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https://www.readbyqxmd.com/read/28804981/lipopolysaccharide-inhibits-hepatic-gluconeogenesis-in-rats-the-role-of-immune-cells
#1
Hiroshi Tanaka, Yoshikazu Nishikawa, Toru Fukushima, Ataru Taniguchi, Yoshihito Fujita, Kinsuke Tsuda, Nobuya Inagaki, Masaya Hosokawa
AIMS/INTRODUCTION: Bacterial septicemia has diverse clinical symptoms including severe hypoglycemia. However, sepsis-induced hypoglycemia has not yet been examined in detail. The aim of the present study is to investigate the mechanisms underlying hypoglycemia in sepsis. MATERIALS AND METHODS: We induced endotoxin shock in rats using lipopolysaccharide (LPS). After an intraperitoneal injection of LPS, we measured gluconeogenesis using the pyruvate tolerance test (PTT)...
August 14, 2017: Journal of Diabetes Investigation
https://www.readbyqxmd.com/read/28802581/pkm2-aggravates-palmitate-induced-insulin-resistance-in-hepg2-cells-via-stat3-pathway
#2
Ling Chen, Zhuqi Tang, Xiaohua Wang, Hong Ma, Dandan Shan, Shiwei Cui
Studies have identified that PKM2 is related to the development of glucose intolerance and insulin resistance in rodents and humans. However, the underlying mechanism remains largely unknown. In the present study, we found that PKM2 expression was significantly elevated in insulin-resistant hepatic tissues and hepatocytes, implicating an association between PKM2 expression and hepatic insulin resistance (IR). In vitro study revealed that overexpression of PKM2 impaired the insulin signaling pathway by decreasing the phosphorylation of protein kinase B (Akt) and glycogen synthase kinase-3β (GSK3β)...
August 9, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28799756/caffeic-acid-phenethyl-ester-propolis-extract-ameliorates-insulin-resistance-by-inhibiting-jnk-and-nf-%C3%AE%C2%BAb-inflammatory-pathways-in-diabetic-mice-and-hepg2-cells-models
#3
Jia-Rui Nie, Ya-Ning Chang, Yujia Li, Yingjun Zhou, Jiawen Qin, Zhen Sun, Haibin Li
Caffeic acid phenethyl ester (CAPE), extracted from propolis, was evaluated the ameliorative effects on insulin resistance and identified the mechanisms, using noninsulin-dependent diabetes mellitus (NIDDM) model mice and insulin resistance (IR) model cells. After 5-week of CAPE supplementation, insulin sensitivity, hyperlipidemia, and peroxisome proliferator-activated receptor-α (PPAR-α) levels were improved in mice. Pro-inflammatory cytokines in serum and the expressions of tumour necrosis factor- alpha (TNF-α) mRNA in tissues were markedly down-regulated from CAPE-treated mice...
August 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28751144/interplay-between-h6pdh-and-11%C3%AE-hsd1-implicated-in-the-pathogenesis-of-type-2-diabetes-mellitus
#4
Fan Yao, Li Chen, Zheng Fan, Fei Teng, Yali Zhao, Fengying Guan, Ming Zhang, Yanjun Liu
Extensive studies have been performed on the role of 11β-hydroxysteroid dehydrogenase 1 (11β-HSD1) in metabolic diseases. Our previous study reported glucose could directly regulate hexose-6-phosphate dehydrogenase (H6PDH) and 11β-HSD1. Recently, we further investigated the interplay of H6PDH and 11β-HSD1 and their roles in hepatic gluconeogenesis and insulin resistance to elucidate the importance of H6PDH and 11β-HSD1 in pathogenesis of type 2 diabetes mellitus (T2DM). T2DM rats model and H6PDH or 11β-HSD1 siRNA transfected in CBRH-7919 cells were used to explore the effect of H6PDH and 11β-HSD1 in T2DM...
July 15, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28727166/hepatocytes-contribute-to-residual-glucose-production-in-a-mouse-model-for-glycogen-storage-disease-type-ia
#5
Brenda S Hijmans, Andreas Boss, Theo H van Dijk, Maud Soty, Henk Wolters, Elodie Mutel, Albert K Groen, Terry G J Derks, Gilles Mithieux, Arend Heerschap, Dirk-Jan Reijngoud, Fabienne Rajas, Maaike H Oosterveer
It is a longstanding enigma how glycogen storage disease (GSD) type I patients retain a limited capacity for endogenous glucose production (EGP) despite the loss of glucose-6-phosphatase (G6Pase) activity. Insight into the source of residual EGP is of clinical importance given the risk of sudden death in these patients, but so far contradictory mechanisms have been proposed. We investigated G6Pase-independent EGP in hepatocytes isolated from a liver-specific GSD Ia mouse model (L-G6pc(-/-) mice), and performed real-time analysis of hepatic glucose fluxes and glycogen metabolism in L-G6pc(-/-) mice using state-of-the-art stable isotope methodologies...
