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https://www.readbyqxmd.com/read/28636751/using-experimentation-to-understand-the-10-year-snowshoe-hare-cycle-in-the-boreal-forest-of-north-america
#1
C J Krebs, R Boonstra, S Boutin
Population cycles have long fascinated ecologists from the time of Charles Elton in the 1920s. The discovery of large population fluctuations in undisturbed ecosystems challenged the idea that pristine nature was in a state of balance. The 10-year cycle of snowshoe hares (Lepus americanus Erxleben) across the boreal forests of Canada and Alaska is a classic cycle, recognized by fur traders for more than 300 years. Since the 1930s ecologists have investigated the mechanisms that might cause these cycles. Proposed causal mechanisms have varied from sunspots to food supplies, parasites, diseases, predation, and social behaviour...
June 21, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28632748/trimetazidine-therapy-for-diabetic-mouse-hearts-subjected-to-ex-vivo-acute-heart-failure
#2
Emilene Breedt, Lydia Lacerda, M Faadiel Essop
Acute heart failure (AHF) is the most common primary diagnosis for hospitalized heart diseases in Africa. As increased fatty acid β-oxidation (FAO) during heart failure triggers detrimental effects on the myocardium, we hypothesized that trimetazidine (TMZ) (partial FAO inhibitor) offers cardioprotection under normal and obese-related diabetic conditions. Hearts were isolated from 12-14-week-old obese male and female diabetic (db/db) mice versus lean non-diabetic littermates (db/+) controls. The Langendorff retrograde isolated heart perfusion system was employed to establish an ex vivo AHF model: a) Stabilization phase-Krebs Henseleit buffer (10 mM glucose) at 100 mmHg (25 min); b) Critical Acute Heart Failure (CAHF) phase-(1...
2017: PloS One
https://www.readbyqxmd.com/read/28630995/krebs-cycle
#3
Veneta Masson
No abstract text is available yet for this article.
June 20, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28630435/in-situ-electrical-and-thermal-monitoring-of-printed-electronics-by-two-photon-mapping
#4
Francesco Pastorelli, Nicolò Accanto, Mikkel Jørgensen, Niek F van Hulst, Frederik C Krebs
Printed electronics is emerging as a new, large scale and cost effective technology that will be disruptive in fields such as energy harvesting, consumer electronics and medical sensors. The performance of printed electronic devices relies principally on the carrier mobility and molecular packing of the polymer semiconductor material. Unfortunately, the analysis of such materials is generally performed with destructive techniques, which are hard to make compatible with in situ measurements, and pose a great obstacle for the mass production of printed electronics devices...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630053/glucose-catabolism-in-liver-tumors-induced-by-c-myc-can-be-sustained-by-various-pkm1-pkm2-ratios-and-pyruvate-kinase-activities
#5
Andrés Méndez-Lucas, Xiaolei Li, Junjie Hu, Li Che, Xinhua Song, Jiaoyuan Jia, Jingxiao Wang, Chencheng Xie, Paul C Driscoll, Darjus F Tschaharganeh, Diego F Calvisi, Mariia Yuneva, Xin Chen
Different pyruvate kinase isoforms are expressed in a tissue-specific manner, with pyruvate kinase M2 (PKM2) suggested to be the predominant isoform in proliferating cells and cancer cells. Due to differential regulation of enzymatic activities, PKM2 but not PKM1 has been thought to favor cell proliferation. However, the role of PKM2 in tumorigenesis has been recently challenged. Here we report that increased glucose catabolism through glycolysis and increased pyruvate kinase activity in c-MYC-driven liver tumors are associated with increased expression of both PKM1 and PKM2 isoforms and decreased expression of the liver-specific isoform of pyruvate kinase, PKL...
June 19, 2017: Cancer Research
https://www.readbyqxmd.com/read/28628606/splicing-stimulates-sirna-formation-at-drosophila-dna-double-strand-breaks
#6
Karin Merk, Marco Breinig, Romy Böttcher, Stefan Krebs, Helmut Blum, Michael Boutros, Klaus Förstemann
DNA double-strand breaks trigger the production of locus-derived siRNAs in fruit flies, human cells and plants. At least in flies, their biogenesis depends on active transcription running towards the break. Since siRNAs derive from a double-stranded RNA precursor, a major question is how broken DNA ends can generate matching sense and antisense transcripts. We performed a genome-wide RNAi-screen in cultured Drosophila cells, which revealed that in addition to DNA repair factors, many spliceosome components are required for efficient siRNA generation...
