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https://www.readbyqxmd.com/read/28627440/microrna-21-regulates-hepatic-glucose-metabolism-by-targeting-foxo1
#1
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...
June 13, 2017: Gene
https://www.readbyqxmd.com/read/28620582/physicochemical-and-nutritional-requirements-for-axenic-replication-suggest-physiological-basis-for-coxiella-burnetii-niche-restriction
#2
Eduardo Vallejo Esquerra, Hong Yang, Savannah E Sanchez, Anders Omsland
Bacterial obligate intracellular parasites are clinically significant animal and human pathogens. Central to the biology of these organisms is their level of adaptation to intracellular replication niches associated with physicochemical and nutritional constraints. While most bacterial pathogens can adapt to a wide range of environments, severe niche restriction-an inability to thrive in diverse environments-is a hallmark of bacterial obligate intracellular parasites. Herein the physicochemical and nutritional factors underlying the physiological basis for niche restriction in the zoonotic bacterial obligate intracellular parasite and Q fever agent Coxiella burnetii are characterized...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28611150/effects-of-stress-during-pregnancy-on-hepatic-glucogenic-capacity-in-rat-dams-and-their-fetuses
#3
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/28607575/spatholobus-suberectus-exhibits-antidiabetic-activity-in-vitro-and-in-vivo-through-activation-of-akt-ampk-pathway
#4
Peijun Zhao, Md Badrul Alam, Seok-Hyun Lee, Young-Jun Kim, Seul Lee, Hongyan An, Hee-Jeong Choi, Hyeong-U Son, Chul-Hong Park, Hyo-Hyun Kim, Sang-Han Lee
Glucose deposition in peripheral tissue is an important parameter for the treatment of type 2 diabetes mellitus. The aim of this study was to investigate the effects of Spatholobus suberectus (Ss) on glucose disposal in skeletal muscle cells and additionally explore its in vivo antidiabetic potential. Treatment of ethanolic extract of S. suberectus (EeSs) significantly enhanced the glucose uptake, mediated through the enhanced expression of GLUT4 in skeletal muscle via the stimulation of AKT and AMPK pathways in C2C12 cells...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28589315/effect-of-blood-glucose-level-on-acute-stress-response-of-grass-carp-ctenopharyngodon-idella
#5
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/28586124/shp-deletion-prevents-hepatic-steatosis-and-when-combined-with-fxr-loss-protects-against-type-2-diabetes
#6
Oludemilade Akinrotimi, Ryan Riessen, Philip VanDuyne, Jung Eun Park, Yoon Kwang Lee, Lee-Jun Wong, Ann M Zavacki, Kristina Schoonjans, Sayeepriyadarshini Anakk
Nuclear receptors Farnesoid X Receptor (FXR) and Small Heterodimer Partner (SHP) are important regulators of bile acid, lipid and glucose homeostasis. Here we show that global Fxr (-/-) Shp(-/-) double knockout (DKO) mice are refractory to weight gain, glucose intolerance and hepatic steatosis when challenged with high-fat diet. DKO mice display an inherently increased capacity to burn fat and suppress de novo hepatic lipid synthesis. Moreover, DKO mice are also very active and that correlates well with the observed increase in Pepck expression, type IA fibers and mitochondrial function in the skeletal muscle...
June 6, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28565878/ginsenoside-rb3-strengthens-the-hypoglycemic-effect-through-ampk-for-inhibition-of-hepatic-gluconeogenesis
#7
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
#8
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...