July 20, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28724379/regulation-of-glucose-uptake-in-lymphoma-cell-lines-by-c-myc-and-pi3k-dependent-signaling-pathways-and-impact-of-glycolytic-pathways-on-cell-viability
#6
Martina Broecker-Preuss, Nina Becher-Boveleth, Andreas Bockisch, Ulrich Dührsen, Stefan Müller
BACKGROUND: Changes in glucose and energy metabolism contribute to the altered phenotype of cancer cells and are the basis for positron emission tomography with (18)F-fluoro-2-deoxy-D-glucose (FDG) to visualize tumors in vivo. The molecular background of the enhanced glucose uptake and its regulation in lymphoma cells is not fully clarified and may provide new possibilities to reverse the altered metabolism. Thus in this study we investigated regulation of glucose uptake by different signaling pathways...
July 19, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28678435/molecular-mechanisms-of-action-of-styrene-toxicity-in-blood-plasma-and-liver
#7
Kamal Niaz, Faheem Mabqool, Fazlullah Khan, Fatima Ismail Hassan, Maryam Baeeri, Mona Navaei-Nigjeh, Shokoufeh Hassani, Mahdi Gholami, Mohammad Abdollahi
Styrene is an aromatic colorless hydrocarbon available in liquid form and highly volatile. In its pure form, it gives a sweet smell. The primary source of exposure in the environment is from plastic materials, rubber industries, packaging materials, insulations, and fiber glass and carpet industry. Natural sources of styrene include: few metabolites in plants which are transferred through food chain. The current study was designed to evaluate styrene toxicity, including: superoxide dismutase (SOD) and protein carbonyl, oxidative stress, glucose-6-phosphatase (G6Pase), glycogen phosphorylase (GP), and phosphoenolpyruvate carboxykinase (PEPCK) activities, adenosine triphosphate (ATP) to adenosine diphosphate (ADP) ratio, and changes in gene expressions such as glutamate dehydrogenase 1 (GLUD1), glucose transporter 2 (GLUT2), and glucokinase (GCK) in the rat liver tissue...
July 5, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28627440/microrna-21-regulates-hepatic-glucose-metabolism-by-targeting-foxo1
#8
Ailing Luo, Haibo Yan, Jichao Liang, Chunyuan Du, Xuemei Zhao, Lijuan Sun, Yong Chen
Abnormal activation of hepatic gluconeogenesis is a major contributor to fasting hyperglycemia in type 2 diabetes; however, the potential role of microRNAs in gluconeogenesis remains unclear. Here, we showed that hepatic expression levels of microRNA-21 (miR-21) were decreased in db/db and high-fat diet (HFD)-induced diabetic mice. Adenovirus-mediated overexpression of miR-21 decreased the expression of phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (G6Pase) and inhibited glucose production in primary mouse hepatocytes...
September 5, 2017: Gene
https://www.readbyqxmd.com/read/28622511/metabolic-adaptation-establishes-disease-tolerance-to-sepsis
#9
Sebastian Weis, Ana Rita Carlos, Maria Raquel Moita, Sumnima Singh, Birte Blankenhaus, Silvia Cardoso, Rasmus Larsen, Sofia Rebelo, Sascha Schäuble, Laura Del Barrio, Gilles Mithieux, Fabienne Rajas, Sandro Lindig, Michael Bauer, Miguel P Soares
Sepsis is an often lethal syndrome resulting from maladaptive immune and metabolic responses to infection, compromising host homeostasis. Disease tolerance is a defense strategy against infection that preserves host homeostasis without exerting a direct negative impact on pathogens. Here, we demonstrate that induction of the iron-sequestering ferritin H chain (FTH) in response to polymicrobial infections is critical to establish disease tolerance to sepsis. The protective effect of FTH is exerted via a mechanism that counters iron-driven oxidative inhibition of the liver glucose-6-phosphatase (G6Pase), and in doing so, sustains endogenous glucose production via liver gluconeogenesis...
