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Arginine methylation macrophage

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https://www.readbyqxmd.com/read/29121802/hispolon-suppresses-lps-or-lta-induced-inos-no-production-and-apoptosis-in-bv-2-microglial-cells
#1
Ming-Shun Wu, Chih-Chiang Chien, Kur-Ta Cheng, Gottumukkala V Subbaraju, Yen-Chou Chen
Hispolon (HIS) is an active polyphenol compound derived from Phellinus linteus (Berkeley & Curtis), and our previous study showed that HIS effectively inhibited inflammatory responses in macrophages (Yang et al., 2014); however, its effect on neuronal inflammation is still undefined. In this study, HIS concentration- and time-dependently inhibited lipopolysaccharide (LPS)- and lipoteichoic acid (LTA)-induced inducible nitric oxide (NO) synthase (iNOS)/NO production with increased heme oxygenase (HO)-1 proteins in BV-2 microglial cells...
November 9, 2017: American Journal of Chinese Medicine
https://www.readbyqxmd.com/read/28771838/human-regulatory-macrophages-are-potent-in-suppression-of-the-xenoimmune-response-via-indoleamine-2-3-dioxygenase-involved-mechanism-s
#2
Fei Guo, Min Hu, Dandan Huang, Yuanfei Zhao, Benjamin Heng, Gilles Guillemin, Chai K Lim, Wayne J Hawthorne, Shounan Yi
BACKGROUND: For xenotransplantation to truly succeed, we must develop immunomodulatory strategies to suppress the xenoimmune response but by minimizing immunosuppression over the long term. Regulatory macrophages (Mreg) have been shown to suppress polyclonal T-cell proliferation in vitro and prolong allograft survival in vivo. However, the question of whether they are capable of suppressing xenoimmune responses remains unknown. This study assessed the potential of human Mreg to be used as an effective immunomodulatory method in xenotransplantation...
August 2, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28698893/cytotoxicity-against-tumor-cell-lines-and-anti-inflammatory-properties-of-chitinases-from-calotropis-procera-latex
#3
Carolina Araújo Viana, Márcio V Ramos, José Delano Barreto Marinho Filho, Letícia Veras Costa Lotufo, Ingrid Samantha Tavares Figueiredo, Jefferson Soares de Oliveira, Pietro Mastroeni, José Vitor Lima-Filho, Nylane Maria Nunes Alencar
The role of chitinases from the latex of medicinal shrub Calotropis procera on viability of tumor cell lines and inflammation was investigated. Soluble latex proteins were fractionated in a CM Sepharose Fast-Flow Column and the major peak (LPp1) subjected to ion exchange chromatography using a Mono-Q column coupled to an FPLC system. In a first series of experiments, immortalized macrophages were cultured with LPp1 for 24 h. Then, cytotoxicity of chitinase isoforms (LPp1-P1 to P6) was evaluated against HCT-116 (colon carcinoma), OVCAR-8 (ovarian carcinoma), and SF-295 (glioblastoma) tumor cell lines in 96-well plates...
July 11, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28652407/arginine-methylation-regulates-c-myc-dependent-transcription-by-altering-promoter-recruitment-of-the-acetyltransferase-p300
#4
Irina Tikhanovich, Jie Zhao, Brian Bridges, Sean Kumer, Ben Roberts, Steven A Weinman
Protein arginine methyltransferase 1 (PRMT1) is an essential enzyme controlling about 85% of the total cellular arginine methylation in proteins. We have shown previously that PRMT1 is an important regulator of innate immune responses and that it is required for M2 macrophage differentiation. c-Myc is a transcription factor that is critical in regulating cell proliferation and also regulates the M2 transcriptional program in macrophages. Here, we sought to determine whether c-Myc in myeloid cells is regulated by PRMT1-dependent arginine methylation...
August 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28587176/bifunctional-enzyme-jmjd6-contributes-to-multiple-disease-pathogenesis-new-twist-on-the-old-story
#5
REVIEW
Shiva Shankar Vangimalla, Murali Ganesan, Kusum K Kharbanda, Natalia A Osna
Jumonji domain-containing protein 6 (JMJD6) is a non-heme Fe(II) 2-oxoglutarate (2OG)-dependent oxygenase with arginine demethylase and lysyl hydroxylase activities. Its initial discovery as a dispensable phosphatidylserine receptor (PSR) in the cell membrane of macrophages for phagocytosis was squashed by newer studies which revealed its nuclear localization and bifunctional enzymatic activity. Though its interaction with several nuclear and cytoplasmic target proteins has been demonstrated, the exact mechanisms and clinical significance of these various biologic interplays are not yet well established...
