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Liposomes characterization

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https://www.readbyqxmd.com/read/29144759/degree-of-unsaturation-and-backbone-orientation-of-amphiphilic-macromolecules-influence-local-lipid-properties-in-large-unilamellar-vesicles
#1
Kathryn E Uhrich, Alysha Moretti, Bin Zhang, Bernice Lee, Meenakshi Dutt
Liposomes have become increasingly common in the delivery of bioactive agents due to their ability to encapsulate hydrophobic and hydrophilic drugs with excellent biocompatibility. While commercial liposome formulations improve bioavailability of otherwise quickly eliminated or insoluble drugs, tailoring formulation properties for specific uses has become a focus of liposome research. Here, we report the design, synthesis, and characterization of two series of amphiphilic macromolecules (AMs), consisting of acylated polyol backbones conjugated to poly(ethylene glycol) (PEG) that can serve as the sole additives to stabilize and control hydrophilic molecule release rates from distearoyl-phosphatidylcholine- (DSPC-) based liposomes...
November 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29141534/characterization-methods-for-solid-lipid-nanoparticles-sln-and-nanostructured-lipid-carriers-nlc
#2
Velichka Andonova, Petya Peneva
BACKGROUND: Solid lipid nanoparticles (SLN) and the next generation of nanostructured lipid carriers (NLC) seem to be a very promising alternative to other colloidal carriers such as liposomes, microemulsions, and polymeric nanoparticles. These combine the advantages of the cited nanocarriers and can improve the dissolution rate in biological fluids, increase the drug absorption, improve the tissue distribution in the target organ, enhance the drug bioavailability and ensure controlled drug release...
November 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29141403/lipogels-for-encapsulation-of-hydrophilic-proteins-and-hydrophobic-small-molecules
#3
Celia C Homyak, Ann Fernandez, Mollie A Touve, Bo Zhao, Francesca Anson, Jeanne A Hardy, Richard W Vachet, Nathan C Gianneschi, Jennifer L Ross, S Thayumanavan
Lipid-polymer hybrid materials have the potential to exhibit enhanced stability and loading capabilities in comparison to parent liposome or polymer materials. However, complexities lie in formulating and characterizing such complex nanomaterials. Here we describe a lipid-coated polymer gel (lipogel) formulated using a one-pot methodology, where self-assembling liposomes template a UV-curable polymer gel core. Using fluorescently-labeled lipids, protein, and hydrophobic molecules, we have characterized their formation, purification, stability, and encapsulation efficiency via common instrumentation methods such as dynamic light scattering (DLS), matrix-assisted laser desorption ionization-mass spectrometry (MALDI-MS), UV-Visible spectroscopy, fluorescence spectroscopy, and single particle total internal reflection fluorescence (TIRF) microscopy...
November 15, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29138489/a-dual-channel-endoscope-for-quantitative-imaging-monitoring-and-triggering-of-doxorubicin-release-from-liposomes-in-living-mice
#4
Jeremy Kress, Daniel J Rohrbach, Kevin A Carter, Dandan Luo, Chien Poon, Semra Aygun-Sunar, Shuai Shao, Shashikant Lele, Jonathan F Lovell, Ulas Sunar
Doxorubicin (Dox) is approved for use in liposomal form for the treatment of ovarian cancer. We previously developed a long-circulating Dox formulation in liposomes containing small amounts of porphyrin-phospholipid, which enables on-demand drug release with near-infrared irradiation. In this study, we present and evaluate a dual-modal, dual-channel light endoscope that allows quantitative reflectance and fluorescence imaging for monitoring of local Dox concentrations in target areas. The endoscope consists of two flexible imaging fibers; one to transmit diagnostic and therapeutic light to the target, and the other to detect fluorescent and reflected light...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29130500/purification-characterization-and-application-of-a-novel-antimicrobial-peptide-from-andrias-davidianus-blood
#5
Jinjin Pei, Zhenzhen Feng, Ting Ren, Haiyan Sun, Hao Han, Wengang Jin, Jun Dang
The Andrias davidianus has been known as a traditional Chinese medicine for a long time. Its blood is considered as a waste or by-product of the meat production industry. Although there are reports on isolation of the antimicrobial peptides from different resources, there are no reports of their isolation from Andrias davidianus blood. In this work, an antimicrobial peptide, andricin B, was isolated from the blood of Andrias davidianus by an innovative method in which the magnetic liposome adsorption was combined with reversed-phase high performance liquid chromatography...
