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Glucose transport

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https://www.readbyqxmd.com/read/29145596/a-crispr-cas9-based-exploration-into-the-elusive-mechanism-for-lactate-export-in-saccharomyces-cerevisiae
#1
Robert Mans, Else-Jasmijn Hassing, Melanie Wijsman, Annabel Giezekamp, Jack T Pronk, Jean-Marc Daran, Antonius J A van Maris
CRISPR/Cas9-based genome editing allows rapid, simultaneous modification of multiple genetic loci in Saccharomyces cerevisiae. Here, this technique was used in a functional analysis study aimed at identifying the hitherto unknown mechanism of lactate export in this yeast. First, an S. cerevisiae strain was constructed with deletions in 25 genes encoding transport proteins, including the complete aqua(glycero)porin family and all known carboxylic-acid transporters. The 25-deletion strain was then transformed with an expression cassette for Lactobacillus casei lactate dehydrogenase (LcLDH)...
November 14, 2017: FEMS Yeast Research
https://www.readbyqxmd.com/read/29144823/the-relationship-of-braf-v600e-mutation-status-to-fdg-pet-ct-avidity-in-thyroid-cancer-a-review-and-meta-analysis
#2
Prasanna Santhanam, Rodhan Khthir, Lilja B Solnes, Paul W Ladenson
OBJECTIVES: Papillary thyroid cancers harboring BRAF (V600E) gene mutation have been shown to exhibit aggressive tumor behaviors and higher risks of recurrence and disease-specific death. In this systematic review and meta-analysis, we examine and report published evidence related to the accuracy of FDG-PET-CT in detection of residual disease in patients' with BRAF (V600E) mutated thyroid cancer. METHODS: We extracted data from PUBMED/MEDLINE and EMBASE from January, 1995 to March, 2017...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144225/prevalence-of-genetic-disorders-and-glut1-deficiency-in-a-ketogenic-diet-clinic
#3
Stacy Hewson, Ledia Brunga, Matilde Fernandez Ojeda, Elizabeth Imhof, Jaina Patel, Maria Zak, Elizabeth J Donner, Jeff Kobayashi, Gajja S Salomons, Saadet Mercimek-Andrews
Between July of 2012 and December of 2014, 39 patients were enrolled prospectively to investigate the prevalence of glucose transporter 1 (GLUT1) deficiency in a ketogenic diet clinic. None of them had GLUT1 deficiency. All patients seen in the same clinic within the same period were reviewed retrospectively. A total of 18 of these 85 patients had a genetic diagnosis, including GLUT1 deficiency, pathogenic copy number variants, congenital disorder of glycosylation, neuronal ceroid lipofuscinosis type II, mitochondrial disorders, tuberous sclerosis, lissencephaly, and SCN1A-, SCN8A-, and STXBP1-associated epileptic encephalopathies...
November 16, 2017: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/29142405/antihyperglycemic-activity-of-caralluma-fimbriata-an-in-vitro-approach
#4
Shenai Ashwini, Roy Anitha
Background: An increase in prevalence of diabetes mellitus necessitates the need to develop new drugs for its effective management. Plants and their bioactive compounds are found to be an alternative therapeutic approach. Caralluma fimbriata, used in this study, is well known for its various biological effects. Objective: The present study was designed to investigate the antihyperglycemic effect of the ethanolic leaf extract of C. fimbriata. Materials and Methods: Different concentrations (1-1000 mg/mL) of the ethanolic leaf extract of C...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142019/molecular-imaging-of-glut1-and-glut5-in-breast-cancer-a-multitracer-pet-imaging-study-in-mice
#5
Melinda Wuest, Ingrit Hamann, Vincent Bouvet, Darryl Glubrecht, Alison Marshall, Brendan Trayner, Olivier Soueidan, Daniel Krys, Michael Wagner, Chris Cheeseman, Frederick West, Frank Wuest
Use of [18F]FDG-PET in clinical breast cancer (BC) imaging is limited mainly due to insufficient expression levels of GLUT1 in up to 50% of all patients. Fructose-specific facilitative hexose transporter GLUT5 represents an alternative biomarker for PET imaging of hexose metabolism in BC. The goal of the present study was to compare uptake characteristics of selected hexose-based PET radiotracers in murine BC model EMT6. Uptake of 1-deoxy-1-[18F]fluoro-D-fructose (1-[18F]FDF), 6-deoxy-6-[18F]fluoro-D-fructose (6-[18F]FDF), 1-deoxy-1-[18F]fluoro-2,5-anhydro-mannitol (1-[18F]FDAM), 2-deoxy-2-[18F]fluoro-D-glucose (2-[18F]FDG) and 6-deoxy-6-[18F]fluoro-D-glucose (6-[18F]FDG) was studied in EMT6 cells, tumors and muscle and correlated to GLUT1 and GLUT5 expression levels...
