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https://www.readbyqxmd.com/read/28212490/vitamin-e-succinate-grafted-chitosan-oligosaccharide-rgd-conjugated-tpgs-mixed-micelles-loaded-with-paclitaxel-for-u87mg-tumor-therapy
#1
Yanzuo Chen, Shu Feng, Wenchao Liu, Zeting Yuan, Peihao Yin, Feng Gao
The poor therapeutic efficacy of hydrophobic chemotherapeutic drugs is an intrinsic limitation to successful chemotherapy. In the present study, a multi-task delivery system based on arginine-glycine-aspartic acid peptide (RGD) decorated vitamin E succinate (VES)-grafted-chitosan oligosaccharide (CSO)/RGD-conjugated D-alpha-tocopheryl polyethylene glycol 1000 succinate (TPGS-RGD) mixed micelles (VeC/T-RGD MM) was first prepared for targeted delivery of paclitaxel (PTX), a hydrophobic anticancer drug, to improve the efficacy of U87MG tumor therapy...
February 17, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28211226/supramolecularly-engineered-amphiphilic-macromolecules-molecular-interaction-overrules-packing-parameters
#2
Prithankar Pramanik, Debes Ray, Vinod K Aswal, Suhrit Ghosh
We report molecular interaction-driven self-assembly of supramolecularly engineered amphiphilic macromolecules (SEAM) containing a single supramolecular structure-directing unit (SSDU) consisting of an H-bonding group connected to a naphthalene diimide chromophore. Two such SEAMs, P1-50 and P2-50, having the identical chemical structure and hydrophobic/hydrophilic balance, exhibit distinct self-assembled structures (polymersome and cylindrical micelle, respectively) due to a difference in the H-bonding group (hydrazide or amide, respectively) of the single SSDU...
February 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28202545/the-basis-for-acyl-specificity-in-the-tafazzin-reaction
#3
Michael Schlame, Yang Xu, Mindong Ren
Tafazzin is a mitochondrial enzyme that transfers fatty acids from phospholipids to lysophospholipids. Mutations in tafazzin cause abnormal molecular species of cardiolipin and the clinical phenotype of Barth syndrome. However, the mechanism by which tafazzin creates acyl specificity has been controversial. We have shown that the lipid phase state can produce acyl specificity in the tafazzin reaction but others have reported that tafazzin itself carries enzymatic specificity. To resolve this issue, we replicated and expanded the controversial experiments, i...
February 15, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28192249/a-glucose-targeted-mixed-micellar-formulation-outperforms-genexol-in-breast-cancer-cells
#4
Marcela A Moretton, Ezequiel Bernabeu, Estefanía Grotz, Lorena Gonzalez, Marcela Zubillaga, Diego A Chiappetta
Breast cancer represents the top cancer among women, accounting 521.000 deaths per year. Development of targeted nanomedicines to breast cancer tissues represents a milestone to reduce chemotherapy side effects. Taking advantage of the over-expression of glucose (Glu) membrane transporters in breast cancer cells, we aim to expand the potential of a paclitaxel (PTX)-loaded mixed micellar formulation based on polyvinyl caprolactam-polyvinylacetate-polyethylene glycol graft copolymer (Soluplus®) and D-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) by its surface decoration with Glu moieties...
February 10, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28191959/mitoxantrone-and-folate-tpgs2k-conjugate-hybrid-micellar-aggregates-to-circumvent-toxicity-and-enhance-efficiency-for-breast-cancer-therapy
#5
Nida El Islem Guissi, Huipeng Li, Yurui Xu, Farouk Semcheddine, Minglei Chen, Zhigui Su, Qineng Ping
Mitoxantrone (MTO) is a potent drug used to treat breast cancer; however, efforts to expand its applicability have been limited by the risk of cardiotoxicity. In this study, we successfully conjugated MTO or folic acid (FA) to a synthesized d-α-tocopheryl polyethylene glycol 2000 succinate (TPGS2k), which were short for MCT or FCT. These two micellar materials could self-assemble to form MCT micelles or MCT/FCT mixed micelles (FMCT) aiming to lower systemic toxicity, enhance entrapment efficiency and provide a platform for targeting delivery...
