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Liposomes characterization

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https://www.readbyqxmd.com/read/28106955/cypate-mediated-thermosensitive-nanoliposome-for-tumor-imaging-and-photothermal-triggered-drug-release
#1
Zhihao Han, Liwei Lv, Yi Ma, Zhaohui Wang, Yuxi Liu, Min Zhang, Siwen Li, Yueqing Gu
It is an emerging focus to explore controlled release drug delivery systems for simultaneous cancer imaging and therapy. Herein, we synthesized a photothermal sensitive multifunctional nano-liposome drug delivery system, with doxorubicin wrapped in the hydropholic layer as the therapeutical agent and cypate doped in the hydrophobic layer as the diagnostic agent. A series of in vitro and in vivo characterization demonstrated the stability of synthesized liposome, as the DL% was 9 ± 1.5 and the EE% was 82.7 ± 2...
January 20, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28105242/skin-toxicity-in-a-patient-with-ovarian-cancer-treated-with-pegylated-liposomal-doxorubicin-a-case-report-and-review-of-the-literature
#2
Joanna Kubicka-Wołkowska, Magdalena Kędzierska, Maja Lisik-Habib, Piotr Potemski
Pegylated liposomal doxorubicin (PLD) is a form of doxorubicin enclosed in pegylated liposomes. In contrast to conventional doxorubicin, PLD is characterized by a lower incidence of cardiotoxicity and myelosuppression. However, it induces specific mucocutaneous side effects, particularly palmar-plantar erythrodysesthesia (PPE). Other dermal manifestations, such as intertrigo-like dermatitis, diffuse follicular rash, melanotic macules, maculopapular rash or recall phenomenon are less common. Mechanisms that lead to skin toxicity remain unclear, however, certain reports indicate that drug excretion in sweat, host-vs...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28101458/cationic-liposomes-modified-with-polyallylamine-as-a-gene-carrier-preparation-characterization-and-transfection-efficiency-evaluation
#3
Reza Kazemi Oskuee, Asma Mahmoudi, Leila Gholami, Alireza Rahmatkhah, Bizhan Malaekeh-Nikouei
Purpose: Cationic polymers and cationic liposomes have shown to be effective non-viral gene delivery vectors. In this study, we tried to improve the transfection efficiency by employing the advantages of both. Methods: For this purpose, modified polyallylamines (PAAs) were synthesized. These modifications were done through the reaction of PAA (15 KDa) with acrylate and 6-bromoalkanoic acid derivatives. Liposomes comprising of these cationic polymers and cationic lipid were prepared and extruded through polycarbonate filters to obtain desired size...
December 2016: Advanced Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28088691/stability-effect-of-cholesterol-poly-acrylic-acid-in-a-stimuli-responsive-polymer-liposome-complex-obtained-from-soybean-lecithin-for-controlled-drug-delivery
#4
M G Simões, P Alves, Manuela Carvalheiro, P N Simões
The development of polymer-liposome complexes (PLCs), in particular for biomedical applications, has grown significantly in the last decades. The importance of these studies comes from the emerging need in finding intelligent controlled release systems, more predictable, effective and selective, for applications in several areas, such as treatment and/or diagnosis of cancer, neurological, dermatological, ophthalmic and orthopedic diseases, gene therapy, cosmetic treatments, and food engineering. This work reports the development and characterization of a pH sensitive system for controlled release based on PLCs...
January 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28071801/formation-and-characterization-of-green-tea-extract-loaded-liposomes
#5
Damla Dag, Mecit Halil Oztop
Green tea extract was encapsulated into liposomes to enhance bioavailability and stability of catechins by protecting their functional properties simultaneously. Encapsulation was achieved by dispersing 1% (w/v) soy lecithin through high pressure homogenization (microfluidization) and ultrasonication. Effects of homogenization type and pH of the dispersing medium on the physical properties and stability of the liposomes during 1-mo storage period were investigated. Mean particle size, total phenolic content by Folin-Ciocalteu method and antioxidant activity by 2-diphenyl-1-picrylhydrazyl radical scavenging and ferric reducing-antioxidant power methods, and transmission electron microscopy (TEM) experiments were conducted for characterization...
