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https://www.readbyqxmd.com/read/28433941/self-assembled-dual-responsive-micelles-stabilized-with-protein-for-co-delivery-of-drug-and-sirna-in-cancer-therapy
#1
M R Aji Alex, Chetan Nehate, Srivani Veeranarayanan, D Sakthi Kumar, Ritu Kulshreshtha, Veena Koul
Design of safe and efficient vehicles for the combinatorial delivery of drugs and genetic agents is an emerging requisite for achieving enhanced therapeutic effect in cancer. Even though several nanoplatforms have been explored for the co-delivery of drugs and genetic materials the translation of these systems to clinical phase is still a challenge, mainly due to tedious synthesis procedures, lack of serum stability, inefficient scalability etc. Here in, we report development of reduction and pH sensitive polymeric graft of low molecular weight poly (styrene -alt -maleic anhydride) and evaluation of its efficacy in co-delivering drug and siRNA...
April 17, 2017: Biomaterials
https://www.readbyqxmd.com/read/28433858/reduced-graphene-oxide-chitosan-aptamer-interface-as-new-platform-for-ultrasensitive-detection-of-human-epidermal-growth-factor-receptor-2
#2
Arezoo Tabasi, Abdollah Noorbakhsh, Ensiyeh Sharifi
The present work describes an ultrasensitive electrochemical aptamer-based assay for detection of human epidermal growth factor receptor 2 protein (HER2) cancer biomarker as a model analyte. Results show that the reduced graphene oxide-chitosan (rGO-Chit) film as a suitable electrode material possesses great favorable properties including high homogeneity, good stability, large surface area and high fraction of amine groups as aptamer binding sites. Various steps of aptasensor fabrication were characterized using microscopic, energy-dispersive X-ray spectroscopy (EDAX), Fourier transform infrared (FTIR) spectroscopy and electrochemical techniques...
April 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28433751/elevated-chaperone-proteins-are-a-feature-of-winter-freeze-avoidance-by-larvae-of-the-goldenrod-gall-moth-epiblema-scudderiana
#3
Guijun Zhang, Janet M Storey, Kenneth B Storey
Winter survival for many insect species includes a need to maintain metabolic homeostasis and structural/functional integrity of macromolecules not only over a wide range of cold temperatures but also in response to rapid temperature change. Chaperones are well-known to protect/stabilize protein structure with regard to heat stress but less is known about their potential involvement in long-term protection of the proteome at subzero temperatures. The present study assessed the participation of chaperone proteins in the cold hardiness of larvae of the goldenrod gall moth, Epiblema scudderiana (Clemens) (Lepidoptera, Olethreutidae), monitoring changes in nine proteins over the winter months as well as their responses to laboratory cold acclimation or anoxia exposure...
April 19, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28433711/mdh2-is-an-rna-binding-protein-involved-in-downregulation-of-sodium-channel-scn1a-expression-under-seizure-condition
#4
Yong-Hong Chen, Shu-Jing Liu, Mei-Mei Gao, Tao Zeng, Guo-Wang Lin, Na-Na Tan, Hui-Ling Tang, Ping Lu, Tao Su, Wei-Wen Sun, Long-Chang Xie, Yong-Hong Yi, Yue-Sheng Long
Voltage-gated sodium channel α-subunit type I (NaV1.1, encoded by SCN1A gene) plays a critical role in the excitability of brain. Downregulation of SCN1A expression is associated with epilepsy, a common neurological disorder characterized by recurrent seizures. Here we reveal a novel role of malate dehydrogenase 2 (MDH2) in the posttanscriptional regulation of SCN1A expression under seizure condition. We identified that MDH2 was an RNA binding protein that could bind two of the four conserved regions in the 3' UTRs of SCN1A...
April 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28433344/application-of-a-rapid-hilic-uv-method-for-synthesis-optimization-and-stability-studies-of-immunogenic-neo-glycoconjugates
#5
F Rinaldi, S Tengattini, E Calleri, T Bavaro, L Piubelli, L Pollegioni, G Massolini, C Temporini
Proteins and glycoproteins with therapeutic activity are susceptible to environmental factors, which can cause their degradation and the loss of their activity. Thus, the maintenance of their stability during the production process is a critical factor. In this work, a simple and rapid hydrophilic interaction liquid chromatography HILIC-UV method was validated in terms of accuracy, precision, linearity, LOD, LOQ and specificity and applied to the investigation of the stability of intact proteins and their neo-glycoconjugates with antigenic activity against tuberculosis...
