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https://www.readbyqxmd.com/read/28651092/role-of-proteoglycans-on-the-biochemical-and-biomechanical-properties-of-dentin-organic-matrix
#1
Cristina de Mattos Pimenta Vidal, Ariene Arcas Leme-Kraus, Momina Rahman, Ana Paula Farina, Ana K Bedran-Russo
OBJECTIVE: Proteoglycans (PGs) are multifunctional biomacromolecules of the extracellular matrix of collagen-based tissues. In teeth, besides a pivotal regulatory role on dentin biomineralization, PGs provide mechanical support to the mineralized tissue and compressive strength to the biosystem. This study assessed enzymatic protocols for selective PGs removal from demineralized dentin to determine the roles of these biomacromolecules in the bulk mechanical properties and biostability of type I collagen...
June 16, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28649187/distinct-proteome-pathology-of-circulating-microparticles-in-systemic-lupus-erythematosus
#2
Ole Østergaard, Christoffer Tandrup Nielsen, Julia T Tanassi, Line V Iversen, Søren Jacobsen, Niels H H Heegaard
BACKGROUND: The pathogenesis of systemic lupus erythematosus (SLE) is poorly understood but has been linked to defective clearance of subcellular particulate material from the circulation. This study investigates the origin, formation, and specificity of circulating microparticles (MPs) in patients with SLE based on comprehensive MP proteome profiling using patients with systemic sclerosis (SSc) and healthy donors (HC) as controls. METHODS: We purified MPs from platelet-poor plasma using differential centrifugation of samples from SLE (n = 45), SSc (n = 38), and two sets of HC (n = 35, n = 25)...
2017: Clinical Proteomics
https://www.readbyqxmd.com/read/28649027/sample-preparation-for-detection-of-low-abundance-proteins-in-human-plasma-using-ultra-high-performance-liquid-chromatography-coupled-with-highly-accurate-mass-spectrometry
#3
Yunseo Seong, Young Sook Yoo, Hafeza Akter, Min-Jung Kang
Proteomics is a valuable approach to discover biomarkers in human plasma for early diagnosis. However, detection of biomarkers in the plasma is still challenging because of its large protein content. In our study, we established albumin/IgG depletion methods for identification of low abundance proteins using two commercial kits with additional buffer conditions and various concentrations of cold acetone. Trypsin digestion, desalting, and data-dependent acquisition were also optimized. More than 80% depletion of albumin/IgG was achieved with two commercial kits and 98% depletion of albumin was obtained with 70% cold acetone...
June 16, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28648518/selective-inhibition-of-bet-proteins-reduces-pancreatic-damage-and-systemic-inflammation-in-bile-acid-and-fatty-acid-ethyl-ester-but-not-caerulein-induced-acute-pancreatitis-in-mice
#4
Wei Huang, Andrea C Haynes, Rajarshi Mukherjee, Li Wen, Diane Latawiec, Alexei V Tepikin, David N Criddle, Rab K Prinjha, Nicholas Smithers, Robert Sutton
OBJECTIVES: To evaluate the therapeutic potential of I-BET-762, an inhibitor of the bromodomain and extra-terminal (BET) protein family, in experimental acute pancreatitis (AP). METHODS: AP was induced in mice by retrograde infusion of taurolithocholic acid sulphate into the biliopancreatic duct (TLCS-AP) or two intraperitoneal (i.p.) injections of ethanol and palmitoleic acid 1 h apart (FAEE-AP) or 12 hourly i.p. injections of caerulein (CER-AP). In all treatment groups, I-BET-762 (30 mg/kg, i...
June 10, 2017: Pancreatology: Official Journal of the International Association of Pancreatology (IAP) ... [et Al.]
https://www.readbyqxmd.com/read/28646761/regulation-on-the-aggregation-induced-emission-aie-of-dna-templated-silver-nanoclusters-by-bsa-and-its-hydrolysates
#5
Wei-Xian Wang, Yuqing Wu, Hong-Wei Li
The aggregation-induced emission (AIE) phenomenon of the metal nanoclusters (NCs) has been discovered quite recently, which is considered to be creative to improve the optical properties of NCs upon ligand aggregation. In the present study, we report an AIE system for double-stranded DNA-templated silver nanoclusters (AgNCs-dsDNA) by using bovine serum albumin (BSA) in solution, which induce a moderate emission enhancement of AgNCs (5-fold) and a blue-shift through a loosen interaction. In addition, significant luminescence enhancement (30-fold) is further stimulated by the addition of digestive enzyme to the system by altering the surface structure of the aggregated particles...
