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https://www.readbyqxmd.com/read/28222489/characterization-of-a-novel-signal-transducer-element-intrinsic-to-class-iiia-b-adenylate-cyclases-and-guanylate-cyclases
#1
Miriam Ziegler, Jens Bassler, Stephanie Beltz, Anita Schultz, Andrei N Lupas, Joachim E Schultz
Adenylate cyclases (ACs) are signalling proteins that produce the second messenger cAMP. Class III ACs comprises four groups (class IIIa-d); of these, class IIIa and IIIb ACs have been identified in bacteria and eukaryotes. Many class IIIa ACs are anchored to membranes via hexahelical domains. In eukaryotic ACs, membrane anchors are well conserved, suggesting that this region possesses important functional characteristics that are as yet unknown. To address this question, we replaced the hexahelical membrane anchor of the mycobacterial AC Rv1625c by the hexahelical quorum-sensing receptor from Legionella, LqsS...
February 21, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28222448/acute-effects-of-viral-exposure-on-p-glyco-protein-function-in-the-mouse-fetal-blood-brain-barrier
#2
Enrrico Bloise, Sophie Petropoulos, Majid Iqbal, Alisa Kostaki, Tania Maria Ortiga-Carvalho, William Gibb, Stephen G Matthews
BACKGROUND/AIMS: Viral infection during pregnancy is known to affect the fetal brain. The toll-like receptor (TLR)-3 is a pattern recognition receptor activated by viruses known to elicit adverse fetal neurological outcomes. The P-glycoprotein (P-gp) efflux transporter protects the developing fetus by limiting the transfer of substrates across both the placenta and the fetal blood-brain barrier (BBB). As such, inhibition of P-gp at these blood-barrier sites may result in increased exposure of the developing fetus to environmental toxins and xenobiotics present in the maternal circulation...
February 22, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28222434/a-feedback-loop-between-mir-30a-c-5p-and-dnmt1-mediates-cisplatin-resistance-in-ovarian-cancer-cells
#3
Xi Han, Shuai Zhen, Zhongxue Ye, Jiaojiao Lu, Lijie Wang, Pan Li, Jie Li, Xia Zheng, Huijin Li, Wei Chen, Le Zhao, Xu Li
BACKGROUND: Many microRNAs (miRs) are dysregulated in cancers, and aberrant miR expression patterns have been suggested to correlate with chemo-resistance of cancer cells. We aim to study the role of miR-30 family members in cisplatin-resistance of ovarian cancer cells. METHODS: qRT-PCR was used to compare differential expression levels of miR-30 family members in ovarian cancer cell line A2780 and its cisplatin-resistant derivative CP70. Changes of cisplatin-sensitivity in miR-30a-5p- and miR-30c-5p-overexpressed-CP70 cells and miR-30a-5p- and miR-30c-5p-inhibited-A2780 cells were examined by CCK8 assay and apoptosis analysis using flow cytometry; targets of miR-30a/c-5p were analyzed by western blotting and luciferase reporter assay; methylation regulation of pre-miR-30a/c-5p was examined by methylation specific PCR...
February 21, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28222426/knockdown-of-pd-l1-in-human-gastric-cancer-cells-inhibits-tumor-progression-and-improves-the-cytotoxic-sensitivity-to-cik-therapy
#4
Jing Li, Lujun Chen, Yuqi Xiong, Xiao Zheng, Quanqin Xie, Qi Zhou, Liangrong Shi, Changping Wu, Jingting Jiang, Haitao Wang
: Background/Abstract: PD-L1 has been an important target of cancer immunotherapy. We have showed that in human gastric cancer tissues, over-expression of PD-L1 was significantly associated with cancer progression and patients' postoperative prognoses. However, as of now, how PD-L1 regulates the biological function of gastric cancer cells still remains elusive. METHODS: We constructed the stable PD-L1 knockdown expression gastric cancer cell lines by using RNAi method, and further investigated the changes of biological functions including cell viability, migration, invasion, cell cycle, apoptosis, tumorigenicity in vivo, and the cytotoxic sensitivity to CIK therapy, in contrast to the control cells...
