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Lipid mediators

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https://www.readbyqxmd.com/read/29240267/acute-oral-dose-of-sodium-nitrite-causes-redox-imbalance-and-dna-damage-in-rat-kidney
#1
Fariheen Aisha Ansari, Shaikh Nisar Ali, Aijaz Ahmed Khan, Riaz Mahmood
Sodium nitrite (NaNO2) is widely used as a food additive and preservative in fish and meat products. We have evaluated the effect of a single acute oral dose of NaNO2 on oxidative stress parameters, antioxidant capacity and DNA in rat kidney. Male Wistar rats were divided into four groups and given single oral dose of NaNO2 at 20, 40, 60 and 75 mg/kg body weight; untreated rats served as the control group. All animals in NaNO2 -treated groups showed marked alterations in various parameters of oxidative stress as compared to the control group...
December 14, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29238967/potent-anti-inflammatory-and-pro-resolving-effects-of-anabasum-in-a-human-model-of-self-resolving-acute-inflammation
#2
Madhur P Motwani, Frances Bennett, Paul C Norris, Alexander A Maini, Marc J George, Justine Newson, Alice Henderson, Adrian J Hobbs, Mark Tepper, Barbara White, Charles N Serhan, Raymond MacAllister, Derek W Gilroy
Anabasum is a synthetic analogue of Δ8 - tetrahydrocannabinol (THC)-11-oic acid that in pre-clinical models of experimental inflammation exerts potent anti-inflammatory actions with minimal CNS cannabimimetic activity. Here we used a novel model of acute inflammation driven by i.d. UV-killed E. coli in healthy humans and found that Anabasum (5mg) exerted a potent anti-inflammatory effect equivalent to that of prednisolone in terms of inhibiting neutrophil infiltration, the hallmark of acute inflammation. These effects arose from the inhibition of the neutrophil chemoattractant LTB4 , while the inhibition of anti-phagocytic prostanoids (PGE2 , TxB2 and PGF2 α) resulted in enhanced clearance of inflammatory stimulus from the injected site...
December 14, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29238536/body-macronutrient-composition-is-predicted-by-lipid-and-not-protein-content-of-the-diet
#3
Joshua P Moatt, Catherine Hambly, Elizabeth Heap, Anna Kramer, Fiona Moon, John R Speakman, Craig A Walling
Diet is an important determinant of fitness-related traits including growth, reproduction, and survival. Recent work has suggested that variation in protein:lipid ratio and particularly the amount of protein in the diet is a key nutritional parameter. However, the traits that mediate the link between dietary macronutrient ratio and fitness-related traits are less well understood. An obvious candidate is body composition, given its well-known link to health. Here, we investigate the relationship between dietary and body macronutrient composition using a first-generation laboratory population of a freshwater fish, the three-spine stickleback (Gasterosteus aculeatus)...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29238016/-imaging-of-bone-and-joint-destruction
#4
Junichi Kikuta, Masaru Ishii
  Osteoclasts are bone-resorbing giant polykaryons that differentiate from mononuclear macrophage/monocyte-lineage hematopoietic precursors. We have originally established an advanced imaging system for visualizing in vivo behavior of osteoclasts and their precursors with intravital two-photon microscopy. By means of the system, we found that sphingosine-1-phosphate, a lipid mediator enriched in blood, controlled the migratory behavior of osteoclast precursors. We also developed pH-sensing chemical fluorescent probes to detect localized acidification by bone-resorbing osteoclasts on the bone surface in vivo, and identified two distinct functional states of differentiated osteoclasts, 'bone-resorptive' and 'non-resorptive'...
