bluuebunny/crossref_metadata_2025_split huggingface dataset:
CCND1 rs9344 polymorphisms are associated with the genetic susceptibility to cervical cancer in Chinese population
Authors: Wang Ning , Qian Xiuyan , Wang Shizhuo , Gao Hong , Wang Lili , Huo Yunlong , Zhang Shulan 
Published: May 2011

AbstractCyclin D1, with a common G/A polymorphism in rs9344, is an essential regulator of the G1 phase in cell cycles and plays an important role in several tumor types, and the homology of cyclin D1 with human papillomavirus (HPV)‐16 E7 brought our attention to CCND1 gene in cervical cancer. A total of 738 native Chinese subjects consist of 327 cases and 411 controls were enrolled in this study. CCND1 genotyping was analyzed by polymerase chain reaction‐restriction fragment length polymorphism (PCR‐RFLP) and partially verified by sequencing of genomic DNA and cDNA. The transcription of cyclin D1 mRNA isoforms was analyzed by quantitative PCR; expression of protein isoforms by immunohistochemistry and Western blotting. We observed that the AA genotype had decreased risk of developing cervical cancer (odds ratio [OR] = 0.332; 95% confidence interval [CI] = 0.113–0.978; P = 0.045). The two mRNA isoforms were both transcripted from A and G allele. Transcript b decreased in squamous cell carcinoma of the uterine cervix (SCCUC) group (P = 0.004), especially poorly differentiated group (P = 0.004), and in G allele group of normal subjects (P = 0.001). In immunohistochemistry analysis, cyclins D1, D1a, and D1b failed to correlate with cervical cancer (P = 0.808, 0.445, and 0.095). However, cyclin D1b was downregulated in SCCUC group analyzed by Western blotting (P = 0.039). This study indicates that CCND1 rs9344 polymorphisms confer host susceptibility to cervical cancer. A allele possesses a relative protective effect probably through the cyclin D1b's inhibition on HPV carcinogenesis. © 2011 Wiley Periodicals, Inc.
Hospital‐based home care for children with cancer
Authors: Hansson Helena , Hallström Inger , Kjærgaard Hanne , Johansen Christoffer , Schmiegelow Kjeld 
Published: May 2011

AbstractHospital‐based home care (HBHC) is widely applied in Pediatric Oncology. We reviewed the potential effect of HBHC on children's physical health and risk of adverse events, parental and child satisfaction, quality of life of children and their parents, and costs. A search of PubMed, CINAHL, and EMBASE led to identification of five studies that met the inclusion criteria. All sample sizes were small, and both the interventions and the outcome measures were diverse. Although burdened by these limitations, the studies indicate that HBHC is feasible and carries no crucial negative effects for children with cancer. Pediatr Blood Cancer 2011; 57: 369–377. © 2011 Wiley‐Liss, Inc.
Novel hyperbranched waterborne polyurethane‐urea/silica hybrid coatings and their characterizations
Authors: Jena Kishore K , Sahoo Sambita , Narayan Ramanuj , Aminabhavi Tejraj M , Raju KVSN 
Published: May 2011

AbstractThermally resistant and mechanically stable novel hyperbranched waterborne polyurethane‐urea/silica hybrid coatings were prepared by using 3‐aminopropyltriethoxysilane as a coupling agent with SiO2 as a crosslinker. The extent of hydrogen bonding was investigated to show a dependence on SiO2 concentration, which increased the glass transition temperature of the polymers with increasing SiO2 concentration. Thermal decomposition profiles and the corresponding stability data suggest two‐step decomposition for the hybrids; further, their stability increased with increasing concentration of SiO2.Copyright © 2011 Society of Chemical Industry
Thermodynamic investigation of thermoresponsive xanthan‐poly (N‐isopropylacrylamide) hydrogels
Authors: Hamcerencu Mihaela , Desbrieres Jacques , Khoukh Abdel , Popa Marcel , Riess Gérard 
Published: May 2011

