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https://www.readbyqxmd.com/read/27933482/effect-of-linker-length-and-flexibility-on-the-clostridium-thermocellum-esterase-displayed-on-bacillus-subtilis-spores
#1
Huayou Chen, Bangguo Wu, Tianxi Zhang, Jinru Jia, Jian Lu, Zhi Chen, Zhong Ni, Tianwei Tan
In fusion protein design strategies, the flexibility and length of linkers are important parameters affecting the bioactivity of multifunctional proteins. A series of fusion proteins with different linkers were constructed. The effect of temperature, pH, and organic solvents was investigated on the enzymatic activity. Fusion proteins with P1(PTPTPT) and P2((PTPTPT)2) linkers remained highly active with wide temperature range. At pH 9.6, the relative activity of fusion proteins with (PTPTPT)2 and S2(EGKSSGSGSESKST) linkers was 70 and 62 % (1...
December 8, 2016: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/27933182/angiopoietin-like-protein-4-and-cardiovascular-function-in-copd
#2
B Waschki, A M Kirsten, O Holz, T Meyer, R Lichtinghagen, K F Rabe, H Magnussen, T Welte, H Watz, S Janciauskiene
INTRODUCTION: The coexistence of chronic obstructive pulmonary disease (COPD) and cardiovascular disease (CVD) is frequent and might be inter-related through inflammation-related processes reflected by specific markers. Here, we studied angiopoietin-like protein 4 (ANGPTL4), an upcoming cardiovascular marker, in stable COPD, and its relationship to cardiovascular function with respect to well-known CVD risk factors. METHODS: In a prospective COPD cohort study, we investigated serum ANGPTL4 levels, vascular status (ankle-brachial index (ABI)) and cardiac function (N-terminal pro-B-type natriuretic peptide (NT-proBNP)) as well as airflow limitation, objectively measured physical activity, the metabolic syndrome, high-sensitive C reactive protein (hs-CRP) and other CVD risk factors at 2 time points...
2016: BMJ Open Respiratory Research
https://www.readbyqxmd.com/read/27932954/neuronal-release-of-cytokine-il-3-triggered-by-mechanosensitive-autostimulation-of-the-p2x7-receptor-is-neuroprotective
#3
Jason C Lim, Wennan Lu, Jonathan M Beckel, Claire H Mitchell
Mechanical strain due to increased pressure or swelling activates inflammatory responses in many neural systems. As cytokines and chemokine messengers lead to both pro-inflammatory and neuroprotective actions, understanding the signaling patterns triggered by mechanical stress may help improve overall outcomes. While cytokine signaling in neural systems is often associated with glial cells like astrocytes and microglia, the contribution of neurons themselves to the cytokine response is underappreciated and has bearing on any balanced response...
2016: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/27932742/differences-in-cancer-characteristics-of-chinese-patients-with-prostate-cancer-who-present-with-different-symptoms
#4
S Ys Chan, C F Ng, K Wm Lee, C H Yee, P Kf Chiu, J Yc Teoh, S Sm Hou
INTRODUCTION: Currently there is no structured prostate cancer screening programme in Asia. Early diagnosis of prostate cancer in Asia is by an opportunistic case-finding approach, that is, offering prostate-specific antigen testing to an individual without obvious symptoms of prostate cancer. In this study, we aimed to investigate the relationship between the mode of presentation and the characteristics of prostate cancers diagnosed in our hospital. METHODS: We recruited 120 consecutive Chinese patients with prostate cancer newly diagnosed from September 2011 to February 2013 in a regional hospital in Hong Kong...
December 9, 2016: Hong Kong Medical Journal, Xianggang Yi Xue za Zhi
https://www.readbyqxmd.com/read/27932681/acute-intermittent-hypoxia-in-rats-activates-muscle-proteolytic-pathways-through-a-glucocorticoid-dependent-mechanism
#5
Franciele Przygodda, Leandro Henrique Manfredi, Juliano Machado, Dawit A P Gonçalves, Neusa Maria Zanon, Leni G H Bonagamba, Benedito H Machado, Isis do Carmo Kettelhut, Luiz C C Navegantes
Although it is well known that chronic hypoxia induces muscle wasting, the effects of intermit-tent hypoxia on skeletal muscle protein metabolism remains unclear. We hypothesized that acute intermittent hypoxia (AIH), a challenge that activates the hypothalamic-pituitary-adrenal axis, would alter muscle protein homeostasis through a glucocorticoid-dependent mechanism. Three-week-old rats were submitted to adrenalectomy (ADX) and exposed to 8 h of AIH (6% O2 for 40s at 9 min intervals). Animals were sacrificed and the soleus and extensor digitorum longus (EDL) muscles were harvested and incubated in vitro for measurements of protein turn-over...