November 15, 2017: Molecular Pharmacology
https://www.readbyqxmd.com/read/29141991/human-sex-hormone-binding-globulin-does-not-provide-metabolic-protection-against-dysglycemia-in-mice
#6
Yael Sofer, Nava Nevo, Michal Vechoropulus, Gabi Shefer, Esther Osher, Nathan Landis, Geoffrey L Hammond, Naftali Stern
BACKGROUND: Sex hormone binding globulin (SHBG) is the main transporter of sex hormones in most vertebrates. Low SHBG levels have been linked to increased propensity for diabetes and metabolic syndrome. Polymorphisms of the SHBG gene linked to low SHBG protein levels, also strongly predicted increased risk of type 2 diabetes, thus raising the possibility that SHBG may play a role in the in the pathogenesis of insulin resistance and diabetes. AIM: To examine whether expression of human SHBG in mice may ameliorate the development of diabetes and metabolic syndrome in response to a high fat diet...
November 15, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/29141004/lack-of-mitochondrial-muts-homolog-1-in-toxoplasma-gondii-disrupts-maintenance-and-fidelity-of-mitochondrial-dna-and-reveals-metabolic-plasticity
#7
Tamila Garbuz, Gustavo Arrizabalaga
The importance of maintaining the fidelity of the mitochondrial genome is underscored by the presence of various repair pathways within this organelle. Presumably, the repair of mitochondrial DNA would be of particular importance in organisms that possess only a single mitochondrion, like the human pathogens Plasmodium falciparum and Toxoplasma gondii. Understanding the machinery that maintains mitochondrial DNA in these parasites is of particular relevance, as mitochondrial function is a validated and effective target for anti-parasitic drugs...
2017: PloS One
https://www.readbyqxmd.com/read/29139301/design-of-a-24-week-trial-of-empagliflozin-once-daily-in-hypertensive-black-african-american-patients-with-type-2-diabetes-mellitus
#8
Keith C Ferdinand, Leo Seman, Afshin Salsali
OBJECTIVE: Black/African American patients have higher prevalence of type 2 diabetes mellitus (T2DM), diabetes-related complications, and hypertension, but they are often underrepresented in clinical trials. The sodium-glucose co-transporter 2 inhibitor, empagliflozin, was associated with significant improvements in glucose control (via hemoglobin [Hb] A1c) and reductions in blood pressure (BP; via office and ambulatory BP monitoring) in a primarily white population with T2DM and hypertension...
November 15, 2017: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/29137641/improving-e-coli-growth-performance-by-manipulating-small-rna-expression
#9
REVIEW
Alejandro Negrete, Joseph Shiloach
Efficient growth of E. coli, especially for production of recombinant proteins, has been a challenge for the biotechnological industry since the early 1970s. By employing multiple approaches, such as different media composition, various growth strategies and specific genetic manipulations, it is now possible to grow bacteria to concentrations exceeding 100 g/L and to achieve high concentrations of recombinant proteins. Although the growth conditions are carefully monitored and maintained, it is likely that during the growth process cells are exposed to periodic stress conditions, created by fluctuations in pH, dissolved oxygen, temperature, glucose, and salt concentration...
November 14, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/29137588/sodium-glucose-linked-transporter-2-inhibitor-associated-perioperative-euglycaemic-diabetic-ketoacidosis-a-case-for-a-perioperative-guideline
#10
C Hoffman, M Green, O Megafu
No abstract text is available yet for this article.
November 2017: Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/29137481/effects-of-pioglitazone-on-ventricular-myocyte-shortening-and-ca-2-transport-in-the-goto-kakizaki-type-2-diabetic-rat
#11
K A Salem, V Sydorenko, M Qureshi, M Oz, F C Howarth
Pioglitazone (PIO) is a thiazolidindione antidiabetic agent which improves insulin sensitivity and reduces blood glucose in experimental animals and treated patients. At the cellular level the actions of PIO in diabetic heart are poorly understood. A previous study has demonstrated shortened action potential duration and inhibition of a variety of transmembrane currents including L-type Ca(2+) current in normal canine ventricular myocytes. The effects of PIO on shortening and calcium transport in ventricular myocytes from the Goto-Kakizaki (GK) type 2 diabetic rat have been investigated...
