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Nanocapsule

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https://www.readbyqxmd.com/read/27915030/the-effect-of-anionic-dicephalic-surfactants-on-fabrication-of-varied-core-nanocarriers-for-sustained-release-of-porphyrin-photosensitizers
#1
Urszula Bazylińska, Renata Frąckowiak, Zbigniew Brzózka, Kazimiera A Wilk
Double-headed anionic surfactants could provide a profound group of efficient stabilizers of new template-mediated nanocarriers for effective encapsulation and sustained release of highly hydrophobic photosensitizers, and therefore their improved therapeutic activity in photodynamic therapy (PDT) protocols. We have thus encapsulated porphyrin-origin dyes, i.e., verteporfin (VP) and meso-tetraphenylporphyrin (TPP) in different types of sodium alkyliminobisacetates, Cn(COONa)2-stabilized nanosystems including biocompatible poly(l-glutamic acid)/poly(l-lysine) - PGA/PLL, multilayer nanocapsules (NCs)...
November 19, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27914343/fluorescence-and-drug-loading-properties-of-znse-mn-zns-paclitaxel-sio2-nanocapsules-templated-by-f127-micelles
#2
Tingting Zhao, Xin Liu, Yuebin Li, Mingguang Zhang, Jian He, Xuewen Zhang, Hui Liu, Xingguo Wang, Haoshuang Gu
Hydrophobic ZnSe:Mn/ZnS core-shell fluorescence quantum dots (QDs) and anticancer drug paclitaxel (PTX) have been co-loaded into folate conjugated hybrid silica nanocapsules via F127 micelles based soft-template method in a mild aqueous environment at room temperature. The encapsulation of QDs shows a F127: QDs mass ratio dependent behavior, which impact much on the morphology and optical properties of composite nanocapsules. These as prepared composite nanocapsules also exhibit good photoluminescence stability under the temperature ranges from 19°C to 49°C...
November 23, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27908760/affibody-displaying-bio-nanocapsules-effective-in-egfr-typical-biomarker-expressed-in-various-cancer-cells
#3
Yuya Nishimura, Ryosuke Ezawa, Jun Ishii, Chiaki Ogino, Akihiko Kondo
The expression of epidermal growth factor receptor (EGFR) across a wide range of tumor cells has attracted attention for use as a tumor marker in drug delivery systems. Therefore, binding molecules with the ability to target EGFR have been developed. Among them, we focused on affibodies that are binding proteins derived from staphylococcal protein A. By displaying affibody (ZEGFR) binding to EGFR on the surface of a bio-nanocapsule (BNC) derived from a hepatitis B virus (HBV), we developed an altered BNC (ZEGFR-BNC) with a high specificity to EGFR-expressing cells...
November 15, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27870992/nanoencapsulation-of-coenzyme-q10-and-vitamin-e-acetate-protects-against-uvb-radiation-induced-skin-injury-in-mice
#4
Natháli S Pegoraro, Allanna V Barbieri, Camila Camponogara, Juliane Mattiazzi, Evelyne S Brum, Marila C L Marchiori, Sara M Oliveira, Letícia Cruz
This study aimed to investigate the feasibility of producing semisolid formulations based on nanocapsule suspensions containing the association of the coenzyme Q10 and vitamin E acetate by adding gellan gum (2%) to the suspensions. Furthermore, we studied their application as an alternative for the treatment of inflammation induced by ultraviolet B (UVB) radiation. For this, an animal model of injury induced by UVB-radiation was employed. All semisolids presented pH close to 5.5, drug content above 95% and mean diameter on the nanometric range, after redispersion in water...
November 9, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27865858/biodistribution-of-radiolabeled-polyglutamic-acid-and-peg-polyglutamic-acid-nanocapsules
#5
Raquel Abellan-Pose, Maria Rodríguez-Évora, Sara Vicente, Noemi Csaba, Carmen Évora, Maria Jose Alonso, Araceli Delgado
Recently we reported the development of 100nm polyglutamic acid (PGA)-based nanocapsules, which were intended to carry anticancer drugs to the lymphatic system (Abellan-Pose et al., 2016). In this work, the objective was to further assess the potential "lympho-targeting" properties of radiolabeled (111)In-PGA and (111)In-PGA-PEG, following intravenous or subcutaneous administration. The results indicate that, following intravenous administration, both types of nanocapsules exhibit a modest accumulation in the lymph nodes (⩽2...
November 17, 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27863661/doxorubicin-enhances-curcumin-s-cytotoxicity-in-human-prostate-cancer-cells-in-vitro-by-enhancing-its-cellular-uptake
#6
Rebecca Klippstein, Sukhvinder S Bansal, Khuloud T Al-Jamal
Doxorubicin (DOX) is a widely used drug in cancer treatment. Despite its popularity, it suffers from systemic side effects and susceptibility to drug resistance. Curcumin (CURC), on the other hand, is a drug that recently gained popularity due to its wide range of biological activities, including anti-inflammatory and anti-cancer activities. Limitations to its clinical translation include its poor water solubility and the need for administration of high doses. Combinatory anti-cancer therapy has been proposed as a common approach to overcome one or more of these challenges...
