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https://www.readbyqxmd.com/read/28534877/light-enhances-the-growth-rates-of-natural-populations-of-aerobic-anoxygenic-phototrophic-bacteria
#1
Isabel Ferrera, Olga Sánchez, Eva Kolářová, Michal Koblížek, Josep M Gasol
Aerobic anoxygenic phototrophic (AAP) bacteria are microorganisms that can harvest light energy using bacteriochlorophyll a to supplement their predominantly organotrophic metabolism. Growth enhancement by light has repeatedly been demonstrated in laboratory experiments with AAP isolates. However, the ecological advantage of light utilization is unclear, as it has never been proven in the natural environment. Here, we conducted manipulation experiments in the NW Mediterranean and found that AAP bacteria display high growth rates which are controlled to a large extent by intense grazing pressure and phosphorous availability...
May 23, 2017: ISME Journal
https://www.readbyqxmd.com/read/28533932/metabolic-parameters-and-responsiveness-of-isolated-iliac-artery-in-ldlr-mice-role-of-aerobic-exercise-training
#2
Nádia F Garcia, Amanda Cs Sponton, Maria A Delbin, Juliana M Parente, Michele M Castro, Angelina Zanesco, Camila de Moraes
Physical inactivity and dyslipidemia are considered risk factors for cardiovascular diseases. There are few studies evaluating the effects of physical exercise in small-caliber artery in a model that mimics familial hypercholesterolemia. The aim of this study was to examine the effect of exercise training, at moderate intensity, on metabolic parameters and iliac artery responsiveness in LDL(-/-) mice. Sedentary (SD) and trained (TR) mice performed AET (5 days/week, 60 minutes/day at 60-70% of maximum speed) during 8 weeks...
2017: American Journal of Cardiovascular Disease
https://www.readbyqxmd.com/read/28533471/the-atypical-response-regulator-atvr-is-a-new-player-in-pseudomonas-aeruginosa-response-to-hypoxia-and-virulence
#3
Gilberto Hideo Kaihami, Leandro Carvalho Dantas Breda, José Roberto Fogaça de Almeida, Thays de Oliveira Pereira, Gianlucca Gonçalves Nicastro, Ana Laura Boechat, Sandro Rogério de Almeida, Regina Lúcia Baldini
Two-component systems are widespread in bacteria, allowing adaptation to environmental changes. The classical pathway is composed by a histidine kinase that phosphorylates an aspartate residue in the cognate response regulator (RR). RRs lacking the phosphorylable aspartate also occur, but their function and contribution during host-pathogen interaction are poorly characterized. AtvR (PA14_26570) is the only atypical response regulator with a DNA-binding domain in the opportunistic pathogen Pseudomonas aeruginosa Macrophage infection with the atvR mutant strain resulted in higher TNF-α secretion as well as increased bacterial clearance as compared to macrophages infected with the wild-type strain...
May 22, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28533262/acute-and-chronic-changes-in-rat-soleus-muscle-after-high-fat-high-sucrose-diet
#4
Kelsey H Collins, David A Hart, Ian C Smith, Anthony M Issler, Raylene A Reimer, Ruth A Seerattan, Jaqueline L Rios, Walter Herzog
The effects of obesity on different musculoskeletal tissues are not well understood. The glycolytic quadriceps muscles are compromised with obesity, but due to its high oxidative capacity, the soleus muscle may be protected against obesity-induced muscle damage. To determine the time-course relationship between a high-fat/high-sucrose (HFS) metabolic challenge and soleus muscle integrity, defined as intramuscular fat invasion, fibrosis and molecular alterations over six time points. Male Sprague-Dawley rats were fed a HFS diet (n = 64) and killed at serial short-term (3 days, 1 week, 2 weeks, 4 weeks) and long-term (12 weeks, 28 weeks) time points...
May 2017: Physiological Reports
https://www.readbyqxmd.com/read/28530517/contributions-of-body-composition-characteristics-to-critical-power-and-anaerobic-work-capacity
#5
M Travis Byrd, Jonathan Robert Switalla, Joel E Eastman, Brian J Wallace, Jody L Clasey, Haley C Bergstrom
Critical power (CP) and anaerobic work capacity (AWC) from the CP test represent distinct parameters related to metabolic characteristics of the whole body and active muscle tissue, respectively. PURPOSE: This study examined the contribution of whole body composition characteristics and local lean mass to further elucidate the differences in metabolic characteristics between CP and AWC as they relate to whole body and local factors. METHODS: Fifteen, anaerobically trained males were assessed for whole body (% body fat [%BF] and mineral-free, lean mass [LBM]) and local mineral-free thigh lean mass (TLM) composition characteristic...
