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https://www.readbyqxmd.com/read/28434079/cell-culture-complications-due-to-mechanical-release-of-atp-and-activation-of-purinoceptors
#1
REVIEW
Geoffrey Burnstock, Gillian E Knight
There is abundant evidence that ATP (adenosine 5'-triphosphate) is released from a variety of cultured cells in response to mechanical stimulation. The release mechanism involved appears to be a combination of vesicular exocytosis and connexin and pannexin hemichannels. Purinergic receptors on cultured cells mediate both short-term purinergic signalling of secretion and long-term (trophic) signalling such as proliferation, migration, differentiation and apoptosis. We aim in this review to bring to the attention of non-purinergic researchers using tissue culture that the release of ATP in response to mechanical stress evoked by the unavoidable movement of the cells acting on functional purinergic receptors on the culture cells is likely to complicate the interpretation of their data...
April 22, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28433739/dual-functional-drug-liposomes-in-treatment-of-resistant-cancers
#2
REVIEW
Li-Min Mu, Rui-Jun Ju, Rui Liu, Ying-Zi Bu, Jing-Ying Zhang, Xue-Qi Li, Fan Zeng, Wan-Liang Lu
Efficacy of regular chemotherapy is significantly hampered by multidrug resistance (MDR) and severe systemic toxicity. The reduced toxicity has been evidenced after administration of drug liposomes, consisting of the first generation of regular drug liposomes, the second generation of long-circulation drug liposomes, and the third generation of targeting drug liposomes. However, MDR of cancers remains as an unsolved issue. The objectives of this article are to review the dual-functional drug liposomes, which demonstrate the potential in overcoming MDR...
April 19, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/28433631/detection-of-camp-and-of-pka-activity-in-saccharomyces-cerevisiae-single-cells-using-fluorescence-resonance-energy-transfer-fret-probes
#3
Sonia Colombo, Serena Broggi, Maddalena Collini, Laura D'Alfonso, Giuseppe Chirico, Enzo Martegani
In Saccharomyces cerevisiae the second messenger cyclic adenosine monophosphate (cAMP) and protein kinase A (PKA) play a central role in metabolism regulation, stress resistance and cell cycle progression. To monitor cAMP levels and PKA activity in vivo in single S. cerevisiae cells, we expressed an Epac-based FRET probe and a FRET-based A-kinase activity reporter, which were proven to be useful live-cell biosensors for cAMP levels and PKA activity in mammalian cells. Regarding detection of cAMP in single yeast cells, we show that in wild type strains the CFP/YFP fluorescence ratio increased immediately after glucose addition to derepressed cells, while no changes were observed when glucose was added to a strain that is not able to produce cAMP...
April 19, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28433200/the-case-against-performing-pleural-biopsies-for-the-aetiological-diagnosis-of-exudates
#4
J M Porcel
In most cases, the etiological diagnosis of pleural exudates does not require a pleural biopsy. However, when it is considered necessary, the biopsy should seldom be conducted using invasive methods such as thoracoscopy. Two paradigmatic examples are pleural tuberculosis and malignant effusions. In many centres, pleural fluid adenosine deaminase measurement has replaced closed pleural biopsies in the diagnosis of tuberculosis. Similarly, pathological and molecular studies on pleural fluid cell blocks or alternatively, image-guided pleural biopsies have drastically reduced the need for thoracoscopy...
April 19, 2017: Revista Clínica Española
https://www.readbyqxmd.com/read/28432753/identification-of-indothiazinone-as-a-natural-antiplatelet-agent
#5
Chansik Yang, Sugyeong Kwon, Se-Jong Kim, Minseon Jeong, Ji-Young Park, Dongeun Park, Soon Jun Hong, Jong-Wha Jung, Chungho Kim
Cardiovascular disease, which is caused by unregulated platelet aggregation, is one of the main causes of deaths worldwide. Many studies have focused on natural products with antiplatelet effects as a safe alternative therapy in order to prevent the disease. In this context, an in-house chemical library was screened to find natural products capable of inhibiting the interaction between platelet integrin αIIbβ3 and fibrinogen, which is an essential step in platelet aggregation. On the basis of the screening results, indothiazinone, an alkaloid found in microbial cultures, was identified as a potential antiplatelet agent...