2017: Nihon Rinshō Men'eki Gakkai Kaishi, Japanese Journal of Clinical Immunology
https://www.readbyqxmd.com/read/29237779/estrogen-receptor-%C3%AE-signaling-exacerbates-immune-mediated-nephropathies-through-alteration-of-metabolic-activity
#5
Chelsea Corradetti, Neelakshi R Jog, Matteo Cesaroni, Michael Madaio, Roberto Caricchio
Glomerulonephritis is one of the most serious manifestations of systemic lupus erythematous (SLE). Because SLE is ≥10 times more common in women, a role for estrogens in disease pathogenesis has long been suspected. Estrogen receptor α (ERα) is highly expressed in renal tissue. We asked whether ERα expression contributes to the development of immune-mediated nephropathies like in lupus nephritis. We tested the overall effects of estrogen receptors on the immune response by immunization with OVA and induction of chronic graft-versus-host disease in female ERα-knockout mice...
December 13, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29237716/shared-and-distinct-lipid-lipid-interactions-in-plasma-and-affected-tissues-in-a-diabetic-mouse-model
#6
Kelli M Sas, Jiahe Lin, Thekkelnaycke M Rajendiran, Tanu Soni, Viji Nair, Lucy M Hinder, Hosagrahar V Jagadish, Thomas W Gardner, Steven F Abcouwer, Frank C Brosius, Eva L Feldman, Matthias Kretzler, George Michailidis, Subramaniam Pennathur
Lipids are ubiquitous metabolites with diverse functions; abnormalities in lipid metabolism appear related to complications from multiple diseases, including type 2 diabetes. Through technological advances, the entire lipidome has been characterized, and researchers now need computational approaches to better understand lipid network perturbations in different diseases. Using a mouse model of type 2 diabetes with microvascular complications, we examined lipid levels in plasma and in renal, neural, and retinal tissues to identify shared and distinct lipid abnormalities...
December 13, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/29237483/adipocytes-promote-cholangiocarcinoma-metastasis-through-fatty-acid-binding-protein-4
#7
Jihua Nie, Jingying Zhang, Lili Wang, Lunjie Lu, Qian Yuan, Fangmei An, Shuyu Zhang, Yang Jiao
BACKGROUND: The early occurrence regional nodal and distant metastases cholangiocarcinoma (CCA) is one of the major reasons for its poor prognosis. However, the related mechanisms are largely elusive. Recently, increasing evidences indicate that adipocytes might be involved in the proliferation, homing, migration and invasion of several malignancies. In the present study, we attempt to determine the effects and possible mechanisms of adipocytes on regulating progression of CCA. METHODS: Adipocyte-CCA cell co-culture system and CCA metastasis mice model were used to determine the effects of adipocytes on CCA metastasis...
December 13, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/29237272/bioactive-lipids-and-redox-signaling-molecular-mechanism-and-disease-pathogenesis
#8
Pin Lan Li, Erich Gulbins
SIGNIFICANCE: The actions of bioactive lipids and reactive oxygen species (ROS) are usually coupled and their interplay is a common and important mechanism mediating tissue injury, inflammation and other pathologies. Understanding the interplay of ROS and lipid mediators will extend horizons for researchers to clarify the pathogenesis of different diseases and help identify therapeutic targets for treatment of these diseases. Recent Advances: Some bioactive lipids are converted into oxidized lipids during cell or tissue oxidative stress such as isoprostanes and isoketals, which are even more bioactive compared to their precursors...
December 14, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/29236694/dynamics-of-phosphoinositide-conversion-in-clathrin-mediated-endocytic-traffic
#9
Kangmin He, Robert Marsland Iii, Srigokul Upadhyayula, Eli Song, Song Dang, Benjamin R Capraro, Weiming Wang, Wesley Skillern, Raphael Gaudin, Minghe Ma, Tom Kirchhausen
Vesicular carriers transport proteins and lipids from one organelle to another, recognizing specific identifiers for the donor and acceptor membranes. Two important identifiers are phosphoinositides and GTP-bound GTPases, which provide well-defined but mutable labels. Phosphatidylinositol and its phosphorylated derivatives are present on the cytosolic faces of most cellular membranes. Reversible phosphorylation of its headgroup produces seven distinct phosphoinositides. In endocytic traffic, phosphatidylinositol-4,5-biphosphate marks the plasma membrane, and phosphatidylinositol-3-phosphate and phosphatidylinositol-4-phosphate mark distinct endosomal compartments...