May 22, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28530221/micu1-drives-glycolysis-and-chemoresistance-in-ovarian-cancer
#6
Prabir K Chakraborty, Soumyajit Banerjee Mustafi, Xunhao Xiong, Shailendra Kumar Dhar Dwivedi, Vasyl Nesin, Sounik Saha, Min Zhang, Danny Dhanasekaran, Muralidharan Jayaraman, Robert Mannel, Kathleen Moore, Scott McMeekin, Da Yang, Rosemary Zuna, Kai Ding, Leonidas Tsiokas, Resham Bhattacharya, Priyabrata Mukherjee
Cancer cells actively promote aerobic glycolysis to sustain their metabolic requirements through mechanisms not always clear. Here, we demonstrate that the gatekeeper of mitochondrial Ca(2+) uptake, Mitochondrial Calcium Uptake 1 (MICU1/CBARA1) drives aerobic glycolysis in ovarian cancer. We show that MICU1 is overexpressed in a panel of ovarian cancer cell lines and that MICU1 overexpression correlates with poor overall survival (OS). Silencing MICU1 in vitro increases oxygen consumption, decreases lactate production, inhibits clonal growth, migration and invasion of ovarian cancer cells, whereas silencing in vivo inhibits tumour growth, increases cisplatin efficacy and OS...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28528772/early-interleukin-6-enhances-hepatic-ketogenesis-in-appswe-psen1de9-mice-via-3-hydroxy-3-methylglutary-coa-synthase-2-signaling-activation-by-p38-nuclear-factor-%C3%AE%C2%BAb-p65
#7
Le Shi, Daina Zhao, Chen Hou, Yunhua Peng, Jing Liu, Shuangxi Zhang, Jiankang Liu, Jiangang Long
Alzheimer's disease (AD) is considered a multifactorial disease that affects the central nervous system and periphery. A decline in brain glucose metabolism is an early feature of AD and is accompanied by a phenotypic shift from aerobic glycolysis to ketogenesis. The liver is responsible for the generation of the ketone body. However, the mechanism that underlies hepatic ketogenesis in AD remains unclear. Here, we investigated hepatic ketogenesis during the early stage of AD pathogenesis in amyloid precursor protein (APPSWE) and presenilin (PSEN1dE9) (APP/PS1) mice...
April 26, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28527624/understanding-aerobic-anaerobic-metabolism-in-caldibacillus-debilis-through-a-comparison-with-model-organisms
#8
Scott Wushke, Victor Spicer, Xiang Li Zhang, Brian Fristensky, Oleg V Krokhin, David B Levin, Nazim Cicek, Richard Sparling
Caldibacillus debilis GB1 is a facultative anaerobe isolated from a thermophilic aero-tolerant cellulolytic enrichment culture. There is a lack of representative proteomes of facultative anaerobic thermophilic Bacillaceae, exploring aerobic/anaerobic expression. The C. debilis GB1 genome was sequenced and annotated, and the proteome characterized under aerobic and anaerobic conditions while grown on cellobiose. The draft sequence of C. debilis GB1 contains a 3,340,752 bp chromosome and a 5,386 bp plasmid distributed over 49 contigs...
April 13, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28527012/effect-of-voluntary-hypocapnic-hyperventilation-or-moderate-hypoxia-on-metabolic-and-heart-rate-responses-during-high-intensity-intermittent-exercise
#9
Kohei Dobashi, Naoto Fujii, Kazuhito Watanabe, Bun Tsuji, Yosuke Sasaki, Tomomi Fujimoto, Satoru Tanigawa, Takeshi Nishiyasu
PURPOSE: To investigate the effect of voluntary hypocapnic hyperventilation or moderate hypoxia on metabolic and heart rate responses during high-intensity intermittent exercise. METHODS: Ten males performed three 30-s bouts of high-intensity cycling [Ex1 and Ex2: constant-workload at 80% of the power output in the Wingate anaerobic test (WAnT), Ex3: WAnT] interspaced with 4-min recovery periods under normoxic (Control), hypocapnic or hypoxic (2500 m) conditions...
May 19, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28523342/exercise-capacity-before-and-after-stent-placement-for-coarctation-of-the-aorta-a-single-center-case-series
#10
Brandon D Morrical, Jason H Anderson, Nathaniel W Taggart
Over the last 15 years, stent placement has become a viable and safe alternative to surgical repair for native and recurrent coarctation of the aorta. Although patients with coarctation of the aorta often have lower exercise tolerance, there is no published data regarding the effect of coarctation stenting on exercise capacity. We aimed to determine the effect of coarctation stent placement on exercise capacity. We conducted a retrospective chart review of all patients who underwent stent placement for native or recurrent coarctation of the aorta at our institution from January 2000 to October 2012...
