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Gluconeogenesis

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https://www.readbyqxmd.com/read/27933176/pancreatic-%C3%AE-cell-hyperplasia-and-hyperglucagonemia-due-to-a-glucagon-receptor-splice-mutation
#1
Etienne Larger, Nicolai J Wewer Albrechtsen, Lars H Hansen, Richard W Gelling, Jacqueline Capeau, Carolyn F Deacon, Ole D Madsen, Fumiatsu Yakushiji, Pierre De Meyts, Jens J Holst, Erica Nishimura
: Glucagon stimulates hepatic glucose production by activating specific glucagon receptors in the liver, which in turn increase hepatic glycogenolysis as well as gluconeogenesis and ureagenesis from amino acids. Conversely, glucagon secretion is regulated by concentrations of glucose and amino acids. Disruption of glucagon signaling in rodents results in grossly elevated circulating glucagon levels but no hypoglycemia. Here, we describe a patient carrying a homozygous G to A substitution in the invariant AG dinucleotide found in a 3' mRNA splice junction of the glucagon receptor gene...
2016: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/27931035/diabetic-phenotype-in-the-small-intestine-of-zucker-diabetic-fatty-rats
#2
Henning Hvid, Stina Rikke Jensen, Brent M Witgen, Christian Fledelius, Jesper Damgaard, Charles Pyke, Thomas Bovbjerg Rasmussen
BACKGROUND/AIMS: In contrast to streptozotocin (STZ)-induced rodent models of diabetes, there are no thorough characterizations of the intestinal phenotype and the underlying changes in the global gene-expression of genetic models of diabetes, such as the Zucker diabetic fatty (ZDF) rat. The aim of the present study was to characterize the intestine in the ZDF rat. METHODS: The intestine of ZDF rats and lean controls was examined macroscopically and histologically, and ribonucleic acid sequencing (RNAseq) was performed in samples of jejunal mucosa...
December 9, 2016: Digestion
https://www.readbyqxmd.com/read/27929184/a-comparison-of-rs4-type-resistant-starch-to-rs2-type-resistant-starch-in-suppressing-oxidative-stress-in-high-fat-diet-induced-obese-rats
#3
Xu Si, Zhongkai Zhou, Padraig Strappe, Chris Blanchard
The anti-obesity effects of two types of resistant starch (RS) in high-fat-diet-induced obese rats were investigated. The serum triglycerides, total cholesterol and malondialdehyde concentrations were significantly reduced, and the total antioxidant capacity, superoxide dismutase levels and glutathione peroxidase activity were increased by RS2 and RS4 consumption compared to the obesity group. A significant reduction in the serum glucose level and elevations in hepatic lipid metabolic enzyme activities were observed only for RS4 administration...
December 8, 2016: Food & Function
https://www.readbyqxmd.com/read/27920276/studies-of-recombinant-twa1-reveal-constitutive-dimerisation
#4
Ore Francis, Genevieve E Baker, Paul R Race, Josephine C Adams
The mammalian muskelin/RanBP9/CTLH complex and the S. cerevisiae GID complex are large, multi-protein complexes that each contain a RING E3 ubiquitin ligase. The yeast GID complex acts to degrade a key enzyme of gluconeogenesis, fructose 1,6-bisphosphatase, under conditions of abundant fermentable carbon sources. However, the assembly and functions of the mammalian complex remain poorly understood. A striking feature of these complexes is the presence of multiple proteins that contain contiguous lissencephaly-1 homology (LisH), C-terminal to LisH (CTLH) and C-terminal CT11-RanBP9 (CRA) domains...
December 5, 2016: Bioscience Reports
https://www.readbyqxmd.com/read/27919820/tnf-%C3%AE-and-cancer-cachexia-molecular-insights-and-clinical-implications
#5
REVIEW
Hetal J Patel, Bhoomika M Patel
Cancer cachexia characterized by a chronic wasting syndrome, involves skeletal muscle loss and adipose tissue loss and resistance to conventional nutritional support. Cachexia is responsible for the reduction in quality and length of life of cancer patients. It also decreases the muscle strength of the patients. The pro-inflammatory and pro-cachectic factors produced by the tumor cells have important role in genesis of cachexia. A number of pro-inflammatory cytokines, like interleukin-1 (IL-1), IL-6, tumor necrosis factor- alpha (TNF-α) may have important role in the pathological mechanisms of cachexia in cancer...