June 19, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28628366/culex-flavivirus-during-west-nile-virus-epidemic-and-interepidemic-years-in-chicago-united-states
#7
Christina M Newman, Bethany L Krebs, Tavis K Anderson, Gabriel L Hamer, Marilyn O Ruiz, Jeffrey D Brawn, William M Brown, Uriel D Kitron, Tony L Goldberg
Culex flavivirus (CxFV) is an insect-specific flavivirus infecting Culex mosquitoes, which are important vectors of West Nile virus (WNV). CxFV and WNV cocirculate in nature and coinfect Culex mosquitoes, including in a WNV "hotspot" in suburban Chicago. We previously identified a positive association between CxFV and WNV in mosquito pools collected from suburban Chicago in 2006. To further investigate this phenomenon, we compared the spatial and temporal distribution of CxFV during an interepidemic year (2011) and an epidemic year (2012) for WNV...
June 19, 2017: Vector Borne and Zoonotic Diseases
https://www.readbyqxmd.com/read/28624990/nutrition-literacy-among-cancer-survivors-feasibility-results-from-the-healthy-eating-and-living-against-breast-cancer-heal-bca-study-a-pilot-randomized-controlled-trial
#8
Niyati Parekh, Jieying Jiang, Marissa Buchan, Marleen Meyers, Heather Gibbs, Paul Krebs
Knowledge of nutrition among breast cancer patients is insufficient, despite their motivation to seek valid information about healthy food choices. This study examines the feasibility of nutrition education workshops for cancer survivors, to inform the design of a multi-center intervention. Fifty-nine female English-speaking breast cancer patients, who had completed treatment, were enrolled. Participants were randomized to the intervention or control group. The intervention group attended six nutrition education sessions, and the control group received brochures...
June 17, 2017: Journal of Cancer Education: the Official Journal of the American Association for Cancer Education
https://www.readbyqxmd.com/read/28624829/preoperative-c-reactive-protein-values-as-a-potential-component-in-outcome-prediction-models-of-metastasized-renal-cell-carcinoma-patients-receiving-cytoreductive-nephrectomy
#9
Charis Kalogirou, Philipp Mulfinger, Ioannis Sokolakis, Markus Krebs, Hubert Kübler, Hubertus Riedmiller, Daniel Vergho
PURPOSE: To validate preoperative C-reactive protein (CRP) levels as a prognostic marker for survival in a metastasized renal cell carcinoma (mRCC) patient cohort receiving cytoreductive nephrectomy (CN). PATIENTS AND METHODS: By chart review, 146 mRCC patients receiving CN at our tertiary referral centre from 1997 to 2015 were identified retrospectively. All relevant clinicopathological features including laboratory parameters were collected and correlated to overall survival, progression-free survival and cancer-specific survival (CSS)...
June 17, 2017: Urologia Internationalis
https://www.readbyqxmd.com/read/28622088/engineering-osteoinductive-biomaterials-by-bioinspired-synthesis-of-apatite-coatings-on-collagen-hydrogels-with-varied-pore-microarchitectures
#10
Jacqueline Lorraine Harding, Matthew Osmond, Melissa Diane Krebs
Biomaterial controlled osteoinduction is influenced by the porous microenvironment and the composition of incorporated calcium orthophosphate (CaPi) polymorphs, however for the design of materials that rival the efficacies of natural grafts a systematic approach to assessing the physicochemical properties that affects cellular differentiation is needed. In this research, we introduce a bioinspired synthetic approach to the mineralization of preformed porous collagen hydrogel scaffolds with tunable apatite coatings...