December 8, 2016: Journal of Applied Physiology
https://www.readbyqxmd.com/read/27932449/oral-iron-treatment-response-and-predictors-in-anaemic-adolescents-and-adults-with-ibd-a-prospective-controlled-open-label-trial
#6
David S Rampton, James R Goodhand, Neerav M Joshi, Abu-Bakarr Karim, Yasmine Koodun, Farah M Barakat, Lucia Macken, Douglas G Ward, Tariq H Iqbal, Jenny Epstein, John M Fell, Ian R Sanderson
BACKGROUND: Because of previous concerns about the efficacy and safety of oral iron for treating iron deficiency anaemia in IBD, particularly in young people, we compared the effects of ferrous sulphate on haemoglobin response, disease activity and psychometric scores in adolescents and adults with IBD. We also assessed the relation of baseline serum hepcidin to haemoglobin response. METHODS: We undertook a prospective, open-label, 6-week non-inferiority trial of the effects of ferrous sulphate 200mg twice daily on haemoglobin, iron status, hepcidin, disease activity (Harvey-Bradshaw Index, Simple Colitis Clinical Activity Index, C-reactive protein (CRP), faecal calprotectin and psychometric scores in 45 adolescents (age 13-18 years) and 43 adults (>18 years)...
December 7, 2016: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/27932254/investigating-possible-biological-targets-of-bj-crp-the-first-cysteine-rich-secretory-protein-crisp-isolated-from-bothrops-jararaca-snake-venom
#7
Marina E Lodovicho, Tássia R Costa, Carolina P Bernardes, Danilo L Menaldo, Karina F Zoccal, Sante E Carone, José C Rosa, Manuela B Pucca, Felipe A Cerni, Eliane C Arantes, Jan Tytgat, Lúcia H Faccioli, Luciana S Pereira-Crott, Suely V Sampaio
Cysteine-rich secretory proteins (CRISPs) are commonly described as part of the protein content of snake venoms, nevertheless, so far, little is known about their biological targets and functions. Our study describes the isolation and characterization of Bj-CRP, the first CRISP isolated from Bothrops jararaca snake venom, also aiming at the identification of possible targets for its actions. Bj-CRP was purified using three chromatographic steps (Sephacryl S-200, Source 15Q and C18) and showed to be an acidic protein of 24...
December 5, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27931514/vascular-alterations-in-a-murine-model-of-acute-graft-versus-host-disease-are-associated-with-decreased-serum-levels-of-adiponectin-and-an-increased-activity-and-vascular-expression-of-indoleamine-2-3-dioxygenase
#8
Peter M Schmid, Abdellatif Bouazzaoui, Karin Schmid, Christoph M Birner, Christian Schach, Lars S Maier, Ernst Holler, Dierk H Endemann
Graft-versus-host disease (GVHD) is the limiting complication after bone marrow transplantation (BMT), and its pathophysiology seems to be highly influenced by vascular factors. Our study aimed at elucidating possible mechanisms involved in vascular GVHD. For this purpose, we used a fully MHC-mismatched model of BALB/c mice conditioned according to two different intensity protocols with total body irradiation and transplantation of allogeneic (C57BL/6) or syngeneic bone marrow cells and splenocytes. Mesenteric resistance arteries were studied in a pressurized myograph...
November 2016: Cell Transplantation
https://www.readbyqxmd.com/read/27931258/htra-mediated-e-cadherin-cleavage-is-limited-to-degp-and-degq-homologs-expressed-by-gram-negative-pathogens
#9
Carmen M Abfalter, Maria Schubert, Camilla Götz, Thomas P Schmidt, Gernot Posselt, Silja Wessler
BACKGROUND: The serine proteases HtrA/DegP secreted by the human gastrointestinal pathogens Helicobacter pylori (H. pylori) and Campylobacter jejuni (C. jejuni) cleave the mammalian cell adhesion protein E-cadherin to open intercellular adhesions. A wide range of bacteria also expresses the HtrA/DegP homologs DegQ and/or DegS, which significantly differ in structure and function. METHODS: E-cadherin shedding was investigated in infection experiments with the Gram-negative pathogens H...