April 22, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28432673/prognostic-value-of-left-ventricular-dyssynchrony-evaluated-by-gated-myocardial-perfusion-imaging-in-patients-with-chronic-kidney-disease-and-normal-perfusion-defect-scores
#6
Hiroaki Mori, Satoshi Isobe, Susumu Suzuki, Kazumasa Unno, Ryota Morimoto, Naoaki Kano, Takahiro Okumura, Yoshinari Yasuda, Katsuhiko Kato, Toyoaki Murohara
BACKGROUND: This study aimed to investigate whether indices of left ventricular (LV) dyssynchrony by gated myocardial perfusion SPECT (GMPS) could be useful to predict prognosis in chronic kidney disease (CKD) patients with normal perfusion defect scores. METHODS: One hundred and sixty-seven CKD patients with normal perfusion defect scores on adenosine-stress (201)Tl GMPS and no previous history of overt heart diseases were enrolled. Phase standard deviation (PSD) and bandwidth (BW) were automatically calculated from GMPS...
April 21, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28432556/enzymes-that-hydrolyze-adenine-nucleotides-in-a-model-of-hypercholesterolemia-induced-by-triton-wr-1339-protective-effects-of-%C3%AE-caryophyllene
#7
Matheus D Baldissera, Carine F Souza, Pedro H Doleski, Daniela B R Leal, Lenita M Stefani, Aline A Boligon, Silvia G Monteiro
Purinergic system has been proven to play a critical role in the inflammatory process and to represent an important therapeutic target to improve the immune response during hypercholesterolemia. β-caryophyllene, a phytocannabinoid compound, has a powerful hypolipidemic and anti-inflammatory actions. However, the effects of β-caryophyllene on seric enzymes of purinergic system have not been evaluated. The purpose of this study was to investigate whether β-caryophyllene is able to ameliorate the seric activities of NTPDase and adenosine deaminase (ADA) in a model of hypercholesterolemia induced by Triton WR-1339...
April 21, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28432149/cd73-on-t-cells-orchestrates-cardiac-wound-healing-after-myocardial-infarction-by-purinergic-metabolic-reprogramming
#8
Nadine Borg, Christina Alter, Nicole Görldt, Christoph Jacoby, Zhaoping Ding, Bodo Steckel, Christine Quast, Florian Bönner, Daniela Friebe, Sebastian Temme, Ulrich Flögel, Jürgen Schrader
Background -T-cells are required for proper healing after myocardial infarction. The mechanism of their beneficial action, however, is unknown. The pro-inflammatory "danger signal" adenosine triphosphate (ATP), released from damaged cells, is degraded by the ectonucleotidases CD39 and CD73 to the anti-inflammatory mediator adenosine. Here, we investigate the contribution of CD73-derived adenosine produced by T-cells to cardiac remodeling after ischemia/reperfusion and define its mechanism of action. Methods -Myocardial ischemia (50 min /reperfusion) was induced in global CD73(-/-) and CD4-CD73(-/-) mice...
April 21, 2017: Circulation
https://www.readbyqxmd.com/read/28431224/adp-ribosylation-goes-normal-serine-as-the-major-site-of-the-modification
#9
Qiang Liu, Bogdan I Florea, Dmitri V Filippov
Proteins containing adenosine diphosphate ribosylserine as a posttranslational modification are widespread and formed via HPF1-assisted, PARP-1-mediated PARylation as Bonfiglio et al. (2017) report in a recent issue of Molecular Cell.
April 20, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28431073/dormant-pulmonary-vein-conduction-before-ablation-revealed-by-adenosine-evidence-for-intermittent-venoatrial-conduction
#10
Patrizio Pascale, Laurent Roten, Etienne Pruvot
No abstract text is available yet for this article.
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28431050/role-of-adenosine-guided-pulmonary-vein-isolation-in-patients-undergoing-catheter-ablation-for-atrial-fibrillation-a-meta-analysis
#11
Yi-He Chen, Hui Lin, Cheng-Long Xie, Jian-Wen Hou, Yi-Gang Li
Aims: Adenosine had been reported to unmask dormant conduction and thus identify pulmonary vein at risk of reconnection. However, the role of adjunctive adenosine infusion after pulmonary vein isolation (PVI) on long-term arrhythmia-free survival was still contentious. The purpose of the present meta-analysis was to assess the association of adenosine testing with long-term ablation success in patients with atrial fibrillation (AF) (i.e. freedom from AF recurrence). Methods and Results: We systematically searched the electronic databases and finally included 10 studies, with 1771 patients undergoing adenosine-guided PVI and 1787 patients undergoing conventional PVI...
