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Gluconeogenesis

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https://www.readbyqxmd.com/read/28650662/glucose-restriction-combined-with-autophagy-inhibition-and-chemotherapy-in-hct-116-spheroids-decreases-cell-clonogenicity-and-viability-regulated-by-tumor-suppressor-genes
#1
Monica M Schroll, Gabriel J LaBonia, Katelyn R Ludwig, Amanda B Hummon
Drug resistance is a prevalent phenomenon that decreases the efficacy of cancer treatments and contributes to cancer progression and metastasis. Weakening drug resistant cancer cells prior to chemotherapy is a potential strategy to combat chemoresistance. One approach to damage resistant cancer cells is modulation of nutritional intake. The combination of nutrient restriction with targeted compound treatment results in pronounced molecular changes. This study provides valuable information about augmenting existing chemotherapeutic regimes with simultaneous glucose restriction and autophagy inhibition in colorectal cancer cells...
June 26, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28649750/vasopressin-physiology-assessment-and-osmosentation
#2
Lise Bankir, Daniel G Bichet, Nils G Morgenthaler
Vasopressin (AVP) plays a major role in the regulation of water and sodium homeostasis by its antidiuretic action on the kidney, mediated by V2 receptors. AVP secretion is stimulated by a rise in plasma osmolality, a decline in blood volume, or stress. V1a receptors are expressed in vascular smooth muscle cells but the role of vasopressin in blood pressure regulation is still a matter of debate. AVP may also play a role in some metabolic pathways, including gluconeogenesis, through its action on V1a receptors expressed in the liver...
June 25, 2017: Journal of Internal Medicine
https://www.readbyqxmd.com/read/28644880/o-glcnacylation-mediates-the-control-of-cytosolic-phosphoenolpyruvate-carboxykinase-activity-via-pgc1%C3%AE
#3
Pedro Latorre, Luis Varona, Carmen Burgos, José A Carrodeguas, Pascual López-Buesa
PGC1α is a coactivator of many transcription factors and cytosolic phosphoenolpyruvate carboxykinase (PCK1) is a key enzyme for gluconeogenesis. PGC1α interacts with the transcription factor PPARγ to stimulate PCK1 expression and thus de novo glucose synthesis. These proteins are not only important for central energy metabolism but also for supplying intermediates for other metabolic pathways, including lipidogenesis and protein synthesis and might therefore be important factors in the ethiopathogenesis of metabolic disorders like diabetes but also in other pathologies like cancer...
2017: PloS One
https://www.readbyqxmd.com/read/28642593/transforming-growth-factor-%C3%AE-1-regulates-the-nascent-hematopoietic-stem-cell-niche-by-promoting-gluconeogenesis
#4
C-Y Zhang, H-M Yin, H Wang, D Su, Y Xia, L-F Yan, B Fang, W Liu, Y-M Wang, A-H Gu, Y Zhou
The understanding of hematopoietic stem cell (HSC) emergence is important to generate HSCs from pluripotent precursors. However, integrated signaling network that regulates the niche of nascent HSCs remains unclear. Herein, we uncovered a novel role of TGF-β1 in the metabolic niche of HSC emergence using the tgf-β1b(-/-) zebrafish. Our findings first showed that Tgf-β1 transcripts were enriched in the nascent HSCs. Loss of tgf-β1b caused a decrease of nascent HSCs within the aorta-gonad-mesonephros. Moreover, tgf-β1b(+) cells were runx1(+) HSCs and underwent an endothelial-to-hematopoietic-transition process...
June 23, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28639078/a-genome-wide-expression-association-analysis-identifies-genes-and-pathways-associated-with-amyotrophic-lateral-sclerosis
#5
Yanan Du, Yan Wen, Xiong Guo, Jingcan Hao, Wenyu Wang, Awen He, Qianrui Fan, Ping Li, Li Liu, Xiao Liang, Feng Zhang
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease with strong genetic components. To identity novel risk variants for ALS, utilizing the latest genome-wide association studies (GWAS) and eQTL study data, we conducted a genome-wide expression association analysis by summary data-based Mendelian randomization (SMR) method. Summary data were derived from a large-scale GWAS of ALS, involving 12577 cases and 23475 controls. The eQTL annotation dataset included 923,021 cis-eQTL for 14,329 genes and 4732 trans-eQTL for 2612 genes...
