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Protein phosphatase

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https://www.readbyqxmd.com/read/28735384/influence-of-feeding-inorganic-vanadium-on-growth-performance-endocrine-variables-and-biomarkers-of-bone-health-in-crossbred-calves
#1
Ravi Prakash Pal, Veena Mani, Deepika Tripathi, Rajesh Kumar, Neelam J Kewalramani
The nutritional essentialities of transition element vanadium (V) as micro-nutrient in farm animals have not yet been established, though in rat model, vanadium as vanadate has been reported to exert insulin-mimetic effect and shown to be needed for proper development of bones. The objective of this study was to determine the effect of V supplementation on growth performance, plasma hormones and bone health status in calves. Twenty-four crossbred calves (body weight 72.83 ± 2.5 kg; age 3-9 months) were blocked in four groups and randomly assigned to four treatment groups (n = 6) on body weight and age basis...
July 22, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28731210/ecological-guild-and-enzyme-activities-of-rhizosphere-soil-microbial-communities-associated-with-bt-maize-cultivation-under-field-conditions-in-north-west-province-of-south-africa
#2
Deidré A B van Wyk, Rasheed Adeleke, Owen H J Rhode, Carlos C Bezuidenhout, Charlotte Mienie
Insecticidal proteins expressed by genetically modified Bt maize may alter the enzymatic and microbial communities associated with rhizosphere soil. This study investigated the structure and enzymatic activity of rhizosphere soil microbial communities associated with field grown Bt and non-Bt maize. Rhizosphere soil samples were collected from Bt and non-Bt fields under dryland and irrigated conditions. Samples were subjected to chemical tests, enzyme analyses, and next generation sequencing. Results showed that nitrate and phosphorus concentrations were significantly higher in non-Bt maize dryland soils, while organic carbon was significantly higher in non-Bt maize irrigated field soil...
July 21, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28731168/osteoclast-regulation-of-osteoblasts-via-rank%C3%A2-rankl-reverse-signal-transduction-in%C3%A2-vitro
#3
Shiqian Zhang, Xiaoyu Wang, Guojun Li, Yang Chong, Jie Zhang, Xinzhen Guo, Baoxin Li, Zhenggang Bi
The treatment of osteoporosis typically inhibits the activity of osteoclasts, which subsequently results in the suppression of bone formation and maintenance, however the underlying mechanism remains to be elucidated. The receptor activator of nuclear factor κ‑B ligand (RANKL)‑receptor activator of nuclear factor κ‑B (RANK) signaling axis is important in the osteoblast regulation of osteoclasts. RANKL surface‑bound molecules expressed on T cells stimulate a reverse signaling transduction in order to regulate the T cells, therefore the present study hypothesized that RANKL expressed on osteoblasts may transfer reverse signals to regulate osteoblasts...
July 20, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28731130/effects-of-reduced-%C3%AE-2-glycoprotein-i-on-high-glucose%C3%A2-induced-cell-death-in-huvecs
#4
Jing-Yun Zhang, Jun Ma, Pei Yu, Guang-Jie Tang, Chun-Jun Li, De-Min Yu, Qiu-Mei Zhang
Reduced β2 glycoprotein I (β2GPI) has been demonstrated to exhibit a beneficial effect in diabetic atherosclerosis and retinal neovascularization. However, the effect of reduced β2GPI on vascular disorders in diabetic mellitus (DM) remains to be elucidated. The present study established a high glucose‑induced injury model using human umbilical cords veins (HUVECs) and evaluated the protective effects of reduced β2GPI against the injury. The data demonstrated that a low concentration of reduced β2GPI (0...
July 21, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28730764/mtor-deregulation-in-oral-cavity-squamous-cell-carcinoma
#5
Nicholas S Mastronikolis, Evangelos Tsiambas, Theodoros A Papadas, Panagiotis P Fotiades, Athanasios T Papadas, Stylianos N Mastronikolis, Ioannis Kastanioudakis, Vasileios Ragos
Signal transduction pathways consist of a variety of inter- and intra-cellular molecules. They act as supporting mechanisms for cell survival and homeostasis. Among them, the phosphatidylinositol 3-kinase (PI3K)/tumor suppressor phosphatase and tensin homologue deleted on chromosome ten (PTEN)/protein kinase B (Akt)/mammalian target of rapamycin (mTOR) pathway plays a crucial role in regulating normal cell growth based on growth factor receptors (GFRs) interaction, including epidermal GFR (type II-HER2) and insulin GFR (IGF)...