May 18, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/28521867/effect-of-a-single-bout-of-aerobic-exercise-on-high-fat-meal-induced-inflammation
#11
Kelly N Z Fuller, Corey M Summers, Rudy J Valentine
BACKGROUND AND AIMS: Chronic low-grade inflammation is involved in the development of metabolic disorders including atherosclerosis, type 2 diabetes (T2D) and metabolic syndrome. Aerobic exercise has been shown to be anti-inflammatory and attenuate postprandial blood lipids, however, the effect of exercise on postprandial inflammation remains unclear. The aim of this study was to determine the protective effect of a single bout of aerobic exercise against postprandial lipemia and peripheral blood mononuclear cell (PBMC) inflammation and to evaluate associations with changes in the energy-sensing enzyme, AMP-activated protein kinase (AMPK)...
June 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28515794/influence-of-a-home-based-exercise-program-on-the-urine-ph-in-elderly-female-subjects-a-secondary-analysis-of-a-randomized-controlled-trial
#12
Yuichiro Nishida, Keitaro Tanaka, Megumi Hara, Noriko Hirao, Hiroaki Tanaka, Takuro Tobina, Masaharu Ikeda, Hiroshi Yamato, Masanori Ohta
BACKGROUND: A low urine pH is a characteristic metabolic feature of metabolic syndrome and type 2 diabetes. The purpose of the current study was to investigate the effects of a 12-week home-based bench step exercise on the urine pH status of elderly female subjects. METHODS: The current study is a secondary analysis of a randomized controlled trial (RCT) in which 59 postmenopausal female subjects were randomized to either the exercise group (n = 29) or the control group (n = 30)...
2017: European Review of Aging and Physical Activity
https://www.readbyqxmd.com/read/28515169/osmoregulation-bioenergetics-and-oxidative-stress-in-coastal-marine-invertebrates-raising-the-questions-for-future-research
#13
REVIEW
Georgina A Rivera-Ingraham, Jehan-Hervé Lignot
Osmoregulation is by no means an energetically cheap process, and its costs have been extensively quantified in terms of respiration and aerobic metabolism. Common products of mitochondrial activity are reactive oxygen and nitrogen species, which may cause oxidative stress by degrading key cell components, while playing essential roles in cell homeostasis. Given the delicate equilibrium between pro- and antioxidants in fueling acclimation responses, the need for a thorough understanding of the relationship between salinity-induced oxidative stress and osmoregulation arises as an important issue, especially in the context of global changes and anthropogenic impacts on coastal habitats...
May 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28515149/pyruvate-kinase-inhibits-proliferation-during-postnatal-cerebellar-neurogenesis-and-suppresses-medulloblastoma-formation
#14
Katherine Tech, Andrey P Tikunov, Hamza Farooq, A Sorana Morrissy, Jessica Meidinger, Taylor Fish, Sarah C Green, Hedi Liu, Yisu Li, Andrew J Mungall, Richard A Moore, Yussanne Ma, Steven Jm Jones, Marco A Marra, Matthew G Vander Heiden, Michael D Taylor, Jeffrey MacDonald, Timothy R Gershon
Aerobic glycolysis supports proliferation through unresolved mechanisms. We have previously shown that aerobic glycolysis is required for the regulated proliferation of cerebellar granule neuron progenitors (CGNPs), and for the growth of CGNP-derived medulloblastoma. Blocking the initiation of glycolysis via deletion of Hexokinase-2 (Hk2) disrupts CGNP proliferation and restricts medulloblastoma growth. Here, we assessed whether disrupting Pyruvate kinase-M (Pkm), an enzyme that acts in the terminal steps of glycolysis, would alter CGNP metabolism, proliferation and tumorigenesis...
May 17, 2017: Cancer Research
https://www.readbyqxmd.com/read/28514721/impact-of-gh-administration-on-athletic-performance-in-healthy-young-adults-a-systematic-review-and-meta-analysis-of-placebo-controlled-trials
#15
REVIEW
Kasper Hermansen, Mads Bengtsen, Michael Kjær, Peter Vestergaard, Jens Otto Lunde Jørgensen
OBJECTIVE: Illicit use of growth hormone (GH) as a performance-enhancing drug among athletes is prevalent, although the evidence of such effects in healthy, young subjects is sparse. We therefore performed a meta-analysis of published studies on the effect of GH administration on body composition, substrate metabolism, and athletic performance in healthy, young subjects. DESIGN: The English-language based databases PubMed, EMBASE, and Cochrane Central Register of Controlled Trials were searched, and eligible articles were reviewed in accordance with the PRISMA guidelines...