April 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28430591/poly-adenosine-diphosphate-ribose-polymerase-as-therapeutic-target-lessons-learned-from-its-inhibitors
#12
REVIEW
Anna Mária Cseh, Zsolt Fábián, Balázs Sümegi, Luca Scorrano
Poly(ADP-ribose) polymerases are a family of DNA-dependent nuclear enzymes catalyzing the transfer of ADP-ribose moieties from cellular nicotinamide-adenine-dinucleotide to a variety of target proteins. Although they have been considered as resident nuclear elements of the DNA repair machinery, recent works revealed a more intricate physiologic role of poly(ADP-ribose) polymerases with numerous extranuclear activities. Indeed, poly(ADP-ribose) polymerases participate in fundamental cellular processes like chromatin remodelling, transcription or regulation of the cell-cycle...
April 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/28429991/effects-of-medium-chain-triglycerides-on-intestinal-morphology-and-energy-metabolism-of-intrauterine-growth-retarded-weanling-piglets
#13
Li-Li Zhang, Hao Zhang, Yue Li, Tian Wang
It has been shown that there is a relationship between intrauterine growth retardation (IUGR) and postnatal intestinal damage involved in energy deficits. Therefore, the present study was conducted to investigate the effect of medium-chain triglycerides (MCT) on the intestinal morphology, intestinal function and energy metabolism of piglets with IUGR. At weaning (21 ± 1.1 d of age), 24 IUGR piglets and 24 normal birth weight (NBW) piglets were selected according to their birth weights (BW) (IUGR: 0.95 ± 0...
June 2017: Archives of Animal Nutrition
https://www.readbyqxmd.com/read/28429528/use-of-adenosine-to-shorten-the-post-ablation-waiting-period-for-cavotricuspid-isthmus-dependent-atrial-flutter
#14
Gustavo Morales, Yousef H Darrat, Nicolas Lellouche, Sun Moon Kim, Muhammad Butt, Katrina Bidwell, William Lippert, Gbolahan Ogunbayo, David Hamon, Luigi Di Biase, Andrea Natale, Kevin Parrott, Claude S Elayi
BACKGROUND: Dormant conduction unmasked by adenosine predicts clinical recurrences of cavotricuspid isthmus (CTI) dependent atrial flutter following catheter ablation. Conventional practice involves a waiting period of 20 to 30 minutes after achievement of a bidirectional line of block (BDB) to monitor for recovery of conduction. OBJECTIVE: Assess whether abolition of dormant conduction with adenosine immediately after CTI ablation and BDB can predict the lack of CTI conduction recovery during the following 30 minutes...
April 21, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28429411/nanodiscs-for-inpharma-nmr-characterization-of-gpcrs-ligand-binding-to-the-human-a2a-adenosine-receptor
#15
Kai Fredriksson, Philip Lottmann, Sonja Hinz, Iounut Onila, Aliaksei Shymanets, Christian Harteneck, Christa E Müller, Christian Griesinger, Thomas E Exner
G-protein-coupled-receptors (GPCRs) are of fundamental importance for signal transduction through cell membranes. This makes them important drug targets, but structure-based drug design (SBDD) is still hampered by the limitations for structure determination of unmodified GPCRs. We show that the interligand NOEs for pharmacophore mapping (INPHARMA) method can provide valuable information on ligand poses inside the binding site of the unmodified human A2A adenosine receptor reconstituted in nanodiscs. By comparing experimental INPHARMA spectra with back-calculated spectra based on ligand poses obtained from molecular dynamics simulations, a complex structure for A2A R with the low-affinity ligand 3-pyrrolidin-1-ylquinoxalin-2-amine was determined based on the X-ray structure of ligand ZM-241,358 in complex with a modified A2A R...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28429285/the-organogermanium-compound-ge-132-interacts-with-nucleic-acid-components-and-inhibits-the-catalysis-of-adenosine-substrate-by-adenosine-deaminase
#16
Yasuhiro Shimada, Katsuyuki Sato, Tomoya Takeda, Yoshihiko Tokuji
Poly-trans-[(2-carboxyethyl)germasesquioxane] (Ge-132) is a water-soluble organogermanium compound that exerts various physiological effects, including anti-inflammatory activity and pain relief. In water, Ge-132 is hydrolyzed to 3-(trihydroxygermyl)propanoic acid (THGP), which in turn is capable of interacting with cis-diol compounds through its trihydroxy group, indicating that this compound could also interact with diol-containing nucleic acid constituents. In this study, we evaluated the ability of THGP to interact with nucleosides or nucleotides via nuclear magnetic resonance (NMR) analysis...