June 1, 2017: Biomolecules
https://www.readbyqxmd.com/read/28454271/intracellular-and-extracellular-factors-influencing-the-genotoxicity-of-nitric-oxide-and-reactive-oxygen-species
#6
Min Young Kim
A number of factors affect cellular responses to nitric oxide (NO(•)) and reactive oxygen species (ROS), including their source, concentration, cumulative dose, target gene and biological milieu. This limits the extrapolation of data to in vivo pathological states in which NO(•) and ROS may be important. The present study investigated lethality and mutagenesis in the HPRT and TK1 genes of human lymphoblastoid TK6 cells exposed to NO(•) and ROS derived from two delivery methods: A reactor system and a Transwell™ co-culture...
March 2017: Oncology Letters
https://www.readbyqxmd.com/read/28330868/protein-arginine-methyltransferase-1-modulates-innate-immune-responses-through-regulation-of-peroxisome-proliferator-activated-receptor-%C3%AE-dependent-macrophage-differentiation
#7
Irina Tikhanovich, Jie Zhao, Jody Olson, Abby Adams, Ryan Taylor, Brian Bridges, Laurie Marshall, Benjamin Roberts, Steven A Weinman
Arginine methylation is a common posttranslational modification that has been shown to regulate both gene expression and extranuclear signaling events. We recently reported defects in protein arginine methyltransferase 1 (PRMT1) activity and arginine methylation in the livers of cirrhosis patients with a history of recurrent infections. To examine the role of PRMT1 in innate immune responses in vivo, we created a cell type-specific knock-out mouse model. We showed that myeloid-specific PRMT1 knock-out mice demonstrate higher proinflammatory cytokine production and a lower survival rate after cecal ligation and puncture...
April 28, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28094290/protein-arginine-methyltransferase-1-prmt1-represses-mhc-ii-transcription-in-macrophages-by-methylating-ciita
#8
Zhiwen Fan, Jianfei Li, Ping Li, Qing Ye, Huihui Xu, Xiaoyan Wu, Yong Xu
Efficient presentation of alien antigens triggers activation of T lymphocytes and robust host defense against invading pathogens. This pathophysiological process relies on the expression of major histocompatibility complex (MHC) molecules in antigen presenting cells such as macrophages. Aberrant MHC II transactivation plays a crucial role in the pathogenesis of atherosclerosis. Class II transactivator (CIITA) mediates MHC II induction by interferon gamma (IFN-γ). CIITA activity can be fine-tuned at the post-translational level, but the mechanisms are not fully appreciated...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/27601438/ibuprofen-arginate-retains-enos-substrate-activity-and-reverses-endothelial-dysfunction-implications-for-the-cox-2-adma-axis
#9
Nicholas S Kirkby, Abel Tesfai, Blerina Ahmetaj-Shala, Hime H Gashaw, Walkyria Sampaio, Gisele Etelvino, Nádia Miricéia Leão, Robson A Santos, Jane A Mitchell
Nonsteroidal antiinflammatory drugs, including ibuprofen, are among the most commonly used medications and produce their antiinflammatory effects by blocking cyclooxygenase (COX)-2. Their use is associated with increased risk of heart attacks caused by blocking COX-2 in the vasculature and/or kidney, with our recent work implicating the endogenous NOS inhibitor asymmetric dimethylarginine (ADMA), a cardiotoxic hormone whose effects can be prevented by l-arginine. The ibuprofen salt ibuprofen arginate (Spididol) was created to increase solubility but we suggest that it could also augment the NO pathway through codelivery of arginine...
December 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27522963/omega-3-fatty-acid-supplement-prevents-development-of-intracranial-atherosclerosis
#10
Jiamei Shen, Adam Hafeez, James Stevenson, Jianjie Yang, Changbin Yin, Fengwu Li, Sainan Wang, Huishan Du, Xunming Ji, Jose A Rafols, Xiaokun Geng, Yuchuan Ding
OBJECTIVES: Intracranial atherosclerotic stenosis (ICAS) is one of the most common causes of stroke worldwide and, in particular, has been implicated as a leading cause of recurrent ischemic stroke. We adapted a rat model of atherosclerosis to study brain intracranial atherosclerosis, and further investigated the effect of omega-3 fatty acids (O3FA) in attenuating development of ICAS. MATERIALS AND METHODS: Adult male Sprague-Dawley rats were divided into control normal-cholesterol or high-cholesterol diet groups with or without O3FA for up to 6weeks...
