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Endotoxin, LPS

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https://www.readbyqxmd.com/read/28317862/biological-activity-of-masked-endotoxin
#1
Harald Schwarz, Jan Gornicec, Theresa Neuper, Maria Alejandra Parigiani, Michael Wallner, Albert Duschl, Jutta Horejs-Hoeck
Low endotoxin recovery (LER) is a recently discovered phenomenon describing the inability of limulus amebocyte lysate (LAL)-based assays to detect lipopolysaccharide (LPS) because of a "masking effect" caused by chelators or detergents commonly used in buffer formulations for medical products and recombinant proteins. This study investigates the masking capacities of different buffer formulations and whether masked endotoxin is biologically active. We show that both naturally occurring endotoxin as well as control standard endotoxin can be affected by LER...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28294970/krill-oil-in-water-emulsion-protects-against-lipopolysaccharide-induced-proinflammatory-activation-of-macrophages-in-vitro
#2
Gabriel A Bonaterra, David Driscoll, Hans Schwarzbach, Ralf Kinscherf
BACKGROUND: Parenteral nutrition is often a mandatory therapeutic strategy for cases of septicemia. Likewise, therapeutic application of anti-oxidants, anti-inflammatory therapy, and endotoxin lowering, by removal or inactivation, might be beneficial to ameliorate the systemic inflammatory response during the acute phases of critical illness. Concerning anti-inflammatory properties in this setting, omega-3 fatty acids of marine origin have been frequently described. This study investigated the anti-inflammatory and LPS-inactivating properties of krill oil (KO)-in-water emulsion in human macrophages in vitro...
March 15, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28289922/curcumin-inhibits-lipopolysaccharide-lps-induced-endotoxemia-and-airway-inflammation-through-modulation-of-sequential-release-of-inflammatory-mediators-tnf-%C3%AE-and-tgf-%C3%AE-1-in-murine-model
#3
Asha Kumari, D Dash, Rashmi Singh
OBJECTIVE: Curcumin (diferuloylmethane), a major component of turmeric is well known for its anti-inflammatory potential. Present study investigates sequential release of inflammatory mediators post LPS challenge (10 mg/kg,i.p.) causing lung inflammation and its modulation by curcumin through different routes (20 mg/kg, i.p and 10 mg/kg, i.n.) in murine model. Dexamethasone (1 mg/kg, i.p) was used as standard drug. METHODS: Lung Inflammation was evaluated by histopathological analysis, myeloperoxidase (MPO) activity followed by inflammatory cell count and total protein content measurements in bronchoalveolar fluid (BALF)...
March 13, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28288781/role-of-%C3%AE-naphthylalanine-end-tags-in-the-enhancement-of-antiendotoxin-activities-solution-structure-of-the-antimicrobial-peptide-s1-nal-nal-in-complex-with-lipopolysaccharide
#4
Hui-Yuan Yu, Yi-An Chen, Bak-Sau Yip, Siou-Ying Wang, Hsiu-Ju Wei, Ya-Han Chih, Kuan-Hao Chen, Jya-Wei Cheng
Lipopolysaccharide (LPS, endotoxin) is the major component of Gram-negative bacterial outer surface membrane. LPS released from bacteria into bloodstream during infection may cause serious unwanted stimulation of host's immune system and lead to septic shock of the patient. Recently, we have developed a strategy to increase salt resistance and LPS neutralization of short antimicrobial peptides by adding β-naphthylalanine end-tags to their termini. Herein, correlations between membrane immersion depth, orientation, and antiendotoxin activities of the antimicrobial peptides S1 and S1-Nal-Nal have been investigated via solution structure, paramagnetic resonance enhancement, and saturation transfer difference NMR studies...
March 10, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28284063/soybean-polar-lipids-differently-impact-adipose-tissue-inflammation-and-the-endotoxin-transporters-lbp-and-scd14-in-flaxseed-vs-palm-oil-rich-diets
#5
Manon Lecomte, Leslie Couëdelo, Emmanuelle Meugnier, Emmanuelle Loizon, Pascale Plaisancié, Annie Durand, Alain Géloën, Florent Joffre, Carole Vaysse, Marie-Caroline Michalski, Fabienne Laugerette
Obesity and type 2 diabetes are nutritional pathologies, characterized by a subclinical inflammatory state. Endotoxins are now well recognized as an important factor implicated in the onset and maintain of this inflammatory state during fat digestion in high-fat diet. As a preventive strategy, lipid formulation could be optimized to limit these phenomena, notably regarding fatty acid profile and PL emulsifier content. Little is known about soybean polar lipid (SPL) consumption associated to oils rich in saturated FA vs...