April 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28429038/-phosphodiesterase-4-inhibition-for-treatment-of-endothelial-barrier-and-microcirculation-disorders-in-sepsis
#17
REVIEW
J Wollborn, N Schlegel, M A Schick
Sepsis is commonly associated with loss of microvascular endothelial barrier function (capillary leak) and dysfunctional microcirculation, which both promote organ failure. The development of a distinct therapy of impaired endothelial barrier function and disturbed microcirculation is highly relevant because both of these phenomena constitute crucial processes which critically influence the prognosis of patients. Numerous in vivo and in vitro trials over the past years have fostered a better understanding of the pathophysiology of capillary leak...
April 20, 2017: Der Anaesthesist
https://www.readbyqxmd.com/read/28427869/ischemic-preconditioning-with-ketogenic-diet-improves-brain-ischemic-tolerance-through-increased-extracellular-adenosine-levels-and-hypoxia-inducible-factors
#18
Qi Yang, Min Guo, Xun Wang, Yanxin Zhao, Hongyan Ding, Mei Cui, Qiang Dong
Achieving a prolonged neuroprotective state reduces brain damage and neurological dysfunction characteristic of brain ischemia. The ketogenic diet (KD) has disease-modifying effects in several neurodegenerative disorders. In this study, we fed mice with KD for three weeks and performed reversible middle cerebral artery occlusion (MCAO) in the animals. KD-fed mice had significantly reduced infarct volume, increased regional cerebral blood flow (rCBF) and extracellular adenosine levels in both ischemic and reperfusion stages...
April 18, 2017: Brain Research
https://www.readbyqxmd.com/read/28427701/multiple-sclerosis-showing-elevation-of-adenosine-deaminase-levels-in-the-cerebrospinal-fluid
#19
Miharu Samuraki, Kenji Sakai, Yasuko Odake, Mitsuhiro Yoshita, Kouichi Misaki, Mitsutoshi Nakada, Masahito Yamada
An 80-year-old man developed dysarthria, quadriplegia, sensory disturbance and ataxia in all limbs. Brain and spinal magnetic resonance imaging (MRI) revealed multiple enhanced lesions. Cerebrospinal fluid (CSF) levels of adenosine deaminase (ADA) remarkably elevated. Tuberculosis DNA was not detected, and tuberculosis was not cultured either in the CSF. Brain biopsy revealed the inflammatory demyelinating lesions. With the diagnosis of multiple sclerosis, corticosteroid therapy resulted in rapid improvement of his symptoms and MRI abnormalities...
April 2017: Multiple Sclerosis and related Disorders
https://www.readbyqxmd.com/read/28427557/oxidative-stress-love-and-hate-history-in-central-nervous-system
#20
Genaro Gabriel Ortiz, Fermín P Pacheco Moisés, Mario Mireles-Ramírez, Luis J Flores-Alvarado, Héctor González-Usigli, Víctor J Sánchez-González, Angélica L Sánchez-López, Lorenzo Sánchez-Romero, Eduardo I Díaz-Barba, J Francisco Santoscoy-Gutiérrez, Paloma Rivero-Moragrega
Molecular oxygen is essential for aerobic organisms in order to synthesize large amounts of energy during the process of oxidative phosphorylation and it is harnessed in the form of adenosine triphosphate, the chemical energy of the cell. Oxygen is toxic for anaerobic organisms but it is also less obvious that oxygen is poisonous to aerobic organisms at higher concentrations of oxygen. For instance, oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen at increased partial pressures...
2017: Advances in Protein Chemistry and Structural Biology
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