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Lipid membrane interactions neurons

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https://www.readbyqxmd.com/read/28240273/amyloid-plaque-structure-and-cell-surface-interactions-of-%C3%AE-amyloid-fibrils-revealed-by-electron-tomography
#1
Shen Han, Marius Kollmer, Daniel Markx, Stephanie Claus, Paul Walther, Marcus Fändrich
The deposition of amyloid fibrils as plaques is a key feature of several neurodegenerative diseases including in particular Alzheimer's. This disease is characterized, if not provoked, by amyloid aggregates formed from Aβ peptide that deposit inside the brain or are toxic to neuronal cells. We here used scanning transmission electron microscopy (STEM) to determine the fibril network structure and interactions of Aβ fibrils within a cell culture model of Alzheimer's disease. STEM images taken from the formed Aβ amyloid deposits revealed three main types of fibril network structures, termed amorphous meshwork, fibril bundle and amyloid star...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28154182/reduced-lipid-bilayer-thickness-regulates-the-aggregation-and-cytotoxicity-of-amyloid-%C3%AE
#2
Kyle J Korshavn, Cristina Satriano, Yuxi Lin, Rongchun Zhang, Mark Dulchavsky, Anirban Bhunia, Magdalena I Ivanova, Young-Ho Lee, Carmelo La Rosa, Mi Hee Lim, Ayyalusamy Ramamoorthy
The aggregation of amyloid-Aβ (Aβ) on lipid bilayers has been implicated as a mechanism by which Aβ exerts its toxicity in Alzheimer's disease (AD). Lipid bilayer thinning has been observed during both oxidative stress and protein aggregation in AD, but whether these pathological modifications of the bilayer correlate with Aβ misfolding is unclear. Here, we studied peptide-lipid interactions in synthetic bilayers of the short-chain lipid dilauroyl phosphatidylcholine (DLPC) as a simplified model for diseased bilayers to determine their impact on Aβ aggregate, protofibril, and fibril formation...
February 1, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28135799/amyloid-%C3%AE-ion-channels-in-a-membrane-comprising-brain-total-lipid-extracts
#3
Joon Lee, Young Hun Kim, Fernando T Arce, Alan L Gillman, Hyunbum Jang, Bruce L Kagan, Ruth Nussinov, Jerry Yang, Ratnesh Lal
Amyloid β (Aβ) oligomers are the predominant toxic species in the pathology of Alzheimer's disease. The prevailing mechanism for toxicity by Aβ oligomers includes ionic homeostasis destabilization in neuronal cells by forming ion channels. These channel structures have been previously studied in model lipid bilayers. In order to gain further insight into the interaction of Aβ oligomers with natural membrane compositions, we have examined the structures and conductivities of Aβ oligomers in a membrane composed of brain total lipid extract (BTLE)...
February 20, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28062666/cyclodextrin-has-conflicting-actions-on-autophagy-flux-in-vivo-in-brains-of-normal-and-alzheimer-model-mice
#4
Dun-Sheng Yang, Philip Stavrides, Asok Kumar, Ying Jiang, Panaiyur S Mohan, Masuo Ohno, Kostantin Dobrenis, Cristin D Davidson, Mitsuo Saito, Monika Pawlik, Chunfeng Huo, Steven U Walkley, Ralph A Nixon
2-hydroxypropyl-β-cyclodextrin (CYCLO), a modifier of cholesterol efflux from cellular membrane and endo-lysosomal compartments, reduces lysosomal lipid accumulations and has therapeutic effects in animal models of Niemann-Pick disease type C and several other neurodegenerative states. Here, we investigated CYCLO effects on autophagy in wild-type mice and TgCRND8 mice - an Alzheimer's Disease (AD) model exhibiting β-amyloidosis, neuronal autophagy deficits leading to protein and lipid accumulation within greatly enlarged autolysosomes...
January 5, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28054433/insertion-of-neurotransmitters-into-a-lipid-bilayer-membrane-and-its-implication-on-membrane-stability-a%C3%A2-molecular-dynamics-study
#5
Chun Shen, Minmin Xue, Hu Qiu, Wanlin Guo
The signaling molecules in neurons, called neurotransmitters, play an essential role in the transportation of neural signals, during which the neurotransmitters interact with not only specific receptors, but also cytomembranes, such as synaptic vesicle membranes and postsynaptic membranes. Through extensive molecular dynamics simulations, the atomic-scale insertion dynamics of typical neurotransmitters, including methionine enkephalin (ME), leucine enkephalin (LE), dopamine (DA), acetylcholine (ACh), and aspartic acid (ASP), into lipid bilayers is investigated...
