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https://www.readbyqxmd.com/read/28635611/modulatory-effects-of-naringin-on-hepatic-key-enzymes-of-carbohydrate-metabolism-in-high-fat-diet-low-dose-streptozotocin-induced-diabetes-in-rats
#1
Leelavinothan Pari, Ramasamy Chandramohan
We evaluated the modulatory effects of naringin on altered hepatic key enzymes of carbohydrate metabolism in high-fat diet/low-dose streptozotocin-induced diabetic rats. Oral treatment of naringin at a doses of 20, 40 and 80 mg/kg body weight to diabetic rats for 30 days resulted in a significant reduction in the levels of plasma glucose, blood glycosylated hemoglobin and increase in the levels of plasma insulin and blood hemoglobin. The altered activities of the hepatic key enzymes of carbohydrate metabolism such as hexokinase, glucose-6-phosphatase, fructose-1,6-bisphosphatase, glucose-6-phosphate dehydrogenase, glycogen synthase, glycogen phosphorylase and glycogen content of diabetic rats were significantly reverted to near normal levels by the treatment of naringin in a dose-dependent manner...
July 2017: General Physiology and Biophysics
https://www.readbyqxmd.com/read/28632902/impaired-hippocampal-glucose-metabolism-during-and-after-flurothyl-induced-seizures-in-mice-reduced-phosphorylation-coincides-with-reduced-activity-of-pyruvate-dehydrogenase
#2
Tanya S McDonald, Karin Borges
OBJECTIVE: To determine changes in glucose metabolism and the enzymes involved in the hippocampus ictally and postictally in the acute mouse flurothyl seizure model. METHODS: [U-(13) C]-Glucose was injected (i.p.) prior to, or following a 5 min flurothyl-induced seizure. Fifteen minutes later, mice were killed and the total metabolite levels and % (13) C enrichment were analyzed in the hippocampal formation using gas chromatography-mass spectrometry. Activities of key metabolic and antioxidant enzymes and the phosphorylation status of pyruvate dehydrogenase were measured, along with lipid peroxidation...
June 20, 2017: Epilepsia
https://www.readbyqxmd.com/read/28631582/effect-of-green-tea-extract-supplementation-on-glycogen-replenishment-in-exercised-human-skeletal-muscle
#3
Tsen-Wei Tsai, Chia-Chen Chang, Su-Fen Liao, Yi-Hung Liao, Chien-Wen Hou, Jung-Piao Tsao, I-Shiung Cheng
The purpose of this study was to investigate the effects of 8-week green tea extract (GTE) supplementation on promoting postexercise muscle glycogen resynthesis and systemic energy substrate utilisation in young college students. A total of eight healthy male participants (age: 22·0 (se 1·0) years, BMI: 24·2 (se 0·7) kg/m2, VO2max: 43·2 (se 2·4) ml/kg per min) participated in this study. GTE (500 mg/d for 8 weeks) was compared with placebo in participants in a double-blind/placebo-controlled and crossover study design with an 8-week washout period...
June 20, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28630423/thymosin-beta-4-regulates-activation-of-hepatic-stellate-cells-via-hedgehog-signaling
#4
Jieun Kim, Jeongeun Hyun, Sihyung Wang, Chanbin Lee, Jae-Wook Lee, Eun-Yi Moon, Heejae Cha, Anna Mae Diehl, Youngmi Jung
The molecular mechanisms of thymosin beta-4 (TB4) involved in regulating hepatic stellate cell (HSC) functions remain unclear. Therefore, we hypothesize that TB4 influences HSC activation through hedgehog (Hh) pathway. HSC functions declined in a TB4 siRNA-treated LX-2. TB4 suppression down-regulated both integrin linked kinase (ILK), an activator of smoothened, and phosphorylated glycogen synthase kinase 3 beta (pGSK-3B), an inactive form of GSK-3B degrading glioblastoma 2 (GLI2), followed by the decreased expression of both smoothened and GLI2...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630259/triacylglycerol-mimetics-regulate-membrane-interactions-of-glycogen-branching-enzyme-implications-for-therapy
#5
Rafael Alvarez, Jesús Casas, David J López, Maitane Ibarguren, Ariadna Suari-Rivera, Silvia Terés, Francisca Guardiola-Serrano, Alexander Lossos, Xavier Busquets, Or Kakhlon, Pablo V Escribá
Adult Polyglucosan Body Disease (APBD) is a neurological disorder characterized by adult-onset neurogenic bladder, spasticity, weakness, and sensory loss. The disease is caused by aberrant glycogen branching enzyme (GBE1-Y329S) yielding less branched, globular and soluble glycogen which tends to aggregate. We explore here whether, despite being a soluble enzyme, GBE1 activity is regulated by protein-membrane interactions. Since soluble proteins can contact a wide variety of cell membranes, we investigated the interactions of purified wild-type and Y329S GBE1 proteins with different types of model membranes (liposomes)...
