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Lipids

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https://www.readbyqxmd.com/read/28210982/new-and-uncommon-fatty-acids-in-lipids-of-deep-sea-foraminifera
#1
Vladimir I Kharlamenko, Vasily I Svetashev, Tatyana S Tarasova
Fatty acids (FA) of agglutinating foraminifera of two genera, Bathysiphon and Rhabdammina, collected from a depth of 3307-3377 m in the Kuril Basin, Sea of Okhotsk, and adjacent deep-sea waters of the Pacific Ocean, were analyzed. In lipids of two Bathysiphon species, in addition to common FA typical for marine organisms, the uncommon ∆4 and ∆7 monoenoic acids and ∆4,7-dienoic acid were found in noticeable amounts. FA of two Rhabdammina species included also such uncommon acids as ∆5,8,11,14-21:4, ∆5,8,11,14-22:4, and ∆5,8,11,14-23:4, which are homologues to arachidonic acid...
February 16, 2017: Lipids
https://www.readbyqxmd.com/read/28205069/transcriptomic-analysis-of-thp-1-macrophages-exposed-to-lipoprotein-hydrolysis-products-generated-by-lipoprotein-lipase
#2
Narmadaa Thyagarajan, Jenika D Marshall, Arthur T Pickett, Clemens Schumacher, Yanbo Yang, Sherri L Christian, Robert J Brown
Macrophage lipoprotein lipase (LPL) induces lipid accumulation and promotes atherosclerosis. However, the effects of lipoprotein hydrolysis products generated by LPL on macrophage-derived foam cell formation are not clearly understood. Thus, we analyzed the transcriptomic response to hydrolysis products via microarray analyses on RNA isolated from human THP-1 macrophages incubated with total lipoprotein hydrolysis products generated by LPL. The expression of 183 transcripts was significantly upregulated and 133 transcripts were significantly downregulated...
February 15, 2017: Lipids
https://www.readbyqxmd.com/read/28197856/determination-of-substrate-preferences-for-desaturases-and-elongases-for-production-of-docosahexaenoic-acid-from-oleic-acid-in-engineered-canola
#3
Jenny Lindberg Yilmaz, Ze Long Lim, Mirela Beganovic, Steven Breazeale, Carl Andre, Sten Stymne, Patricia Vrinten, Toralf Senger
Production of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in plant seed oils has been pursued to improve availability of these omega-3 fatty acids that provide important human health benefits. Canola (Brassica napus), through the introduction of 10 enzymes, can convert oleic acid (OLA) into EPA and ultimately DHA through a pathway consisting of two elongation and five desaturation steps. Herein we present an assessment of the substrate specificity of the seven desaturases and three elongases that were introduced into canola by expressing individual proteins in yeast...
February 14, 2017: Lipids
https://www.readbyqxmd.com/read/28194557/-4z-15z-octadecadienoic-acid-inhibits-glycogen-synthase-kinase-3%C3%AE-and-glucose-production-in-h4iie-cells
#4
Jun Yoshida, Shota Uesugi, Tetsuaki Kawamura, Ken-Ichi Kimura, Dawei Hu, Shuang Xia, Naoki Toyooka, Masao Ohnishi, Hideki Kawashima
Many uncommon non-methylene-interrupted fatty acids (NMI FA) are present in limpet gonads, but their biological properties remain unknown. To investigate new biological effects of naturally occurring NMI FA in eukaryotic cells, the biological activities of structurally analogous (4Z,15Z)-octadecadienoic acid (1), (9Z,20Z)-tricosadienoic acid (2), and (12Z,23Z)-hexacosadienoic acid (3) were examined by using a yeast-based drug-screening system using the Ca(2+)-sensitive mutant strain, Saccharomyces cerevisiae (zds1Δ erg3Δ pdr1Δ pdr3Δ)...
February 13, 2017: Lipids
https://www.readbyqxmd.com/read/28161835/changes-in-lipid-and-fatty-acid-composition-during-intramacrophagic-transformation-of-leishmania-donovani-complex-promastigotes-into-amastigotes
#5
Hana Bouazizi-Ben Messaoud, Marion Guichard, Philippe Lawton, Isabelle Delton, Samira Azzouz-Maache
Leishmania sp., are trypanosomatid parasites that are phagocytized by human and animal macrophages. Transformation from the vector promastigote stage to the intracellular amastigote host cell stage is mandatory, since development in the host depends on the internalization of the parasite. We identified and analyzed the lipids involved in the promastigote to amastigote transformation process in the Leishmania donovani complex. Four lipid classes, phospholipids, free fatty acids, triglycerides and sterols were studied...