January 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28068766/membrane-adhesion-through-bridging-by-multimeric-ligands
#6
Omar Alexander Amjad, Bortolo Matteo Mognetti, Pietro Cicuta, Lorenzo Di Michele
Ligand/receptor multivalent interactions have been exploited to drive the self-assembly of nanoparticles, hard colloids, and more recently compliant units including emulsion droplets and lipid vesicles. In deformable liposomes, the formation of links between two membranes produces morphological changes depending on the amount of ligands in the environment. Here we study a proof-of-concept biosensing system in which single lipid vesicles adhere to a flat supported lipid bilayer, both decorated with membrane-anchored biotinylated receptors...
January 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28065862/liposome-encapsulated-berberine-treatment-attenuates-cardiac-dysfunction-after-myocardial-infarction
#7
Iris E Allijn, Bertrand M S Czarny, Xiaoyuan Wang, Suet Yen Chong, Marek Weiler, Acarilia Eduardo da Silva, Josbert M Metselaar, Carolyn Su Ping Lam, Giorgia Pastorin, Dominique P V de Kleijn, Gert Storm, Jiong-Wei Wang, Raymond M Schiffelers
Inflammation is a known mediator of adverse ventricular remodeling after myocardial infarction (MI) that may lead to reduction of ejection fraction and subsequent heart failure. Berberine is a isoquinoline quarternary alkaloid from plants that has been associated with anti-inflammatory, anti-oxidative, and cardioprotective properties. Its poor solubility in aqueous buffers and its short half-life in the circulation upon injection, however, have been hampering the extensive usage of this natural product. We hypothesized that encapsulation of berberine into long circulating liposomes could improve its therapeutic availability and efficacy by protecting cardiac function against MI in vivo...
January 5, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28059506/local-and-global-dynamics-in-klebsiella-pneumoniae-outer-membrane-protein-a-in-lipid-bilayers-probed-at-atomic-resolution
#8
Olivier Saurel, Iordan Iordanov, Guillaume Nars, Pascal Demange, Tanguy Le Marchand, Loren B Andreas, Guido Pintacuda, Alain Milon
The role of membrane proteins in cellular mechanism strongly depends on their dynamics, and solid-state magic-angle spinning (MAS) nuclear magnetic resonance (NMR) is a unique method to exhaustively characterize motions of proteins in a lipid environment. Herein, we make use of advances in (1)H-detected MAS NMR to describe the dynamics of the membrane domain of the Outer membrane protein A of Klebsiella pneumoniae (KpOmpA). By measuring (1)H-(15)N dipolar-coupling as well as (15)N R1 and R1ρ relaxation rates at fast (60 kHz) MAS and high magnetic field (1 GHz), we were able to describe the motions of the residues of the β-barrel as a collective rocking of low amplitude and of hundreds of nanoseconds time scale...
January 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28049590/inhibitory-potential-of-flavonoids-on-ptdins-3-4-5-p3-binding-with-the-phosphoinositide-dependent-kinase-1-pleckstrin-homology-domain
#9
Yelin Kang, Bong-Gyu Kim, Sunghoon Kim, Youngshim Lee, Youngdae Yoon
Many membrane-associated proteins are involved in various signaling pathways, including the phosphoinositide 3-kinase (PI3K) pathway, which has key roles in diverse cellular processes. Disruption of the activities of these proteins is involved in the development of disease in humans, making these proteins promising targets for drug development. In most cases, the catalytic domain is targeted; however, it is also possible to target membrane associations in order to regulate protein activity. In this study, we established a novel method to study protein-lipid interactions and screened for flavonoid-derived antagonists of PtdIns(3,4,5)P3 binding with the phosphoinositide-dependent kinase 1 (PDK1) pleckstrin homology (PH) domain...
December 23, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28045540/characterization-of-pegylated-liposomal-mitomycin-c-lipid-based-prodrug-promitil%C3%A2-by-high-sensitivity-differential-scanning-calorimetry-and-cryogenic-transmission-electron-microscopy
#10
Xiaohui Wei, Yogita Patil, Patricia Ohana, Yasmine Amitay, Hilary Shmeeda, Alberto Gabizon, Yechezkel Barenholz
The effect of a lipidated prodrug of mitomycin C (MLP) on the membrane of a pegylated liposome formulation (PL-MLP), also known as Promitil®, was characterized through high-sensitivity differential scanning calorimetry (DSC), and cryo-TEM. The thermodynamic analysis demonstrated that MLP led to the formation of heterogeneous domains in the membrane plane of PL-MLP. MLP concentrated in prodrug-rich domains, arranged in high-ordered crystal-like structures, as suggested by the sharp and high enthalpy endotherm in the 1st heating scanning...