June 21, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28637808/dmt-efficiently-inhibits-hepatic-gluconeogenesis-involving-g%C3%AE-q-signaling-pathway
#6
Ting-Ting Zhou, Fei Ma, Xiao-Fan Shi, Xin Xu, Te Du, Xiao-Dan Guo, Gai-Hong Wang, Liang Yu, Vatcharin Rukachaisirikul, Li-Hong Hu, Jing Chen, Xu Shen
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disease with complicated pathogenesis, and targeting gluconeogenesis inhibition is a promising strategy for anti-diabetic drug discovery. G protein-coupled receptors (GPCRs) are classified as distinct families by heterotrimeric G proteins, primarily including Gαs, Gαi and Gαq. Gαs-coupled GPCRs function potently in the regulation of hepatic gluconeogenesis through activating cyclic adenosine monophosphate (cAMP)/protein kinase A (PKA) pathway, and Gαi-coupled GPCRs exhibit inhibitory effect on adenylyl cyclase and reduce intracellular cAMP level...
June 21, 2017: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/28634232/the-phosphocarrier-protein-hpr-of-the-bacterial-phosphotransferase-system-globally-regulates-energy-metabolism-by-directly-interacting-with-multiple-enzymes-in-escherichia-coli
#7
Irina A Rodionova, Zhongge Zhang, Jitender Mehla, Norman Goodacre, Mohan Babu, Andrew Emili, Peter Uetz, Milton H Saier
The histidine-phosphorylatable phosphocarrier protein HPr, is an essential component of the sugar-transporting phosphotransferase system (PTS) in many bacteria. Recent interactome findings suggested that HPr interacts with several carbohydrate-metabolizing enzymes, but whether HPr plays a regulatory role was unclear. Here, we provide evidence that HPr interacts with a large number of proteins in Escherichia coli. We demonstrate HPr-dependent allosteric regulation of the activities of pyruvate kinase (PykF, but not PykA), phosphofructokinase (PfkB, but not PfkA), glucosamine 6-phosphate deaminase (NagB) and adenylate kinase (Adk)...
June 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28630133/dual-regulation-of-gluconeogenesis-by-insulin-and-glucose-in-the-proximal-tubules-of-the-kidney
#8
Motohiro Sasaki, Takayoshi Sasako, Naoto Kubota, Yoshitaka Sakurai, Iseki Takamoto, Tetsuya Kubota, Reiko Inagi, George Seki, Moritaka Goto, Kohjiro Ueki, Masaomi Nangaku, Takahito Jomori, Takashi Kadowaki
Growing attention has been focused on the roles of the proximal tubules (PTs) of the kidney in glucose metabolism, including the mechanism of regulation of gluconeogenesis. Here, we found that PT-specific IRS1/2 double-knockout mice, established by using the newly generated sodium-glucose cotransporter-2 (SGLT2)-Cre transgenic mice, exhibited impaired insulin signaling and upregulated gluconeogenic gene expression and renal gluconeogenesis, resulting in systemic insulin resistance. On the other hand, in streptozotocin-treated mice, although insulin action was impaired in the PTs, the gluconeogenic gene expression was unexpectedly downregulated in the renal cortex, which was restored by administration of an SGLT1/2 inhibitor...
June 19, 2017: Diabetes
https://www.readbyqxmd.com/read/28628687/the-infatuation-with-biotin-supplementation-is-there-truth-behind-its-rising-popularity-a-comparative-analysis-of-clinical-efficacy-versus-social-popularity
#9
Teo Soleymani, Kristen Lo Sicco, Jerry Shapiro
<p>Biotin, also known as Vitamin B7 or vitamin H, is a water-soluble B vitamin that acts as an essential cofactor for several carboxylases involved in the cellular metabolism of fatty acids, amino acids, and gluconeogenesis. Although there exists an incredible amount of social media hype and market advertising touting its efficacy for the improvement of hair quantity and quality, biotin's efficacy for hair remains largely unsubstantiated in scientific literature. We reviewed all pertinent scientific literature regarding the efficacy of biotin supplementation for hair growth and quality improvement, and we also investigated its popularity in society defined as a function of market analytics...
