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Endotoxin, LPS

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https://www.readbyqxmd.com/read/29344006/histone-deacetylase-2-hdac2-attenuates-lipopolysaccharide-lps-induced-inflammation-by-regulating-pai-1-expression
#1
Wen-Feng Fang, Yu-Mu Chen, Chiung-Yu Lin, Hui-Lin Huang, Hua Yeh, Ya-Ting Chang, Kuo-Tung Huang, Meng-Chih Lin
Background: Sepsis is a life-threatening organ dysfunction caused by dysregulated host response to infection, and is primarily characterized by an uncontrolled systemic inflammatory response. In the present study, we developed an effective adjunct therapy mediated by a novel mechanism, to attenuate overt inflammation. LPS-treated macrophages were adopted as an in vitro model of endotoxin-induced inflammation during sepsis. Experiments were carried out using primary mouse peritoneal macrophages and the murine macrophage cell line RAW264...
2018: Journal of Inflammation
https://www.readbyqxmd.com/read/29343645/crystal-structure-of-the-mammalian-lipopolysaccharide-detoxifier
#2
Alexei Gorelik, Katalin Illes, Bhushan Nagar
LPS is a potent bacterial endotoxin that triggers the innate immune system. Proper recognition of LPS by pattern-recognition receptors requires a full complement of typically six acyl chains in the lipid portion. Acyloxyacyl hydrolase (AOAH) is a host enzyme that removes secondary (acyloxyacyl-linked) fatty acids from LPS, rendering it immunologically inert. This activity is critical for recovery from immune tolerance that follows Gram-negative infection. To understand the molecular mechanism of AOAH function, we determined its crystal structure and its complex with LPS...
January 17, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29343555/antagonism-of-integrin-cd11b-affords-protection-against-endotoxin-shock-and-polymicrobial-sepsis-via-attenuation-of-hmgb1-nucleocytoplasmic-translocation-and-extracellular-release
#3
Huiting Zhou, Yanhong Li, Huan Gui, He Zhao, Ming Wu, Gang Li, Yiping Li, Zhenjiang Bai, Zhimin Yin, H Paul Redmond, Jian Wang, Jiang Huai Wang, Zhihui Zhao
High mobility group box 1 (HMGB1), a chromatin-binding nuclear protein, plays a critical role in sepsis by acting as a key "late-phase" inflammatory mediator. Integrin CD11b is essential for inflammatory cell activation and migration, thus mediating inflammatory responses. However, it is unclear whether CD11b participates in the development of sepsis. In this study, we report that CD11b contributes to LPS-induced endotoxin shock and microbial sepsis, as antagonism of CD11b with the CD11b blocking Ab or CD11b inhibitor Gu-4 protects mice against LPS- and microbial sepsis-related lethality, which is associated with significantly diminished serum HMGB1 levels...
January 17, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29339319/treatment-with-the-noradrenaline-re-uptake-inhibitor-atomoxetine-alone-and-in-combination-with-the-%C3%AE-2-adrenoceptor-antagonist-idazoxan-attenuates-loss-of-dopamine-and-associated-motor-deficits-in-the-lps-inflammatory-rat-model-of-parkinson-s-disease
#4
Justin D Yssel, Eoin O'Neill, Yvonne M Nolan, Thomas J Connor, Andrew Harkin
The impact of treatment with the noradrenaline (NA) re-uptake inhibitor atomoxetine and the α2-adrenoceptor (AR) antagonist idazoxan in an animal model of Parkinson's disease (PD) was assessed. Concurrent systemic treatment with atomoxetine and idazoxan, a combination which serves to enhance the extra-synaptic availability of NA, exerts anti-inflammatory and neuroprotective effects following delivery of an inflammatory stimulus, the bacterial endotoxin, lipopolysaccharide (LPS) into the substantia nigra. Lesion-induced deficits in motor function (akinesia, forelimb-use asymmetry) and striatal dopamine (DA) loss were rescued to varying degrees depending on the treatment...
January 12, 2018: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29331341/effects-of-the-gut-liver-axis-on-ischemia-mediated-hepatocellular-carcinoma-recurrence-in-the-mouse-liver
#5
Lorenzo A Orci, Stéphanie Lacotte, Vaihere Delaune, Florence Slits, Graziano Oldani, Vladimir Lazarevic, Carlo Rossetti, Laura Rubbia-Brandt, Philippe Morel, Christian Toso
BACKGROUND & AIMS: There is growing evidence that liver graft ischemia-reperfusion (I/R) is a risk factor for hepatocellular carcinoma (HCC) recurrence, but the involved mechanisms are unclear. Here, we tested the hypothesis that mesenteric congestion due to portal blood flow interruption induces endotoxin-mediated Toll-Like Receptor 4 (Tlr4) engagement, resulting in elevated liver cancer burden. We also assessed the role of remote ischemic preconditioning (RIPC) in this context. METHODS: C57Bl/6j mice were exposed to standardized models of liver I/R injury and RIPC, by occluding hepatic and femoral blood vessels...
