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781.
Guilherme M. Silva Rosivaldo S. Borges Kelton L. B. Santos Leonardo B. Federico Isaque A. G. Francischini Suzane Q. Gomes Mariana P. Barcelos Rai C. Silva Cleydson B. R. Santos Carlos H. T. P. Silva 《International journal of molecular sciences》2021,22(15)
Glycogen synthase kinase-3 beta (GSK-3β) is an enzyme pertinently linked to neurodegenerative diseases since it is associated with the regulation of key neuropathological features in the central nervous system. Among the different kinds of inhibitors of this kinase, the allosteric ones stand out due to their selective and subtle modulation, lowering the chance of producing side effects. The mechanism of GSK-3β allosteric modulators may be considered still vague in terms of elucidating a well-defined binding pocket and a bioactive pose for them. In this context, we propose to reinvestigate and reinforce such knowledge by the application of an extensive set of in silico methodologies, such as cavity detection, ligand 3D shape analysis and docking (with robust validation of corresponding protocols), and molecular dynamics. The results here obtained were consensually consistent in furnishing new structural data, in particular by providing a solid bioactive pose of one of the most representative GSK-3β allosteric modulators. We further applied this to the prospect for new compounds by ligand-based virtual screening and analyzed the potential of the two obtained virtual hits by quantum chemical calculations. All potential hits achieved will be subsequently tested by in vitro assays in order to validate our approaches as well as to unveil novel chemical entities as GSK-3β allosteric modulators. 相似文献
782.
Mariana PeredaGuillermina Amica Ilona RáczNorma E. Marcovich 《Journal of food engineering》2011,103(1):76-83
Films made from sodium caseinate and nanocellulose were prepared by dispersing the fibrils into film forming solutions, casting and drying. Composite films were less transparent and had a more hydrophilic surface than neat sodium caseinate ones. However, the global moisture uptake was almost not affected by filler concentration. Addition of nanocellulose to the neat sodium caseinate films produced an initial increase in the barrier properties to water vapor, and then, it decreases as filler content increased. This was explained in terms of additional detrimental changes (cracks and bubble formation) induced in the morphological structure of the film by the reinforcement.The tensile modulus and strength of composite films increased significantly with increasing cellulose concentrations, while the values of elongation decreased. In the same way it was found that the storage modulus increases considerably with filler addition in the low temperature range (<60 °C), though the effect of temperature on the films performance is even more dramatic, as expected in protein-based materials. 相似文献
783.
The viscoelasticity and microstructure of mixtures of cross-linked waxy maize starch (CH10), whey protein isolate (WPI) and κ-carrageenan (κC) at pH 7.0 with 100 mM NaCl were investigated by oscillatory rheometry and confocal laser scanning microscopy (CLSM). Mixtures were heated to 90 °C (1.5 °C/min), held for 10 min at this temperature and cooled. Within the range of concentrations studied, CH10 swollen granules reinforced WPI and κC networks. The mechanical behavior of the three-component mixtures was modified by different WPI concentrations, but κC governed the overall response due to its gelling ability. CLSM images of three-component mixtures showed particulate systems in which swollen starch granules are surrounded by κC and WPI. CH10 granules were immersed in a single phase and a separate phase of κC and WPI, for low and high concentrations of these components, respectively. Therefore, it is possible to obtain two- and three-phase mixtures. 相似文献
784.
Pavel A. Melentev Elena V. Ryabova Nina V. Surina Darya R. Zhmujdina Artem E. Komissarov Ekaterina A. Ivanova Natalia P. Boltneva Galina F. Makhaeva Mariana I. Sliusarenko Andriy S. Yatsenko Iryna I. Mohylyak Nataliya P. Matiytsiv Halyna R. Shcherbata Svetlana V. Sarantseva 《International journal of molecular sciences》2021,22(15)
Various neurodegenerative disorders are associated with human NTE/PNPLA6 dysfunction. Mechanisms of neuropathogenesis in these diseases are far from clearly elucidated. Hereditary spastic paraplegia belongs to a type of neurodegeneration associated with NTE/PNLPLA6 and is implicated in neuron death. In this study, we used Drosophila melanogaster to investigate the consequences of neuronal knockdown of swiss cheese (sws)—the evolutionarily conserved ortholog of human NTE/PNPLA6—in vivo. Adult flies with the knockdown show longevity decline, locomotor and memory deficits, severe neurodegeneration progression in the brain, reactive oxygen species level acceleration, mitochondria abnormalities and lipid droplet accumulation. Our results suggest that SWS/NTE/PNPLA6 dysfunction in neurons induces oxidative stress and lipid metabolism alterations, involving mitochondria dynamics and lipid droplet turnover in neurodegeneration pathogenesis. We propose that there is a complex mechanism in neurological diseases such as hereditary spastic paraplegia, which includes a stress reaction, engaging mitochondria, lipid droplets and endoplasmic reticulum interplay. 相似文献
785.
