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https://www.readbyqxmd.com/read/28092406/llfh1-mediated-interaction-between-actin-fringe-and-exocytic-vesicles-is-involved-in-pollen-tube-tip-growth
#1
Shanwei Li, Huaijian Dong, Weike Pei, Chaonan Liu, Sha Zhang, Tiantian Sun, Xiuhua Xue, Haiyun Ren
Pollen tube tip growth is an extreme form of polarized cell growth, which requires polarized exocytosis based on a dynamic actin cytoskeleton. However, the molecular basis for the connection between actin filaments and exocytic vesicles is unclear. Here, we identified a Lilium longiflorum pollen-specific formin (LlFH1) and found that it localized at the apical vesicles and plasma membrane (PM). Overexpression of LlFH1 induced excessive actin cables in the tube tip region, and downregulation of LlFH1 eliminated the actin fringe...
January 16, 2017: New Phytologist
https://www.readbyqxmd.com/read/28088731/biological-properties-of-citral-and-its-potential-protective-effects-against-cytotoxicity-caused-by-aspirin-in-the-iec-6-cells
#2
Hafsia Bouzenna, Najla Hfaiedh, Marie-Agnès Giroux-Metges, Abdelfattah Elfeki, Hélène Talarmin
Citral, 3,7-dimethyl-2,6-octadienal, is a key component of several essential oils extracted from lemon-scented herbal plants. The present study was designed to investigate the antioxidant activities of citral and assess its possible protective effects against aspirin-induced toxicity in vitro. We used IEC-6 cells (rat small intestine epithelial cells). The antioxidant activities were determined by 1,1-diphenyl-2-picrylhydrazyl (DPPH), β-carotene/linoleic acid and Ferric reducing antioxidant power (FRAP). Cytotoxicity was evaluated by cell viability, anti-oxidant enzyme activities, malondialdehyde (MDA) production and by the expression of MAPKs (Mitogen-Activated Protein Kinases) pathways...
January 12, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28077322/a-protein-kinase-a-ezrin-complex-regulates-connexin-43-gap-junction-communication-in-liver-epithelial-cells
#3
Aleksandra Dukic, Linda Hofstad Haugen, Guillaume Pidoux, Edward Leithe, Oddmund Bakke, Kjetil Taskén
Communication between adjacent cells can occur via gap junctions (GJ) composed of connexin (Cx) hexamers that allow passage of small molecules. One of the most widely and highly expressed Cxs in human tissues is Cx43, shown to be regulated through phosphorylation by several kinases including PKA. Ezrin is a membrane associated protein that can serve as an A kinase anchoring protein (AKAP) and hold an anchored pool of PKA. Here, we used the liver epithelial cell line IAR20, which expresses Cx43 as the predominant GJ protein, to test the hypothesis that Ezrin may associate with Cx43 in cell types that form stable GJs and serve as an AKAP...
January 7, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28075574/visualization-of-mycobacterial-membrane-dynamics-in-live-cells
#4
Frances P Rodriguez-Rivera, Xiaoxue Zhou, Julie A Theriot, Carolyn R Bertozzi
Mycobacteria are endowed with a highly impermeable mycomembrane that confers intrinsic resistance to many antibiotics. Several unique mycomembrane glycolipids have been isolated and structurally characterized, but the underlying organization and dynamics of glycolipids within the cell envelope remain poorly understood. We report here a study of mycomembrane dynamics that was enabled by trehalose-fluorophore conjugates capable of labeling trehalose glycolipids in live actinomycetes. We identified fluorescein-trehalose analogs that are metabolically incorporated into the trehalose mycolates of representative Mycobacterium, Corynebacterium, Nocardia and Rhodococcus species...
January 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28071019/influence-of-different-extraction-conditions-on-antioxidant-properties-of-soursop-peel
#5
Wei Zin Lee, Sui Kiat Chang, Hock Eng Khoo, Chiaw Mei Sia, Hip Seng Yim
BACKGROUND: Soursop is a healthy fruit. Peels form about 20% of the soursop fruit and are usually discarded as waste product. With a view to utilizing soursop peel as a source of valuable compounds, this study aimed to investigate the influence of different extraction conditions on total phenolic content (TPC) and antioxidant capacity (AC) of soursop (Annona muricata L.) peel. METHODS: Different ethanol concentrations (20-100%, v/v), extraction temperatures (25- 60°C), and extraction time (1-5 h) were tested...