October 15, 2016: Neuroscience
https://www.readbyqxmd.com/read/27221119/insulin-decreases-atherosclerotic-plaque-burden-and-increases-plaque-stability-via-nitric-oxide-synthase-in-apolipoprotein-e-null-mice
#11
Yusaku Mori, Simon Chiang, Michelle P Bendeck, Adria Giacca
It has been argued whether insulin accelerates or prevents atherosclerosis. Although results from in vitro studies have been conflicting, recent in vivo mice studies demonstrated antiatherogenic effects of insulin. Insulin is a known activator of endothelial nitric oxide synthase (NOS), leading to increased production of NO, which has potent antiatherogenic effects. We aimed to examine the role of NOS in the protective effects of insulin against atherosclerosis. Male apolipoprotein E-null mice (8 wk old) fed a high-cholesterol diet (1...
August 1, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27007815/the-nitric-oxide-synthase-inhibitor-ng-nitro-l-arginine-methyl-ester-diminishes-the-immunomodulatory-effects-of-parental-arginine-in-rats-with-subacute-peritonitis
#12
Hui-Chen Lo, Ching-Yi Hung, Fu-Huan Huang, Tzu-Cheng Su, Chien-Hsing Lee
The combined treatment of parenteral arginine and the nitric oxide synthase inhibitor NG-nitro-L-arginine methyl ester (L-NAME) have been shown to improve liver function and systemic inflammation in subacute peritonitic rats. Here, we investigated the effects of single and combined parenteral arginine and L-NAME treatments on leukocyte and splenocyte immunity. Male Wistar rats were subjected to cecal punctures and were intravenously given total parenteral nutrition solutions with or without arginine and/or L-NAME supplementations for 7 days...
2016: PloS One
https://www.readbyqxmd.com/read/26988069/cd70-exacerbates-blood-pressure-elevation-and-renal-damage-in-response-to-repeated-hypertensive-stimuli
#13
Hana A Itani, Liang Xiao, Mohamed A Saleh, Jing Wu, Mark A Pilkinton, Bethany L Dale, Natalia R Barbaro, Jason D Foss, Annet Kirabo, Kim R Montaniel, Allison E Norlander, Wei Chen, Ryosuke Sato, L Gabriel Navar, Simon A Mallal, Meena S Madhur, Kenneth E Bernstein, David G Harrison
RATIONALE: Accumulating evidence supports a role of adaptive immunity and particularly T cells in the pathogenesis of hypertension. Formation of memory T cells, which requires the costimulatory molecule CD70 on antigen-presenting cells, is a cardinal feature of adaptive immunity. OBJECTIVE: To test the hypothesis that CD70 and immunologic memory contribute to the blood pressure elevation and renal dysfunction mediated by repeated hypertensive challenges. METHODS AND RESULTS: We imposed repeated hypertensive challenges using either N(ω)-nitro-L-arginine methyl ester hydrochloride (L-NAME)/high salt or repeated angiotensin II stimulation in mice...
April 15, 2016: Circulation Research
https://www.readbyqxmd.com/read/26940641/expression-of-inducible-nitric-oxide-synthase-in-mast-cells-contributes-to-the-regulation-of-inflammatory-cytokines-in-irritable-bowel-syndrome-with-diarrhea
#14
S An, G Zong, Z Wang, J Shi, H Du, J Hu
BACKGROUND: Nitric oxide (NO) and mast cells (MCs) are possibly involved in the development of irritable bowel syndrome (IBS), but details on their role and interactions still remain undetermined. We aimed to investigate the expression of inducible NO synthase (iNOS) in MCs of the colon of IBS with diarrhea (IBS-D), and elucidated a potential role of NO in the differential regulation of cytokines in MCs. METHODS: Colonic mucosal biopsies of 19 IBS-D patients and 16 healthy controls were collected...
July 2016: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/26599209/il4i1-is-a-novel-regulator-of-m2-macrophage-polarization-that-can-inhibit-t-cell-activation-via-l-tryptophan-and-arginine-depletion-and-il-10-production
#15
Yinpu Yue, Wei Huang, Jingjing Liang, Jing Guo, Jian Ji, Yunliang Yao, Mingzhu Zheng, Zhijian Cai, Linrong Lu, Jianli Wang
Interleukin 4-induced gene-1 (IL4I1) was initially described as an early IL-4-inducible gene in B cells. IL4I1 protein can inhibit T cell proliferation by releasing its enzymatic catabolite, H2O2, and this effect is associated with transient down-regulation of T cell CD3 receptor-zeta (TCRζ) expression. Herein, we show that IL4I1 contributes to the regulation of macrophage programming. We found that expression of IL4I1 increased during bone marrow-derived macrophage (BMDM) differentiation, expression of IL4I1 is much higher in primary macrophages than monocytes, and IL4I1 expression in BMDMs could be induced by Th1 and Th2 cytokines in two different patterns...