January 10, 2018: Journal of Hepatology
https://www.readbyqxmd.com/read/29328416/endotoxin-tolerance-induced-by-lipopolysaccharide-preconditioning-protects-against-surgery%C3%A2-induced-cognitive-impairment-in-aging-mice
#6
Zhijie Zhang, Muhuo Ji, Yanlin Liao, Jianjun Yang, Jun Gao
Postoperative cognitive dysfunction (POCD) is a clinical syndrome characterized by varying degrees of cognitive functional decline in patients following major surgery. Inflammation and a dysregulated innate immune system exert broad effects in the periphery and central nervous system, yet the mechanisms underlying POCD remain poorly understood and without effective therapy. It has been reported that modulation of the dysregulated inflammatory response with low‑dose lipopolysaccharide (LPS) preconditioning, a phenomenon additionally referred to as endotoxin tolerance, has the potential to reduce neuroinflammation, blood‑brain barrier disruption, and cognitive impairment in a number of disease states...
January 2, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29327281/effect-of-early-natal-supplementation-of-paracetamol-on-attenuation-of-exotoxin-endotoxin-induced-pyrexia-and-precipitation-of-autistic-like-features-in-albino-rats
#7
Abdulaziz S Saeedan, Indu Singh, Mohd Nazam Ansari, Manjari Singh, Jitendra K Rawat, Uma Devi, Swetlana Gautam, Rajnish K Yadav, Gaurav Kaithwas
The present study was aimed to test the hypothesis that paracetamol (PCM) can precipitate autistic like features when used to counteract vaccine-induced fever using experimental rat pups. The pups were treated with measles mumps rubella (MMR) vaccine, diphtheria tetanus and pertussis (DPT) vaccines and lipopolysaccharide (LPS) with subsequent PCM treatment. The pups were evaluated for postnatal growth (weight gain, eye opening) and behavior alterations (swimming performance, olfactory discrimination, negative geotaxis, nociception, and locomotor activity) by performing battery of neurobehavioral test...
January 11, 2018: Inflammopharmacology
https://www.readbyqxmd.com/read/29314490/a-mixture-of-lactobacillus-species-isolated-from-traditional-fermented-foods-promote-recovery-from-antibiotic-induced-intestinal-disruption-in-mice
#8
Ying Shi, Xi Zhao, Zhao Jianxin, Zhang Hao, Qixiao Zhai, Arjan Narbad, Wei Chen
AIMS: This study evaluated the antibiotic-induced changes in microbial ecology, intestinal dysbiosis and low-grade inflammation; and the combined effect of four different Lactobacillus species on recovery of microbiota composition and improvement of gut barrier function in mice. METHODS AND RESULTS: Administration of the antibiotic ampicillin for 2 weeks decreased microbial community diversity, induced caecum tumefaction and increased gut permeability in mice. Application of a probiotic cocktail of four Lactobacillus species (JUP-Y4) modulated the microbiota community structure and promoted the abundance of potentially beneficial bacteria such as Akkermansia...
January 3, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29304053/prior-exposure-to-corticosterone-markedly-enhances-and-prolongs-the-neuroinflammatory-response-to-systemic-challenge-with-lps
#9
Kimberly A Kelly, Lindsay T Michalovicz, Julie V Miller, Vincent Castranova, Diane B Miller, James P O'Callaghan
Systemic exposure to the inflammagen and bacterial endotoxin lipopolysaccharide (LPS) has been widely used to evaluate inflammation and sickness behavior. While many inflammatory conditions occur in the periphery, it is well established that peripheral inflammation can affect the brain. Neuroinflammation, the elaboration of proinflammatory mediators in the CNS, commonly is associated with behavioral symptoms (e.g., lethargy, anhedonia, anorexia, depression, etc.) termed sickness behavior. Stressors have been shown to interact with and alter neuroinflammatory responses and associated behaviors...
