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Myeloperoxidase

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https://www.readbyqxmd.com/read/28819143/immunomodulatory-and-antioxidant-effects-of-total-flavonoids-of-spatholobus-suberectus-dunn-on-pcv2-infected-mice
#1
Yuan-Fang Fu, Li-He Jiang, Wei-Dan Zhao, Meng Xi-Nan, Shi-Qi Huang, Jian Yang, Ting-Jun Hu, Hai-Lan Chen
Oxidative stress plays an important role in the pathogenesis of virus infection and antioxidants are becoming promising candidates as therapeutic agents. This study is designed to investigate the effect of total flavonoids of Spatholobus suberectus Dunn (TFSD) on oxidative stress in mice induced by porcine circovirus type 2 (PCV2) infection. The PCV2 infection leads to significant decrease in thymus and spleen indices, elevation of xanthine oxidase (XOD) and myeloperoxidase (MPO) activities, reduction in GSH level and GSH to GSSG ratio and decline of superoxide dismutase (SOD) activity, indicating the formation of immunosuppression and oxidative stress...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818791/low-density-lipoprotein-modified-by-myeloperoxidase-oxidants-induces-endothelial-dysfunction
#2
Adrian I Abdo, Benjamin S Rayner, David M van Reyk, Clare L Hawkins
Low-density lipoprotein (LDL) modified by hypochlorous acid (HOCl) produced by myeloperoxidase (MPO) is present in atherosclerotic lesions, where it is implicated in the propagation of inflammation and acceleration of lesion development by multiple pathways, including the induction of endothelial dysfunction. Thiocyanate (SCN(-)) ions are utilised by MPO to produce the oxidant hypothiocyanous acid (HOSCN), which reacts with LDL in a different manner to HOCl. Whilst the reactivity of HOCl-modified LDL has been previously studied, the role of HOSCN in the modification of LDL in vivo is poorly defined, although emerging evidence suggests that these particles have distinct biological properties...
August 5, 2017: Redox Biology
https://www.readbyqxmd.com/read/28817707/microbiome-mediated-neutrophil-recruitment-via-cxcr2-and-protection-from-amebic-colitis
#3
Koji Watanabe, Carol A Gilchrist, Md Jashim Uddin, Stacey L Burgess, Mayuresh M Abhyankar, Shannon N Moonah, Zannatun Noor, Jeffrey R Donowitz, Brittany N Schneider, Tuhinur Arju, Emtiaz Ahmed, Mamun Kabir, Masud Alam, Rashidul Haque, Patcharin Pramoonjago, Borna Mehrad, William A Petri
The disease severity of Entamoeba histolytica infection ranges from asymptomatic to life-threatening. Recent human and animal data implicate the gut microbiome as a modifier of E. histolytica virulence. Here we have explored the association of the microbiome with susceptibility to amebiasis in infants and in the mouse model of amebic colitis. Dysbiosis occurred symptomatic E. histolytica infection in children, as evidenced by a lower Shannon diversity index of the gut microbiota. To test if dysbiosis was a cause of susceptibility, wild type C57BL/6 mice (which are innately resistant to E...
August 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28817064/attenuation-of-multiple-organ-damage-by-continuous-low-dose-solvent-free-infusions-of-resveratrol-after-severe-hemorrhagic-shock-in-rats
#4
Tobias Müller, Michael Kirsch, Frank Petrat
Therapeutic effects of continuous intravenous infusions of solvent-free low doses of resveratrol on organ injury and systemic consequences resulting from severe hemorrhagic shock in rats were studied. Hemorrhagic shock was induced by withdrawing arterial blood until a mean arterial blood pressure (MAP) of 25-30 mmHg was reached. Following a shock phase of 60 min, rats were resuscitated with the withdrawn blood plus lactated Ringer's. Resveratrol (20 or 60 μg/kg × h) was continuously infused intravenously starting with the resuscitation phase (30 min) and continued until the end of the experiment (total treatment time 180 min)...
