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https://www.readbyqxmd.com/read/29786742/a-novel-alendronate-functionalized-nanoprobe-for-simple-colorimetric-detection-of-cancer-associated-hypercalcemia
#1
Abhishek Sahu, Youngmin Hwang, Cristian Vilos, Jong-Min Lim, Sunghyun Kim, Won Il Choi, Giyoong Tae
The calcium (Ca2+) ion concentration in the blood serum is tightly regulated, and any abnormalities in the level of serum calcium ions are associated with many potentially dangerous diseases. Thus, monitoring of the Ca2+ ion concentration in the blood serum is of fundamental importance. Gold nanoparticle (GNP)-based colorimetric biosensors have enormous potential in clinical diagnostic applications due to their simplicity, versatility, and unique optical properties. In this study, we have developed an alendronate functionalized gold nanoparticle (GNP-ALD) system for the measurement of Ca2+ ion concentration in biological samples...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786656/temperature-effects-on-force-and-actin%C3%A2-myosin-interaction-in-muscle-a-look-back-on-some-experimental-findings
#2
REVIEW
K W Ranatunga
Observations made in temperature studies on mammalian muscle during force development, shortening, and lengthening, are re-examined. The isometric force in active muscle goes up substantially on warming from less than 10 °C to temperatures closer to physiological (>30 °C), and the sigmoidal temperature dependence of this force has a half-maximum at ~10 °C. During steady shortening, when force is decreased to a steady level, the sigmoidal curve is more pronounced and shifted to higher temperatures, whereas, in lengthening muscle, the curve is shifted to lower temperatures, and there is a less marked increase with temperature...
May 22, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29786114/endothelium-dependent-vasodilation-in-the-cerebral-arterioles-of-rats-deteriorates-during-acute-hyperglycemia-and-then-is-restored-by-reducing-the-glucose-level
#3
Kazuhiro Kito, Kumiko Tanabe, Koji Sakata, Naokazu Fukuoka, Kiyoshi Nagase, Mami Iida, Hiroki Iida
PURPOSE: Acute hyperglycemia in patients with traumatic brain injury correlates with a poor neurological outcome. We investigated the endothelium function of rat cerebral arterioles during acute hyperglycemia and after reducing the glucose levels using insulin. We also examined whether or not oxidative stress was involved in the cerebral arteriole response to acute hyperglycemia. METHODS: In isoflurane-anesthetized, mechanically ventilated rats, we used closed cranial window preparation to measure the changes in the pial arteriolar diameter following the topical application of acetylcholine (ACh) or adenosine...
May 21, 2018: Journal of Anesthesia
https://www.readbyqxmd.com/read/29786071/dopamine-d2-receptor-restricts-astrocytic-nlrp3-inflammasome-activation-via-enhancing-the-interaction-of-%C3%AE-arrestin2-and-nlrp3
#4
Jialei Zhu, Zhaoli Hu, Xiaojuan Han, Dongshuo Wang, Qingling Jiang, Jianhua Ding, Ming Xiao, Cong Wang, Ming Lu, Gang Hu
Astrocytes are involved in the neuroinflammation of neurodegenerative diseases, such as Parkinson's disease (PD). Among the numerous inflammatory cytokines, interleukin-1β (IL-1β) produced by astrocytic Nod-like receptor protein (NLRP) inflammasome is crucial in the pathogenesis of PD. β-arrestin2-mediated dopamine D2 receptor (Drd2) signal transduction has been regarded as a potential anti-inflammatory target. Our previous study revealed that astrocytic Drd2 suppresses neuroinflammation in the central nervous system...
May 21, 2018: Cell Death and Differentiation
https://www.readbyqxmd.com/read/29784881/structural-basis-for-adp-dependent-glucokinase-inhibition-by-8-bromo-substituted-adenosine-nucleotide
#5
Przemyslaw Grudnik, Marcin M Kaminski, Krzysztof P Rembacz, Katarzyna Kuska, Mariusz Madej, Jan Potempa, Maciej Dawidowski, Grzegorz Dubin
In higher eukaryotes, several ATP-utilizing enzymes known as hexokinases activate glucose in the glycolysis pathway by phosphorylation to glucose-6-phosphate. In contrast to canonical hexokinases which use ATP, ADP-dependent glucokinase (ADPGK) catalyzes non-canonical phosphorylation of glucose to glucose-6-phosphate using ADP as a phosphate donor. Initially discovered in Archaea, the human homolog of ADPGK was described only recently. ADPGK's involvement in modified bioenergetics of activated T cells has been postulated and elevated ADPGK expression has been reported in various cancer tissues...
