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https://www.readbyqxmd.com/read/28641173/population-dynamics-of-electrogenic-microbial-communities-in-microbial-fuel-cells-started-with-three-different-inoculum-sources
#1
Shun'ichi Ishii, Shino Suzuki, Yuko Yamanaka, Angela Wu, Kenneth H Nealson, Orianna Bretschger
Microbial fuel cells (MFCs) are one of the bioelectrochemical systems that exploit microorganisms as biocatalysts to degrade organic matters and recover energy as electric power. Here, we explored how the established electrogenic microbial communities were influenced by three different inoculum sources; anaerobic sludge of the wastewater plant, rice paddy field soil, and coastal lagoon sediment. We periodically characterized both electricity generation with sucrose consumption and 16S rRNA-basis microbial community composition...
June 15, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28641070/elmo-proteins-transduce-g-protein-coupled-receptor-signal-to-control-reorganization-of-actin-cytoskeleton-in-chemotaxis-of-eukaryotic-cells
#2
Xuehua Xu, Tian Jin
Chemotaxis, which is chemoattractant-guided directional cell migration, plays major roles in recruitment of neutrophils, the metastasis of cancer cells, and the development of the model organism Dictyostelium discoideum. These cells share remarkable similarities in the signaling pathways by which they control chemotaxis. They all use a G protein-coupled receptor (GPCR)-mediated signal transduction pathway to sense the chemotactic gradient to guide cell migration. Diverse chemokines activate Rac through conserved GPCR signaling pathways...
June 22, 2017: Small GTPases
https://www.readbyqxmd.com/read/28641010/alpha-mangostin-reverses-multidrug-resistance-by-attenuating-the-function-of-the-multidrug-resistance-linked-abcg2-transporter
#3
Chung-Pu Wu, Sung-Han Hsiao, Megumi Murakami, Yu-Jen Lu, Yan-Qing Li, Yang-Hui Huang, Tai-Ho Hung, Suresh V Ambudkar, Yu-Shan Wu
The ATP-binding cassette (ABC) drug transporter ABCG2 can actively efflux a wide variety of chemotherapeutic agents out of cancer cells and subsequently reduce the intracellular accumulation of these drugs. Therefore, the overexpression of ABCG2 often contributes to the development of multidrug resistance (MDR) in cancer cells, which is one of the major obstacles to successful cancer chemotherapy. Moreover, ABCG2 is highly expressed in various tissues including the intestine and blood-brain barrier (BBB), limiting the absorption and bioavailability of many therapeutic agents...
June 22, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28640697/current-clinical-challenges-in-childhood-ependymoma-a-focused-review
#4
Thomas E Merchant
Ependymoma is a locally aggressive tumor with metastatic potential that arises in diverse locations throughout the brain and spine in children. Tumor and treatment may result in significant morbidity. Cure remains elusive for many patients owing to diverse biology and resistance to conventional therapy. The implementation of systematic postoperative irradiation in clinical trials during the past 20 years has increased the proportion of patients achieving durable disease control with excellent results, as measured by objective functional outcome measures...
June 22, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28640638/enzyme-mediated-conversion-of-fad-to-8-formyl-fad-in-formate-oxidase-results-in-modified-cofactor-with-enhanced-catalytic-properties
#5
John M Robbins, Michael G Souffrant, Donald Hamelberg, Giovanni Gadda, Andreas S Bommarius
Flavins, including flavin adenine dinucleotide (FAD), are fundamental catalytic cofactors responsible for the redox functionality of a diverse set of proteins. Alternatively, modified flavin analogues are rarely found in nature as their incorporation typically results in inactivation of flavoproteins, thus leading to the disruption of important cellular pathways. Here, we report that the fungal flavoenzyme formate oxidase (FOX) catalyzes the slow conversion of non-covalently bound FAD to 8-formyl FAD (8-fFAD), and that this conversion results in a nearly 10-fold increase in formate oxidase activity...
