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https://www.readbyqxmd.com/read/29052963/deficiency-of-p38%C3%AE-in-macrophage-ameliorates-d-galactosamine-tnf-%C3%AE-induced-acute-liver-injury-in-mice
#1
Jiao Liu, Shengjie Zhang, Hongchao Cao, Hui Wang, Chao Sun, Shengnan Liu, Shuxian Yu, Yan Li, Wei Liu, Hui Wang, Jingjing Jiang, Hao Ying
Growing evidence suggests that hepatic macrophages play an important role in tissue repair after liver injury by coordinating the induction and resolution of inflammation, removing apoptotic cells and promoting hepatocyte proliferation. Understanding the role of macrophage in the pathogenesis of liver injury will help pave the way to future therapeutics. Here we investigated whether macrophage p38α plays a regulatory role in the tissue repair following a GalN/TNF-α-induced acute liver injury. We found that macrophage p38α deficient mice displayed decreased mortality and relieved liver injury as evident from less apoptosis, accelerated regeneration, decreased granulocytes recruitment, monocytes infiltration, and cytokine production after GalN/TNF-α treatment...
October 20, 2017: FEBS Journal
https://www.readbyqxmd.com/read/29051759/ifn%C3%AE-enhances-cd64-potentiated-phagocytosis-of-treponema-pallidum-opsonized-with-human-syphilitic-serum-by-human-macrophages
#2
Kelly L Hawley, Adriana R Cruz, Sarah J Benjamin, Carson J La Vake, Jorge L Cervantes, Morgan LeDoyt, Lady G Ramirez, Daniza Mandich, Mary Fiel-Gan, Melissa J Caimano, Justin D Radolf, Juan C Salazar
Syphilis is a multi-stage, sexually transmitted disease caused by the spirochete Treponema pallidum (Tp). Considered broadly, syphilis can be conceptualized as a dualistic process in which spirochete-driven inflammation, the cause of clinical manifestations, coexists to varying extents with bacterial persistence. Inflammation is elicited in the tissues, along with the persistence of spirochetes to keep driving a robust immune response while evading host defenses; this duality is best exemplified during the florid, disseminated stage called secondary syphilis (SS)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29051224/advanced-glycation-end-products-impair-nlrp3-inflammasome-mediated-innate-immune-responses-in-macrophages
#3
Seunghwan Son, Inhwa Hwang, Seung Hyeok Han, Jeon-Soo Shin, Ok Sarah Shin, Je-Wook Yu
Advanced glycation end products (AGEs) are adducts formed on proteins by glycation with reducing sugars, such as glucose, and tend to form and accumulate under hyperglycemic conditions. AGE accumulation alters protein function and has been implicated in the pathogenesis of many degenerative diseases such as diabetic complications. AGEs have also been shown to promote the production of pro-inflammatory cytokines, but the roles of AGEs in inflammasome signaling have not been explored in detail. Here, we present evidence that AGEs attenuate activation of the NLRP3 inflammasome in bone marrow-derived macrophages (BMDMs) as determined by caspase-1 processing and interleukin-1β production...
October 19, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29047090/metabolic-reprogramming-and-redox-signaling-in-pulmonary-hypertension
#4
Lydie Plecitá-Hlavatá, Angelo D'alessandro, Karim El Kasmi, Min Li, Hui Zhang, Petr Ježek, Kurt R Stenmark
Pulmonary hypertension is a complex disease of the pulmonary vasculature, which in severe cases terminates in right heart failure. Complex remodeling of pulmonary arteries comprises the central issue of its pathology. This includes extensive proliferation, apoptotic resistance and inflammation. As such, the molecular and cellular features of pulmonary hypertension resemble hallmark characteristics of cancer cell behavior. The vascular remodeling derives from significant metabolic changes in resident cells, which we describe in detail...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29044999/macrophage-subpopulations-and-their-impact-on-chronic-allograft-rejection-versus-graft-acceptance-in-a-mouse-heart-transplant-model
#5
Yue Zhao, Song Chen, Peixiang Lan, Chenglin Wu, Yaling Dou, Xiang Xiao, Zhiqiang Zhang, Laurie Minze, Xiaoshun He, Wenhao Chen, Xian C Li
Macrophages infiltrating the allografts are heterogeneous, consisting of pro-inflammatory (M1 cells) as well as anti-inflammatory and fibrogenic phenotypes (M2 cells); they affect transplant outcomes via diverse mechanisms. Herein, we found that macrophage polarization into M1 and M2 subsets was critically dependent on TRAF6 and mTOR, respectively. In a heart transplant model we showed that macrophage-specific deletion of TRAF6 (LysM(C)(re) Traf6(fl/fl) ) or mTOR (LysM(C)(re) Mtor(fl/fl) ) did not affect acute allograft rejection...
