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Impaired glucose regulation

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https://www.readbyqxmd.com/read/29040458/orchestration-of-the-mammalian-host-cell-glucose-transporter-proteins-1-and-3-by-chlamydia-contributes-to-intracellular-growth-and-infectivity
#1
Xiaogang Wang, Kevin Hybiske, Richard S Stephens
Chlamydia are gram-negative obligate intracellular bacteria that replicate within a discrete cellular vacuole, called an inclusion. Although it is known that Chlamydia require essential nutrients from host cells to support their intracellular growth, the molecular mechanisms for acquiring these macromolecules remain uncharacterized. In the present study it was found that the expression of mammalian cell glucose transporter proteins 1 (GLUT1) and 3 (GLUT3) were up-regulated during chlamydial infection. Up-regulation was dependent on bacterial protein synthesis and Chlamydia-induced MAPK kinase activation...
October 9, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/29040168/failure-of-isoflurane-cardiac-preconditioning-in-obese-type-2-diabetic-mice-involves-aberrant-regulation-of-microrna-21-endothelial-nitric-oxide-synthase-and-mitochondrial-complex-i
#2
Zhi-Dong Ge, Yingchuan Li, Shigang Qiao, Xiaowen Bai, David C Warltier, Judy R Kersten, Zeljko J Bosnjak, Mingyu Liang
BACKGROUND: Diabetes impairs the cardioprotective effect of volatile anesthetics, yet the mechanisms are still murky. We examined the regulatory effect of isoflurane on microRNA-21, endothelial nitric-oxide synthase, and mitochondrial respiratory complex I in type II diabetic mice. METHODS: Myocardial ischemia/reperfusion injury was produced in obese type 2 diabetic (db/db) and C57BL/6 control mice ex vivo in the presence or absence of isoflurane administered before ischemia...
October 17, 2017: Anesthesiology
https://www.readbyqxmd.com/read/29040005/the-shape-of-vesicle-containing-organelles-is-critical-for-their-functions-in-vesicle-endocytosis
#3
Chelsea M Winters, Ly Q Hong-Brown, Hui-Ling Chiang
Exosomes are small vesicles secreted by a variety of cell types under physiological and pathological conditions. When Saccharomyces cerevisiae are grown in low glucose, small vesicles carrying more than 300 proteins with diverse biological functions are secreted. Upon glucose addition, secreted vesicles are endocytosed that requires cup-shaped organelles containing the major eisosome protein Pil1p at the rims. We aim to identify genes that regulate the function of cup-shaped organelles in vesicle endocytosis...
October 17, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/29032333/glucagon-like-peptide-1-improves-%C3%AE-cell-dysfunction-by-suppressing-the-mir-27a-induced-downregulation-of-atp-binding-cassette-transporter-a1
#4
Yue Yao, Yi Xu, Wei Wang, Jinchao Zhang, Qiang Li
Lipotoxicity is considered one of the main causes of deterioration in β-cells function. Glucagon-like peptide-1 (GLP-1) has been revealed to protect and improve pancreatic β-cell function against lipotoxicity. However, the mechanism behind these is largely unknown. The aim of this study was to investigate the effects of GLP-1 on cholesterol-induced lipotoxicity in INS-1 cells and examine the underlying mechanisms. The cell viability was determined, and caspase-3 was used to assess the effects of GLP-1 on cholesterol-induced apoptosis...
October 12, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29032081/protein-malnutrition-after-weaning-disrupts-peripheral-clock-and-daily-insulin-secretion-in-mice
#5
Patricia Cristine Borck, Thiago Martins Batista, Jean Franciesco Vettorazzi, Rafael Ludemann Camargo, Antonio Carlos Boschero, Elaine Vieira, Everardo Magalhães Carneiro
Changes in nutritional state may alter circadian rhythms through alterations in expression of clock genes. Protein deficiency has a profound effect on body metabolism, but the effect of this nutrient restriction after weaning on biological clock has not been explored. Thus, this study aims to investigate whether the protein restriction affects the daily oscillation in the behavior and metabolic rhythms, as well as expression of clock genes in peripheral tissues. Male C57BL/6 J mice, after weaning, were fed a normal-protein (NP) diet or a low-protein (LP) diet for 8 weeks...
September 4, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29031723/inhibition-of-cholinergic-potentiation-of-insulin-secretion-from-pancreatic-islets-by-chronic-elevation-of-glucose-and-fatty-acids-protection-by-casein-kinase-2-inhibitor
#6
Nicolai M Doliba, Qin Liu, Changhong Li, Pan Chen, Chengyang Liu, Ali Naji, Franz M Matschinsky
OBJECTIVES: Chronic hyperlipidemia and hyperglycemia are characteristic features of type 2 diabetes (T2DM) that are thought to cause or contribute to β-cell dysfunction by "glucolipotoxicity." Previously we have shown that acute treatment of pancreatic islets with fatty acids (FA) decreases acetylcholine-potentiated insulin secretion. This acetylcholine response is mediated by M3 muscarinic receptors, which play a key role in regulating β-cell function. Here we examine whether chronic FA exposure also inhibits acetylcholine-potentiated insulin secretion using mouse and human islets...