May 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/28730491/development-of-selected-reaction-monitoring-methods-to-systematically-quantify-kinase-abundance-and-phosphorylation-stoichiometry-in-human-samples
#6
Kirsten Beck, Nathan Camp, Michael Bereman, James Bollinger, Jarrett Egertson, Michael MacCoss, Alejandro Wolf-Yadlin
Protein phosphorylation, one of the most common types of post-translational modifications, is the central regulatory mechanism of cellular signaling networks. In human cells, thousands of proteins are continuously and dynamically phosphorylated and dephosphorylated at specific sites and times in response to external and internal stimuli. Reversible phosphorylation is facilitated by the action of two protein superfamilies: kinases and phosphatases. Kinases play an essential role in almost every relevant physiological process in human cells and their deregulation is linked to pathologies ranging from cancer to autoimmune diseases...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28730488/absolute-phosphorylation-stoichiometry-analysis-by-motif-targeting-quantitative-mass-spectrometry
#7
Chia-Feng Tsai, Wei-Chi Ku, Yu-Ju Chen, Yasushi Ishihama
Direct measurement of site-specific phosphorylation stoichiometry can unambiguously distinguish whether the degree of phosphorylation is regulated by upstream kinase/phosphatase activity or by transcriptional regulation to alter protein expression level. Here, we describe a motif-targeting quantitative proteomic approach that integrates dephosphorylation, isotope tag labeling, and enzymatic kinase reaction for large-scale phosphorylation stoichiometry measurement of the human proteome.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28730486/phosphoproteomic-analysis-of-isolated-mitochondria-in-yeast
#8
Margaux Renvoisé, Ludovic Bonhomme, Marlène Davanture, Michel Zivy, Claire Lemaire
Mitochondria play a central role in cellular energy metabolism and cell death. Deregulation of mitochondrial functions is associated with several human pathologies (neurodegenerative diseases, neuromuscular diseases, type II diabetes, obesity, cancer). The steadily increasing number of identified mitochondrial phosphoproteins, kinases, and phosphatases in recent years suggests that reversible protein phosphorylation plays an important part in the control of mitochondrial processes. In addition, many mitochondrial phosphoproteins probably still remain to be identified, considering that 30% of proteins are expected to be phosphorylated in eukaryotes...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28730483/characterization-of-the-phospho-adhesome-by-mass-spectrometry-based-proteomics
#9
Joseph Robertson, Jonathan D Humphries, Nikki R Paul, Stacey Warwood, David Knight, Adam Byron, Martin J Humphries
Integrin adhesion receptors engage with their extracellular matrix (ECM) ligands, initiating intracellular signaling pathways that regulate a range of fundamental cell functions. Protein kinases and phosphatases play an integral role in integrin adhesion-mediated signaling. However, until recently, knowledge of the phosphorylation sites regulated downstream of integrin ligation was limited to candidate-based approaches and did not support a system-level understanding of the molecular mechanisms through which ECM engagement influences cell behavior...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28729690/functional-variation-of-shp-2-promoter-is-associated-with-preterm-birth-and-delayed-myelination-and-motor-development-in-preterm-infants
#10
So-Yeon Shim, Hye Jin Jeong, Hyo Jin Park, Eun Young Kwon, Bo Min Kim, Yang Ji Choi, Youn-Hee Choi, Su Jin Cho, Ji Ha Choi, Eun Ae Park
Src homology 2 domain-containing protein tyrosine phosphatase 2 (SHP-2) is a cytoplasmic tyrosine phosphatase that is highly expressed in hematopoietic cells and in the CNS and exerts opposite effects on signal transduction by exerting a neuroprotective or proapoptotic effect. Several mutations of SHP-2 have been found in children with myeloproliferative disorders or malignant leukemia, and some of these can affect brain development. In the present study, we aimed to identify and functionally characterize genetic variations in SHP-2 in 72 preterm and 58 full-term infants and to evaluate the effect of the variations on neurodevelopment in preterm infants...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728847/a-novel-role-for-bone-derived-cells-in-ankylosing-spondylitis-focus-on-il-23
#11
Sungsin Jo, Bon San Koo, Bitnara Lee, Eunji Kwon, Young Lim Lee, Heekyoung Chung, Il-Hoon Sung, Ye-Soo Park, Tae-Hwan Kim
The main aim of this study are to explore the role of bone-derived cells (BdCs) in ankylosing spondylitis (AS) and determine the underlying molecular mechanisms of IL-23 production. Primary BdCs were isolated from diced bone of facet joints obtained during surgery from seven AS patients and seven disease control (Ct) patients. Osteoblastic activity of BdCs was assessed by measuring their alkaline phosphatase activity and by alizarin red staining. Osteoblast and endoplasmic reticulum (ER) stress-related genes were assessed by quantitative PCR, immunoblotting, immunofluorescence, and immunohistochemistry...