June 16, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28620613/evidence-of-divergent-amino-acid-usage-in-comparative-analyses-of-r5-and-x4-associated-hiv-1-vpr-sequences
#11
Gregory C Antell, Will Dampier, Benjamas Aiamkitsumrit, Michael R Nonnemacher, Vanessa Pirrone, Wen Zhong, Katherine Kercher, Shendra Passic, Jean Williams, Yucheng Liu, Tony James, Jeffrey M Jacobson, Zsofia Szep, Brian Wigdahl, Fred C Krebs
Vpr is an HIV-1 accessory protein that plays numerous roles during viral replication, and some of which are cell type dependent. To test the hypothesis that HIV-1 tropism extends beyond the envelope into the vpr gene, studies were performed to identify the associations between coreceptor usage and Vpr variation in HIV-1-infected patients. Colinear HIV-1 Env-V3 and Vpr amino acid sequences were obtained from the LANL HIV-1 sequence database and from well-suppressed patients in the Drexel/Temple Medicine CNS AIDS Research and Eradication Study (CARES) Cohort...
2017: International Journal of Genomics
https://www.readbyqxmd.com/read/28615447/human-retinal-pigment-epithelium-cells-prefer-proline-as-a-nutrient-and-transport-metabolic-intermediates-to-the-retinal-side
#12
Jennifer R Chao, Kaitlen Knight, Abbi L Engel, Connor Jankowski, Yekai Wang, Megan A Manson, Haiwei Gu, Danijel Djukovic, Daniel Raftery, James B Hurley, Jianhai Du
Metabolite transport is a major function for the retinal pigment epithelium (RPE) to support the neural retina. RPE dysfunction plays a significant role in retinal degenerative diseases. We have used mass spectrometry with (13)C tracers to systematically study nutrient consumption and metabolite transport in cultured human fetal RPE. LC MS/MS detected 120 metabolites in the medium from either the apical or basal side. Surprisingly, more proline is consumed than any other nutrient including glucose, taurine, lipids, vitamins, or other amino acids...
June 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28615426/modulation-of-intrinsic-resting-state-fmri-networks-in-women-with-chronic-migraine
#13
X Michelle Androulakis, Kaitlin Krebs, B Lee Peterlin, Tianming Zhang, Nasim Maleki, Souvik Sen, Chris Rorden, Priyantha Herath
OBJECTIVE: To evaluate the intrinsic resting functional connectivity of the default mode network (DMN), salience network (SN), and central executive network (CEN) network in women with chronic migraine (CM), and whether clinical features are associated with such abnormalities. METHODS: We analyzed resting-state connectivity in 29 women with CM as compared to age- and sex-matched controls. Relationships between clinical characteristics and changes in targeted networks connectivity were evaluated using a multivariate linear regression model...
June 14, 2017: Neurology
https://www.readbyqxmd.com/read/28604247/brucella-central-carbon-metabolism-an-update
#14
T Barbier, A Zúñiga-Ripa, S Moussa, H Plovier, J F Sternon, L Lázaro-Antón, R Conde-Álvarez, X De Bolle, M Iriarte, I Moriyón, J J Letesson
The brucellae are facultative intracellular pathogens causing brucellosis, an important zoonosis. Here, we review the nutritional, genetic, proteomic and transcriptomic studies on Brucella carbon uptake and central metabolism, information that is needed for a better understanding of Brucella virulence. There is no uniform picture across species but the studies suggest primary and/or secondary transporters for unknown carbohydrates, lactate, glycerol phosphate, erythritol, xylose, ribose, glucose and glucose/galactose, and routes for their incorporation to central metabolism, including an erythritol pathway feeding the pentose phosphate cycle...
June 12, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28603044/relaxation-of-isolated-guinea-pig-trachea-by-apigenin-a-constituent-of-celery-via-inhibition-of-phosphodiesterase
#15
Junn-Lain Chen, Wun-Chang Ko
Apigenin, was reported to have vasodilatory effects by inhibiting Ca(2+) influx through both voltage- and receptor-operated calcium channels, but not by inhibiting cAMP- or cGMP-phosphodiesterases (PDEs) in rat thoracic aorta. However, apigenin was reported to inhibit PDE1, 2 and 3 in guinea-pig lung and heart. The aim of this study was to clarify that guinea-pig tracheal relaxation by apigenin whether via PDE inhibition. We isometrically recorded the tension of isolated guinea-pig tracheal segments on a polygraph...
