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https://www.readbyqxmd.com/read/29330356/metabolic-and-molecular-changes-associated-with-the-increased-skeletal-muscle-insulin-action-24-48%C3%A2-h-after-exercise-in-young-and-old-humans
#1
REVIEW
Francis B Stephens, Kostas Tsintzas
The molecular and metabolic mechanisms underlying the increase in insulin sensitivity (i.e. increased insulin-stimulated skeletal muscle glucose uptake, phosphorylation and storage as glycogen) observed from 12 to 48 h following a single bout of exercise in humans remain unresolved. Moreover, whether these mechanisms differ with age is unclear. It is well established that a single bout of exercise increases the translocation of the glucose transporter, GLUT4, to the plasma membrane. Previous research using unilateral limb muscle contraction models in combination with hyperinsulinaemia has demonstrated that the increase in insulin sensitivity and glycogen synthesis 24 h after exercise is also associated with an increase in hexokinase II (HKII) mRNA and protein content, suggesting an increase in the capacity of the muscle to phosphorylate glucose and divert it towards glycogen synthesis...
January 12, 2018: Biochemical Society Transactions
https://www.readbyqxmd.com/read/29329795/omega-3-fatty-acids-and-adipose-tissue-biology
#2
REVIEW
Ondrej Kuda, Martin Rossmeisl, Jan Kopecky
This review provides evidence for the importance of white and brown adipose tissue (i.e. WAT and BAT) function for the maintenance of healthy metabolic phenotype and its preservation in response to omega-3 polyunsaturated fatty acids (omega-3 PUFA), namely in the context of diseased states linked to aberrant accumulation of body fat, systemic low-grade inflammation, dyslipidemia and insulin resistance. More specifically, the review deals with (i) the concept of immunometabolism, i.e. how adipose-resident immune cells and adipocytes affect each other and define the immune-metabolic interface; and (ii) the characteristic features of "healthy adipocytes" in WAT, which are relatively small fat cells endowed with a high capacity for mitochondrial oxidative phosphorylation, triacylglycerol/fatty acid (TAG/FA) cycling and de novo lipogenesis (DNL)...
January 9, 2018: Molecular Aspects of Medicine
https://www.readbyqxmd.com/read/29323242/adipose-specific-lipin1-overexpression-in-mice-protects-against-alcohol-induced-liver-injury
#3
Wenliang Zhang, Wei Zhong, Qian Sun, Xinguo Sun, Zhanxiang Zhou
Excessive fatty acid release from the white adipose tissue (WAT) contributes to the development of alcoholic liver disease (ALD). Lipin1 (LPIN1), as a co-regulator of DNA-bound transcription factors and a phosphatidic acid (PA) phosphatase (PAP) enzyme that dephosphorylates PA to form diacylglycerol (DAG), is dramatically reduced by alcohol in the WAT. This study aimed at determining the role of adipose LPIN1 in alcohol-induced lipodystrophy and the development of ALD. Transgenic mice overexpressing LPIN1 in adipose tissue (LPIN1-Tg) and wild type (WT) mice were fed a Lieber-DeCarli alcohol or isocaloric maltose dextrin control liquid diet for 8 weeks...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321376/retinal-de-novo-lipogenesis-coordinates-neurotrophic-signaling-to-maintain-vision
#4
Rithwick Rajagopal, Sheng Zhang, Xiaochao Wei, Teresa Doggett, Sangeeta Adak, Jennifer Enright, Vaishali Shah, Guoyu Ling, Shiming Chen, Jun Yoshino, Fong-Fu Hsu, Clay F Semenkovich
Membrane lipid composition is central to the highly specialized functions of neurological tissues. In the retina, abnormal lipid metabolism causes severe forms of blindness, often through poorly understood neuronal cell death. Here, we demonstrate that deleting the de novo lipogenic enzyme fatty acid synthase (FAS) from the neural retina, but not the vascular retina, results in progressive neurodegeneration and blindness with a temporal pattern resembling rodent models of retinitis pigmentosa. Blindness was not rescued by protection from light-evoked activity; by eating a diet enriched in palmitate, the product of the FAS reaction; or by treatment with the PPARα agonist fenofibrate...
January 11, 2018: JCI Insight
https://www.readbyqxmd.com/read/29320480/pharmacological-activation-of-rev-erbs-is-lethal-in-cancer-and-oncogene-induced-senescence
#5
Gabriele Sulli, Amy Rommel, Xiaojie Wang, Matthew J Kolar, Francesca Puca, Alan Saghatelian, Maksim V Plikus, Inder M Verma, Satchidananda Panda
The circadian clock imposes daily rhythms in cell proliferation, metabolism, inflammation and DNA damage response. Perturbations of these processes are hallmarks of cancer and chronic circadian rhythm disruption predisposes individuals to tumour development. This raises the hypothesis that pharmacological modulation of the circadian machinery may be an effective therapeutic strategy for combating cancer. REV-ERBs, the nuclear hormone receptors REV-ERBα (also known as NR1D1) and REV-ERBβ (also known as NR1D2), are essential components of the circadian clock...