March 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28433327/replacing-antibodies-with-modified-dna-aptamers-in-vaccine-potency-assays
#6
Jeremiah J Trausch, Mary Shank-Retzlaff, Thorsten Verch
Vaccine in vitro potency assays are vital regulatory tests that are used to confirm the presence and concentration of an antigen of interest in a form that directly or indirectly relates to protective activity in patients. Current assays come in many forms, but they almost exclusively use antibody reagents for selective detection of the target antigen. Antibodies provide specific recognition of vaccine antigens but also exhibit drawbacks such as stability limitations, cost, and lot-to-lot variation, which can make it challenging to maintain the reagent throughout the lifetime of the vaccine...
April 19, 2017: Vaccine
https://www.readbyqxmd.com/read/28433193/regulation-of-the-catalytic-behavior-of-pullulanases-chelated-onto-nickel-ii-modified-magnetic-nanoparticles
#7
Jianfeng Wang, Zhongmei Liu, Zhemin Zhou
Chelating of pullulanases onto nickel (II)-modified magnetic nanoparticles results in one-step purification and immobilization of pullulanase, and facilitates the commercial application of pullulanase in industrial scale. To improve the catalytic behavior, especially the operational stability, of the nanocatalyst in consecutive batch reactions, we prepared various iminodiacetic acid-modified magnetic nanoparticles differed in surface polarity and spacer length, on which the His6-tagged pullulanases were chelated via nickel ions, and then studied the correlation between the MNPs surface property and the corresponding catalyst behavior...
June 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28433149/fabrication-and-evaluation-of-thermosensitive-chitosan-collagen-%C3%AE-%C3%AE-glycerophosphate-hydrogels-for-tissue-regeneration
#8
Qifeng Dang, Kai Liu, Zhenzhen Zhang, Chengsheng Liu, Xi Liu, Ying Xin, Xiaoyu Cheng, Tao Xu, Dongsu Cha, Bing Fan
Thermosensitive hydrogels whose physiological properties are similar to extracellular matrix have been extensively used for tissue regeneration. Polysaccharides and proteins, as biocompatible substrates similar to bio-macromolecules that could be recognized by human body, are two preferred polymers for fabrication of such hydrogels. A series of novel thermosensitive hydrogels (CS-ASC-HGs) containing chitosan (CS) and acid-soluble collagen (ASC) were thus prepared, in the presence of α, β-glycerophosphate, to mimic extracellular microenvironment for tissue regeneration...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28433062/electrospun-nafion-polyacrylonitrile-nanofibers-as-an-ion-exchange-ultrathin-layer-chromatographic-stationary-phase
#9
Yanhui Wang, Susan V Olesik
An ion-exchange method to separate charged biomolecules on ultrathin layer chromatographic (UTLC) plates using electrospun Nafion-Polyacrylonitrile (PAN) nanofibers as the stationary phase is described. Sulfonate groups on Nafion provide the ion-exchange sites. The addition of PAN (a higher molecular weight polymer than Nafion) was used to facilitate the nanofiber formation process using electrospinning. Electrospinning parameters and separation conditions were optimized using fractional factorial design and response surface methodology...
June 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28432789/probing-protein-flexibility-reveals-a-mechanism-for-selective-promiscuity
#10
Nicolas A Pabon, Carlos J Camacho
Many eukaryotic regulatory proteins adopt distinct bound and unbound conformations, and use this structural flexibility to bind specifically to multiple partners. However, we lack an understanding of how an interface can select some ligands, but not others. Here, we present a molecular dynamics approach to identify and quantitatively evaluate the interactions responsible for this selective promiscuity. We apply this approach to the anti-cancer target PD-1 and its ligands PD-L1 and PD-L2. We discover that while unbound PD-1 exhibits a hard-to-drug hydrophilic interface, conserved specific triggers encoded in the cognate ligands activate a promiscuous binding pathway that reveals a flexible hydrophobic binding cavity...
