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https://www.readbyqxmd.com/read/28935104/syntheses-of-fluorescent-gangliosides-for-the-studies-of-raft-domains
#1
Naoko Komura, Kenichi G N Suzuki, Hiromune Ando, Miku Konishi, Akihiro Imamura, Hideharu Ishida, Akihiro Kusumi, Makoto Kiso
Gangliosides, glycosphingolipids containing one or more sialic acids in the glycan chain, are involved in various important biological processes in cell plasma membranes (PMs). However, the behaviors and functions of gangliosides are poorly understood, primarily because of the lack of fluorescent analogs that are equivalent to native gangliosides that can be used as chemical and physical probes. In this study, we developed entirely chemical methods to synthesize fluorescent gangliosides (GM3, GM2, GM1, and GD1b) in which the glycan components are site-specifically labeled with various fluorescent dyes...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28922156/soluble-oligomers-require-a-ganglioside-to-trigger-neuronal-calcium-overload
#2
Roberta Cascella, Elisa Evangelisti, Alessandra Bigi, Matteo Becatti, Claudia Fiorillo, Massimo Stefani, Fabrizio Chiti, Cristina Cecchi
An altered distribution of membrane gangliosides (GM), including GM1, has recently been reported in the brains of Alzheimer's disease (AD) patients. Moreover, amyloid-positive synaptosomes obtained from AD brains were found to contain high-density GM1 clusters, suggesting a pathological significance of GM1 increase at presynaptic neuritic terminals in AD. Here, we show that membrane GM1 specifically recruits small soluble oligomers of the 42-residue form of amyloid-β peptide (Aβ42), with intracellular flux of Ca2+ ions in primary rat hippocampal neurons and in human neuroblastoma cells...
September 8, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28905402/affinity-capillary-electrophoresis-for-the-assessment-of-binding-affinity-of-carbohydrate-based-cholera-toxin-inhibitors
#3
Oier Aizpurua-Olaizola, Javier Sastre Torano, Aliaksei Pukin, Ou Fu, Geert Jan Boons, Gerhardus J de Jong, Roland J Pieters
Developing tools for the study of protein carbohydrate interactions is an important goal in glycobiology. Cholera toxin inhibition is an interesting target in this context, as its inhibition may help the fight against cholera. For the study of novel ligands an affinity capillary electrophoresis (ACE) method was optimised and applied. The method uses unlabeled cholera toxin B-subunit (CTB) and unlabeled carbohydrate ligands based on ganglioside GM1-oligosaccharides (GM1os). In an optimized method at pH 4, adsorption of the protein to the capillary walls was prevented by a polybrene-dextran sulfate-polybrene (PB-DS-PB) coating...
September 14, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28894900/interaction-between-luteinizing-hormone-releasing-hormone-and-gm1-doped-cholesterol-sphingomyelin-vesicles-a-spectroscopic-study
#4
Zarrin Shahzadi, Chaitali Mukhopadhyay
Understanding the role of neural membrane in translocation and action of neurohormone is of great importance. Luteinizing hormone-releasing hormone (LHRH) is a neuropeptide hormone and it acts as a final signaling molecule by stimulating the synthesis of LH and FSH to maintain reproduction in all vertebrates. The receptors of LHRH are found in breast tumors and pituitary gland in the brain. Moreover, neural plasma membrane is also found to contain specific binding site for LHRH. The mechanism by which LHRH binds to membrane before it binds to the receptors is a very critical step and can have a profound impact upon the translation of peptide across the membrane...
September 11, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/28893064/aqueous-raft-synthesis-of-glycopolymers-for-determination-of-saccharide-structure-and-concentration-effects-on-amyloid-%C3%AE-aggregation
#5
Pradipta Kumar Das, Dexter N Dean, April L Fogel, Fei Liu, Brooks A Abel, Charles L McCormick, Eugenia Kharlampieva, Vijayaraghavan Rangachari, Sarah E Morgan
GM1 ganglioside is known to promote amyloid-β (Aβ) peptide aggregation in Alzheimer's disease. The roles of the individual saccharides and their distribution in this process are not understood. Acrylamide-based glycomonomers with either β-D-glucose or β-D-galactose pendant groups were synthesized to mimic the stereochemistry of saccharides present in GM1 and characterized via 1H NMR and electrospray ionization mass spectrometry. Glycopolymers of different molecular weights were synthesized by aqueous reversible addition fragmentation chain transfer (aRAFT) polymerization and characterized by NMR and GPC...