October 17, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/29044201/macrophage-polarization-and-function-new-prospects-for-fibrotic-disease
#6
REVIEW
Dexi Zhou, Kui Yang, Lu Chen, Yaqin Wang, Wen Zhang, Zhenyu Xu, Jian Zuo, Hui Jiang, Jiajie Luan
Fibrosis is commonly regarded as a pathological and dynamic process with the hallmarks of chronic inflammation and wound healing. Emerging evidence indicates that heterogeneous monocyte-macrophage lineage cells are indispensable for mounting either pro-fibrotic or anti-fibrotic responses in different stages during fibrotic pathogenesis. This review highlights the evolving roles of macrophage polarization and functions linked to fibrosis in multiple organs. In the future, identifying the molecular and cellular factors that influence the macrophage phenotypic balance may provide novel therapeutic approaches for fibrotic diseases...
August 14, 2017: Immunology and Cell Biology
https://www.readbyqxmd.com/read/29042581/immunoproteasome-subunit-%C3%A3-5i-lmp7-deficiency-in-atherosclerosis
#7
Bernd Hewing, Antje Ludwig, Cristian Dan, Max Pötzsch, Carmen Hannemann, Andreas Petry, Dilyara Lauer, Agnes Görlach, Elena Kaschina, Dominik N Müller, Gert Baumann, Verena Stangl, Karl Stangl, Nicola Wilck
Management of protein homeostasis by the ubiquitin-proteasome system is critical for atherosclerosis development. Recent studies showed controversial results on the role of immunoproteasome (IP) subunit β5i/LMP7 in maintenance of protein homeostasis under cytokine induced oxidative stress. The present study aimed to investigate the effect of β5i/LMP7-deficiency on the initiation and progression of atherosclerosis as a chronic inflammatory, immune cell driven disease. LDLR(-/-)LMP7(-/-) and LDLR(-/-) mice were fed a Western-type diet for either 6 or 24 weeks to induce early and advanced stage atherosclerosis, respectively...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29042292/obesity-enhances-carcinogen-7-12-dimethylbenz-a-anthracene-induced-tumorigenesis-in-vitro-and-in-vivo
#8
Chia-Chien Hsieh, Shih-Han Peng, Mei-Jia Chou
Growing body of evidence shows that extra adiposity influences on the progression of multiple cancers, including breast cancer. The aim of this study is to investigate whether obesity correlates with mammary tumor development in vitro and in vivo. We found that obesity-related mediators, 3T3-L1 adipocyte conditioned medium, enhanced formation of cancerous foci induced by the carcinogen 7,12-Dimethylbenz[a]anthracene (DMBA) in NIH/3T3 fibroblasts, in vitro. Additionally, we tested the effect of obesity in mouse model of DMBA-induced breast cancer...
October 14, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29040966/natural-product-celastrol-suppressed-macrophage-m1-polarization-against-inflammation-in-diet-induced-obese-mice-via-regulating-nrf2-ho-1-map-kinase-and-nf-%C3%AE%C2%BAb-pathways
#9
Dan Luo, Yumeng Guo, Yuanyuan Cheng, Jia Zhao, Yu Wang, Jianhui Rong
Macrophage polarization is implicated in the inflammation in obesity. The aim of the present study was to examine the anti-inflammatory activities of botanical triterpene celastrol against diet-induced obesity. We treated diet-induced obese C57BL/6N male mice with celastrol (5, 7.5 mg/kg/d) for 3 weeks, and investigated macrophage M1/M2 polarization in adipose and hepatic tissues. Celastrol reduced fat accumulation and ameliorated glucose tolerance and insulin sensitivity. Celastrol down-regulated the mRNA levels of macrophage M1 biomarkers (e...