November 10, 2017: Physiological Research
https://www.readbyqxmd.com/read/29137304/monocarboxylate-transporter-1-mct1-a-tool-to-stratify-acute-myeloid-leukemia-aml-patients-and-a-vehicle-to-kill-cancer-cells
#12
Filipa Lopes-Coelho, Carolina Nunes, Sofia Gouveia-Fernandes, Rita Rosas, Fernanda Silva, Paula Gameiro, Tânia Carvalho, Maria Gomes da Silva, José Cabeçadas, Sérgio Dias, Luís G Gonçalves, Jacinta Serpa
Dysregulation of glucose/lactate dynamics plays a role in cancer progression, and MCTs are key elements in metabolic remodeling. VEGF is a relevant growth factor in the maintenance of bone marrow microenvironment and it is also important in hematological diseases. Our aim was to investigate the role of VEGF in the metabolic adaptation of Acute myeloid leukemia (AML) cells by evaluating the metabolic profiles and cell features according to the AML lineage and testing lactate as a metabolic coin. Our in vitro results showed that AML promyelocytic (HL60) and monocytic (THP1) (but not erythroid- HEL) lineages are well adapted to VEGF and lactate rich environment...
October 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29137276/potential-clinical-value-of-pet-ct-in-predicting-occult-nodal-metastasis-in-t1-t2n0m0-lung-cancer-patients-staged-by-pet-ct
#13
Xiang Zhou, Ruohua Chen, Gang Huang, Jianjun Liu
We assessed the clinical value of 2-fluoro-2-deoxyglucose ((18)F-FDG) PET/CT imaging for predicting occult nodal metastasis in non-small cell lung cancer (NSCLC) patients. This retrospective study included 54 patients with T1-2N0M0 NSCLC who had undergone (18)F-FDG PET/CT before surgery. Occult nodal metastasis was detected in 25.9% (14/54) of the patients. Immunohistochemical analysis revealed that increased glucose transporter 1 expression was associated with occult nodal metastasis, but hexokinase 2 expression was not...
October 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29137117/a-systematic-review-and-meta-analysis-of-proteomics-literature-on-the-response-of-human-skeletal-muscle-to-obesity-type-2-diabetes-mellitus-t2dm-versus-exercise-training
#14
REVIEW
Kanchana Srisawat, Sam O Shepherd, Paulo J Lisboa, Jatin G Burniston
We performed a systematic review and meta-analysis of proteomics literature that reports human skeletal muscle responses in the context of either pathological decline associated with obesity/T2DM and physiological adaptations to exercise training. Literature was collected from PubMed and DOAJ databases following PRISMA guidelines using the search terms 'proteom*', and 'skeletal muscle' combined with either 'obesity, insulin resistance, diabetes, impaired glucose tolerance' or 'exercise, training'. Eleven studies were included in the systematic review, and meta-analysis was performed on a sub-set (four studies) of the reviewed literature that reported the necessary primary data...
November 11, 2017: Proteomes
https://www.readbyqxmd.com/read/29135232/confocal-raman-microscopy-for-the-determination-of-protein-and-quaternary-ammonium-ion-loadings-in-biocatalytic-membranes-for-electrochemical-energy-conversion-and-storage
#15
Rong Cai, Sofiene Abdellaoui, Jay P Kitt, Cullen Irvine, Joel Harris, Shelley D Minteer, Carol Korzeniewski
The need to immobilize active enzyme, while ensuring high rates of substrate turnover and electronic charge transfer with an electrode, is a centrally important challenge in the field of bioelectrocatalysis. In this work, we demonstrate the use of confocal Raman microscopy as a tool for quantitation and molecular-scale structural characterization of ionomers and proteins within biocatalytic membranes to aid in the development of energy efficient biofuel cells. A set of recently available short side chain Aquivion ionomers spanning a range of equivalent weight (EW) suitable for enzyme immobilization was investigated...