September 11, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28882894/zinc-oxide-nanoparticles-provide-anti-cholera-activity-by-disrupting-the-interaction-of-cholera-toxin-with-the-human-gm1-receptor
#6
Shamila Sarwar, Asif Ali, Mahadeb Pal, Pinak Chakrabarti
Vibrio cholerae causes cholera and is the leading cause of diarrhea in the developing countries, highlighting the need for the development of new treatment strategies to combat this disease agent. While exploring the possibility of using zinc oxide (ZnO) nanoparticles (NPs) in cholera treatment, we previously found that ZnO NPs reduce fluid accumulation in mouse ileum induced by the cholera toxin (CT) protein. To uncover the mechanism of action of ZnO NPs on CT activity, here we used classical (O395) and El Tor (C6706) V...
September 7, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28879940/isolated-globus-pallidi-hypointensities-in-type-2-gm1-gangliosidoses
#7
Mahesh Kamate, Nishant Mittal
No abstract text is available yet for this article.
September 2017: Neurology India
https://www.readbyqxmd.com/read/28879885/anti-ganglioside-antibodies-profile-in-guillain-barr%C3%A3-syndrome-correlation-with-clinical-features-electrophysiological-pattern-and-outcome
#8
G Sivaram Naik, A Kanikannan Meena, B Ashok Kumar Reddy, Rukmini K Mridula, Shaik A Jabeen, Rupam Borgohain
BACKGROUND: Guillain-Barré syndrome (GBS) and its subtypes are associated with distinct anti-ganglioside antibodies. Hence, we aimed to determine the frequency of anti-ganglioside antibodies and its correlation with clinical features, electrophysiological patterns, and outcome in patients with GBS. MATERIAL AND METHODS: The data regarding clinical features, electrophysiological patterns, and outcome at 6 months were collected and analyzed from the case records of patients diagnosed with GBS during 2008-2013 at a tertiary care hospital in south India...
September 2017: Neurology India
https://www.readbyqxmd.com/read/28844949/role-of-membrane-gm1-on-early-neuronal-membrane-actions-of-a%C3%AE-during-onset-of-alzheimer-s-disease
#9
E J Fernández-Pérez, F J Sepúlveda, R Peoples, Luis G Aguayo
The ability of beta-amyloid peptide (Aβ) to disrupt the plasma membrane through formation of pores and membrane breakage has been previously described. However, the molecular determinants for these effects are largely unknown. In this study, we examined if the association and subsequent membrane perforation induced by Aβ was dependent on GM1 levels. Pretreatment of hippocampal neurons with D-PDMP decreased GM1 and Aβ clustering at the membrane (Aβ fluorescent-punctas/20μm, control=16.2±1.1 vs. D-PDMP =6...
August 24, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28844489/analysis-of-lipid-raft-molecules-in-the-living-brain-slices
#10
Norihiro Kotani, Takanari Nakano, Yui Ida, Rina Ito, Miki Hashizume, Arisa Yamaguchi, Makoto Seo, Tomoyuki Araki, Yasushi Hojo, Koichi Honke, Takayuki Murakoshi
Neuronal plasma membrane has been thought to retain a lot of lipid raft components which play important roles in the neural function. Although the biochemical analyses of lipid raft using brain tissues have been extensively carried out in the past 20 years, many of their experimental conditions do not coincide with those of standard neuroscience researches such as neurophysiology and neuropharmacology. Hence, the physiological methods for lipid raft analysis that can be compatible with general neuroscience have been required...
August 24, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28841776/cholera-toxin-subunit-b-enabled-multifunctional-glioma-targeted-drug-delivery
#11
Juan Guan, Zui Zhang, Xuefeng Hu, Yang Yang, Zhilan Chai, Xiaoqin Liu, Jican Liu, Bo Gao, Weiyue Lu, Jun Qian, Changyou Zhan
Glioma is among the most formidable brain cancers due to location in the brain. Cholera toxin subunit B (CTB) is investigated to facilitate multifunctional glioma-targeted drug delivery by targeting the glycosphingolipid GM1 expressed in the blood-brain barrier (BBB), neovasulature, and glioma cells. When modified on the surface of poly(lactic-co-glycolic acid) (PLGA) nanoparticles (CTB-NPs), CTB fully retains its bioactivity after 24 h incubation in the fresh mouse plasma. The formed protein corona (PC) of CTB-NP and plain PLGA nanoparticles (NP) after incubation in plasma is analyzed using liquid chromatography tandem massspectrometry (nano-LC-MS/MS)...