Effect of combined treatment of hydrolysis and polymerization with transglutaminase on β-lactoglobulin antigenicity 总被引:1,自引:0,他引:1
Isabele Serimarco Sabadin Mariana Battaglin Villas-Boas Ricardo de Lima Zollner Flavia Maria Netto 《European Food Research and Technology》2012,235(5):801-809
The effect of combined treatments of hydrolysis with different proteases, and subsequent polymerization with transglutaminase on the antigenic activity of β-Lg was studied. For the hydrolysis of β-Lg using Alcalase, Neutrase or bromelain, the reaction conditions were 3?% β-Lg and enzyme:substrate 25?U?g?1 of protein, as was defined using factorial study. Under these conditions, the degree of hydrolysis (DH) of the hydrolysates was 12.6?% when obtained with Alcalase and approximately 4?% with Neutrase or bromelain. Post-hydrolysis polymerization did not result in an increase in molecular mass of the protein, but these samples presented a lower DH, determined by trinitrobenzenosulfonic acid (TNBS) method, suggesting that polymerization had occurred. Hydrolysis with the three enzymes reduced the β-Lg antigenicity, as evaluated by ELISA and immunoblotting analyses. The IgE-binding responses were practically null (<9?μg?mL?1), 22.82 and 55.73?μg?mL?1 towards the hydrolysates obtained with Alcalase, bromelain, and Neutrase, respectively. The post-hydrolysis polymerization increased or had no significant effect (P?≥?0.05) on the antigenic response of the hydrolysates. 相似文献
786.
787.
The effect of nitrate, Fe(III) and bicarbonate on the degradation of bisphenol A by simulated solar UV-irradiation 总被引:3,自引:1,他引:2
The photoinitiated degradation of bisphenol A (BPA, 520 micromol/L) was investigated using a solar simulator in the absence/presence of NO(3)(-), Fe(III), and HCO(3)(-). The concentrations of NO(3)(-), Fe(III), and HCO(3)(-) were 0-160, 0-10, and 0-820 micromol/L, respectively, and were chosen to simulate a natural aquatic environment. The experimental region was explored using a Box-Behnken design for three factors, extended to experimentally include all eight possible combinations of presence/absence of the factors studied. The results show that, after 7h of irradiation, photolysis occurs only to a minimal degree (2%) in the absence of NO(3)(-) and HCO(3)(-). Increasing the concentration of NO(3)(-) and HCO(3)(-) gives rise to up to 24% degradation after 7h of irradiation. The concentration of Fe(III) was found to play no active role under the conditions studied. A simple linear model is given that very well describes the results obtained. 相似文献
788.
One of the biggest challenges in neuro-oncology is understanding the complexity of central nervous system tumors, such as gliomas, in order to develop suitable therapeutics. Conventional therapies in malignant gliomas reconcile surgery and radiotherapy with the use of chemotherapeutic options such as temozolomide, chloroethyl nitrosoureas and the combination therapy of procarbazine, lomustine and vincristine. With the unraveling of deregulated cancer cell signaling pathways, targeted therapies have been developed. The most affected signaling pathways in glioma cells involve tyrosine kinase receptors and their downstream pathways, such as the phosphatidylinositol 3-kinases (PI3K/AKT/mTOR) and mitogen-activated protein kinase pathways (MAPK). MAPK pathway inhibitors include farnesyl transferase inhibitors, Ras kinase inhibitors and mitogen-activated protein extracellular regulated kinase (MEK) inhibitors, while PI3K/AKT/mTOR pathway inhibitors are divided into pan-inhibitors, PI3K/mTOR dual inhibitors and AKT inhibitors. The relevance of the immune system in carcinogenesis has led to the development of immunotherapy, through vaccination, blocking of immune checkpoints, oncolytic viruses, and adoptive immunotherapy using chimeric antigen receptor T cells. In this article we provide a comprehensive review of the signaling pathways underlying malignant transformation, the therapies currently used in the treatment of malignant gliomas and further explore therapies under development, including several ongoing clinical trials. 相似文献
789.
Josemar Gonalves Oliveira Filho Mariana Buranelo Egea 《International journal of molecular sciences》2022,23(10)
Edible packaging has been developed as a biodegradable and non-toxic alternative to traditional petroleum-based food packaging. Biopolymeric edible films, in addition to their passive protective function, may also play a bioactive role as vehicles for bioactive compounds of importance to human health. In recent years, a new generation of edible food packaging has been developed to incorporate ingredients with functional potential that have beneficial effects on consumer health. Curcumin, a bioactive compound widely used as a natural dye obtained from turmeric rhizomes (Curcuma longa L.), has a broad spectrum of beneficial properties for human health, such as anti-inflammatory, anti-hypertensive, antioxidant, anti-cancer, and other activities. To demonstrate these properties, curcumin has been explored as a bioactive agent for the development of bioactive packaging, which can be referred to as functional packaging and used in food. The aim of this review was to describe the current and potential research on the development of functional-edible-films incorporating curcumin for applications such as food packaging. 相似文献
790.
Anca-Roxana Petrovici Mihaela Silion Natalia Simionescu Rami Kallala Mariana Pinteala Stelian S. Maier 《International journal of molecular sciences》2022,23(11)
Zoledronic acid (ZA) is used in the treatment of various bone pathologies, but it forms complexes with calcium ions present in body fluids, decreasing ZA bioavailability. Thereby, the study first describes the identification of ZA-calcium complexes that form in calcium-rich environments, in order to establish the bioavailable ZA concentration. Then, a new method for quantification of low ZA amounts in milieus that mimics in vivo conditions by using simulated body fluid and calcium sulfate hemihydrate was described. Almost all analytical methods of ZA quantification described in the literature require compound derivatization. At very low concentrations, derivatization is prone to analyte loss, therefore compromising the analytical results. In our study, we avoided ZA derivatization by using a high-performance liquid chromatography and electrospray ionization mass spectrometry (HPLC-ESI-MS) system, conducting the investigation based on the fragmentation mass extracted ion chromatograms specific to the ZA protonated form. The method was validated by selectivity, precision, accuracy, linearity, signal to noise ratio, and limit of detection and limit of quantification calculation. Experimentally, this method can detect ranges of 0.1–0.5 ng/mL and precisely quantify ZA concentrations as low as 0.1 ng/mL. This method could provide the basis for quantifying low amounts of ZA in the blood during long-term administration. 相似文献