July 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28728837/epileptic-apnea-in-a-patient-with-inherited-glycosylphosphatidylinositol-anchor-deficiency-and-pigt-mutations
#12
Kosuke Kohashi, Akihiko Ishiyama, Shota Yuasa, Tomomi Tanaka, Kazushi Miya, Yuichi Adachi, Noriko Sato, Hirotomo Saitsu, Chihiro Ohba, Naomichi Matsumoto, Yoshiko Murakami, Taroh Kinoshita, Kenji Sugai, Masayuki Sasaki
We report an 11-month-old boy with acetazolamide-responsive epileptic apnea and inherited glycosylphosphatidylinositol (GPI)-anchor deficiency who presented with decreased serum alkaline phosphatase associated with compound PIGT mutations. The patient exhibited congenital anomalies, severe intellectual disability, and seizures, including epileptic apnea with epileptiform discharges from bilateral temporal areas. Brain magnetic resonance imaging revealed delayed myelination and progressive atrophy of the brainstem, cerebellum, and cerebrum...
July 17, 2017: Brain & Development
https://www.readbyqxmd.com/read/28728679/recent-advances-in-understanding-the-role-of-protein-tyrosine-phosphatases-in-development-and-disease
#13
REVIEW
Alexander J Hale, Eline Ter Steege, Jeroen den Hertog
Protein-tyrosine phosphatases (PTPs) remove phosphate groups from tyrosine residues, and thereby propagate or inhibit signal transduction, and hence influence cellular processes such as cell proliferation and differentiation. The importance of tightly controlled PTP activity is reflected by the numerous mechanisms employed by the cell to control PTP activity, including a variety of post-translational modifications, and restricted subcellular localization. This review highlights the strides made in the last decade and discusses the important role of PTPs in key aspects of embryonic development: the regulation of stem cell self-renewal and differentiation, gastrulation and somitogenesis during early embryonic development, osteogenesis, and angiogenesis...
August 15, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28727654/growth-and-nutritional-biomarkers-of-preterm-infants-fed-a-new-powdered-human-milk-fortifier-a-randomized-trial
#14
Jacques Rigo, Jean-Michel Hascoët, Claude Billeaud, Jean-Charles Picaud, Fabio Mosca, Amandine Rubio, Elie Saliba, Michaël Radkë, Umberto Simeoni, Bernard Guillois, Virginie de Halleux, Jonathan Jaeger, Laurent Ameye, Nicholas P Hays, Johannes Spalinger
OBJECTIVES: Assess growth and nutritional biomarkers of preterm infants fed human milk (HM) supplemented with a new powdered HM fortifier (nHMF) or a control HM fortifier (cHMF). The nHMF provides similar energy content, 16% more protein (partially hydrolyzed whey), and higher micronutrient levels than the cHMF, along with medium-chain triglycerides and docosahexaenoic acid. METHODS: In this controlled, multicenter, double-blind study, a sample of preterm infants ≤32 weeks or ≤1500 g were randomized to receive nHMF (n = 77) or cHMF (n = 76) for a minimum of 21 days...
July 19, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28727495/localization-of-pp2a-b56-to-centromeres-in-drosophila
#15
Emil Peter Thrane Hertz, Jakob Nilsson
Protection of chromosome cohesion through Shugoshin-dependent recruitment of the PP2A-B56 phosphatase to the pericentromeric region has become a cornerstone of the chromosome segregation model in eukaryotes. Shugoshin is essential for meiotic chromosome segregation in all tested eukaryotes but only found to be essential for mitotic chromosome segregation in vertebrates. Nishiyama and colleagues have now found that the protein Dalmatian, an ortholog of the vertebrate cohesion regulator Sororin, performs the function of Shugoshin in Drosophila melanogaster by recruiting PP2A-B56 to the pericentromeric region supporting an unified model of mitotic chromosome segregation in the animal kingdom...