February 13, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28165804/improved-oral-absorption-and-anti-lung-cancer-activity-of-paclitaxel-loaded-mixed-micelles
#6
Jian Hou, E Sun, Zhen-Hai Zhang, Jing Wang, Lei Yang, Li Cui, Zhong-Cheng Ke, Xiao-Bin Tan, Xiao-Bin Jia, Huixia Lv
The aim of this study was to establish a paclitaxel (PTX)-loaded mixed micelle delivery system (PTX-TP-M) with vitamin E-TPGS (TPGS) and Plasdone®S-630 Copovidone (PVPS630) as carriers to improve the solubility, oral absorption, and anti-tumor activity of PTX against lung cancer. In this study, PTX-TP-M was prepared using the ethanol thin-film dispersion method followed by characterization of the binary mixed micelles system. The average size of the PTX-TP-M was 83.5 ± 1.8 nm with a polydispersity index of 0...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28165426/towards-an-understanding-of-the-low-bioavailability-of-quercetin-a-study-of-its-interaction-with-intestinal-lipids
#7
Gillian T Rich, Maria Buchweitz, Mark S Winterbone, Paul A Kroon, Peter J Wilde
We have studied the uptake of quercetin aglycone into CaCo-2/TC7 cells in the presence and absence of mixed micelles that are present in the human small intestine. The micelles inhibited the transport of quercetin into the cells. To gain an understanding of why this is the case we examined the solubilisation of quercetin in micelles of differing composition and into pure lipid phases. We did this by using the environmental sensitivity of quercetin's UV-visible absorption spectra and measurement of free quercetin by filtration of the micellar solutions...
February 5, 2017: Nutrients
https://www.readbyqxmd.com/read/28163163/mixed-micelles-of-lipoic-acid-chitosan-poly-ethylene-glycol-and-distearoylphosphatidylethanolamine-poly-ethylene-glycol-for-tumor-delivery
#8
Zeeneh Elsaid, Kevin M G Taylor, Sanyogitta Puri, Cath A Eberlein, Khuloud Al-Jamal, Jie Bai, Rebecca Klippstein, Julie Tzu-Wen Wang, Ben Forbes, Jasminder Chana, Satyanarayana Somavarapu
Many chemotherapeutics suffer from poor aqueous solubility and tissue selectivity. Distearoylphosphatidylethanolamine-poly(ethylene glycol) (DSPE-PEG) micelles are a promising formulation strategy for the delivery of hydrophobic anticancer drugs. However, storage and in vivo instability restrict their use. The aim of this study was to prepare mixed micelles, containing a novel polymer, lipoic acid-chitosan-poly(ethylene glycol) (LACPEG), and DSPE-PEG, to overcome these limitations and potentially increase cancer cell internalisation...
February 3, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28159721/development-of-oral-solid-self-emulsifying-lipid-formulations-of-risperidone-with-improved-in-vitro-dissolution-and-digestion
#9
Mohsin Kazi, Hassan Al-Qarni, Fars K Alanazi
: Liquid adsorption on solid adsorbent carriers is an emerging technique for oral lipid-based drug delivery systems. The purpose of the current study is to convert liquid into solid self-emulsifying lipid formulations (SELFs) using an inorganic adsorbent Neusilin® grade US2 (NUS2) and investigate in vitro dissolution and digestion performance of the model antipsychotic compound risperidone. METHODS: The liquid SELFs were designed using various oils, nonionic surfactants and converted into solid at various SELF: NUS2 (%m/m) mixing ratios...
January 31, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28156000/rhamnolipids-from-pseudomonas-aeruginosa-strain-w10-as-antibiofilm-antibiofouling-products-for-metal-protection
#10
Alif Chebbi, Mohamed Elshikh, Farazul Haque, Syed Ahmed, Sara Dobbin, Roger Marchant, Sami Sayadi, Mohamed Chamkha, Ibrahim M Banat
Industrial biofouling-problems associated with the accumulation of microorganisms from flowing water and fluids on processing surfaces can cause severe problems. A Pseudomonas aeruginosa strain W10 was isolated from industrial setting and found to produce predominantly di-rhamnolipids (Rha-Rha-C10-C10) with a yield of around 10 g L(-1) and a critical micelle concentration (CMC) of 80 mg L(-1) . P. aeruginosa W10 rhamnolipids were able to disrupt up to 99% of 48 h pre-formed biofilms of the Gram-positive organisms Bacillus licheniformis CAN55, Staphylococcus capitis SH6, and a mixed culture (strains CAN55, SH6, and W10), under static conditions, at concentrations of 0...