February 4, 2017: Lipids
https://www.readbyqxmd.com/read/28132119/epa-dha-and-lipoic-acid-differentially-modulate-the-n-3-fatty-acid-biosynthetic-pathway-in-atlantic-salmon-hepatocytes
#6
Marta Bou, Tone-Kari Østbye, Gerd M Berge, Bente Ruyter
The aim of the present study was to investigate how EPA, DHA, and lipoic acid (LA) influence the different metabolic steps in the n-3 fatty acid (FA) biosynthetic pathway in hepatocytes from Atlantic salmon fed four dietary levels (0, 0.5, 1.0 and 2.0%) of EPA, DHA or a 1:1 mixture of these FA. The hepatocytes were incubated with [1-(14)C] 18:3n-3 in the presence or absence of LA (0.2 mM). Increased endogenous levels of EPA and/or DHA and LA exposure both led to similar responses in cells with reduced desaturation and elongation of [1-(14)C] 18:3n-3 to 18:4n-3, 20:4n-3, and EPA, in agreement with reduced expression of the Δ6 desaturase gene involved in the first step of conversion...
January 28, 2017: Lipids
https://www.readbyqxmd.com/read/28091798/intake-of-up-to-3-eggs-day-increases-hdl-cholesterol-and-plasma-choline-while-plasma-trimethylamine-n-oxide-is-unchanged-in-a-healthy-population
#7
Diana M DiMarco, Amanda Missimer, Ana Gabriela Murillo, Bruno S Lemos, Olga V Malysheva, Marie A Caudill, Christopher N Blesso, Maria Luz Fernandez
Eggs are a source of cholesterol and choline and may impact plasma lipids and trimethylamine-N-oxide (TMAO) concentrations, which are biomarkers for cardiovascular disease (CVD) risk. Therefore, the effects of increasing egg intake (0, 1, 2, and 3 eggs/day) on these and other CVD risk biomarkers were evaluated in a young, healthy population. Thirty-eight subjects [19 men/19 women, 24.1 ± 2.2 years, body mass index (BMI) 24.3 ± 2.5 kg/m(2)] participated in this 14-week crossover intervention. Participants underwent a 2-week washout with no egg consumption, followed by intake of 1, 2, and 3 eggs/day for 4 weeks each...
January 13, 2017: Lipids
https://www.readbyqxmd.com/read/28083781/dietary-fatty-acids-influence-the-growth-and-fatty-acid-composition-of-the-yellow-mealworm-tenebrio-molitor-coleoptera-tenebrionidae
#8
Elena Dreassi, Annarita Cito, Assunta Zanfini, Lara Materozzi, Maurizio Botta, Valeria Francardi
Fat is the second most abundant component of the nutrient composition of the mealworm Tenebrio molitor (Coleoptera: Tenebrionidae) that represents also an interesting source of PUFA, especially n-6 and n-3 fatty acids, involved in prevention of cardiovascular diseases. This study investigated the possibility of modifying the fat content and the FA composition of yellow mealworms through feeding and how this would be influenced by developmental stages, pupal sex, and generation with the future aim of applying this coleopteran as a diet supplement for human health...
January 12, 2017: Lipids
https://www.readbyqxmd.com/read/28074319/trans-fatty-acid-stimulated-mammary-gland-growth-in-ovariectomized-mice-is-fatty-acid-type-and-isomer-specific
#9
Grace E Berryhill, Susan G Miszewski, Josephine F Trott, Jana Kraft, Adam L Lock, Russell C Hovey
We previously reported that the trans-18:2 fatty acid trans-10, cis-12 conjugated linoleic acid (t10,c12-CLA) stimulates mammary gland development independent of estrogen and its receptor. Given the negative consequences of dietary trans-fatty acids on various aspects of human health, we sought to establish whether other trans-fatty acids could similarly induce ovary-independent mammary gland growth in mice. Prepubertal BALB/cJ mice were ovariectomized at 21 days of age then were fed diets enriched with cis-9, trans-11 CLA (c9,t11-CLA), or mixtures of trans-18:1 fatty acids supplied by partially hydrogenated sunflower, safflower, or linseed oil...
January 10, 2017: Lipids
https://www.readbyqxmd.com/read/28044232/lipid-emulsions-containing-medium-chain-triacylglycerols-blunt-bradykinin-induced-endothelium-dependent-relaxation-in-porcine-coronary-artery-rings
#10
Said Amissi, Julie Boisramé-Helms, Mélanie Burban, Sherzad K Rashid, Antonio J León-González, Cyril Auger, Florence Toti, Ferhat Meziani, Valérie B Schini-Kerth
Lipid emulsions for parenteral nutrition are used to provide calories and essential fatty acids for patients. They have been associated with hypertriglyceridemia, hypercholesterolemia, and metabolic stress, which may promote the development of endothelial dysfunction in patients. The aim of the present study was to determine whether five different industrial lipid emulsions may affect the endothelial function of coronary arteries. Porcine coronary artery rings were incubated with lipid emulsions 0.5, 1, or 2% (v/v) for 30 min before the determination of vascular reactivity in organ chambers and the level of oxidative stress using electron paramagnetic resonance...