February 20, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28222392/endor-with-band-selective-shaped-inversion-pulses
#5
Claudia E Tait, Stefan Stoll
Electron Nuclear DOuble Resonance (ENDOR) is based on the measurement of nuclear transition frequencies through detection of changes in the polarization of electron transitions. In Davies ENDOR, the initial polarization is generated by a selective microwave inversion pulse. The rectangular inversion pulses typically used are characterized by a relatively low selectivity, with full inversion achieved only for a limited number of spin packets with small resonance offsets. With the introduction of pulse shaping to EPR, the rectangular inversion pulses can be replaced with shaped pulses with increased selectivity...
February 12, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28222386/heterogeneous-fractionation-profiles-of-meta-analytic-coactivation-networks
#6
Angela R Laird, Michael C Riedel, Mershack Okoe, Radu Jianu, Kimberly L Ray, Simon B Eickhoff, Stephen M Smith, Peter T Fox, Matthew T Sutherland
Computational cognitive neuroimaging approaches can be leveraged to characterize the hierarchical organization of distributed, functionally specialized networks in the human brain. To this end, we performed large-scale mining across the BrainMap database of coordinate-based activation locations from over 10,000 task-based experiments. Meta-analytic coactivation networks were identified by jointly applying independent component analysis (ICA) and meta-analytic connectivity modeling (MACM) across a wide range of model orders (i...
February 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28222382/corporeal-illusions-in-chronic-spinal-cord-injuries
#7
Michele Scandola, Salvatore Maria Aglioti, Renato Avesani, Gianettore Bertagnoni, Anna Marangoni, Valentina Moro
While several studies have investigated corporeal illusions in patients who have suffered from a stroke or undergone an amputation, only anecdotal or single case reports have explored this phenomenon after spinal cord injury. Here we examine various different types of bodily misperceptions in a comparatively large group of 49 people with spinal cord injury in the post-acute and chronic phases after the traumatic lesion onset. An extensive battery of questionnaires concerning a variety of body related feelings was administered and the results were correlated to the main clinical variables...
February 17, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28222371/remediating-1-4-dioxane-contaminated-water-with-slow-release-persulfate-and-zerovalent-iron
#8
Ann Kambhu, Megan Gren, Wei Tang, Steve Comfort, Clifford E Harris
1,4-dioxane is an emerging contaminant that was used as a corrosion inhibitor with chlorinated solvents. Metal-activated persulfate can degrade dioxane but reaction kinetics have typically been characterized by a rapid decrease during the first 30 min followed by either a slower decrease or no further change (i.e., plateau). Our objective was to identify the factors responsible for this plateau and then determine if slow-release formulations of sodium persulfate and Fe(0) could provide a more sustainable degradation treatment...
February 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28222362/quinazolinone-benzimidazole-conjugates-synthesis-characterization-dihydrofolate-reductase-inhibition-dna-and-protein-binding-properties
#9
Prinka Singla, Vijay Luxami, Kamaldeep Paul
Quinazolinone and benzimidazole represent as important and abundant classes of fused nitrogen-containing heterocycle. A series of two isomeric quinazolinone-benzimidazole conjugates is synthesized and substitutes with different aromatic rings. These compounds are well characterized by (1)H and (13)C NMR as well as mass spectrometry. Compounds are then evaluated by dihydrofolate reductase inhibitory activity. In vitro assay shows that some compounds are exhibiting significant dihydrofolate reductase inhibitory activities...
February 14, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28222329/inflammatory-chemokines-and-their-receptors-in-human-visceral-leishmaniasis-gene-expression-profile-in-peripheral-blood-splenic-cellular-sources-and-their-impact-on-trafficking-of-inflammatory-cells
#10
Neetu Singh, Shyam Sundar
Chemokines play an important role in determining cellular composition at inflammatory sites, and as such, influence disease outcome. In this study, we investigated the expression profile and splenic cellular source of various inflammatory chemokines and their receptors in human visceral leishmaniasis (VL). The expression of chemokines or their receptors was measured at the gene and protein level by employing real time qPCR and a cytometric bead array assay, respectively. In addition, the cellular source of chemokines and their receptors in the spleen was identified employing gene expression analyses in sequentially selected cell subsets...
