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liver fat content and insulin resistance

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https://www.readbyqxmd.com/read/29755549/evaluation-of-diabetogenic-mechanism-of-high-fat-diet-in-combination-with-arsenic-exposure-in-male-mice
#1
Akram Ahangarpour, Soheila Alboghobeish, Mohsen Rezaei, Mohammad Javad Khodayar, Ali Akbar Oroojan, Marzieh Zainvand
Obesity is a main reason of type 2 diabetes and also chronic exposure to arsenic (As) can produce diabetic symptoms. In previous studies, the association between high-fat diet and arsenic in the incidence of diabetes was found, but the role of beta cells activity, liver mitochondrial oxidative stress, and hepatic enzymes (leptin, adiponectin and beta amylase) was unclear. Thus, present study was conducted to evaluate the diabetogenic mechanism of arsenic followed by concomitant administration of high-fat diet (HFD) in male mice...
2018: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29755364/early-effects-of-a-low-fat-fructose-rich-diet-on-liver-metabolism-insulin-signaling-and-oxidative-stress-in-young-and-adult-rats
#2
Raffaella Crescenzo, Luisa Cigliano, Arianna Mazzoli, Rosa Cancelliere, Rosa Carotenuto, Margherita Tussellino, Giovanna Liverini, Susanna Iossa
The increase in the use of refined food, which is rich in fructose, is of particular concern in children and adolescents, since the total caloric intake and the prevalence of metabolic syndrome are increasing continuously in these populations. Nevertheless, the effects of high fructose diet have been mostly investigated in adults, by focusing on the effect of a long-term fructose intake. Notably, some reports evidenced that even short-term fructose intake exerts detrimental effects on metabolism. Therefore, the aim of this study was to compare the metabolic changes induced by the fructose-rich diet in rats of different age, i...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29739997/the-effect-of-high-fat-diet-and-metformin-treatment-on-liver-lipids-accumulation-and-their-impact-on-insulin-action
#3
Piotr Zabielski, Hady Razak Hady, Marta Chacinska, Kamila Roszczyc, Jan Gorski, Agnieszka U Blachnio-Zabielska
We sought to determine whether metformin treatment reverses a high-fat diet (HFD)-induced hepatic insulin resistance (IRes) and to identify lipid intermediates involved in induction of liver IRes. The experiments were conducted on male Wistar rats divided into three groups: 1. Control, 2. fed HFD and 3. fed HFD and treated with metformin. The animals were infused with a [U-13 C]palmitate to measure fractional lipid synthesis rate. This allowed for the calculation of fractional synthesis rate of signaling lipids (FSR) through the estimation of their isotopic enrichment...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29678923/eje-prize-2018-a-gut-feeling-about-glucagon
#4
Filip Krag Knop
Hyperglucagonaemia (in the fasting as well as in the postprandial state) is considered a core pathophysiological component of diabetes and to contribute substantially to the hyperglycaemic state of diabetes. Hyperglucagonaemia is usually viewed upon as a consequence of pancreatic alpha cell insensitivity to the glucagon-suppressive effects of glucose and insulin. Since we observed that the well-known hyperglucagonaemic response to oral glucose in patients with type 2 diabetes is exchanged by normal suppression of plasma glucagon levels following isoglycaemic intravenous glucose administration in these patients, we have been focusing on the gut and gut-derived factors as potential mediators of diabetic hyperglucagonaemia...
April 20, 2018: European Journal of Endocrinology
https://www.readbyqxmd.com/read/29678570/overexpression-of-nrk1-ameliorates-diet-and-age-induced-hepatic-steatosis-and-insulin-resistance
#5
Rui Fan, Jing Cui, Feng Ren, Qingzhi Wang, Yanmei Huang, Bin Zhao, Lai Wei, Xinlai Qian, Xiwen Xiong
NAD+ is a co-enzyme in redox reactions and a substrate required for activity of various enzyme families, including sirtuins and poly(ADP-ribose) polymerases. Dietary supplementation of NAD+ precursors nicotinamide mononucleotide (NMN) or nicotinamide riboside (NR) protects against metabolic disease, neurodegenerative disorders and age-related physiological decline in mammals. Here we sought to identify the roles of nicotinamide riboside kinase 1 (NRK1) plays in regulating hepatic NAD+ biosynthesis and lipid metabolism...