November 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29134558/development-of-hyperkalemia-following-treatment-with-dapagliflozin-dapa-in-a-patient-with-type-2-diabetes-after-bilateral-adrenalectomy
#16
Daichi Miyaoka, Akihiro Tsuda, Noriyuki Hayashi, Norikazu Toi, Akiyo Yamasaki, Yuki Nagata, Shinya Nakatani, Masafumi Kurajoh, Shinsuke Yamada, Tomoaki Morioka, Yasuo Imanishi, Masanori Emoto, Masaaki Inaba
Dapagliflozin (DAPA), a sodium-glucose co-transporter 2 (SGLT2) inhibitor, is known to have a beneficial diuretic effect, in addition to a glucose-lowering effect. Although SGLT2 inhibitor has been reported, the increase of hyperkalemia in patients treated with renin-angiotensin-aldosterone system (RAAS) inhibitors, their mechanism of action is unclear. We report the first case of a type 2 diabetes (T2DM) patient with potential mineralocorticoid deficiency who developed hyperkalemia after administration of DAPA...
November 13, 2017: CEN Case Reports
https://www.readbyqxmd.com/read/29134442/endothelial-tnf-%C3%AE-induction-by-hsp60-secreted-from-thp-1-monocytes-exposed-to-hyperglycaemic-conditions
#17
Ryan Dennis Martinus, Julie Goldsbury
A non-resolving inflammation of the endothelium is recognised to be an important process leading to atherosclerosis. In diabetes, this process is thought to account for a significant number of cardiovascular disease-associated death and disability. However, the molecular mechanisms by which diabetes contributes to endothelial inflammation remain to be established. Whilst there is some evidence linking hyperglycaemia-induced reactive oxygen species (ROS) formation by the mitochondrial electron-transport chain to oxidative stress, cellular injury and apoptosis in the endothelium, a clear link to endothelium inflammation has not yet been established...
November 13, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/29134152/the-role-of-mef2-transcription-factors-in-dehydration-and-anoxia-survival-in-rana-sylvatica-skeletal-muscle
#18
Myriam P Hoyeck, Hanane Hadj-Moussa, Kenneth B Storey
The wood frog (Rana sylvatica) can endure freezing of up to 65% of total body water during winter. When frozen, wood frogs enter a dormant state characterized by a cessation of vital functions (i.e., no heartbeat, blood circulation, breathing, brain activity, or movement). Wood frogs utilize various behavioural and biochemical adaptations to survive extreme freezing and component anoxia and dehydration stresses, including a global suppression of metabolic functions and gene expression. The stress-responsive myocyte enhancer factor-2 (MEF2) transcription factor family regulates the selective expression of genes involved in glucose transport, protein quality control, and phosphagen homeostasis...
2017: PeerJ
https://www.readbyqxmd.com/read/29133865/cold-acclimation-causes-fiber-type-specific-responses-in-glucose-and-fat-metabolism-in-rat-skeletal-muscles
#19
Diane M Sepa-Kishi, Yass Sotoudeh-Nia, Ayesha Iqbal, George Bikopoulos, Rolando B Ceddia
This study investigated fiber type-specific metabolic responses and the molecular mechanisms that regulate glucose and fat metabolism in oxidative and glycolytic muscles upon cold acclimation. Male Wistar rats were exposed to cold (4 °C) for 7 days, and then glycogen synthesis and content, glucose and palmitate oxidation, and the molecular mechanisms underlying these metabolic pathways were assessed in soleus (Sol), extensor digitorum longus (EDL), and epitrochlearis (Epit) muscles. Cold acclimation increased glycogen synthesis, glycogen content, glucose oxidation, and reduced glycogen synthase (GS) phosphorylation only in Sol muscles...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133607/cardiovascular-outcomes-and-risks-after-initiation-of-a-sodium-glucose-co-transporter-2-inhibitor-results-from-the-easel-population-based-cohort-study
#20
Jacob A Udell, Zhong Yuan, Toni Rush, Nicholas M Sicignano, Michael Galitz, Norman Rosenthal
Background : Clinical trials have shown cardiovascular benefits and potential risks from sodium glucose co-transporter 2 inhibitors (SGLT2i). Trials may have limited ability to address individual endpoints or safety concerns. Methods : We performed a population-based cohort study among type 2 diabetes patients with established cardiovascular disease newly initiated on antihyperglycemic agents (AHAs) within the US Department of Defense Military Health System between 4/1/2013 and 12/31/2016. Incidence rates, hazard ratios (HRs), and 95% confidence intervals (CIs) for time to first composite endpoint of all-cause mortality (ACM) and hospitalization for heart failure (HHF) event, major adverse cardiovascular events (MACE; defined as ACM, nonfatal myocardial infarction, and nonfatal stroke), and individual endpoints were evaluated using conditional Cox models comparing new SGLT2i users with other AHAs...
November 13, 2017: Circulation
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