February 21, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28282895/low-dose-endotoxin-induces-late-preconditioning-increases-peroxynitrite-formation-and-activates-stat3-in-the-rat-heart
#6
Márton Pipicz, Gabriella F Kocsis, László Sárváry-Arantes, Péter Bencsik, Zoltán V Varga, Péter Ferdinandy, Tamás Csont
Administration of low-dose endotoxin (lipopolysaccharide, LPS) 24 h before a lethal ischemia induces pharmacological late preconditioning. The exact mechanism of this phenomenon is not clear. Here we aimed to investigate whether low-dose LPS exerts late effects on peroxynitrite formation and activation of Akt, Erk, and STAT3 in the heart. Male Wistar rats were injected with LPS (S. typhimurium; 0.5 mg/kg i.p.) or saline. Twenty-four hours later, hearts were isolated, perfused for 10 min, and then used for biochemical analyses...
March 8, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28275139/the-cytokine-response-to-lipopolysaccharide-does-not-predict-the-host-response-to-infection
#7
Benjamin A Fensterheim, Yin Guo, Edward R Sherwood, Julia K Bohannon
The magnitude of the LPS-elicited cytokine response is commonly used to assess immune function in critically ill patients. A suppressed response, known as endotoxin tolerance, is associated with worse outcomes, yet endotoxin tolerance-inducing TLR4 ligands are known to protect animals from infection. Thus, it remains unknown whether the magnitude of the LPS-elicited cytokine response provides an accurate assessment of antimicrobial immunity. To address this, the ability of diverse TLR ligands to modify the LPS-elicited cytokine response and resistance to infection were assessed...
March 8, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28263828/6-hydroxy-5-7-dimethoxy-flavone-suppresses-the-neutrophil-respiratory-burst-via-selective-pde4-inhibition-to-ameliorate-acute-lung-injury
#8
Yung-Fong Tsai, Tzu-Chi Chu, Wen-Yi Chang, Yang-Chang Wu, Fang-Rong Chang, Shun-Chin Yang, Tung-Ying Wu, Yu-Ming Hsu, Chun-Yu Chen, Shih-Hsin Chang, Tsong-Long Hwang
Over-activated neutrophils produce enormous oxidative stress and play a key role in the development of acute and chronic inflammatory diseases. 6-Hydroxy-5,7-dimethoxy-flavone (UFM24), a flavone isolated from the Annonaceae Uvaria flexuosa, showed inhibitory effects on human neutrophil activation and salutary effects on lipopolysaccharide (LPS)-induced acute lung injury (ALI) in mice. UFM24 potently inhibited superoxide anion (O2(•-)) generation, reactive oxidants, and CD11b expression, but not elastase release, in N-formyl-l-methionyl-l-leucyl-l-phenylalanine (fMLF)-activated human neutrophils...
March 3, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28258715/human-macrophages-chronically-exposed-to-lps-can-be-reactivated-by-stimulation-with-mdp-to-acquire-an-antimicrobial-phenotype
#9
Silvia Guzmán-Beltrán, Martha Torres, Monserrat Arellano, Esmeralda Juárez
Macrophages are important in host defense and can differentiate into functionally distinct subsets named classically (M1) or alternatively (M2) activated. In several inflammatory disorders, macrophages become tolerized to prevent deleterious consequences. This tolerization reduces the ability of macrophages to respond to bacterial components (e.g., LPS) maintaining a low level of inflammation but compromising the ability of macrophages to mount an effective immune response during subsequent pathogen encounters...
February 21, 2017: Cellular Immunology
https://www.readbyqxmd.com/read/28257834/anxa1ac2-26-peptide-a-possible-therapeutic-approach-in-inflammatory-ocular-diseases
#10
Laila Toniol Cardin, Nathália Martins Sonehara, Kallyne Kioko Oliveira Mimura, Anemari Ramos Dinarte Dos Santos, Wilson Araújo da Silva, Lays Martin Sobral, Andréia Machado Leopoldino, Bianca Rodrigues da Cunha, Eloiza H Tajara, Sonia Maria Oliani, Flávia Cristina Rodrigues-Lisoni
The eye is immunologically privileged when inflammatory responses are suppressed. One component responsible for the suppression of inflammatory responses is the blood retinal barrier, which comprises the retinal pigment epithelium. The destruction of this barrier initiates inflammation, which can affect any part of the eye. Therefore, inflammatory response is controlled by the action of anti-inflammatory mediators, among these mediators, annexin A1 (ANXA1) protein acts as a modulator of inflammation. In this study we aimed to improve the knowledge of this area by investigating how a peptide of the ANXA1 protein (ANXA1Ac2-26) modulates the morphology, proliferation, migration and expression of genes and proteins in human retinal pigment epithelium cells (ARPE-19)...
