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liver fat content and insulin resistance

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https://www.readbyqxmd.com/read/28106120/altered-glucose-and-lipid-homeostasis-in-liver-and-adipose-tissue-pre-dispose-inducible-nos-knockout-mice-to-insulin-resistance
#1
Babu Nageswararao Kanuri, Jitendra S Kanshana, Sanjay C Rebello, Priya Pathak, Anand P Gupta, Jiaur R Gayen, Kumaravelu Jagavelu, Madhu Dikshit
On the basis of diet induced obesity and KO mice models, nitric oxide is implied to play an important role in the initiation of dyslipidemia induced insulin resistance. However, outcomes using iNOS KO mice have so far remained inconclusive. The present study aimed to assess IR in iNOS KO mice after 5 weeks of LFD feeding by monitoring body composition, energy homeostasis, insulin sensitivity/signaling, nitrite content and gene expressions changes in the tissues. We found that body weight and fat content in KO mice were significantly higher while the respiratory exchange ratio (RER), volume of carbon dioxide (VCO2), and heat production were lower as compared to WT mice...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28096081/mice-with-hyperbilirubinemia-due-to-gilbert-s-syndrome-polymorphism-are-resistant-to-hepatic-steatosis-by-decreased-serine-73-phosphorylation-of-ppar%C3%AE
#2
Terry D Hinds, Peter A Hosick, Michael W Hankins, Andrea Nestor-Kalinoski, David E Stec
Gilbert's syndrome is derived from a polymorphism (TA repeat) in the hepatic UGT1A1 gene which results in decreased conjugation and increased levels of unconjugated bilirubin. Recently, we have shown that bilirubin binds directly to the fat burning nuclear peroxisome proliferator-activated receptor α (PPARα). Additionally, we have shown that serine 73 phosphorylation (Ser(P)(73)) of PPARα decreases activity by reducing its protein levels and transcriptional activity. The aim of this study was to determine if humanized mice with the Gilbert's polymorphism (HuUGT*28) have increased PPARα activation and reduced hepatic fat accumulation...
January 17, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28090342/-1-h-mrs-measured-ectopic-fat-in-liver-and-muscle-is-associated-with-the-metabolic-syndrome-in-danish-girls-but-not-in-boys-with-overweight-and-obesity
#3
A Nissen, C E Fonvig, E Chabanova, C Bøjsøe, C Trier, O Pedersen, T Hansen, H S Thomsen, J-C Holm
BACKGROUND: The metabolic syndrome (MetS) is a complication to overweight and obesity, which can be observed already in childhood. Ectopic lipid accumulation in muscle and liver has been shown to associate with the development of insulin resistance and dyslipidemia. Thus, the interaction between MetS and ectopic fat may offer clinical relevance. OBJECTIVES: To investigate the prevalence of MetS, or components hereof, and ectopic fat accumulation in liver and skeletal muscle tissue in children, as well as interactions between these...
December 2016: Obesity Science & Practice
https://www.readbyqxmd.com/read/28077863/what-have-human-experimental-overfeeding-studies-taught-us-about-adipose-tissue-expansion-and-susceptibility-to-obesity-and-metabolic-complications
#4
REVIEW
D J Cuthbertson, T Steele, J P Wilding, J C G Halford, J A Harrold, M Hamer, F Karpe
Overfeeding experiments, in which we impose short-term positive energy balance, help unravel the cellular, physiological and behavioural adaptations to nutrient excess. These studies mimic longer-term mismatched energy expenditure and intake. There is considerable inter-individual heterogeneity in the magnitude of weight gain when exposed to similar relative caloric excess reflecting variable activation of compensatory adaptive mechanisms. Significantly, given similar relative weight gain, individuals may be protected from/predisposed to metabolic complications (insulin resistance, dyslipidaemia, hypertension), non-alcoholic fatty liver disease and cardiovascular disease...