2018: PloS One
https://www.readbyqxmd.com/read/29302691/amelioration-of-endotoxin-induced-inflammatory-toxic-response-by-a-metal-chelator-in-rat-eyes
#10
Mohammad Shoeb, Min Zhang, Tianlin Xiao, Misha F Syed, Naseem H Ansari
Purpose: Metal ions play a key role in exacerbating toxicity associated with oxidative stress and inflammation. This study examines the effects of a formulation containing the metal chelator ethylenediaminetetraacetic acid (EDTA) and permeability enhancer methyl sulfonyl methane (MSM) on the early course of inflammation in endotoxin-induced uveitis (EIU). The proprietary MSM/EDTA formulation of Livionex, Inc., which was used for this study, is covered by several patents and pending patent applications...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29295869/macrophage-activation-marker-scd163-correlates-with-accelerated-lipolysis-following-lps-exposure-a-human-randomised-clinical-trial
#11
Nikolaj Rittig, Mads Svart, Niels Jessen, Niels Møller, Holger J Møller, Henning Grønbæk
BACKGROUND: Macrophage activation determined by levels of soluble sCD163 is associated with obesity, insulin resistance, diabetes mellitus type 2 (DM2) and non-alcoholic fatty liver disease (NAFLD). This suggests that macrophage activation is involved in the pathogenesis of conditions is characterised by adaptions in the lipid metabolism. Since sCD163 is shed to serum by inflammatory signals including lipopolysaccharides (LPS, endotoxin), we investigated sCD163 and correlations with lipid metabolism following LPS exposure...
January 2018: Endocrine Connections
https://www.readbyqxmd.com/read/29291071/anti-inflammatory-activity-of-electron-deficient-organometallics
#12
Jingwen Zhang, Anaïs Pitto-Barry, Lijun Shang, Nicolas P E Barry
We report an evaluation of the cytotoxicity of a series of electron-deficient (16-electron) half-sandwich precious metal complexes of ruthenium, osmium and iridium ([Os/Ru(η6-p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)] (1/2), [Ir(η5-pentamethylcyclopentadiene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)] (3), [Os/Ru(η6-p-cymene)(benzene-1,2-dithiolato)] (4/5) and [Ir(η5-pentamethylcyclopentadiene)(benzene-1,2-dithiolato)] (6)) towards RAW 264.7 murine macrophages and MRC-5 fibroblast cells...
November 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29282543/characterization-of-bactericidal-efficiency-cell-selectivity-and-mechanism-of-short-interspecific-hybrid-peptides
#13
N Dong, X R Li, X Y Xu, Y F Lv, Z Y Li, A S Shan, J L Wang
Facing rising global antibiotics resistance, physical membrane-damaging antimicrobial peptides (AMPs) represent promising antimicrobial agents. Various strategies to design effective hybrid peptides offer many advantages in overcoming the adverse effects of natural AMPs. In this study, hybrid peptides from different species were investigated, and three hybrid antimicrobial peptides, LI, LN, and LC, were designed by combining the typical fragment of human cathelicidin-derived LL37 with either indolicidin, pig nematode cecropin P1 (CP-1) or rat neutrophil peptide-1 (NP-1)...
December 27, 2017: Amino Acids
https://www.readbyqxmd.com/read/29275013/reduced-release-of-tnf%C3%AE-and-ip-10-after-ex-vivo-blood-stimulation-with-endotoxin-is-associated-with-poor-outcome-after-stroke
#14
Elzbieta Klimiec, Katarzyna Kowalska, Paulina Pasinska, Joanna Pera, Agnieszka Slowik, Tomasz Dziedzic
BACKGROUND AND AIMS: The immune response to acute cerebral ischemia plays an important role in the pathophysiology of stroke and could be a therapeutic target. Toll-like receptor 4 (TLR4) is a master regulator of innate immunity. The aim of our study was to determine the association between selected cytokine release after TLR4 activation in blood cells and the outcome after ischemic stroke. METHODS: We included 156 ischemic stroke patients (median age: 69; 40.4% female)...
December 21, 2017: Cytokine
https://www.readbyqxmd.com/read/29274431/trajectory-of-inflammatory-and-microglial-activation-markers-in-the-postnatal-rabbit-brain-following-intrauterine-endotoxin-exposure
#15
Zhi Zhang, Amar Jyoti, Bindu Balakrishnan, Monica Williams, Sarabdeep Singh, Diane C Chugani, Sujatha Kannan
BACKGROUND: Maternal infection is a risk factor for periventricular leukomalacia and cerebral palsy (CP) in neonates. We have previously demonstrated hypomyelination and motor deficits in newborn rabbits, as seen in patients with cerebral palsy, following maternal intrauterine endotoxin administration. This was associated with increased microglial activation, primarily involving the periventricular region (PVR). In this study we hypothesized that maternal intrauterine inflammation leads to a pro-inflammatory environment in the PVR that is associated with microglial activation in the first 2 postnatal weeks...