June 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28646424/proteasome-properties-of-hemocytes-differ-between-the-whiteleg-shrimp-penaeus-vannamei-and-the-brown-shrimp-crangon-crangon-crustacea-decapoda
#6
Sandra Götze, Reinhard Saborowski, Oliviert Martínez-Cruz, Adriana Muhlia-Almazán, Arturo Sánchez-Paz
Crustaceans are intensively farmed in aquaculture facilities where they are vulnerable to parasites, bacteria, or viruses, often severely compromising the rearing success. The ubiquitin-proteasome system (UPS) is crucial for the maintenance of cellular integrity. Analogous to higher vertebrates, the UPS of crustaceans may also play an important role in stress resistance and pathogen defense. We studied the general properties of the proteasome system in the hemocytes of the whiteleg shrimp, Penaeus vannamei, and the European brown shrimp Crangon crangon...
June 23, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28645315/role-of-inhibitors-of-serine-peptidases-in-protecting-leishmania-donovani-against-the-hydrolytic-peptidases-of-sand-fly-midgut
#7
Sudha Verma, Sushmita Das, Abhishek Mandal, Md Yousuf Ansari, Sujata Kumari, Rani Mansuri, Ajay Kumar, Ruby Singh, Savita Saini, Kumar Abhishek, Vijay Kumar, Ganesh Chandra Sahoo, Pradeep Das
BACKGROUND: In vector-borne diseases such as leishmaniasis, the sand fly midgut is considered to be an important site for vector-parasite interaction. Digestive enzymes including serine peptidases such as trypsin and chymotrypsin, which are secreted in the midgut are one of the obstacles for Leishmania in establishing a successful infection. The presence of some natural inhibitors of serine peptidases (ISPs) has recently been reported in Leishmania. In the present study, we deciphered the role of these ISPs in the survival of Leishmania donovani in the hostile sand fly midgut environment...
June 23, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28644504/a-structural-mechanism-of-flavonoids-in-inhibiting-serine-proteases
#8
Guangpu Xue, Lihu Gong, Cai Yuan, Mingming Xu, Xu Wang, Longguang Jiang, Mingdong Huang
Quercetin is a member of the flavonoids and was previously demonstrated to inhibit trypsin-like serine proteases at micromolar potencies. Different molecular models were proposed to explain such inhibition. However, controversies remain on the molecular details of inhibition. Here, we report the X-ray crystal structure of quercetin in a complex with the urokinase-type plasminogen activator (uPA), an archetypical serine protease. The structure showed that quercetin binds to the specific substrate binding pocket (S1 pocket) of uPA mainly through its two neighboring phenolic hydroxyl groups...
June 23, 2017: Food & Function
https://www.readbyqxmd.com/read/28644028/understanding-the-effects-of-genotype-growing-year-and-breeding-on-tunisian-durum-wheat-allergenicity-part-1-the-baker-s-asthma-case
#9
Fatma Boukid, Barbara Prandi, Stefano Sforza, Rhouma Sayar, Yong Weon Seo, Mondher Mejri, Ines Yacoubi
Baker's asthma is a serious airway disease triggered by wheat proteins CM3 α-amylase/trypsin inhibitor. The purpose of the present study was to investigate the impact of genotype and crop year on allergen CM3 α-amylase/trypsin inhibitor associated to baker's asthma. A historical series of Tunisian durum wheat (100 accessions), derived from three crop years, was used to compare the amount of CM3 from landraces to advanced cultivars. CM3 protein quantification was assessed after an enzymatic cleavage of the soluble protein extracts on an UPLC/ESI-MS system, using a marker peptide for its quantification...
June 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28636671/different-residues-in-the-sars-cov-spike-protein-determine-cleavage-and-activation-by-the-host-cell-protease-tmprss2
#10
Lennart Michel Reinke, Martin Spiegel, Teresa Plegge, Anika Hartleib, Inga Nehlmeier, Stefanie Gierer, Markus Hoffmann, Heike Hofmann-Winkler, Michael Winkler, Stefan Pöhlmann
The spike (S) protein of severe acute respiratory syndrome coronavirus (SARS-CoV) mediates viral entry into target cells. Cleavage and activation of SARS S by a host cell protease is essential for infectious viral entry and the responsible enzymes are potential targets for antiviral intervention. The type II transmembrane serine protease TMPRSS2 cleaves and activates SARS S in cell culture and potentially also in the infected host. Here, we investigated which determinants in SARS S control cleavage and activation by TMPRSS2...
