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Fatty acid synthase

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https://www.readbyqxmd.com/read/28448715/acyl-carrier-protein-cyanylation-delivers-a-ketoacyl-synthase-carrier-protein-crosslink
#1
Grace Thiele, Conne Friedman, Kathleen Tsai, Joris Beld, Casey H Londergan, Louise K Charkoudian
Acyl carrier proteins (ACPs) are central hubs in polyketide and fatty acid biosynthetic pathways, but the fast motions of the ACP's phosphosphopantetheine (Ppant) arm make its conformational dynamics difficult to capture using traditional spectroscopic approaches. Here we report that converting the terminal thiol of E. coli ACP's Ppant arm into a thiocyanate activates this site to form a selective crosslink with the active site cys-teine of its partner ketoacyl synthase (KS; FabF). The reaction releases a cyanide anion, which can be detected by infrared spectroscopy...
April 27, 2017: Biochemistry
https://www.readbyqxmd.com/read/28448543/heterologous-expression-of-a-thermophilic-diacylglycerol-acyltransferase-triggers-triglyceride-accumulation-in-escherichia-coli
#2
Beatriz Lázaro, Juan A Villa, Omar Santín, Matilde Cabezas, Cintia D F Milagre, Fernando de la Cruz, Gabriel Moncalián
Triglycerides (TAGs), the major storage molecules of metabolic energy and source of fatty acids, are produced as single cell oil by some oleogenic microorganisms. However, these microorganisms require strict culture conditions, show low carbon source flexibilities, lack efficient genetic modification tools and in some cases pose safety concerns. TAGs have essential applications such as behaving as a source for added-value fatty acids or giving rise to the production of biodiesel. Hence, new alternative methods are urgently required for obtaining these oils...
2017: PloS One
https://www.readbyqxmd.com/read/28447762/inhibition-of-aldose-reductase-ameliorates-ethanol%C3%A2-induced-steatosis-in-hepg2-cells
#3
Longxin Qiu, Chengchao Cai, Xiangqian Zhao, Yan Fang, Weibiao Tang, Chang Guo
Aldose reductase (AR) expression is increased in liver tissue of patients with ethanol‑induced liver disease. However, the exact role of AR in the development of ethanol‑induced liver disease has yet to be elucidated. The present study aimed to determine the effect of an AR inhibitor on ethanol‑induced steatosis in HepG2 cells and to identify possible underlying molecular mechanisms. Steatosis was induced in HepG2 cells by stimulating cells with 100 mM absolute ethanol for 48 h. Oil Red O staining was used to detect the lipid droplet accumulation in cells...
March 10, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28447751/deep-sea-water-improves-hypercholesterolemia-and-hepatic-lipid-accumulation-through-the-regulation-of-hepatic-lipid-metabolic-gene-expression
#4
Kyu-Shik Lee, So-Young Chun, Yun-Suk Kwon, Soyoung Kim, Kyung-Soo Nam
A high‑fat diet or high‑cholesterol diet (HCD) is a major cause of metabolic diseases, including obesity and diabetes; vascular diseases, including hypertension, stroke and arteriosclerosis; and liver diseases, including hepatic steatosis and cirrhosis. The present study aimed to evaluate the effects of deep sea water (DSW) on rats fed a HCD. DSW decreased HCD‑induced increases in total cholesterol and low‑density lipoprotein (LDL) cholesterol in the blood, and recovered high‑density lipoprotein cholesterol...
March 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28444942/combined-inhibition-of-autophagy-protein-5-and-galectin-1-by-thiodigalactoside-reduces-diet-induced-obesity-through-induction-of-white-fat-browning
#5
Hilal Ahmad Parray, Jong Won Yun
Our previous study demonstrated that thiodigalactoside (TDG) ameliorates obesity by targeted inhibition of galectin-1 (GAL1). Here, for the first time, we report the unexpected role of GAL1 and ATG5 inhibition by TDG in lipid metabolism. Core thermogenic marker proteins and genes were highly induced in white adipose tissue (WAT) of rats fed a high fat diet (HFD) and TDG, resulting in the significant development of brown fat-like adipocytes in inguinal WAT. TDG treatment reduced weight gain and fat mass as well as activated brown adipose tissue (BAT) in HFD-fed rats...