February 3, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28155337/hyaluronic-acid-modified-didecyldimethylammonium-bromide-d-a-tocopheryl-polyethylene-glycol-succinate-mixed-micelles-for-delivery-of-baohuoside-i-against-non-small-cell-lung-cancer-in-vitro-and-in-vivo-evaluation
#11
Hongmei Yan, Jie Song, Xiaobin Jia, Zhenhai Zhang
Baohuoside I is an effective but a poorly soluble antitumor drug. In this study, we prepared baohuoside I-loaded mixed micelles with didecyldimethylammonium bromide (DDAB) and d-a-tocopheryl polyethylene glycol succinate (TPGS) (DTBM) and active targeting mixed micelles (HDTBM) with hyaluronic acid (HA) as the targeting ligand on the surface of the mixed micelles. We performed a systematic comparative evaluation of the antiproliferative effect, cellular uptake, antitumor efficacy, and in vivo tumor targeting of these micelles using A549 cells...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28151022/enhanced-blood-brain-barrier-transport-of-vinpocetine-by-oral-delivery-of-mixed-micelles-in-combination-with-a-message-guider
#12
Jiaojiao Ding, Yujiao Sun, Jinfeng Li, Huimin Wang, Shirui Mao
The blood brain barrier represents an insurmountable obstacle for the therapy of central nervous system related diseases. Polymeric micelles have many desirable properties for brain targeting by oral delivery but the stability and targeting efficiency needs to be improved. In this study, it was demonstrated that binary micelle system can compensate the drawbacks of mono system by preparing mixed micelles in combination with PEG based copolymers. Here we explored a brain targeting drug delivery system via facile approaches using P123 based mixed micelles in combination with a message guider from traditional Chinese medicine, borneol, for oral delivery...
February 2, 2017: Journal of Drug Targeting
https://www.readbyqxmd.com/read/28145219/evaluation-of-mercury-in-environmental-samples-by-a-supramolecular-solventbased-dispersive-liquidliquid-microextraction-method-before-analysis-by-a-cold-vapor-generation-technique
#13
Jamshed Ali, Mustafa Tuzen, Tasneem G Kazi
Supramolecular solvent–based dispersive liquid–liquid microextraction was used as a preconcentration method for the determination of trace levels of Hg. This simple method accurately measured oxidized Hg<sup>II</sup> content in claystone and sandstone samples obtained from the Thar Coalfield in Pakistan. Cold vapor atomic absorption spectrometry was used as the detection technique because it is reliable and accurate. The Hg<sup>II</sup> in acidic media forms a complex with dithizone (DTz) in the presence of supramolecular solvent (tetrahydrofuran and 1-undecanol), forming reverse micelles...
February 1, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28144142/ascorbyl-palmitate-d-%C3%AE-tocopheryl-polyethylene-glycol-1000-succinate-monoester-mixed-micelles-for-prolonged-circulation-and-targeted-delivery-of-compound-k-for-antilung-cancer-therapy-in-vitro-and-in-vivo
#14
Youwen Zhang, Deyin Tong, Daobiao Che, Bing Pei, Xiaodong Xia, Gaofeng Yuan, Xin Jin
The roles of ginsenoside compound K (CK) in inhibiting tumor have been widely recognized in recent years. However, low water solubility and significant P-gp efflux have restricted its application. In this study, CK ascorbyl palmitate (AP)/d-α-tocopheryl polyethylene glycol 1000 succinate monoester (TPGS) mixed micelles were prepared as a delivery system to increase the absorption and targeted antitumor effect of CK. Consequently, the solubility of CK increased from 35.2±4.3 to 1,463.2±153.3 μg/mL. Furthermore, in an in vitro A549 cell model, CK AP/TPGS mixed micelles significantly inhibited cell growth, induced G0/G1 phase cell cycle arrest, induced cell apoptosis, and inhibited cell migration compared to free CK, all indicating that the developed micellar delivery system could increase the antitumor effect of CK in vitro...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28135859/recent-progress-in-drug-delivery-of-pluronic-p123-pharmaceutical-perspectives
#15
Li-Yan Zhao, Wan-Ming Zhang
This review focuses on recent investigations that used Pluronic P123 (P123) as pharmaceutical ingredients in vesicle, micelle, mixed micelle, in situ gel, tablet and emulsion, et al. The main results from these studies show that P123 can significantly increase the stability of incorporated hydrophobic drugs with enhanced in vitro cytotoxicity and cellular uptake of anticancer drugs. Moreover, modified forms of P123 with RGD, folate or other targeted marker have shown its therapeutic potentials in various types of tumors and cancers...
