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M2 Macrophage

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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/29788960/ecto-5-nucleotidase-cd73-attenuates-inflammation-after-spinal-cord-injury-by-promoting-macrophages-microglia-m2-polarization-in-mice
#2
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
#3
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
#4
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/29783929/modulation-the-crosstalk-between-tumor-associated-macrophages-and-non-small-cell-lung-cancer-to-inhibit-tumor-migration-and-invasion-by-ginsenoside-rh2
#5
Honglin Li, Nan Huang, Weikang Zhu, Jianchun Wu, Xiaohui Yang, Wenjing Teng, Jianhui Tian, Zhihong Fang, Yingbin Luo, Min Chen, Yan Li
BACKGROUND: Tumor-associated macrophages (TAMs) play a critical role in modulating the tumor microenvironment and promote tumor metastases. Our studies have demonstrated that ginsenoside Rh2 (G-Rh2), a monomeric compound extracted from ginseng, is a promising anti-tumor agent in lung cancer cells. However, it remains unclear whetherG-Rh2 can modulate the differentiation of TAMs and its interaction with tumor microenvironment. In this study, we investigated how G-Rh2 regulates the phenotype of macrophages and affects the migration of non-small cell lung cancer (NSCLC) cells...
May 22, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29782549/sphingosine-1-phosphate-receptor-2-facilitates-pulmonary-fibrosis-through-potentiating-il-13-pathway-in-macrophages
#6
Juanjuan Zhao, Yasuo Okamoto, Yuya Asano, Kazuhiro Ishimaru, Sho Aki, Kazuaki Yoshioka, Noriko Takuwa, Takashi Wada, Yutaka Inagaki, Chiaki Takahashi, Takumi Nishiuchi, Yoh Takuwa
Idiopathic pulmonary fibrosis is a devastating disease with poor prognosis. The pathogenic role of the lysophospholipid mediator sphingosine-1-phosphate and its receptor S1PR2 in lung fibrosis is unknown. We show here that genetic deletion of S1pr2 strikingly attenuated lung fibrosis induced by repeated injections of bleomycin in mice. We observed by using S1pr2LacZ/+ mice that S1PR2 was expressed in alveolar macrophages, vascular endothelial cells and alveolar epithelial cells in the lung and that S1PR2-expressing cells accumulated in the fibrotic legions...
2018: PloS One
https://www.readbyqxmd.com/read/29781181/effects-of-phosphatidylserine-containing-supported-lipid-bilayers-on-the-polarization-of-macrophages
#7
Hongxuan Quan, Yongjoon Kim, Hee Chul Park, Hyeong-Cheol Yang
Placement of dental implants initiates inflammatory foreign body response, in which macrophages play a central role and affect the subsequent tissue healing process such as bone formation. The purpose of this study was to fabricate phosphatidylserine (PS)-containing supported lipid bilayers (SLBs) on a titanium surface to regulate the polarization of macrophages, a critical factor that affects following tissue healing and regeneration. The fluorescent recovery after photobleaching (FRAP) images showed that the percentage of PS had a critical influence on the fluidity, and 20% PS had the highest fluidity...
May 20, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29781148/improved-osteogenesis-of-boron-incorporated-calcium-silicate-coatings-via-immunomodulatory-effects
#8
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/29780382/extracellular-purine-metabolism-is-the-switchboard-of-immunosuppressive-macrophages-and-a-novel-target-to-treat-diseases-with-macrophage-imbalances
#9
Anna Ohradanova-Repic, Christian Machacek, Celine Charvet, Franck Lager, Delphine Le Roux, René Platzer, Vladimir Leksa, Goran Mitulovic, Thomas R Burkard, Gerhard J Zlabinger, Michael B Fischer, Vincent Feuillet, Gilles Renault, Stephan Blüml, Miroslav Benko, Miloslav Suchanek, Johannes B Huppa, Takami Matsuyama, Artur Cavaco-Paulo, Georges Bismuth, Hannes Stockinger
If misregulated, macrophage (Mϕ)-T cell interactions can drive chronic inflammation thereby causing diseases, such as rheumatoid arthritis (RA). We report that in a proinflammatory environment, granulocyte-Mϕ (GM-CSF)- and Mϕ colony-stimulating factor (M-CSF)-dependent Mϕs have dichotomous effects on T cell activity. While GM-CSF-dependent Mϕs show a highly stimulatory activity typical for M1 Mϕs, M-CSF-dependent Mϕs, marked by folate receptor β (FRβ), adopt an immunosuppressive M2 phenotype. We find the latter to be caused by the purinergic pathway that directs release of extracellular ATP and its conversion to immunosuppressive adenosine by co-expressed CD39 and CD73...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29779100/the-influence-of-myofibrils-on-the-proliferation-and-differentiation-of-myoblasts-cocultured-with-macrophages
#10
I V Kravchenko, V A Furalev, V O Popov
We studied the effect of myofibrils on proliferation and differentiation of myoblasts cocultured with macrophages as well as the effect of incubation of macrophages with myofibrils on the expression by macrophages of the compounds that are cytokines for muscle cells. In the cocultures, macrophages stimulated the proliferation of myoblasts. Myofibrils greatly enhanced the stimulating effect of macrophages, whereas lipopolysaccharide (LPS) completely abolished it. The culture medium conditioned by macrophages activated the proliferation of myoblasts that were incubated with myofibrils but inhibited it when myoblasts were incubated with LPS...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29778740/alpha-1-antitrypsin-ameliorates-inflammation-and-neurodegeneration-in-the-diabetic-mouse-retina
#11
Gustavo Ortiz, Emiliano S Lopez, Juan P Salica, Constanza Potilinski, Mariano Fernández Acquier, Eduardo Chuluyan, Juan E Gallo
Diabetic retinopathy (DR) is the most common cause of blindness in the working age population. Early events of DR are accompanied by neurodegeneration of the inner retina resulting in ganglion cell loss. These findings together with reduced retinal thickness are observed within the first weeks of experimental DR. Besides, an inflammatory process is triggered in DR in which the innate immune response plays a relevant role. Alpha 1 antitrypsin (AAT), an inhibitor of serine proteases, has shown anti-inflammatory properties in several diseases...