June 19, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28629946/phytol-induced-pathology-in-2-hydroxyacyl-coa-lyase-hacl1-deficient-mice-evidence-for-a-second-non-hacl1-related-lyase
#6
Serena Mezzar, Evelyn De Schryver, Stanny Asselberghs, Els Meyhi, Petruta L Morvay, Myriam Baes, Paul P Van Veldhoven
2-Hydroxyacyl-CoA lyase (HACL1) is a key enzyme of the peroxisomal α-oxidation of phytanic acid. To better understand its role in health and disease, a mouse model lacking HACL1 was investigated. Under normal conditions, these mice did not display a particular phenotype. However, upon dietary administration of phytol, phytanic acid accumulated in tissues, mainly in liver and serum of KO mice. As a consequence of phytanic acid (or a metabolite) toxicity, KO mice displayed a significant weight loss, absence of abdominal white adipose tissue, enlarged and mottled liver and reduced hepatic glycogen and triglycerides...
June 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28629821/glycogen-reduction-in-myotubes-of-late-onset-pompe-disease-patients-using-antisense-technology
#7
Elisa Goina, Paolo Peruzzo, Bruno Bembi, Andrea Dardis, Emanuele Buratti
Glycogen storage disease type II (GSDII) is a lysosomal disorder caused by the deficient activity of acid alpha-glucosidase (GAA) enzyme, leading to the accumulation of glycogen within the lysosomes. The disease has been classified in infantile and late-onset forms. Most late-onset patients share a splicing mutation c.-32-13T > G in intron 1 of the GAA gene that prevents efficient recognition of exon 2 by the spliceosome. In this study, we have mapped the splicing silencers of GAA exon 2 and developed antisense morpholino oligonucleotides (AMOs) to inhibit those regions and rescue normal splicing in the presence of the c...
June 16, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28629266/polygonatum-sibiricum-polysaccharide-promotes-osteoblastic-differentiation-through-the-erk-gsk-3%C3%AE-%C3%AE-catenin-signaling-pathway-in-vitro
#8
Xiaoming Peng, Jichen He, Jinmin Zhao, Yunle Wu, Xiongzhi Shi, Li Du, Mengni Nong, Shaohui Zong, Gao-Feng Zeng
Natural compound Polygonatum sibiricum polysaccharide (PSP) has a variety of biological actions such as reducing blood fat, antitumor, antioxidant activities, and enhancing immune function. In our previous study has revealed that PSP can promote osteoblastic differentiation in bone mesenchymal stem cells (BMSCs) by increasing nuclear accumulation of β-catenin. This study was designed to investigate that PSP can upregulate nuclear β-catenin, which was prevented by inhibiting glycogen synthase kinase 3β (GSK-3β) activity, by effectively activating Wnt signaling independent of low-density lipoprotein receptor-related protein (LRP5) ...
June 19, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/28628306/lysine-deacetylation-by-hdac6-regulates-the-kinase-activity-of-akt-in-human-neural-progenitor-cells
#9
Jonathan Iaconelli, Jasmin Lalonde, Bradley Watmuff, Bangyan Liu, Ralph Mazitschek, Stephen J Haggarty, Rakesh Karmacharya
AKT family of serine-threonine kinases functions downstream of phosphatidylinositol 3-kinase (PI3K) to transmit signals by direct phosphorylation of a number of targets, including the mammalian target of rapamycin (mTOR), glycogen synthase kinase 3β (GSK3β) and β-catenin. AKT binds to phosphatidylinositol (3,4,5)-triphosphate (PIP3) generated by PI3K activation, which results in its membrane localization and subsequent activation through phosphorylation by phosphoinositide-dependent protein kinase 1 (PDK1)...
June 19, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28627683/regulatory-role-of-tumor-necrosis-factor-receptor-associated-factor-6-in-breast-cancer-by-activating-the-protein-kinase-b-glycogen-synthase-kinase-3%C3%AE-signaling-pathway
#10
Hongyu Shen, Liangpeng Li, Sujin Yang, Dandan Wang, Siying Zhou, Xiu Chen, Jinhai Tang
Tumor necrosis factor receptor-associated factor 6 (TRAF6) is an endogenous adaptor of innate and adaptive immune responses, and serves a crucial role in tumor necrosis factor receptor and toll‑like/interleukin‑1 receptor signaling. Although studies have demonstrated that TRAF6 has oncogenic activity, its potential contributions to breast cancer in human remains largely uninvestigated. The present study examined the expression levels and function of TRAF6 in breast carcinoma (n=32) and adjacent healthy (n=25) tissue samples...