October 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29031721/cdkal1-a-type-2-diabetes-susceptibility-gene-regulates-mitochondrial-function-in-adipose-tissue
#7
Colin J Palmer, Raphael J Bruckner, Joao A Paulo, Lawrence Kazak, Jonathan Z Long, Amir I Mina, Zhaoming Deng, Katherine B LeClair, Jessica A Hall, Shangyu Hong, Peter-James H Zushin, Kyle L Smith, Steven P Gygi, Susan Hagen, David E Cohen, Alexander S Banks
OBJECTIVES: Understanding how loci identified by genome wide association studies (GWAS) contribute to pathogenesis requires new mechanistic insights. Variants within CDKAL1 are strongly linked to an increased risk of developing type 2 diabetes and obesity. Investigations in mouse models have focused on the function of Cdkal1 as a tRNA(Lys) modifier and downstream effects of Cdkal1 loss on pro-insulin translational fidelity in pancreatic β-cells. However, Cdkal1 is broadly expressed in other metabolically relevant tissues, including adipose tissue...
October 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29030115/store-operated-ca-2-entry-controls-clonal-expansion-of-t-cells-through-metabolic-reprogramming
#8
Martin Vaeth, Mate Maus, Stefan Klein-Hessling, Elizaveta Freinkman, Jun Yang, Miriam Eckstein, Scott Cameron, Stuart E Turvey, Edgar Serfling, Friederike Berberich-Siebelt, Richard Possemato, Stefan Feske
Store-operated Ca(2+) entry (SOCE) is the main Ca(2+) influx pathway in lymphocytes and is essential for T cell function and adaptive immunity. SOCE is mediated by Ca(2+) release-activated Ca(2+) (CRAC) channels that are activated by stromal interaction molecule (STIM) 1 and STIM2. SOCE regulates many Ca(2+)-dependent signaling molecules, including calcineurin, and inhibition of SOCE or calcineurin impairs antigen-dependent T cell proliferation. We here report that SOCE and calcineurin regulate cell cycle entry of quiescent T cells by controlling glycolysis and oxidative phosphorylation...
October 10, 2017: Immunity
https://www.readbyqxmd.com/read/29029025/insulin-deficient-mouse-%C3%AE-cells-do-not-fully-mature-but-can-be-remedied-through-insulin-replacement-by-islet-transplantation
#9
Adam Ramzy, Majid Mojibian, Timothy J Kieffer
Insulin receptor insufficiency in β-cells leads to impaired insulin secretion and reduced β-cell hyperplasia in response to hyperglycemia. Selective insulin receptor deficiency in β-cells in later embryological development may lead to compensatory β-cell hyperplasia. Though these findings suggest insulin signaling on the β-cell is important for β-cell function, they are confounded by loss of signaling by the IGFs through the insulin receptor. To determine if insulin itself is necessary for β-cell development and maturation, we performed a characterization of pancreatic islets in mice with deletions of both non-allelic insulin genes (Ins1-/-Ins2-/-)...
September 27, 2017: Endocrinology
https://www.readbyqxmd.com/read/29026155/trk-fused-gene-tfg-regulates-pancreatic-%C3%AE-cell-mass-and-insulin-secretory-activity
#10
Takeshi Yamamotoya, Yusuke Nakatsu, Akifumi Kushiyama, Yasuka Matsunaga, Koji Ueda, Yuki Inoue, Masa-Ki Inoue, Hideyuki Sakoda, Midori Fujishiro, Hiraku Ono, Hiroshi Kiyonari, Hisamitsu Ishihara, Tomoichiro Asano
The Trk-fused gene (TFG) is reportedly involved in the process of COPII-mediated vesicle transport and missense mutations in TFG cause several neurodegenerative diseases including hereditary motor and sensory neuropathy with proximal dominant involvement (HMSN-P). The high coincidence ratio between HMSN-P and diabetes mellitus suggests TFG to have an important role(s) in glucose homeostasis. To examine this possibility, β-cell specific TFG knockout mice (βTFG KO) were generated. Interestingly, βTFG KO displayed marked glucose intolerance with reduced insulin secretion...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29025860/negative-regulation-of-trpa1-by-amp-activated-protein-kinase-in-primary-sensory-neurons-as-a-potential-mechanism-of-painful-diabetic-neuropathy
#11
Shenglan Wang, Kimiko Kobayashi, Yoko Kogure, Hiroki Yamanaka, Satoshi Yamamoto, Hideshi Yagi, Koichi Noguchi, Yi Dai
AMP activated protein kinase (AMPK) is a widely expressed intracellular energy sensor that monitors and modulates energy expenditure. Transient receptor potential ankyrin 1 (TRPA1) channel is a widely recognized chemical and thermal sensor that plays vital roles in pain transduction. Here, we discovered a functional link between AMPK and TRPA1 in dorsal root ganglion (DRG) neurons, in which AMPK activation rapidly resulted in downregulation of membrane-associated TRPA1 and its channel activity within minutes...