May 21, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29784786/two-ck1%C3%AE-transcripts-regulated-by-m6a-methylation-code-for-two-antagonistic-kinases-in-the-control-of-the-circadian-clock
#6
Jean-Michel Fustin, Rika Kojima, Kakeru Itoh, Hsin-Yi Chang, Ye Shiqi, Bowen Zhuang, Asami Oji, Shingo Gibo, Rajesh Narasimamurthy, David Virshup, Gen Kurosawa, Masao Doi, Ichiro Manabe, Yasushi Ishihama, Masahito Ikawa, Hitoshi Okamura
The N 6 -methylation of internal adenosines (m6A) in mRNA has been quantified and localized throughout the transcriptome. However, the physiological significance of m6A in most highly methylated mRNAs is unknown. It was demonstrated previously that the circadian clock, based on transcription-translation negative feedback loops, is sensitive to the general inhibition of m6A. Here, we show that the Casein Kinase 1 Delta mRNA ( Ck1δ ), coding for a critical kinase in the control of circadian rhythms, cellular growth, and survival, is negatively regulated by m6A...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29784743/new-therapies-for-ovarian-cancer
#7
Deborah K Armstrong
In the latest NCCN Guidelines for Ovarian Cancer, the histologic subtypes of ovarian cancer are described in more depth as they vary by frequency, typical age and disease stage at presentation, treatment recommendations, and survival probabilities. The less common subtypes are also discussed. The update with the greatest impact on the treatment of ovarian cancer, however, is probably the use of maintenance therapy with poly(adenosine diphosphate-ribose) polymerase (PARP) inhibitors, and 3 PARP inhibitors are now included in the guidelines...
May 2018: Journal of the National Comprehensive Cancer Network: JNCCN
https://www.readbyqxmd.com/read/29784442/evaluation-of-adenosine-triphosphate-test-for-cleaning-assessment-of-gastroscopes-and-the-effect-on-workload-in-a-busy-endoscopy-center
#8
Cristiane Schmitt, Amanda Luiz Pires Maciel, Icaro Boszczowski, Thaís Pereira da Silva, Eliane Aparecida Job Neves, Giulio Fabio Rossini, Camila Rizek, Silvia Figueiredo Costa, Rogério Ferreira Lourenço, Michelle J Alfa
OBJECTIVE: Using adenosine triphosphate (ATP) tests to assess manual cleaning of gastroscopes and to determine the associated workload in a busy endoscopy unit. METHODS: Patient-used gastroscopes were sampled before and after cleaning to assess ATP levels, bioburden, and protein. Samples were collected by flushing 20 mL of sterile water through the biopsy port to the distal end. Time spent for reprocessing and performing the ATP test was recorded. RESULTS: Twenty-four samples were collected from 10 gastroscopes...
May 18, 2018: American Journal of Infection Control
https://www.readbyqxmd.com/read/29784355/highly-selective-and-sensitive-chemiluminescence-biosensor-for-adenosine-detection-based-on-carbon-quantum-dots-catalyzing-luminescence-released-from-aptamers-functionalized-graphene-magnetic-%C3%AE-cyclodextrin-polymers
#9
Yuanling Sun, Chaofan Ding, Yanna Lin, Weiyan Sun, Hao Liu, Xiaodong Zhu, Yuxue Dai, Chuannan Luo
In this work, a highly selective and sensitive chemiluminescence (CL) biosensor was prepared for adenosine (AD) detection based on carbon quantum dots (CQDs) catalyzing the CL system of luminol-H2 O2 under alkaline environment and CQDs was released from the surface of AD aptamers functionalized graphene @ magnetic β-cyclodextrin polymers (GO@Fe3 O4 @β-CD@A-Apt). Firstly, GO@Fe3 O4 @β-CD and CQDs were prepared and characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), UV-Vis absorption spectra (UV), fluorescence spectra (FL), fourier transform infrared (FTIR) and X-ray powder diffraction (XRD)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783743/cell-propagation-of-cholera-toxin-cta-adp-ribosylating-factor-by-exosome-mediated-transfer
#10
Cristiana Zanetti, Angelo Gallina, Alessia Fabbri, Sofia Parisi, Angela Palermo, Katia Fecchi, Zaira Boussadia, Maria Carollo, Mario Falchi, Luca Pasquini, Maria Luisa Fiani, Massimo Sargiacomo
In this study, we report how the cholera toxin (CT) A subunit (CTA), the enzyme moiety responsible for signaling alteration in host cells, enters the exosomal pathway, secretes extracellularly, transmits itself to a cell population. The first evidence for long-term transmission of CT's toxic effect via extracellular vesicles was obtained in Chinese hamster ovary (CHO) cells. To follow the CT intracellular route towards exosome secretion, we used a novel strategy for generating metabolically-labeled fluorescent exosomes that can be counted by flow cytometry assay (FACS) and characterized...
