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https://www.readbyqxmd.com/read/28445928/regulation-of-angiogenic-behaviors-by-oxytocin-receptor-through-gli1-indcued-transcription-of-hif-1%C3%AE-in-human-umbilical-vein-endothelial-cells
#1
Ji Zhu, Huiyan Wang, Xiaoyan Zhang, Yin Xie
Angiogenesis is a dynamic hypoxia-stimulated process playing a key role in tissue growth and repair under various pathophysiological circumstances. Abnormal angiogenesis contributes to the pathogenesis of many human diseases. Oxytocin receptor is a classical G-protein-coupled receptor expressed on endothelial cells. The present study was aimed to investigate how oxytocin receptor regulated the angiogenic behaviors of human umbilical vein endothelial cells (HUVECs). We found that oxytocin at 0.1μM significantly increased cell proliferation, upregulated the mRNA and protein expression of CD31 and vWF (two important endothelial markers), and enhanced the tuber formation capacity in HUVECs...
April 22, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28445881/absence-of-decline-of-kidney-function-in-human-immunodeficiency-virus-infected-patients-under-routine-clinical-management
#2
Julie Boucquemont, Sylvie Lawson-Ayayi, Claire Rigothier, Fabrice Bonnet, Cécile Proust-Lima, Didier Neau, Carine Greib, Ghada Miremont-Salamé, François Dabis, Michel Dupon, Frédéric-Antoine Dauchy
BACKGROUND: Since the introduction of antiretroviral therapy (ART), human immunodeficiency virus (HIV)-infected patients have a drastically improved prognosis but at the same time they are also more affected by non-HIV related complications, such as chronic kidney disease. The objective of our study was to investigate the effect of proteinuria and tenofovir (TDF)-containing ART regimens on the temporal evolution of estimated glomerular filtration rate (eGFR). METHODS: Between April 2008 and October 2012, we enrolled 395 patients with a complete renal evaluation among patients from the ANRS C03 Aquitaine cohort, a prospective hospital-based cohort of HIV-1-infected patients under routine clinical management in southwestern France...
April 26, 2017: Nephron
https://www.readbyqxmd.com/read/28445832/study-of-the-mechanism-of-protonated-histidine-induced-conformational-changes-in-the-zika-virus-dimeric-envelope-protein-using-accelerated-molecular-dynamic-simulations
#3
Jixue Sun, Yang Li, Pi Liu, Jianping Lin
The Zika virus has drawn worldwide attention because of the epidemic diseases it causes. It is a flavivirus that has an icosahedral protein shell constituted by an envelope glycoprotein (E-protein) and membrane protein (M-protein) in the mature virion. The multistep process of membrane fusion to infect the host cell is pH-induced. To understand the mechanism of the conformational changes in the (E-M)2 protein homodimer embedded in the membrane, two 200-ns accelerated dynamic simulations were performed under different pH conditions...
April 13, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28445813/microfluidic-integrated-patterned-ito-immunosensor-for-rapid-detection-of-prostate-specific-membrane-antigen-biomarker-in-prostate-cancer
#4
Rajesh Seenivasan, Chandra K Singh, Jay W Warrick, Nihal Ahmad, Sundaram Gunasekaran
An optically transparent patterned indium tin oxide (ITO) three-electrode sensor integrated with a microfluidic channel was designed for label-free immunosensing of prostate-specific membrane antigen (PSMA), a prostate cancer (PCa) biomarker, expressed on prostate tissue and circulating tumor cells but also found in serum. The sensor relies on cysteamine capped gold nanoparticles (N-AuNPs) covalently linked with anti-PSMA antibody (Ab) for target specificity. A polydimethylsiloxane (PDMS) microfluidic channel is used to efficiently and reproducibly introduce sample containing soluble proteins/cells to the sensor...
April 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28445761/live-cell-super-resolution-reveals-f-actin-and-plasma-membrane-dynamics-at-the-t-cell-synapse
#5
George W Ashdown, Garth L Burn, David J Williamson, Elvis Pandžić, Ruby Peters, Michael Holden, Helge Ewers, Lin Shao, Paul W Wiseman, Dylan M Owen
The cortical actin cytoskeleton has been shown to be critical for the reorganization and heterogeneity of plasma membrane components of many cells, including T cells. Building on previous studies at the T cell immunological synapse, we quantitatively assess the structure and dynamics of this meshwork using live-cell superresolution fluorescence microscopy and spatio-temporal image correlation spectroscopy. We show for the first time, to our knowledge, that not only does the dense actin cortex flow in a retrograde fashion toward the synapse center, but the plasma membrane itself shows similar behavior...