AbstractPolysaccharide‐based hydrogels, such as xanthan maleate/poly(N‐isopropylacrylamide) (PNIPAAm) interpenetrated polymer networks, are thermostimulable materials of interest for the controlled release of biologically active components due to conformation changes at the low critical‐solution temperature (LCST) PNIPAAm phase transition. The phase transition of these interpenetrated polymer network hydrogels, where PNIPAAm is in a ‘confined’ environment, was examined by high resolution magic angle spinning nuclear magnetic resonance and differential scanning calorimetry. High resolution magic angle spinning nuclear magnetic resonance spectroscopy allows the accurate determination of LCST and an evaluation of the corresponding thermodynamic data. More particularly, the evolution of these data as a function of the composition of the hydrogel, and of the external parameters such as pH and ionic strength, was considered. LCST shows a minimal value with increasing xanthan content. Moreover, it was possible to calculate, as a function of temperature, the fraction of NIPAAm which remains uncollapsed. The data obtained for pure PNIPAAm hydrogels are in good agreement with recently published results. The phase transition of PNIPAAm in a diphasic hydrogel is broader when PNIPAAm is ‘confined’ within an interpenetrated polymer network than in a pure PNIPAAm crosslinked network. The widening of the transition with increasing xanthan content indicates a reduction of the PNIPAAm interchain aggregation in a network structure. Copyright © 2011 Society of Chemical Industry
The effect of the soft segment of prepolymers on properties of poly(urethane‐ester) and its biodegradability
Authors: Arcana I Made , Bundjali Bunbun , Hasan M , Zulfikar Muhamad Ali , Hariyawati Ketut 
Published: May 2011

AbstractThe influence of soft‐segment prepolymers prepared through the polymerization of δ‐valerolactone (VL) and 2,2‐dimethyl‐1,3‐propandiol (DP) monomers on the structure and properties of poly(urethane‐ester) as well as its biodegradability were investigated. Poly(urethane‐ester) was prepared in two steps. The first step was the preparation of prepolymers with various chain lengths by polymerizing VL and DP monomers in the presence of a distannoxane catalyst at 100 °C under nitrogen atmosphere. The second step was the preparation of poly(urethane‐ester) by polymerizing 4,4′‐methylene‐bis(phenyl isocyanate) (MDI) and prepolymers with various chain lengths in the absence of catalysts. The poly(urethane‐ester) was characterized through an analysis of functional groups (FTIR), thermal properties (differential thermal analysis/TGA), mechanical properties (tensile tester), crystallinity (XRD) and biodegradability. An increased chain length of the prepolymer used in polymerization with MDI leads to an increase in the thermal properties and crystallinity of poly(urethane‐ester). However, the maximum biodegradability in the activated sludge was observed in the poly(urethane‐ester) prepared by polymerizing MDI and prepolymers with a molar VL/DP ratio of 20/1. The amorphous parts of polymers were more easily decomposed by microorganism enzymes than were the crystalline parts after an incubation period of 30 days. Copyright © 2011 Society of Chemical Industry
ErbB2‐associated changes in the lysosomal proteome
Authors: Nylandsted Jesper , Becker Andrea C. , Bunkenborg Jakob , Andersen Jens S. , Dengjel Jörn , Jäättelä Marja 
Published: May 2011

AbstractLate endosomes and lysosomes (hereafter referred to as lysosomes) play an essential role in the turnover of cellular macromolecules and organelles. Their biochemical characterization has so far depended on purification methods based on either density gradient centrifugations or magnetic purification of iron‐loaded organelles. Owing to dramatic changes in lysosomal density and stability associated with lysosomal diseases and cancer, these methods are not optimal for the comparison of normal and pathological lysosomes. Here, we introduce an efficient method for the purification of intact lysosomes by magnetic immunoprecipitation with antibodies against the vacuolar‐type H+‐ATPase. Quantitative MS‐based proteomics analysis of the obtained lysosomal membranes identified 60 proteins, most of which have previously been associated with the lysosomal compartment. Interestingly, the lysosomal membrane proteome was significantly altered by the ectopic expression of an active form of the ErbB2 oncogene, which renders the cells highly metastatic. The furthermost ErbB2‐associated changes included increased levels of CD63, S100A11 and ferritin heavy chain. Overall, our data introduce the antibody‐based purification of lysosomes as a suitable method for the characterization of lysosomes from a variety of pathological conditions with altered lysosomal density and stability.
Investigation of POPX2 phosphatase functions by comparative phosphoproteomic analysis
Authors: Singh Pritpal , Gan Chee Sian , Guo Tiannan , Phang Hui‐Qun , Sze Siu Kwan , Koh Cheng Gee 
Published: May 2011

