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endotoxin tolerance

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https://www.readbyqxmd.com/read/27913794/tlr-ligands-but-not-modulators-of-histone-modifiers-can-induce-the-complex-immune-response-pattern-of-endotoxin-tolerance-in-mammary-epithelial-cells
#1
Juliane Günther, Wolfram Petzl, Holm Zerbe, Hans-Joachim Schuberth, Hans-Martin Seyfert
Excessive stimulation of the TLR4 axis through LPS reduces the expression of some cytokine genes in immune cells, while stimulating the expression of immune defense genes during a subsequent bacterial infection. This endotoxin tolerance (ET) is mediated via epigenetic mechanisms. Priming the udder of cows with LPS was shown to induce ET in mammary epithelial cells (MEC), thereby protecting the udder against reinfection for some time. Seeking alternatives to LPS priming we tried to elicit ET by priming MEC with either lipopeptide (Pam2CSK4) via the TLR2/6 axis or inhibitors of histone-modifying enzymes...
December 1, 2016: Innate Immunity
https://www.readbyqxmd.com/read/27888109/ephestia-kuehniella-tolerance-to-bacillus-thuringiensis-cry1aa-is-associated-with-reduced-oligomer-formation
#2
Maissa Chakroun, Sameh Sellami, Juan Ferré, Slim Tounsi, Souad Rouis
The basis of the different susceptibility of Ephestia kuehniella to the Cry1Aa and Cry1Ac δ-endotoxins from Bacillus thuringiensis kurstaki BNS3 was studied. Both toxins bound specifically to the BBMV of E. kuehniella. The result of the ligand blot showed that Cry1Ac bound to three putative receptors of about 100, 65 and 80 kDa and Cry1Aa interacted only with a 100 kDa protein. Pronase digestion of the BBMV-bound toxins was used to analyze the toxin insertion. Both toxins inserted into the BBMV as monomers however, a 14 kDa peptide of α4-α5 which correspond to the oligomeric form of this peptide was detected in case of Cry1Ac only...
November 22, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27868366/effects-of-gemigliptin-a-dipeptidyl-peptidase-4-inhibitor-on-lipid-metabolism-and-endotoxemia-after-a-high-fat-meal-in-patients-with-type-2-diabetes
#3
Chang Ho Ahn, Eun Ky Kim, Se Hee Min, Tae Jung Oh, Young Min Cho
We aimed to investigate the effects of gemigliptin, a dipeptidyl peptidase-4 inhibitor, on postprandial lipoprotein levels and endotoxemia. This was a randomized, double-blind, placebo-controlled, crossover study. Ten patients with type 2 diabetes mellitus (T2DM) inadequately controlled with oral anti-diabetic medications and/or lifestyle modification were randomized to gemigliptin or placebo for four weeks. At the end of each treatment phase, the subjects underwent a high-fat meal tolerance test and needle aspiration of abdominal subcutaneous adipose tissue...
November 21, 2016: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/27859049/lps-primed-heterotolerant-dendritic-cells-suppress-experimental-autoimmune-uveoretintitis-by-multiple-mechanisms
#4
Izabela P Klaska, Elizabeth Muckersie, Cristina Martin-Granados, Maria Christofi, John V Forrester
Exposure of bone marrow derived dendritic cells (BMDC) to high dose ultrapure lipopolysaccharide for 24 hours (h) (LPS-primed BMDC) enhances their potency in preventing inter-photoreceptor retinoid binding protein (IRBP): complete Freund's adjuvant (CFA)-induced experimental autoimmune uveoretinitis (EAU). LPS-primed BMDC are refractory to further exposure to LPS (= endotoxin tolerance, ET), evidenced here by decreased phosphorylation of TANK-binding kinase 1 (TBK1), interferon regulatory factor 3 (IRF3), c-Jun N-terminal kinase (JNK), and p38 mitogen-activated protein kinase (p38 MAPK) as well as impaired nuclear translocation of nuclear factor κB (NF-κB) and IRF3, resulting in reduced tumor necrosis factor alpha (TNF-α), interleukin (IL)-6, IL-12 and interferon beta (IFN-β) secretion...