January 10, 2018: Nature
https://www.readbyqxmd.com/read/29319436/plasma-fatty-acids-as-markers-for-desaturase-and-elongase-activities-in-spinal-cord-injured-males
#6
Lynnette M Jones, Michael Legge
OBJECTIVE: To investigate the use of surrogate plasma fatty acid analysis to provide further insights into the underlying adiposity and the development of metabolic syndrome in men with spinal cord injury (SCI). DESIGN: Case-control, cross-sectional study. SETTING: Community-based individuals with spinal cord injury and healthy controls. PARTICIPANTS: Twenty men with SCI age, height and weight matched with 20 able-bodied controls...
January 10, 2018: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/29319180/wisp1-promotes-non-alcoholic-fatty-liver-disease-and-skeletal-muscle-insulin-resistance-via-tlr4-jnk-signaling
#7
Tae Woo Jung, Changmuk Kang, Jiwon Goh, Soo In Chae, Hyoung-Chun Kim, Tae Jin Lee, A M Abd El-Aty, Ji Hoon Jeong
Wnt1-inducible signaling pathway protein-1 (WISP1) is a Cyr61/CTGF/NOV (CCN) family matricellular protein involved in adipogenesis and low-grade inflammation in obesity. However, the roles of WISP1 in hepatic steatosis and insulin resistance in skeletal muscle remain elusive. Mouse primary hepatocytes and differentiated mouse skeletal muscle cells (C2C12) were treated with various concentrations of WISP1 and the functions and signaling pathways were analyzed by Western blot analysis. In vivo transfection for WISP1 knockdown was also performed to examine the effects of WISP1 on hepatic steatosis and skeletal muscle insulin resistance...
January 10, 2018: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29311481/a-ppar-pan-agonist-mhy2013-alleviates-age-related-hepatic-lipid-accumulation-by-promoting-fatty-acid-oxidation-and-suppressing-inflammation
#8
Hye Jin An, Bonggi Lee, Seong Min Kim, Dae Hyun Kim, Ki Wung Chung, Su Gyeong Ha, Kyung Chul Park, Yeo Jin Park, Seong Jin Kim, Hwi Young Yun, Pusoon Chun, Byung Pal Yu, Hyung Ryong Moon, Hae Young Chung
Nonalcoholic fatty liver disease (NAFLD) is frequently observed in obese and aged individuals. Peroxisome proliferator-activated receptors (PPARs) play a role in regulating hepatic lipid accumulation, a hallmark of NAFLD development. A PPAR pan agonist, 2-(4-(5,6-methylenedioxybenzo[d]thiazol-2-yl)-2-methylphenoxy)-2-methylpropanoic acid (MHY2013) has been shown to prevent fatty liver formation and insulin resistance in obese mice (db/db) model. However, the beneficial effects of MHY2013 in aged model remain unknown...
2018: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29305303/alliin-attenuates-1-3-dichloro-2-propanol-induced-lipogenesis-in-hepg2-cells-through-activation-of-the-amp-activated-protein-kinase-dependent-pathway
#9
Jing Lu, Bijun Cheng, Zhuoqun Meng, Baochen Fang, Tianjiao Li, Maocheng Sun, Meitong Liu, Shuang Guan
Accumulating evidence reveals the association of 1, 3-dichloro-2-propanol (1, 3-DCP) exposure and lipogenesis. Alliin, the most abundant sulphur compound in garlic, has been demonstrated to exhibit hypoglycemic, antioxidant and anti-inflammatory activities. Here, we showed that alliin attenuated lipogenesis induced by 1,3-DCP and that the reduction was due to activation of the AMPK pathway. HepG2 cells exposed to 1,3-DCP exhibited significant increase of triglyceride(TG) and total cholesterol(TC), and alliin reduced the accumulation...
January 2, 2018: Life Sciences
https://www.readbyqxmd.com/read/29302209/histone-deacetylase-inhibition-attenuates-hepatic-steatosis-in-rats-with-experimental-cushing-s-syndrome
#10
Mina Kim, Hae-Ahm Lee, Hyun-Min Cho, Seol-Hee Kang, Eunjo Lee, In Kyeom Kim
Cushing's syndrome (CS) is a collection of symptoms caused by prolonged exposure to excess cortisol. Chronically elevated glucocorticoid (GC) levels contribute to hepatic steatosis. We hypothesized that histone deacetylase inhibitors (HDACi) could attenuate hepatic steatosis through glucocorticoid receptor (GR) acetylation in experimental CS. To induce CS, we administered adrenocorticotropic hormone (ACTH; 40 ng/kg/day) to Sprague-Dawley rats by subcutaneous infusion with osmotic mini-pumps. We administered the HDACi, sodium valproate (VPA; 0...