October 2016: Acta Scientiarum Polonorum. Technologia Alimentaria
https://www.readbyqxmd.com/read/28071017/evaluation-of-the-potential-use-of-probiotic-strain-lactobacillus-plantarum-299v-in-lactic-fermentation-of-button-mushroom-fruiting-bodies
#6
Ewa Jabłońska-Ryś, Aneta Sławińska, Wojciech Radzki, Waldemar Gustaw
BACKGROUND: The available literature does not provide data on the application of probiotic strains in mushroom processing. The aim of the study was to evaluate the potential to use the L. plantarum 299v strain with documented probiotic properties in the process of lactic fermentation of button mushroom fruiting bodies (Agaricus bisporus). METHODS: Fresh button mushroom fruiting bodies and cultures of lactic acid bacteria L. plantarum Ib and a probiotic strain L...
October 2016: Acta Scientiarum Polonorum. Technologia Alimentaria
https://www.readbyqxmd.com/read/28069951/calsequestrin-depolymerizes-when-calcium-is-depleted-in-the-sarcoplasmic-reticulum-of-working-muscle
#7
Carlo Manno, Lourdes C Figueroa, Dirk Gillespie, Robert Fitts, ChulHee Kang, Clara Franzini-Armstrong, Eduardo Rios
Calsequestrin, the only known protein with cyclical storage and supply of calcium as main role, is proposed to have other functions, which remain unproven. Voluntary movement and the heart beat require this calcium flow to be massive and fast. How does calsequestrin do it? To bind large amounts of calcium in vitro, calsequestrin must polymerize and then depolymerize to release it. Does this rule apply inside the sarcoplasmic reticulum (SR) of a working cell? We answered using fluorescently tagged calsequestrin expressed in muscles of mice...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28067840/effect-of-film-forming-alginate-chitosan-polyelectrolyte-complex-on-the-storage-quality-of-pork
#8
Dominika Kulig, Anna Zimoch-Korzycka, Żaneta Król, Maciej Oziembłowski, Andrzej Jarmoluk
Meat is one of the most challenging food products in the context of maintaining quality and safety. The aim of this work was to improve the quality of raw/cooked meat by coating it with sodium alginate (A), chitosan (C), and sodium alginate-chitosan polyelectrolyte complex (PEC) hydrosols. Antioxidant properties of A, C, and PEC hydrosols were determined. Subsequently, total antioxidant capacity (TAC), sensory quality of raw/cooked pork coated with experimental hydrosols, and antimicrobial efficiency of those hydrosols on the surface microbiota were analysed...
January 6, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28065315/nuclear-displacement-and-fluorescence-recovery-after-photobleaching-frap-assays-to-study-division-site-placement-and-cytokinesis-in-fission-yeast
#9
P Ullal, P Bhatia, S G Martin
Cytokinesis is an essential cellular event that completes the cell division cycle. It begins with the assembly of an actomyosin contractile ring that undergoes constriction concomitant with the septum formation to divide the cell in two. Placement of the septum at the right position is important to ensure fidelity of the division process. In fission yeast, the medially placed nucleus is a major spatial cue to position the site of division. In this chapter, we describe a simple synthetic biology-based approach to displace the nucleus and study the consequence on division site positioning...
2017: Methods in Cell Biology
https://www.readbyqxmd.com/read/28062848/the-spectraplakin-short-stop-is-an-essential-microtubule-regulator-involved-in-epithelial-closure-in-drosophila
#10
Zsanett Takács, Ferenc Jankovics, Péter Vilmos, Péter Lénárt, Katja Röper, Miklós Erdélyi
Dorsal closure of the Drosophila embryonic epithelium provides an excellent model system for the in vivo analysis of molecular mechanisms regulating cytoskeletal rearrangements. We investigated the function of the Drosophila spectraplakin Short stop (Shot), a conserved cytoskeletal structural protein, during closure of the dorsal embryonic epithelium.In this study, we show that Shot is essential for the efficient final zippering of the opposing epithelial margins. Using isoform-specific mutant alleles and genetic rescue experiments with truncated Shot variants, we demonstrate that Shot functions as an actin-microtubule cross-linker in mediating zippering...