January 12, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28012248/sesamol-ameliorates-diet-induced-obesity-in-c57bl-6j-mice-and-suppresses-adipogenesis-in-3t3-l1-cells-via-regulating-mitochondria-lipid-metabolism
#5
Zhigang Liu, Qinglian Qiao, Yali Sun, Yuwei Chen, Bo Ren, Xuebo Liu
SCOPE: The aim of the current study was to investigate the effect of sesamol, a natural powerful antioxidant and anti-inflammatory phenol derivative of sesame oil, on adiposity and adiposity-related metabolic disturbances in mice fed with western diet, and the potential underlying mechanisms focusing on the mitochondria-lipid metabolism. METHODS & RESULTS: In the experimental model that consisted of 3 month-old C57BL/6J mice divided into 3 groups with/without sesamol in the drinking water including standard diet, high fat and high fructose diet (HFFD), and HFFD with sesamol...
December 24, 2016: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28005939/muscle-arnt-hif1%C3%AE-is-dispensable-in-myofiber-type-determination-vascularization-and-insulin-sensitivity
#6
Pierre-Marie Badin, Danesh H Sopariwala, Sabina Lorca, Vihang A Narkar
Aryl Hydrocarbon Receptor Nuclear Translocator/ hypoxia-inducible factor 1 beta (ARNT/ HIF1β), a member of bHLH-PAS family of transcriptional factors, plays a critical role in metabolic homeostasis, insulin resistance and glucose intolerance. The contributions of ARNT in pancreas, liver and adipose tissue to energy balance through gene regulation have been described. Surprisingly, the impact of ARNT signaling in the skeletal muscles, one of the major organs involved in glucose disposal, has not been investigated, especially in type II diabetes...
2016: PloS One
https://www.readbyqxmd.com/read/27959936/a-low-dose-of-dietary-quercetin-fails-to-protect-against-the-development-of-an-obese-phenotype-in-mice
#7
Reilly T Enos, Kandy T Velázquez, Meredith S Carson, Jamie L McClellan, Prakash Nagarkatti, Mitzi Nagarkatti, J Mark Davis, E Angela Murphy
The purpose of this study was to examine the effect of a 40% high-fat diet (HFD) supplemented with a dietary attainable level of quercetin (0.02%) on body composition, adipose tissue (AT) inflammation, Non-Alcoholic Fatty-Liver Disease (NAFLD), and metabolic outcomes. Diets were administered for 16 weeks to C57BL/6J mice (n = 10/group) beginning at 4 weeks of age. Body composition and fasting blood glucose, insulin, and total cholesterol concentrations were examined intermittently. AT and liver mRNA expression (RT-PCR) of inflammatory mediators (F4/80, CD206 (AT only), CD11c (AT only) TLR-2 (AT only), TLR-4 (AT only), MCP-1, TNF-α, IL-6 (AT only), and IL-10 (AT only)) were measured along with activation of NFκB-p65, and JNK (western blot)...
2016: PloS One
https://www.readbyqxmd.com/read/27941348/protective-effects-of-2-dodecyl-6-methoxycyclohexa-2-5-diene-1-4-dione-isolated-from-averrhoa-carambola-l-oxalidaceae-roots-on-high-fat-diet-induced-obesity-and-insulin-resistance-in-mice
#8
Juman Li, Xiaojie Wei, Qiuqiao Xie, Thi Thai Hoa Pham, Jinbin Wei, Ping He, Yang Jiao, Xiaohui Xu, Thi Huong Giang Nguyen, Qingwei Wen, Renbin Huang
BACKGROUND/AIMS: The roots of Averrhoa carambola L. (Oxalidaceae) have long been used as a traditional Chinese medicine for the treatment of diabetes and diabetes-related diseases. 2-dodecyl-6-methoxycycyclohexa-2,5-1,4-dione (DMDD) has been isolated from A. carambola L. roots, and this study was carried out to investigate the potential beneficial effects of DMDD on obesity and insulin resistance induced by a high-fat diet (HFD) in mice. METHODS: C57BL/6J mice were fed a HFD for 16 weeks and orally administered DMDD (12...