February 28, 2017: Gene
https://www.readbyqxmd.com/read/28256612/the-role-of-indoleamine-2-3-dioxygenase-aryl-hydrocarbon-receptor-pathway-in-the-tlr4-induced-tolerogenic-phenotype-in-human-dcs
#11
Fabián Salazar, Dennis Awuah, Ola H Negm, Farouk Shakib, Amir M Ghaemmaghami
A controlled inflammatory response is required for protection against infection, but persistent inflammation causes tissue damage. Dendritic cells (DCs) have a unique capacity to promote both inflammatory and anti-inflammatory processes. One key mechanism involved in DC-mediated immunosuppression is the expression of tryptophan-metabolizing enzyme indoleamine 2,3-dioxygenase (IDO). IDO has been implicated in diverse processes in health and disease but its role in endotoxin tolerance in human DCs is still controversial...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28255158/altered-intestinal-microbiota-in-patients-with-chronic-pancreatitis-implications-in-diabetes-and-metabolic-abnormalities
#12
Sai Manasa Jandhyala, A Madhulika, G Deepika, G Venkat Rao, D Nageshwar Reddy, Chivukula Subramanyam, Mitnala Sasikala, Rupjyoti Talukdar
Intestinal dysbiosis and its functional implications in chronic pancreatitis (CP) have not been elaborately studied. We evaluated the taxonomic and functional alterations in intestinal microbiota in 30 well-characterised patients with CP (16 without, 14 with diabetes) and 10 healthy controls. The patients with CP and diabetes had significantly longer disease duration and greater degree of malnutrition. There was increase in plasma endotoxin concentrations from controls to CP non-diabetics to CP diabetics. We observed significant differences in richness and alpha diversity between the groups...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28254553/chronic-unpredictable-stress-abrogates-the-endotoxin-tolerance-induced-by-repeated-peripheral-lps-challenge-via-the-tlr4-signaling-pathway
#13
Jingyi Yan, Jianing Bai, Chen Gao, Yanling Liang, Baohua Zhao, Yanqing Bian
Endotoxin tolerance is induced by exposure to a repeated LPS challenge. Stress can exacerbate LPS-induced inflammation in the mouse hippocampus. However, the effects of stress on endotoxin tolerance have not been elucidated. The present experiments were designed to assess whether tolerance could be induced in the hippocampus by intraperitoneal injection of LPS at a dose of 250μg/kg for 7days, to investigate the effects of chronic unpredictable stress (CUS) on LPS-induced tolerance, and to assess underlying mechanisms in male Kunming mice...
February 28, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28245450/intrahypophyseal-immune-endocrine-interactions-endocrine-integration-of-the-inflammatory-inputs
#14
U Renner, M Sapochnik, K Lucia, G K Stalla, E Arzt
Endotoxin (lipopolysaccharide, LPS) of gram-negative bacteria has been recognized for more than 40 years as a modulator of anterior pituitary hormone production. The action of LPS was thought to be predominantly mediated through LPS-stimulated immune cell-derived cytokines, and is part of the concept of immune-endocrine crosstalk, which regulates bidirectional adaptive processes between the endocrine and immune systems during inflammatory or infectious processes. With the detection of innate immune system components in the normal and tumoral pituitary, including the Toll-like receptor 4, the target of LPS, it has become evident that LPS can directly modify the physiology and pathophysiology of the anterior pituitary...
2017: Frontiers of Hormone Research
https://www.readbyqxmd.com/read/28238753/glucocorticoid-induced-leucine-zipper-overexpression-inhibits-lipopolysaccharide-induced-retinal-inflammation-in-rats
#15
Ruiping Gu, Boya Lei, Qinmeng Shu, Gang Li, Gezhi Xu
Glucocorticoid-induced leucine zipper (GILZ) mediates several effects of glucocorticoids and has important anti-inflammatory properties. Here, we explored the role of GILZ in inhibiting retinal inflammation. Endotoxin-induced uveitis (EIU) was established in rats by intravitreal injection of lipopolysaccharide (LPS). GILZ levels decreased in the EIU retina at 4 h after LPS injection and slowly recovered within 24 h. Retinal GILZ was downregulated by recombinant lentivirus-delivered short-hairpin RNA targeting GILZ (shRNA-GILZ-rLV) and upregulated by recombinant lentivirus-mediated GILZ overexpression (Oe-GILZ-rLV)...