August 25, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28808998/microfluidics-mass-spectrometry-of-protein-carbohydrate-interactions-applications-to-the-development-of-therapeutics-and-biomarker-discovery
#12
Alina D Zamfir
The functional interactions of carbohydrates and their protein receptors are the basis of biological events critical to the evolution of pathological states. Hence, for the past years, such interactions have become the focus of research for the development of therapeutics and discovery of novel glycan biomarkers based on their binding affinity. Due to the high sensitivity, throughput, reproducibility, and capability to ionize minor species in heterogeneous mixtures, microfluidics-mass spectrometry (MS) has recently emerged as a method of choice in protein-glycan interactomics...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28808666/lipidomic-evaluation-of-feline-neurologic-disease-after-aav-gene-therapy
#13
Heather L Gray-Edwards, Xuntian Jiang, Ashley N Randle, Amanda R Taylor, Taylor L Voss, Aime K Johnson, Victoria J McCurdy, Miguel Sena-Esteves, Daniel S Ory, Douglas R Martin
GM1 gangliosidosis is a fatal lysosomal disorder, for which there is no effective treatment. Adeno-associated virus (AAV) gene therapy in GM1 cats has resulted in a greater than 6-fold increase in lifespan, with many cats remaining alive at >5.7 years of age, with minimal clinical signs. Glycolipids are the principal storage product in GM1 gangliosidosis whose pathogenic mechanism is not completely understood. Targeted lipidomics analysis was performed to better define disease mechanisms and identify markers of disease progression for upcoming clinical trials in humans...
September 15, 2017: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/28805811/caveolin-1-dependent-nanoscale-organization-of-the-bcr-regulates-b-cell-tolerance
#14
Susana Minguet, Kathrin Kläsener, Anna-Maria Schaffer, Gina J Fiala, Teresa Osteso-Ibánez, Katrin Raute, Inmaculada Navarro-Lérida, Frederike A Hartl, Maximilian Seidl, Michael Reth, Miguel A Del Pozo
Caveolin-1 (Cav1) regulates the nanoscale organization and compartmentalization of the plasma membrane. Here we found that Cav1 controlled the distribution of nanoclusters of isotype-specific B cell antigen receptors (BCRs) on the surface of B cells. In mature B cells stimulated with antigen, the immunoglobulin M BCR (IgM-BCR) gained access to lipid domains enriched for GM1 glycolipids, by a process that was dependent on the phosphorylation of Cav1 by the Src family of kinases. Antigen-induced reorganization of nanoclusters of IgM-BCRs and IgD-BCRs regulated BCR signaling in vivo...
October 2017: Nature Immunology
https://www.readbyqxmd.com/read/28796418/role-of-the-gm1-ganglioside-oligosaccharide-portion-in-the-trka-dependent-neurite-sprouting-in-neuroblastoma-cells
#15
Elena Chiricozzi, Diego Yuri Pomè, Margherita Maggioni, Erika Di Biase, Chiara Parravicini, Luca Palazzolo, Nicoletta Loberto, Ivano Eberini, Sandro Sonnino
GM1 ganglioside (II(3) NeuAc-Gg4 Cer) is known to promote neurite formation in neuroblastoma cells by activating TrkA-MAPK pathway. The molecular mechanism by which GM1 is involved in the neurodifferentiation process is still unknown, however, in vitro and in vivo evidences have suggested that the oligosaccharide portion of this ganglioside could be involved. Here, we report that, similarly to the entire GM1 molecule, its oligosaccharide II(3) NeuAc-Gg4, rather than its ceramide (Cer) portion is responsible for the neurodifferentiation process by augmenting neurite elongation and increasing the neurofilament protein expression in murine neuroblastoma cells, Neuro2a...