2016: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/27929200/obesity-insulin-resistance-rather-than-liver-fat-increases-coagulation-factor-activities-and-expression-in-humans
#9
Susanna Lallukka, Panu K Luukkonen, You Zhou, Elina M Petäjä, Marja Leivonen, Anne Juuti, Antti Hakkarainen, Marju Orho-Melander, Nina Lundbom, Vesa M Olkkonen, Riitta Lassila, Hannele Yki-Järvinen
Increased liver fat may be caused by insulin resistance and adipose tissue inflammation or by the common I148M variant in PNPLA3 at rs738409, which lacks both of these features. We hypothesised that obesity/insulin resistance rather than liver fat increases circulating coagulation factor activities. We measured plasma prothrombin time (PT, Owren method), activated partial thromboplastin time (APTT), activities of several coagulation factors, VWF:RCo and fibrinogen, and D-dimer concentration in 92 subjects divided into groups based on insulin sensitivity [insulin-resistant ('IR') versus insulin-sensitive ('IS')] and PNPLA3 genotype (PNPLA3(148MM/MI) vs PNPLA3(148II))...
December 8, 2016: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/27916988/circulating-scd36-levels-in-patients-with-non-alcoholic-fatty-liver-disease-and-controls
#10
S Heebøll, M K Poulsen, M J Ornstrup, T N Kjær, S B Pedersen, S Nielsen, H Grønbæk, A Handberg
BACKGROUND AND OBJECTIVE: CD36 is implicated in fatty acid uptake in multiple tissues, including hepatocytes and adipocytes. Circulating CD36 (sCD36) is increased in non-alcoholic fatty liver disease (NAFLD).We explored this association further by investigating correlations between sCD36 levels, intrahepatic lipid content and markers of obesity in NAFLD patients and controls. METHODS: 111 NAFLD patients and 33 normal/overweight controls were included. Intrahepatic lipid content was measured by MR spectroscopy; and subgroups of participants had a dual-energy X-ray absorptiometry (n=99), magnetic resonance imaging (n=94, subcutaneous and visceral adipose tissue) and liver biopsy (n=28 NAFLD patients) performed...
December 5, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27908430/evaluation-of-tissue-metal-and-trace-element-content-in-a-rat-model-of-non-alcoholic-fatty-liver-disease-using-icp-drc-ms
#11
Eugenia R Gatiatulina, Elizaveta V Popova, Valentina S Polyakova, Anastasia A Skalnaya, Eduard F Agletdinov, Alexandr A Nikonorov, Anatoly V Skalny, Alexey A Tinkov
The primary objective of the study was to assess the level of metals and trace elements in liver, serum, and hair of rats with diet-induced non-alcoholic fatty liver disease (NAFLD) using inductively coupled plasma dynamic reaction cell mass spectrometer (ICP-DRC-MS). 56 female 3-months-old Wistar rats divided into two equal groups were fed either standard (10% calories from fat) or high-fat high-carbohydrate diet (60% calories from fat in chow and 10% sucrose solution) for 6 weeks. Serum was examined for insulin resistance markers, lipid profile, and alanine aminotransferase (ALT) activity...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27906092/alterations-to-mtorc1-signaling-in-the-skeletal-muscle-differentially-affect-whole-body-metabolism
#12
Maitea Guridi, Barbara Kupr, Klaas Romanino, Shuo Lin, Denis Falcetta, Lionel Tintignac, Markus A Rüegg
BACKGROUND: The mammalian target of rapamycin complex 1 (mTORC1) is a central node in a network of signaling pathways controlling cell growth and survival. This multiprotein complex integrates external signals and affects different nutrient pathways in various organs. However, it is not clear how alterations of mTORC1 signaling in skeletal muscle affect whole-body metabolism. RESULTS: We characterized the metabolic phenotype of young and old raptor muscle knock-out (RAmKO) and TSC1 muscle knock-out (TSCmKO) mice, where mTORC1 activity in skeletal muscle is inhibited or constitutively activated, respectively...