December 13, 2017: Nature
https://www.readbyqxmd.com/read/29236684/cryo-em-structures-of-the-tmem16a-calcium-activated-chloride-channel
#10
Shangyu Dang, Shengjie Feng, Jason Tien, Christian J Peters, David Bulkley, Marco Lolicato, Jianhua Zhao, Kathrin Zuberbühler, Wenlei Ye, Lijun Qi, Tingxu Chen, Charles S Craik, Yuh Nung Jan, Daniel L Minor, Yifan Cheng, Lily Yeh Jan
Calcium-activated chloride channels (CaCCs) encoded by TMEM16A control neuronal signalling, smooth muscle contraction, airway and exocrine gland secretion, and rhythmic movements of the gastrointestinal system. To understand how CaCCs mediate and control anion permeation to fulfil these physiological functions, knowledge of the mammalian TMEM16A structure and identification of its pore-lining residues are essential. TMEM16A forms a dimer with two pores. Previous CaCC structural analyses have relied on homology modelling of a homologue (nhTMEM16) from the fungus Nectria haematococca that functions primarily as a lipid scramblase, as well as subnanometre-resolution electron cryo-microscopy...
December 13, 2017: Nature
https://www.readbyqxmd.com/read/29235657/electric-double-layer-electrostatics-of-lipid-bilayer-encapsulated-nanoparticles-towards-a-better-understanding-of-protocell-electrostatics
#11
Haoyuan Jing, Siddhartha Das
Lipid-bilayer-encapsulated nanoparticles (LBLENPs) or NP-supported LBL systems, such as protocells (which are lipid bilayer encapsulated mesoporous silica nanoparticles or MSNPs) have received extensive attention for applications like targeted drug and gene deliveries, multimodal diagnostics, characterization of membrane-geometry sensitive molecules, etc. Very often electrostatic-mediated interactions have been hypothesized to play key roles in the functioning of these LBLENPs. Despite that, very little has been done to theoretically quantify the fundamental electric double layer (EDL) electrostatics of such LBLENPs...
December 13, 2017: Electrophoresis
https://www.readbyqxmd.com/read/29234430/antidyslipidemic-anti-inflammatory-and-antioxidant-activities-of-aqueous-leaf-extract-of-dioscoreophyllum-cumminsii-stapf-diels-in-high-fat-diet-fed-rats
#12
O B Ibitoye, U M Ghali, J B Adekunle, J N Uwazie, T O Ajiboye
Dioscoreophyllum cumminsii (Stapf) Diels leaves are widely used in the treatment of diabetes, obesity, and cardiovascular related complications in Nigeria. This study investigates the anti-inflammatory and antiobesity effect of aqueous extract of Dioscoreophyllum cumminsii leaves in high-fat diet- (HFD-) induced obese rats. HFD-fed rats were given 100, 200, and 400 mgkg-1 body weight of aqueous extract of Dioscoreophyllum cumminsii leaves for 4 weeks starting from 9th week of HFD treatment. D. cumminsii leaves aqueous extract reversed HFD-mediated decrease in the activities of superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, and glucose 6-phosphate dehydrogenase...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/29234381/antihyperglycemic-antidiabetic-and-antioxidant-effects-of-garcinia-pedunculata-in-rats
#13
Md Yousuf Ali, Sudip Paul, E M Tanvir, Md Sakib Hossen, Nur-E Noushin Rumpa, Moumoni Saha, Nikhil Chandra Bhoumik, Md Aminul Islam, Md Sabir Hossain, Nadia Alam, Siew Hua Gan, Md Ibrahim Khalil