January 2, 2017: Lipids
https://www.readbyqxmd.com/read/28039586/plasma-phospholipid-fatty-acid-profile-is-altered-in-both-septic-and-non-septic-critically-ill-a-correlation-with-inflammatory-markers-and-albumin
#11
František Novak, J Borovska, M Vecka, J Rychlikova, L Vavrova, H Petraskova, A Zak, O Novakova
This study analyzes fatty acid (FA) composition in plasma lipids and erythrocyte phospholipids while comparing septic and non-septic critically ill patients. The aim was to describe impacts of infection and the inflammatory process. Patients with severe sepsis (SP, n = 13); age-, sex- and APACHE II score-matched non-septic critically ill with systemic inflammatory response syndrome (NSP, n = 13); and age-/sex-matched healthy controls (HC, n = 13) were included in a prospective case-control study during the first 24 h after admission to the intensive care unit...
December 30, 2016: Lipids
https://www.readbyqxmd.com/read/27981494/fall-composition-of-storage-lipids-is-associated-with-the-overwintering-strategy-of-daphnia
#12
Heather L Mariash, Mathieu Cusson, Milla Rautio
Diapause, which occurs through the production of dormant eggs, is a strategy used by some zooplankton to avoid winter months of persistent low temperatures and low food availability. However, reports of active zooplankton under the ice indicate that other strategies also exist. This study was aimed at evaluating whether the composition of storage lipids in the fall differs between diapausing and active overwintering Daphnia. We assessed the quantity of storage lipids and fatty acid (FA) composition of Daphnia species, along with FA content of seston, in six boreal, alpine and subarctic lakes at the onset of winter, and evaluated the association between storage lipids and Daphnia overwintering strategy...
December 15, 2016: Lipids
https://www.readbyqxmd.com/read/27914034/identification-of-oxidized-phosphatidylinositols-present-in-oxldl-and-human-atherosclerotic-plaque
#13
Devin Hasanally, Andrea Edel, Rakesh Chaudhary, Amir Ravandi
Oxidized low-density lipoprotein (OxLDL) plays an important role in initiation and progression of atherosclerosis. Proatherogenic effects of OxLDL have been attributed to bioactive phospholipids generated during LDL oxidation. It is unknown what effect oxidation has on the phosphatidylinositol (PtdIns) molecules in LDL, even though PtdIns is 6% of the total LDL phospholipid pool. We sought to identify and quantitate oxidized phosphatidylinositol (OxPtdIns) species in OxLDL and human atherosclerotic plaque. Bovine liver PtdIns was subjected to non-enzymatic and lipoxygenase-catalyzed oxidation...
December 2, 2016: Lipids
https://www.readbyqxmd.com/read/27905068/inhibition-of-mevalonate-pathway-and-synthesis-of-the-storage-lipids-in-human-liver-derived-and-non-liver-cell-lines-by-lippia-alba-essential-oils
#14
Sandra Montero-Villegas, Mónica Polo, Marianela Galle, Boris Rodenak-Kladniew, María Castro, Ana Ves-Losada, Rosana Crespo, Margarita García de Bravo
The essential oils (EOs) of Lippia alba, an herb extensively used as a folk medicine in Latin America, are today promoted as an effective means of eliminating problems caused by hyperlipemia. We hypothesized that L.alba EOs inhibited cholesterol and triacylglycerols synthesis and decreased the intracellular depots of those lipids (lipid droplets), mechanisms involving the induction of a hypolipidemic response. Our aim was, therefore, to evaluate the hypolipogenic capability of the EOs of four L. alba chemotypes on liver-derived (HepG2) and non-liver (A549) human cell lines and to identify the potential biochemical targets of those chemotypes, particularly within the mevalonate pathway (MP)...
November 30, 2016: Lipids
https://www.readbyqxmd.com/read/28097490/glucose-uptake-and-triacylglycerol-synthesis-are-increased-in-barth-syndrome-lymphoblasts
#15
Edgard M Mejia, James C Zinko, Kristin D Hauff, Fred Y Xu, Amir Ravandi, Grant M Hatch
Barth syndrome (BTHS) is an X-linked genetic disease resulting in loss of cardiolipin (Ptd2Gro). Patients may be predisposed to hypoglycemia and exhibit increases in whole-body glucose disposal rates and a higher fat mass percentage. We examined the reasons for this in BTHS lymphoblasts. BTHS lymphoblasts exhibited a 60% increase (p < 0.004) in 2-[1,2-(3)H(N)]deoxy-D-glucose uptake, a 40% increase (p < 0.01) in glucose transporter-3 protein expression, an increase in phosphorylated-adenosine monophosphate kinase (AMPK) and a 58% increase (p < 0...