April 25, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28445750/effect-of-phosphorylation-on-a-human-like-osteopontin-peptide
#6
Samuel Lenton, Marco Grimaldo, Felix Roosen-Runge, Frank Schreiber, Tommy Nylander, Roger Clegg, Carl Holt, Michael Härtlein, Victoria García Sakai, Tilo Seydel, Susana C Marujo Teixeira
The last decade established that the dynamic properties of the phosphoproteome are central to function and its modulation. The temporal dimension of phosphorylation effects remains nonetheless poorly understood, particularly for intrinsically disordered proteins. Osteopontin, selected for this study due to its key role in biomineralization, is expressed in many species and tissues to play a range of distinct roles. A notable property of highly phosphorylated isoforms of osteopontin is their ability to sequester nanoclusters of calcium phosphate to form a core-shell structure, in a fluid that is supersaturated but stable...
April 25, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28445746/crosstalk-and-the-dynamical-modularity-of%C3%A2-feed-forward-loops-in-transcriptional-regulatory-networks
#7
Michael A Rowland, Ahmed Abdelzaher, Preetam Ghosh, Michael L Mayo
Network motifs, such as the feed-forward loop (FFL), introduce a range of complex behaviors to transcriptional regulatory networks, yet such properties are typically determined from their isolated study. We characterize the effects of crosstalk on FFL dynamics by modeling the cross regulation between two different FFLs and evaluate the extent to which these patterns occur in vivo. Analytical modeling suggests that crosstalk should overwhelmingly affect individual protein-expression dynamics. Counter to this expectation we find that entire FFLs are more likely than expected to resist the effects of crosstalk (≈20% for one crosstalk interaction) and remain dynamically modular...
April 25, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28445488/a-versatile-method-for-dynamically-controlled-patterning-of-small-populations-of-epithelial-cells-on-substrates-via-non-contact-piezoelectric-inkjet-printing
#8
Kristen B Lee, Laimonas Kelbauskas, Alan Brunner, Deirdre R Meldrum
Intercellular interactions play a central role at the tissue and whole organism level modulating key cellular functions in normal and disease states. Studies of cell-cell communications are challenging due to ensemble averaging effects brought about by intrinsic heterogeneity in cellular function which requires such studies to be conducted with small populations of cells. Most of the current methods for producing and studying such small cell populations are complex to implement and require skilled personnel limiting their widespread utility in biomedical research labs...
2017: PloS One
https://www.readbyqxmd.com/read/28445428/residue-modification-and-mass-spectrometry-for-the-investigation-of-structural-and-metalation-properties-of-metallothionein-and-cysteine-rich-proteins
#9
REVIEW
Gordon W Irvine, Martin J Stillman
Structural information regarding metallothioneins (MTs) has been hard to come by due to its highly dynamic nature in the absence of metal-thiolate cluster formation and crystallization difficulties. Thus, typical spectroscopic methods for structural determination are limited in their usefulness when applied to MTs. Mass spectrometric methods have revolutionized our understanding of protein dynamics, structure, and folding. Recently, advances have been made in residue modification mass spectrometry in order to probe the hard-to-characterize structure of apo- and partially metalated MTs...
April 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28445157/lim-kinases-cofilin-and-beyond
#10
Chloé Prunier, Renaud Prudent, Reuben Kapur, Karin Sadoul, Laurence Lafanechère
LIM kinases are common downstream effectors of several signalization pathways and function as a signaling node that controls cytoskeleton dynamics through the phosphorylation of the cofilin family proteins. These last 10 years, several reports indicate that the functions of LIM kinases are more extended than initially described and, specifically, that LIM kinases also control microtubule dynamics, independently of their regulation of actin microfilament. In this review we analyze the data supporting these conclusions and the possible mechanisms that could be involved in the control of microtubules by LIM kinases...