AbstractIdentifying the substrates and biochemical pathway regulated by phosphatases has always been more challenging than finding those regulated by kinases. Here, we report the use of phosphoproteomic methods to analyse the pathways regulated by POPX2 (partner of PIX 2) phosphatase. POPX2 is a serine/threonine phosphatase, found in many cancer types. The levels of the POPX2 have been found to be up‐regulated in the more invasive breast cancer cells compared with non‐invasive ones. Our observations also suggest that POPX2 level is positively correlated with cell motility. Thus, finding substrates or pathways regulated by POPX2 will help to elucidate the regulatory mechanism of cancer cell motility and invasiveness. We have also developed and validated a protocol using electrostatic repulsion‐hydrophilic interaction chromatography (ERLIC) to enrich the phosphopeptides followed by LC‐MS/MS to allow comparison between the phosphoproteomes of control and POPX2 overexpressing cells. With this approach, we were able to identify a biochemical pathway through which POPX2 exerts its apparent cellular function: the regulation of activity of glycogen synthase kinase‐3, which in turn modulates extracellular signal‐regulated kinase and cell motility.
Comparison between procedures using SDS for shotgun proteomic analyses of complex samples
Authors: Bereman Michael S. , Egertson Jarrett D. , MacCoss Michael J. 
Published: May 2011

AbstractFilter‐aided sample preparation (FASP) and a new sample preparation method using a modified commercial SDS removal spin column are quantitatively compared in terms of their performance for shotgun proteomic experiments in three complex proteomic samples: a Saccharomyces cerevisiae lysate (insoluble fraction), a Caenorhabditis elegans lysate (soluble fraction), and a human embryonic kidney cell line (HEK293T). The characteristics and total number of peptides and proteins identified are compared between the two procedures. The SDS spin column procedure affords a conservative fourfold improvement in throughput, is more reproducible, less expensive (i.e. requires less materials), and identifies between 30 and 107% more peptides at q≤0.01, than the FASP procedure. The peptides identified by SDS spin column are more hydrophobic than species identified by the FASP procedure as indicated by the distribution of GRAVY scores. Ultimately, these improvements correlate to as great as a 50% increase in protein identifications with two or more peptides.
Effects of postmortem storage temperature on sea bass (Dicentrarchus labrax) muscle protein degradation: Analysis by 2‐D DIGE and MS
Authors: Terova Genciana , Addis Maria Filippa , Preziosa Elena , Pisanu Salvatore , Pagnozzi Daniela , Biosa Grazia , Gornati Rosalba , Bernardini Giovanni , Roggio Tonina , Saroglia Marco 
Published: May 2011

AbstractStorage conditions are known to be important for postmortem deterioration of fish muscle, and temperature is one of the factors with the strongest impact on this process. In order to shed light on the influence of temperature on the status of sea bass (Dicentrarchus labrax) muscle proteins during postmortem storage, a 2‐D DIGE and mass spectrometry study was performed on fish kept at either 1 or 18°C for 5 days. As expected, the greatest alterations in sea bass filet protein composition were observed upon postmortem storage at 18°C, with distinct changes appearing in the 2‐D protein profile after 5 days of storage at this temperature. In particular, degradation of the myofibrillar protein myosin heavy chain and of the glycolytic enzyme glyceraldehyde‐3‐phosphate dehydrogenase, among the most abundant muscle proteins, could be clearly observed upon storage at higher temperatures. Although to a lesser extent, however, several proteins were observed to vary in abundance also upon storage for 5 days at 1°C. In particular, one of the most interesting observations was the rapid and significant decrease in the abundance of nucleoside diphosphate kinase B and phosphoglycerate mutase 2, which was observed also at low storage temperatures and appeared to be temperature‐independent. The results of this study offer new knowledge on changes occurring in sea bass muscle proteins during postmortem storage at different temperatures and provide indications on protein degradation trends that might be useful for monitoring freshness of fish and quality of storage conditions.
Poly‐2‐oxazoline‐derived polyurethanes: A versatile synthetic approach to renewable polyurethane thermosets
Authors: Del Rio Enrique , Lligadas Gerard , Ronda Juan Carlos , Galià Marina , Cádiz Virginia 
Published: May 2011