June 22, 2017: Biochemistry
https://www.readbyqxmd.com/read/28640626/photocatalytic-hydrazonyl-radical-mediated-radical-cyclization-allylation-cascade-synthesis-of-dihydropyrazoles-and-tetrahydropyridazines
#6
Quan-Qing Zhao, Jun Chen, Dong-Mei Yan, Jia-Rong Chen, Wen-Jing Xiao
A novel photocatalytic hydrazonyl radical-mediated radical cyclization/allylation cascade reaction of β,γ-unsaturated hydrazones is developed using allyl sulfones and Morita-Baylis-Hillman adduct as allyl sources, which provides an efficient and practical access to various diversely functionalized dihydropyrazoles and tetrahydropyridazines. The reaction is enabled by controllable generation of hydrazonyl radicals via an oxidative deprotonation electron transfer strategy and selective trapping of the resultant C-centered radicals under visible light irradiation...
June 22, 2017: Organic Letters
https://www.readbyqxmd.com/read/28640624/synthesis-of-4-acylpyrazoles-from-saturated-ketones-and-hydrazones-featured-with-multiple-c-sp3-h-bond-functionalization-c-c-bond-cleavage-and-re-organization
#7
Miaomiao Tian, Xiaonan Shi, Xinying Zhang, Xuesen Fan
In this paper, an efficient and convenient one-pot synthesis of diversely substituted 4-acylpyrazole derivatives via copper-catalyzed one pot cascade reactions of saturated ketones with hydrazones is reported. Mechanistically, the formation of the title compounds involves the in situ formation of an enone intermediate through the dehydrogenation of saturated ketone, and the [2+3] cyclization of enone with hydrazone followed by an aromatization-driven C-C bond cleavage and re-organization. To our knowledge, this should be the first example in which the biologically and pharmaceutically important yet otherwise difficult-to-obtain 4-acylpyrazole derivatives were directly prepared from saturated ketones and hydrazones featured with multiple aliphatic C-H bond functionalization, C-C bond cleavage and re-organization...
June 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28637286/structure-seq2-sensitive-and-accurate-genome-wide-profiling-of-rna-structure-in-vivo
#8
Laura E Ritchey, Zhao Su, Yin Tang, David C Tack, Sarah M Assmann, Philip C Bevilacqua
RNA serves many functions in biology such as splicing, temperature sensing, and innate immunity. These functions are often determined by the structure of RNA. There is thus a pressing need to understand RNA structure and how it changes during diverse biological processes both in vivo and genome-wide. Here, we present Structure-seq2, which provides nucleotide-resolution RNA structural information in vivo and genome-wide. This optimized version of our original Structure-seq method increases sensitivity by at least 4-fold and improves data quality by minimizing formation of a deleterious by-product, reducing ligation bias, and improving read coverage...
June 16, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28636961/myeloid-cells-in-the-central-nervous-system
#9
REVIEW
Jasmin Herz, Anthony J Filiano, Ashtyn Smith, Nir Yogev, Jonathan Kipnis
The central nervous system (CNS) and its meningeal coverings accommodate a diverse myeloid compartment that includes parenchymal microglia and perivascular macrophages, as well as choroid plexus and meningeal macrophages, dendritic cells, and granulocytes. These myeloid populations enjoy an intimate relationship with the CNS, where they play an essential role in both health and disease. Although the importance of these cells is clearly recognized, their exact function in the CNS continues to be explored. Here, we review the subsets of myeloid cells that inhabit the parenchyma, meninges, and choroid plexus and discuss their roles in CNS homeostasis...
June 20, 2017: Immunity
https://www.readbyqxmd.com/read/28636959/the-enteric-network-interactions-between-the-immune-and-nervous-systems-of-the-gut
#10
REVIEW
Bryan B Yoo, Sarkis K Mazmanian
Interactions between the nervous and immune systems enable the gut to respond to the variety of dietary products that it absorbs, the broad spectrum of pathogens that it encounters, and the diverse microbiome that it harbors. The enteric nervous system (ENS) senses and reacts to the dynamic ecosystem of the gastrointestinal (GI) tract by translating chemical cues from the environment into neuronal impulses that propagate throughout the gut and into other organs in the body, including the central nervous system (CNS)...