June 15, 2017: Cell
https://www.readbyqxmd.com/read/28611150/effects-of-stress-during-pregnancy-on-hepatic-glucogenic-capacity-in-rat-dams-and-their-fetuses
#10
Kathryn L Franko, Alison J Forhead, Abigail L Fowden
Stress during pregnancy is associated with metabolic dysfunction in the adult offspring in human and other animals. However, little is known about the metabolic effects of pregnancy stress on the mothers and fetuses during pregnancy itself. This study aimed to determine the consequences of the common experimental procedures of injection and single housing in pregnant rats on fetal and maternal hepatic glucogenic capacities. On day (D) 20 of pregnancy, feto-placental weights and the glycogen content and activities of phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (G6Pase) of fetal and maternal liver were measured in rats pair or single housed from D1 with or without saline injection from D15 to D19...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28589315/effect-of-blood-glucose-level-on-acute-stress-response-of-grass-carp-ctenopharyngodon-idella
#11
Danli Jiang, Yubo Wu, Di Huang, Xing Ren, Yan Wang
Stress has a considerable impact on welfare and productivity of fish, and blood glucose level of fish may be a factor modulating stress response. This study evaluated the effect of blood glucose level and handling on acute stress response of grass carp Ctenopharyngodon idella. Fish were intraperitoneally injected with glucose at 0, 0.2, 0.5, and 1.0 mg g(-1) body mass (BM) and then were exposed to handling for 5 min. Glucose injection resulted in increase of plasma glucose level and liver glycogen content and decrease of plasma lactate level...
June 6, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28565878/ginsenoside-rb3-strengthens-the-hypoglycemic-effect-through-ampk-for-inhibition-of-hepatic-gluconeogenesis
#12
Fanli Meng, Xiaotian Su, Wei Li, Yinan Zheng
Ginsenoside Rb3 is one of the major active components in protopanaxdiol type ginsenosides, and has demonstrated anti-diabetic activity. However, the mechanism of this action has yet to be elucidated. The present study investigated the effects of ginsenoside Rb3 on the AMP-activated protein kinase (AMPK) gluconeogenesis pathway. The present study involved the use of HepG2 cells and western blot analysis to systematically evaluate the effect of ginsenoside Rb3 on AMPK signaling proteins and key factors of gluconeogenesis [phosphoenolpyruvate carboxykinase (PEPCK), glucose-6-phosphatase, forkhead transcription factor 1 (FOXO1) and hepatic nuclear receptor 4α (HNF4α)]...
May 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28564652/roux-en-y-gastric-bypass-improves-hepatic-glucose-metabolism-involving-down-regulation-of-protein-tyrosine-phosphatase-1b-in-obese-rats
#13
Song Mu, Jiayu Liu, Wei Guo, Shuping Zhang, Xiaoqiu Xiao, Zhihong Wang, Jun Zhang
OBJECTIVE: This study was initiated to investigate the effects of Roux-en-Y gastric bypass (RYGB) surgery on hepatic glucose metabolism and hepatic expression of protein tyrosine phosphatase 1B (PTP1B) in obese rats. METHODS: Body weight, glucose, intraperitoneal glucose, insulin, and pyruvate tolerance tests were performed pre- and postoperatively, and plasma lipid, insulin and glucagon-like peptide 1 (GLP-1) were measured. The mRNA levels of G6Pase, Pepck, Gsk-3β and Gys-2, and the expression levels of PTP1B mRNA, protein, and other components of the insulin signaling pathway were measured by using RT-PCR and western blotting...
2017: Obesity Facts
https://www.readbyqxmd.com/read/28558013/downregulation-of-sirt1-signaling-underlies-hepatic-autophagy-impairment-in-glycogen-storage-disease-type-ia
#14
Jun-Ho Cho, Goo-Young Kim, Chi-Jiunn Pan, Javier Anduaga, Eui-Ju Choi, Brian C Mansfield, Janice Y Chou
A deficiency in glucose-6-phosphatase-α (G6Pase-α) in glycogen storage disease type Ia (GSD-Ia) leads to impaired glucose homeostasis and metabolic manifestations including hepatomegaly caused by increased glycogen and neutral fat accumulation. A recent report showed that G6Pase-α deficiency causes impairment in autophagy, a recycling process important for cellular metabolism. However, the molecular mechanism underlying defective autophagy is unclear. Here we show that in mice, liver-specific knockout of G6Pase-α (L-G6pc-/-) leads to downregulation of sirtuin 1 (SIRT1) signaling that activates autophagy via deacetylation of autophagy-related (ATG) proteins and forkhead box O (FoxO) family of transcriptional factors which transactivate autophagy genes...
May 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28523926/quantitative-evaluation-of-insulin-resistance-markers-in-pakistani-patients-suffering-from-hcv-associated-type-2-diabetes-mellitus
#15
S N Sabir, S Manzoor, F Parvaiz, M Saalim, E Ghani
The current study was designed to determine the role of the host genes involved in the development of chronic hepatitis C-associated type 2 diabetes mellitus. This study was carried out in patients in four different stages of chronic hepatitis C virus (HCV) infection, including treatment-naïve HCV patients, HCV-positive patients with type 2 diabetes mellitus (T2DM), non-responders and responders. The mRNA expression level of host genes, such as glucose-6-phosphatase (G6Pase), tumor necrosis factor α (TNF-α) and different adipokines including adiponectin, leptin and resistin, was quantified and compared to healthy controls...