June 2, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29670844/the-eeffect-of-metformin-combined-with-calcium-vitamin-d-3-against-diet-induced-nonalcoholic-fatty-liver-disease
#6
Sara Shojaei Zarghani, Samin Abbaszadeh, Mohammad Alizadeh, Maryam Rameshrad, Alireza Garjani, Hamid Soraya
Purpose: Metformin is one of the most popular drugs tested against nonalcoholic fatty liver disease (NAFLD). The present study aimed to investigate whether calcium-vitamin D3 cosupplementation will intensify the effect of metformin on the prevention of high-fat, high-fructose (HFFr) diet-induced hepatic steatosis. Methods: Male wistar rats (210±16 g) were assigned into the following seven groups: a Control group to receive a standard chow and six HFFr-fed groups to receive diets containing either normal (0...
March 2018: Advanced Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29665034/metabolic-features-of-nonalcoholic-fatty-liver-nafl-in-obese-adolescents-findings-from-a-multi-ethnic-cohort
#7
Domenico Tricò, Sonia Caprio, Giuseppina Rosaria Umano, Bridget Pierpont, Jessica Nouws, Alfonso Galderisi, Grace Kim, Mariana M Mata, Nicola Santoro
AIMS: We conducted a prospective study in a large, multiethnic cohort of obese adolescents to characterize clinical and genetic features associated with pediatric Non-Alcoholic Fatty Liver (NAFL), the most common cause of chronic liver disease in youth. METHODS: A total of 503 obese adolescents were enrolled, including 191 (38.0%) Caucasians, 134 (26.6%) African Americans, and 178 (35.4%) Hispanics. Participants underwent abdominal magnetic resonance imaging (MRI) to quantify hepatic fat content, an oral glucose tolerance test to assess glucose tolerance and insulin sensitivity, and the genotyping of three SNPs associated with fatty liver (PNPLA3 rs738409, GCKR rs1260326, and TM6SF2 rs58542926)...
April 17, 2018: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29587769/circulating-osteopontin-and-its-association-with-liver-fat-content-in-non-obese-women-with-polycystic-ovary-syndrome-a-case-control-study
#8
Yuying Wang, Wei Zhou, Chunhua Wu, Yi Zhang, Tzuchun Lin, Yun Sun, Wei Liu, Tao Tao
BACKGROUND: Osteopontin (OPN) plays an important role in inflammatory processes and insulin resistance. Polycystic ovary syndrome (PCOS) is a reproductive metabolic disease associated with insulin resistance and metabolic abnormalities, including high levels of liver fat content (LFC). The objective of this study was to explore whether circulating OPN independently contributes to elevated LFC in non-obese PCOS patients. METHODS: This study included 61 non-obese PCOS patients and 56 age-matched healthy women from Shanghai, China...
March 27, 2018: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/29575149/exercise-decreases-clk2-in-the-liver-of-obese-mice-and-prevents-hepatic-fat-accumulation
#9
Vitor R Muñoz, Rafael C Gaspar, Gabriel K Kuga, Susana C B R Nakandakari, Igor L Baptista, Rania A Mekary, Adelino S R da Silva, Leandro P de Moura, Eduardo R Ropelle, Dennys E Cintra, José R Pauli
The accumulation of fatty acids in the liver associated with obesity condition is also known as nonalcoholic fatty liver disease (NAFLD). The impaired fat oxidation in obesity condition leads to increased hepatic fat accumulation and increased metabolic syndrome risk. On the other hand, physical exercise has been demonstrated as a potent strategy in the prevention of NAFLD. Also, these beneficial effects of exercise occur through different mechanisms. Recently, the Cdc2-like kinase (CLK2) protein was associated with the suppression of fatty acid oxidation and hepatic ketogenesis...
March 25, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29557265/chicoric-acid-mitigates-impaired-insulin-sensitivity-by-improving-mitochondrial-function
#10
Ji-Sun Kim, Hyunjung Lee, Chang Hwa Jung, Sung-Joon Lee, Tae-Youl Ha, Jiyun Ahn
Mitochondrial dysfunction is associated with insulin resistance. Although chicoric acid (CA) is known to have beneficial effects on insulin sensitivity, the involvement of mitochondrial function has not been elucidated yet. Here, we investigated the effect of CA on insulin resistance and mitochondrial dysfunction. In palmitate-induced insulin-resistant C2C12 myotubes, CA improved impaired glucose uptake and insulin signaling pathways, along with enhanced mitochondrial membrane potential and oxygen consumption...