November 11, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29128836/characterization-of-liposome-containing-spions-conjugated-with-anti-cd20-developed-as-a-novel-theranostic-agent-for-central-nervous-system-lymphoma
#6
S Saesoo, S Sathornsumetee, P Anekwiang, C Treetidnipa, P Thuwajit, S Bunthot, W Maneeprakorn, L Maurizi, H Hofmann, Ruktanonchai Uracha Rungsardthong, N Saengkrit
Despite advances in neuroscience cancer research during the past decades, the survival of cancer patients has only marginally improved and the cure remains unlikely. The blood-brain barrier (BBB) is a major obstacle protecting the entry of therapeutic agents to central nervous system, especially for primary central nervous system lymphoma (PCNSL). Thus, the use of small nanoparticle as a drug carrier may be new strategies to overcome this problem. In this study, we fabricated liposome consisting of superparamagnetic iron oxide nanoparticles (SPIONs) functionalized with anti-CD20 (Rituximab; RTX)...
November 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29127038/lysine-containing-cationic-liposomes-activate-nlrp3-inflammasome-effect-of-a-spacer-between-the-head-group-and-the-hydrophobic-moieties-of-the-lipids
#7
Tianshu Li, Jieyan He, Gabor Horvath, Tomasz Próchnicki, Eicke Latz, Shinji Takeoka
Cationic lipids containing lysine head groups and ditetradecyl, dihexadecyl or dioctadecyl glutamate hydrophobic moieties with/without propyl, pentyl or heptyl spacers were applied for the preparation of cationic liposomes using a simple bath type-sonicator. The size distribution, zeta potential, cellular internalization, and cytotoxicity of the liposomes were characterized, and the innate immune stimulation, e.g., NLRP3 inflammasome activation of human macrophages and THP-1 cells were evaluated by the detection of IL-1ß release...
November 7, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/29125659/multiple-consecutive-recapture-of-rigid-nanoparticles-using-a-solid-state-nanopore-sensor
#8
Jung Soo Lee, Bin Peng, Ahmet Can Sabuncu, Seungjin Nam, Chi Won Ahn, Moon J Kim, Min Jun Kim
Solid-state nanopore sensors have been used to measure the size of a nanoparticle by applying a resistive pulse sensing technique. Previously, the size distribution of the population pool could be investigated utilizing data from a single translocation, however, the accuracy of the distribution is limited due to the lack of repeated data. In this study, we characterized polystyrene nanobeads utilizing single particle recapture techniques, which provide a better statistical estimate of the size distribution than that of single sampling techniques...
November 10, 2017: Electrophoresis
https://www.readbyqxmd.com/read/29124481/improved-antitumor-efficacy-and-pharmacokinetics-of-bufalin-via-pegylated-liposomes
#9
Jiani Yuan, Xuanxuan Zhou, Wei Cao, Linlin Bi, Yifang Zhang, Qian Yang, Siwang Wang
Bufalin was reported to show strong pharmacological effects including cardiotonic, antiviral, immune-regulation, and especially antitumor effects. The objective of this study was to determine the characterization, antitumor efficacy, and pharmacokinetics of bufalin-loaded PEGylated liposomes compared with bufalin entity, which were prepared by FDA-approved pharmaceutical excipients. Bufalin-loaded PEGylated liposomes and bufalin-loaded liposomes were prepared reproducibly with homogeneous particle size by the combination of thin film evaporation method and high-pressure homogenization method...
November 9, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29122613/hemin-and-myoglobin-catalyzed-reaction-of-1-palmitoyl-2-linoleoyl-3-sn-phosphatidylcholine-13-hydroperoxide-with-%C3%AE-tocopherol-in-micelles-and-liposomes
#10
Ryo Yamauchi, Tomomi Kinoshita, Yoshinori Hasegawa, Satoshi Iwamoto
The secondary process of lipid peroxidation proceeds by the free radical reaction to produce some toxic aldehydes. Since γ-tocopherol (γ-TH), one of the major forms of vitamin E in some vegetable oils, acts as a free radical scavenger, γ-TH may suppress the formation of such aldehydes. This study reports the effect and reaction products of γ-TH on the hemin- or myoglobin-catalyzed decomposition of 1-palmitoyl-2-linoleoyl-3-sn-phosphatidylcholine 13-hydroperoxide (PLPC-OOH) in micelles and liposomes. γ-TH and PLPC-OOH in micelles were reacted in the presence of hemin, and the reaction products were characterized as 1-palmitoyl-2-[(8a-dioxy-γ-tocopherone)-12,13-epoxyoctadecenoyl]-3-sn-phosphatidylcholines (γT-OO-epoxyPLPC), 1-palmitoyl-2-[(γ-tocopheroxy)-12,13-epoxyoctadecenoyl]-3-sn-phosphatidylcholines (γT-epoxyPLPC), and the adducts of γ-TH dimer with PLPC-OOH derived epoxyperoxyl and epoxyalkyl radicals (γTD-OO-epoxyPLPC and γTD-epoxyPLPC)...