January 6, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28062602/methods-used-to-study-the-oligomeric-structure-of-g-protein-coupled-receptors
#11
Hui Guo, Su An, Richard J Ward, Yang Yang, Ying Liu, Xiao-Xi Guo, Qian Hao, Tian-Rui Xu
G-protein coupled receptors (GPCRs), which constitute the largest family of cell surface receptors, were originally thought to function as monomers, but are now recognized as being able to act in a wide range of oligomeric states and indeed, it is known that the oligomerization state of a GPCR can modulate its pharmacology and function. A number of experimental techniques have been devised to study GPCR oligomerization including those based upon traditional biochemistry such as blue-native polyacrylamide gel-electrophoresis (BN-PAGE), co-immunoprecipitation and protein-fragment complementation assays, those based upon resonance energy transfer, fluorescence resonance energy transfer (FRET), time-resolved FRET, FRET spectrometry and bioluminescence resonance energy transfer (BRET)...
January 6, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28060509/establishment-of-a-physical-model-for-solute-diffusion-in-hydrogel-understanding-the-diffusion-of-proteins-in-poly-sulfobetaine-methacrylate-hydrogel
#12
Yuhang Zhou, Junjie Li, Ying Zhang, Dianyu Dong, Ershuai Zhang, Feng Ji, Zhihui Qin, Jun Yang, Fanglian Yao
The prediction of the diffusion coefficient of solute, especially bioactive molecules, in hydrogel is significant in biomedical field. Considering the randomness of solute movement in hydrogel network, a physical diffusion RMP-1 model based on obstruction theory was established in this study. Based on this, the physical properties of the solute and polymer chain and the interactions between them were introduced into this model, RMP-2 and RMP-3 model were established to understand and predict the diffusion behaviors of proteins in hydrogel...
January 6, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28057373/effects-of-the-amendment-of-biochars-and-carbon-nanotubes-on-the-bioavailability-of-hexabromocyclododecanes-hbcds-in-soil-to-ecologically-different-species-of-earthworms
#13
Bing Li, Hongkai Zhu, Hongwen Sun, Jiayao Xu
Biochar is a promising material used in soil amendment and carbon nanotubes may enter soil due to its increasing application. These carbonaceous materials may change the bioavailability of pollutants in soil. In this concern, 0.5% w/w multi-walled carbon nanotubes (MWCNTs) and 3 corn-straw biochars acquired at different pyrolyzing temperatures were used in soil amendment and their influences on the bioavailability of hexabromocyclododecanes (HBCDs), a brominated flame retardant, to 2 ecologically different earthworm species were studied...
January 2, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28053569/synthesis-of-n-mannich-bases-of-berberine-linking-piperazine-moieties-revealing-anticancer-and-antioxidant-effects
#14
Bhupendra Mistry, Rahul V Patel, Young-Soo Keum, Doo Hwan Kim
A new Mannich base series of piperazine linked berberine analogues was furnished in this study to screen the antioxidant and anticancer potential of the resultant analogues. Alkoxy group at a C-9 position of berberine was converted to hydroxyl functionality to enhance the ability of final scaffolds binding to the target of drug action mainly through hydrophobic effect, conjugation effect, whereas Mannich base functionality was introduced on the C-12 position of berberine. Scaffolds were investigated for their free radical scavenging antioxidant potential in FRAP and DPPH assay, whereas tested to check their Fe(+3) reducing power in ABTS assay...
January 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28052115/lipid-bilayers-are-long-lived-on-solvent-cleaned-plasma-oxidized-poly-dimethyl-siloxane-ox-pdms
#15
K M Rifat Faysal, June S Park, Jonny Nguyen, Luis Garcia, Anand Bala Subramaniam
Although it is well known that phospholipids self-assemble on hydrophilic plasma-oxidized PMDS surfaces (ox-PDMS) to form cell membrane mimetic bilayers, the temporal stability of phospholipid membranes on these surfaces is unknown. Here we report that phospholipid bilayers remain stable on solvent-cleaned ox-PDMS for at least 132 hours after preparation. Absent solvent cleaning, the bilayers were stable for only 36 hours. We characterized the phospholipid bilayers, i) through quantitative comparative analysis of the fluorescence intensity of phospholipid bilayers on ox-PDMS and phospholipid monolayers on native PDMS and, ii) through measurements of the diffusive mobility of the lipids through fluorescence recovery after photobleaching (FRAP)...
