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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
#1
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...
March 31, 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
#2
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
https://www.readbyqxmd.com/read/28414056/protective-effects-of-glycyrrhizic-acid-against-non-alcoholic-fatty-liver-disease-in-mice
#3
Xue Sun, Xingping Duan, Changyuan Wang, Zhihao Liu, Pengyuan Sun, Xiaokui Huo, Xiaodong Ma, Huijun Sun, Kexin Liu, Qiang Meng
Non-alcoholic fatty liver disease (NAFLD) has become a predictive factor of death from many diseases. The purpose of the present study is to investigate the protective effect of glycyrrhizic acid (GA), a natural triterpene glycoside, on NAFLD induced by a high-fat diet (HFD) in mice, and further to elucidate the mechanisms underlying GA protection. GA treatment significantly reduced the relative liver weight, serum ALT, AST activities, levels of serum lipid, blood glucose and insulin. GA suppressed lipid accumulation in liver...
April 14, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28403934/a-synthetic-nitraria-alkaloid-isonitramine-protects-pancreatic-%C3%AE-cell-and-attenuates-postprandial-hyperglycemia
#4
So Jung Kwon, Su Jung Hwang, Yeonghun Jung, Hyeung-Geun Park, Mi-Hyun Kim, Yohan Park, Hyo-Jong Lee
OBJECTIVE: The extracts of Nitraria genus are composed of Nitraria alkaloids and have been used traditionally as a hypoglycemic medicine. However, the efficacy and precise mechanism of Nitraria alkaloids remain largely unknown. METHODS: Previously, we reported the total synthesis of (+)-isonitramine, one of Nitraria alkaloids. In this study, we investigated the anti-diabetic potential of isonitramine in diabetes mellitus and its underlying molecular mechanism in carbohydrate catabolism in vitro and in vivo...
May 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28396610/modulation-of-glucose-metabolism-by-a-natural-compound-from-chloranthus-japonicus-via-activation-of-amp-activated-protein-kinase
#5
Rongkuan Hu, Huan Yan, Xiaoyan Fei, Haiyang Liu, Jiarui Wu
AMP-activated protein kinase (AMPK) is a key sensor and regulator of glucose metabolism. Here, we demonstrated that shizukaol F, a natural compound isolated from Chloranthus japonicus, can activate AMPK and modulate glucose metabolism both in vitro and in vivo. Shizukaol F increased glucose uptake in differentiated C2C12 myotubes by stimulating glucose transporter-4 (GLUT-4) membraned translocation. Treatment of primary mouse hepatocytes with shizukaol F decreased the expression of phosphoenolpyruvate carboxykinase 2 (PEPCK), glucose-6-phosphatase (G6Pase) and suppressed hepatic gluconeogenesis...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28396295/molecular-characterization-of-fasciola-flukes-obtained-from-wild-sika-deer-and-domestic-cattle-in-hokkaido-japan
#6
Madoka Ichikawa-Seki, Tomoko Shiroma, Tatsuya Kariya, Ryo Nakao, Yuma Ohari, Kei Hayashi, Shinya Fukumoto
The number of wild sika deer (Cervus nippon yesoensis) continues to increase in Hokkaido Prefecture, Japan. The major concern for the livestock industry is the transmission of pathogens between sika deer and cattle. Fasciolosis is an important disease that can occur in both animals. The aim of this study was to examine the possible mutual transmission of this disease in Hokkaido Prefecture. A total of 105 Fasciola flukes were obtained from sika deer and 96 from domestic cattle. The Fasciola flukes in Japan are reported to possess no mature sperm...