November 7, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/29111431/fliposomes-trans-2-aminocyclohexanol-based-amphiphiles-as-ph-sensitive-conformational-switches-of-liposome-membrane-a-structure-activity-relationship-study
#11
Yu Zheng, Xin Liu, Nataliya M Samoshina, Vyacheslav V Samoshin, Andreas H Franz, Xin Guo
Recently developed lipids with the trans-2-aminocyclohexanol (TACH) moiety represent unique pH-sensitive conformational switches ("flipids") that can trigger the membrane of liposome-based drug delivery systems at lowered pH as seen in many pathological scenarios. A library of flipids with various TACH-based headgroups and hydrocarbon tails were designed, prepared, and characterized to systematically elucidate the relationship between their chemical structures and their ability to form and to trigger liposomes...
October 27, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/29111151/experimental-optimization-of-lornoxicam-liposomes-for-sustained-topical-delivery
#12
Joshny Joseph, Vedha Hari B N, Ramya Devi D
The purpose of the present investigation is to formulate liposomes of Lornoxicam for topical delivery using Central Composite Design, to provide a sustained release of the drug and thereby extend its elimination half-life. Liposomes were prepared by thin film hydration method with pH induced vesiculation. The liposomes were assessed for their particle size, charge, morphology and drug entrapment and characterized using TGA-DSC and FTIR analysis, to assess the interaction between the drug and excipients. The in vitro release study was performed using modified USP dissolution apparatus-I using three different dissolution media and the ex vivo release study was performed using goat skin...
October 27, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29110283/epha2-targeted-doxorubicin-nanoliposomes-for-osteosarcoma-treatment
#13
Fateme Haghiralsadat, Ghasem Amoabediny, Samira Naderinezhad, Kamran Nazmi, Jantine Posthuma De Boer, Behrouz Zandieh-Doulabi, Tymour Forouzanfar, Marco N Helder
PURPOSE: To employ Doxorubicin-loaded liposomes, modified with YSA-peptide to target EphA2, to reduce adverse effects against primary bone cells and maximize toxicity against Saos-2 osteosarcoma cells. METHODS: PEGylated liposomes were prepared by thin film method using Dipalmitoylphosphatidylcholine (DPPC), cholesterol and distearylphosphatidylethanolamine-polyethyleneglycol conjugate (DSPE-mPEG) in 67.9:29.1:3 M ratios, and loaded with DOX (L-DOX) by pH-gradient method...
November 6, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/29108958/novel-physical-chemistry-approaches-in-biophysical-researches-with-advanced-application-of-lasers-detection-and-manipulation
#14
REVIEW
Koichi Iwata, Masahide Terazima, Hiroshi Masuhara
Novel methodologies utilizing pulsed or intense CW irradiation obtained from lasers have a major impact on biological sciences. In this article, recent development in biophysical researches fully utilizing the laser irradiation is described for three topics, time-resolved fluorescence spectroscopy, time-resolved thermodynamics, and manipulation of the biological assemblies by intense laser irradiation. First, experimental techniques for time-resolved fluorescence spectroscopy are concisely explained in Section 2...
November 3, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29101379/the-structural-basis-of-proton-driven-zinc-transport-by-zntb
#15
Cornelius Gati, Artem Stetsenko, Dirk J Slotboom, Sjors H W Scheres, Albert Guskov
Zinc is an essential microelement to sustain all forms of life. However, excess of zinc is toxic, therefore dedicated import, export and storage proteins for tight regulation of the zinc concentration have evolved. In Enterobacteriaceae, several membrane transporters are involved in zinc homeostasis and linked to virulence. ZntB has been proposed to play a role in the export of zinc, but the transport mechanism of ZntB is poorly understood and based only on experimental characterization of its distant homologue CorA magnesium channel...