June 20, 2017: Immunity
https://www.readbyqxmd.com/read/28636929/intrinsic-functional-connectivity-alteration-of-dorsal-and-rostral-anterior-cingulate-cortex-in-obsessive-compulsive-disorder-a-resting-fmri-study
#11
Zongfeng Zhang, Qing Fan, Yajing Zhu, Ling Tan, Yongjun Chen, Rui Gao, Haiyin Zhang, Yao Li, Zeping Xiao
Cortico-striato-thalamo-cortical (CSTC) circuit has been implicated in OCD pathophysiology by converging neuroimaging findings. The anterior cingulate cortex (ACC), as an important part within CSTC circuit, plays a critical role in OCD etiology. The ACC can be divided into dorsal and rostral parts anatomically, which are involved in cognitive process and emotional function, respectively. However, the diverse function of intrinsic signals from dorsal and rostral ACC regions remains unclear in OCD study. In this work, we applied resting-state functional magnetic resonance imaging (rs-fMRI) technology to investigate and differentiate the functional connectivity (FC) characteristics between dACC and rACC in unmedicated OCD patients...
June 18, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28636926/enhanced-human-bone-marrow-mesenchymal-stromal-cell-adhesion-on-scaffolds-promotes-cell-survival-and-bone-formation
#12
Miryam Mebarki, Laura Coquelin, Pierre Layrolle, Séverine Battaglia, Marine Tossou, Philippe Hernigou, Hélène Rouard, Nathalie Chevallier
In order to induce an efficient bone formation with human bone marrow mesenchymal stromal cells (hBMSC) associated to a scaffold, it is crucial to determine the key points of the hBMSC action after in vivo transplantation as well as the appropriate features of a scaffold. To this aim we compared the hBMSC behavior when grafted onto two biomaterials allowing different bone potential in vivo. The cancellous devitalized Tutoplast®-processed bone (TPB) and the synthetic hydroxyapatite/β-tricalcium-phosphate (HA/βTCP) which give at 6 weeks 100% and 50% of bone formation respectively...
June 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28636924/epithelial-folding-driven-by-apical-or-basal-lateral-modulation-geometric-features-mechanical-inference-and-boundary-effects
#13
Fu-Lai Wen, Yu-Chiun Wang, Tatsuo Shibata
During embryonic development, epithelial sheets fold into complex structures required for tissue and organ functions. Although substantial efforts have been devoted to identifying molecular mechanisms underlying epithelial folding, far less is understood about how forces deform individual cells to sculpt the overall sheet morphology. Here we describe a simple and general theoretical model for the autonomous folding of monolayered epithelial sheets. We show that active modulation of intracellular mechanics along the basal-lateral as well as the apical surfaces is capable of inducing fold formation in the absence of buckling instability...
June 20, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28636917/kinesin-processivity-is-determined-by-a-kinetic-race-from-a-vulnerable-one-head-bound-state
#14
Keith J Mickolajczyk, William O Hancock
Kinesin processivity, defined as the average number of steps that occur per interaction with a microtubule, is an important biophysical determinant of the motor's intracellular capabilities. Despite its fundamental importance to the diversity of tasks that kinesins carry out in cells, no existing quantitative model fully explains how structural differences between kinesins alter kinetic rates in the ATPase cycle to produce functional changes in processivity. Here we use high-resolution single-molecule microscopy to directly observe the stepping behavior of kinesin-1 and -2 family motors with different length neck-linker domains...
June 20, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28636886/sirt1-enzymatically-potentiates-1-25-dihydroxyvitamin-d3-signaling-via-vitamin-d-receptor-deacetylation
#15
Marya S Sabir, Chengcheng Hu, Zainab Khan, Michael A Galligan, Christopher M Dussik, Sanchita Mallick, Angelika Dampf Stone, Shane F Batie, Elizabeth T Jacobs, G Kerr Whitfield, Mark R Haussler, Michael C Heck, Peter W Jurutka
The hormonal metabolite of vitamin D, 1,25-dihydroxyvitamin D3 (1,25D), binds to the vitamin D receptor (VDR) and promotes heterodimerization of VDR with a retinoid-X-receptor (RXR) to genomically regulate diverse cellular processes. Herein, it is revealed for the first time that VDR is post-translationally acetylated, and that VDR immunoprecipitated from human embryonic kidney (HEK293) cells displays a dramatic decrease in acetylated receptor in the presence of 1,25D-ligand, sirtuin-1 (SIRT1) deacetylase, or the resveratrol activator of SIRT1...