January 3, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28042085/sequential-hifu-heating-and-nanobubble-encapsulation-provide-efficient-drug-penetration-from-stealth-and-temperature-sensitive-liposomes-in-colon-cancer
#11
Joshua VanOsdol, Kalyani Ektate, Selvarani Ramasamy, Danny Maples, Willie Collins, Jerry Malayer, Ashish Ranjan
Mild hyperthermia generated using high intensity focused ultrasound (HIFU) and microbubbles (MBs) can improve tumor drug delivery from non-thermosensitive liposomes (NTSLs) and low temperature sensitive liposomes (LTSLs). However, MB and HIFU are limited by the half-life of the contrast agent and challenges in accurate control of large volume tumor hyperthermia for longer duration (>30min.). The objectives of this study were to: 1) synthesize and characterized long-circulating echogenic nanobubble encapsulated LTSLs (ELTSLs) and NTSLs (ENTSLs), 2) evaluate in vivo drug release following short duration (~20min each) HIFU treatments administered sequentially over an hour in a large volume of mouse xenograft colon tumor, and 3) determine the impact of the HIFU/nanobubble combination on intratumoral drug distribution...
December 30, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28035925/novel-phospho-tau-monoclonal-antibody-generated-using-a-liposomal-vaccine-with-enhanced-recognition-of-a-conformational-tauopathy-epitope
#12
Clara Theunis, Oskar Adolfsson, Natalia Crespo-Biel, Kasia Piorkowska, Maria Pihlgren, David T Hickman, Valérie Gafner, Peter Borghgraef, Herman Devijver, Andrea Pfeifer, Fred Van Leuven, Andreas Muhs
The microtubule-associated protein Tau is an intrinsically unfolded, very soluble neuronal protein. Under still unknown circumstances, Tau protein forms soluble oligomers and insoluble aggregates that are closely linked to the cause and progression of various brain pathologies, including Alzheimer's disease. Previously we reported the development of liposome-based vaccines and their efficacy and safety in preclinical mouse models for tauopathy. Here we report the use of a liposomal vaccine for the generation of a monoclonal antibody with particular characteristics that makes it a valuable tool for fundamental studies as well as a candidate antibody for diagnostic and therapeutic applications...
December 30, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28025942/nano-medicine-improving-the-bioavailability-of-small-molecules-for-the-prevention-of-neurodegenerative-diseases
#13
Piera Di Martino, Roberta Censi, Maria Rosa Gigliobianco, Luana Zerrillo, Federico Magnoni, Dimitrios Agas, Wilma Quaglia, Giulio Lupidi
Neurodegenerative diseases, including Parkinson's and Alzheimer's, are a heterogeneous group of brain disorders characterized by the progressive degeneration of the structure and function of the central or peripheral nervous system. It is thought that the number of people affected by these pathologies will increase in future decades, particularly in the more economically developed countries, where the populations are experiencing a demographic shift towards older ages. For many of these pathologies, and in particular for Alzheimer's disease, no effective treatments are available, and the consequent economic and social costs are very high...
December 27, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27988500/non-coding-rnas-the-cancer-genome-dark-matter-that-matters
#14
Hui Ling, Leonard Girnita, Octavian Buda, George A Calin
Protein-coding genes comprise only 3% of the human genome, while the genes that are transcribed into RNAs but do not code for proteins occupy majority of the genome. Once considered as biological darker matter, non-coding RNAs are now being recognized as critical regulators in cancer genome. Among the many types of non-coding RNAs, microRNAs approximately 20 nucleotides in length are best characterized and their mechanisms of action are well generalized. microRNA exerts oncogenic or tumor suppressor function by regulation of protein-coding genes via sequence complementarity...