May 10, 2017: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/28511909/discovery-and-structure-guided-fragment-linking-of-4-2-3-dichlorobenzoyl-1-methyl-pyrrole-2-carboxamide-as-a-pyruvate-kinase-m2-activator
#16
Yumi Matsui, Isao Yasumatsu, Takashi Asahi, Takahiro Kitamura, Kazuo Kanai, Osamu Ubukata, Hitoshi Hayasaka, Sachiko Takaishi, Hiroyuki Hanzawa, Shinichi Katakura
Tumor cells switch glucose metabolism to aerobic glycolysis by expressing the pyruvate kinase M2 isoform (PKM2) in a low active form, providing glycolytic intermediates as building blocks for biosynthetic processes, and thereby supporting cell proliferation. Activation of PKM2 should invert aerobic glycolysis to an oxidative metabolism and prevent cancer growth. Thus, PKM2 has gained attention as a promising cancer therapy target. To obtain novel PKM2 activators, we conducted a high-throughput screening (HTS)...
May 5, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28508297/adaptation-to-stochastic-temporal-variations-in-intratumoral-blood-flow-the-warburg-effect-as-a-bet-hedging-strategy
#17
Curtis A Gravenmier, Miriam Siddique, Robert A Gatenby
While most cancers promote ingrowth of host blood vessels, the resulting vascular network usually fails to develop a mature organization, resulting in abnormal vascular dynamics with stochastic variations that include slowing, cessation, and even reversal of flow. Thus, substantial spatial and temporal variations in oxygen concentration are commonly observed in most cancers. Cancer cells, like all living systems, are subject to Darwinian dynamics such that their survival and proliferation are dependent on developing optimal phenotypic adaptations to local environmental conditions...
May 15, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28507314/metabolic-imaging-of-energy-metabolism-in-traumatic-brain-injury-using-hyperpolarized-1-13-c-pyruvate
#18
Stephen J DeVience, Xin Lu, Julie Proctor, Parisa Rangghran, Elias R Melhem, Rao Gullapalli, Gary M Fiskum, Dirk Mayer
Traumatic brain injury (TBI) is known to cause perturbations in the energy metabolism of the brain, but current tests of metabolic activity are only indirect markers of energy use or are highly invasive. Here we show that hyperpolarized (13)C magnetic resonance spectroscopic imaging (MRSI) can be used as a direct, non-invasive method for studying the effects of TBI on energy metabolism. Measurements were performed on rats with moderate TBI induced by controlled cortical impact on one cerebral hemisphere. Following injection of hyperpolarized [1-(13)C]pyruvate, the resulting (13)C-bicarbonate signal was found to be 24 ± 6% lower in the injured hemisphere compared with the non-injured hemisphere, while the hyperpolarized bicarbonate-to-lactate ratio was 33 ± 8% lower in the injured hemisphere...
May 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28507190/the-effect-of-thermal-acclimation-on-aerobic-scope-and-critical-swimming-speed-in-atlantic-salmon-salmo-salar
#19
Malthe Hvas, Ole Folkedal, Albert Imsland, Frode Oppedal
The Atlantic salmon is extensively studied due to conservation concerns and its economic importance in aquaculture. However, a thorough report of their aerobic capacity throughout their entire thermal niche has not been described. In this study, Atlantic salmon (∼450 g) were acclimated for four weeks at 3, 8, 13, 18 or 23°C, and then tested in a large Brett-type swimming respirometer in groups of ten per trial. Both standard metabolic rate and active metabolic rate continued to increase with temperature, which resulted in an aerobic scope that also increased with temperature, but was statistically similar between 13, 18 and 23°C...
May 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28507164/reliability-of-low-power-cycling-efficiency-in-energy-expenditure-phenotyping-of-inactive-men-and-women
#20
Elie-Jacques Fares, Laurie Isacco, Cathriona R Monnard, Jennifer L Miles-Chan, Jean-Pierre Montani, Yves Schutz, Abdul G Dulloo
Standardized approaches to assess human energy expenditure (EE) are well defined at rest and at moderate to high-intensity exercise, but not at light intensity physical activities energetically comparable with those of daily life (i.e., 1.5-4 times the resting EE, i.e., 1.5-4 METs). Our aim was to validate a graded exercise test for assessing the energy cost of low-intensity dynamic work in physically inactive humans, that is, those who habitually do not meet the guidelines for moderate-to-vigorous aerobic physical activity levels...
May 2017: Physiological Reports
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