June 1, 2017: Obesity Facts
https://www.readbyqxmd.com/read/28555305/differential-regulation-of-glyceroneogenesis-by-glucocorticoids-in-epididymal-and-retroperitoneal-white-adipose-tissue-from-rats
#9
Graziella Nascimento Ferreira, Rafael Rossi-Valentim, Samyra Lopes Buzelle, Sílvia Paula-Gomes, Neusa Maria Zanon, Maria Antonieta Rissato Garófalo, Danúbia Frasson, Luiz Carlos Carvalho Navegantes, Valéria Ernestânia Chaves, Isis do Carmo Kettelhut
PURPOSE: Investigate the glycerol-3-phosphate generation pathways in epididymal (EPI) and retroperitoneal (RETRO) adipose tissues from dexamethasone-treated rats. METHODS: Rats were treated with dexamethasone for 7 days. Glycerol-3-phosphate generation pathways via glycolysis, glyceroneogenesis and direct phosphorylation of glycerol were evaluated, respectively, by 2-deoxyglucose uptake, phosphoenolpyruvate carboxykinase (PEPCK-C) activity and pyruvate incorporation into triacylglycerol (TAG)-glycerol, and glycerokinase activity and glycerol incorporation into TAG-glycerol...
May 29, 2017: Endocrine
https://www.readbyqxmd.com/read/28522991/brachyspira-hyodysenteriae-and-b-pilosicoli-proteins-recognized-by-sera-of-challenged-pigs
#10
Vanessa Casas, Arantza Rodríguez-Asiain, Roberto Pinto-Llorente, Santiago Vadillo, Montserrat Carrascal, Joaquin Abian
The spirochetes Brachyspira hyodysenteriae and B. pilosicoli are pig intestinal pathogens that are the causative agents of swine dysentery (SD) and porcine intestinal spirochaetosis (PIS), respectively. Although some inactivated bacterin and recombinant vaccines have been explored as prophylactic treatments against these species, no effective vaccine is yet available. Immunoproteomics approaches hold the potential for the identification of new, suitable candidates for subunit vaccines against SD and PIS. These strategies take into account the gene products actually expressed and present in the cells, and thus susceptible of being targets of immune recognition...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28515141/glucagon-induced-extracellular-camp-regulates-hepatic-lipid-metabolism
#11
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
#12
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/28499851/effects-of-nutritional-history-on-stress-response-in-gibel-carp-carassius-auratus-gibelio-and-largemouth-bass-micropterus-salmoides
#13
Danli Jiang, Yubo Wu, Di Huang, Xing Ren, Yan Wang
The stress response of omnivorous gibel carp (Carassius auratus gibelio) and carnivorous largemouth bass (Micropterus salmoides) with different nutritional history were evaluated. A 2×2 layout, including two fish species (gibel carp or largemouth bass) and two nutritional history (fasted or fed to satiation for four weeks), was used. After feeding or fasting, the fishes were subjected to an acute handling. Fasting resulted in decrease of plasma glucose level and liver glycogen content of gibel carp and largemouth bass...
May 10, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28487991/blood-glycemia-modulating-effects-of-melanian-snail-protein-hydrolysates-in-mice-with-type%C3%A2-ii-diabetes
#14
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
https://www.readbyqxmd.com/read/28485262/biological-significance-of-phosphoenolpyruvate-carboxykinase-in-a-cestode-parasite-raillietina-echinobothrida-and-effect-of-phytoestrogens-on-the-enzyme-from-the-parasite-and-its-host-gallus-domesticus
#15
Ramnath, Asim Kumar Dutta, Barilin Dkhar, Veena Tandon, Bidyadhar DAS
Phosphoenolpyruvate carboxykinase (PEPCK) is involved in glycolysis in the cestode parasite, Raillietina echinobothrida; whereas, it executes a gluconeogenic role in its host, Gallus domesticus. Because of its differing primary function in the cestode parasite and its host, this enzyme is regarded as a plausible anthelmintic target. Hence, the biological significance of PEPCK in the parasite was analysed using siRNA against PEPCK from R. echinobothrida (RePEPCK). In order to find out the functional differences between RePEPCK and GdPEPCK (PEPCK from its host, G...
May 9, 2017: Parasitology
https://www.readbyqxmd.com/read/28483667/effect-of-brain-derived-neurotrophic-factor-bdnf-on-hepatocyte-metabolism
#16
Yoni Genzer, Nava Chapnik, Oren Froy
Brain-derived neurotrophic factor (BDNF) plays crucial roles in the development, maintenance, plasticity and homeostasis of the central and peripheral nervous systems. Perturbing BDNF signaling in mouse brain results in hyperphagia, obesity, hyperinsulinemia and hyperglycemia. Currently, little is known whether BDNF affects liver tissue directly. Our aim was to determine the metabolic signaling pathways activated after BDNF treatment in hepatocytes. Unlike its effect in the brain, BDNF did not lead to activation of the liver AKT pathway...