May 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29783600/re-long-term-treatment-with-the-beta-3-adrenocepter-agonist-mirabegron-ameliorates-detrusor-overactivity-and-restores-cyclic-adenosine-monophosphate-camp-levels-in-obese-mice
#11
https://www.readbyqxmd.com/read/29782858/the-antidepressant-effects-of-%C3%A9-tocopherol-are-related-to-activation-of-autophagy-via-the-ampk-mtor-pathway
#12
Xiaoyan Huang, Haoran Wu, Ruizhi Jiang, Guangda Sun, Jiali Shen, Mengling Ma, Chuanhui Ma, Shijia Zhang, Zhiheng Huang, Qinan Wu, Gang Chen, Weiwei Tao
The purpose of the present study was to investigate whether ɑ-tocopherol exhibited neuro-protective effects in chronic unpredictable mild stress (CUMS) mice through the regulation of autophagy. Deficits in behavioural tests, including a sucrose preference test, open field test, forced swim test, and tail suspension test, were ameliorated following ɑ-tocopherol administration. To study the potential mechanism, western blots were performed on both prefrontal cortex and hippocampus samples. Similar to the degree of autophagy, the activities of adenosine monophosphate-activated protein kinase (AMPK) and Unci-51 like autophagy activating kinase-1 (ULK1) were decreased after CUMS stimulation...
May 18, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29782652/adenosine-methylation-as-a-molecular-imprint-defining-the-fate-of-rna
#13
REVIEW
Philip Knuckles, Marc Bühler
Multiple lines of evidence suggest the RNA modification N6 -methyladonsine (m6 A), which is installed in the nucleus co-transcriptionally and, thereafter, serves as a reversible chemical imprint that influences several steps of mRNA metabolism. This includes but is not limited to RNA folding, splicing, stability, transport, and translation. In this Review we focus on the current view of the nuclear installation of m6 A as well the molecular players involved, the so called m6 A writers. We also explore the effector proteins, or m6 A readers, that decode the imprint in different cellular contexts and compartments, and ultimately, the way the modification influences the lifecycle of an RNA molecule...
May 21, 2018: FEBS Letters
https://www.readbyqxmd.com/read/29782621/darpp-32-and-t-darpp-promote-non-small-cell-lung-cancer-growth-through-regulation-of-ikk%C3%AE-dependent-cell-migration
#14
Sk Kayum Alam, Matteo Astone, Ping Liu, Stephanie R Hall, Abbygail M Coyle, Erin N Dankert, Dane K Hoffman, Wei Zhang, Rui Kuang, Anja C Roden, Aaron S Mansfield, Luke H Hoeppner
Lung cancer is the leading cause of cancer-related death worldwide. Here we demonstrate that elevated expression of dopamine and cyclic adenosine monophosphate-regulated phosphoprotein, Mr 32000 (DARPP-32) and its truncated splice variant t-DARPP promote lung tumor growth, while abrogation of DARPP-32 expression in human non-small cell lung cancer (NSCLC) cells reduces tumor growth in orthotopic mouse models. We observe a novel physical interaction between DARPP-32 and inhibitory kappa B kinase-α (IKKα) that promotes NSCLC cell migration through non-canonical nuclear factor kappa-light-chain-enhancer of activated B cells 2 (NF-κB2) signaling...