December 8, 2016: Cell Communication and Signaling: CCS
https://www.readbyqxmd.com/read/27931178/chemical-composition-and-cytotoxic-properties-of-clinacanthus-nutans-root-extracts
#10
Peik Lin Teoh, Angelina Ying Fang Cheng, Monica Liau, Fui Fui Lem, Grace P Kaling, Fern Nie Chua, Bo Eng Cheong
CONTEXT: Clinacanthus nutans Lindau (Acanthaceae) is a medicinal plant that has been reported to have anti-inflammatory, antiviral, antimicrobial and antivenom activities. In Malaysia, it has been widely claimed to be effective in various cancer treatments but scientific evidence is lacking. OBJECTIVE: This study investigates the chemical constituents, anti-proliferative, and apoptotic properties of C. nutans root extracts. MATERIALS AND METHODS: The roots were subjected to solvent extraction using methanol and ethyl acetate...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/27931163/preparation-characterization-and-in-vitro-anticoagulant-activity-of-corn-stover-xylan-sulfates
#11
He-Li Cheng, Hao Liu, Qing-Hua Feng, Yi-Min Xie, Huai-Yu Zhan
A new anticoagulant agent was prepared by introducing sulfate groups into corn stover xylan through homogeneous reactions. Three organic solvents, N, N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO) and formamide (FA), were adopted as reaction media, with the assistance of LiCl. Structural characterization by FT-IR and (13)CNMR showed that xylan sulfate (XS) could be successfully synthesized with SO3∙Pyridine (SO3∙Py) complexes sulfation reagent in the three media. The effect of sulfation temperature, sulfation time, media type and molar ratio of -SO3/-OH on the degree of substitution (DS) and degree of the polymerization (DP) were studied...
December 8, 2016: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/27931017/lean-body-weight-and-metformin-are-insufficient-to-prevent-endometrial-hyperplasia-in-mice-harboring-inactivating-mutations-in-pten
#12
David A Iglesias, Qian Zhang, Joseph Celestino, Charlotte C Sun, Melinda S Yates, Rosemarie E Schmandt, Karen H Lu
OBJECTIVES: Obesity is a major risk factor for endometrial cancer. We evaluated whether obesity exacerbates progression of endometrial hyperplasia (EH) using the PRCre/+ PTENflox/+ mouse model and examined if the type 2 diabetes drug, metformin, could prevent EH. METHODS: Twenty obese (PRCre/+ PTENflox/+) mice were maintained on a high-fat diet, while 20 lean mice ate a matching low-fat diet. Ten mice from each group received metformin (1,000 mg/day) in drinking water...
December 9, 2016: Oncology
https://www.readbyqxmd.com/read/27930978/mechanism-of-action-and-effect-of-immune-modulating-agents-in-the-treatment-of-psoriasis
#13
Rehab M El-Gharabawy, Amira S Ahmed, Amal H Al-Najjar
OBJECTIVES: The aim of this work is to study the possible mechanisms through which different immune-modulating agents can produce their beneficial effects on treatment of psoriasis and to determine whether the supplementation of these agents for psoriasis patients induces regression of psoriasis. SUBJECTS AND METHODS: One hundred fifty participants were included in this study. The participants were divided into five groups: 1. Normal control group, 2. Psoriasis patients not taking any treatment, 3...
December 5, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27930284/racial-ethnic-differences-in-associations-between-neighborhood-social-cohesion-and-meeting-physical-activity-guidelines-united-states-2013-2014
#14
Stella S Yi, Chau Trinh-Shevrin, Irene H Yen, Simona C Kwon
INTRODUCTION: Neighborhood factors are increasingly recognized as determinants of health. Neighborhood social cohesion may be associated with physical activity, but previous studies examined data aggregated across racial/ethnic groups. We assessed whether neighborhood social cohesion was associated with physical activity in a nationally representative data set and explored the role of race/ethnicity. METHODS: We combined National Health Interview Survey data from 2013 and 2014 (n = 64,754) and constructed a neighborhood social cohesion score by summing responses to 4 questions...
December 8, 2016: Preventing Chronic Disease
https://www.readbyqxmd.com/read/27929522/merging-allylic-c-h-bond-activation-and-c-c-bond-cleavage-en-route-to-the-formation-of-a-quaternary-carbon-stereocenter-in-acyclic-systems
#15
Alexandre Vasseur, Ilan Marek
This protocol describes a diastereoselective approach for the synthesis of complex molecular architectures containing two stereogenic centers in a 1,4 relationship, one of which being an all-carbon quaternary stereogenic center. Such molecules could be intermediates in the synthesis of steroids, for example. Conceived as a single-flask synthetic sequence from ω-ene cyclopropanes, the protocol involves a concerted allylic C-H and C-C bond activation promoted by the Negishi reagent (Cp2Zr(η(2)-butene)). This zirconium-promenade-based procedure affords bifunctionalized products in high diastereomeric ratios after reaction of ω-ene cyclopropanes with the Negishi complex, followed by a thermal treatment and sequential addition of two different electrophiles...