March 21, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27798284/assessment-of-growth-and-metabolism-characteristics-in-offspring-of-dehydroepiandrosterone-induced-polycystic-ovary-syndrome-adults
#13
Ying Huang, Jiang-Man Gao, Chun-Mei Zhang, Hong-Cui Zhao, Yue Zhao, Rong Li, Yang Yu, Jie Qiao
Polycystic ovary syndrome (PCOS) is a common reproductive disorder that has many characteristic features including hyperandrogenemia, insulin resistance and obesity, which may have significant implications for pregnancy outcomes and long-term health of women. Daughters born to PCOS mothers constitute a high-risk group for metabolic and reproductive derangements, but no report has described potential growth and metabolic risk factors for such female offspring. Hence, we used a mouse model of dehydroepiandrosterone (DHEA)-induced PCOS to study the mechanisms underlying the pathology of PCOS by investigating the growth, developmental characteristics, metabolic indexes and expression profiles of key genes of offspring born to the models...
December 2016: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27794174/polyphenol-rich-virgin-olive-oil-reduces-insulin-resistance-and-liver-inflammation-and-improves-mitochondrial-dysfunction-in-high-fat-diet-fed-rats
#14
Adriano Lama, Claudio Pirozzi, Maria Pia Mollica, Giovanna Trinchese, Francesca Di Guida, Gina Cavaliere, Antonio Calignano, Giuseppina Mattace Raso, Roberto Berni Canani, Rosaria Meli
SCOPE: Virgin olive oil is an essential component of the Mediterranean diet. Its antioxidant and anti-inflammatory properties are mainly linked to phenolic contents. This study aims to evaluate the beneficial effects of a polyphenol-rich virgin olive oil (HPCOO) or olive oil without polyphenols (WPOO) in rats fed high-fat diet (HFD). METHODS AND RESULTS: Male Sprague-Dawley rats were divided into four groups based on the different types of diet: (I) standard diet (STD); (II) HFD; (III) HFD containing WPOO, and (IV) HFD containing HPCOO...
October 29, 2016: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/27784003/glycine-protects-against-high-sucrose-and-high-fat-induced-non-alcoholic-steatohepatitis-in-rats
#15
Xin Zhou, Dewu Han, Ruiling Xu, Huiwen Wu, Chongxiao Qu, Feng Wang, Xiangyu Wang, Yuanchang Zhao
We set out to explore the hypothesis that glycine attenuates non-alcoholic steatohepatitis (NASH) in rats and the possible mechanism by which is it does. Male Sprague-Dawley (SD) rats were fed a diet containing high fat and high sucrose (HSHF) for 24 weeks to induce NASH. Blood and liver tissues were sampled at selected time points throughout the study. Compared with control animals, the content of alanine transaminase (ALT), triglycerides (TGs), and free fatty acids (FFAs) in plasma and the TG and FFA content in the liver was increased from week 4 to 24...
October 23, 2016: Oncotarget
https://www.readbyqxmd.com/read/27754788/hepatic-glucocorticoid-receptor-plays-a-greater-role-than-adipose-gr-in-metabolic-syndrome-despite-renal-compensation
#16
Sandip K Bose, Irina Hutson, Charles A Harris
Exogenous glucocorticoid administration results in hyperglycemia, insulin resistance, hepatic dyslipidemia, and hypertension, a constellation of findings known as Cushing's syndrome. These effects are mediated by the glucocorticoid receptor (GR). Because GR activation in liver and adipose has been implicated in metabolic syndrome (MS), we wanted to determine the role of GR in these tissues in the development of MS. Because GR knockout (KO) mice (whole-body KO) exhibit perinatal lethality due to respiratory failure, we generated tissue-specific (liver or adipose) GRKO mice using cre-lox technology...