May 17, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29778021/the-homing-of-human-umbilical-cord-derived-mesenchymal-stem-cells-and-the-subsequent-modulation-of-macrophage-polarization-in-type-2-diabetic-mice
#12
Yaqi Yin, Haojie Hao, Yu Cheng, Jieqing Gao, Jiejie Liu, Zongyan Xie, Qi Zhang, Li Zang, Weidong Han, Yiming Mu
Umbilical cord-derived mesenchymal stem cells (UC-MSCs), with both immunomodulatory and pro-regenerative properties, are promising for the treatment of type 2 diabetes mellitus (T2DM). As efficient cell therapy largely relies on appropriate homing to target tissues, knowing where and to what extent injected UC-MSCs have homed is critically important. However, bio-distribution data for UC-MSCs in T2DM subjects are extremely limited. Beneficial effects of UC-MSCs on T2DM subjects are associated with increased M2 macrophages, but no systemic evaluation of M2 macrophages has been performed in T2DM individuals...
May 15, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29776955/high-fat-diet-induced-inflammation-accelerates-prostate-cancer-growth-via-il6-signaling
#13
Takuji Hayashi, Kazutoshi Fujita, Satoshi Nojima, Yujiro Hayashi, Kosuke Nakano, Yu Ishizuya, Cong Wang, Yoshiyuki Yamamoto, Toshiro Kinouchi, Kyosuke Matsuzaki, Kentaro Jingushi, Taigo Kato, Atsunari Kawashima, Akira Nagahara, Takeshi Ujike, Motohide Uemura, Maria Del Carmen Rodriguez Pena, Jennifer B Gordetsky, Eiichi Morii, Kazutake Tsujikawa, George J Netto, Norio Nonomura
OBJECTIVE: High-fat diet (HFD) could induce prostate cancer progression. The aim of this study is to identify mechanisms of HFD-induced prostate cancer progression, focusing on inflammation. MATERIALS AND METHODS: We administered HFD and celecoxib to autochthonous immunocompetent Pb-Cre+; Pten(fl/fl) model mice for prostate cancer. Tumor growth was evaluated by tumor weight and Ki67 stain, and local immune cells were assessed by flow cytometry at 22 weeks of age...
May 18, 2018: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/29776717/m2-macrophages-promote-wound-induced-hair-neogenesis
#14
Akira Kasuya, Taisuke Ito, Yoshiki Tokura
BACKGROUND: De novo hair regeneration occurs in scars of normal adult mice. This interesting phenomenon is termed as wound-induced hair neogenesis (WIHN). We hypothesized that M2 macrophages are crucially involved in WIHN. OBJECTIVE: To clarify the contribution of M2 macrophages to WIHN. METHOD: We established a mouse model of WIHN. A full thickness skin excision was implemented on the back of C57BL/6 (B6) mice. Newly developing hair follicles were detected by a whole-mount assay...
May 12, 2018: Journal of Dermatological Science
https://www.readbyqxmd.com/read/29776615/a-new-and-efficient-culture-method-for-porcine-bone-marrow-derived-m1-and-m2-polarized-macrophages
#15
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/29775390/polarization-and-distribution-of-tumor-associated-macrophages-and-cox-2-expression-in-basal-cell-carcinoma-of-the-ocular-adnexae
#16
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
#17
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/29774026/critical-role-of-alternative-m2-skewing-in-mir-155-deletion-mediated-protection-of-colitis
#18
Jintao Li, Ji Zhang, Hongxia Guo, Shimin Yang, Weiping Fan, Nan Ye, Zhiqiang Tian, Tiantian Yu, Guoping Ai, Zigang Shen, Haiyang He, Ping Yan, Hui Lin, Xue Luo, Hongli Li, Yuzhang Wu
Inflammatory bowel disease (IBD) is associated with dysregulation of both innate and adaptive immune response in the intestine. MicroRNA (miR)-155 is frequently expressed and functions in many immune cell types. Besides its function in adaptive immunity, miR-155 is a key regulator of the innate immune response in macrophages, dendritic cells, and even in epithelia cells. Although the roles of miR-155 within T and B lymphocytes in colitis have been reported, its function in innate immune cells has not been thoroughly examined...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29771935/cell-iron-status-influences-macrophage-polarization
#19
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/29770139/spermine-alleviates-acute-liver-injury-by-inhibiting-liver-resident-macrophage-pro-inflammatory-response-through-atg5-dependent-autophagy
#20
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
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