January 2017: Nature Protocols
https://www.readbyqxmd.com/read/27929435/design-of-heterogeneous-hoveyda-grubbs-second-generation-catalyst-lipase-conjugates
#16
Anthony Neville, Javier Iniesta, Jose M Palomo
Heterogeneous catalysts have been synthesi zed by the conjugation of Hoveyda-Grubbs second-generation catalyst with a lipase. The catalytic properties of the organometallic compound in solution were firstly optimized, evaluating the activity of Ru in the ring-closing metathesis of diethyldiallymalonate at 25 °C at different solvents and in the presence of different additives. The best result was found using tetrahydrofuran as a solvent. Some additives such as phenylboronic acid or polyetheneglycol slightly improved the activity of the Ru catalyst whereas others, such as pyridine or dipeptides affected it negatively...
December 6, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27929191/rhodium-catalyzed-c-h-functionalization-with-n-acylsaccharins
#17
Hongxiang Wu, Tingting Liu, Ming Cui, Yue Li, Junsheng Jian, Hui Wang, Zhuo Zeng
A rhodium-catalyzed C-H functionalization with activated amides by decarbonylation has been developed. Notably, this is the first C-H arylation employing N-acylsaccharins as coupling partners to give biaryls in good to excellent yields. The highlight of the work is the high tolerance of functional groups such as formyl, ester, and vinyl and the use of a removable directing group.
December 8, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27929117/cct-complex-restricts-neuropathogenic-protein-aggregation-via-autophagy
#18
Mariana Pavel, Sara Imarisio, Fiona M Menzies, Maria Jimenez-Sanchez, Farah H Siddiqi, Xiaoting Wu, Maurizio Renna, Cahir J O'Kane, Damian C Crowther, David C Rubinsztein
Aberrant protein aggregation is controlled by various chaperones, including CCT (chaperonin containing TCP-1)/TCP-1/TRiC. Mutated CCT4/5 subunits cause sensory neuropathy and CCT5 expression is decreased in Alzheimer's disease. Here, we show that CCT integrity is essential for autophagosome degradation in cells or Drosophila and this phenomenon is orchestrated by the actin cytoskeleton. When autophagic flux is reduced by compromise of individual CCT subunits, various disease-relevant autophagy substrates accumulate and aggregate...
December 8, 2016: Nature Communications
https://www.readbyqxmd.com/read/27928774/a-3d-printed-anatomical-pancreas-and-kidney-phantom-for-optimizing-spect-ct-reconstruction-settings-in-beta-cell-imaging-using-111-in-exendin
#19
Wietske Woliner-van der Weg, Laura N Deden, Antoi P W Meeuwis, Maaike Koenrades, Laura H C Peeters, Henny Kuipers, Geert Jan Laanstra, Martin Gotthardt, Cornelis H Slump, Eric P Visser
BACKGROUND: Quantitative single photon emission computed tomography (SPECT) is challenging, especially for pancreatic beta cell imaging with (111)In-exendin due to high uptake in the kidneys versus much lower uptake in the nearby pancreas. Therefore, we designed a three-dimensionally (3D) printed phantom representing the pancreas and kidneys to mimic the human situation in beta cell imaging. The phantom was used to assess the effect of different reconstruction settings on the quantification of the pancreas uptake for two different, commercially available software packages...
December 2016: EJNMMI Physics
https://www.readbyqxmd.com/read/27928646/preparation-physicochemical-characterization-and-anti-fungal-evaluation-of-nystatin-loaded-plga-glucosamine-nanoparticles
#20
Ghobad Mohammadi, Amineh Shakeri, Ali Fattahi, Pardis Mohammadi, Ali Mikaeili, Alireza Aliabadi, Khosro Adibkia
PURPOSE: Nystatin loaded PLGA and PLGA-Glucosamine nanoparticles were formulated. PLGA were functionalized with Glucosamine (PLGA-GlcN) to enhance the adhesion of nanoparticles to Candida Albicans (C.albicans) cell walls. METHOD: Quasi-emulsion solvent diffusion method was employed using PLGA and PLGA-GlcN with various drug-polymer ratios for the preparation of nanoparticles. The nanoparticles were evaluated for size, zeta potential, polydispersity index, drug crystallinity, loading efficiency and release properties...
December 7, 2016: Pharmaceutical Research
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