January 5, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27998775/in%C3%A2-vitro-effects-of-the-anti-alzheimer-drug-memantine-on-the-human-erythrocyte-membrane-and-molecular-models
#6
Pablo Zambrano, Mario Suwalsky, Fernando Villena, Malgorzata Jemiola-Rzeminska, Kazimierz Strzalka
Memantine is a NMDA antagonist receptor clinically used for treating Alzheimer's disease. NMDA receptors are present in the human neurons and erythrocyte membranes. The aim of the present study was to investigate the effects of memantine on human erythrocytes. With this purpose, the drug was developed to in vitro interact with human red cells and bilayers built-up of dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylethanolamine (DMPE). The latter represent lipids respectively present in both outer and inner monolayers of the red cell membrane...
January 29, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27997702/impulse-control-disorder-lysosomal-malfunction-and-atp13a2-insufficiency-in-parkinsonism
#7
REVIEW
Jun-Ping Liu, Jianfeng Li, Yanhua Lu, Lihui Wang, Gang Chen
Lysosomal transport of cargos in neurons is essential for neuronal proteostasis, transmission and functional motors and behaviors. Lysosomal malfunction including storage disorders is involved in the pathogenesis of Parkinson's disease (PD). Given the unclear molecular mechanisms of diverse defects in PD phenotypes, especially behavioral deficits, this mini review explores the cellular contexts of PD impulse control disorders and the molecular aspects of lysosomal cross-membrane transports. Focuses are paid to trace metal involvements in α-synuclein assembly in Lewy bodies, the functions and molecular interactions of ATP13A2 as ATPase transporters in lysosomal membranes for cross-membrane trafficking and lysosomal homeostasis, and our current understandings of the neural circuits in ICD...
December 20, 2016: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/27933798/high-affinity-binding-of-monomeric-but-not-oligomeric-amyloid-%C3%AE-to-ganglioside-gm1-containing-nanodiscs
#8
Maren Thomaier, Lothar Gremer, Christina Dammers, Judith Fabig, Philipp Neudecker, Dieter Willbold
The interaction of the amyloid-β protein (Aβ) with neuronal cell membranes plays a crucial role in Alzheimer's disease. Aβ undergoes structural changes upon binding to ganglioside GM1 containing membranes leading to altered molecular characteristics of the protein. The physiological role of the Aβ interaction with the ganglioside GM1 is still unclear. In order to further elucidate the molecular requirements of Aβ membrane binding, we tested different nanodiscs varying in their lipid composition, regarding the charge of the headgroups as well as ganglioside GM1 concentration...
December 6, 2016: Biochemistry
https://www.readbyqxmd.com/read/27884599/influence-of-sequence-and-lipid-type-on-membrane-perturbation-by-human-and-rat-amyloid-%C3%AE-peptide-1-42
#9
Anne M Brown, David R Bevan
The hallmark characteristics of plaque formation and neuronal cell death in Alzheimer's disease (AD) are caused principally by the amyloid β-peptide (Aβ). Aβ sequence and lipid composition are essential variables to consider when elucidating the impact of biological membranes on Aβ structure and the effect of Aβ on membrane integrity. Atomistic molecular dynamics simulations testing two Aβ sequences, human and rat Aβ (HAβ and RAβ, respectively), and five lipid types were performed to assess the effect of these variables on membrane perturbation and potential link to AD phenotype differences based on differences in sequence...
January 15, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/27871938/the-role-of-gpi-anchored-axonal-glycoproteins-in-neural-development-and-neurological-disorders
#10
REVIEW
Gianfranco Gennarini, Antonella Bizzoca, Sabrina Picocci, Daniela Puzzo, Patrizia Corsi, Andrew J W Furley
This review article focuses on the Contactin (CNTN) subset of the Immunoglobulin supergene family (IgC2/FNIII molecules), whose components share structural properties (the association of Immunoglobulin type C2 with Fibronectin type III domains), as well as a general role in cell contact formation and axonal growth control. IgC2/FNIII molecules include 6 highly related components (CNTN 1-6), associated with the cell membrane via a Glycosyl Phosphatidyl Inositol (GPI)-containing lipid tail. Contactin 1 and Contactin 2 share ~50 (49...