May 5, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28477305/long-term-obestatin-treatment-of-mice-type-2-diabetes-increases-insulin-sensitivity-and-improves-liver-function
#17
Paweł A Kołodziejski, Ewa Pruszyńska-Oszmałek, Mathias Z Strowski, Krzysztof W Nowak
PURPOSE: Obestatin and ghrelin are peptides encoded by the preproghrelin gene. Obestatin inhibits food intake, in addition to regulation of glucose and lipid metabolism. Here, we test the ability of obestatin at improving metabolic control and liver function in type 2 diabetic animals (type 2 diabetes mellitus). METHODS: The effects of chronic obestatin treatment of mice with experimentally induced type 2 diabetes mellitus on serum levels of glucose and lipids, and insulin sensitivity are characterized...
June 2017: Endocrine
https://www.readbyqxmd.com/read/28473467/hepatic-protein-phosphatase-1-regulatory-subunit-3b-ppp1r3b-promotes-hepatic-glycogen-synthesis-and-thereby-regulates-fasting-energy-homeostasis
#18
Minal B Mehta, Swapnil V Shewale, Raymond N Sequeira, John S Millar, Nicholas J Hand, Daniel J Rader
Maintenance of whole-body glucose homeostasis is critical to glycemic function. Genetic variants mapping to chromosome 8p23.1 in genome-wide association studies have been linked to glycemic traits in humans. The gene of known function closest to the mapped region, PPP1R3B (protein phosphatase 1 regulatory subunit 3B), encodes a protein (GL) that regulates glycogen metabolism in the liver. We therefore sought to test the hypothesis that hepatic PPP1R3B is associated with glycemic traits. We generated mice with either liver-specific deletion (Ppp1r3bΔhep) or liver-specific overexpression of Ppp1r3b...
May 4, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28431276/enzymatic-activity-gene-expression-and-posttranslational-modifications-of-photosynthetic-and-non-photosynthetic-phosphoenolpyruvate-carboxylase-in-ammonium-stressed-sorghum-plants
#19
Cirenia Arias-Baldrich, Clara de la Osa, Nadja Bosch, Isabel Ruiz-Ballesta, José A Monreal, Sofía García-Mauriño
Sorghum plants grown with 5mM (NH4)2SO4 showed symptoms of stress, such as reduced growth and photosynthesis, leaf chlorosis, and reddish roots. Phosphoenolpyruvate carboxylase (PEPC) activity, by supplying carbon skeletons for ammonium assimilation, plays a pivotal role in tolerance to ammonium stress. This work investigated the effect of ammonium nutrition on PPC and PPCK gene expression, on PEPC activity, and on post-translational modifications (PTMs) of PEPC in leaves and roots of sorghum plants. Ammonium increased PEPC kinase (PEPCk) activity and the phosphorylation state of PEPC in leaves, both in light and in the dark, due to increased PPCK1 expression in leaves...
July 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28429187/curcumin-reverses-the-depressive-like-behavior-and-insulin-resistance-induced-by-chronic-mild-stress
#20
Ji-Duo Shen, Yu Wei, Yu-Jie Li, Jing-Yi Qiao, Yu-Cheng Li
Increasing evidence has demonstrated that patients with depression have a higher risk of developing type 2 diabetes. Insulin resistance has been identified as the key mechanism linking depression and diabetes. The present study established a rat model of depression complicated by insulin resistance using a 12-week exposure to chronic mild stress (CMS) and investigated the therapeutic effects of curcumin. Sucrose intake tests were used to evaluate depressive-like behaviors, and oral glucose tolerance tests (OGTT) and intraperitoneal insulin tolerance tests (IPITT) were performed to evaluate insulin sensitivity...
April 21, 2017: Metabolic Brain Disease
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