June 15, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28627510/glycogen-controls-caenorhabditis-elegans-lifespan-and-resistance-to-oxidative-stress
#11
Ivan Gusarov, Bibhusita Pani, Laurent Gautier, Olga Smolentseva, Svetlana Eremina, Ilya Shamovsky, Olga Katkova-Zhukotskaya, Alexander Mironov, Evgeny Nudler
A high-sugar diet has been associated with reduced lifespan in organisms ranging from worms to mammals. However, the mechanisms underlying the harmful effects of glucose are poorly understood. Here we establish a causative relationship between endogenous glucose storage in the form of glycogen, resistance to oxidative stress and organismal aging in Caenorhabditis elegans. We find that glycogen accumulated on high dietary glucose limits C. elegans longevity. Glucose released from glycogen and used for NADPH/glutathione reduction renders nematodes and human hepatocytes more resistant against oxidative stress...
June 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28627441/clinical-and-genetic-characteristics-of-17-chinese-patients-with-glycogen-storage-disease-type-ixa
#12
Jiangwei Zhang, Yuheng Yuan, Mingsheng Ma, Yan Liu, Weimin Zhang, Fengxia Yao, Zhengqing Qiu
Glycogen storage disease (GSD) type IXa is caused by PHKA2 mutation, which accounts for about 75% of all the GSD type IX cases. Here we first summarized the clinical data and analyzed the PHKA2 gene of 17 Chinese male patients suspected of having GSD type IXa. Clinical symptoms of our patients included hepatomegaly, growth retardation, and liver dysfunction. The clinical and biochemical manifestations improved and even disappeared with age. We detected 14 mutations in 17 patients, including 8 novel mutations; exons 2 and 4 were hot spots in this research...
June 13, 2017: Gene
https://www.readbyqxmd.com/read/28626963/exercise-training-modulates-the-hepatic-renin-angiotensin-system-in-fructose-fed-rats
#13
Eliete Dalla Corte Frantz, Renata Frauches Medeiros, Isabele Gomes Giori, Juliana Bittencourt Silveira Lima, Thais Bento-Bernardes, Thaiane Gadioli Gaique, Caroline Fernandes-Santos, Tiago Fernandes, Edilamar Menezes Oliveira, Carla Paulo Vieira, Carlos Adam Conte-Junior, Karen Jesus Oliveira, Antonio Claudio Lucas da Nóbrega
The renin-angiotensin system (RAS) has been implicated in the development of metabolic syndrome. We investigated whether the hepatic RAS is modulated by exercise training and if this modulation improves the deleterious effects of fructose overload in rats. Male Wistar rats were divided into (n = 8 each) control (CT), exercise control (CT-Ex), high fructose (HFr) and exercise high fructose (HFr-Ex) groups. Fructose-drinking rats received D-fructose (100 g L(-1) ). After two weeks, CT-Ex and HFr-Ex rats were assigned to a treadmill training protocol at moderate-intensity for eight weeks (60 min day(-1) , four days/week)...
June 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28626604/seasonal-shifts-in-accumulation-of-glycerol-biosynthetic-gene-transcripts-in-mountain-pine-beetle-dendroctonus-ponderosae-hopkins-coleoptera-curculionidae-larvae
#14
Jordie D Fraser, Tiffany R Bonnett, Christopher I Keeling, Dezene P W Huber
Winter mortality is a major factor regulating population size of the mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Curculionidae). Glycerol is the major cryoprotectant in this freeze intolerant insect. We report findings from a gene expression study on an overwintering mountain pine beetle population over the course of 35 weeks. mRNA transcript levels suggest glycerol production in the mountain pine beetle occurs through glycogenolytic, gluconeogenic and potentially glyceroneogenic pathways, but not from metabolism of lipids...
2017: PeerJ
https://www.readbyqxmd.com/read/28626199/oxygen-and-glucose-as-stimulation-agents-for-bold-functional-mr-imaging-of-rabbit-liver-a-feasibility-study
#15
Fang Yuan, Bin Song, Zixing Huang, Xijiao Liu, Chunchao Xia
PURPOSE: To assess the feasibility of using oxygen and glucose as stimulating agents in blood-oxygen-level-dependent (BOLD) Functional Magnetic Resonance Imaging (fMRI) of rabbit liver and analyze the impacts by blood flow. METHODS: Pure oxygen inhalation, intravenous injection and oral administration of glucose were given to 11 New Zealand white rabbits to compare the differences of liver T2*, aortic flow (AF), portal vein flow (PVF), aortic area (AA) and portal vein area (PVA) before and at 5 min, 10 min, 20 min, 30 min after administrations...
