such a pathogenic mechanism is the role of iron metabolism in the onset and progression of COPD...
April 14, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28410469/18%C3%AE-glycyrrhetinic-acid-the-major-bioactive-component-of-glycyrrhizae-radix-attenuates-airway-inflammation-by-modulating-th2-cytokines-gata-3-stat6-and-foxp3-transcription-factors-in-an-asthmatic-mouse-model
#15
Seung-Hyung Kim, Jung-Hee Hong, Ji-Eun Lee, Young-Cheol Lee
18β-Glycyrrhetinic acid (18Gly), the major bioactive component of Glycyrrhizae Radix, possesses anti-ulcerative, anti-inflammatory, and other pharmacological properties. Although 18Gly is associated with immunoregulatory functions of allergic diseases, the pathophysiological mechanisms of 18Gly action in allergic inflammatory lung disease have not been examined. Moreover, there are no in vivo studies on the anti-asthmatic effects of 18Gly in allergic asthma. We investigated its effect and mechanism of action in airway inflammation in a BALB/c mouse model of allergic asthma...
March 20, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28408365/immunomodulators-targeting-marco-expression-improve-resistance-to-post-influenza-bacterial-pneumonia
#16
Muzo Wu, John G Gibbons, Glen M Deloid, Alice S Bedugnis, Rajesh K Thimmulappa, Shyam Biswal, Lester Kobzik
Down-regulation of the alveolar macrophage (AM) macrophage receptor with collagenous structure (MARCO) leads to susceptibility to post-influenza bacterial pneumonia, a major cause of morbidity and mortality. We sought to determine whether immunomodulation of MARCO could improve host defense and resistance to secondary bacterial pneumonia. RNAseq analysis identified a striking increase of MARCO expression between days 9 and 11 after influenza infection and indicated important roles for Akt and Nrf2 in MARCO recovery...
April 13, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28403845/hemosiderin-in-sputum-macrophages-may-predict-infective-exacerbations-of-chronic-obstructive-pulmonary-disease-a-retrospective-observational-study
#17
Sindu Mohan, Terence Ho, Melanie Kjarsgaard, Katherine Radford, A S M Borhan, Lehana Thabane, Parameswaran Nair
BACKGROUND: Infective exacerbations of COPD are common and are accompanied by neutrophilic bronchitis in sputum. Increased respiratory iron content has been associated with respiratory tract infection, though it is unclear if this represents a predisposing factor for infection or the sequelae of inflammation. Iron overload, as assessed in the airways, may be an important biomarker for recurrent infective exacerbations of COPD. The purpose of our study was to determine if hemosiderin in sputum macrophages is related to infective exacerbations of COPD...
April 12, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28402952/caveolin-1-scaffolding-domain-peptides-enhance-anti-inflammatory-effect-of-heme-oxygenase-1-through-interrupting-its-interact-with-caveolin-1
#18
Ping Weng, Xiao-Tong Zhang, Qiong Sheng, Wen-Fang Tian, Jun-Liang Chen, Jia-Jia Yuan, Ji-Ru Zhang, Qing-Feng Pang
Caveolin-1(Cav-1) scaffolding domain (CSD) peptides compete with the plasma membrane Cav-1, inhibit the interaction of the proteins and Cav-1, and re-store the functions of Cav-1 binding proteins. Heme oxygenase-1 (HO-1) binds to Cav-1 and its enzymatic activity was inhibited. In this study, we investigated the effect of CSD peptides on interaction between HO-1 and Cav-1, and on the HO-1 activity in vitro and in vivo. Our data showed that CSD peptides decreased the compartmentalization of HO-1 and Cav-1, and increased the HO-1 activity both in LPS-treated alveolar macrophages and in mice...
March 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28402755/distribution-of-fcrn-across-species-and-tissues
#19
Sari Latvala, Bjoern Jacobsen, Michael B Otteneder, Annika Herrmann, Sven Kronenberg
The neonatal Fc receptor (FcRn) is a major histocompatibility complex class I type molecule that binds to, transports, and recycles immunoglobulin G (IgG) and albumin, thereby protecting them from lysosomal degradation. Therefore, besides the knowledge of FcRn affinity, FcRn protein expression is critical in understanding the pharmacokinetic behavior of Fc-containing biotherapeutics such as monoclonal antibodies. The goal of this investigation was to achieve for the first time a comparative assessment of FcRn distribution across a variety of tissues and species...
April 1, 2017: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
https://www.readbyqxmd.com/read/28402743/generation-and-application-of-monoclonal-antibody-against-lycopene
#20
Valeriy V Tsibezov, Yuriy K Bashmakov, Dmitry V Pristenskiy, Naylia A Zigangirova, Ludmila V Kostina, Natalya E Chalyk, Alexey Y Kozlov, Elena Y Morgunova, Marina P Chernyshova, Marina V Lozbiakova, Nigel H Kyle, Ivan M Petyaev
A monoclonal antibody (Mab) against lycopene was developed from hybridoma clones obtained from BALB/c mice immunized with trans-isomer of lycopene (t-lycopene, t-LC) conjugated with colloidal gold particles. An alternating immunization schedule which included injection of both formulations of immunogen (without and with Freund's adjuvant) was most effective in the elucidation of a measurable immune response to the t-Lycopene conjugate. Selected hybridoma clones were able to produce an Mab positive in competition assay...
April 12, 2017: Monoclonal Antibodies in Immunodiagnosis and Immunotherapy
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