November 18, 2016: Molecular and Cellular Neurosciences
https://www.readbyqxmd.com/read/27814578/lipid-raft-er-signalosome-malfunctions-in-menopause-and-alzheimer-s-disease
#11
Ana Canerina-Amaro, Luis G Hernandez-Abad, Isidre Ferrer, David Quinto-Alemany, Fatima Mesa-Herrera, Carla Ferri, Ricardo A Puertas-Avendano, Mario Diaz, Raquel Marin
The increase in the incidence of Alzheimer's disease (AD) in old women may be attributable to estrogen deficiency, and estrogen replacement therapy may be useful in preventing or delaying the onset of this disease. In neuronal membranes, 17 beta-estradiol interacts with estrogen receptors (mERs) located in lipid raft signalosomes which trigger neuroprotective responses by anchoring to scaffolding caveolin-1 complexed with other proteins. We suggest that mER-signalosome malfunctions in AD and by menopause due to development of aberrations in these microstructures...
January 1, 2017: Frontiers in Bioscience (Scholar Edition)
https://www.readbyqxmd.com/read/27728769/real-time-quartz-crystal-microbalance-monitoring-of-free-docosahexaenoic-acid-interactions-with-supported-lipid-bilayers
#12
Kiera R Flynn, Lisandra L Martin, M Leigh Ackland, Angel A J Torriero
Docosahexaenoic acid (DHA) is the most abundant polyunsaturated omega-3 fatty acid found in mammalian neuronal cell membranes. Although DHA is known to be important for neuronal cell survival, little is know about how DHA interacts with phospholipid bilayers. This study presents a detailed quartz crystal microbalance with dissipation monitoring (QCM-D) analysis of free DHA interactions with individual and mixed phospholipid supported lipid bilayers (SLB). DHA incorporation and subsequent changes to the SLBs viscoelastic properties were observed to be concentration-dependent, influenced by the phospholipid species, the headgroup charge, and the presence or absence of calcium ions...
November 15, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27713956/lipidomic-approach-in-young-adult-triathletes-effect-of-supplementation-with-a-polyphenols-rich-juice-on-neuroprostane-and-f2-dihomo-isoprostane-markers
#13
Libia Alejandra García-Flores, Sonia Medina, Camille Oger, Jean-Marie Galano, Thierry Durand, Roberto Cejuela, José Miguel Martínez-Sanz, Federico Ferreres, Ángel Gil-Izquierdo
The aim of the this study was to determine the effect of a polyphenols-rich juice (aronia-citrus juice, ACJ) on F4-neuroprostanes and F2-dihomo-isoprostanes-markers of oxidative stress associated with the central nervous system (CNS)-in 16 elite triathletes under a controlled diet for triathlon training (145 days). In the triathletes, a decrease of the lipid peroxidation markers after ACJ intake, associated with neuronal membrane degradation (10-epi-10-F4t-neuroprostane and 10-F4t-neuroprostane), was observed when compared with placebo stage values...
October 12, 2016: Food & Function
https://www.readbyqxmd.com/read/27694812/a-plasma-membrane-microdomain-compartmentalizes-ephrin-generated-camp-signals-to-prune-developing-retinal-axon-arbors
#14
Stefania Averaimo, Ahlem Assali, Oriol Ros, Sandrine Couvet, Yvrick Zagar, Ioana Genescu, Alexandra Rebsam, Xavier Nicol
The development of neuronal circuits is controlled by guidance molecules that are hypothesized to interact with the cholesterol-enriched domains of the plasma membrane termed lipid rafts. Whether such domains enable local intracellular signalling at the submicrometre scale in developing neurons and are required for shaping the nervous system connectivity in vivo remains controversial. Here, we report a role for lipid rafts in generating domains of local cAMP signalling in axonal growth cones downstream of ephrin-A repulsive guidance cues...
October 3, 2016: Nature Communications
https://www.readbyqxmd.com/read/27641118/a-novel-approach-for-targeted-delivery-to-motoneurons-using-cholera-toxin-b-modified-protocells
#15
Maria A Gonzalez Porras, Paul N Durfee, Ashley M Gregory, Gary C Sieck, C Jeffrey Brinker, Carlos B Mantilla
BACKGROUND: Trophic interactions between muscle fibers and motoneurons at the neuromuscular junction (NMJ) play a critical role in determining motor function throughout development, ageing, injury, or disease. Treatment of neuromuscular disorders is hindered by the inability to selectively target motoneurons with pharmacological and genetic interventions. NEW METHOD: We describe a novel delivery system to motoneurons using mesoporous silica nanoparticles encapsulated within a lipid bilayer (protocells) and modified with the atoxic subunit B of the cholera toxin (CTB) that binds to gangliosides present on neuronal membranes...