2015: PloS One
https://www.readbyqxmd.com/read/26568365/mycobacteria-modulate-host-epigenetic-machinery-by-rv1988-methylation-of-a-non-tail-arginine-of-histone-h3
#16
Imtiyaz Yaseen, Prabhjot Kaur, Vinay Kumar Nandicoori, Sanjeev Khosla
Mycobacteria are successful pathogens that modulate the host immune response through unclear mechanisms. Here we show that Rv1988, a secreted mycobacterial protein, is a functional methyltransferase that localizes to the host nucleus and interacts with chromatin. Rv1988 methylates histone H3 at H3R42 and represses the genes involved in the first line of defence against mycobacteria. H3R42me2, a non-tail histone modification, is present at the entry and exit point of DNA in the nucleosome and not within the regulatory sites in the N-terminal tail...
November 16, 2015: Nature Communications
https://www.readbyqxmd.com/read/26490086/time-course-of-cardiac-inflammation-during-nitric-oxide-synthase-inhibition-in-shr-impact-of-prior-transient-ace-inhibition
#17
Lauren A Biwer, Karen M D'souza, Ali Abidali, Danni Tu, Ashley L Siniard, Matthew DeBoth, Matthew Huentelman, Taben M Hale
We have previously demonstrated that angiotensin-converting enzyme (ACE) inhibition with enalapril produces persistent effects that protect against future nitric oxide synthase (NOS) inhibitor (L-arginine methyl ester, L-NAME)-induced cardiac dysfunction and outer wall collagen deposition in spontaneously hypertensive rats (SHR). In the present study, we dissect the cytokine/chemokine release profile during NOS inhibition, its correlation to pathological cardiac remodeling and the impact of transient ACE inhibition on these effects...
January 2016: Hypertension Research: Official Journal of the Japanese Society of Hypertension
https://www.readbyqxmd.com/read/26434505/inhibition-of-peptidylarginine-deiminase-attenuates-inflammation-and-improves-survival-in-a-rat-model-of-hemorrhagic-shock
#18
Wei He, Peter Zhou, Zhigang Chang, Baoling Liu, Xuefeng Liu, Yanming Wang, Yongqing Li, Hasan B Alam
BACKGROUND: We have recently shown that inhibition of peptidylarginine deiminase (PAD) improves survival in a rodent model of lethal cecal ligation and puncture. The roles of PAD inhibitors in hemorrhagic shock (HS), however, are largely unknown. The goal of this study was to investigate the effects of YW3-56, a novel PAD inhibitor, on survival after severe HS. METHODS: Mouse macrophages were exposed to hypoxic conditions followed by reoxygenation in the presence or absence of YW3-56...
February 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/26371174/persistent-change-in-cardiac-fibroblast-physiology-after-transient-ace-inhibition
#19
K M D'Souza, L A Biwer, L Madhavpeddi, P Ramaiah, W Shahid, T M Hale
Transient angiotensin-converting enzyme (ACE) inhibition induces persistent changes that protect against future nitric oxide synthase (NOS) inhibitor-induced cardiac fibrosis and inflammation. Given the role of fibroblasts in mediating these effects, the present study investigates whether prior ACE inhibition produced persistent changes in cardiac fibroblast physiology. Adult male spontaneously hypertensive rats (SHRs) were treated with vehicle (C+L) or the ACE inhibitor, enalapril (E+L) for 2 wk followed by a 2-wk washout period and a subsequent 7-day challenge with the NOS inhibitor N(ω)-nitro-l-arginine methyl ester...
October 2015: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/26181487/structure-activity-relationship-based-optimization-of-small-temporin-shf-analogs-with-potent-antibacterial-activity
#20
Sonia André, Shannon K Washington, Emily Darby, Marvin M Vega, Ari D Filip, Nathaniel S Ash, Katy A Muzikar, Christophe Piesse, Thierry Foulon, Daniel J O'Leary, Ali Ladram
Short antimicrobial peptides represent attractive compounds for the development of new antibiotic agents. Previously, we identified an ultrashort hydrophobic and phenylalanine-rich peptide, called temporin-SHf, representing the smallest natural amphibian antimicrobial peptide known to date. Here, we report on the first structure-activity relationship study of this peptide. A series of temporin-SHf derivatives containing insertion of a basic arginine residue as well as residues containing neutral hydrophilic (serine and α-hydroxymethylserine) and hydrophobic (α-methyl phenylalanine and p-(t)butyl phenylalanine) groups were designed to improve the antimicrobial activity, and their α-helical structure was investigated by circular dichroism and nuclear magnetic resonance spectroscopy...
October 16, 2015: ACS Chemical Biology
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