February 24, 2017: Experimental Eye Research
https://www.readbyqxmd.com/read/28237630/-18-f-fluoro-2-deoxyglucose-pet-informs-neutrophil-accumulation-and-activation-in-lipopolysaccharide-induced-acute-lung-injury
#16
Rosana S Rodrigues, Fernando A Bozza, Christopher J Hanrahan, Li-Ming Wang, Qi Wu, John M Hoffman, Guy A Zimmerman, Kathryn A Morton
INTRODUCTION: Molecular imaging of the earliest events related to the development of acute lung injury (ALI)/acute respiratory distress syndrome (ARDS) could facilitate therapeutic development and patient management. We previously reported that (18)F-fluoro-2-deoxyglucose ((18)F-FDG) PET identifies ALI/ARDS prior to radiographic abnormalities. The purpose of this study was to establish the time courses of (18)F-FDG uptake, edema and neutrophil recruitment in an endotoxin-induced acute lung injury model and to examine molecular events required for (14)C-2DG uptake in activated neutrophils...
January 17, 2017: Nuclear Medicine and Biology
https://www.readbyqxmd.com/read/28225890/the-anesthetic-agent-sevoflurane-attenuates-pulmonary-acute-lung-injury-by-modulating-apoptotic-pathways
#17
L Wang, Y Ye, H B Su, J P Yang
The objective of this study was to evaluate lung protection by the volatile anesthetic sevoflurane (SEVO), which inhibits apoptosis. Male Sprague-Dawley rats (250-280 g; n=18) were randomly divided into three groups. The LPS group received 5 mg/kg endotoxin (lipopolysaccharide), which induced acute lung injury (ALI). The control (CTRL) group received normal saline and the SEVO group received sevoflurane (2.5%) for 30 min after ALI was induced by 5 mg/kg LPS. Samples were collected for analysis 12 h after LPS...
February 20, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28216979/association-between-endotoxemia-and-histological-features-of-nonalcoholic-fatty-liver-disease
#18
Hiroyuki Kitabatake, Naoki Tanaka, Naoyuki Fujimori, Michiharu Komatsu, Ayaka Okubo, Kyogo Kakegawa, Takefumi Kimura, Ayumi Sugiura, Tomoo Yamazaki, Soichiro Shibata, Yuki Ichikawa, Satoru Joshita, Takeji Umemura, Akihiro Matsumoto, Masayoshi Koinuma, Kenji Sano, Toshifumi Aoyama, Eiji Tanaka
AIM: To assess whether surrogate biomarkers of endotoxemia were correlated with the histological features of nonalcoholic fatty liver disease (NAFLD). METHODS: One hundred twenty-six NAFLD patients who had undergone percutaneous liver biopsy were enrolled. Serum lipopolysaccharide (LPS)-binding protein (LBP) and anti-endotoxin core immunoglobulin G (EndoCab IgG) antibody concentrations at the time of liver biopsy were measured using the enzyme-linked immunosorbent assays to examine for relationships between biomarker levels and histological scores...
January 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28212583/role-of-topk-in-lipopolysaccharide-induced-breast-cancer-cell-migration-and-invasion
#19
Min-Ah Seol, Jung-Hwan Park, Ji Heun Jeong, Jungmook Lyu, Seung Yun Han, Sang-Muk Oh
Inflammation has been known to be linked to invasion or metastasis of breast cancer, which has poor prognosis, although the regulatory mechanism remains to be undiscovered. Here we show that T-LAK cell-originated protein kinase (TOPK) mediates pro-inflammatory endotoxin lipopolysaccharide (LPS)-induced breast cancer cell migration and invasion. The mRNA or protein level of TOPK, toll- like receptor4 (TLR4), interleukin (IL)-6, vascular endothelial growth factor (VEGF) or matrix metalloproteinase9 (MMP9) genes related to TLR4 signaling or tumor progression was induced by LPS treatment in MCF7 breast cancer cells, but the induction was abolished by stable knocking down of TOPK in MCF7 cells...
February 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28205451/sialylation-of-porphyromonas-gingivalis-lps-and-its-effect-on-bacterial-host-interactions
#20
Svetislav S Zaric, Mark J Lappin, Catherine R Fulton, Fionnuala T Lundy, Wilson A Coulter, Christopher R Irwin
Porphyromonas gingivalis produces different LPS isoforms with significant structural variations of their lipid A and O-antigen moieties that can affect its pro-inflammatory and bone-resorbing potential. We show here, for the first time, that P. gingivalis LPS isolated from W83 strain is highly sialylated and possesses significantly reduced inflammatory potential compared with less sialylated ATCC 33277 strain LPS. Nevertheless, the reduction in the endotoxin activity is not mediated by the presence of sialic acid LPS moieties as the sialic acid-free LPS produced by the mutant W83 strain exhibits a similar inflammatory potential to the wild type strain...
January 1, 2017: Innate Immunity
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