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https://www.readbyqxmd.com/read/27915162/high-fat-diet-induces-metabolic-changes-and-reduces-oxidative-stress-in-female-mouse-hearts
#1
Ignasi Barba, Elisabet Miró-Casas, José L Torrecilla, Eulàlia Pladevall, Sergi Tejedor, Rubén Sebastián-Pérez, Marisol Ruiz-Meana, José R Berrendero, Antonio Cuevas, David García-Dorado
After an acute myocardial infarction, obese patients generally have a better prognosis than their leaner counterparts, known as the "obesity paradox". In addition, female sex is associated with a lower risk of cardiac ischemic events and smaller infarct size compared to males. The objective of the present work was to study the metabolic phenotype and mitochondrial function associated to female sex and short-term high-fat diet. (1)H NMR spectra of mice heart extracts were analysed by mRMR variable selection and linear discriminant analysis was used to evaluate metabolic changes...
November 15, 2016: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/27914476/lidocaine-relaxation-in-isolated-rat-aortic-rings-is-enhanced-by-endothelial-removal-possible-role-of-kv-katp-channels-and-a2a-receptor-crosstalk
#2
Aryadi Arsyad, Geoffrey P Dobson
BACKGROUND: Lidocaine is an approved local anesthetic and Class 1B antiarrhythmic with a number of ancillary properties. Our aim was to investigate lidocaine's vasoreactivity properties in intact versus denuded rat thoracic aortic rings, and the effect of inhibitors of nitric oxide (NO), prostenoids, voltage-dependent Kv and KATP channels, membrane Na(+)/K(+) pump, and A2a and A2b receptors. METHODS: Aortic rings were harvested from adult male Sprague Dawley rats and equilibrated in an organ bath containing oxygenated, modified Krebs-Henseleit solution, pH 7...
December 3, 2016: BMC Anesthesiology
https://www.readbyqxmd.com/read/27913935/regulation-of-contractile-responses-of-vascular-smooth-muscle-cells-under-conditions-of-hypoxia-reoxygenation
#3
S V Gusakova, Yu G Birulina, L V Smagliy, I V Kovalev, I V Petrova, A V Nosarev, S N Orlov
We analyzed the effects of hypoxia and reoxygenation on changes in contractile activity in rat aortic smooth muscles. Both hypoxia and reoxygenation induced relaxation of smooth muscle cells precontracted with high-potassium Krebs solution (30 mM KCl) or α1-adrenoceptor agonist phenylephrine. Vasodilation resulted from enhancement of potassium permeability of smooth muscle cell membranes caused by activation of voltage-gated potassium channels (triggered by both precontracting agents) or by opening of ATP-sensitive potassium channels (phenylephrine)...
December 2, 2016: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27913208/the-functions-of-store-operated-calcium-channels
#4
REVIEW
James W Putney, Natacha Steinckwich-Besançon, Takuro Numaga-Tomita, Felicity M Davis, Pooja N Desai, Diane M D'Agostin, Shilan Wu, Gary S Bird
Store-operated calcium channels provide calcium signals to the cytoplasm of a wide variety of cell types. The basic components of this signaling mechanism include a mechanism for discharging Ca(2+) stores (commonly but not exclusively phospholipase C and inositol 1,4,5-trisphosphate), a sensor in the endoplasmic reticulum that also serves as an activator of the plasma membrane channel (STIM1 and STIM2), and the store-operated channel (Orai1, 2 or 3). The advent of mice genetically altered to reduce store-operated calcium entry globally or in specific cell types has provided important tools to understand the functions of these widely encountered channels in specific and clinically important physiological systems...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27913207/overexpression-of-stim1-in-neurons-in-mouse-brain-improves-contextual-learning-and-impairs-long-term-depression
#5
Łukasz Majewski, Filip Maciąg, Paweł M Boguszewski, Iga Wasilewska, Grzegorz Wiera, Tomasz Wójtowicz, Jerzy Mozrzymas, Jacek Kuznicki
STIM1 is an endoplasmic reticulum calcium sensor that is involved in several processes in neurons, including store-operated calcium entry. STIM1 also inhibits voltage-gated calcium channels, such as Cav1.2 and Cav3.1, and is thus considered a multifunctional protein. The aim of this work was to investigate the ways in which transgenic neuronal overexpression of STIM1 in FVB/NJ mice affects animal behavior and the electrophysiological properties of neurons in acute hippocampal slices. We overexpressed STIM1 from the Thy1...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27913206/mag-fluo4-in-t-cells-imaging-of-intra-organelle-free-ca-2-concentrations