2017: PloS One
https://www.readbyqxmd.com/read/28636127/nonmediated-label-free-based-detection-of-cardiovascular-biomarker-in-a-biological-sample
#11
JuKyung Lee, SuRyon Shin, Anna Desalvo, Geonhui Lee, Jeong Yoon Lee, Alessandro Polini, Sukyoung Chae, Hobin Jeong, Jonghan Kim, Haksoo Choi, HeaYeon Lee
Direct electrochemical (EC) monitoring in a cell culture medium without electron transporter as called mediator is attractive topic in vitro organoid based on chip with frequently and long-time monitoring since it can avoid to its disadvantage as stability, toxicity. Here, direct monitoring with nonmediator is demonstrated based on impedance spectroscopy under the culture medium in order to overcome the limitation of mediator. The applicability of EC monitoring is shown by detecting alpha-1-anti trypsin (A1AT) which is known as biomarkers for cardiac damage and is widely chosen in organoid cardiac cell-based chip...
June 21, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28634118/identification-of-chickpea-seed-proteins-resistant-to-simulated-in-vitro-human-digestion
#12
I C Ribeiro, C C Leclercq, N Simões, A Toureiro, I Duarte, J B Freire, M M Chaves, J Renaut, C Pinheiro
Proteins and peptides able to resist gastrointestinal digestion and reach the intestinal mucosa have the potential to influence human health. Chickpea (Cicer arietinum L.) seed proteins are able to resist cooking (86.9% total protein) and/or in vitro simulated human digestion (15.9% total protein resists soaking, cooking and digestion with pepsin and pancreatin). To identify and characterize proteins resisting digestion we made use of different MS methodologies. The efficiency of several proteases (trypsin, AspN, chymotrypsin and LysC) was tested, and two technologies were employed (MALDI-TOF-TOF and LC-nESI-MS/MS)...
June 17, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28631312/the-flow-and-fate-of-digestive-enzymes-in-the-field-cricket-gryllus-bimaculatus
#13
Joseph Woodring
The flow of enzymes, the ratio of bound to unbound enzymes, and their inactivation in the cricket Gryllus bimaculatus was studied. The digestive enzymes are forced forward into the crop by caecal contraction and then they are mixed with freshly chewed food and saliva, forming a crop-chyme. This chyme is blended by crop peristalsis, and periodic opening of the preproventricular valve (PPV) allows posterior movement into the proventriculus and further into the midgut. The contraction of the crop is modulated by Grybi-AST and Grybi-SK peptides, which are partially secreted by the caecal endocrine cells...
June 20, 2017: Archives of Insect Biochemistry and Physiology
https://www.readbyqxmd.com/read/28630621/development-of-snp-genotyping-assays-for-seed-composition-traits-in-soybean
#14
Gunvant Patil, Juhi Chaudhary, Tri D Vuong, Brian Jenkins, Dan Qiu, Suhas Kadam, Grover J Shannon, Henry T Nguyen
Seed composition is one of the most important determinants of the economic values in soybean. The quality and quantity of different seed components, such as oil, protein, and carbohydrates, are crucial ingredients in food, feed, and numerous industrial products. Soybean researchers have successfully developed and utilized a diverse set of molecular markers for seed trait improvement in soybean breeding programs. It is imperative to design and develop molecular assays that are accurate, robust, high-throughput, cost-effective, and available on a common genotyping platform...
