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M1 polarization

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https://www.readbyqxmd.com/read/29791797/modulating-macrophage-polarization-through-ccr2-inhibition-and-multivalent-engagement
#1
Michael B Deci, Scott W Ferguson, Sydney L Scatigno, Juliane Nguyen
Excessive or prolonged recruitment of inflammatory monocytes to damaged tissue can significantly worsen patient outcomes. Monocytes migrate to sites of tissue inflammation in response to high local concentrations of CCL2, a chemokine that binds to and signals through the CCR2 receptor. While the role of CCR2 in cellular migration is well studied, it is unclear how CCR2 inhibition affects macrophage polarization and if multivalency can increase downstream signaling effects. Using affinity selection with a phage library, we identified a novel scFv (58C) that binds specifically and with high affinity to the N-terminal domain of CCR2 (KD = 59...
May 23, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29790836/minocycline-promotes-post-hemorrhagic-neurogenesis-via-m2-microglia-polarization-via-up-regulation-of-the-trkb-bdnf-pathway-in-rats
#2
Miao Hongsheng, Runming Li, Cong Han, Xiuzhen Lu, Hang Zhang
Intracerebral hemorrhage (ICH) is a devastating disease worldwide with increasing mortality. The present study investigated whether minocycline was neuroprotective and induced M2 microglial polarization via up-regulation of the TrkB/BDNF pathway after ICH. ICH was induced via injection of autologous blood into 150 Sprague-Dawley (S-D) rats. A selective TrkB antagonist (ANA 12) and agonist (HIOC) were used to investigate the mechanism of minocycline-induced neuroprotection. Minocycline improved ICH-induced neurological deficits and reduced M1 microglia marker protein (CD68, CD16) expression as well as M2 microglial polarization (CD206 and arginase 1 protein)...
May 23, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29790247/the-promotion-of-tissue-engineering-blood-vessel-patency-by-cgs21680-through-regulating-pro-inflammatory-activities-of-endothelial-progenitor-cell
#3
Wen Chen, Li Xiao, Jian Bai, Wen Zeng, Mingcan Yang, Bingyi Shi, Chuhong Zhu
The mobilization and homing of endothelial progenitor cells (EPCs) contribute to the rapid endothelialization of tissue engineering blood vessel (TEBV). Inflammation can affect TEBV patency, and monocytes/macrophages (MM) are the main effector cells. But it is not clear how EPCs interact with MM after TEBV transplantation. Our results showed acellular materials would not directly cause acute and severe inflammatory responses but activate E-selectin expression in homing EPCs, gradually promoting the polarization of MM to the M1...
May 23, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29788960/ecto-5-nucleotidase-cd73-attenuates-inflammation-after-spinal-cord-injury-by-promoting-macrophages-microglia-m2-polarization-in-mice
#4
Shun Xu, Wei Zhu, Minghao Shao, Fan Zhang, Ji Guo, Haocheng Xu, Jianyuan Jiang, Xiaosheng Ma, Xinlei Xia, Xiuling Zhi, Ping Zhou, Feizhou Lu
BACKGROUND: Immune activation, specifically activation of macrophages and resident microglia, leading to inflammation is a key component in the progression of spinal cord injury (SCI). Macrophages/microglia exist in two states-the classically activated M1 phenotype that confers pro-inflammatory effects or the alternatively activated M2 phenotype that confers anti-inflammatory effects. Ecto-5'-nucleotidase (CD73) is an immunosuppressive molecule intricately involved in adaptive and innate immune responses and is able to dephosphorylate AMP to adenosine...
May 22, 2018: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/29788098/helicobacter-pylori-colonization-protects-against-chronic-experimental-colitis-by-regulating-th17-treg-balance
#5
Hongchen Zhang, Yun Dai, Yun Liu, Ting Wu, Jing Li, Xiaolei Wang, Weihong Wang
Background: Epidemiological studies have demonstrated an inverse association between Helicobacter pylori infection and the risk of developing inflammatory bowel disease (IBD). The mechanisms by which H. pylori infection protects against IBD are unclear. Here, we explored the possible protective effects and mechanisms of gastric H. pylori colonization on a chronic colitis model, with focus on whether H. pylori exerted its effects through regulating Th17/Treg immune responses. Methods: Chronic colitis was induced by dextran sulfate sodium (DSS) treatment...