2017: Acta Virologica
https://www.readbyqxmd.com/read/28516502/differential-effects-of-exposure-to-parasites-and-bacteria-on-stress-response-in-turbot-scophthalmus-maximus-simultaneously-stressed-by-low-water-depth
#16
J J Rodríguez-Quiroga, C Otero-Rodiño, P Suárez, T P Nieto, J M García Estévez, F San Juan, J L Soengas
The stress response of turbot Scophthalmus maximus was evaluated in fish maintained 8 days under different water depths, normal (NWD, 30 cm depth, total water volume 40 l) or low (LWD, 5 cm depth, total water volume 10 l), in the additional presence of infection-infestation of two pathogens of this species. This was caused by intraperitoneal injection of sublethal doses of the bacterium Aeromonas salmonicida subsp. salmonicida or the parasite Philasterides dicentrarchi (Ciliophora:Scuticociliatida)...
May 17, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28515141/glucagon-induced-extracellular-camp-regulates-hepatic-lipid-metabolism
#17
Sihan Lv, Xinchen Qiu, Jian Li, Jinye Liang, Weida Li, Chao Zhang, Zhenning Zhang, Bing Luan
Hormonal signals help to maintain glucose and lipid homeostasis in the liver during periods of fasting. Glucagon, a pancreas-derived hormone induced by fasting, promotes gluconeogenesis through induction of intracellular cAMP production. Glucagon also stimulates hepatic fatty acid oxidation but the underlying mechanism is poorly characterized. Here we reported that following the acute induction of gluconeogenic genes Glucose 6 phosphatase (G6Pase) and Phosphoenolpyruvate carboxykinase (Pepck) expression through CREB, glucagon triggers a second delayed phase of fatty acid oxidation genes Acyl-coenzyme A oxidase (Aox) and Carnitine palmitoyltransferase 1a (Cpt1a) expression via extracellular cAMP...
May 17, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28500893/glucagon-receptor-knockout-mice-are-protected-against-acute-olanzapine-induced-hyperglycemia
#18
Laura N Castellani, Willem T Peppler, Charles D Sutton, Jamie Whitfield, Maureen J Charron, David C Wright
OBJECTIVES: To determine if glucagon is involved in mediating the increase in blood glucose levels caused by the second-generation antipsychotic drug olanzapine. MATERIALS AND METHODS: Whole body glucagon receptor deficient mice (Gcgr(-/-)) or WT littermate controls were injected with olanzapine (5mg/kg BW IP) and changes in blood glucose measured over the following 120min. Separate cohorts of mice were treated with olanzapine and changes in pyruvate tolerance, insulin tolerance and whole body substrate oxidation were determined...
May 3, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28490809/hepatic-estrogen-receptor-%C3%AE-is-critical-for-regulation-of-gluconeogenesis-and-lipid-metabolism-in-males
#19
Shuiqing Qiu, Juliana Torrens Vazquez, Erin Boulger, Haiyun Liu, Ping Xue, Mehboob Ali Hussain, Andrew Wolfe
Impaired estrogens action is associated with features of the metabolic syndrome in animal models and humans. We sought to determine whether disruption of hepatic estrogens action in adult male mice could recapitulate aspects of the metabolic syndrome to understand the mechanistic basis for the phenotype. We found 17β-estradiol (E2) inhibited hepatic gluconeogenic genes such as phosphoenolpyruvate carboxykinase 1 (Pck-1) and glucose 6-phosphatase (G6Pase) and this effect was absent in mice lacking liver estrogen receptor α (Esr1) (LERKO mice)...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28487991/blood-glycemia-modulating-effects-of-melanian-snail-protein-hydrolysates-in-mice-with-type%C3%A2-ii-diabetes
#20
Jae-Suk Choi, Joo-Wan Kim, Jeong Been Park, Sang Eun Pyo, Yong-Ki Hong, Sae Kwang Ku, Mi-Ryung Kim
Freshwater animal proteins have long been used as nutrient supplements. In this study, melanian snail (Semisulcospira libertina) protein hydrolysates (MPh) were found to exert anti-diabetic and protective effects against liver and kidney damage in mice with type II diabetes adapted to a 45% kcal high-fat diet (HFD). The hypoglycemic, hepatoprotective and nephroprotective effects of MPh were analyzed after 12 weeks of the continuous oral administration of MPh at 125, 250 and 500 mg/kg. Diabetic control mice exhibited an increase in body weight, and blood glucose and insulin levels, with a decrease in serum high-density lipoprotein (HDL) levels...
June 2017: International Journal of Molecular Medicine
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