2017: International Journal of Plant Genomics
https://www.readbyqxmd.com/read/28630443/chemical-chaperone-tudca-unlike-pba-mitigates-protein-aggregation-efficiently-and-resists-er-and-non-er-stress-induced-hepg2-cell-death
#15
Jagadeesh Kumar Uppala, Amina R Gani, Kolluru V A Ramaiah
Stress induced BSA (bovine serum albumin) protein aggregation is effectively mitigated in vitro by TUDCA (tauroursodeoxycholic acid) than by PBA (4- phenylbutyric acid), chemical chaperones approved by FDA for the treatment of biliary cirrhosis and urea cycle disorders respectively. TUDCA, unlike PBA, enhances trypsin mediated digestion of BSA. TUDCA activates PERK, an ER-resident kinase that phosphorylates the alpha-subunit of eukaryotic initiation factor2 (eIF2α) and promotes the expression of activated transcription factor 4 (ATF4) in HepG2 cells...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630289/green-mamba-peptide-targets-type-2-vasopressin-receptor-against-polycystic-kidney-disease
#16
Justyna Ciolek, Helen Reinfrank, Loïc Quinton, Say Viengchareun, Enrico A Stura, Laura Vera, Sabrina Sigismeau, Bernard Mouillac, Hélène Orcel, Steve Peigneur, Jan Tytgat, Laura Droctové, Fabrice Beau, Jerome Nevoux, Marc Lombès, Gilles Mourier, Edwin De Pauw, Denis Servent, Christiane Mendre, Ralph Witzgall, Nicolas Gilles
Polycystic kidney diseases (PKDs) are genetic disorders that can cause renal failure and death in children and adults. Lowering cAMP in cystic tissues through the inhibition of the type-2 vasopressin receptor (V2R) constitutes a validated strategy to reduce disease progression. We identified a peptide from green mamba venom that exhibits nanomolar affinity for the V2R without any activity on 155 other G-protein-coupled receptors or on 15 ionic channels. Mambaquaretin-1 is a full antagonist of the V2R activation pathways studied: cAMP production, beta-arrestin interaction, and MAP kinase activity...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28629068/a-novel-alginate-encapsulated-system-to-study-biological-response-to-critical-sized-wear-particles-of-uhmwpe-loaded-with-alendronate-sodium
#17
Yumei Liu, Feng Shi, Lin Bo, Wei Zhi, Jie Weng, Shuxin Qu
The aim of this study was to develop a novel alginate-encapsulated system (Alg beads) to investigate the cell response to critical-sized wear particles of ultra-high molecular weight polyethylene loaded with alendronate sodium (UHMWPE-ALN), one of the most effective drugs to treat bone resorption in clinic. The extrusion method was used to prepare Alg beads encapsulating rat calvarial osteoblasts (RCOs) and critical-sized UHMWPE-ALN wear particles with spherical morphology and uniform size. The morphology, permeability and stability of Alg beads were characterized...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28627736/enzyme-free-cell-detachment-mediated-by-resonance-vibration-with-temperature-modulation
#18
Yuta Kurashina, Makoto Hirano, Chikahiro Imashiro, Kiichiro Totani, Jun Komotori, Kenjiro Takemura
Cell detachment is an essential process in adherent cell culture. However, trypsinization, which is the most popular detachment technique used in culture, damages cellular membranes. Reducing cellular membrane damage during detachment should improve the quality of cell culture. In this article, we propose an enzyme-free cell detachment method based on resonance vibration with temperature modulation. We developed a culture device that can excite a resonance vibration and control temperature. We then evaluated the cell detachment ratio and the growth response, observed the morphology and analyzed the cellular protein of the collected cells-mouse myoblast cell line (C2C12)...
June 19, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28627405/the-effects-of-dietary-leucine-on-the-growth-performances-body-composition-metabolic-abilities-and-innate-immune-responses-in-black-carp-mylopharyngodon-piceus
#19
Chenglong Wu, Lian Chen, Zhibin Lu, Jun'e Gao, Yudan Chu, Liang Li, Ming Wang, Geying Zhang, Miaotong Zhang, Jinyun Ye
The present study was focused on the growth, body composition, metabolic abilities and innate immune responses in juvenile black carp Mylopharyngodon piceus fed with six levels of dietary leucine (7.3, 12.4, 16.2, 21.9, 28.3 and 34.5 g kg(-1)) for 9 weeks. Results showed that the highest weight gain (WG) and the lowest feed conversion ratio (FCR) was obtained at 23.5 and 23.9 g kg(-1) dietary leucine using second-order polynomial model, respectively. Adequate dietary leucine content (21.9 and 28.3 g kg(-1)) could significantly up-regulate the expression levels of neuropeptide Y (NPY) and ghrelin (GRL) in the brain of black carp juveniles...
June 13, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28625747/molecular-identification-and-characterization-of-haptoglobin-in-teleosts-revealed-an-important-role-on-fish-viral-infections
#20
Héctor Cordero, Chang Hong Li, Elena Chaves-Pozo, María Ángeles Esteban, Alberto Cuesta
Haptoglobin (Hp) molecule has been cloned and characterized in two marine teleosts (gilthead seabream and European sea bass), obtaining putative proteins of 319 residues encoded by an ORF of 960 bp in both species. However, the matrix of similarity revealed low identities among bony fish species 78.9% (seabream-sea bass), 43% (seabream/seabass-zebrafish) and lower than 20% with sharks and human. The protein sequences showed a signal peptide from the position 1 to 23, a trypsin domain from 47 to 297, and several predicted disulfide bridges and glycosylation sites...
June 16, 2017: Developmental and Comparative Immunology
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