October 16, 2017: Aging
https://www.readbyqxmd.com/read/29038604/overexpression-of-osm-and-il-6-impacts-the-polarization-of-pro-fibrotic-macrophages-and-the-development-of-bleomycin-induced-lung-fibrosis
#10
Ehab A Ayaub, Anisha Dubey, Jewel Imani, Fernando Botelho, Martin R J Kolb, Carl D Richards, Kjetil Ask
Although recent evidence indicates that gp130 cytokines, Oncostatin M (OSM) and IL-6 are involved in alternative programming of macrophages, their role in lung fibrogenesis is poorly understood. Here, we investigated the effect of transient adenoviral overexpression of OSM or IL-6 in mice during bleomycin-induced lung fibrosis. Lung fibrosis and M2-like macrophage accumulation were assessed by immunohistochemistry, western blotting, gene expression and flow cytometry. Ex-vivo isolated alveolar and bone marrow-derived macrophages were examined for M2-like programming and signalling...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29038174/tumor-associated-macrophages-tams-depend-on-zeb1-for-their-cancer-promoting-roles
#11
Marlies Cortés, Lidia Sanchez-Moral, Oriol de Barrios, María J Fernández-Aceñero, M C Martínez-Campanario, Anna Esteve-Codina, Douglas S Darling, Balázs Győrffy, Toby Lawrence, Douglas C Dean, Antonio Postigo
Accumulation of tumor-associated macrophages (TAMs) associates with malignant progression in cancer. However, the mechanisms that drive the pro-tumor functions of TAMs are not fully understood. ZEB1 is best known for driving an epithelial-to-mesenchymal transition (EMT) in cancer cells to promote tumor progression. However, a role for ZEB1 in macrophages and TAMs has not been studied. Here we describe that TAMs require ZEB1 for their tumor-promoting and chemotherapy resistance functions in a mouse model of ovarian cancer...
October 16, 2017: EMBO Journal
https://www.readbyqxmd.com/read/29037504/an-investigation-of-virulence-factors-of-legionella-pneumophila-environmental-isolates
#12
Elif Özlem Arslan-Aydoğdu, Ayten Kimiran
Nine Legionella pneumophila strains isolated from cooling towers and a standard strain (L. pneumophila serogroup 1, ATCC 33152, Philadelphia 1) were analyzed and compared in terms of motility, flagella structure, ability to form biofilms, enzymatic activities (hemolysin, nucleases, protease, phospholipase A, phospholipase C, acid phosphatase, alkaline phosphatase and lipase), hemagglutination capabilities, and pathogenicity in various host cells (Acanthamoeba castellanii ATCC 30234, mouse peritoneal macrophages and human peripheral monocytes)...
July 22, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/29036959/-the-study-of-liver-macrophages-polarization-in-patients-with-autoimmune-hepatitis
#13
L P Guo, L Zhou, H X Li, J Zhang, B M Wang
To explore the functional phenotype of liver macrophages in patients with autoimmune hepatitis (AIH). Compared with patients with nonalcoholic fatty liver disease (NAFLD) and chronic hepatitis B (CHB), the absolute CD(68)(+) cell count in patients with AIH was significantly higher (all P<0.05). It was positively correlated with ALT and IgG levels (the correlation coefficients 0.600 and 0.700, P=0.285 and 0.188 respectively). Additionally, compared with patients with NAFLD, the absolute iNOS positive cell count in patients with AIH and CHB were significantly higher (all P<0...
October 1, 2017: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
https://www.readbyqxmd.com/read/29036651/aureobasidium-pullulans-cultured-fluid-induces-il-18-production-leading-to-th1-polarization-during-influenza-a-virus-infection
#14
Daisuke Fujikura, Daisuke Muramatsu, Kochi Toyomane, Satoko Chiba, Takuji Daito, Atsushi Iwai, Takahisa Kouwaki, Masaaki Okamoto, Hideaki Higashi, Hiroshi Kida, Hiroyuki Oshiumi
Several microbial molecules with pathogen-associated molecular patterns stimulate host innate immune responses. The innate immune system plays a crucial role in activating acquired immune response via cytokine production and antigen presentation. Previous studies have shown that Aureobasidium pullulans-cultured fluid (AP-CF), which contains β-glucan, exhibits adjuvant activity and renders mice resistance to influenza A virus infection; however, the underlying mechanism remains elusive. In this study, we investigated the innate immune response to AP-CF...
October 3, 2017: Journal of Biochemistry
https://www.readbyqxmd.com/read/29036027/early-macrophage-infiltration-improves-the-fat-graft-survival-by-inducing-angiogenesis-and-hematopoietic-stem-cell-recruitment
#15
Junrong Cai, Jingwei Feng, Kaiyang Liu, Shaolong Zhou, Feng Lu
BACKGROUND: Fat grafting is a popular soft tissue filler method; however, its results are variable and technique-dependent. Macrophages are present in fat grafts and closely associated with tissue regeneration. We hypothesized that activation/depletion of early macrophages in transferred fat improves/impairs fat graft survival. METHODS: Mouse inguinal fat (~150 mg) was transferred autologously. Fat grafting was first performed without other manipulations to obtain baseline information...