April 9, 2017: Oncotarget
https://www.readbyqxmd.com/read/28445123/changes-in-the-free-energy-landscape-of-p38%C3%AE-map-kinase-through-its-canonical-activation-and-binding-events-as-studied-by-enhanced-molecular-dynamics-simulations
#11
Antonija Kuzmanic, Ludovico Sutto, Giorgio Saladino, Angel R Nebreda, Francesco L Gervasio, Modesto Orozco
p38α is a Ser/Thr protein kinase involved in a variety of cellular processes and pathological conditions, which makes it a promising pharmacological target. Although the activity of the enzyme is highly regulated, its molecular mechanism of activation remains largely unexplained, even after decades of research. By using state-of-the-art molecular dynamics simulations, we decipher the key elements of the complex molecular mechanism refined by evolution to allow for a fine tuning of p38α kinase activity. Our study describes for the first time the molecular effects of different regulators of the enzymatic activity, and provides an integrative picture of the activation mechanism that explains the seemingly contradictory X-ray and NMR data...
April 26, 2017: ELife
https://www.readbyqxmd.com/read/28445093/dynamics-of-cytokine-like-activity-in-the-hyperplasic-ovary-of-ex-fissiparous-planarians
#12
Abdel Halim Harrath, Abdelhabib Semlali, Lamjed Mansour, Waleed Aldahmash, Suliman Y Al Omar, Mohamed S Al Anazi, Jens R Nyengaard, Saleh Alwasel
The origin of infertility in the hyperplasic ovary of ex-fissiparous planarians remains poorly understood. In a previous study we demonstrated that a complex process of early autophagy, followed by apoptotic processes, occurs in the hyperplasic ovary of the freshwater planarian Dugesia arabica. The present study aimed to investigate whether the mRNA expression levels of selected mRNA-like genes are altered in the hyperplasic ovary of the ex-fissiparous freshwater planarian D. arabica compared to the normal ovary...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28445027/structurally-linked-dynamics-in-lactate-dehydrogenases-of-evolutionarily-distinct-species
#13
Matthew J Varga, Michael W Dzierlenga, Steven D Schwartz
We present new findings on how primary and secondary structure affects the role of fast protein motions in the reaction coordinates of enzymatic reactions. Using transition path sam- pling (TPS) and committor distribution analysis, we examined the difference in the role of these fast protein motions in the reaction coordinate of lactate dehydrogenases (LDH) of Api- complexa organisms Plasmodium falciparum and Cryptosporidium parvum. Having evolved separately from a common malate dehydrogenase ancestor, there are several important struc- tural differences between the two enzymes, notably a five amino acid insertion into the active site loop of P...
April 26, 2017: Biochemistry
https://www.readbyqxmd.com/read/28444908/micelles-of-the-chiral-biocompatible-surfactant-1r-2s-dodecyl-2-hydroxy-1-methyl-2-phenylethyl-dimethylammonium-bromide-dmeb-molecular-dynamics-and-fragmentation-patterns-in-gas-phase
#14
David Bongiorno, Serena Indelicato, Leopoldo Ceraulo, Ugo Perricone, Valentina Calabrese, Anna Maria Almerico, Vincenzo Turco Liveri, Marco Tutone
RATIONALE: The study of self-assembly process of surfactant molecules in gas phase is of actually interest for several theoretical and technological reasons related to their possible exploitation as drug carriers, protein shields and cleaning agents in gas phase. METHODS: Stability and fragmentation patterns of singly and multiply charged (either positively or negatively) aggregates of the surfactant (1R,2S)-dodecyl(2-hydroxy-1-methyl-2-phenylethyl) dimethyl ammonium bromide (DMEB) in gas phase have been studied by ion mobility mass spectrometry and tandem mass spectrometry...
April 26, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28444861/lncrna-malat1-is-dysregulated-in-diabetic-nephropathy-and-involved-in-high-glucose-induced-podocyte-injury-via-its-interplay-with-%C3%AE-catenin
#15
Mengsi Hu, Rong Wang, Xiaobing Li, Minghua Fan, Jiangong Lin, Junhui Zhen, Liqun Chen, Zhimei Lv
Metastasis associated lung adenocarcinoma transcript 1(MALAT1) is a long non-coding RNA, broadly expressed in mammalian tissues including kidney and up-regulated in a variety of cancer cells. To date, its functions in podocytes are largely unknown. β-catenin is a key mediator in the canonical and non-canonical Wnt signalling pathway; its aberrant expression promotes podocyte malfunction and albuminuria, and contributes to kidney fibrosis. In this study, we found that MALAT1 levels were increased in kidney cortices from C57BL/6 mice with streptozocin (STZ)-induced diabetic nephropathy, and dynamically regulated in cultured mouse podocytes stimulated with high glucose, which showed a trend from rise to decline...