#6
Björn-Philipp Diercks, Ralf Fliegert, Andreas H Guse
Ca(2+) signaling is a major signal transduction pathway involved in T cell activation, but also in apoptosis of T cells. Since T cells make use of several Ca(2+)-mobilizing second messengers, such as nicotinic acid adenine dinucleotide phosphate, d-myo-inositol 1,4,5-trisphosphate, and cyclic ADP-ribose, we intended to analyze luminal Ca(2+) concentration upon cell activation. Mag-Fluo4/AM, a low-affinity Ca(2+) dye known to localize to the endoplasmic reticular lumen in many cell types, showed superior brightness and bleaching stability, but, surprisingly, co-localized with mito-tracker, but not with ER-tracker in Jurkat T cells...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27913204/the-selective-bcl-2-inhibitor-venetoclax-a-bh3-mimetic-does-not-dysregulate-intracellular-ca-2-signaling
#7
Tamara Vervloessem, Hristina Ivanova, Tomas Luyten, Jan B Parys, Geert Bultynck
Anti-apoptotic B cell-lymphoma-2 (Bcl-2) proteins are emerging as therapeutic targets in a variety of cancers for precision medicines, like the BH3-mimetic drug venetoclax (ABT-199), which antagonizes the hydrophobic cleft of Bcl-2. However, the impact of venetoclax on intracellular Ca(2+) homeostasis and dynamics in cell systems has not been characterized in detail. Here, we show that venetoclax did not affect Ca(2+)-transport systems from the endoplasmic reticulum (ER) in permeabilized cell systems. Venetoclax (1μM) did neither trigger Ca(2+) release by itself nor affect agonist-induced Ca(2+) release in a variety of intact cell models...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27906032/infection-of-rhesus-macaques-with-a-pool-of-simian-immunodeficiency-virus-with-the-envelope-genes-from-acute-hiv-1-infections
#8
Kendall C Krebs, Meijuan Tian, Mohammed Asmal, Binhua Ling, Kenneth Nelson, Kenneth Henry, Richard Gibson, Yuejin Li, Weining Han, Robin J Shattock, Ronald S Veazey, Norman Letvin, Eric J Arts, Yong Gao
BACKGROUND: New simian-human immunodeficiency chimeric viruses with an HIV-1 env (SHIVenv) are critical for studies on HIV pathogenesis, vaccine development, and microbicide testing. Macaques are typically exposed to single CCR5-using SHIVenv which in most instances does not reflect the conditions during acute/early HIV infection (AHI) in humans. Instead of individual and serial testing new SHIV constructs, a pool of SHIVenv_B derived from 16 acute HIV-1 infections were constructed using a novel yeast-based SHIV cloning approach and then used to infect macaques...
November 25, 2016: AIDS Research and Therapy
https://www.readbyqxmd.com/read/27903832/predictors-of-the-size-of-the-exchangeable-zinc-pool-differ-between-children-and-adults
#9
Leland V Miller, K Michael Hambidge, Janet C King, Jamie E Westcott, Nancy F Krebs
BACKGROUND: The size of the rapidly exchanging pool of body zinc has been suggested as having potential utility as a biomarker of zinc status. Knowledge of the relations of exchangeable zinc pool (EZP) size to relevant variables is necessary to adequately evaluate its use as a biomarker. OBJECTIVE: We used regression analysis to investigate associations of EZP with age, sex, body size, and zinc nutrition variables. METHODS: Data were compiled from 18 isotope tracer studies of zinc absorption in 247 children and adults (248 observations) in which EZP and relevant variables (e...
November 30, 2016: Journal of Nutrition
https://www.readbyqxmd.com/read/27903678/adnp-is-a-therapeutically-inducible-repressor-of-wnt-signaling-in-colorectal-cancer
#10
Cristina Blaj, Agnes Bringmann, Eva Marina Schmidt, Manuela Urbischek, Sebastian Lamprecht, Thomas Fröhlich, Georg J Arnold, Stefan Krebs, Helmut Blum, Heiko Hermeking, Andreas Jung, Thomas Kirchner, David Horst
PURPOSE: Constitutively active WNT signaling is hallmark of colorectal cancers and driver of malignant tumor progression. Therapeutic targeting of WNT signaling is difficult due to high pathway complexity and its role in tissue homeostasis. Here we identify the transcription factor ADNP as a pharmacologically inducible repressor of WNT signaling in colon cancer. EXPERIMENTAL DESIGN: We used transcriptomic, proteomic, and in situ analyses to identify ADNP expression in colorectal cancer, and cell biology approaches to determine its function...