January 2018: Korean Journal of Physiology & Pharmacology
https://www.readbyqxmd.com/read/29295591/leonurus-japonicus-houtt-attenuates-nonalcoholic-fatty-liver-disease-in-free-fatty-acid-induced-hepg2-cells-and-mice-fed-a-high-fat-diet
#11
Mi-Ra Lee, Kwang Il Park, Jin Yeul Ma
We investigated the effects of a Leonurus japonicus ethanol extract (LJE) on nonalcoholic fatty liver disease (NAFLD). An in vitro model of hepatic steatosis was treated with 1 mM free fatty acid (FFA) in HepG2 cells. An in vivo NAFLD model was established using C57BL/6 mice fed a high-fat diet (HFD) and administered LJE (100 or 200 mg/kg) orally for 14 weeks. LJE treatment suppressed lipid accumulation and intracellular triglyceride levels significantly in a concentration-dependent manner in HepG2 cells. Moreover, LJE significantly reduced the expression of sterol regulatory element binding protein 1-c, and its downstream genes, which are associated with lipogenesis, in HepG2 cells...
December 25, 2017: Nutrients
https://www.readbyqxmd.com/read/29290620/pharmacological-stimulation-of-p53-with-low-dose-doxorubicin-ameliorates-diet-induced-nonalcoholic-steatosis-and-steatohepatitis
#12
Begoña Porteiro, Marcos F Fondevila, Xabier Buque, Maria J Gonzalez-Rellan, Uxia Fernandez, Alfonso Mora, Daniel Beiroa, Ana Senra, Rosalia Gallego, Johan Fernø, Miguel López, Guadalupe Sabio, Carlos Dieguez, Patricia Aspichueta, Rubén Nogueiras
OBJECTIVE: Recent reports have implicated the p53 tumor suppressor in the regulation of lipid metabolism. We hypothesized that the pharmacological activation of p53 with low-dose doxorubicin, which is widely used to treat several types of cancer, may have beneficial effects on nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH). METHODS: We used long-term pharmacological activation of p53 by i.p. or oral administration of low-dose doxorubicin in different animal models of NAFLD (high fat diet containing 45% and 60% kcal fat) and NASH (methionine- and choline-deficient diet and choline deficiency combined with high fat diet)...
December 15, 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29286302/microrna-27b-depletion-enhances-endotrophic-and-intravascular-lipid-accumulation-and-induces-adipocyte-hyperplasia-in-zebrafish
#13
Chia-Chun Hsu, Chi-Yu Lai, Chiu-Ya Lin, Kun-Yun Yeh, Guor Mour Her
miR-27b has emerged as a regulatory hub in cholesterol and lipid metabolism, and as a potential therapeutic target for treating atherosclerosis and obesity. However, the impact of miR-27b on lipid levels in vivo remains to be determined. Zebrafish lipids are normally stored as triacylglycerols (TGs) and their main storage sites are visceral, intramuscular, and subcutaneous lipid depots, and not blood vessels and liver. In this study, we applied microRNA-sponge (miR-SP) technology and generated zebrafish expressing transgenic miR-27b-SP (C27bSPs), which disrupted endogenous miR-27b activity and induced intravascular lipid accumulation (hyperlipidemia) and the early onset of nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH)...
December 29, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29278834/sugar-sensing-by-chrebp-mondo-mlx-new-insight-into-downstream-regulatory-networks-and-integration-of-nutrient-derived-signals
#14
REVIEW
Essi Havula, Ville Hietakangas
Animals regulate their physiology with respect to nutrient status, which requires nutrient sensing pathways. Simple carbohydrates, sugars, are sensed by the basic-helix-loop-helix leucine zipper transcription factors ChREBP/Mondo, together with their heterodimerization partner Mlx, which are well-established activators of sugar-induced lipogenesis. Loss of ChREBP/Mondo-Mlx in mouse and Drosophila leads to sugar intolerance, that is, inability to survive on sugar containing diet. Recent evidence has revealed that ChREBP/Mondo-Mlx responds to sugar and fatty acid-derived metabolites through several mechanisms and cross-connects with other nutrient sensing pathways...
December 23, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/29274966/fetuin-a-a-negative-acute-phase-protein-linked-to-adipose-tissue-function-in-periparturient-dairy-cows
#15
Clarissa Strieder-Barboza, Jonas de Souza, William Raphael, Adam L Lock, G Andres Contreras
Fetuin-A (FetA) is a free fatty acid transporter and an acute-phase protein that enhances cellular lipid uptake and lipogenesis. In nonruminants, FetA is involved in lipid-induced inflammation. Despite FetA importance in lipid metabolism and inflammation, its expression and dynamics in adipose tissue (AT) of dairy cows are unknown. The objectives of this study were to (1) determine serum and AT FetA dynamics over the periparturient period and in mid-lactation cows in negative energy balance (NEB) after a feed restriction protocol and (2) characterize how an inflammatory challenge affects adipocyte FetA expression...