May 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28627440/microrna-21-regulates-hepatic-glucose-metabolism-by-targeting-foxo1
#10
Ailing Luo, Haibo Yan, Jichao Liang, Chunyuan Du, Xuemei Zhao, Lijuan Sun, Yong Chen
Abnormal activation of hepatic gluconeogenesis is a major contributor to fasting hyperglycemia in type 2 diabetes; however, the potential role of microRNAs in gluconeogenesis remains unclear. Here, we showed that hepatic expression levels of microRNA-21 (miR-21) were decreased in db/db and high-fat diet (HFD)-induced diabetic mice. Adenovirus-mediated overexpression of miR-21 decreased the expression of phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (G6Pase) and inhibited glucose production in primary mouse hepatocytes...
June 13, 2017: Gene
https://www.readbyqxmd.com/read/28626963/exercise-training-modulates-the-hepatic-renin-angiotensin-system-in-fructose-fed-rats
#11
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
#12
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/28624444/distribution-lipid-bilayer-affinity-and-kinetics-of-the-metabolic-effects-of-dinoseb-in-the-liver
#13
Gabriela Bueno Franco Salla, Lívia Bracht, Anacharis Babeto de Sá-Nakanishi, Angela Valderrama Parizotto, Fabrício Bracht, Rosane Marina Peralta, Adelar Bracht
Dinoseb is a highly toxic pesticide of the dinitrophenol group. Its use has been restricted, but it can still be found in soils and waters in addition to being a component of related pesticides that, after ingestion by humans or animals, can originate the compound by enzymatic hydrolysis. As most dinitrophenols, dinoseb uncouples oxidative phosphorylation. In this study, distribution, lipid bilayer affinity and kinetics of the metabolic effects of dinoseb were investigated, using mainly the isolated perfused rat liver, but also isolated mitochondria and molecular dynamics simulations...
June 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28624287/variants-in-the-3-untranslated-region-of-the-ovine-acetyl-coenzyme-a-acyltransferase-2-gene-are-associated-with-dairy-traits-and-exhibit-differential-allelic-expression
#14
D Miltiadou, A L Hager-Theodorides, S Symeou, C Constantinou, A Psifidi, G Banos, O Tzamaloukas
The acetyl-CoA acyltransferase 2 (ACAA2) gene encodes an enzyme of the thiolase family that is involved in mitochondrial fatty acid elongation and degradation by catalyzing the last step of the respective β-oxidation pathway. The increased energy needs for gluconeogenesis and triglyceride synthesis during lactation are met primarily by increased fatty acid oxidation. Therefore, the ACAA2 enzyme plays an important role in the supply of energy and carbon substrates for lactation and may thus affect milk production traits...
June 14, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28623373/metabolic-and-evolutionary-patterns-in-the-extremely-acidophilic-archaeon-ferroplasma-acidiphilum-y-t
#15
Olga V Golyshina, Hai Tran, Oleg N Reva, Sofia Lemak, Alexander F Yakunin, Alexander Goesmann, Taras Y Nechitaylo, Violetta LaCono, Francesco Smedile, Alexei Slesarev, David Rojo, Coral Barbas, Manuel Ferrer, Michail M Yakimov, Peter N Golyshin
Ferroplasmaceae represent ubiquitous iron-oxidising extreme acidophiles with a number of unique physiological traits. In a genome-based study of Ferroplasma acidiphilum Y(T), the only species of the genus Ferroplasma with a validly published name, we assessed its central metabolism and genome stability during a long-term cultivation experiment. Consistently with physiology, the genome analysis points to F. acidiphilum Y(T) having an obligate peptidolytic oligotrophic lifestyle alongside with anaplerotic carbon assimilation...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28622709/spirulina-platensis-prevents-hyperglycemia-in-rats-by-modulating-gluconeogenesis-and-apoptosis-via-modification-of-oxidative-stress-and-mapk-pathways
#16
Kadry M Sadek, Mohamed A Lebda, Sherif M Nasr, Moustafa Shoukry
Spirulina platensis (SP) is a microalga with antioxidant, antidiabetic and anti-inflammatory properties. The present study explored the ability and potential mechanism(s) by which SP induced glucose lowering impact in diabetic rat model. Forty rats were allocated into four groups: control; streptozotocin (STZ)-induced diabetes (STZ, 45mg/kg b.w., intraperitoneally); SP (500mg/kg b.w., orally twice weekly for 2 months) and STZ-induced diabetes+SP group. In the STZ-induced diabetic rats, SP significantly decreased (P>0...