November 15, 2016: Immunology
https://www.readbyqxmd.com/read/27849678/fc-gamma-receptor-iib-deficient-mice-a-lupus-model-with-increased-endotoxin-tolerance-related-sepsis-susceptibility
#5
Thunnicha Ondee, Saowapha Surawut, Sujittra Taratummarat, Nattiya Hirankan, Tanapat Palaga, Prapaporn Pisitkun, Trairak Pisitkun, Asada Leelahavanichkul
Hyper-elevated immune response of FcGRIIb-/- mice, a lupus model with an inhibitory-signaling defect, can become exhausted (less subsequent immune-response than the first response) with sequential LPS stimulation. Endotoxin tolerance-related modifications of inflammatory response were investigated in FcGRIIb-/- mice in both an in vivo sepsis model and in vitro using cultured macrophages. Serum cytokine concentrations, after the second LPS injection (at 5-fold higher levels than the first dose) did not exceed the first dose levels in either FcGRIIb-/- or wild-type mice...
November 15, 2016: Shock
https://www.readbyqxmd.com/read/27809752/dok3-degradation-is-required-for-the-development-of-lps-induced-ards-in-mice
#6
Ning Liu, Xiaofeng Liu, Xiaoou Li, Kaifang Duan, Yuming Deng, Xiuyan Yu, Qisheng Peng
It has been reported that DOK3 protein negatively regulates LPS responses and endotoxin tolerance in mice. However, the role of DOK3 in the development of acute respiratory distress syndrome (ARDS) remains unknown. In this study, we showed that DOK3 is degraded in the lung tissues of LPS-induced ARDS. Through lentivirus infection containing DOK3(K27R) via the intranasal route, we created a mice model, in which DOK3 maintains stable expression. We found that the forced DOK3 expression significantly attenuated LPS-induced pulmonary histological alterations, inflammatory cells infiltration, lung edema, as well as the generation of inflammatory cytokines TNFα, IL-1βand IL-6 in BALF of LPS-induced ARDS mice...
November 3, 2016: Current Gene Therapy
https://www.readbyqxmd.com/read/27780729/looped-limulus-anti-lipopolysaccharide-derived-peptide-clp-19-induces-endotoxin-tolerance-involved-inhibition-of-nf-%C3%AE%C2%BAb-activation
#7
Ya Yang, Di Li, Zhiqiang Tian, Jun Lv, Fengjun Sun, Qian Wang, Yao Liu, Peiyuan Xia
Endotoxin tolerance (ET) is a complex protective mechanism against endotoxin shock. The looped CLP-19 peptide derived from Limulus anti-LPS peptide induced the ET phenomenon but the molecular mechanism has yet to be fully elucidated. Here, we confirmed that CLP-19 attenuated upon LPS stimulated pro-inflammatory factor secretion of TNF-α and IL-6 but increased anti-inflammatory factor production of IL-10 in dose- and time-dependent manners. CLP-19 also inhibited subsequent LPS stimulated expression of TLR4 on the cell membrane...
October 22, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27734806/increased-sample-asymmetry-and-memory-of-cardiac-time-series-following-endotoxin-administration-in-cirrhotic-rats
#8
Mina Taghipour, Golnar Eftekhari, Zahra Haddadian, Roham Mazloom, Mohammad Mani, Ali R Mani
Sepsis, and other causes of acute systemic inflammation, can reduce heart rate variability (HRV) and increase cardiac cycle regularity in mammals. Thus, HRV monitoring has been used for early detection of sepsis in adults and neonates. Liver cirrhosis is associated with reduced basal HRV and the development of tolerance to the cardiac chronotropic effects of bacterial endotoxin. This may pose limitations on the use of heart rate monitoring in early detection of sepsis in this patient population. In a study to develop a physiomarker for the detection of sepsis in cirrhosis, we observed that endotoxin administration in adult cirrhotic rats leads to the development of transient heart rate decelerations, a phenomenon which has been reported in neonates with sepsis, and quantified using sample asymmetry analysis...