January 30, 2017: Journal of Drug Targeting
https://www.readbyqxmd.com/read/28135107/free-energy-of-scission-for-sodium-laureth-1-sulfate-wormlike-micelles
#16
Karsten Vogtt, Hanqiu Jiang, Gregory Beaucage, Michael Weaver
Wormlike micelles (WLMs) are nanoscale, self-assembled components of many products from shampoos to fracking fluids due to their viscoelasticity. Their rheological behavior is largely governed by the contour length of the micelles and the concomitant propensity of the micelles to overlap and entangle. The large contour lengths, on the order of micrometers, is the result of a delicate balance between the scission enthalpy of the wormlike micelles on the one hand and entropic factors such as the mixing entropy of dispersion, the ordering of water molecules and counterions, and the mobility of branch points on the other hand...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28131580/factors-associated-with-milk-processing-characteristics-predicted-by-mid-infrared-spectroscopy-in-a-large-database-of-dairy-cows
#17
G Visentin, M De Marchi, D P Berry, A McDermott, M A Fenelon, M Penasa, S McParland
Despite milk processing characteristics being important quality traits, little is known about the factors underlying their variability, due primarily to the resources required to measure these characteristics in a sufficiently large population. Cow milk coagulation properties (rennet coagulation time, curd-firming time, curd firmness 30 and 60 min after rennet addition), heat coagulation time, casein micelle size, and pH were generated from available mid-infrared spectroscopy prediction models. The prediction models were applied to 136,807 spectra collected from 9,824 Irish dairy cows from research and commercial herds...
January 25, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28131522/combined-approach-using-capillary-electrophoresis-nmr-and-molecular-modeling-for-ambrisentan-related-substances-analysis-investigation-of-intermolecular-affinities-complexation-and-separation-mechanism
#18
Benedetta Pasquini, Fabrizio Melani, Claudia Caprini, Massimo Del Bubba, Sergio Pinzauti, Serena Orlandini, Sandra Furlanetto
A comprehensive investigation on the CE separation mechanisms and on the inclusion complexation with CyDs of the chiral drug S-ambrisentan (S-AMB), its R-enantiomer and other impurities was performed by different techniques. A CE method was previously set up allowing the simultaneous determination of the enantiomeric purity and of impurities of S-AMB, based on the addition of SDS micelles and γ-cyclodextrin (γCyD) to borate buffer. In this study, the electrophoretic behavior of the analytes in terms of selectivity and mobility with respect to the addition of different CyDs was first investigated, evidencing the presence of interactions for all the CyDs, but the unique ability of γCyD for obtaining the separation of all the compounds...
January 21, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28128560/mixing-block-copolymers-with-phospholipids-at-the-nanoscale-from-hybrid-polymer-lipid-wormlike-micelles-to-vesicles-presenting-lipid-nanodomains
#19
T P Tuyen Dao, A Brûlet, F Fernandes, M Er-Rafik, K Ferji, R Schweins, J-P Chapel, A Fedorov, M Schmutz, M Prieto, O Sandre, J-F Le Meins
Hybrids, i.e., intimately mixed polymer/phospholipid vesicles, can potentially marry in a single membrane the best characteristics of the two separate components. The ability of amphiphilic copolymers and phospholipids to self-assemble into hybrid membranes has been studied until now on the submicrometer scale using optical microscopy on giant hybrid unilamellar vesicles (GHUVs), but limited information is available on large hybrid unilamellar vesicles (LHUVs). In this work, copolymers based on poly(dimethylsiloxane) and poly(ethylene oxide) with different molar masses and architectures (graft, triblock) were associated with 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)...
February 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28118404/slow-phospholipid-exchange-between-a-detergent-solubilized-membrane-protein-and-lipid-detergent-mixed-micelles-brominated-phospholipids-as-tools-to-follow-its-kinetics
#20
Cédric Montigny, Thibaud Dieudonné, Stéphane Orlowski, José Luis Vázquez-Ibar, Carole Gauron, Dominique Georgin, Sten Lund, Marc le Maire, Jesper V Møller, Philippe Champeil, Guillaume Lenoir
Membrane proteins are largely dependent for their function on the phospholipids present in their immediate environment, and when they are solubilized by detergent for further study, residual phospholipids are critical, too. Here, brominated phosphatidylcholine, a phospholipid which behaves as an unsaturated phosphatidylcholine, was used to reveal the kinetics of phospholipid exchange or transfer from detergent mixed micelles to the environment of a detergent-solubilized membrane protein, the paradigmatic P-type ATPase SERCA1a, in which Trp residues can experience fluorescence quenching by bromine atoms present on phospholipid alkyl chains in their immediate environment...
2017: PloS One
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