December 2, 2016: Life Sciences
https://www.readbyqxmd.com/read/27916421/protective-potential-of-averrhoa-bilimbi-fruits-in-ameliorating-the-hepatic-key-enzymes-in-streptozotocin-induced-diabetic-rats
#6
Surya B Kurup, Mini S
BACK GROUND: Diabetes is a mutifactorial disease which leads to several complications. Currently available drug regimens for management of diabetes have certain drawbacks. Need for safer and effective medicines from natural sources having potent antidiabetic activity. Averrhoa bilimbi Linn. (Oxalidaceae) is a medicinal plant and is reported to possess hypoglycemic activity. OBJECTIVE: To investigate the antidiabetic potential of Averrhoa bilimbi fruit extract in streptozotocin-induced diabetic rats...
December 1, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27908734/triosephosphate-isomerase-1-suppresses-growth-migration-and-invasion-of-hepatocellular-carcinoma-cells
#7
Hao Jiang, Ning Ma, Yurong Shang, Wentao Zhou, Tianwei Chen, Dongxian Guan, Jingjing Li, Jingjing Wang, Erbin Zhang, Yuanyuan Feng, Fenfen Yin, Yanmei Yuan, Yuanyuan Fang, Lin Qiu, Dong Xie, Dongzhi Wei
Metabolic dysregulation is one of the most common and recognizable features of cancer. Triosephosphate isomerase 1 (TPI1), which catalyzes the interconversion of dihydroxyacetone phosphate (DHAP) and d-glyceraldehyde-3-phosphate (G3P) during glycosis and gluconeogenesis, is a crucial enzyme in the carbohydrate metabolism. However, the biological function and mechanism of TPI1 in cancer remain largely unknown. In this study, we have found that TPI1 expression was greatly decreased in clinical HCC samples, positively correlated with overall survival, and negatively associated with histological differentiation, tumor size and organ metastasis...
November 28, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27904436/effects-of-metformin-on-blood-and-urine-pro-inflammatory-mediators-in-patients-with-type-2-diabetes
#8
Wei Chen, Xiaojie Liu, Shandong Ye
BACKGROUND: Metformin has been used for the treatment of type 2 diabetes by suppressing hepatic gluconeogenesis. It has been shown that the subclinical inflammatory responses play important roles in the pathogenesis of type 2 diabetes. In the present study, we determined the effects of metformin on the levels of pro-inflammatory cytokines (i.e., IL-6, TNF-α, and MCP-1) and anti-inflammatory mediator IL-10 in blood and urine of patients with type 2 diabetes. There were 210 patients with type 2 diabetes, which were randomized into metformin (n = 112) and non-metformin (gliclazide, acarbose, and repaglinide, n = 98) groups...
2016: Journal of Inflammation
https://www.readbyqxmd.com/read/27903651/t-cells-encountering-myeloid-cells-programmed-for-amino-acid-dependent-immunosuppression-use-rictor-mtorc2-for-proliferative-checkpoint-decisions
#9
Lee-Ann Van de Velde, Chitra Subramanian, Amber M Smith, Luke Barron, Joseph E Qualls, Geoffrey Neale, Adolfo Alfonso-Pecchio, Suzanne Jackowski, Charles O Rock, Thomas A Wynn, Peter J Murray
Modulation of T cell proliferation and function by immunoregulatory myeloid cells is an essential means of preventing self-reactivity and restoring tissue homeostasis. Consumption of amino acids such as arginine and tryptophan by immunoregulatory macrophages is one pathway that suppresses local T cell proliferation. Using a reduced complexity in vitro macrophage: T cell co-culture system, we show that macrophage Arginase-1 (Arg1) is the only factor required by M2 macrophages to block T cells in G1, and this effect is mediated by L-arginine elimination rather than metabolite generation...
November 30, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27902743/itraq-based-quantitative-proteomic-analysis-of-spirulina-platensis-in-response-to-low-temperature-stress
#10
Qingye Li, Rong Chang, Yijun Sun, Bosheng Li
Low temperature (LT) is one of the most important abiotic stresses that can significantly reduce crop yield. To gain insight into how Spirulina responds to LT stress, comprehensive physiological and proteomic analyses were conducted in this study. Significant decreases in growth and pigment levels as well as excessive accumulation of compatible osmolytes were observed in response to LT stress. An isobaric tag for relative and absolute quantitation (iTRAQ)-based quantitative proteomics approach was used to identify changes in protein abundance in Spirulina under LT...