2018: Communications biology
https://www.readbyqxmd.com/read/29782563/repurposing-established-cyclic-adenosine-monophosphate-reducing-agents-for-the-prevention-and-therapy-of-epidermal-growth-factor-receptor-inhibitor-resistance-in-non-small-cell-lung-cancer
#15
EDITORIAL
https://www.readbyqxmd.com/read/29782215/detection-of-a-vita-pamp-stings-cells-into-reticulophagy
#16
Julien Moretti, J Magarian Blander
Phagocytes cope with the threat of living bacteria via detection of vita-PAMPs, a specific class of pathogen-associated molecular patterns (PAMPs) that denotes microbial viability and trigger a commensurate innate response. Prokaryotic mRNA and cyclic-di-adenosine monophosphate (c-di-AMP) serve as vita-PAMPs for Gram-negative and Gram-positive bacteria, respectively, and elicit heightened proinflammatory responses not warranted for dead bacteria. The innate sensor TMEM173/STING detects c-di-AMP produced by internalized live Gram-positive bacteria, and quickly mobilizes interdependent pre-formed cell-autonomous responses including endoplasmic reticulum (ER) stress, MTOR inactivation, and reticulophagy...
May 21, 2018: Autophagy
https://www.readbyqxmd.com/read/29782174/expression-of-concentrative-nucleoside-transporters-slc28a-in-the-human-placenta-effects-of-gestation-age-and-prototype-differentiation-affecting-agents
#17
Lucie Jiraskova, Lukas Cerveny, Sara Karbanova, Zuzana Ptackova, Frantisek Staud
Equilibrative ( SLC29A) and concentrative ( SLC28A) nucleoside transporters contribute to proper placental development and mediate uptake of nucleosides/nucleoside-derived drugs. We analyzed placental expression of SLC28A mRNA during gestation. Moreover, we studied in choriocarcinoma-derived BeWo cells whether SLC29A and SLC28A mRNA levels can be modulated by activity of adenylyl cyclase, retinoic acid receptor activation, CpG islands methylation, or histone acetylation, using forskolin, all- trans-retinoic acid, and 5-azacytidine, and sodium butyrate/sodium valproate, respectively...
May 21, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29782154/miclip-mapseq-a-substrate-identification-approach-for-radical-sam-rna-methylating-enzymes
#18
Vanja Stojković, Tongyue Chu, Gabriel Therizols, David E Weinberg, Danica Galonić Fujimori
Although present across bacteria, the large family of radical SAM RNA methylating enzymes is largely uncharacterized. Escherichia coli RlmN, the founding member of the family, methylates an adenosine in 23S rRNA and several tRNAs to yield 2-methyladenosine (m2A). However, varied RNA substrate specificity among RlmN enzymes, combined with the ability of certain family members to generate 8-methyladenosine (m8A), makes functional predictions across this family challenging. Here, we present a method for unbiased substrate identification that exploits highly efficient, mechanism-based crosslinking between the enzyme and its RNA substrates...
May 21, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29781767/activities-of-purine-converting-enzymes-in-heart-liver-and-kidney-mice-ldlr-and-apo-e
#19
I M Rybakowska, B Kutryb-Zając, R Milczarek, B Łukasz, E M Slominska, R T Smolenski
Nucleotide metabolism plays a major role in a number of vital cellular processes such as energetics. This, in turn, is important in pathologies such as atherosclerosis. Three month old atherosclerotic mice with knock outs for LDLR and apolipoprotein E (ApoE) were used for the experiments. Activities of AMP-deaminase (AMPD), ecto5'-nucleotidase (e5NT), adenosine deaminase (ADA), purine nucleoside phosphorylase (PNP) were measured in heart, liver and kidney cortex and medulla by analysing conversion of substrates into products using HPLC...
May 21, 2018: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29781518/an-interesting-case-of-wide-qrs-tachycardia-with-right-bundle-branch-block-morphology-what-is-the-mechanism
#20
Krishna Kumar Mohanan Nair, Narayanan Namboodiri, Hiren Kevadiya, Ajitkumar Valaparambil
A 30 year old gentleman with no structural heart disease has been evaluated for paroxysmal palpitation with documented regular wide QRS tachycardia that has not responded to IV adenosine. Surface electrocardiogram has not shown any pre-excitation. He has been taken for an EP study after informed consent. Diagnostic catheters were placed at coronary sinus (CS), His bundle region and right ventricle (RV). During catheter manipulation a regular wide QRS tachycardia with right bundle branch block morphology (RBBB) with a tachycardia cycle length (TCL) of 400 ms and normal QRS axis similar to the clinical tachycardia got induced (Fig:1)...
May 21, 2018: Pacing and Clinical Electrophysiology: PACE
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