December 20, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/29258200/biophysical-analysis-of-lipopolysaccharide-formulations-for-an-understanding-of-the-low-endotoxin-recovery-ler-phenomenon
#16
Wilmar Correa, Klaus Brandenburg, Ulrich Zähringer, Kishore Ravuri, Tarik Khan, Friedrich von Wintzingerode
Lipopolysaccharides (LPS, endotoxin) are complex and indispensable components of the outer membrane of most Gram-negative bacteria. They represent stimuli for many biological effects with pathophysiological character. Recombinant therapeutic proteins that are manufactured using biotechnological processes are prone to LPS contaminations due to their ubiquitous occurrence. The maximum endotoxin load of recombinant therapeutic proteins must be below the pyrogenic threshold. Certain matrices that are commonly used for recombinant therapeutic proteins show a phenomenon called "Low Endotoxin Recovery (LER)"...
December 16, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29242228/bmscs-ameliorate-septic-coagulopathy-through-suppressing-inflammation-in-cecal-ligation-and-puncture-induced-sepsis
#17
Shunyao Xu, Zhen Zhou, Hao Li, Ziying Liu, Xiaojun Pan, Fen Wang, Yueyue Huang, Xiaogang Li, Yunbei Xiao, Jingye Pan, Cong Wang, Dequan Li
Sepsis is an aggressive and life-threatening systemic inflammatory response with a high mortality. Inflammation and coagulation play crucial roles in the pathogenesis of sepsis in a mutually promoting manner. Unlike other single-target molecular therapies that have no obvious effects on clinical sepsis, the bone marrow stromal cell (BMSC) therapy offers a broader spectrum of activities ranging from immune and inflammation suppression to tissue regeneration. In this report, we demonstrated that BMSC injection attenuated the septic coagulopathy...
December 14, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/29240916/study-on-the-anti-endotoxin-effect-of-sinomenine-using-an-agilent-genome-array
#18
Yiyi Hu, Bin Li, Libin Wen, Kongwang He
Background: Endotoxin is a significant contributing factor underlying the occurrence of fever, diarrhea, inflammation, edema, coagulation, shock, and other syndromes associated with Gram-negative bacterial infections. To date, there is no effective treatment for endotoxemia. Aim: The aim of this study was to characterize differentially expressed genes in sinomenine-treated and LPS-induced endothelial cells by microarray analysis, and to determine the potential pharmacological activity of sinomenine...
December 12, 2017: QJM: Monthly Journal of the Association of Physicians
https://www.readbyqxmd.com/read/29226955/stem-cells-rescue-cardiomyopathy-induced-by-p-gingivalis-lps-via-mir-181b
#19
Tung-Sheng Chen, Sarnai Battsengel, Chia-Hua Kuo, Lung-Fa Pan, Yueh-Min Lin, Chun-Hsu Yao, Yueh-Sheng Chen, Feng-Huei Lin, Wei-Wen Kuo, Chih-Yang Huang
Systemic inflammation induced by bacterial infection is one of several causative agents for cardiovascular disorders in patients with periodontal disease. Experimental results indicate that miRNAs play important roles in systemic inflammation induced by endotoxins. Further evidence states that stem cell based therapy shows potential in the treatment of inflammatory responses induced by sepsis. This study investigates if stem cells show protective effects on cardiomyocyte damage induced by porphyromonas gingivalis-LPS (Pg-LPS) through regulating miRNAs...
December 11, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29210120/endogenous-peripheral-hydrogen-sulfide-is-propyretic-its-permissive-role-in-brown-adipose-tissue-thermogenesis-in-rats
#20
Renato N Soriano, Sara P Braga, Jéssica S C Breder, Marcelo E Batalhao, Gabriela R Oliveira-Pelegrin, Luiz Fernando R Ferreira, Maria José A Rocha, Evelin C Carnio, Luiz G S Branco
In recent years hydrogen sulfide (H2 S) has been reported as a gaseous modulator acting in several tissues in health and disease. In systemic inflammation animal models, plasma H2 S concentration increases in response to endotoxin (bacterial lipopolysaccharide, LPS). The most striking response in the acute phase reaction of systemic inflammation is fever, but reports of the peripheral action of H2 S on this thermoregulatory response are not found. We aimed at investigating whether endogenous systemic H2 S modulates LPS-induced fever...
December 6, 2017: Experimental Physiology
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