April 7, 2017: Parasitology International
https://www.readbyqxmd.com/read/28387334/sequential-exposure-to-obesogenic-factors-in-females-rats-from-physiological-changes-to-lipid-metabolism-in-liver-and-mesenteric-adipose-tissue
#7
Marta G Novelle, María J Vázquez, Juan R Peinado, Kátia D Martinello, Miguel López, Simon M Luckman, Manuel Tena-Sempere, María M Malagón, Rubén Nogueiras, Carlos Diéguez
During their lifetime, females are subjected to different nutritional and hormonal factors that could increase the risk of obesity and associated comorbidities. From early postnatal periods until the postmenopausal phase, exposure to over nutrition, high-energy diet and oestrogen deficiency, are considered as significant obesity risk factors in women. In this study, we assessed how key transitional life events and exposure to different nutrition influence energy homeostasis in a rat model. Specifically, we assessed the sequential exposure to postnatal over nutrition, high-fat diet (HFD) after weaning, followed later by ovariectomy (OVX; as a model of menopause)...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28379184/the-effect-of-phloroglucinol-a-component-of-ecklonia-cava-extract-on-hepatic-glucose-production
#8
Ji-Young Yoon, Hojung Choi, Hee-Sook Jun
Phloroglucinol is a phenolic compound that is one of the major compounds in Ecklonia cava (brown alga). It has many pharmacological activities, but its anti-diabetic effect is not yet fully explored. In this study, we investigated the effect of phloroglucinol on the control of blood glucose levels and the regulation of hepatic glucose production. Phloroglucinol significantly improved glucose tolerance in male C57BL/6J mice fed a high fat diet (HFD) and inhibited glucose production in mouse primary hepatocytes...
April 5, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28371117/structural-constraints-and-importance-of-caffeic-acid-moiety-for-anti-hyperglycemic-effects-of-caffeoylquinic-acids-from-chicory
#9
Kimberly M Palatini Jackson, Thirumurugan Rathinasabapathy, Debora Esposito, Slavko Komarnytsky
SCOPE: Chicory (Cichorium intybus L.) is a perennial herb often consumed as a vegetable, whereas the ground and roasted roots are blended as a coffee substitute. Caffeoylquinic or chlorogenic acids (CQA), the abundant intermediates of lignin biosynthesis in chicory, have been reported to improve glucose metabolism in humans, but the functional group in their structure responsible for this effect has not been yet characterized. METHODS AND RESULTS: Here, we showed that three di-O-caffeoylquinic acids suppressed hepatic glucose production in H4IIE rat hepatoma cells by reducing expression of glucose-6-phosphatase (G6Pase) and phosphoenolpyruvate carboxykinase (PEPCK), two key enzymes that regulate hepatic gluconeogenesis...
April 3, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28331449/cyclin-d1-in-the-liver-role-of-noncanonical-signaling-in-liver-steatosis-and-hormone-regulation
#10
Kelley G Núñez, Janet Gonzalez-Rosario, Paul T Thevenot, Ari J Cohen
BACKGROUND: Cyclin D1 is an important protein for cell cycle progression; however, functions independent of the cell cycle have been described in the liver. Cyclin D1 is also involved in DNA repair, is overexpressed in many cancers, and functions as a proto-oncogene. The lesser-known roles of Cyclin D1, specifically in hepatocytes, impact liver steatosis and hormone regulation in the liver. METHODS: A comprehensive search of PubMed was conducted using the keywords Cyclin D1, steatosis, lipogenesis, and liver transplantation...
2017: Ochsner Journal
https://www.readbyqxmd.com/read/28324053/hepatic-insulin-resistance-and-altered-gluconeogenic-pathway-in-premature-baboons
#11
Lisa McGill-Vargas, Amalia Gastaldelli, Hanyu Liang, Diana Anzueto Guerra, Teresa Johnson-Pais, Steven Seidner, Donald McCurnin, Giovanna Muscogiuri, Ralph DeFronzo, Nicolas Musi, Cynthia Blanco
Premature infants have altered glucose regulation early in life and increased risk for diabetes in adulthood. Although prematurity leads to an increased risk of diabetes and metabolic syndrome in adult life, the role of hepatic glucose regulation and adaptation to an early extra-uterine environment in preterm infants remain unknown. The purpose of this study was to investigate developmental differences in glucose metabolism, hepatic protein content and gene expression of key insulin signaling/gluconeogenic molecules...