April 26, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28443464/increased-haglr-expression-promotes-non-small-cell-lung-cancer-proliferation-and-invasion-via-enhanced-de-novo-lipogenesis
#6
Chunwei Lu, Jun Ma, Dingfang Cai
Lung cancers are broadly classified into small cell lung cancer and non-small cell lung cancer, with non-small cell lung cancer one of the leading causes of cancer-associated deaths worldwide. Presently, the mechanisms underlying lung tumorigenesis remain incompletely understood. Accumulating evidence indicates that abnormal expression of long non-coding RNAs is associated with tumorigenesis in multiple cancers, including lung cancer. HAGLR messenger RNA of non-small cell lung cancer tissues was significantly higher...
April 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28443075/grim-19-restricts-hcv-replication-by-attenuating-intracellular-lipid-accumulation
#7
Jung-Hee Kim, Pil S Sung, Eun B Lee, Wonhee Hur, Dong J Park, Eui-Cheol Shin, Marc P Windisch, Seung K Yoon
Gene-associated with retinoid-interferon-induced mortality 19 (GRIM-19) targets multiple signaling pathways involved in cell death and growth. However, the role of GRIM-19 in the pathogenesis of hepatitis virus infections remains unexplored. Here, we investigated the restrictive effects of GRIM-19 on the replication of hepatitis C virus (HCV). We found that GRIM-19 protein levels were reduced in HCV-infected Huh7 cells and Huh7 cells harboring HCV replicons. Moreover, ectopically expressed GRIM-19 caused a reduction in both intracellular viral RNA levels and secreted viruses in HCVcc-infected cell cultures...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28442505/overexpressed-fatty-acid-synthase-in-gastrointestinal-stromal-tumors-targeting-a-progression-associated-metabolic-driver-enhances-the-antitumor-effect-of-imatinib
#8
Chien-Feng Li, Fu-Min Fang, Yeng-Yang Chen, Ting-Ting Liu, Ti-Chun Chan, Shih-Chen Yu, Li-Tzong Chen, Hsuan-Ying Huang
Purpose: In gastrointestinal stromal tumors (GISTs), lipid-metabolizing enzymes remain underexplored, including fatty acid synthase (FASN). <p>Experimental Design: Forty GISTs were quantitated for FASN mRNA abundance. FASN immunoexpression was informative in 350 GISTs, including 213 with known KIT/PDGFRA/BRAF genotypes. In imatinib-resistant FASN-overexpressing GIST cells, the roles of overexpressed FASN and FASN-targeting C75 in tumor phenotypes, apoptosis and autophagy, KIT transcription, PI3K/AKT/mTOR activation, and imatinib resistance were analyzed by RNA interference or myristoylated-AKT transfection...
April 25, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28440456/tetrahydropalmatine-inhibits-lipid-accumulation-through-ampk-signaling-pathway-in-3t3%C3%A2-l1-adipocytes
#9
Guang-Chun Piao, Guan-Cheng Liu, Xue-Jun Jin, Dan Jin, Hai-Dan Yuan
Tetrahydropalmatine (THP), one of the active components of Rhizoma corydalis, has been reported to exert several pharmacological effects, including anti‑inflammatory, anti‑tumor and analgesic activities. However, its effect on obesity and the underlying molecular mechanisms that may be involved have not yet been elucidated. In the present study, the inhibitory effects of THP on the adipogenesis in 3T3‑L1 adipocytes was examined using hstology, western blotting and RT‑qPCR. THP was identified to significantly suppress lipid accumulation in 3T3‑L1 cells and it inhibited pre‑adipocyte differentiation in a concentration‑dependent manner, as evidenced by the reduced formation of lipid droplets and decreased triglyceride levels and glycerol‑3‑phosphate dehydrogenase activity...
April 12, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28439717/negligible-effect-of-enos-palmitoylation-on-fatty-acid-regulation-of-contraction-in-ventricular-myocytes-from-healthy-and-hypertensive-rats
#10
Chun Li Jin, Yu Na Wu, Ji Hyun Jang, Zai Hao Zhao, Goo Taeg Oh, Sung Joon Kim, Yin Hua Zhang
S-palmitoylation is an important post-translational modification that affects the translocation and the activity of target proteins in a variety of cell types including cardiomyocytes. Since endothelial nitric oxide synthase (eNOS) is known to be palmitoylated and the activity of eNOS is essential in fatty acid-dependent β-oxidation in muscle, we aimed to test whether palmitoylation of eNOS is involved in palmitic acid (PA) regulation of left ventricular (LV) myocyte contraction from healthy (sham) and hypertensive (HTN) rats...