Abstract2‐Nonyl‐2‐oxazoline and 2‐(9‐decenyl)‐2‐oxazoline have been copolymerized in different proportions by cationic ring‐opening polymerization to obtain a series of random linear copolymers with tailored molecular weight and double bond functionality in the side chains. Thiol‐ene addition of 2‐mercaptoethanol has been used to produce a set of polyoxazoline–polyols under mild conditions and with quantitative double bond transformation. The polyols obtained in this way were reacted with methylene‐bis(phenylisocyanate) to yield a series of amorphous and semicrystalline polyurethane networks. The thermal stability and the thermomechanical properties of these thermosets have been studied and related with the structure of the parent polyols. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
Synthesis and properties of novel triptycene‐based polyimides
Authors: Hsiao Sheng‐Huei , Wang Hui‐Min , Chen Wen‐Jeng , Lee Tzong‐Ming , Leu Chyi‐Ming 
Published: May 2011

AbstractTwo new triptycene‐containing bis(ether amine)s, 1,4‐bis(4‐aminophenoxy)triptycene (4) and 1,4‐bis(4‐amino‐2‐trifluoromethylphenoxy)triptycene (6), were synthesized, respectively, from the nucleophilic chloro‐displacement reactions of p‐chloronitrobenzene and 2‐chloro‐5‐nitrobenzotrifluoride with 1,4‐dihydroxytriptycene in the presence of potassium carbonate, followed by palladium‐catalyzed hydrazine reduction of the dinitro intermediates. The bis(ether amine)s were polymerized with six commercially available aromatic tetracarboxylic dianhydrides to obtain two series of novel triptycene‐based polyimides 8a–f and 9a–f by using a conventional two‐step synthetic method via thermal and chemical imidizations. All the resulting polyimides exhibited high enough molecular weights to permit the casting of flexible and strong films with good mechanical properties. Incorporation of trifluoromethyl groups in the polyimide backbones improves their solubility and decreases their dielectric constants. The fluorinated polyimides 9d and 9f derived from diamine 6 with 4,4′‐oxydiphthalic anhydride and 2,2‐bis(3,4‐dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), respectively, could afford almost colorless thin films. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011
Theoretical study of spectroscopic properties of insulated molecular wires formed by substituted oligothiophenes and cross‐linked α‐cyclodextrin
Authors: Venâncio Mateus F. , Nascimento Clebio S. , Anconi Cleber P. A. , Lopes Juliana Fedoce , Rocha Willian R. , Dos Santos Hélio F. , De Almeida Wagner B. 
Published: May 2011

AbstractThe inclusion compound formed between cross‐linked α‐cyclodextrin dimer and substituted oligothiophene, was investigated using density functional theory (DFT). Energy gap, spectroscopy (IR, UV–vis, 13C NMR, and 1H NMR) and first hyperpolarizability data were analyzed for the free species and inclusion compound, pp‐PT@(αCD–αCD). The semiconducting property of the included pp‐PT was not substantially affected on inclusion, with the energy gap increasing by only 10% after interaction with αCD–αCD. On the other hand, the nonlinear optical (NLO) response was significantly decreased, with the first hyperpolarizability, β, predicted to be just more than 60% lower for the [2]rotaxane than for free pp‐PT, but still having considerable magnitude. This was explained by the two‐state model based on the charge‐transfer contribution to the electronic transitions. The sensitivity of electronic spectra might also be useful for the inclusion complex characterization. The IR spectrum was slightly sensitive to the host–guest interaction and the calculated 13C NMR and 1H NMR chemical shifts for the pp‐PT guest showed appreciable variations of 5–10 and 1–1.5 ppm, respectively, and so can be used for the characterization of inclusion compounds. We concluded that the formation of inclusion complexes with CDs, seems indeed very promising and the use of encapsulating conducting material should be experimentally pursued. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011
Backdoor opening mechanism in acetylcholinesterase based on X‐ray crystallography and molecular dynamics simulations
Authors: Sanson Benoît , Colletier Jacques‐Philippe , Xu Yechun , Lang P. Therese , Jiang Hualiang , Silman Israel , Sussman Joel L. , Weik Martin 
Published: May 2011