January 17, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324010/separating-the-anti-inflammatory-and-diabetogenic-effects-of-glucocorticoids-through-lxr%C3%AE-antagonism
#12
Rucha Patel, Lilia Magomedova, Ricky Tsai, Stéphane Angers, Arturo Orellana, Carolyn L Cummins
Synthetic glucocorticoids (GCs), including dexamethasone (DEX), are powerful anti-inflammatory drugs. Long-term use of GCs, however, can result in metabolic side effects such as hyperglycemia, hepatosteatosis, and insulin resistance. The GC receptor (GR) and liver X receptors (LXRα and LXRβ) regulate overlapping genes involved in gluconeogenesis and inflammation. We have previously shown that Lxrβ-/- mice are resistant to the diabetogenic effects of DEX but still sensitive to its immunosuppressive actions...
April 1, 2017: Endocrinology
https://www.readbyqxmd.com/read/28302863/transfer-of-dysbiotic-gut-microbiota-has-beneficial-effects-on-host-liver-metabolism
#13
Simon Nicolas, Vincent Blasco-Baque, Audren Fournel, Jerome Gilleron, Pascale Klopp, Aurelie Waget, Franck Ceppo, Alysson Marlin, Roshan Padmanabhan, Jason S Iacovoni, François Tercé, Patrice D Cani, Jean-François Tanti, Remy Burcelin, Claude Knauf, Mireille Cormont, Matteo Serino
Gut microbiota dysbiosis has been implicated in a variety of systemic disorders, notably metabolic diseases including obesity and impaired liver function, but the underlying mechanisms are uncertain. To investigate this question, we transferred caecal microbiota from either obese or lean mice to antibiotic-free, conventional wild-type mice. We found that transferring obese-mouse gut microbiota to mice on normal chow (NC) acutely reduces markers of hepatic gluconeogenesis with decreased hepatic PEPCK activity, compared to non-inoculated mice, a phenotypic trait blunted in conventional NOD2 KO mice...
March 16, 2017: Molecular Systems Biology
https://www.readbyqxmd.com/read/28300729/comparison-of-silicon-nanoparticles-and-silicate-treatments-in-fenugreek
#14
Sanam Nazaralian, Ahmad Majd, Saeed Irian, Farzaneh Najafi, Farrokh Ghahremaninejad, Tommy Landberg, Maria Greger
Silicon (Si) fertilization improves crop cultivation and is commonly added in the form of soluble silicates. However, most natural plant-available Si originates from plant formed amorphous SiO2 particles, phytoliths, similar to SiO2-nanoparticles (SiNP). In this work we, therefore, compared the effect by sodium silicate and that of SiNP on Si accumulation, activity of antioxidative stress enzymes catalase, peroxidase, superoxide dismutase, lignification of xylem cell walls and activity of phenylalanine ammonia-lyase (PAL) as well as expression of genes for the putative silicon transporter (PST), defensive (Tfgd 1) and phosphoenolpyruvate carboxykinase (PEPCK) and protein in fenugreek (Trigonella foenum-graecum L...
March 14, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28285130/phylogenic-and-phosphorylation-regulation-difference-of-phosphoenolpyruvate-carboxykinase-of-c3-and-c4-plants
#15
Zhuo Shen, Xiu-Mei Dong, Zhi-Fang Gao, Qing Chao, Bai-Chen Wang
In C4 plants, phosphoenolpyruvate carboxykinase (PEPCK) plays a key role in the C4 cycle. PEPCK is also involved in gluconeogenesis and is conserved in both lower and higher organisms, including in animals and plants. A phylogenic tree constructed from PEPCK sequences from bacteria to higher plants indicates that the C4 Poaceae PEPCKs are conserved and have diverged from the PEPCKs of C3 plants. The maximum enzymatic activities of wild-type and phosphorylation mimic PEPCK proteins indicate that there is a significant difference between C3 and C4 plant PEPCKs...
February 27, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28280902/ginsenoside-rg5-attenuates-hepatic-glucagon-response-via-suppression-of-succinate-associated-hif-1%C3%AE-induction-in-hfd-fed-mice
#16
Na Xiao, Meng-Die Lou, Yi-Tong Lu, Le-Le Yang, Qun Liu, Baolin Liu, Lian-Wen Qi, Ping Li
AIMS/HYPOTHESIS: Ginsenosides regulate glucose homeostasis. This study investigated the effect of ginsenoside Rg5 (Rg5) on the hepatic glucagon response, focusing on the regulation of metabolism. METHODS: Mice fed a high-fat diet (HFD) showed increased hepatic glucose production (HGP). We observed the effects of Rg5 on hepatic fatty acid oxidation and glucagon response. The regulation of phosphodiesterase (PDE) 4B by succinate was also investigated in hepatocytes...