2016: PloS One
https://www.readbyqxmd.com/read/27902686/genomic-characterization-of-metformin-hepatic-response
#11
Marcelo R Luizon, Walter L Eckalbar, Yao Wang, Stacy L Jones, Robin P Smith, Megan Laurance, Lawrence Lin, Paul J Gallins, Amy S Etheridge, Fred Wright, Yihui Zhou, Cliona Molony, Federico Innocenti, Sook Wah Yee, Kathleen M Giacomini, Nadav Ahituv
Metformin is used as a first-line therapy for type 2 diabetes (T2D) and prescribed for numerous other diseases. However, its mechanism of action in the liver has yet to be characterized in a systematic manner. To comprehensively identify genes and regulatory elements associated with metformin treatment, we carried out RNA-seq and ChIP-seq (H3K27ac, H3K27me3) on primary human hepatocytes from the same donor treated with vehicle control, metformin or metformin and compound C, an AMP-activated protein kinase (AMPK) inhibitor (allowing to identify AMPK-independent pathways)...
November 2016: PLoS Genetics
https://www.readbyqxmd.com/read/27898966/postweaning-changes-in-the-expression-of-chemerin-and-its-receptors-in-calves-are-associated-with-the-modification-of-glucose-metabolism
#12
Y Suzuki, S Haga, M Nakano, H Ishizaki, M Nakano, S Song, K Katoh, S Roh
Chemerin, originally known as a chemoattractant derived from adipose tissue and the liver, has been reported to have regulatory functions in gluconeogenesis, peripheral insulin sensitivity, and insulin secretion. This study was conducted to assess the postweaning changes in expression of this cytokine and its physiological role in the modification of glucose metabolism associated with weaning. Eighteen tissue samples were collected from Holstein calves (90 d of age; n = 4) to investigate the tissue distributions of chemerin and its receptors genes...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27898934/an-insufficient-glucose-supply-causes-reduced-lactose-synthesis-in-lactating-dairy-cows-fed-rice-straw-instead-of-alfalfa-hay
#13
B Wang, F-Q Zhao, B-X Zhang, J-X Liu
The objective of the present study was to investigate the nutrient availability for milk production in the mammary gland of lactating cows fed different forage-based diets. The 3 diets contained 30% corn stover (CS), 30% rice straw (RS), or 23% alfalfa hay plus 7% Chinese wild rye hay (AH) as a forage source. All diets contained 15% of DM as corn silage and 55% of DM as concentrate. The percentage of milk lactose was always lower in the RS-fed cows than in the cows fed AH or CS during the 12-wk feeding trial ( < 0...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27897089/anti-aging-effect-of-metformin-on-brain-in-naturally-aged-and-accelerated-senescence-model-of-rat
#14
Geetika Garg, Sandeep Singh, Abhishek Kumar Singh, Syed Ibrahim Rizvi
Metformin, a biguanide, is a widely used anti-diabetic drug which inhibits gluconeogenesis and is used to treat hyperglycemia in type 2 diabetes. Through activation of AMPK pathway, metformin also mimics caloric restriction health benefits. Aging causes substantial molecular to morphological changes in brain, the brain cells being more susceptible towards oxidative stress mediated damages due to the presence of high lipid content and higher oxygen consumption. Wistar rats (naturally aged and D Galactose induced rat model) were supplemented with metformin (300 mg/kg b...
November 29, 2016: Rejuvenation Research
https://www.readbyqxmd.com/read/27895139/human-spermatozoa-quantitative-proteomic-signature-classifies-normo-and-asthenozoospermia
#15
Mayank Saraswat, Sakari Joenväärä, Tushar Jain, Anil Kumar Tomar, Ashima Sinha, Sarman Singh, Savita Yadav, Risto Renkonen
Scarcely understood defects lead to asthenozoospermia which results in poor fertility outcomes. Incomplete knowledge of these defects hinders the development of new therapies and reliance on interventional therapies, such as in vitro fertilization, increases. Sperm cells, being transcriptionally and translationally silent, necessitate the proteomic approach to study the sperm function. We have performed a differential proteomics analysis of human sperm and seminal plasma and identified and quantified 667 proteins in sperm and 429 proteins in seminal plasma dataset which were used for further analysis...
November 28, 2016: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/27894252/transcriptome-analysis-reveals-the-genetic-basis-underlying-the-seasonal-development-of-keratinized-nuptial-spines-in-leptobrachium-boringii
#16
Wei Zhang, Yue Guo, Jun Li, Li Huang, Eric Gilbert Kazitsa, Hua Wu
BACKGROUND: The expression of sexually selected traits often varies with populations' breeding cycles in many animals. The elucidation of mechanisms underlying the expression of such traits is a research topic in evolutionary biology; however, the genetic basis of the seasonal development of their expression remains unknown. Male Leptobrachium boringii develop keratinized nuptial spines on their upper jaw during the breeding season that fall off when the breeding season ends. To illuminate the genetic basis for the expression of this trait and its seasonal development, we assessed the de novo transcriptome for L...