October 13, 2016: Physiological Measurement
https://www.readbyqxmd.com/read/27708538/preconditioning-by-low-dose-lps-prevents-subsequent-lps-induced-severe-liver-injury-via-nrf2-activation-in-mice
#9
Masato Nakasone, Kazuhiro Nakaso, Yosuke Horikoshi, Takehiko Hanaki, Yoshinori Kitagawa, Toru Takahashi, Yoshimi Inagaki, Tatsuya Matsura
BACKGROUND: Sepsis is a syndrome triggered by endotoxin lipopolysaccharide (LPS) during bacterial infection. Sepsis sometimes recurs, with the second sepsis giving rise to a different phenotype because of disease modification by the preceding sepsis. Such a protective modification is called a preconditioning (PC) effect. PC is an endogenous protective mechanism by which sublethal damage confers tolerance to a subsequent lethal load. Oxidative stress is one of the important pathogenetic mechanisms that occur in sepsis...
September 2016: Yonago Acta Medica
https://www.readbyqxmd.com/read/27631207/effects-of-bovine-colostrum-on-recurrent-respiratory-tract-infections-and-diarrhea-in-children
#10
Khaled Saad, Mohamed Gamil M Abo-Elela, Khaled A Abd El-Baseer, Ahmed E Ahmed, Faisal-Alkhateeb Ahmad, Mostafa S K Tawfeek, Amira A El-Houfey, Mohamed Diab AboulKhair, Ahmad M Abdel-Salam, Amir Abo-Elgheit, Heba Qubaisy, Ahmed M Ali, Eman Abdel-Mawgoud
BACKGROUND: Bovine colostrum (BC) has direct antimicrobial and endotoxin-neutralizing effects throughout the alimentary tract, as well as other bioactivities that suppress gut inflammation and promote mucosal integrity and tissue repair under various conditions related to tissue injury. The precise role of BC in respiratory and gastrointestinal (GI) infections in children is not well defined. The aim of this study was to evaluate the efficacy and tolerability of BC administration in preventing recurrent upper respiratory tract infections (URTI) and diarrhea in children...
September 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27628304/phospholipid-flippases-attenuate-lps-induced-tlr4-signaling-by-mediating-endocytic-retrieval-of-toll-like-receptor-4
#11
Vincent A van der Mark, Mohammed Ghiboub, Casper Marsman, Jing Zhao, Remco van Dijk, Johan K Hiralall, Kam S Ho-Mok, Zoë Castricum, Wouter J de Jonge, Ronald P J Oude Elferink, Coen C Paulusma
P4-ATPases are lipid flippases that catalyze the transport of phospholipids to create membrane phospholipid asymmetry and to initiate the biogenesis of transport vesicles. Here we show, for the first time, that lipid flippases are essential to dampen the inflammatory response and to mediate the endotoxin-induced endocytic retrieval of Toll-like receptor 4 (TLR4) in human macrophages. Depletion of CDC50A, the β-subunit that is crucial for the activity of multiple P4-ATPases, resulted in endotoxin-induced hypersecretion of proinflammatory cytokines, enhanced MAP kinase signaling and constitutive NF-κB activation...