February 18, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28222308/comparative-analysis-of-pd-l1-expression-between-primary-and-metastatic-pulmonary-adenocarcinomas
#11
Sehui Kim, Jaemoon Koh, Dohee Kwon, Bhumsuk Keam, Heounjeong Go, Young A Kim, Yoon Kyung Jeon, Doo Hyun Chung
Programmed death-ligand 1 (PD-L1) expression in pulmonary adenocarcinomas (pADCs) was implicated in predicting anti-PD-1/PD-L1 therapy efficacy. However, the differential expression of PD-L1 between primary and metastatic pADC remains unclear. Thus, we addressed this issue. In total, 161 paired primary and metastatic tumour tissues from 146 patients with pADC were collected. Most of the cases had regional nodal metastasis (134/161, 83.2%). PD-L1 expression was categorised based on the proportion of immunostained tumour cells using cutoff values of 1%, 5%, 10% and 50%...
February 18, 2017: European Journal of Cancer
https://www.readbyqxmd.com/read/28222263/reaction-mechanism-of-covalent-modification-of-phosphatidylethanolamine-lipids-by-reactive-aldehydes-4-hydroxy-2-nonenal-and-4-oxo-2-nonenal
#12
Katarina Vazdar, Danijela Vojta, Davor Margetić, Mario Vazdar
4-hydroxy-2-nonenal (HNE) and 4-oxo-2-nonenal (ONE) are biologically important reactive aldehydes formed during oxidative stress in phospholipid bilayers. They are highly reactive species due to presence of several reaction centers and can react with amino acids in peptides and proteins, as well as phosphoethanolamine (PE) lipids, thus modifying their biological activity. The aim of this work is to study in a molecular detail the reactivity of HNE and ONE towards PE lipids in a simplified system containing only lipids and reactive aldehydes in dichloromethane as an inert solvent...
February 21, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28222235/visual-appearance-of-a-virtual-upper-limb-modulates-the-temperature-of-the-real-hand-a-thermal-imaging-study-in-immersive-virtual-reality
#13
G Tieri, A Gioia, M Scandola, E F Pavone, S M Aglioti
To explore the link between Sense of Embodiment (SoE) over a virtual hand and physiological regulation of skin temperature, twenty-four healthy participants were immersed in virtual reality through a Head Mounted Display and had their real limb temperature recorded by means of a high-sensitivity infrared camera. Participants observed a virtual right upper limb (appearing either normally, or with the hand detached from the forearm) or limb-shaped non-corporeal control objects (continuous or discontinuous wooden blocks) from a first-person perspective...
February 21, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28222217/multi-component-diffusion-characterization-of-radiation-induced-white-matter-damage
#14
Roshan A Karunamuni, Nathan S White, Carrie R McDonald, Michael Connor, Niclas Pettersson, Tyler M Seibert, Joshua Kuperman, Nikdokht Farid, Vitali Moiseenko, Anders M Dale, Jona A Hattangadi-Gluth
PURPOSE: We used multi-b-value diffusion models to characterize microstructural white matter changes after brain radiation into fast and slow components, in order to better understand the pathophysiology of radiation-induced tissue damage. METHODS: Fourteen patients were included in this retrospective analysis with imaging prior to, and at 1, 4-5, and 9-10 months after radiotherapy (RT). Diffusion signal decay within brain white matter was fit to a bi-exponential model to separate changes within the slow and fast components...
February 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/28222214/segregation-and-expression-analyses-of-habp2-insights-from-a-large-series-of-familial-non-medullary-thyroid-cancers-and-literature-review
#15
Carla Colombo, Marina Muzza, Maria Carla Proverbio, Giulia Ercoli, Michela Perrino, Valentina Cirello, Leonardo Vicentini, Stefano Ferrero, Laura Fugazzola
INTRODUCTION: Recently, the G534E variant of the HABP2 gene was reported as the underlying genetic defect in a large kindred with non-syndromic familial non medullary thyroid cancer (FNMTC). Nevertheless, this postulated role was not confirmed in additional cohorts. Contrasting data are also available on HABP2 expression in the thyroid. OBJECTIVES: To investigate HABP2 as a potential susceptibility gene in a large series of 27 unrelated families with FNMTC and to test its expression in thyroid tumor and matched normal tissues...