The antihyperglycemic, antidiabetic, and antioxidant potentials of the methanolic extract of Garcinia pedunculata (GP) fruit in rats were investigated. The acute antihyperglycemic effect of different doses of GP was studied in normal male Wistar rats. Diabetes was induced by streptozotocin (STZ) injection in another cohort of male Wistar rats and they showed significantly higher blood glucose and glycated hemoglobin (HbA1c) levels, altered lipid profiles, and lower insulin levels compared to nondiabetic control animals...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/29234336/evolution-and-expansion-of-the-prokaryote-like-lipoxygenase-family-in-the-brown-alga-saccharina-japonica
#14
Linhong Teng, Wentao Han, Xiao Fan, Dong Xu, Xiaowen Zhang, Simon M Dittami, Naihao Ye
Lipoxygenase (LOX) plays important roles in fatty acid oxidation and lipid mediator biosynthesis. In this study, we give first insights into brown algal LOX evolution. Whole genome searches revealed four, three, and eleven LOXs in Ectocarpus siliculosus, Cladosiphon okamuranus, and Saccharina japonica, respectively. In phylogenetic analyses, LOXs from brown algae form a robust clade with those from prokaryotes, suggesting an ancestral origin and slow evolution. Brown algal LOXs were divided into two clades, C1 and C2 in a phylogenetic tree...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29233991/structure-of-outer-membrane-protein-g-in-lipid-bilayers
#15
Joren S Retel, Andrew J Nieuwkoop, Matthias Hiller, Victoria A Higman, Emeline Barbet-Massin, Jan Stanek, Loren B Andreas, W Trent Franks, Barth-Jan van Rossum, Kutti R Vinothkumar, Lieselotte Handel, Gregorio Giuseppe de Palma, Benjamin Bardiaux, Guido Pintacuda, Lyndon Emsley, Werner Kühlbrandt, Hartmut Oschkinat
β-barrel proteins mediate nutrient uptake in bacteria and serve vital functions in cell signaling and adhesion. For the 14-strand outer membrane protein G of Escherichia coli, opening and closing is pH-dependent. Different roles of the extracellular loops in this process were proposed, and X-ray and solution NMR studies were divergent. Here, we report the structure of outer membrane protein G investigated in bilayers of E. coli lipid extracts by magic-angle-spinning NMR. In total, 1847 inter-residue 1H-1H and 13C-13C distance restraints, 256 torsion angles, but no hydrogen bond restraints are used to calculate the structure...
December 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29233990/balancing-mcr-1-expression-and-bacterial-survival-is-a-delicate-equilibrium-between-essential-cellular-defence-mechanisms
#16
Qiue Yang, Mei Li, Owen B Spiller, Diego O Andrey, Philip Hinchliffe, Hui Li, Craig MacLean, Pannika Niumsup, Lydia Powell, Manon Pritchard, Andrei Papkou, Yingbo Shen, Edward Portal, Kirsty Sands, James Spencer, Uttapoln Tansawai, David Thomas, Shaolin Wang, Yang Wang, Jianzhong Shen, Timothy Walsh
MCR-1 is a lipid A modifying enzyme that confers resistance to the antibiotic colistin. Here, we analyse the impact of MCR-1 expression on E. coli morphology, fitness, competitiveness, immune stimulation and virulence. Increased expression of mcr-1 results in decreased growth rate, cell viability, competitive ability and significant degradation in cell membrane and cytoplasmic structures, compared to expression of catalytically inactive MCR-1 (E246A) or MCR-1 soluble component. Lipopolysaccharide (LPS) extracted from mcr-1 strains induces lower production of IL-6 and TNF, when compared to control LPS...