September 14, 2016: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/27625297/splenic-cd11c-low-cd45rb-high-dendritic-cells-derived-from-endotoxin-tolerant-mice-attenuate-experimental-acute-liver-failure
#12
Sai-Nan Zhang, Nai-Bin Yang, Shun-Lan Ni, Jin-Zhong Dong, Chun-Wei Shi, Shan-Shan Li, Sheng-Guo Zhang, Xin-Yue Tang, Ming-Qin Lu
Endotoxin tolerance (ET) is suggested to attenuate the severity of acute liver failure (ALF) in mice, possibly through both innate and adaptive immunity. However, the involvement of regulatory dendritic cells (DCregs) in ET has not been fully elucidated. In this study, their effect on ALF in mice was investigated. Splenic DCregs from ET-exposed mice (ET-DCregs) showed lower expression levels of CD40, CD80, and MHC-II markers and stronger inhibition of allogenic T cells and regulation of IL-10 and IL-12 secretion than splenic DCregs from normal mice (nDCregs)...
September 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27593544/randomised-clinical-trial-the-effects-of-a-multispecies-probiotic-vs-placebo-on-innate-immune-function-bacterial-translocation-and-gut-permeability-in-patients-with-cirrhosis
#13
A Horvath, B Leber, B Schmerboeck, M Tawdrous, G Zettel, A Hartl, T Madl, S Stryeck, D Fuchs, S Lemesch, P Douschan, E Krones, W Spindelboeck, F Durchschein, F Rainer, G Zollner, R E Stauber, P Fickert, P Stiegler, V Stadlbauer
BACKGROUND: Probiotics may correct intestinal dysbiosis and proinflammatory conditions in patients with liver cirrhosis. AIM: To test the effects of a multispecies probiotic on innate immune function, bacterial translocation and gut permeability. METHODS: In a randomised, double blind, placebo-controlled study, stable cirrhotic out-patients either received a daily dose of a probiotic powder containing eight different bacterial strains (Ecologic Barrier, Winclove, Amsterdam, The Netherlands) (n = 44) or a placebo (n = 36) for 6 months and were followed up for another 6 months...
November 2016: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27536946/effects-of-porphyromonas-gingivalis-lipopolysaccharidetolerized-monocytes-on-inflammatory-responses-in-neutrophils
#14
Xiang-Qing Zhu, Wei Lu, Yang Chen, Xiao-Fan Cheng, Jia-Ying Qiu, Yan Xu, Ying Sun
Periodontitis is a chronic inflammatory disease induced by bacteria. Exposure of the host to periodontal pathogens and their virulence factors induces a state of hyporesponsiveness to subsequent stimulations, which is termed endotoxin tolerance. The role and mechanism of lipopolysaccharide (LPS)-tolerized monocytes in inflammatory responses in neutrophils are currently unclear. Here, conditioned supernatants were collected from THP-1 cells treated with or without repeated 1 μg/ml Porphyromonas gingivalis (P...
2016: PloS One
https://www.readbyqxmd.com/read/27530729/effect-of-pioglitazone-on-metabolic-features-in-endotoxemia-model-in-obese-diabetic-db-db-mice
#15
Manoranjan Sharma, Jogeswar Mohapatra, Umar Malik, Jignesh Nagar, Abhijit Chatterjee, Balaraman Ramachandran, Mukul R Jain
BACKGROUND: Infectious diseases are more frequent in diabetic patients, leading to increased morbidity and mortality. Endotoxemia affects glucose metabolism and lipolytic capacity. The aims of the present study were to determine whether endotoxemia exacerbates metabolic features (adipose inflammation, adipogenesis, and insulin resistance [IR]) in an animal model of diabetes (i.e. db/db mice) after acute infection and the effects of pioglitazone. METHODS: Female db/db mice treated with pioglitazone (3 and 30 mg/kg, p...
July 22, 2016: Journal of Diabetes
https://www.readbyqxmd.com/read/27461080/toll-like-receptor-4-mediates-morphine-induced-neuroinflammation-and-tolerance-via-soluble-tumor-necrosis-factor-signaling
#16
Lori N Eidson, Kiyoshi Inoue, Larry J Young, Malu G Tansey, Anne Z Murphy
Opioid tolerance and the potential for addiction is a significant burden associated with pain management, yet its precise underlying mechanism and prevention remain elusive. Immune signaling contributes to the decreased efficacy of opioids, and we recently demonstrated that toll-like receptor 4 (TLR4)-mediated neuroinflammation in the periaqueductal gray (PAG) drives tolerance. Tumor necrosis factor (TNF), a product of TLR4 signaling, promotes inflammation and facilitates glutamatergic signaling, key components of opioid tolerance...