March 20, 2018: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/29511669/ethanol-extract-from-ulva-prolifera-prevents-high-fat-diet-induced-insulin-resistance-oxidative-stress-and-inflammation-response-in-mice
#11
Wei Song, Zongling Wang, Xuelei Zhang, Yan Li
Ulva prolifera is the major causative species in the green tide, a serious marine ecological disaster, which bloomed in the Yellow Sea and the Bohai Sea of China. However, it is also a popular edible seaweed and its extracts exerts anti-inflammatory and antioxidant effects. The present study investigated the effects of ethanol extract of U. prolifera (EUP) on insulin sensitivity, inflammatory response, and oxidative stress in high-fat-diet- (HFD-) treated mice. HFD-treated mice obtained drinking water containing 2% or 5% EUP...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29498345/20-week-follow-up-of-hepatic-steatosis-installation-and-liver-mitochondrial-structure-and-activity-and-their-interrelation-in-rats-fed-a-high-fat-high-fructose-diet
#12
Gilles Fouret, Sylvie Gaillet, Jerome Lecomte, Beatrice Bonafos, Ferdinand Djohan, Bruno Barea, Eric Badia, Charles Coudray, Christine Feillet-Coudray
The incidence of obesity and its metabolic complications are rapidly increasing and become a major public health issue. This trend is associated with an increase in the prevalence of non-alcoholic fatty liver disease (NAFLD), insulin resistance and diabetes. The sequence of events leading to NAFLD progression and mitochondrial dysfunction and their interrelation remains to be elucidated. This study aimed to explore the installation and progression of NAFLD and its association with the liver mitochondrial structure and activity changes in rats fed an obesogenic diet up to 20 weeks...
February 2018: British Journal of Nutrition
https://www.readbyqxmd.com/read/29497783/angptl8-antisense-oligonucleotide-improves-adipose-lipid-metabolism-and-prevents-diet-induced-nafld-and-hepatic-insulin-resistance-in-rodents
#13
Daniel F Vatner, Leigh Goedeke, Joao-Paulo G Camporez, Kun Lyu, Ali R Nasiri, Dongyan Zhang, Sanjay Bhanot, Susan F Murray, Christopher D Still, Glenn S Gerhard, Gerald I Shulman, Varman T Samuel
AIMS/HYPOTHESIS: Targeting regulators of adipose tissue lipoprotein lipase could enhance adipose lipid clearance, prevent ectopic lipid accumulation and consequently ameliorate insulin resistance and type 2 diabetes. Angiopoietin-like 8 (ANGPTL8) is an insulin-regulated lipoprotein lipase inhibitor strongly expressed in murine adipose tissue. However, Angptl8 knockout mice do not have improved insulin resistance. We hypothesised that pharmacological inhibition, using a second-generation antisense oligonucleotide (ASO) against Angptl8 in adult high-fat-fed rodents, would prevent ectopic lipid accumulation and insulin resistance by promoting adipose lipid uptake...
June 2018: Diabetologia
https://www.readbyqxmd.com/read/29486138/nrf2-deletion-from-adipocytes-but-not-hepatocytes-potentiates-systemic-metabolic-dysfunction-after-long-term-high-fat-diet-induced-obesity-in-mice
#14
Dionysios V Chartoumpekis, Dushani L Palliyaguru, Nobunao Wakabayashi, Marco Fazzari, Nicholas Kh Khoo, Francisco J Schopfer, Ian Sipula, Yoko Yagishita, George K Michalopoulos, Robert M O'Doherty, Thomas W Kensler
Nrf2 is a canonical regulator of cytoprotective gene expression but evidence of its crosstalk with other pathways, including metabolic ones, is ever increasing. Pharmacologic or systemic genetic activation of the Nrf2 pathway partially protects from obesity in mice and ameliorates fasting hyperglycemia in mice and humans. However, systemic Nrf2 deletion also protected from diet-induced obesity and insulin resistance in mice. To further investigate the effect of the disruption of Nrf2 on obesity in a tissue-specific manner, we focused on adipocytes and hepatocytes with targeted deletion of Nrf2...
February 27, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29485130/the-rs626283-variant-in-the-mboat7-gene-is-associated-with-insulin-resistance-and-fatty-liver-in-caucasian-obese-youth
#15
Giuseppina R Umano, Sonia Caprio, Anna Di Sessa, Naga Chalasani, Daniel J Dykas, Bridget Pierpont, Allen E Bale, Nicola Santoro
OBJECTIVES: Non alcoholic fatty liver disease (NAFLD) is a leading cause of liver damage in childhood, its occurrence is influenced by genetic and environmental factors. Recently, the rs626283 polymorphism in the MBOAT7 gene has been found to be associated with alcoholic liver disease and NAFLD in adults. METHODS: In a multiethnic cohort of obese children and adolescents we genotyped the rs626283 polymorphism in the MBOAT7 gene, evaluated insulin sensitivity by an oral glucose tolerance test, and measured the intra-hepatic fat content (HFF%) by magnetic resonance imaging...