August 17, 2017: Nutrients
https://www.readbyqxmd.com/read/28816948/medial-medullary-infarction-caused-by-antineutrophil-cytoplasmic-antibody-related-vasculitis-case-report-and-review-of-the-literature
#5
Kumi Yanagiha, Kazuhiro Ishii, Tomoyuki Ueno, Aiki Marushima, Akira Tamaoka
RATIONALE: Medial medullary infarction accounts for less than 1% of brain infarctions, and medial medullary infarctions is very rarely caused by antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis. PATIENT CONCERNS: We report the case of a 76-year-old man at low risk of arteriosclerosis who presented with disorders on the left side including gaze-evoked nystagmus, paralysis of the extremities, pyramidal signs, sensory disturbance, and dysesthesia. Brain magnetic resonance imaging also showed right medial medullary infarction...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28816059/atherothrombosis-and-oxidative-stress-mechanisms-and-management-in-elderly
#6
Francesco Violi, Lorenzo Loffredo, Roberto Carnevale, Pasquale Pignatelli, Daniele Pastori
SIGNIFICANCE The incidence of cardiovascular events increases by aging, representing the main cause of death in old population. Aging is associated with over-production of reactive oxygen species (ROS), which may affect clotting and platelet activation, and impair endothelial function so predisposing elderly patients to thrombotic complications. RECENT ADVANCES There are increasing evidences to suggest that aging is associated with an imbalance between oxidative stress and antioxidant status. Thus, up-regulation of ROS-producing enzymes such as nicotinamide adenine dinucleotide phosphate (NADPH) oxidase and myeloperoxidase, along with down-regulation of antioxidant enzymes, such as superoxide dismutase and glutathione peroxidase, occur during aging...
August 17, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28815423/backbone-and-side-chain-1-h-15-n-and-13-c-resonance-assignments-of-a-novel-staphylococcal-inhibitor-of-myeloperoxidase
#7
Nicoleta T Ploscariu, Alvaro I Herrera, Srinivas Jayanthi, Thallapuranam K Suresh Kumar, Brian V Geisbrecht, Om Prakash
The bacterium Staphylococcus aureus produces an array of anti-inflammatory molecules that prevent the innate immune system from recognizing it as a pathogen and clearing it from the host. In the acute phase of inflammation, our immune system relies on neutrophils to clear invading bacteria. Recently, novel classes of secreted proteins from S. aureus, including the Extracellular Adherence Protein (EAP) family (Stapels et al., Proc Natl Acad Sci USA 111:13187-13192, 2014) and the Staphylococcal Peroxidase Inhibitor (SPIN), (unpublished work) have been identified as highly selective inhibitors acting on Neutrophil Serine Proteases (NSPs) and myeloperoxidase (MPO) respectively...
August 16, 2017: Biomolecular NMR Assignments
https://www.readbyqxmd.com/read/28814985/activation-of-endocannabinoid-receptor-2-as-a-mechanism-of-propofol-pretreatment-induced-cardioprotection-against-ischemia-reperfusion-injury-in-rats
#8
Hai-Jing Sun, Yan Lu, Hao-Wei Wang, Hao Zhang, Shuang-Ran Wang, Wen-Yun Xu, Hai-Long Fu, Xue-Ya Yao, Feng Yang, Hong-Bin Yuan
Propofol pretreatment before reperfusion, or propofol conditioning, has been shown to be cardioprotective, while its mechanism is unclear. The current study investigated the roles of endocannabinoid signaling in propofol cardioprotection in an in vivo model of myocardial ischemia/reperfusion (I/R) injury and in in vitro primary cardiomyocyte hypoxia/reoxygenation (H/R) injury. The results showed that propofol conditioning increased both serum and cell culture media concentrations of endocannabinoids including anandamide (AEA) and 2-arachidonoylglycerol (2-AG) detected by LC-MS/MS...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28811951/granulomatosis-with-polyangiitis-presenting-as-pyrexia-of-unknown-origin-leukocytosis-and-microangiopathic-haemolytic-anemia
#9
Sima Terebelo, Iona Chen
A 66-year-old woman presented to the Emergency Department with a florid sepsis-like picture, a two-week history of fever, relative hypotension with end organ ischemia (unexplained liver enzyme and troponin elevations), and nonspecific constitutional symptoms. She was initially found to have a urinary tract infection but, despite appropriate treatment, her fever persisted and her white blood cell count continued to rise. During her hospitalization the patient manifested leukocytosis to 47,000 WBC/μL, ESR 67 mm/hr (normal range 0-42 mm/hr), CRP 17...
2017: Case Reports in Rheumatology
https://www.readbyqxmd.com/read/28811292/dapagliflozin-slows-the-progression-of-the-renal-and-liver-fibrosis-associated-with-type-2-diabetes
#10
Li Tang, Yuanyuan Wu, Mi Tian, C David Sjostrom, Ulrika Johansson, Xiao-Rong Peng, David M Smith, Yufeng Huang
Sodium-glucose cotransporter 2 (SGLT2) inhibitors are a new class of antidiabetic oral agents indicating promising effects on cardiovascular and renal end points. However, the renoprotective effects of SGLT2 inhibitors are not fully understood. Also, metabolic effects of SGLT2 inhibition on other organ systems such as effects on hepatic steatosis are not fully understood. This study sought to address these questions by treating 18week-old uninephrectomized db/db mice with a selective SGLT2 inhibitor dapagliflozin...