July 27, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27379867/epigenetic-mechanisms-governing-innate-inflammatory-responses
#17
Darren J Perkins, Mira C Patel, Jorge C G Blanco, Stefanie N Vogel
Toll-like receptors (TLRs) are major receptors of the host innate immune system that recognize conserved pathogen-associated molecular patterns (PAMPs) of invading microbes. Activation of TLR signaling culminates in the expression of multiple genes in a coordinate and kinetically defined manner. In this review, we summarize the current studies describing the chromatin landscape of TLR-responsive inflammatory genes and how changes to this chromatin landscape govern cell type-specific and temporal gene expression...
July 2016: Journal of Interferon & Cytokine Research
https://www.readbyqxmd.com/read/27379022/the-role-of-acth-and-corticosteroids-for-sepsis-and-septic-shock-an-update
#18
REVIEW
Djillali Annane
Sepsis is a common disorder associated with high morbidity and mortality. It is now defined as an abnormal host response to infection, resulting in life-threatening dysfunction of organs. There is evidence from in vitro and in vivo experiments in various animal models and in patients that endotoxin or sepsis may directly and indirectly alter the hypothalamic-pituitary-adrenal response to severe infection. These alterations may include necrosis or hemorrhage or inflammatory mediator-mediated decreased ACTH synthesis, steroidogenesis, cortisol delivery to tissues, clearance from plasma, and decreased sensitivity of tissues to cortisol...
2016: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/27377744/endotoxin-tolerance-inhibits-degradation-of-tumor-necrosis-factor-receptor-associated-factor-3-by-suppressing-pellino-1-expression-and-the-k48-ubiquitin-ligase-activity-of-cellular-inhibitor-of-apoptosis-protein-2
#19
Peizhi Li, Hongxiang Liu, Yiyin Zhang, Rui Liao, Kun He, Xiongzhong Ruan, Jianping Gong
Pellino 1 positively regulates Toll-like receptor 4 signaling by regulating tumor necrosis factor receptor-associated factor 3 (TRAF3) degradation and is suppressed with the induction of endotoxin tolerance. However, the role of TRAF3 in endotoxin tolerance is largely unknown. In this study, we found that lipopolysaccharide (LPS) stimulation decreased TARF3 protein expression in mouse Kupffer cells (KCs) and liver tissues, whereas endotoxin tolerization abrogated this effect. Degradative TRAF3 K48-linked ubiquitination and the cytoplasmic translocation of the MYD88-associated multiprotein complex were significantly inhibited in tolerized KCs, which led to markedly impaired activation of MYD88-dependent JNK and p38 and downregulation of inflammatory cytokines...
September 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27227070/insights-into-the-role-of-heat-shock-protein-72-to-whole-body-heat-acclimation-in-humans
#20
REVIEW
Fabiano Trigueiro Amorim, Ivana T Fonseca, Christiano A Machado-Moreira, Flávio de Castro Magalhães
Heat acclimation results in systemic and cellular adaptions that reduce the negative effect of heat and, consequently, the risk of heat illness. Although the classical changes observed with heat acclimation lead to increased tolerance to exercise in the heat by reducing heat storage (reflected in reduced core and skin temperatures) and increasing whole-body capacity for heat dissipation (greater plasma volume, sweat output, and skin blood flow), it appears that heat acclimation also induces changes at the cellular level that might increase tolerance of the whole organism to a higher core temperature for the development of fatigue...
October 2015: Temperature: Multidisciplinary Biomedical Journal
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