June 9, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28602540/deficiencies-in-mitochondrial-dynamics-sensitize-caenorhabditis-elegans-to-arsenite-and-other-mitochondrial-toxicants-by-reducing-mitochondrial-adaptability
#16
Anthony L Luz, Tewodros R Godebo, Latasha L Smith, Tess C Leuthner, Laura L Maurer, Joel N Meyer
Mitochondrial fission, fusion, and mitophagy are interlinked processes that regulate mitochondrial shape, number, and size, as well as metabolic activity and stress response. The fundamental importance of these processes is evident in the fact that mutations in fission (DRP1), fusion (MFN2, OPA1), and mitophagy (PINK1, PARK2) genes can cause human disease (collectively >1/10,000). Interestingly, however, the age of onset and severity of clinical manifestations varies greatly between patients with these diseases (even those harboring identical mutations), suggesting a role for environmental factors in the development and progression of certain mitochondrial diseases...
June 8, 2017: Toxicology
https://www.readbyqxmd.com/read/28599201/serum-metabolome-biomarkers-associate-low-level-environmental-perfluorinated-compound-exposure-with-oxidative-nitrosative-stress-in-humans
#17
Xiaofei Wang, Liangpo Liu, Weibing Zhang, Jie Zhang, Xiaoyan Du, Qingyu Huang, Meiping Tian, Heqing Shen
Previous in vivo and in vitro studies have linked perfluorinated compound (PFC) exposure with metabolic interruption, but the inter-species difference and high treatment doses usually make the results difficult to be extrapolated to humans directly. The best strategy for identifying the metabolic interruption may be to establish the direct correlations between monitored PFCs data and metabolic data on human samples. In this study, serum metabolome data and PFC concentrations were acquired for a Chinese adult male cohort...
June 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28593900/phellinus-rimosus-improves-mitochondrial-energy-status-and-attenuates-nephrotoxicity-in-diabetic-rats
#18
K A Rony, T A Ajith, Tony A Kuttikadan, R Blaze, K K Janardhanan
BACKGROUND: Mitochondrial dysfunction and increase in reactive oxygen species during diabetes can lead to pathological consequences in kidneys. The present study was aimed to investigate the effect of Phellinus rimosus in the streptozotocin (STZ)-induced diabetic rat renal mitochondria and the possible mechanism of protection. METHODS: Phellinus rimosus (50 and 250 mg/kg, p.o) was treated after inducing diabetes by STZ (45 mg/kg, i.p) in rats. The serum samples were subjected to creatinine and urea estimation...
April 7, 2017: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/28593484/reflux-sleeve-dilation-and-barrett-s-esophagus-after-laparoscopic-sleeve-gastrectomy-long-term-follow-up
#19
Daniel Moritz Felsenreich, Ronald Kefurt, Martin Schermann, Philipp Beckerhinn, Ivan Kristo, Michael Krebs, Gerhard Prager, Felix B Langer
BACKGROUND: Laparoscopic sleeve gastrectomy (SG) has become the most frequently performed bariatric procedure worldwide. De novo reflux might impact patients' quality of life, requiring lifelong proton pump inhibitor medication. It also increases the risk of esophagitis and formation of Barrett's metaplasia. Besides weight regain, gastroesophageal reflux disease (GERD) is the most common reason for conversion to Roux-en-Y gastric bypass. METHODS: We performed 24-h pH metries, manometries, gastroscopies, and questionnaires focusing on reflux (GIQLI, RSI) in SG patients with a follow-up of more than 10 years who did not suffer from symptomatic reflux or hiatal hernia preoperatively...
June 8, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28593367/vulvar-lichen-sclerosus-in-women-is-associated-with-lower-urinary-tract-symptoms
#20
Corina Christmann-Schmid, Melanie Hediger, Sabine Gröger, Jörg Krebs, Andreas R Günthert
INTRODUCTION AND HYPOTHESIS: Lichen sclerosus (LS) is thought to be primarily a disease of postmenopausal women. Little is reported about lower urinary tract symptoms (LUTS) in association with LS. The aims of this study were to evaluate the odds of having LS-associated LUTS and to identify the predominant type of LS-associated bladder dysfunction. METHODS: This was a cross-sectional study with two cohorts investigating the association between LS and LUTS and the predominant type of LS-associated bladder dysfunction...
June 7, 2017: International Urogynecology Journal
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