August 15, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28810614/evolution-of-correlation-between-helicobacter-pylori-infection-and-autoimmune-liver-disease
#11
Xin-Guo Peng, Yu-Yuan Li, Hui-Ting Chen, Yan Zhou, Jian-Guo Ma, Hong-Min Yin
The present study was planned to evaluate correlation between Helicobacter pylori (HP) infection and autoimmune liver disease (AILD). A total of 60 patients diagnosed with AILD in Affiliated Hospital of Binzhou Medical College were continuously enrolled in the present study. HP infection was detected by 13C-urea breath test. The levels of anti-myeloperoxidase were tested by ELISA. The positive rate of anti-nuclear antibody (ANA), anti-mitochondrial antibody (AMA), anti-smooth muscle antibody (SMA) and anti-neutrophil cytoplasm antibody (ANCA) were tested by indirect immunofluorescence...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810577/patchouli-oil-ameliorates-acute-colitis-a-targeted-metabolite-analysis-of-2-4-6-trinitrobenzenesulfonic-acid-induced-rats
#12
Xiuting Yu, Guanghua Yang, Hua Jiang, Shuhai Lin, Yuhong Liu, Xie Zhang, Huifang Zeng, Ziren Su, Song Huang, Linlin Shen, Xiaojun Zhang
The incidence of inflammatory bowel disease (IBD), characterized by chronic, relapsing intestinal inflammation, has continually increased in recent years. A previous study by our group identified five potential metabolic markers possibly associated with the pathology of 2,4,6-trinitrobenzenesulfonic acid (TNBS)-induced IBD in rats. The present study aimed to examine the potential therapeutic effects of the essential oil of Pogostemon cablin (also known as patchouli; PO) on TNBS-induced rats and investigate the concomitant metabolic changes by targeting the previously identified potential markers...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810554/beneficial-effects-of-dried-pomegranate-juice-concentrated-powder-on-ultraviolet-b-induced-skin-photoaging-in-hairless-mice
#13
Su-Jin Kang, Beom-Rak Choi, Seung-Hee Kim, Hae-Yeon Yi, Hye-Rim Park, Chang-Hyun Song, Sae-Kwang Ku, Young-Joon Lee
The present study investigated the anti-aging effects of pomegranate juice concentrated powder (PCP) in hairless mice following 15 weeks of UVB irradiation (three times a week; 0.18 J/cm(2)). Skin moisturizing effects were evaluated through skin water, collagen type I and hyaluronan contents, as well as collagen type I and hyaluronan synthesis-related transcript levels. Wrinkle formation and edema scores (skin weights) were also assessed, along with skin matrix metalloproteinase (MMP)-1, MMP-9 and MMP-13 transcript levels...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810518/ameliorative-effects-of-artemisia-pallens-in-a-murine-model-of-ovalbumin-induced-allergic-asthma-via-modulation-of-biochemical-perturbations
#14
Anwesha A Mukherjee, Amit D Kandhare, Supada R Rojatkar, Subhash L Bodhankar
INTRODUCTION: Asthma is a chronic, heterogeneous airway disorder characterized by airway inflammatory and remodeling. Artemisia pallens has been reported to possess antioxidant, anti-inflammatory and Anti-allergic potential. OBJECTIVE: To evaluate the anti-asthmatic effects of methanolic extract of Artemisia pallens (APME) against ovalbumin (OVA)-induced airway hyperresponsiveness (AHR) in rats. MATERIALS AND METHOD: AHR was induced in male Sprague-Dawley rats (180-200g) by intraperitoneal (i...
August 10, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28810517/argan-oil-reduces-oxidative-stress-genetic-damage-and-emperipolesis-in-rats-treated-with-acrylamide
#15
Zülal Atlı Şekeroğlu, Birsen Aydın, Vedat Şekeroğlu
Acrylamide (AA), a well-known toxicant, is present in high-temperature-processed foods in heated foods. Argan oil (AO), a natural vegetable oil, is receiving increasing attention due to its powerful biological properties. However, limited information is available about its effects in lymphoid organs and bone marrow. The aim of this study is to investigate the effects of AO on hematological parameters, 8-hydroxydeoxyguanosine (8-OHdG), thiobarbituric acid reactive substances (TBARs), protein carbonyl (PCO), glutathione (GSH), myeloperoxidase (MPO) levels, the formation of micronucleus (MN) and megakaryocytic emperipolesis (ME) against AA-induced toxicity in rats...