November 30, 2016: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/27900024/acute-effect-of-lactic-acid-on-tumor-endothelial-cell-metabolic-coupling-in-the-tumor-microenvironment
#11
Guanqun Zhu, Degui Wang, Shenqian Li, Xuecheng Yang, Yanwei Cao, Yonghua Wang, Haitao Niu
The present study aimed to systematically analyze alterations in the expression of mitochondrial-associated proteins in human bladder cancer T24 cells co-cultured with tumor-associated human umbilical vein endothelial cells (HUVECs), and to investigate the characteristics of bladder cancer cell energy metabolism. The present study used the following techniques: A co-culture system of T24 cells and HUVECs was constructed using a microfluidic chip as a 3D co-culture system; the concentration of lactic acid in the medium of the cells was determined using an automatic microplate reader; a qualitative analysis of mitochondria-associated protein expression was performed by immunofluorescent staining; and a quantitative analysis of mitochondrial-associated protein expression was conducted using western blotting...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27899739/impact-of-immune-deficiency-on-remodeling-of-maternal-resistance-vasculature-4-weeks-postpartum-in-mice
#12
Elizabeth A Bonney, Ann Howard, Kendall Krebs, Kelly Begin, Kelsey Veilleux, Natalia I Gokina
Pregnancy manifests changes in the vascular and immune systems that persist postpartum (PP), have important implications for future pregnancies, and may modify responses to cardiovascular stress in late life. The association between immune and vascular function and the generation or progression of cardiovascular disease beg the question of whether altered immunity modifies pregnancy-induced changes in the vasculature. Our objective was to compare changes in the function and remodeling of systemic resistance vessels 4 weeks PP in normal C57BL/6 (B6), and immunodeficient mice recombinase 1-deficient/B6 (Rag1(-/-))...
November 28, 2016: Reproductive Sciences
https://www.readbyqxmd.com/read/27899646/fairdomhub-a-repository-and-collaboration-environment-for-sharing-systems-biology-research
#13
Katherine Wolstencroft, Olga Krebs, Jacky L Snoep, Natalie J Stanford, Finn Bacall, Martin Golebiewski, Rostyk Kuzyakiv, Quyen Nguyen, Stuart Owen, Stian Soiland-Reyes, Jakub Straszewski, David D van Niekerk, Alan R Williams, Lars Malmström, Bernd Rinn, Wolfgang Müller, Carole Goble
The FAIRDOMHub is a repository for publishing FAIR (Findable, Accessible, Interoperable and Reusable) Data, Operating procedures and Models (https://fairdomhub.org/) for the Systems Biology community. It is a web-accessible repository for storing and sharing systems biology research assets. It enables researchers to organize, share and publish data, models and protocols, interlink them in the context of the systems biology investigations that produced them, and to interrogate them via API interfaces. By using the FAIRDOMHub, researchers can achieve more effective exchange with geographically distributed collaborators during projects, ensure results are sustained and preserved and generate reproducible publications that adhere to the FAIR guiding principles of data stewardship...
November 28, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27893700/trans-presentation-of-il-6-by-dendritic-cells-is-required-for-the-priming-of-pathogenic-th17-cells
#14
Sylvia Heink, Nir Yogev, Christoph Garbers, Marina Herwerth, Lilian Aly, Christiane Gasperi, Veronika Husterer, Andrew L Croxford, Katja Möller-Hackbarth, Harald S Bartsch, Karl Sotlar, Stefan Krebs, Tommy Regen, Helmut Blum, Bernhard Hemmer, Thomas Misgeld, Thomas F Wunderlich, Juan Hidalgo, Mohamed Oukka, Stefan Rose-John, Marc Schmidt-Supprian, Ari Waisman, Thomas Korn
The cellular sources of interleukin 6 (IL-6) that are relevant for differentiation of the TH17 subset of helper T cells remain unclear. Here we used a novel strategy for the conditional deletion of distinct IL-6-producing cell types to show that dendritic cells (DCs) positive for the signaling regulator Sirpα were essential for the generation of pathogenic TH17 cells. Using their IL-6 receptor α-chain (IL-6Rα), Sirpα(+) DCs trans-presented IL-6 to T cells during the process of cognate interaction. While ambient IL-6 was sufficient to suppress the induction of expression of the transcription factor Foxp3 in T cells, trans-presentation of IL-6 by DC-bound IL-6Rα (called 'IL-6 cluster signaling' here) was needed to prevent premature induction of interferon-γ (IFN-γ) expression in T cells and to generate pathogenic TH17 cells in vivo...
November 28, 2016: Nature Immunology
https://www.readbyqxmd.com/read/27888113/circadian-urinary-citrate-excretion-in-a-rat-model-of-exercise
#15
Paula Nuñez, Irene Diaz, Carmen Perillan, Juan Arguelles, Elena Diaz
AIMS: Circadian rhythms are the approximate 24h biological cycles that function to prepare an organism for daily environmental changes. Circadian rhythms unquestionably play critical roles in metabolic homeostasis and the exercise has emerged as a strong non-photic time cue or zeitgeber in animal models and humans. Numerous studies on the effects of exercise on the citrate synthase activity have been published. Citrate is used to assess energy production or expenditure because it is a substrate of the Krebs Cycle, a cycle for oxidative energy production...