2017: PloS One
https://www.readbyqxmd.com/read/28049535/gaultheria-trichophylla-royle-a-source-of-minerals-and-biologically-active-molecules-its-antioxidant-and-anti-lipoxygenase-activities
#16
Fiaz Alam, Qazi Najam Us Saqib, Mohammad Ashraf
BACKGROUND: Gaultheria trichophylla (Royle) is used as food and for treating many ailments in folk medicine especially against inflammation. The purpose of this in vitro study was to evaluate the ability of extracts of G. trichophylla as anti-oxidant and anti-inflammatory agent and for its mineral contents. METHODS: Powdered plant material (100 g) was extracted with 100 ml each of methanol, chloroform, and n-hexane using soxhlet extractor. Antioxidant activity of methanol extract was assessed by DPPH radical scavenging and FRAP assays...
January 3, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28049144/molecular-diffusion-through-cyanobacterial-septal-junctions
#17
Mercedes Nieves-Morión, Conrad W Mullineaux, Enrique Flores
: Heterocyst-forming cyanobacteria grow as filaments in which intercellular molecular exchange takes place. During the differentiation of N2-fixing heterocysts, regulators are transferred between cells. In the diazotrophic filament, vegetative cells that fix CO2 through oxygenic photosynthesis provide the heterocysts with reduced carbon and heterocysts provide the vegetative cells with fixed nitrogen. Intercellular molecular transfer has been traced with fluorescent markers, including calcein, 5-carboxyfluorescein, and the sucrose analogue esculin, which are observed to move down their concentration gradient...
January 3, 2017: MBio
https://www.readbyqxmd.com/read/28049060/a-comparative-study-of-the-dynamic-accumulation-of-polyphenol-components-and-the-changes-in-their-antioxidant-activities-in-diploid-and-tetraploid-lonicera-japonica
#18
Dexin Kong, Yanqun Li, Mei Bai, Yali Deng, Guangxin Liang, Hong Wu
Polyploidization is an effective method to achieve a higher yield of secondary metabolism active ingredients in medicinal plants. Polyphenols are the main active substances that contribute to the antioxidant activity of Lonicera japonica. For studying on the effect of chromosome doubling and harvest time on the dynamic accumulation of the main active substances and antioxidant capabilities of L. japonica, the polyphenol composition contents (7 phenolic acids and 3 flavonoids) and the antioxidant capacity in buds and flowers of diploid and tetraploid L...
December 28, 2016: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28040469/the-chilean-superfruit-black-berry-aristotelia-chilensis-elaeocarpaceae-maqui-as-mediator-in-inflammation-associated-disorders
#19
Carlos L Cespedes, Natalia Pavon, Mariana Dominguez, Julio Alarcon, Cristian Balbontin, Isao Kubo, Mohammed El-Hafidi, Jose G Avila
The effects of phytochemicals occurred in fractions and extracts of fruits of "Maqui-berry" (Aristotelia chilensis), on the expression of cyclooxygenase-2 (COX-2), inducible-nitric oxide synthases (iNOS) and the production of proinflammatory mediators were investigated in lipopolysaccharide (LPS)-activated murine macrophage RAW-264 cells, as well as their antioxidant activities. The MeOH extract (A), acetone/methanol extract (B), fractions F3, F4, subfractions (SF4-SF6, SF7, SF8-SF10, SF11-SF15, SF16-SF20), quercetin, gallic acid, luteolin, myricetin, mixtures M1, M2 and M3 exhibited potent anti-inflammatory and antioxidant activities...
December 28, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28036089/chemical-composition-and-antioxidant-activity-of-euterpe-oleracea-roots-and-leaflets
#20
Christel Brunschwig, Louis-Jérôme Leba, Mona Saout, Karine Martial, Didier Bereau, Jean-Charles Robinson
Euterpe oleracea (açaí) is a palm tree well known for the high antioxidant activity of its berries used as dietary supplements. Little is known about the biological activity and the composition of its vegetative organs. The objective of this study was to investigate the antioxidant activity of root and leaflet extracts of Euterpe oleracea (E. oleracea) and characterize their phytochemicals. E. oleracea roots and leaflets extracts were screened in different chemical antioxidant assays (DPPH-2,2-diphenyl-1-picrylhydrazyl, FRAP-ferric feducing antioxidant power, and ORAC-oxygen radical absorbance capacity), in a DNA nicking assay and in a cellular antioxidant activity assay...
December 29, 2016: International Journal of Molecular Sciences
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