March 2018: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/29484808/effects-of-resveratrol-supplementation-on-liver-fat-content-in-overweight-and-insulin-resistant-subjects-a-randomized-double-blind-placebo-controlled-clinical-trial
#16
Konstantinos Kantartzis, Louise Fritsche, Maria Bombrich, Jürgen Machann, Fritz Schick, Harald Staiger, Iris Kunz, Rotraut Schoop, Angela Lehn-Stefan, Martin Heni, Andreas Peter, Andreas Fritsche, Hans-Ulrich Häring, Norbert Stefan
We performed the largest randomized, placebo-controlled clinical trial to date (N = 112, 12-week intervention) to investigate the effects and safety of resveratrol supplementation on liver fat content and cardiometabolic risk parameters in overweight and obese and insulin-resistant subjects. At baseline the variability in liver fat content was very large, ranging from 0.09% to 37.55% (median, 7.12%; interquartile range, 3.85%-12.94%). Mean (SD) liver fat content was 9.22 (6.85) % in the placebo group and 9...
February 27, 2018: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/29474930/prep1-deficiency-improves-metabolic-response-in-white-adipose-tissue
#17
Antonietta Liotti, Serena Cabaro, Ilaria Cimmino, Serena Ricci, Claudio Procaccini, Orlando Paciello, Gregory A Raciti, Rosa Spinelli, Susanna Iossa, Giuseppe Matarese, Claudia Miele, Pietro Formisano, Francesco Beguinot, Francesco Oriente
Prep1 is a gene encoding for a homeodomain transcription factor which induces hepatic and muscular insulin resistance. In this study, we show that Prep1 hypomorphic heterozygous (Prep1i/+ ) mice, expressing low levels of protein, featured a 23% and a 25% reduction of total body lipid content and epididymal fat, respectively. The percentage of the small adipocytes (25-75 μm) was 30% higher in Prep1i/+ animals than in the WT, with a reciprocal difference in the large adipose cells (100-150 and >150 μm)...
May 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29444588/periaortic-adipose-tissue-compared-with-peribrachial-adipose-tissue-mass-as-markers-and-possible-modulators-of-cardiometabolic-risk
#18
Elko Randrianarisoa, Norbert Stefan, Andreas Fritsche, Anja Hieronimus, Bernd Balletshofer, Jürgen Machann, Dorothea Siegel-Axel, Hans-Ulrich Häring, Kilian Rittig
Increased perivascular fat mass contributes to cardiometabolic risk (CMR). High peribrachial adipose tissue (PBAT) associates with insulin resistance independently of established CMR parameters. It is unknown to what extent periaortic adipose tissue (PAAT) may have a similar impact. In 95 participants, precise quantification of total adipose tissue, PBAT, PAAT, visceral adipose tissue (VAT), and liver fat (LF) content was performed by whole-body magnetic resonance imaging. Insulin sensitivity was determined by oral glucose tolerance test and carotid intima-media thickness (cIMT) by high-resolution ultrasound...
January 1, 2018: Angiology
https://www.readbyqxmd.com/read/29440695/combination-of-nutritional-polyphenols-supplementation-with-exercise-training-counteracts-insulin-resistance-and-improves-endurance-in-high-fat-diet-induced-obese-rats
#19
Karen Lambert, Marie Hokayem, Claire Thomas, Odile Fabre, Cécile Cassan, Annick Bourret, Florence Bernex, Christine Feuillet-Coudray, Cécile Notarnicola, Jacques Mercier, Antoine Avignon, Catherine Bisbal
Separately, polyphenols and exercise are known to prevent insulin resistance (IR) but their combined curative effects on established obesity and IR require further investigation. Therefore, we compared the metabolic effects of a combination of exercise and grape polyphenols supplementation in obese IR rats with high-fat diet (EXOPP) to the effect of high-fat diet alone (HF) or with a nutritional supplementation of grape polyphenols (PP) or with endurance exercise (EXO) during 8 wks. We observed an improvement of systemic and skeletal muscle insulin sensitivity in EXO and EXOPP rats...
February 13, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29425212/insulin-resistance-in-lean-and-overweight-non-diabetic-caucasian-adults-study-of-its-relationship-with-liver-triglyceride-content-waist-circumference-and-bmi
#20
Jorge Gonzalez-Cantero, Jose Luis Martin-Rodriguez, Alvaro Gonzalez-Cantero, Juan Pedro Arrebola, Jorge Luis Gonzalez-Calvin
AIMS: Insulin resistance is the pathophysiological precursor of type 2 diabetes mellitus (DM-2), and its relationship with non-alcoholic fatty liver disease (NAFLD) has been widely studied in patients with obesity or metabolic syndrome using not only ultrasound but also liver biopsies or proton magnetic resonance spectroscopy (H1-MRS) to assess liver fat content. In contrast, there are no studies on insulin resistance and NAFLD in lean or overweight Caucasian individuals using H1-MRS or liver biopsies for the quantification of hepatic triglyceride content...
2018: PloS One
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