December 2016: Endocrinology
https://www.readbyqxmd.com/read/27753990/ed-05-2-interaction-of-gut-dysbiosis-and-innate-immune-dysfunction-in-the-development-of-metabolic-syndrome
#17
Myung-Shik Lee
Low-grade systemic inflammation in adipose tissues or liver, is an important etiologic factor in insulin resistance. LPS is an important element causing such metabolic inflammation, and intestinal flora is considered a major source of systemic LPS. We studied changes of intestinal microbiota associated with high-fat diet (HFD) that causes insulin resistance and metabolic stress. 16S rRNA gene sequencing showed that HFD significantly decreased the abundance of a mucin-degrading bacterium Akkermansia muciniphila compared to control diet...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27734103/mitochondria-related-transcriptional-signature-is-downregulated-in-adipocytes-in-obesity-a-study-of-young-healthy-mz-twins
#18
Sini Heinonen, Maheswary Muniandy, Jana Buzkova, Adil Mardinoglu, Amaia Rodríguez, Gema Frühbeck, Antti Hakkarainen, Jesper Lundbom, Nina Lundbom, Jaakko Kaprio, Aila Rissanen, Kirsi H Pietiläinen
AIMS/HYPOTHESIS: Low mitochondrial activity in adipose tissue is suggested to be an underlying factor in obesity and its metabolic complications. We aimed to find out whether mitochondrial measures are downregulated in obesity also in isolated adipocytes. METHODS: We studied young adult monozygotic (MZ) twin pairs discordant (n = 14, intrapair difference ΔBMI ≥ 3 kg/m(2)) and concordant (n = 5, ΔBMI < 3 kg/m(2)) for BMI, identified from ten birth cohorts of 22- to 36-year-old Finnish twins...
January 2017: Diabetologia
https://www.readbyqxmd.com/read/27732084/rabl2-is-required-for-hepatic-fatty-acid-homeostasis-and-its-dysfunction-leads-to-steatosis-and-a-diabetes-like-state
#19
Jennifer Chi Yi Lo, Anne E O'Connor, Zane B Andrews, Camden Lo, Tony Tiganis, Matthew J Watt, Moira K O'Bryan
Fatty liver, or hepatic steatosis, is an alarmingly common pathology in western societies, in large part because if left unheeded, it can lead to life-threatening forms of nonalcoholic fatty liver disease, including nonalcoholic steatohepatitis, fibrosis, cirrhosis, and hepatocellular carcinoma. As such, it is essential that we attain a greater understanding of the pathways that control energy partitioning in the liver and ultimately how they are impacted by environmental factors. Here, we define the essential requirement for a member of the Ras-related protein in the brain (RAB)-like (RABL) clade of small GTPases, RABL2, in fatty acid metabolism including in microtubule-associated mitochondrial movement within the liver...
December 2016: Endocrinology
https://www.readbyqxmd.com/read/27723801/evaluation-of-methionine-content-in-a-high-fat-and-choline-deficient-diet-on-body-weight-gain-and-the-development-of-non-alcoholic-steatohepatitis-in-mice
#20
Tsuyoshi Chiba, Sachina Suzuki, Yoko Sato, Tatsuki Itoh, Keizo Umegaki
AIM: Non-alcoholic steatohepatitis (NASH) is a globally recognized liver disease. A methionine- and choline-deficient diet is used to induce NASH in mice; however, this diet also causes severe body weight loss. To resolve this issue, we examined the effects of methionine content in a high-fat and choline-deficient (HFCD) diet on body weight and the development of NASH in mice. METHODS: C57BL/6J mice (male, 10 weeks of age) were fed an L-amino acid rodent (control) diet, high-fat (HF) diet, or HFCD diet containing various amounts of methionine (0...
2016: PloS One
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