October 12, 2017: Diabetes
https://www.readbyqxmd.com/read/29022062/fak-tyrosine-phosphorylation-is-regulated-by-ampk-and-controls-metabolism-in-human-skeletal-muscle
#12
David G Lassiter, Carolina Nylén, Rasmus J O Sjögren, Alexander V Chibalin, Harriet Wallberg-Henriksson, Erik Näslund, Anna Krook, Juleen R Zierath
AIMS/HYPOTHESIS: Insulin-mediated signals and AMP-activated protein kinase (AMPK)-mediated signals are activated in response to physiological conditions that represent energy abundance and shortage, respectively. Focal adhesion kinase (FAK) is implicated in insulin signalling and cancer progression in various non-muscle cell types and plays a regulatory role during skeletal muscle differentiation. The role of FAK in skeletal muscle in relation to insulin stimulation or AMPK activation is unknown...
October 11, 2017: Diabetologia
https://www.readbyqxmd.com/read/29021207/impact-of-lifestyle-and-metformin-interventions-on-the-risk-of-progression-to-diabetes-and-regression-to-normal-glucose-regulation-in-overweight-or-obese-people-with-impaired-glucose-regulation
#13
William H Herman, Qing Pan, Sharon L Edelstein, Kieren J Mather, Leigh Perreault, Elizabeth Barrett-Connor, Dana M Dabelea, Edward Horton, Steven E Kahn, William C Knowler, Carlos Lorenzo, Xavier Pi-Sunyer, Elizabeth Venditti, Wen Ye
OBJECTIVE: Both lifestyle and metformin interventions can delay or prevent progression to type 2 diabetes mellitus (DM) in people with impaired glucose regulation, but there is considerable interindividual variation in the likelihood of receiving benefit. Understanding an individual's 3-year risk of progressing to DM and regressing to normal glucose regulation (NGR) might facilitate benefit-based tailored treatment. RESEARCH DESIGN AND METHODS: We used the values of 19 clinical variables measured at the Diabetes Prevention Program (DPP) baseline evaluation and Cox proportional hazards models to assess the 3-year risk of progression to DM and regression to NGR separately for DPP lifestyle, metformin, and placebo participants who were adherent to the interventions...
October 11, 2017: Diabetes Care
https://www.readbyqxmd.com/read/29018134/neuronal-sirt1-silent-information-regulator-2-homologue-1-regulates-glycolysis-and-mediates-resveratrol-induced-ischemic-tolerance
#14
Kevin B Koronowski, Nathalie Khoury, Isabel Saul, Zachary B Loris, Charles H Cohan, Holly M Stradecki-Cohan, Kunjan R Dave, Juan I Young, Miguel A Perez-Pinzon
BACKGROUND AND PURPOSE: Resveratrol, at least in part via SIRT1 (silent information regulator 2 homologue 1) activation, protects against cerebral ischemia when administered 2 days before injury. However, it remains unclear if SIRT1 activation must occur, and in which brain cell types, for the induction of neuroprotection. We hypothesized that neuronal SIRT1 is essential for resveratrol-induced ischemic tolerance and sought to characterize the metabolic pathways regulated by neuronal Sirt1 at the cellular level in the brain...
October 10, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28993899/industrial-antifoam-agents-impair-ethanol-fermentation-and-induce-stress-responses-in-yeast-cells
#15
Jens Christian Nielsen, Felipe Senne de Oliveira Lino, Thomas Gundelund Rasmussen, Jette Thykær, Christopher T Workman, Thiago Olitta Basso
The Brazilian sugarcane industry constitutes one of the biggest and most efficient ethanol production processes in the world. Brazilian ethanol production utilizes a unique process, which includes cell recycling, acid wash, and non-aseptic conditions. Process characteristics, such as extensive CO2 generation, poor quality of raw materials, and frequent contaminations, all lead to excessive foam formation during fermentations, which is treated with antifoam agents (AFA). In this study, we have investigated the impact of industrial AFA treatments on the physiology and transcriptome of the industrial ethanol strain Saccharomyces cerevisiae CAT-1...