February 2017: Lipids
https://www.readbyqxmd.com/read/28093643/high-content-of-dicranin-in-anisothecium-spirale-mitt-broth-a-moss-from-eastern-himalayas-and-its-chemotaxonomic-significance
#16
Souvik Mitra
Chemical investigation of Anisothecium spirale (Mitt.) Broth. (Family Dicranaceae), an epiphytic moss from the Darjeeling district hill region of the Eastern Himalayas was performed for the first time. Analysis of neutral lipid and phospholipid classes as well as their respective fatty acids revealed the presence of a significantly high content of octadeca-6-yn-9,12,15-trienoic acid, an acetylenic fatty acid commonly known as dicranin. Dicranin and a less abundant acetylenic fatty acid were detected in neutral lipids...
February 2017: Lipids
https://www.readbyqxmd.com/read/28078603/a-comparison-of-the-anti-inflammatory-effects-of-cis-9-trans-11-conjugated-linoleic-acid-to-celecoxib-in-the-collagen-induced-arthritis-model
#17
Jake M Olson, Alexander W Haas, Jennifer Lor, Holly S McKee, Mark E Cook
Cyclooxygenase (COX)-2 inhibitors, such as celecoxib, for chronic inflammatory disease are associated with adverse health events, while cis-9, trans-11 (c9t11) conjugated linoleic acid (CLA) is anti-inflammatory without adverse events attributed to pure intake. Mechanistically, celecoxib and c9t11 disrupt the arachidonic acid cascade; however, the equivalency of anti-inflammatory effects between these compounds is unknown. Therefore, to test the hypothesis that 0.5% dietary c9t11 reduces inflammation equivalently to a celecoxib dose intended to treat rheumatoid arthritis (RA; 5 mg/kg bw), arthritic mice received diets containing one of the following supplements: 1% corn oil (CO, w/w), 0...
February 2017: Lipids
https://www.readbyqxmd.com/read/28078602/sulfatides-primarily-exist-in-the-substantia-nigra-region-of-mouse-brain-tissue
#18
Kab-Tae Park, Jong Cheol Shon, Ji-Eun Kim, Gyu Hwan Park, Hyun Jin Choi, Kwang-Hyeon Liu
Lipid distribution in the brain is important for many biological functions and has been associated with some brain diseases. The aim of this study was to investigate lipid distribution in different regions of brain tissue in mice. To this end, substantia nigra (SN), caudate putamen (CPu), hippocampus (Hip), hypothalamus (Hyp), and cortex (Cx) tissues of mice were analyzed using direct infusion nanoelectrospray-ion trap mass spectrometry and multivariate analyses. The SN, CPu, Hip, Hyp, and Cx groups showed clear differences in lipid distribution using principal component analysis and a partial least-squares discriminant analysis score plot, and lipid levels were significantly different in different brain regions...
February 2017: Lipids
https://www.readbyqxmd.com/read/28070695/barth-syndrome-connecting-cardiolipin-to-cardiomyopathy
#19
REVIEW
Nikita Ikon, Robert O Ryan
The Barth syndrome (BTHS) is caused by an inborn error of metabolism that manifests characteristic phenotypic features including altered mitochondrial membrane phospholipids, lactic acidosis, organic acid-uria, skeletal muscle weakness and cardiomyopathy. The underlying cause of BTHS has been definitively traced to mutations in the tafazzin (TAZ) gene locus on chromosome X. TAZ encodes a phospholipid transacylase that promotes cardiolipin acyl chain remodeling. Absence of tafazzin activity results in cardiolipin molecular species heterogeneity, increased levels of monolysocardiolipin and lower cardiolipin abundance...
February 2017: Lipids
https://www.readbyqxmd.com/read/28039587/tgf-%C3%AE-down-regulates-apolipoprotein-m-expression-through-the-tak-1-jnk-c-jun-pathway-in-hepg2-cells
#20
Kun Ren, Zhong-Cheng Mo, Xing Liu, Zhen-Li Tang, Yue Jiang, Xiao-Shan Peng, Qing-Hai Zhang, Jin-Feng Shi, Guang-Hui Yi
Apolipoprotein M (apoM) is a relatively novel apolipoprotein that plays pivotal roles in many dyslipidemia-associated diseases; however, its regulatory mechanisms are poorly understood. Many cytokines have been identified that down-regulate apoM expression in HepG2 cells, among which transforming growth factor-β (TGF-β) exerts the most potent effects. In addition, c-Jun, a member of the activated protein 1 (AP-1) family whose activity is modulated by c-Jun N-terminal kinase (JNK), decreases apoM expression at the transcriptional level by binding to the regulatory element in the proximal apoM promoter...
February 2017: Lipids
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