April 25, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28438644/long-term-effects-of-angiotensin-1-7-on-lipid-metabolism-in-the-adipose-tissue-and-liver
#11
Carolina Campos Lima Moreira, Fabíola Cesário Lourenço, Érica Guilhen Mario, Robson Augusto Souza Santos, Leida Maria Botion, Valéria Ernestânia Chaves
The angiotensin (Ang) converting enzyme 2/Ang-(1-7)/Mas axis has been described to have a beneficial role on metabolic disorders. In the present study, the use of a transgenic rat model that chronically overexpresses Ang-(1-7) enabled us to investigate the chronic effects of this peptide on lipid accumulation in the liver and adipose tissue. The transgenic group showed a marked tendency toward increased expression of peroxisome proliferator-activated receptor-γ (PPARγ) and decreased lipoprotein lipase (LPL) expression and activity in epididymal adipose tissue...
April 21, 2017: Peptides
https://www.readbyqxmd.com/read/28437865/a-novel-role-of-astrocyte-elevated-gene-1-aeg-1-in-regulating-non-alcoholic-steatohepatitis-nash
#12
Jyoti Srivastava, Chadia L Robertson, Kareem Ebeid, Mikhail Dozmorov, Devaraja Rajasekaran, Rachel Mendoza, Ayesha Siddiq, Maaged A Akiel, Nidhi Jariwala, Xue-Ning Shen, Jolene J Windle, Mark A Subler, Nitai D Mukhopadhyay, Shah Giashuddin, Shobha Ghosh, Zhao Lai, Yidong Chen, Paul B Fisher, Aliasger K Salem, Arun J Sanyal, Devanand Sarkar
Nonalcoholic steatohepatitis (NASH) is the most prevalent cause of chronic liver disease in the Western world. However, an optimum therapy for NASH is yet to be established mandating more in-depth investigation into the molecular pathogenesis of NASH to identify novel regulatory molecules and develop targeted therapies. Here, we unravel a unique function of Astrocyte elevated gene-1/Metadherin (AEG-1/MTDH) in NASH using a transgenic mouse with hepatocyte-specific overexpression of AEG-1 (Alb/AEG-1) and a conditional hepatocyte-specific AEG-1 knockout mouse (AEG-1(ΔHEP) )...
April 24, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28434739/the-effect-of-conjugated-linoleic-acid-acetate-and-their-interaction-on-adipose-tissue-lipid-metabolism-in-nonlactating-cows
#13
N Urrutia, Y Ying, K J Harvatine
During biohydrogenation-induced milk fat depression, adipose tissue lipogenesis may be increased through nutrients spared from milk fat synthesis. However, the direct effect of trans-10, cis-12 conjugated linoleic acid (CLA) and the indirect effect of spared nutrients on adipose tissue lipogenesis during milk fat depression is not clear. The objective of this study was to determine the direct effect of CLA, spared acetate, and their interaction on adipose tissue lipogenesis using nonlactating dairy cows as an experimental model, which allows separation of the effect of CLA and nutrient sparing...
April 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28433656/impaired-endothelium-derived-hyperpolarization-type-relaxation-in-superior-mesenteric-arteries-isolated-from-female-otsuka-long-evans-tokushima-fatty-rats
#14
Takayuki Matsumoto, Shota Kobayashi, Makoto Ando, Shun Watanabe, Maika Iguchi, Kumiko Taguchi, Tsuneo Kobayashi
Endothelium-derived hyperpolarization (EDH) is an important signaling mechanism of endothelium-dependent vasorelaxation, and little attention has been paid to the EDH-type responses in female metabolic syndrome such as that observed with type-2 diabetes. We previously reported that EDH-type relaxation was impaired in superior mesenteric arteries from male Otsuka Long-Evans Tokushima Fatty (OLETF) rat, a model of type-2 diabetes, however, the response was unclear in female OLETF rat. Thus, the aim of this study was to examine if EDH-type relaxation was altered in superior mesenteric arteries isolated from female OLETF rats compared to age-matched, control female Long-Evans Tokushima Otsuka (LETO) rats at age 50-59 weeks...