April 26, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28444399/development-of-a-multipurpose-scaffold-for-the-display-of-peptide-loops
#16
Maxim Rossmann, Sandra J Greive, Tommaso Moschetti, Michael Dinan, Marko Hyvönen
Protein-protein interactions (PPIs) determine a wide range of biological processes and analysis of these dynamic networks is increasingly becoming a mandatory tool for studying protein function. Using the globular ATPase domain of recombinase RadA as a scaffold, we have developed a peptide display system (RAD display), which allows for the presentation of target peptides, protein domains or full-length proteins and their rapid recombinant production in bacteria. The design of the RAD display system includes differently tagged versions of the scaffold, which allows for flexibility in the protein purification method, and chemical coupling for small molecule labeling or surface immobilization...
April 24, 2017: Protein Engineering, Design & Selection: PEDS
https://www.readbyqxmd.com/read/28444340/ligpargen-web-server-an-automatic-opls-aa-parameter-generator-for-organic-ligands
#17
Leela S Dodda, Israel Cabeza de Vaca, Julian Tirado-Rives, William L Jorgensen
The accurate calculation of protein/nucleic acid-ligand interactions or condensed phase properties by force field-based methods require a precise description of the energetics of intermolecular interactions. Despite the progress made in force fields, small molecule parameterization remains an open problem due to the magnitude of the chemical space; the most critical issue is the estimation of a balanced set of atomic charges with the ability to reproduce experimental properties. The LigParGen web server provides an intuitive interface for generating OPLS-AA/1...
April 21, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28443989/diagnostic-and-prognostic-value-of-procalcitonin-for-early-intracranial-infection-after-craniotomy
#18
Y Yu, H J Li
Intracranial infection is a common clinical complication after craniotomy. We aimed to explore the diagnostic and prognostic value of dynamic changing procalcitonin (PCT) in early intracranial infection after craniotomy. A prospective study was performed on 93 patients suspected of intracranial infection after craniotomy. Routine peripheral venous blood was collected on the day of admission, and C reactive protein (CRP) and PCT levels were measured. Cerebrospinal fluid (CSF) was collected for routine biochemical, PCT and culture assessment...
April 20, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28443664/theory-and-electrochemistry-of-cytochrome-c
#19
Salman S Seyedi, Morteza M M Waskasi, Dmitry V Matyushov
Extensive simulations of cytochrome c in solution are performed to address the apparent contradiction between large reorganization energies of protein electron transfer typically reported by atomistic simulations and much smaller values produced by protein electrochemistry. The two sets of data are reconciled by deriving the activation barrier for electrochemical reaction in terms of an effective reorganization energy composed of half the Stokes shift (characterizing the medium polarization in response to electron transfer) and the variance reorganization energy (characterizing the breadth of electrostatic fluctuations)...
April 26, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28443516/synergistic-effect-of-graphene-oxide-coated-nanotised-apigenin-with-paclitaxel-go-na-ptx-a-ros-dependent-mitochondrial-mediated-apoptosis-in-ovarian-cancer
#20
Manish Kumar Pal, Shyam Pyari Jaiswar, Ashish Dwivedi, Shruti Goyal, Vinay Nand Dwivedi, Anumesh Kumar Pathak, Vinod Kumar, Pushp Lata Sankhwar, Ratan Singh Ray
Ovarian cancer is most lethal among all gynecologic malignancies. Paclitaxel (PTX) is well used chemotherapeutic regimen for cancer control; however its undesired toxicity has been always a matter of concern for clinicians. Here we used the graphene oxide coated nanotised apigenin (GO-NA) as chemo sensitizing agent to enhance the efficacy of paclitaxel to overcome the limitations of chemotherapy. GO and GO-Apigenin was prepared by modified Hummers method and the nanoparticles were characterized by dynamic light scattering and transmission electron microscopy Human ovarian adenocarcinomas (SKOV-3) cells was treated by DMSO, Group I (Control)-McCoy's 5A Medium, Group II-Paclitaxel (5nM) alone, Group III- Nanotised Apigenin (GO-NA-10μM) Group IV- Paclitaxel (5nM) + GO-NA (10μM)...
April 24, 2017: Anti-cancer Agents in Medicinal Chemistry
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