July 19, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28727149/aortic-microcalcification-associates-with-elastin-fragmentation-in-marfan-syndrome
#16
Shaynah A Wanga, Stijntje Hibender, Yanto Ridwan, Cindy van Roomen, Mariska Vos, Ingeborg van der Made, Nicole van Vliet, Romy Franken, Luigi Amjg van Riel, Maarten Groenink, Aeilko H Zwinderman, Barbara Jm Mulder, Carlie Jm de Vries, Jeroen Essers, Vivian de Waard
Marfan syndrome (MFS) is a connective tissue disorder, in which aortic rupture is the major cause of death. MFS patients with an aortic diameter below the advised limit for prophylactic surgery (<5cm) may unexpectedly experience an aortic dissection or rupture, despite yearly monitoring. Hence, there is a clear need for improved prognostic markers to predict such aortic events. We hypothesize that elastin fragments play a causal role in aortic calcification in MFS and that microcalcification serves as a marker for aortic disease severity...
July 20, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28727112/effect-of-in-ovo-feeding-of-l-arginine-on-the-hatchability-growth-performance-gastrointestinal-hormones-and-jejunal-digestive-and-absorptive-capacity-of-posthatch-broilers
#17
T Gao, M Zhao, L Zhang, J Li, L Yu, P Lv, F Gao, G Zhou
This study was conducted to investigate the effects of in ovo feeding (IOF) of Arg solution on the hatchability, growth performance, gastrointestinal hormones, serum AA, activities of digestive enzymes, and mRNA expressions of sensing receptors and nutrient transporters in the jejunum of posthatch broilers. One thousand two hundred embryonated eggs with similar weight were randomly allocated to 5 groups consisting of 8 replicates of 40 eggs each. The 5 treatments were arranged as a noninjected control, a diluent-injected (0...
July 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28726876/bioceramic-nanocomposite-thiol-acrylate-polyhipe-scaffolds-for-enhanced-osteoblastic-cell-culture-in-3d
#18
Aaron Lee, Caitlin R Langford, Luis M Rodriguez-Lorenzo, Helmut Thissen, Neil R Cameron
Emulsion-templated (polyHIPE) scaffolds for bone tissue engineering were produced by photopolymerisation of a mixture of trimethylolpropane tris(3-mercaptopropionate) and dipentaerythritol penta-/hexa-acrylate in the presence of hydroxyapatite (HA) or strontium-modified hydroxyapatite (SrHA) nanoparticles. Porous and permeable polyHIPE materials were produced regardless of the type or incorporation level of the bioceramic, although higher loadings resulted in a larger average pore diameter. Inclusion of HA and SrHA into the scaffolds was confirmed by EDX-SEM, FTIR and XPS and quantified by thermogravimetry...
July 20, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28726759/high-resolution-inhibition-profiling-combined-with-hplc-hrms-spe-nmr-for-identification-of-ptp1b-inhibitors-from-vietnamese-plants
#19
Binh Thi Dieu Trinh, Anna K Jäger, Dan Staerk
Protein tyrosine phosphatase 1B (PTP1B) plays a key role as a negative regulator in insulin signal transduction by deactivating the insulin receptor. Thus, PTP1B inhibition has emerged as a potential therapeutic strategy for curing insulin resistance. In this study, 40 extracts from 18 different plant species were investigated for PTP1B inhibitory activity in vitro. The most promising one, the EtOAc extract of Ficus racemosa, was investigated by high-resolution PTP1B inhibition profiling combined with HPLC-HRMS-SPE-NMR analysis...
July 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28726316/deprotonation-states-of-the-two-active-site-water-molecules-regulate-the-binding-of-protein-phosphatase-5-with-its-substrate-a-molecular-dynamics-study
#20
Lingyun Wang, Feng Yan
Protein phosphatase 5 (PP5), mainly localized in human brain, can dephosphorylate tau protein whose high level of phosphorylation is related to Alzheimer's disease. Similar to other protein phosphatases, PP5 has a conserved motif in the catalytic domain that contains two binding sites for manganese (Mn(2+) ) ions. Structural data indicate that two active site water molecules, one bridging the two Mn(2+) ions and the other terminally coordinated with one of the Mn(2+) ions (Mn1), are involved in catalysis. Recently, a density functional theory study revealed that the two water molecules can be both deprotonated to keep a neutral active site for catalysis...
July 20, 2017: Protein Science: a Publication of the Protein Society
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