December 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29233736/fumonisin-b1-induces-oxidative-stress-in-oesophageal-sno-cancer-cells
#17
René B Khan, Alisa Phulukdaree, Anil A Chuturgoon
Fumonisin B1 (FB1) is a ubiquitous contaminant of maize that is epidemiologically linked to oesophageal cancer (OC) in South Africa. FB1-induced oxidative stress mediates toxicity in animals and human cell lines, but the effects relating to OC are limited. Given the species-specific effects of FB1, this study investigated FB1-mediated toxicity and oxidative stress in spindle-shaped N-cadherin (+) CD45 (-) osteoblastic (SNO) cells. Following exposure to FB1 (0-20 μM) for 48 h, mitochondrial membrane potential and intracellular reactive oxygen species (iROS) were measured (flow cytometry)...
December 9, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29233215/unraveling-amyloid-formation-paths-of-parkinson-s-disease-protein-%C3%AE-synuclein-triggered-by-anionic-vesicles
#18
Juris Kiskis, Istvan Horvath, Pernilla Wittung-Stafshede, Sandra Rocha
Amyloid formation of the synaptic brain protein α-synuclein (αS) is related to degeneration of dopaminergic neurons in Parkinson's disease patients. αS is thought to function in vesicle transport and fusion and it binds strongly to negatively charged vesicles in vitro. Here we combined circular dichroism, fluorescence and imaging methods in vitro to characterize the interaction of αS with negatively charged vesicles of DOPS (1,2-dioleoyl-sn-glycero-3-phospho-L-serine, sodium salt) and DOPG (1,2-dioleoyl-sn-glycero-3-phospho-(1'-rac-glycerol), sodium salt) and the consequences of such interactions on αS amyloid formation...
January 2017: Quarterly Reviews of Biophysics
https://www.readbyqxmd.com/read/29233142/role-of-disturbed-fatty-acids-metabolism-in-the-pathophysiology-of-diabetic-erectile-dysfunction
#19
Mohamed Raâfet Ben Khedher, Houda Bouhajja, Samia Haj Ahmed, Mohamed Abid, Kamel Jamoussi, Mohamed Hammami
BACKGROUND: Vasculogenic erectile dysfunction (VED) is considered as a common complication among people with type 2 diabetes (T2D). We tested whether changes in fatty acid (FAs) classes measured in erythrocytes are associated with increased risk of diabetic VED along with related risk factors. METHODS: We assessed erythrocyte FAs composition, lipid peroxidation parameters and inflammatory cytokines among 72 T2D men with VED, 78 T2D men without VED and 88 healthy volunteers with similar age...
December 12, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/29233018/type-1-diabetic-patients-have-better-endothelial-function-after-simultaneous-pancreas-kidney-transplantation-than-after-kidney-transplantation-with-continued-insulin-therapy
#20
Jacek Ziaja, Adrian P Kowalik, Aureliusz Kolonko, Dorota Kamińska, Aleksander J Owczarek, Agata Kujawa-Szewieczek, Mariusz A Kusztal, Joanna Badura, Dominika Bożek-Pająk, Piotr Choręza, Agnieszka Zakrzewska, Robert Król, Stefan Chłopicki, Marian Klinger, Andrzej Więcek, Jerzy Chudek, Lech Cierpka
The purpose of this study was to analyse the influence of simultaneous pancreas-kidney or kidney transplantation on endothelial function and systemic inflammation in type 1 diabetic patients with end-stage renal disease. In 39 simultaneous pancreas-kidney, 39 type 1 diabetic kidney and 52 non-diabetic kidney recipients, flow-mediated dilatation was measured. Additionally, blood glycated haemoglobin, serum creatinine and lipids, plasma nitrites [Formula: see text] and nitrates, asymmetric dimethylarginine, soluble vascular cell adhesion molecule-1, intercellular adhesion molecule-1, and E-selectin, high-sensitivity C-reactive protein, tumour necrosis factor-α, interleukin 1β and interleukin 6 concentrations were assessed...
December 1, 2017: Diabetes & Vascular Disease Research
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