November 28, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27893760/leaf-extract-from-lithocarpus-polystachyus-rehd-promote-glycogen-synthesis-in-t2dm-mice
#17
Jinfei Wang, Yumin Huang, Kaixiang Li, Yingying Chen, Diana Vanegas, Eric Scott McLamore, Yingbai Shen
The purpose of this study was to investigate the effects of leaf extract from Lithocarpus polystachyus Rehd. on type II diabetes mellitus (T2DM) and the active ingredients of this effect. In addition, this study determined, for the first time, the underlying molecular and pharmacological mechanisms of the extracts on hyperglycemia using long-term double high diet-fed and streptozotocin (STZ) induced type II diabetic mice. In the present study, leaf extract, phloridzin and trilobatin were assessed in vivo (gavage) and in vitro (non-invasive micro-test technique, NMT) in experimental T2DM mice...
2016: PloS One
https://www.readbyqxmd.com/read/27890887/royal-jelly-improves-hyperglycemia-in-obese-diabetic-kk-ay-mice
#18
Mei Yoshida, Kaori Hayashi, Risa Watadani, Yoshiyasu Okano, Keiya Tanimura, Jun Kotoh, Daiki Sasaki, Kozo Matsumoto, Akihiko Maeda
The study examined whether royal jelly (RJ) can prevent obesity and ameliorate hyperglycemia in type 2 diabetes. This study utilized obese/diabetic KK-Ay mice. RJ (10 mg/kg) was administered by oral gavage. Body weight, plasma glucose and insulin levels were measured. mRNA and protein levels were determined using quantitative reverse transcription polymerase chain reaction and western blotting, respectively. Four weeks of RJ administration improved hyperglycemia and partially suppressed body weight gain, although the latter effect did not reach statistical significance...
November 26, 2016: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/27886975/in-vitro-metabolic-engineering-of-bioelectricity-generation-by-the-complete-oxidation-of-glucose
#19
Zhiguang Zhu, Y-H Percival Zhang
The direct generation of electricity from the most abundant renewable sugar, glucose, is an appealing alternative to the production of liquid biofuels and biohydrogen. However, enzyme-catalyzed bioelectricity generation from glucose suffers from low yields due to the incomplete oxidation of the six-carbon compound glucose via one or few enzymes. Here, we demonstrate a synthetic ATP- and CoA-free 12-enzyme pathway to implement the complete oxidation of glucose in vitro. This pathway is comprised of glucose phosphorylation via polyphosphate glucokinase, NADH generation catalyzed by glucose 6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate dehydrogenase (6PGDH), electron transfer from NADH to the anode, and glucose 6-phosphate regeneration via the non-oxidative pentose phosphate pathway and gluconeogenesis...
November 23, 2016: Metabolic Engineering
https://www.readbyqxmd.com/read/27880981/a-novel-glucagon-like-peptide-1-glucagon-receptor-dual-agonist-improves-steatohepatitis-and-liver-regeneration-in-mice
#20
M Pilar Valdecantos, Virginia Pardo, Laura Ruiz, Luis Castro-Sánchez, Borja Lanzón, Elisa Fernández-Millán, Carmelo García-Monzón, Ana I Arroba, Águeda González-Rodríguez, Fernando Escrivá, Álvarez Carmen, Francisco J Rupérez, Coral Barbas, Anish Konkar, Jacqui Naylor, David Hornigold, Ana Dos Santos, Maria Bednarek, Joseph Grimsby, Cristina M Rondinone, Ángela M Valverde
BACKGROUND AND AIMS: Since non-alcoholic steatohepatitis (NASH) is associated with impaired liver regeneration, we investigated the effects of G49, a dual glucagon-like peptide-1(GLP-1)/glucagon (GCG) receptor agonist, on NASH and hepatic regeneration. METHODS: C57Bl/6 mice fed chow or methionine and choline-deficient (MCD) diet for one week were divided into 4 groups: C (chow diet), MCD (MCD diet), C+G49 (chow diet plus G49) and M+G49 (MCD diet plus G49). Mice fed high fat diet (HFD) for 10 weeks were divided in groups: HFD and H+G49 (HFD plus G49)...
November 23, 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
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