April 22, 2017: ELife
https://www.readbyqxmd.com/read/28432544/expression-of-cphb-and-cphe-type-cyanophycinases-in-cyanophycin-producing-tobacco-and-comparison-of-their-ability-to-degrade-cyanophycin-in-plant-and-plant-extracts
#11
Daniel Ponndorf, Inge Broer, Henrik Nausch
Increasing the arginine (Arg) content in plants used as feed or food is of interest, since the supplementation of food with conditionally essential Arg has been shown to have nutritional benefits. An increase was achieved by the expression of the Arg-rich bacterial storage component, cyanophycin (CGP), in the chloroplast of transgenic plants. CGP is stable in plants and its degradation into β-aspartic acid (Asp)-Arg dipeptides, is solely catalyzed by bacterial cyanophycinases (CGPase). Dipeptides can be absorbed by animals even more efficiently than free amino acids (Matthews and Adibi 1976; Wenzel et al...
April 21, 2017: Transgenic Research
https://www.readbyqxmd.com/read/28432497/immobilization-of-ulp1-protease-on-nhs-activated-sepharose-a-useful-tool-for-cleavage-of-the-sumo-tag-of-recombinant-proteins
#12
Qiujin Liang, Zhengzhi Huang, Yuan Zhang, Hongtao Li
OBJECTIVE: To fabricate an active and stable enzyme through covalent immobilization, a Ubl-specific protease (Ulp1) was used to cleave small ubiquitin-like modifier (SUMO) fusion proteins. RESULTS: We immobilized Ulp1 on N-hydroxysuccinimide (NHS)-activated Sepharose with a coupling efficiency of 1.7 mg/ml. The immobilized Ulp1 maintains 95% substrate-cleavage ability and significantly enhances pH and thermal stability, especially can withstand pH of 10.5. Besides resistance against some small molecules, the immobilized Ulp1 can tolerate 15% (v/v) DMSO and 20% (v/v) ethanol...
April 21, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28432465/ppar%C3%AE-activation-regulates-lipid-droplet-formation-and-lactate-production-in-rat-sertoli-cells
#13
A Gorga, G M Rindone, M Regueira, E H Pellizzari, M C Camberos, S B Cigorraga, M F Riera, M N Galardo, S B Meroni
Sertoli cells provide the structural and nutritional support for germ cell development; they actively metabolize glucose and convert it to lactate, which is an important source of energy for germ cells. Furthermore, Sertoli cells can oxidize fatty acids, a metabolic process that is assumed to fulfill their own energy requirements. Fatty acids are stored as triacylglycerides within lipid droplets. The regulation of fatty acid storage in conjunction with the regulation of lactate production may thus be relevant to seminiferous tubule physiology...
April 21, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28432439/characterization-of-a-functional-recombinant-human-creatine-kinase-mb-isoenzyme-prepared-by-tandem-affinity-purification-from-escherichia-coli
#14
Lihui Zou, Wen Su, Meng Wang, Wei Huang, Haijian Zhao, Enyi Zhang, Junhua Jin, Hongtao Xu, Fei Xiao
Creatine kinase isoform CK-MB has been widely applied as a biomarker of myocardial injury. While a variety of methods have been used to measure CK-MB activity or mass in clinical laboratories, a CK-MB standard is needed to eliminate between-method bias. Because the in vitro expression of human creatine kinase generates three isoenzymes, CK-MM, CK-MB, and CK-BB, it is important to establish an effective method to purify the isoform CK-MB from the mixture. In this study, we aimed at using tandem affinity purification (TAP) to purify recombinant CK-MB protein and evaluate its value in clinical laboratories...
April 21, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28432329/affinity-biosensors-using-recombinant-native-membrane-proteins-displayed-on-exosomes-application-to-botulinum-neurotoxin-b-receptor
#15
Richard Desplantes, Christian Lévêque, Benjamin Muller, Manuela Lotierzo, Géraldine Ferracci, Michel Popoff, Michael Seagar, Robert Mamoun, Oussama El Far
The development of simple molecular assays with membrane protein receptors in a native conformation still represents a challenging task. Exosomes are extracellular vesicles which, due to their stability and small size, are suited for analysis in various assay formats. Here, we describe a novel approach to sort recombinant fully native and functional membrane proteins to exosomes using a targeting peptide. Specific binding of high affinity ligands to the potassium channel Kv1.2, the G-protein coupled receptor CXCR4, and the botulinum neurotoxin type B (BoNT/B) receptor, indicated their correct assembly and outside out orientation in exosomes...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432258/lil3-a-light-harvesting-complex-protein-links-terpenoid-and-tetrapyrrole-biosynthesis
#16
Daniel Hey, Maxi Rothbart, Josephine Herbst, Peng Wang, Jakob Müller, Daniel Wittmann, Kirsten Gruhl, Bernhard Grimm
LIL3 of Arabidopsis thaliana belongs to the light-harvesting complex (LHC) family, which also includes the light-harvesting chlorophyll-binding proteins of photosystems 1 and 2, the early-light-inducible proteins, PsbS involved in non-photochemical quenching, the one-helix-proteins and their cyanobacterial homologs designated high-light-inducible proteins. Each member of this family is characterized by one or two LHC transmembrane domains (referred to as the LHC motif) to which potential functions such as chlorophyll binding, protein interaction and integration of interacting partners into the plastid membranes have been attributed...