May 17, 2018: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/29787429/first-insights-into-the-m2-inflammatory-response-after-adipose-tissue-derived-stem-cell-injections-in-radiation-injured-muscles
#6
Diane Riccobono, Krisztina Nikovics, Sabine François, Anne-Laure Favier, Nicolas Jullien, Gerrit Schrock, Harry Scherthan, Michel Drouet
The cutaneous radiation syndrome is the clinical consequence of local high-dose irradiation. It is characterized by extensive inflammation, necrosis, and poor revascularization of the skin, resulting in muscle inflammation and fibrosis. Based on these physiopathological processes, subcutaneous injections of adipose-tissue-derived stem/stromal cells have shown favorable effects on skin-wound healing in a minipig model of cutaneous radiation syndrome, in which muscle fibrosis persisted. Since fibrosis is mainly due to the inflammatory processes that often affect underlying tissues as well, the beneficial effects of intramuscular injections of adipose-tissue-derived stem/stromal cells on tissue recovery were evaluated...
July 2018: Health Physics
https://www.readbyqxmd.com/read/29781148/improved-osteogenesis-of-boron-incorporated-calcium-silicate-coatings-via-immunomodulatory-effects
#7
Xiang Lu, Kai Li, Youtao Xie, Shengcai Qi, Qingyi Shen, Jiangming Yu, Liping Huang, Xuebin Zheng
Osteoimmunology has revealed the importance of a favorable immune response for successful biomaterial-mediated osteogenesis. Boron-incorporated calcium silicate (Ca11 Si4 B2 O22 , B-CS) coating has been reported as a potential candidate for improving osteogenesis in orthopedic applications in vitro. However, relatively little is known about its effects on the immune response and subsequent osteogenesis. In this work, the immunomodulatory properties of the B-CS coating and its specific mechanism of action were explored...
May 20, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29777767/biglycan-is-a-new-high-affinity-ligand-for-cd14-in-macrophages
#8
Heiko Roedig, Madalina V Nastase, Helena Frey, Kristin Moreth, Jinyang Zeng-Brouwers, Chiara Poluzzi, Louise Tzung-Harn Hsieh, Christian Brandts, Simone Fulda, Malgorzata Wygrecka, Liliana Schaefer
Sterile inflammation is a therapeutic target in many diseases where it represents an important initiator of disease progression. However, the detailed mechanisms underlying its evolution and biological relevance are not yet completely elucidated. Biglycan, a prototype extracellular matrix-derived damage-associated molecular pattern, mediates sterile inflammation in macrophages through Toll-like receptor (TLR) 2 and/or TLR4-dependent signaling pathways. Here we discovered that soluble biglycan is a novel high-affinity ligand for CD14, a well-known GPI-anchored co-receptor for TLRs...
May 16, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29776615/a-new-and-efficient-culture-method-for-porcine-bone-marrow-derived-m1-and-m2-polarized-macrophages
#9
Jiye Gao, Maaike R Scheenstra, Albert van Dijk, Edwin J A Veldhuizen, Henk P Haagsman
BACKGROUND: Macrophages play an important role in the innate immune system as part of the mononuclear phagocyte system (MPS). They have a pro-inflammatory signature (M1-polarized macrophages) or anti-inflammatory signature (M2-polarized macrophages) based on expression of surface receptors and secretion of cytokines. However, very little is known about the culture of macrophages from pigs and more specific about the M1 and M2 polarization in vitro. METHODS: Porcine monocytes or mononuclear bone marrow cells were used to culture M1- and M2-polarized macrophages in the presence of GM-CSF and M-CSF, respectively...
June 2018: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/29776446/valproic-acid-attenuates-traumatic-spinal-cord-injury-induced-inflammation-via-stat1-and-nf-%C3%AE%C2%BAb-pathway-dependent-of-hdac3
#10
Shoubo Chen, Jingfang Ye, Xiangrong Chen, Jinnan Shi, Wenhua Wu, Wenping Lin, Weibin Lin, Yasong Li, Huangde Fu, Shun Li
BACKGROUND: Microglial polarization with M1/M2 phenotype shifts and the subsequent neuroinflammatory responses are vital contributing factors for spinal cord injury (SCI)-induced secondary injury. Nuclear factor-κB (NF-κB) is considered the central transcription factor of inflammatory mediators, which plays a crucial role in microglial activation. Lysine acetylation of STAT1 seems necessary for NF-kB pathway activity, as it is regulated by histone deacetylases (HDACs). There have been no studies that have explained if HDAC inhibition by valproic acid (VPA) affects the NF-κB pathway via acetylation of STAT1 dependent of HDAC activity in the microglia-mediated central inflammation following SCI...