August 10, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28768095/investigating-the-influence-of-membrane-composition-on-protein-glycolipid-binding-using-nanodiscs-and-proxy-ligand-electrospray-ionization-mass-spectrometry
#16
Ling Han, Luis C Morales, Michele R Richards, Elena N Kitova, Simonetta Sipione, John S Klassen
This work describes a versatile analytical approach, which combines the proxy ligand electrospray ionization mass spectrometry (ESI-MS) assay and model membranes of defined composition, to quantify the influence of lipid bilayer composition on protein-glycolipid binding in vitro. To illustrate the implementation of the assay (experimental design and data analysis), affinities of the monosialoganglioside ligand GM1, incorporated into nanodiscs (NDs), for cholera toxin B subunit homopentamer (CTB5) were measured...
September 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28761428/monosialoganglioside-1-may-alleviate-neurotoxicity-induced-by-propofol-combined-with-remifentanil-in-neural-stem-cells
#17
Jiang Lu, Xue-Qin Yao, Xin Luo, Yu Wang, Sookja Kim Chung, He-Xin Tang, Chi Wai Cheung, Xian-Yu Wang, Chen Meng, Qing Li
Monosialoganglioside 1 (GM1) is the main ganglioside subtype and has neuroprotective properties in the central nervous system. In this study, we aimed to determine whether GM1 alleviates neurotoxicity induced by moderate and high concentrations of propofol combined with remifentanil in the immature central nervous system. Hippocampal neural stem cells were isolated from newborn Sprague-Dawley rats and treated with remifentanil (5, 10, 20 ng/mL) and propofol (1.0, 2.5, 5.0 μg/mL), and/or GM1 (12.5, 25, 50 μg/mL)...
June 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28749998/lc-ms-ms-multiplex-analysis-of-lysosphingolipids-in-plasma-and-amniotic-fluid-a-novel-tool-for-the-screening-of-sphingolipidoses-and-niemann-pick-type-c-disease
#18
Magali Pettazzoni, Roseline Froissart, Cécile Pagan, Marie T Vanier, Séverine Ruet, Philippe Latour, Nathalie Guffon, Alain Fouilhoux, Dominique P Germain, Thierry Levade, Christine Vianey-Saban, Monique Piraud, David Cheillan
BACKGROUND: The biological diagnosis of sphingolipidoses currently relies on the measurement of specific enzymatic activities and/or genetic studies. Lysosphingolipids have recently emerged as potential biomarkers of sphingolipidoses and Niemann-Pick type C in plasma. METHODOLOGY: We developed a sensitive and specific method enabling the simultaneous quantification of lysosphingolipids by LC-MS/MS: lysoglobotriaosylceramide for Fabry disease, lysohexosylceramide (i...
2017: PloS One
https://www.readbyqxmd.com/read/28744122/penetration-of-blood-brain-barrier-and-antitumor-activity-and-nerve-repair-in-glioma-by-doxorubicin-loaded-monosialoganglioside-micelles-system
#19
Dan Zou, Wei Wang, Daoxi Lei, Ying Yin, Peng Ren, Jinju Chen, Tieying Yin, Bochu Wang, Guixue Wang, Yazhou Wang
For the treatment of glioma and other central nervous system diseases, one of the biggest challenges is that most therapeutic drugs cannot be delivered to the brain tumor tissue due to the blood-brain barrier (BBB). The goal of this study was to construct a nanodelivery vehicle system with capabilities to overcome the BBB for central nervous system administration. Doxorubicin as a model drug encapsulated in ganglioside GM1 micelles was able to achieve up to 9.33% loading efficiency and 97.05% encapsulation efficiency by orthogonal experimental design...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28736286/lack-of-immunotoxic-effects-of-repeated-exposure-to-atrazine-associated-with-the-adaptation-of-adrenal-gland-activation
#20
Chad D Foradori, Arthur D Zimmerman, Pragati S Coder, Vanessa L Peachee, Robert J Handa, Ian Kimber, Stephen B Pruett, Charles B Breckenridge
T cell-dependent IgM antibody production and natural killer cell (NKC) activity were assessed in SD rats orally administered atrazine for 28 days to males (0, 6.5, 25, or 100 mg/kg/day) or females (0, 3, 6, or 50 mg/kg/day), or 30 or 500 ppm in diet (3 or 51 mg/kg/day). Anti-asialo GM1 antibodies (NKC) and cyclophosphamide (antibody-forming cell assay [AFC]) served as positive controls. Pituitary (ACTH, prolactin), adrenal (corticosterone, progesterone, aldosterone), and gonadal (androgens, estrogens) hormones were assessed after 1, 7, and/or 28 days of treatment...
July 20, 2017: Regulatory Toxicology and Pharmacology: RTP
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