April 21, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28432084/topoisomerase2%C3%AE-and-thymidylate-synthase-expression-in-adrenocortical-cancer
#17
Elisa Roca, Alfredo Berruti, Silviu Sbiera, Ida Rapa, Ester Oneda, Paola Sperone, Cristina L Ronchi, Laura Ferrari, Salvatore Grisanti, Antonina Germano, Barbara Zaggia, Giorgio Scagliotti, Martin Fassnacht, Marco Volante, Massimo Terzolo, Mauro Papotti
Topoisomerase II alpha (TOP2A) and Thymidylate Synthase (TS) are known prognostic parameters in several tumors and also predictors of efficacy of anthracyclines, topoisomerase inhibitors and fluoropirimidines, respectively. Expression of TOP2A and TS mRNA was assessed in 98 patients with adrenocortical carcinoma (ACC) and protein expression was assessed by immunohistochemistry in a subset of 39 tumors. Ninety-two patients were radically resected for stage II-III disease and 38 of them received adjuvant mitotane...
April 21, 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/28431990/a-common-polymorphism-decreases-lrp1-mrna-stability-and-is-associated-with-increased-plasma-factor-viii-levels
#18
Jiann-Der Lee, Kuang-Ming Hsiao, Pey-Jium Chang, Chih-Cheng Chen, Ya-Wen Kuo, Yen-Chu Huang, Huan-Lin Hsu, Ya-Hui Lin, Chih-Ying Wu, Ying-Chih Huang, Meng Lee, Chia-Yu Hsu, Yi-Ting Pan, Chih-Yu Kuo, Chun-Hsien Lin
The low-density lipoprotein receptor-related protein 1 (LRP1) gene is associated with increased levels of plasma factor VIII (FVIII). We aimed to explore eight functional genetic LRP1 variants for their potential roles in regulating FVIII levels and acute ischemic stroke (AIS). This genetic association study enrolled 192 patients with AIS and 134 controls. There were no significant differences in the genetic frequency of the eight functional single-nucleotide polymorphisms (SNPs) between the control and AIS groups...
April 18, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28431929/effects-of-naturally-occurring-charged-mutations-on-the-structure-stability-and-binding-of-the-pin1-ww-domain
#19
Xiaoya Qiao, Ying Liu, Liting Luo, Lei Chen, Caixian Zhao, Xuanjun Ai
Pin1 is a peptidyl-prolyl cis-trans isomerase, whose WW domain specifically recognizes the pSer/Thr-Pro motif. Pin1 is involved in multiple phosphorylation events that regulate the activities of various substrates, and Pin1 deregulation has been reported in various diseases, including cancer and Alzheimer's disease. The WW domain of Pin1 has been used as a small model protein to investigate the folding mechanisms of the β-sheet structure by studying the effect of mutations or its naturally occurring variants...
April 19, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28431398/decreased-calpain-activity-in-chronic-myeloid-leukemia-impairs-apoptosis-by-increasing-survivin-in-myeloid-progenitors-and-xiap1-in-differentiating-granulocytes
#20
Weiqi Huang, Ling Bei, Elizabeth E Hjort, Elizabeth A Eklund
Chronic Myeloid Leukemia (CML) is characterized by translocations between chromosomes 9 and 22, resulting in expression of Bcr-abl oncogenes. Although the clinical course of CML was revolutionized by development of Bcr-abl-directed tyrosine kinase inhibitors (TKIs), CML is not cured by these agents. Specifically, the majority of subjects relapsed in clinical trials attempting TKI discontinuation, suggesting persistence of leukemia stem cells (LSCs) even in molecular remission. Identifying mechanisms of CML-LSC persistence may suggest rationale therapeutic targets to augment TKI efficacy and lead to cure...
April 6, 2017: Oncotarget
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