August 10, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28808383/chemopreventive-potential-of-major-flavonoid-compound-of-methanolic-bark-extract-of-saraca-asoca-roxb-in-benzene-induced-toxicity-of-acute-myeloid-leukemia-mice
#16
Manas Kumar Mukhopadhyay, Mithun Shaw, Debjani Nath
BACKGROUND: Saraca asoca (SA) (Roxb.) is one of the folk medicinal plants found in India, Bangladesh, and Sri Lanka. Its major biological activity appears due to the presence of flavonoid group of compounds in its bark extract. OBJECTIVE: In this study, our research aims to analyze the chemopreventive effect of flavonoids, especially a natural phenol catechin present in the bark methanolic extract of SA on acute myeloid leukemia (AML) mice. MATERIALS AND METHODS: The total bark extract was partitioned and analyzed on thin-layer chromatography (TLC) plate...
July 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28808186/oxygenation-inflammatory-response-and-lung-injury-during-one-lung-ventilation-in-rabbits-using-inspired-oxygen-fraction-of-0-6-vs-1-0
#17
Zeping Xu, Lianbing Gu, Qingming Bian, Pengyi Li, Lijun Wang, Jingyuan Zhang, Yanning Qian
Maintaining adequate oxygenation during one-lung ventilation (OLV) requires high inspired oxygen fraction (FiO2). However, high FiO2 also causes inflammatory response and lung injury. Therefore, it remains a great interest to clinicians and scientists to optimize the care of patients undergoing OLV. The aim of this study was to determine and compare oxygenation, inflammatory response and lung injury during OLV in rabbits using FiO2 of 0.6 vs. 1.0. After 30 minutes of two-lung ventilation (TLV) as baseline, 30 rabbits were randomly assigned to three groups receiving mechanical ventilation for 3 hours: the sham group, receiving TLV with 0...
October 17, 2016: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28808028/immune-evasion-by-a-staphylococcal-inhibitor-of-myeloperoxidase
#18
Nienke W M de Jong, Kasra X Ramyar, Fermin E Guerra, Reindert Nijland, Cindy Fevre, Jovanka M Voyich, Alex J McCarthy, Brandon L Garcia, Kok P M van Kessel, Jos A G van Strijp, Brian V Geisbrecht, Pieter-Jan A Haas
Staphylococcus aureus is highly adapted to its host and has evolved many strategies to resist opsonization and phagocytosis. Even after uptake by neutrophils, S. aureus shows resistance to killing, which suggests the presence of phagosomal immune evasion molecules. With the aid of secretome phage display, we identified a highly conserved protein that specifically binds and inhibits human myeloperoxidase (MPO), a major player in the oxidative defense of neutrophils. We have named this protein "staphylococcal peroxidase inhibitor" (SPIN)...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28807216/early-resuscitation-with-exendin-4-alleviates-acute-lung-injury-after-hemorrhagic-shock-in-rats
#19
Xiang Song, Gan Chen, Xin Luo, Guoxing You, Yujing Yin, Ying Wang, Lian Zhao, Hong Zhou
BACKGROUND: Oxidative stress induced by hemorrhagic shock (HS) is known to initiate a systemic inflammatory response, which leads to subsequent acute lung injury. This study is aimed to assess the efficacy of exendin-4 (Ex-4) in attenuating lung injury in a rat model of HS and resuscitation (HS/R). METHODS: HS was induced in sodium pentobarbital-anesthetized adult male Wistar rats by withdrawing blood to maintain a mean arterial pressure of 30-35 mm Hg for 50 min...
August 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28807207/effect-of-bevacizumab-on-acetic-acid-induced-ulcerative-colitis-in-rats
#20
Zeki Ozsoy, Seyma Ozsoy, Fikret Gevrek, Emre Demir, Ismail Benli, Emin Daldal, Erdinc Yenidogan
BACKGROUND: The aim of this study was to examine the effect of intraperitoneally administered bevacizumab on colitis induced by acetic acid. METHODS: An experimental model of acetic acid-induced colitis was introduced in rats. After the induction of colitis, bevacizumab was administered intraperitoneally at two different daily doses of low (2.5 mg/kg) or high (5 mg/kg) concentration. Control groups were included for colitis and bevacizumab. After 7 d, the rats were sacrificed, and colonic tissues were harvested for macroscopic and microscopic examination of colonic damage...
August 2017: Journal of Surgical Research
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