June 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28625148/affinity-crystallography-reveals-the-bioactive-compounds-of-industrial-juicing-byproducts-of-punica-granatum-for-glycogen-phosphorylase
#16
George A Stravodimos, Anastassia L Kantsadi, Anna Apostolou, Efthimios Kyriakis, Vassiliki-Nafsika Kafaski-Kanelli, Theodora G A Solovou, Pagona Gatzona, Panagiota Cv Liggri, Stavroula Theofanous, Vyron A Gorgogietas, Apostolia Kissa, Chariklia Psachoula, Demetra S M Chatzileontiadou, Angelos Lemonakis, Anna-Maria G Psarra, Vassiliki T Skamnaki, Serkos Haroutounian, Demetres D Leonidas
BACKGROUND: Glycogen phosphorylase (GP) is a pharmaceutical target for the discovery of new antihyperglycaemic agents. Punica granatum is a well-known plant for its potent antioxidant and antimicrobial activities but so far has not been examined for antihyperglycaemic activity. OBJECTIVE: To examine the inhibitory potency of eighteen polyphenolic extracts obtained from Punica granatum fruits and industrial juicing byproducts against GP and discover their most bioactive ingredients...
June 18, 2017: Current Drug Discovery Technologies
https://www.readbyqxmd.com/read/28624830/activation-of-nrf2-ho-1-pathway-by-glycogen-synthase-kinase-3%C3%AE-inhibition-attenuates-renal-ischemia-reperfusion-injury-in-diabetic-rats
#17
Xiaohua Shen, Bo Hu, Guangtao Xu, Fengjuan Chen, Ruifen Ma, Nenghua Zhang, Jie Liu, Xiaoqin Ma, Jia Zhu, Yuhong Wu, Ruilin Shen
BACKGROUND/AIMS: Diabetes mellitus can exacerbate renal ischemia-reperfusion (I/R) injury (RI/RI). The aim of the present study was to evaluate the protective effect of GSK-3β inhibition (TDZD-8) on I/R-induced renal injury through the Nrf2/HO-1 pathway in a streptozocin (STZ)-induced diabetic rat model. METHODS: STZ-induced diabetic rats preconditioned with TDZD-8 and ZnPP were subjected to renal I/R. The extent of renal morphologic lesions. Renal function was assessed from blood urea nitrogen (BUN) and serum creatinine (Scr), as determined utlizing commercial kits...
2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/28624465/muscle-pathology-in-vici-syndrome-a-case-study-with-a-novel-mutation-in-epg5-and-a-summary-of-the-literature
#18
Carola Hedberg-Oldfors, Niklas Darin, Anders Oldfors
Vici syndrome is a disorder characterized by myopathy, cardiomyopathy, agenesis of the corpus callosum, immunodeficiency, cataracts, hypopigmentation, microcephaly, gross developmental delay and failure to thrive. It is caused by mutations in EPG5, which encodes a protein involved in the autophagy pathway. Although myopathy is part of the syndrome, few publications have described the muscle pathology. We present a detailed morphological analysis in a boy with Vici syndrome due to a novel homozygous one-base deletion in EPG5 (c...
May 8, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/28623166/casein-kinase-ii-ck2-glycogen-synthase-kinase-3-gsk-3-and-ikaros-mediated-regulation-of-leukemia
#19
REVIEW
Chandrika Gowda, Mario Soliman, Malika Kapadia, Yali Ding, Kimberly Payne, Sinisa Dovat
Signaling networks that regulate cellular proliferation often involve complex interactions between several signaling pathways. In this manuscript we review the crosstalk between the Casein Kinase II (CK2) and Glycogen Synthase Kinase-3 (GSK-3) pathways that plays a critical role in the regulation of cellular proliferation in leukemia. Both CK2 and GSK-3 are potential targets for anti-leukemia treatment. Previously published data suggest that CK2 and GSK-3 act synergistically to promote the phosphatidylinositol-3 kinase (PI3K) pathway via phosphorylation of PTEN...
June 13, 2017: Advances in Biological Regulation
https://www.readbyqxmd.com/read/28622746/sol-gel-derived-lithium-releasing-glass-for-cartilage-regeneration
#20
Siwei Li, Anthony Lb Maçon, Manon Jacquemin, Molly M Stevens, Julian R Jones
Wnt-signalling cascade is one of the crucial pathways involved in the development and homeostasis of cartilage. Influencing this pathway can potentially contribute to improved cartilage repair or regeneration. One key molecular regulator of the Wnt pathway is the glycogen synthase kinase-3 enzyme, the inhibition of which allows initiation of the signalling pathway. This study aims to utilise a binary SiO2-Li2O sol-gel derived glass for controlled delivery of lithium, a known glycogen synthase kinase-3 antagonist...
July 2017: Journal of Biomaterials Applications
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