May 18, 2018: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/29775390/polarization-and-distribution-of-tumor-associated-macrophages-and-cox-2-expression-in-basal-cell-carcinoma-of-the-ocular-adnexae
#11
Ute Kaiser, Karin U Loeffler, Jennifer Nadal, Frank G Holz, Martina C Herwig-Carl
PURPOSE: Basal cell carcinoma (BCC) is a locally invasive skin tumor which can be subdivided into a circumscribed nodular and an invasive fibrosing subtype. There is increasing evidence that macrophages play an important role in interacting between tumor cells and their microenvironment, thereby affecting not only the invasive potential but also the patients' prognosis. Thus, we wanted to compare these two BCC variants with regard to tumor-related inflammation, COX-2 expression, distribution and polarization of tumor-associated macrophages...
May 18, 2018: Current Eye Research
https://www.readbyqxmd.com/read/29775050/modulation-of-macrophage-phenotype-by-biodegradable-polyurethane-nanoparticles-the-possible-relation-between-macrophage-polarization-and-immune-response-of-nanoparticles
#12
Yen-Jang Huang, Kun-Che Hung, Huey-Shan Hung, Shan-Hui Hsu
Nanomaterials with surface functionalized by different chemical groups can either provoke or attenuate the immune responses of the nanomaterials, which is critical to their biomedical efficacies. In this study we demonstrate that synthetic waterborne polyurethane nanoparticles (PU NPs) can inhibit the macrophage polarization towards the M1 phenotype, but not M2 phenotype. The surface-functionalized PU NPs decrease the secretion levels of proinflammatory cytokines (TNF-α and IL-1β) for M1 macrophages. Specifically, PU NPs with carboxyl groups on the surface exhibit a greater extent of inhibition on M1 polarization than those with amine groups...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29773671/targeted-inhibition-of-cd74-attenuates-adipose-cox-2-mif-mediated-m1-macrophage-polarization-and-retards-obesity-related-adipose-tissue-inflammation-and-insulin-resistance
#13
Pei-Chi Chan, Ting-Ni Wu, Ying-Chuan Chen, Chieh-Hua Lu, Martin Wabitsch, Yu-Feng Tian, Po-Shiuan Hsieh
Adipose tissue (AT) inflammation is crucial to the development of obesity-associated insulin resistance. Our aim was to investigate the contribution of COX-2/MIF-mediated crosstalk between hypertrophic adipocytes and macrophages to the etiology of AT inflammation and involvement of CD74 using human SGBS adipocytes, THP-1 macrophages and mice fed a high-fat (HF) diet. The MIF and CD74 mRNA levels in the adipocytes and SVCs (stromal vascular cells) of white fat were highly correlated with body weight, HOMA-IR and adipose macrophage marker expression levels, especially those in SVCs...
May 17, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29771935/cell-iron-status-influences-macrophage-polarization
#14
Rafiou Agoro, Meriem Taleb, Valerie F J Quesniaux, Catherine Mura
Macrophages play crucial roles in innate immune response and in the priming of adaptive immunity, and are characterized by their phenotypic heterogeneity and plasticity. Reprogramming intracellular metabolism in response to microenvironmental signals is required for M1/M2 macrophage polarization and function. Here we assessed the influence of iron on the polarization of the immune response in vivo and in vitro. Iron-enriched diet increased M2 marker Arg1 and Ym1 expression in liver and peritoneal macrophages, while iron deficiency decreased Arg1 expression...
2018: PloS One
https://www.readbyqxmd.com/read/29770147/koumine-attenuates-neuroglia-activation-and-inflammatory-response-to-neuropathic-pain
#15
Gui-Lin Jin, Sai-Di He, Shao-Mei Lin, Li-Mian Hong, Wan-Qing Chen, Ying Xu, Jian Yang, Su-Ping Li, Chang-Xi Yu
Despite decades of studies, the currently available drugs largely fail to control neuropathic pain. Koumine-an alkaloidal constituent derived from the medicinal plant Gelsemium elegans Benth.-has been shown to possess analgesic and anti-inflammatory properties; however, the underlying mechanisms remain unclear. In this study, we aimed to investigate the analgesic and anti-inflammatory effects and the possible underlying mechanisms of koumine. The analgesic and anti-inflammatory effects of koumine were explored by using chronic constriction injury of the sciatic nerve (CCI) neuropathic pain model in vivo and LPS-induced injury in microglia BV2 cells in vitro ...