AbstractThe transient opening of a backdoor in the active‐site wall of acetylcholinesterase, one of nature's most rapid enzymes, has been suggested to contribute to the efficient traffic of substrates and products. A crystal structure of Torpedo californica acetylcholinesterase in complex with the peripheral‐site inhibitor aflatoxin is now presented, in which a tyrosine at the bottom of the active‐site gorge rotates to create a 3.4‐Å wide exit channel. Molecular dynamics simulations show that the opening can be further enlarged by movement of Trp84. The crystallographic and molecular dynamics simulation data thus point to the interface between Tyr442 and Trp84 as the key element of a backdoor, whose opening permits rapid clearance of catalysis products from the active site. Furthermore, the crystal structure presented provides a novel template for rational design of inhibitors and reactivators, including anti‐Alzheimer drugs and antidotes against organophosphate poisoning.
Increased high‐sensitivity c‐reactive protein predicts a high risk of lower urinary tract symptoms in chinese male: Results from the fangchenggang area male health and examination survey
Authors: Lu Zheng , Gao Yong , Tan Aihua , Yang Xiaobo , Zhang Haiying , Mo Linjian , Wu Chunlei , Hu Yanling , Mo Zengnan 
Published: May 2011

AbstractBACKGROUNDReports have shown that increased serum C‐reactive protein (CRP) suggests a risk of lower urinary tract symptoms (LUTS) in the West population. However, few studies have investigated the role of CRP as regards LUTS in a Chinese male population.METHODSData were collected from 1,452 men who participated in the population‐based Fangchenggang Area Male Health and Examination Survey (FAMHES), which was carried out in Guangxi, China, from September 2009 to December 2009. In the current study, serum CRP was measured with a high‐sensitivity method (hsCRP) and LUTS was assessed by International Prostate Symptom Score (IPSS). Meanwhile, information about potential confounding variables (smoking, hypertension, diabetes, etc.) were included.RESULTSWe observed that statistically significant distinction presented in the distribution of hsCRP levels and age between LUTS group and non‐LUTS group (P < 0.001). Comparing with the lowest hsCRP tertile, men with the highest hsCRP tertile were 1.72 times more likely to have overall LUTS and 1.93 times more likely to have irritative symptoms. As for individual symptoms of LUTS, statistically significant correlations were noted between serum hsCRP levels and urgency (OR = 1.74, 95% CI = 1.09–2.78) and nocturia (OR = 1.64, 95% CI = 1.18–2.27), when comparing them from the 1st to 3rd hsCRP tertiles. After multivariate adjusted, the results changed slightly and were still significant.CONCLUSIONSIn a Chinese male population, we firstly confirmed a positive correlation of serum hsCRP with LUTS. It can be inferred that inflammation may be involved in the processes of LUTS. Prostate 72:193–200, 2012. © 2011 Wiley Periodicals, Inc.
Isoforms of the heteropteran Nezara viridula ecdysone receptor: protein characterisation, RH5992 insecticide binding and homology modelling
Authors: Tohidi‐Esfahani Donya , Lawrence Michael C , Graham Lloyd D , Hannan Garry N , Simpson Ann M , Hill Ronald J 
Published: May 2011

AbstractBACKGROUND: Certain bisacylhydrazine compounds such as tebufenozide (RH5992) have been shown to act as order‐specific insecticides. Their compatibility with predatory Heteroptera, which are used as biological control agents, has also been demonstrated. However, the molecular mode of action of these ecdysone agonists has not been explored in a heteropteran, much less one that is a significant agricultural pest, such as Nezara viridula.RESULTS: Alternatively spliced ligand‐binding regions of the N. viridula ecdysone receptor were expressed, purified and characterised by 2D gel analysis, mass spectrometry, homology modelling and competitive binding of a bisacylhydrazine insecticidal compound (RH5992) and various ecdysteroids. Ligand binding by the two splice isoforms was indistinguishable, and relative affinities were found to occur in the order muristerone A > ponasterone A > 20‐hydroxyecdysone > inokosterone > RH5992 > α‐ecdysone.CONCLUSION: The predicted difference in amino acid sequence between the ligand‐binding domains of the N. viridula ecdysone receptor splice variants was verified by mass spectrometry. Both splice variant isoforms exhibit a greater affinity for the bisacylhydrazine insecticide RH5992 than do the other hemipteran ecdysone receptors characterised to date. Their affinities for a range of ecdysteroids also distinguish them from the ecdysone receptors of other Hemiptera characterised thus far. Homology models of both N. viridula receptor isoforms provide further insight into the bisacylhydrazine‐ and ecdysteroid‐binding properties of these receptors, including their similar affinity for 20‐hydroxyecdysone and the postulated pentatomomorphan moulting hormone makisterone A. Copyright © 2011 Society of Chemical Industry