November 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/29100265/nano-drug-for-pain-medicine
#16
Farshad Hasanzadeh-Kiabi
Pain is commonly categorized into two diverse groups: acute pain, characterized by early onset and last for a very short time; while chronic pain, characterized by a prolonged pain for least 3 months' duration. Timely and immediate management of critical pain is critical in reducing its aggravation to chronic pain. There has been successful application of nano-technology, nano-medicine to the treatment and management of pain both in clinical and experimental studies like the fabrication of nano-formulated liposomes to deliver drugs for pain therapy, formulation of non- steroidal anti-inflammatory drugs (NSAIDs)...
November 3, 2017: Drug Research
https://www.readbyqxmd.com/read/29091899/paclitaxel-loaded-folate-coated-long-circulating-and-ph-sensitive-liposomes-as-a-potential-drug-delivery-system-a-biodistribution-study
#17
Liziane O F Monteiro, Renata S Fernandes, Caroline M R Oda, Sávia C Lopes, Danyelle M Townsend, Valbert N Cardoso, Mônica C Oliveira, Elaine A Leite, Domenico Rubello, André L B de Barros
A range of antitumor agents for cancer treatment is available; however, they show low specificity, which often limit their use. Recently, we have reported the preparation of folate-coated long-circulating and pH-sensitive liposomes (SpHL-folate-PTX) loaded with paclitaxel (PTX), an effective drug for the treatment of solid tumors, including breast cancer. The purpose of this study was to prepare and characterize SpHL-PTX and SpHL-folate-PTX radiolabeled with technetium-99m ((99m)Tc). Biodistribution studies and scintigraphic images were performed after intravenous administration of (99m)Tc-PTX, (99m)Tc-SpHL-PTX and (99m)Tc-SpHL-folate-PTX into healthy and tumor-bearing mice...
October 28, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29090935/discovery-of-the-membrane-binding-domain-in-trifunctional-proline-utilization-a
#18
Shelbi Christgen, Weidong Zhu, Nikhilesh Sanyal, Bushra Mariam Bibi, John J Tanner, Donald Frederick Becker
Escherichia coli proline utilization A (EcPutA) is the archetype of trifunctional PutA flavoproteins, which function both as regulators of the proline utilization operon and bifunctional enzymes that catalyze the four-electron oxidation of proline to glutamate. EcPutA shifts from a self-regulating transcriptional repressor to a bifunctional enzyme in a process known as functional switching. The flavin redox state dictates the function EcPutA. Upon proline oxidation, the flavin becomes reduced, triggering a conformational change that causes EcPutA to dissociate from the put regulon and bind to the cellular membrane...
November 1, 2017: Biochemistry
https://www.readbyqxmd.com/read/29079916/formulation-of-99m-technetium-labeled-leuprolide-loaded-liposomes-and-its-biodistribution-study-in-new-zealand-white-female-rabbits-for-assessment-of-its-uterine-targeting-efficiency
#19
Arpita Patel, Amit Tyagi, Rakesh Kumar Sharma, Hetal Thakkar
Leuprolide acetate (LPA), a GnRH analogue, is drug of choice for treatment of uterine fibroids and endometriosis. The current marketed formulations of LPA show severe systemic side effects. This project aims to formulate LPA loaded liposomes to be administered by vaginal route for uterine targeting. Liposomes were prepared by thin film hydration method using 1:1 M ratio of DSPC: Cholesterol and characterized for vesicle size, zeta potential, entrapment efficiency, and loading. Radiolabeling of LPA was performed by direct labeling with reduced technetium-99m...
October 27, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/29078873/improving-the-efficacy-of-liposome-mediated-vascular-gene-therapy-via-lipid-surface-modifications
#20
Richard K Fisher, Samuel I Mattern-Schain, Michael D Best, Stacy S Kirkpatrick, Michael B Freeman, Oscar H Grandas, Deidra J H Mountain
BACKGROUND: We have previously defined mechanisms of intimal hyperplasia that could be targets for molecular therapeutics aimed at vascular pathology. However, biocompatible nanocarriers are needed for effective delivery. Cationic liposomes (CLPs) have been demonstrated as effective nanocarriers in vitro. However, in vivo success has been hampered by cytotoxicity. Recently, neutral PEGylated liposomes (PLPs) have been modified with cell-penetrating peptides (CPPs) to enhance cellular uptake...
November 2017: Journal of Surgical Research
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