October 10, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28993280/antidiabetic-activities-of-entagenic-acid-in-type-2-diabetic-db-db-mice-and-l6-myotubes-via-ampk-glut4-pathway
#16
Hui Xiong, Shengnan Zhang, Zhongqiu Zhao, Ping Zhao, Lvyi Chen, Zhinan Mei
ETHNOPHARMACOLOGICAL RELEVANCE: Entada phaseoloides (L.) Merr., a traditional Chinese folk medicine, has been used in treating diabetes and other inflammatory disorders. Our previous study revealed that the triterpene saponins in E.Phaseoloides possessed an antidiabetic effect in type 2 diabetic rats by activating AMP-activated protein kinase (AMPK). Entagenic acid, the principal aglycon, isolated from the seed kernels of E. phaseoloides, has been proposed to possess a significant role in the antidiabetic effect, however, its actual effect and pertinent mechanisms are still unknown...
October 7, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28991159/rosmarinic-acid-a-rosemary-extract-polyphenol-increases-skeletal-muscle-cell-glucose-uptake-and-activates-ampk
#17
Filip Vlavcheski, Madina Naimi, Brennan Murphy, Tomas Hudlicky, Evangelia Tsiani
Skeletal muscle is a major insulin-target tissue and plays an important role in glucose homeostasis. Impaired insulin action in muscles leads to insulin resistance and type 2 diabetes mellitus. 5' AMP-activated kinase (AMPK) is an energy sensor, its activation increases glucose uptake in skeletal muscle and AMPK activators have been viewed as a targeted approach in combating insulin resistance. We previously reported AMPK activation and increased muscle glucose uptake by rosemary extract (RE). In the present study, we examined the effects and the mechanism of action of rosmarinic acid (RA), a major RE constituent, in L6 rat muscle cells...
October 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28988132/ferulic-acid-attenuates-diabetes-induced-cognitive-impairment-in-rats-via-regulation-of-ptp1b-and-insulin-signaling-pathway
#18
Hao Wang, Xiaoxu Sun, Ning Zhang, Zhouye Ji, Zhanqiang Ma, Qiang Fu, Rong Qu, Shiping Ma
Cognitive impairment has been recognized as a typical characteristic of neurodegenerative disease in diabetes mellitus (DM) and this cognitive dysfunction may be a risk factor for Alzheimer's disease (AD). Ferulic acid, a phenolic compound commonly found in a range of plants, has emerged various properties including anti-inflammatory and neuroprotective effects. In the present study, the protective activities and relevant mechanisms of ferulic acid were evaluated in diabetic rats with cognitive deficits, which were induced by a high-glucose-fat (HGF) diet and low dose of streptozotocin (STZ)...
October 4, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28980855/regulation-of-glycolytic-metabolism-by-autophagy-in-liver-cancer-involves-selective-autophagic-degradation-of-hk2-hexokinase-2
#19
Lin Jiao, Hai-Liang Zhang, Dan-Dan Li, Ke-Li Yang, Jun Tang, Xuan Li, Jiao Ji, Yan Yu, Rui-Yan Wu, Senthilkumar Ravichandran, Jian-Jun Liu, Gong-Kan Feng, Min-Shan Chen, Yi-Xin Zeng, Rong Deng, Xiao-Feng Zhu
Impaired macroautophagy/autophagy and high levels of glycolysis are prevalent in liver cancer. However, it remains unknown whether there is a regulatory relationship between autophagy and glycolytic metabolism. In this study, by utilizing cancer cells with basal or impaired autophagic flux, we demonstrated that glycolytic activity is negatively correlated with autophagy level. The autophagic degradation of HK2 (hexokinase 2), a crucial glycolytic enzyme catalyzing the conversion of glucose to glucose-6-phosphate, was found to be involved in the regulation of glycolysis by autophagy...
October 5, 2017: Autophagy
https://www.readbyqxmd.com/read/28978813/normal-pancreatic-%C3%AE-cell-function-in-mice-with-rip-cre-mediated-inactivation-of-p62-sqstm1
#20
Akira Honda, Koji Komiya, Akemi Hara, Ayako Fukunaka, Luka Suzuki, Takeshi Miyatsuka, Takeshi Ogihara, Yoshio Fujitani, Hirotaka Watada
Recent studies have suggested that decreased pancreatic β-cell function and mass are common features of patients with type 2 diabetes mellitus. Pancreatic β-cell homeostasis is regulated by various types of signaling molecules and stress responses. Sequestosome 1/p62 (SQSTM1, hereafter referred to as p62) is a ubiquitin-binding adaptor protein involved in cell signaling, oxidative stress, and autophagy. Because p62 appears to play an important role in maintaining mitochondrial quality control, it is possible that the loss of p62 in pancreatic β cells contributes to mitochondrial dysfunction, and thus leading to impaired glucose tolerance...
October 4, 2017: Endocrine Journal
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