April 19, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28433582/effects-of-twenty-standard-amino-acids-on-biochemical-constituents-docosahexaenoic-acid-production-and-metabolic-activity-changes-of-crypthecodinium-cohnii
#15
Waseem Safdar, Xinyi Zan, Muhammad Shamoon, Hafiz Rizwan Sharif, Omar Mukama, Xin Tang, Yuanda Song
The influence of 20 standard amino acids was investigated on growth, lipid accumulation, docosahexaenoic acid (DHA) production and cell biochemical composition of Crypthecodinium cohnii. C. cohnii efficiently utilize organic nitrogen (predominantly threonine and to a lesser extent tyrosine and serine) as compared to inorganic nitrogen (NH4)2SO4. However, No significant effect was observed on major biochemical composition of C. cohnii (lipids, carbohydrates and proteins) under N limitation or supplementation with different N-sources...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28431322/xanthohumol-and-8-prenylnaringenin-ameliorate-diabetic-related-metabolic-dysfunctions-in-mice
#16
Raquel Costa, Ilda Rodrigues, Luísa Guardão, Sílvia Rocha-Rodrigues, Carolina Silva, José Magalhães, Manuel Ferreira-de-Almeida, Rita Negrão, Raquel Soares
Type 2 diabetes mellitus (T2DM) is a chronic disease characterized by metabolic disturbances in specific tissues. The present work aimed to analyze the effects of xanthohumol (XN) and 8-prenylnaringenin (8PN), two beer-derived polyphenols, in liver and skeletal muscle lipid and glycolytic metabolism in T2DM mice model. Thirty C57Bl/6 mice were randomly divided into five groups: standard diet (control), high-fat diet (DM), high-fat diet plus ethanol (DM-Ethanol), high-fat diet plus 10 mg/L XN (DM-XN) and high-fat diet plus 10 mg/L 8PN (DM-8PN) during 20 weeks...
April 6, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28430821/dietary-dha-epa-ratio-affected-tissue-fatty-acid-profiles-antioxidant-capacity-hematological-characteristics-and-expression-of-lipid-related-genes-but-not-growth-in-juvenile-black-seabream-acanthopagrus-schlegelii
#17
Min Jin, Óscar Monroig, You Lu, Ye Yuan, Yi Li, Liyun Ding, Douglas R Tocher, Qicun Zhou
An 8-week feeding trial was conducted to investigate the effects of dietary docosahexaenoic to eicosapentaenoic acid ratio (DHA/EPA) on growth performance, fatty acid profiles, antioxidant capacity, hematological characteristics and expression of some lipid metabolism related genes of juvenile black seabream (Acanthopagrus schlegelii) of initial weight 9.47 ± 0.03 g. Five isonitrogenous and isolipidic diets (45% crude protein and 14% crude lipid) were formulated to contain graded DHA/EPA ratios of 0.65, 1...
2017: PloS One
https://www.readbyqxmd.com/read/28429738/fatty-acid-synthase-cooperates-with-protrudin-to-facilitate-membrane-outgrowth-of-cellular-protrusions
#18
Chuanling Zhang, Jiaqi Lu, Huizhong Su, Jing Yang, Demin Zhou
Cellular protrusion formation capacity is a key feature of developing neurons and many eukaryotic cells. However, the mechanisms underlying membrane growth in protrusion formation are largely unclear. In this study, photo-reactive unnatural amino acid 3-(3-methyl-3H-diazirin-3-yl)-propamino-carbonyl-Nε-l-lysine was incorporated by a genetic code expansion strategy into protrudin, a protein localized in acidic endosomes and in the endoplasmic reticulum, that induces cellular protrusion and neurite formation...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28429330/growth-kinetics-fatty-acid-composition-and-metabolic-activity-changes-of-crypthecodinium-cohnii-under-different-nitrogen-source-and-concentration
#19
Waseem Safdar, Muhammad Shamoon, Xinyi Zan, Junaid Haider, Hafiz Rizwan Sharif, Muhammad Shoaib, Yuanda Song
The effect of varying concentrations of the nitrogen source on the growth kinetics, lipid accumulation, lipid and DHA productivity, and fatty acid composition of C. cohnii was elucidated. Growth of C. cohnii was in three distinct growth stages: cell growth, lipid accumulation and a final lipid turnover stage. Most of lipids were accumulated in lipid accumulation stage (48-120 h) though, slow growth rate was observed during this stage. NaNO3 supported significantly higher lipid content (26.9% of DCW), DHA content (0...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28429316/c2-metabolism-in-euglena
#20
Masami Nakazawa
Euglenoids are able to assimilate fatty acids and alcohols with various carbon-chain lengths, and ethanol is known to be one of the best carbon sources to support the growth of Euglena gracilis. Ethanol is first oxidized to acetate by the sequential reactions of alcohol dehydrogenase and acetaldehyde dehydrogenase in the mitochondria, and then converted to acetyl coenzyme A (acetyl-CoA). Acetyl-CoA is metabolized through the glyoxylate cycle which is a modified tricarboxylic acid (TCA) cycle in which isocitrate lyase (ICL) and malate synthase (MS) function to bypass the two decarboxylation steps of the TCA cycle, enabling the net synthesis of carbohydrates from C2 compounds...
2017: Advances in Experimental Medicine and Biology
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