March 9, 2017: Diabetologia
https://www.readbyqxmd.com/read/28273928/lysophosphatidic-acid-counteracts-glucagon-induced-hepatocyte-glucose-production-via-stat3
#17
Evan P Taddeo, Stefan R Hargett, Sujoy Lahiri, Marin E Nelson, Jason A Liao, Chien Li, Jill K Slack-Davis, Jose L Tomsig, Kevin R Lynch, Zhen Yan, Thurl E Harris, Kyle L Hoehn
Hepatic glucose production (HGP) is required to maintain normoglycemia during fasting. Glucagon is the primary hormone responsible for increasing HGP; however, there are many additional hormone and metabolic factors that influence glucagon sensitivity. In this study we report that the bioactive lipid lysophosphatidic acid (LPA) regulates hepatocyte glucose production by antagonizing glucagon-induced expression of the gluconeogenic enzyme phosphoenolpyruvate carboxykinase (PEPCK). Treatment of primary hepatocytes with exogenous LPA blunted glucagon-induced PEPCK expression and glucose production...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28260669/effects-of-chronic-exposure-to-dietary-selenomethionine-on-the-physiological-stress-response-in-juvenile-white-sturgeon-acipenser-transmontanus
#18
Sarah Patterson, Jenna Zee, Steve Wiseman, Markus Hecker
Selenium (Se) is an essential micronutrient, but at low concentrations can be toxic to aquatic organisms. Selenomethionine (SeMeth) is the primary dietary form of Se aquatic organisms are exposed to and is an environmental concern because it persists and bioaccumulates. White sturgeon (WS) might be particularly susceptible to bioaccumulative toxicants, such as SeMeth, due to their longevity and benthic lifestyle. Se exposure is known to have adverse effects on the physiological stress response in teleosts, but these effects are unknown in WS...
February 3, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28253935/particulate-air-pollution-mediated-effects-on-insulin-resistance-in-mice-are-independent-of-ccr2
#19
Cuiqing Liu, Xiaohua Xu, Yuntao Bai, Jixin Zhong, Aixia Wang, Lixian Sun, Liya Kong, Zhekang Ying, Qinghua Sun, Sanjay Rajagopalan
BACKGROUND: Chronic exposure to fine ambient particulate matter (PM2.5) induces insulin resistance. CC-chemokine receptor 2 (CCR2) appears to be essential in diet-induced insulin resistance implicating an important role for systemic cellular inflammation in the process. We have previously suggested that CCR2 is important in PM2.5 exposure-mediated inflammation leading to insulin resistance under high fat diet situation. The present study assessed the importance of CCR2 in PM2.5 exposure-induced insulin resistance in the context of normal diet...
March 3, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/28252054/enhancement-of-porcine-intramuscular-fat-content-by-overexpression-of-the-cytosolic-form-of-phosphoenolpyruvate-carboxykinase-in-skeletal-muscle
#20
Zijian Ren, Ying Wang, Yuanyuan Ren, Zhengwei Zhang, Weiwang Gu, Zhaoting Wu, Lingyi Chen, Lisha Mou, Rongfeng Li, Haiyuan Yang, Yifan Dai
Intramuscular fat (IMF) content has been generally recognized as a desirable trait in pork meat because of its positive effect on eating quality. An effective approach to enhance IMF content in pork is the generation of transgenic pigs. In this study, we used somatic cell nuclear transfer (SCNT) to generate cloned pigs exhibiting ectopic expression of phosphoenolpyruvate carboxykinase (PEPCK-C) driven by an α-skeletal-actin gene promoter, which was specifically expressed in skeletal muscle. Using qRT-PCR and Western blot analysis, we demonstrated that PEPCK-C was functionally expressed and had a significant effect on total fatty acid content in the skeletal muscle of the transgenic pigs, while the n-6/n-3 polyunsaturated fatty acid (PUFA) ratio showed no difference between transgenic and control pigs...
March 2, 2017: Scientific Reports
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