November 1, 2016: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/27610460/ganglioside-lipid-and-ganglioside-protein-interactions-revealed-by-coarse-grained-and-atomistic-molecular-dynamics-simulations
#16
Ruo-Xu Gu, Helgi I Ingólfsson, Alex H de Vries, Siewert J Marrink, D Peter Tieleman
Gangliosides are glycolipids in which an oligosaccharide headgroup containing one or more sialic acids is connected to a ceramide. Gangliosides reside in the outer leaflet of the plasma membrane and play a crucial role in various physiological processes such as cell signal transduction and neuronal differentiation by modulating structures and functions of membrane proteins. Because the detailed behavior of gangliosides and protein-ganglioside interactions are poorly known, we investigated the interactions between the gangliosides GM1 and GM3 and the proteins aquaporin (AQP1) and WALP23 using equilibrium molecular dynamics simulations and potential of mean force calculations at both coarse-grained (CG) and atomistic levels...
October 4, 2016: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/27605302/site-specific-fluorescent-labeling-to-visualize-membrane-translocation-of-a-myristoyl-switch-protein
#17
Sung-Tae Yang, Sung In Lim, Volker Kiessling, Inchan Kwon, Lukas K Tamm
Fluorescence approaches have been widely used for elucidating the dynamics of protein-membrane interactions in cells and model systems. However, non-specific multi-site fluorescent labeling often results in a loss of native structure and function, and single cysteine labeling is not feasible when native cysteines are required to support a protein's folding or catalytic activity. Here, we develop a method using genetic incorporation of non-natural amino acids and bio-orthogonal chemistry to site-specifically label with a single fluorescent small molecule or protein the myristoyl-switch protein recoverin, which is involved in rhodopsin-mediated signaling in mammalian visual sensory neurons...
September 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27596061/effects-of-membrane-properties-on-the-binding-activities-of-the-hn-and-hc-heavy-chain-domains-of-botulinum-neurotoxin-a
#18
B Vijayalakshmi Ayyar, M Zouhair Atassi
Binding behaviors of the HN and the HC domains of BoNT/A were investigated individually to identify if there exist any differences in their interaction with the cell membrane. Recombinant fragments corresponding to both BoNT/A HN and HC regions were prepared (HN519-845 and HC967-1296) and their binding to synaptic proteins was verified. The binding behaviors of these heavy-chain domains were analyzed by treating the Neuro 2a, a murine neuroblastoma cell line, with compounds known to alter membrane properties...
December 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27565678/membrane-fluidity-does-not-explain-how-solvents-act-on-the-middle-ear-reflex
#19
Ludivine Wathier, Thomas Venet, Aurélie Thomas, Hervé Nunge, Elodie Bonfanti, Frédéric Cosnier, Cécile Parietti-Winkler, Pierre Campo, Pascale Tsan, Sabine Bouguet-Bonnet, Axel Gansmüller
Some volatile aromatic solvents have similar or opposite effects to anesthetics in the central nervous system. Like for anesthetics, the mechanisms of action involved are currently the subject of debate. This paper presents an in vivo study to determine whether direct binding or effects on membrane fluidity best explain how solvents counterbalance anesthesia's depression of the middle-ear reflex (MER). Rats were anesthetized with a mixture of ketamine and xylazine while also exposed to solvent vapors (toluene, ethylbenzene, or one of the three xylene isomers) and the amplitude of their MER was monitored...
August 24, 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27489575/the-initiation-of-post-synaptic-protrusions
#20
Pirta Hotulainen, Juha Saarikangas
The post-synaptic spines of neuronal dendrites are highly elaborate membrane protrusions. Their anatomy, stability and density are intimately linked to cognitive performance. The morphological transitions of spines are powered by coordinated polymerization of actin filaments against the plasma membrane, but how the membrane-associated polymerization is spatially and temporally regulated has remained ill defined. Here, we discuss our recent findings showing that dendritic spines can be initiated by direct membrane bending by the I-BAR protein MIM/Mtss1...
May 2016: Communicative & Integrative Biology
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