2018: Neural Plasticity
https://www.readbyqxmd.com/read/29770139/spermine-alleviates-acute-liver-injury-by-inhibiting-liver-resident-macrophage-pro-inflammatory-response-through-atg5-dependent-autophagy
#16
Shun Zhou, Jian Gu, Rui Liu, Song Wei, Qi Wang, Hongbing Shen, Yifan Dai, Haoming Zhou, Feng Zhang, Ling Lu
Liver-resident macrophages (Kupffer cells, KCs) and autophagy play critical roles in the pathogenesis of toxin-induced liver injury. Recent evidence indicates that autophagy can regulate macrophage M1/M2 polarization under different inflammatory conditions. Polyamines, including putrescine, spermidine, and spermine (SPM), are polycations with anti-oxidative, anti-aging, and cell autophagy induction properties. This study aimed to determine the mechanisms by which SPM protects against thioacetamide (TAA)-induced acute liver injury in a mouse model...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29767957/magnetic-manipulation-of-reversible-nanocaging-controls-in-vivo-adhesion-and-polarization-of-macrophages
#17
Heemin Kang, Hee Joon Jung, Sung Kyu Kim, Dexter Siu Hong Wong, Sien Lin, Gang Li, Vinayak P Dravid, Liming Bian
Macrophages are key immune cells that perform various physiological functions, such as the maintenance of homeostasis, host defense, disease progression, and tissue regeneration. Macrophages adopt distinctly polarized phenotypes, such as pro-inflammatory M1 phenotype or anti-inflammatory (pro-healing) M2 phenotype, to execute disparate functions. The remotely controlled reversible uncaging of bioactive ligands, such as Arg-Gly-Asp (RGD) peptide, is an appealing approach for temporally regulating the adhesion and resultant polarization of macrophages on the implants in vivo...
May 16, 2018: ACS Nano
https://www.readbyqxmd.com/read/29765169/m1-m2-macrophage-polarization-in-human-obese-adipose-tissue
#18
Jaroslava Chylikova, Jana Dvorackova, Zdenek Tauber, Vojtech Kamarad
Obesity and insulin resistance are closely associated with chronic inflammation in adipose tissue, where macrophages play an important role. Adipose tissue macrophages can be divided into two main phenotypes: the classical M1 macrophages and alternatively activated macrophages M2. M1 macrophages produce pro-inflammatory cytokines (TNF-α, interleukin IL-6 and MCP-1) and thus contribute to the development of insulin resistance. On the other hand, M2 macrophages, anti-inflammatory, are involved in the maintenance of tissue homeostasis and are typical in the adipose tissue of slender individuals...
May 16, 2018: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/29763636/inhibition-of-cox-2-mpges-1-and-5-lox-in-macrophages-by-leonurine-ameliorates-monosodium-urate-crystal-induced-inflammation
#19
Yanzhuo Liu, Chenfan Duan, Honglei Chen, Chenlong Wang, Xiaoxiao Liu, Miao Qiu, Honglin Tang, Feng Zhang, Xiaoyang Zhou, Jing Yang
Cyclooxygenase-2 (COX-2), 5-lipoxygenase (5-LOX) and microsomal prostaglandin E synthase-1 (mPGES-1)-derived eicosanoids play an essential role in human inflammatory disorders. Here, we investigated whether inhibition of COX-2/mPGES-1 and 5-LOX in macrophages by leonurine ameliorates monosodium urate (MSU) crystal-induced inflammation. Virtual screening assay and in vitro enzyme inhibition assay showed that leonurine was a potential inhibitor of COX-2, mPGES-1 and 5-LOX. Compared with COX-2 inhibitor celecoxib, leonurine (30 mg/kg) significantly decreased ankle perimeter, gait score and neutrophil number in synovial fluid in MSU crystal-treated rats, accompanied with the decreased expression of COX-2, mPGES-1 and 5-LOX and production of prostaglandin E2 (PGE2 ) and leukotriene B4 (LTB4 ) in the synovial fluid macrophages...
May 15, 2018: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29763604/attenuation-of-macrophage-accumulation-and-polarisation-in-obese-diabetic-mice-by-a-small-molecule-significantly-improved-insulin-sensitivity
#20
Sandip Mukherjee, Snehasis Das, Dipanjan Chattopadhyay, Shuvasree Sarkar, Subhendu Kumar Chatterjee, Dhrubajyoti Talukdar, Sutapa Mukherjee, Subeer S Majumder, Satinath Mukhopadhyay, Mihir K Chaudhuri, Samir Bhattacharya
Accumulation and polarization of anti-inflammatory M2 to proinflammatory M1 macrophage in the adipose tissue of obese diabetic mice is an important pathogenic signature. It worsens lipid induced inflammation and insulin resistance. Here we demonstrate that a small molecule, a peroxyvanadate compound i.e. DmpzH [VO(O2 )2 (dmpz)] or dmp, could robustly decrease macrophage infiltration, accumulation and their polarization in high fat diet (HFD) induced obese diabetic mice. In searching the underlying mechanism it was revealed that SIRT1 level was strikingly low in the inflamed adipose tissue of HFD mice as compared to mice fed with standard diet (SD)...
May 12, 2018: Biochemical and Biophysical Research Communications
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