June 18, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28636799/transcriptional-mechanisms-coordinating-tight-junction-assembly-during-epithelial-differentiation
#16
REVIEW
Felix J Boivin, Kai M Schmidt-Ott
Epithelial tissues form a selective barrier via direct cell-cell interactions to separate and establish concentration gradients between the different compartments of the body. Proper function and formation of this barrier rely on the establishment of distinct intercellular junction complexes. These complexes include tight junctions, adherens junctions, desmosomes, and gap junctions. The tight junction is by far the most diverse junctional complex in the epithelial barrier. Its composition varies greatly across different epithelial tissues to confer various barrier properties...
June 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28636758/fetal-overnutrition-and-offspring-insulin-resistance-and-%C3%AE-cell-function-the-exploring-perinatal-outcomes-among-children-epoch-study
#17
K A Sauder, C W Hockett, B M Ringham, D H Glueck, D Dabelea
AIMS: To examine the associations of intrauterine exposure to maternal diabetes and obesity with offspring insulin resistance, β-cell function and oral disposition index in a longitudinal observational study of ethnically diverse offspring. METHODS: A total of 445 offspring who were exposed (n=81) or not exposed (n=364) to maternal diabetes in utero completed two fasting blood measurements at mean (sd) ages of 10.5 (1.5) and 16.5 (1.2) years, respectively, and an oral glucose tolerance test at the second visit...
June 21, 2017: Diabetic Medicine: a Journal of the British Diabetic Association
https://www.readbyqxmd.com/read/28636670/identification-of-novel-small-molecules-that-inhibit-stat3-dependent-transcription-and-function
#18
Iryna Kolosenko, Yasmin Yu, Sander Busker, Matheus Dyczynski, Jianping Liu, Martin Haraldsson, Caroline Palm Apergi, Thomas Helleday, Katja Pokrovskaja Tamm, Brent D G Page, Dan Grander
Activation of Signal Transducer and Activator of Transcription 3 (STAT3) has been linked to several processes that are critical for oncogenic transformation, cancer progression, cancer cell proliferation, survival, drug resistance and metastasis. Inhibition of STAT3 signaling has shown a striking ability to inhibit cancer cell growth and therefore, STAT3 has become a promising target for anti-cancer drug development. The aim of this study was to identify novel inhibitors of STAT-dependent gene transcription...
2017: PloS One
https://www.readbyqxmd.com/read/28636597/phase-separation-drives-heterochromatin-domain-formation
#19
Amy R Strom, Alexander V Emelyanov, Mustafa Mir, Dmitry V Fyodorov, Xavier Darzacq, Gary H Karpen
Constitutive heterochromatin is an important component of eukaryotic genomes that has essential roles in nuclear architecture, DNA repair and genome stability, and silencing of transposon and gene expression. Heterochromatin is highly enriched for repetitive sequences, and is defined epigenetically by methylation of histone H3 at lysine 9 and recruitment of its binding partner heterochromatin protein 1 (HP1). A prevalent view of heterochromatic silencing is that these and associated factors lead to chromatin compaction, resulting in steric exclusion of regulatory proteins such as RNA polymerase from the underlying DNA...
June 21, 2017: Nature
https://www.readbyqxmd.com/read/28636486/spirituality-religion-and-suicidality-among-veterans-a-qualitative-study
#20
Jaimie Lusk, Steven K Dobscha, Marek Kopacz, Mary Frances Ritchie, Sarah Ono
OBJECTIVES: This qualitative study explores the relationship between Veterans' spirituality/religion and suicide ideation and attempts. METHODS: Qualitative semi-structured interviews were conducted with 30 Veterans who either endorsed chronic suicidal ideation or had made suicide attempt(s). Interviews explored the bi-directional relationship between spirituality/religion (e.g., beliefs, practices and experiences), and suicide ideation and behaviors. Interviews were analyzed using thematic analysis...
June 21, 2017: Archives of Suicide Research: Official Journal of the International Academy for Suicide Research
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