October 12, 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/29033946/exploitation-of-scavenger-receptor-macrophage-receptor-with-collagenous-structure-by-cryptococcus-neoformans-promotes-alternative-activation-of-pulmonary-lymph-node-cd11b-conventional-dendritic-cells-and-non-protective-th2-bias
#16
Jintao Xu, Adam Flaczyk, Lori M Neal, Zhenzong Fa, Daphne Cheng, Mike Ivey, Bethany B Moore, Jeffrey L Curtis, John J Osterholzer, Michal A Olszewski
Macrophage receptor with collagenous structure (MARCO) contributes to fungal containment during the early/innate phase of cryptococcal infection; however, its role in adaptive antifungal immunity remains unknown. Using a murine model of cryptococcosis, we compared host adaptive immune responses in wild-type and MARCO(-/-) mice throughout an extended time course post-infection. Unlike in early infection, MARCO deficiency resulted in improved pulmonary fungal clearance and diminished cryptococcal dissemination during the efferent phase...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29033935/cannabinoid-receptor-1-participates-in-liver-inflammation-by-promoting-m1-macrophage-polarization-via-rhoa-nf-%C3%AE%C2%BAb-p65-and-erk1-2-pathways-respectively-in-mouse-liver-fibrogenesis
#17
Lei Tian, Weiyang Li, Le Yang, Na Chang, Xiaoting Fan, Xiaofang Ji, Jieshi Xie, Lin Yang, Liying Li
Macrophage M1/M2 polarization mediates tissue damage and inflammatory responses. Cannabinoid receptor (CB) 1 participated in liver fibrogenesis by affecting bone marrow (BM)-derived monocytes/macrophages (BMMs) activation. However, the knowledge of whether CB1 is involved in the polarization of BMMs remains limited. Here, we found M1 gene signatures (including CD86, MIP-1β, tumor necrosis factor, IL-6, and inducible nitric oxide synthase) and the amount of M1 macrophages (CD86(+) cells, gated by F4/80) were significantly elevated in carbon tetrachloride (CCl4)-induced mouse injured livers, while that of M2 type macrophages had little change by RT-qPCR and fluorescence-activated cell sorting (FACS)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29033930/immunomodulatory-effects-of-calcium-and-strontium-co-doped-titanium-oxides-on-osteogenesis
#18
Xiangwei Yuan, Huiliang Cao, Jiaxing Wang, Kaiwei Tang, Bin Li, Yaochao Zhao, Mengqi Cheng, Hui Qin, Xuanyong Liu, Xianlong Zhang
The effects of calcium (Ca) or strontium (Sr) on host osteogenesis and immune responses have been investigated separately. In clinical practice, these two elements may both be present around an orthopedic device, but their potential synergistic effects on osteogenesis and the immune response have not been explored to date. In this work, we investigated the immunomodulatory effects of Ca and Sr co-doped titanium oxides on osteogenesis in vitro using the mouse macrophage cell line RAW 264.7 alone and in co-culture with mouse bone mesenchymal stem cells (BMSCs), and in vivo using a mouse air-pouch model...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29032836/the-impact-of-interferon-regulatory-factors-to-macrophage-differentiation-and-polarization-into-m1-and-m2
#19
REVIEW
Dimitry A Chistiakov, Veronika A Myasoedova, Victor V Revin, Alexander N Orekhov, Yuri V Bobryshev
The mononuclear phagocytes control the body homeostasis through the involvement in resolving tissue injury and further wound healing. Indeed, local tissue microenvironmental changes can significantly influence the functional behavior of monocytes and macrophages. Such microenvironmental changes for example occur in an atherosclerotic plaque during all progression stages. In response to exogenous stimuli, macrophages show a great phenotypic plasticity and heterogeneity. Exposure of monocytes to inflammatory or anti-inflammatory conditions also induces predominant differentiation to proinflammatory (M1) or anti-inflammatory (M2) macrophage subsets and phenotype switch between macrophage subsets...
October 5, 2017: Immunobiology
https://www.readbyqxmd.com/read/29031765/an-increased-autophagic-flux-contributes-to-the-anti-inflammatory-potential-of-urolithin-a-in-macrophages
#20
Yaw Duah Boakye, Laura Groyer, Elke H Heiss
BACKGROUND: An extract of Phyllanthus muellerianus and its constituent geraniin have been reported to exert anti-inflammatory activity in vivo. However, orally consumed geraniin, an ellagitannin, shows low bioavailability and undergoes metabolization to urolithins by gut microbiota. This study aimed at comparing geraniin and urolithin A with respect to inhibition of M1 (LPS) polarization of murine J774.1 macrophages and shedding more light on possible underlying mechanisms. METHODS: Photometric, fluorimetric as well as luminescence-based assays monitored production of reactive oxygen species (ROS) and nitric oxide (NO), cell viability or reporter gene expression...
October 11, 2017: Biochimica et Biophysica Acta
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