December 19, 2016: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/27987905/physico-chemical-characterization-of-succinyl-chitosan-stabilized-liposomes-for-the-oral-co-delivery-of-quercetin-and-resveratrol
#15
Carla Caddeo, Ramon Pons, Claudia Carbone, Xavier Fernàndez-Busquets, Maria Cristina Cardia, Anna Maria Maccioni, Anna Maria Fadda, Maria Manconi
In the present work, quercetin and resveratrol, natural polyphenols with strong antioxidant and anti-inflammatory properties, were co-loaded in polymer-associated liposomes conceived for oral delivery, by exploiting the potential of pH-sensitive succinyl-chitosan. Chitosan was succinylated, characterized by Nuclear Magnetic Resonance spectroscopy and Gel Permeation Chromatography, and used to form a protective shell on the surface of liposomes. The physico-chemical properties of the succinyl-chitosan liposomes were assessed by light scattering, zeta potential, cryogenic transmission electron microscopy, and small angle X-ray scattering...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27987857/effective-attenuation-of-vascular-restenosis-following-local-delivery-of-chitosan-decorated-sirolimus-liposomes
#16
Azadeh Haeri, Saeed Sadeghian, Shahram Rabbani, Maryam Sotoudeh Anvari, Samaneh Ghassemi, Fatemeh Radfar, Simin Dadashzadeh
Assuring the efficient local delivery via biocompatible nanosystems can be considered as a promising therapy for restenosis. The aim of the present study was preparation, in vitro characterization, and in vivo efficacy evaluation of sirolimus containing chitosan decorated liposomes for restenosis treatment. Liposomes were coated with chitosan, leading to ∼38nm increase in the particle size and a positive shift in the zeta potential from -1mV to +21mV. Chitosan modification was also confirmed by TEM, increased stability against detergent solubilization, and FTIR analyses...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27983791/quantitative-profiling-of-nanoscale-liposome-deformation-by-a-localized-surface-plasmon-resonance-sensor
#17
Joshua A Jackman, Saziye Yorulmaz Avsar, Abdul Rahim Ferhan, Danlin Li, Jae Hyeon Park, Vladimir P Zhdanov, Nam-Joon Cho
Characterizing the shape of sub-100 nm, biological soft-matter particulates (e.g., liposomes and exosomes) adsorbed at a solid-liquid interface remains a challenging task. Here, we introduce a localized surface plasmon resonance (LSPR) sensing approach to quantitatively profile the deformation of nanoscale, fluid-phase 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) liposomes contacting a titanium dioxide substrate. Experimental and theoretical results validate that, due to its high sensitivity to the spatial proximity of phospholipid molecules near the sensor surface, the LSPR sensor can discriminate fine differences in the extent of ionic strength-modulated liposome deformation at both low and high surface coverages...
December 28, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27979586/hydrazone-linkages-in-ph-responsive-drug-delivery-systems
#18
REVIEW
Sandeep J Sonawane, Rahul S Kalhapure, Thirumala Govender
Stimuli-responsive polymeric drug delivery systems using various triggers to release the drug at the sites have become a major focus area. Among various stimuli-responsive materials, pH-responsiveness has been studied extensively. The materials used for fabricating pH-responsive drug delivery systems include a specific chemical functionality in their structure that can respond to changes in the pH of the surrounding environment. Various chemical functionalities, for example, acetal, amine, ortho ester, amine and hydrazone, have been used to design materials that are capable of releasing their payload at the acidic pH conditions of the tumor or infection sites...
December 12, 2016: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27966351/fluorescent-biosensor-for-phosphate-determination-based-on-immobilized-polyfluorene-liposomal-nanoparticles-coupled-with-alkaline-phosphatase
#19
Zehra Kahveci, Maria José Martínez-Tomé, Ricardo Mallavia, C Reyes Mateo
This work describes the development of a novel fluorescent biosensor based on the inhibition of alkaline phosphatase (ALP). The biosensor is composed of the enzyme ALP and the conjugated cationic polyfluorene HTMA-PFP. The working principle of the biosensor is based on the fluorescence quenching of this polyelectrolyte by p-nitrophenol (PNP), a product of the hydrolysis reaction of p-nitrophenyl phosphate (PNPP) catalyzed by ALP. Because HTMA-PFP forms unstable aggregates in buffer, with low fluorescence efficiency, previous stabilization of the polyelectrolyte was required before the development of the biosensor...
December 22, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27951659/characterization-of-the-inward-and-outward-facing-substrate-binding-sites-of-the-prokaryotic-aspartate-transporter-gltph
#20
Benjamin C McIlwain, Robert J Vandenberg, Renae M Ryan
Crystal structures of the prokaryotic aspartate transporter, GltPh, have provided important insights into the mechanism of amino acid transport by GltPh and related eukaryotic members of the glutamate transporter family (SLC1A family). Identification of inhibitors of GltPh can provide valuable tools for understanding the molecular basis for substrate and inhibitor specificity and selectivity of SLC1A members, but at present, few inhibitors of GltPh have been identified. We have screened a collection of commercially available aspartate analogues and identified new transportable and nontransportable GltPh inhibitors...
December 13, 2016: Biochemistry
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