February 21, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28222197/generalized-min-max-bound-based-mri-pulse-sequence-design-framework-for-wide-range-t1-relaxometry-a-case-study-on-the-tissue-specific-imaging-sequence
#16
Yang Liu, John R Buck, Vasiliki N Ikonomidou
This paper proposes a new design strategy for optimizing MRI pulse sequences for T1 relaxometry. The design strategy optimizes the pulse sequence parameters to minimize the maximum variance of unbiased T1 estimates over a range of T1 values using the Cramér-Rao bound. In contrast to prior sequences optimized for a single nominal T1 value, the optimized sequence using our bound-based strategy achieves improved precision and accuracy for a broad range of T1 estimates within a clinically feasible scan time. The optimization combines the downhill simplex method with a simulated annealing process...
2017: PloS One
https://www.readbyqxmd.com/read/28222125/streptococcus-sanguinis-induces-neutrophil-cell-death-by-production-of-hydrogen-peroxide
#17
Ryuichi Sumioka, Masanobu Nakata, Nobuo Okahashi, Yixuan Li, Satoshi Wada, Masaya Yamaguchi, Tomoko Sumitomo, Mikako Hayashi, Shigetada Kawabata
Streptococcus is the dominant bacterial genus in the human oral cavity and a leading cause of infective endocarditis. Streptococcus sanguinis belongs to the mitis group of streptococci and produces hydrogen peroxide (H2O2) by the action of SpxB, a pyruvate oxidase. In this study, we investigated the involvement of SpxB in survival of S. sanguinis in human blood and whether bacterial H2O2 exhibits cytotoxicity against human neutrophils. Results of a bactericidal test with human whole blood revealed that the spxB mutation in S...
2017: PloS One
https://www.readbyqxmd.com/read/28222122/poor-replication-validity-of-biomedical-association-studies-reported-by-newspapers
#18
Estelle Dumas-Mallet, Andy Smith, Thomas Boraud, François Gonon
OBJECTIVE: To investigate the replication validity of biomedical association studies covered by newspapers. METHODS: We used a database of 4723 primary studies included in 306 meta-analysis articles. These studies associated a risk factor with a disease in three biomedical domains, psychiatry, neurology and four somatic diseases. They were classified into a lifestyle category (e.g. smoking) and a non-lifestyle category (e.g. genetic risk). Using the database Dow Jones Factiva, we investigated the newspaper coverage of each study...
2017: PloS One
https://www.readbyqxmd.com/read/28222027/vitamin-d-modulates-the-expression-of-hla-dr-and-cd38-after-in-vitro-activation-of-t-cells
#19
Simon Villegas-Ospina, Wbeimar Aguilar-Jimenez, Sandra M Gonzalez, María T Rugeles
OBJECTIVE: Vitamin D (VitD) is an anti-inflammatory hormone; however, some evidence shows that VitD may induce the expression of activation markers, such as CD38 and HLA-DR. We explored its effect on the expression of these markers on CD4+ and CD8+ T-cells in vitro, and their potential correlations in vivo. MATERIALS AND METHODS: CD38 and HLA-DR expression was measured by flow cytometry in PHA/IL-2-activated mononuclear cells cultured under VitD precursors: three cholecalciferol (10-11M, 10-9M, 10-7M; n=11) and two calcidiol (40 ng/mL, 80 ng/mL; n=9) concentrations...
February 21, 2017: Hormone Molecular Biology and Clinical Investigation
https://www.readbyqxmd.com/read/28221994/video-saliency-detection-via-spatial-temporal-fusion-and-low-rank-coherency-diffusion
#20
Chenglizhao Chen, Shuai Li, Yongguang Wang, Hong Qin, Aimin Hao
This paper advocates a novel video saliency detection method based on the spatial-temporal saliency fusion and low-rank coherency guided saliency diffusion. In sharp contrast to the conventional methods, which conduct saliency detection locally in a frame-by-frame way and could easily give rise to incorrect low-level saliency map, in order to overcome the existing difficulties, this paper proposes to fuse the color saliency based on global motion clues in a batch-wise fashion. And we also propose low-rank coherency guided spatial-temporal saliency diffusion to guarantee the temporal smoothness of saliency maps...
February 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
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