November 22, 2016: Life Sciences
https://www.readbyqxmd.com/read/27885626/anaplerosis-for-glutamate-synthesis-in-the-neonate-and-in-adulthood
#16
Eva Brekke, Tora Sund Morken, Anne B Walls, Helle Waagepetersen, Arne Schousboe, Ursula Sonnewald
A central task of the tricarboxylic acid (TCA, Krebs, citric acid) cycle in brain is to provide precursors for biosynthesis of glutamate, GABA, aspartate and glutamine. Three of these amino acids are the partners in the intricate interaction between astrocytes and neurons and form the so-called glutamine-glutamate (GABA) cycle. The ketoacids α-ketoglutarate and oxaloacetate are removed from the cycle for this process. When something is removed from the TCA cycle it must be replaced to permit the continued function of this essential pathway, a process termed anaplerosis...
2016: Advances in Neurobiology
https://www.readbyqxmd.com/read/27884924/low-acuity-presentations-to-the-emergency-department-in-canada-exploring-the-alternative-attempts-to-avoid-presentation
#17
Lynette D Krebs, Scott W Kirkland, Rajiv Chetram, Taylor Nikel, Britt Voaklander, Alan Davidson, Bryn Holroyd, Cristina Villa-Roel, Katelynn Crick, Stephanie Couperthwaite, Chris Alexiu, Garnet Cummings, Brian H Rowe
OBJECTIVE: ED visits have been rising year on year worldwide. It has been suggested that some of these visits could be avoided if low-acuity patients had better primary care access. This study explored patients' efforts to avoid ED presentation and alternative care sought prior to presentation. METHODS: Consecutive adult patients presenting to three urban EDs in Edmonton, Canada, completed a questionnaire collecting demographics, actions attempted to avoid presentation and reasons for presentation...
November 24, 2016: Emergency Medicine Journal: EMJ
https://www.readbyqxmd.com/read/27882281/the-computation-of-confidence-intervals-for-the-state-parameters-of-power-systems
#18
Zahid Khan, Radzuan Bin Razali, Hanita Daud, Nursyarizal Mohd Nor, Mahmud Fotuhi-Firuzabad, Katrina Lane Krebs
BACKGROUND: In the past few decades, a significant volume of work has been carried out on various aspects of the state estimation problem to estimate an optimum state vector of the power system. This problem has been focused on, in previous studies regarding the computational efficiency and numerical robustness in view to find point estimates for system state parameters. This current investigation, constructed confidence intervals for the unknown state parameters of the system. The research indicates that confidence intervals can yield addition useful information about the estimated parameters...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27876761/early-infant-adipose-deposition-is-positively-associated-with-the-n-6-to-n-3-fatty-acid-ratio-in-human-milk-independent-of-maternal-bmi
#19
M C Rudolph, B E Young, D J Lemas, C E Palmer, T L Hernandez, L A Barbour, J E Friedman, N F Krebs, P S MacLean
BACKGROUND/OBJECTIVES: Excessive infant weight gain in the first 6-months of life is a powerful predictor of childhood obesity and related health risks. In mice, omega-6 fatty acids (FA) serve as potent ligands driving adipogenesis during early development. The ratio of omega-6 relative to omega-3 (n-6/n-3) FA in human milk (HM) has increased 3-fold over the last 30 years, but the impact of this shift on infant adipose development remains undetermined. This study investigated how maternal obesity and maternal dietary FA (as reflected in maternal red blood cells (RBC) composition) influenced HM n-6 and n-3 FAs, and whether the HM n-6/n-3 ratio was associated with changes in infant adipose deposition between 2-weeks and 4-months postpartum...
November 23, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27871875/pyruvate-dehydrogenase-has-a-major-role-in-mast-cell-function-and-its-activity-is-regulated-by-mitochondrial-mitf
#20
Israa Sharkia, Tal Hadad Erlich, Nadine Landolina, Miri Assayag, Alex Motzik, Inbal Rachmin, Gillian Kay, Ziv Porat, Sagi Tshori, Neville Berkman, Francesca Levi-Schaffer, Ehud Razin
BACKGROUND: We have recently observed that OXPHOS mediated ATP production is essential for mast cell function. Pyruvate dehydrogenase (PDH) is the main regulator of the Krebs cycle and is located upstream to the electron transport chain. However, the role of PDH in mast cell function has not been described. Microphthalmia transcription factor (MITF) regulates the development, number and function of mast cells. The localization of MITF to the mitochondria and its interaction with mitochondrial proteins has not been explored...
November 18, 2016: Journal of Allergy and Clinical Immunology
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