December 20, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/29273476/gasdermin-d-plays-a-key-role-as-a-pyroptosis-executor-of-non-alcoholic-steatohepatitis-in-humans-and-mice
#16
Bing Xu, Mingzuo Jiang, Yi Chu, Weijie Wang, Di Chen, Xiaowei Li, Zhao Zhang, Di Zhang, Daiming Fan, Yongzhan Nie, Feng Shao, Kaichun Wu, Jie Liang
BACKGROUND & AIMS: Gasdermin D (GSDMD)-executed programmed necrosis is involved in inflammation and controls interleukin (IL)-1β release. However, the role of GSDMD in non-alcoholic steatohepatitis (NASH) remains unclear. We investigated the role of GSDMD in the pathogenesis of steatohepatitis. METHODS: Human liver tissues of non-alcoholic fatty liver disease (NAFLD) patients and control subjects were obtained to evaluate GSDMD expression. GSDMD knockout (GSDMD-/-) mice, obese db/db mice and their wild-type (WT) littermates were fed with methionine-and-choline-deficient (MCD) or control diet to induce steatohepatitis...
December 19, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/29258509/chemotherapy-diminishes-lipid-storage-capacity-of-adipose-tissue-in-a-preclinical-model-of-colon-cancer
#17
Maryam Ebadi, Catherine J Field, Richard Lehner, Vera C Mazurak
BACKGROUND: Accelerated loss of adipose tissue in cancer is associated with shorter survival, and reduced quality of life. Evidence is emerging suggesting tumour association with alterations in adipose tissue, but much less is known about drug-related mechanisms contributing to adipose atrophy. Identification of mechanisms by which tumour and cancer treatments, such as chemotherapy, affect adipose tissue are required to develop appropriate therapeutic interventions to prevent fat depletion in cancer...
December 19, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/29251622/-the-chemerin-production-changes-in-obese-patients-with-different-carbohydrate-metabolism-state
#18
M A Vasilenko, E V Kirienkova, D A Skuratovskaya, P A Zatolokin, N I Mironyuk, L S Litvinova
Chemerin is a mediator of adipose tissue involved in the regulation of many processes, including lipogenesis, and inflammatory response. The role of chemerin in the development of insulin resistance has been insufficiently studied and needs detailed understanding. The aim of the study was to investigate chemerin production in obese patients with different states of carbohydrate metabolism. The study included 155 patients with a diagnosis of obesity; 34 patients with overweight. The control group 1 consisted of 43 conditionally healthy donors who did not have obesity...
November 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/29249968/purinergic-receptors-in-adipose-tissue-as-potential-targets-in-metabolic-disorders
#19
REVIEW
Marco Tozzi, Ivana Novak
Extracellular nucleosides and nucleotides, such as adenosine and adenosine triphosphate (ATP), are involved in many physiological and pathological processes in adipose tissue (AT). It is becoming accepted that, in addition to the well-established sympathetic and hormonal system, purinergic receptors contribute significantly to regulation of adipocyte functions. Several receptor subtypes for both adenosine (P1) and ATP (P2X and P2Y) have been characterized in white adipocytes (WA) and brown adipocytes (BA). The effects mediated by adenosine and ATP on adipocytes are multiple and often differing, depending on specific receptors activated...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29249532/omega-3-pufa-modulate-lipogenesis-er-stress-and-mitochondrial-dysfunction-markers-in-nash-proteomic-and-lipidomic-insight
#20
Lívia Samara Dos Reis Rodrigues Okada, Claudia P Oliveira, José Tadeu Stefano, Monize Aydar Nogueira, Ismael Dale Cotrim Guerreiro da Silva, Fernanda Bertucce Cordeiro, Venâncio Avancini Ferreira Alves, Raquel Susana Torrinhas, Flair José Carrilho, Puneet Puri, Dan L Waitzberg
BACKGROUND & AIMS: Currently there is no FDA-approved therapy for nonalcoholic steatohepatitis (NASH). Increased n-6/n-3 polyunsaturated fatty acids (PUFA) ratio can induce endoplasmic reticulum (ER) stress and mitochondrial dysfunction that characterize NASH. Our recent study with n-3 PUFA showed improvement in individual histologic parameters like steatosis, ballooning and lobular inflammation. We hypothesized that n-3 PUFA therapy mediated improvement in histologic parameters is modulated by lipidomic and proteomic changes...
September 7, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
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