August 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28622511/metabolic-adaptation-establishes-disease-tolerance-to-sepsis
#17
Sebastian Weis, Ana Rita Carlos, Maria Raquel Moita, Sumnima Singh, Birte Blankenhaus, Silvia Cardoso, Rasmus Larsen, Sofia Rebelo, Sascha Schäuble, Laura Del Barrio, Gilles Mithieux, Fabienne Rajas, Sandro Lindig, Michael Bauer, Miguel P Soares
Sepsis is an often lethal syndrome resulting from maladaptive immune and metabolic responses to infection, compromising host homeostasis. Disease tolerance is a defense strategy against infection that preserves host homeostasis without exerting a direct negative impact on pathogens. Here, we demonstrate that induction of the iron-sequestering ferritin H chain (FTH) in response to polymicrobial infections is critical to establish disease tolerance to sepsis. The protective effect of FTH is exerted via a mechanism that counters iron-driven oxidative inhibition of the liver glucose-6-phosphatase (G6Pase), and in doing so, sustains endogenous glucose production via liver gluconeogenesis...
June 15, 2017: Cell
https://www.readbyqxmd.com/read/28622502/just-a-spoonful-of-sugar-helps-the-tolerance-go-up
#18
Alexander V Chervonsky
Survival of deleterious infections depends significantly on how much stress the affected organism can tolerate. In this issue, Weis et al. find that mice can survive sepsis by maintaining normoglycemia through ferritin's capacity to inactivate Fe(2+) ions that otherwise induce free radicals impacting gluconeogenesis in the liver.
June 15, 2017: Cell
https://www.readbyqxmd.com/read/28621452/osteogenic-commitment-and-differentiation-of-human-mesenchymal-stem-cells-by-low-intensity-pulsed-ultrasound-stimulation
#19
Viviana Costa, Valeria Carina, Simona Fontana, Angela De Luca, Francesca Monteleone, Stefania Pagani, Maria Sartori, Stefania Setti, Cesare Faldini, Riccardo Alessandro, Milena Fini, Gianluca Giavaresi
Low-intensity pulsed ultrasound (LIPUS) as an adjuvant therapy in in vitro and in vivo bone engineering has proven to be extremely useful. The present study aimed at investigating the effect of 30 mW/cm(2) LIPUS stimulation on commercially available human mesenchymal stem cells (hMSCs) cultured in basal or osteogenic medium at different experimental time points (7d, 14d, 21d). The hypothesis was that LIPUS would improve the osteogenic differentiation of hMSC and guarantying the maintenance of osteogenic committed fraction, as demonstrated by cell vitality and proteomic analysis...
June 16, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28620582/physicochemical-and-nutritional-requirements-for-axenic-replication-suggest-physiological-basis-for-coxiella-burnetii-niche-restriction
#20
Eduardo Vallejo Esquerra, Hong Yang, Savannah E Sanchez, Anders Omsland
Bacterial obligate intracellular parasites are clinically significant animal and human pathogens. Central to the biology of these organisms is their level of adaptation to intracellular replication niches associated with physicochemical and nutritional constraints. While most bacterial pathogens can adapt to a wide range of environments, severe niche restriction-an inability to thrive in diverse environments-is a hallmark of bacterial obligate intracellular parasites. Herein the physicochemical and nutritional factors underlying the physiological basis for niche restriction in the zoonotic bacterial obligate intracellular parasite and Q fever agent Coxiella burnetii are characterized...
2017: Frontiers in Cellular and Infection Microbiology
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