November 30, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27859828/synthesis-of-polydopamine-like-nanocapsules-via-removal-of-a-sacrificial-mesoporous-silica-template-with-water
#7
Daniel Ruiz-Molina, Fabiana Nador, Eduardo Guisasola, Alejandro Baeza, Maria Vallet Regi
Hollow polymeric PDA micro-/nanocapsules have been obtained through a very simple, mild and straightforward method that involves coating of silica mesoporous nanoparticles through an ammonia-triggered polymerization of PDA and the posterior removal of the sacrificial template simply by dispersion in water, without the need of any harsh chemical reagent, either in the presence or absence of active principles, from doxorubicin to iron oxide nanoparticles. To demonstrate the potential of the nanocapsules obtained with this new approach, they have been successfully used as nanocarriers for drug delivery...
November 18, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27856263/rational-design-of-protamine-nanocapsules-as-antigen-delivery-carriers
#8
José Vicente González-Aramundiz, Elena Presas, Inmaculada Dalmau-Mena, Susana Martínez-Pulgarín, Covadonga Alonso, José M Escribano, María J Alonso, Noemi Stefánia Csaba
: Current challenges in global immunization indicate the demand for new delivery strategies, which could be applied to the development of new vaccines against emerging diseases, as well as to improve safety and efficacy of currently existing vaccine formulations. Here, we report a novel antigen nanocarrier consisting of an oily core and a protamine shell, further stabilized with pegylated surfactants. These nanocarriers, named protamine nanocapsules, were rationally designed to promote the intracellular delivery of antigens to immunocompetent cells and to trigger an efficient and long-lasting immune response...
November 14, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27855960/polyarginine-nanocapsules-as-a-potential-oral-peptide-delivery-carrier
#9
Giovanna Lollo, Ana Gonzalez-Paredes, Macros Garcia-Fuentes, Pilar Calvo, Dolores Torres, Maria Jose Alonso
We have previously reported the development of novel nanocapsules made of polyarginine (PArg) specifically designed for the delivery of small anticancer drugs into cells. Our goal, in this work, has been to investigate the potential of these nanocarriers for oral delivery of peptide anticancer drugs. To reach this objective, we chose the antitumoral peptide, elisidepsin, and evaluated the characteristics of the PArg nanocapsules in terms of drug loading capacity, stability in simulated intestinal fluids, and ability to interact with the intestinal epithelium both in vitro (Caco-2 model cell line) and in vivo...
November 14, 2016: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27853726/effects-of-ultrasound-irradiation-on-the-release-profile-of-5-fluorouracil-from-magnetic-polylactic-co-glycolic-acid-nanocapsules
#10
Z Abed, J Beik, S Khoee, S Khoei, A Shakeri-Zadeh, M B Shiran
BACKGROUND: Drug nano-carriers are one of the most important tools for targeted cancer therapy so that undesired side effects of chemotherapy drugs are minimized. In this area, the use of ultrasound can be helpful in controlling drug release from nanoparticles to achieve higher treatment efficiency. OBJECTIVE: Here, we studies the effects of ultrasound irradiation on the release profile of 5-fluorouracil (5-Fu) loaded magnetic poly lactic co-glycolic acid (PLGA) nanocapsules...
September 2016: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/27846779/effect-of-solvents-on-forming-poly-butyl-2-cyanoacrylate-encapsulated-paeonol-nanocapsules
#11
Jingjing Yao, Decheng Zeng, Yangxin Zhang, Dongdong Sun, Endong Yang, Haiping Liu, Feng Guo, Weiyun Wang
The effect of ethanol or acetone, as oil phase solvents, upon the form of paeonol-loaded poly(butyl-2-cyanoacrylate) encapsulated nanocapsules (Pae@PNCs) by interfacial spontaneously condensation were investigated. Pae@PNCs characterizations including morphology, radius distribution, polydispersity index (PDI), particle size, zeta potential, entrapment efficiency (EE%), drug loading (DL%) and in-vitro paeonol release kinetics were evaluated. Results show that 100% acetone have a significant effect on forming nanocapsules, which showed the smaller size (168...
November 16, 2016: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/27825878/an-artemisinin-mediated-ros-evolving-and-dual-protease-light-up-nanocapsule-for-real-time-imaging-of-lysosomal-tumor-cell-death
#12
Liwei Huang, Yingping Luo, Xian Sun, Huangxian Ju, Jiangwei Tian, Bo-Yang Yu
Lysosomes are critical organelles for cellular homeostasis and can be used as potential targets to kill tumor cells from inside. Many photo-therapeutic methods have been developed to overproduce reactive oxygen species (ROS) to trigger lysosomal membrane permeabilization (LMP)-associated cell death pathway. However, these technologies rely on extra irradiation to activate the photosensitizers, which limits the applications in treating deep seated tumors and widespread metastatic lesions. This work reports a multifunctional nanocapsule to achieve targeted lysosomal tumor cell death without irradiation and real-time monitoring of drug effect through encapsulating artemisinin and dual protease light-up nanoprobe in a folate-functionalized liposome...
October 11, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27825759/pegylated-polypeptide-lipid-nanocapsules-to-enhance-the-anticancer-efficacy-of-erlotinib-in-non-small-cell-lung-cancer
#13
Jeonghwan Kim, Thiruganesh Ramasamy, Ju Yeon Choi, Ssang Tae Kim, Yu Seok Youn, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
In this study, a core-shell type polypeptide-based lipid nanocapsule was developed to enhance anticancer efficacy of erlotinib in non-small cell lung cancers. Mean particle size of PEGylated polypeptide-lipid nanocapsules (PLN) for erlotinib (ERL) delivery was ∼200nm with an effective surface charge of -20mV. Protective PEGylated polypeptide layer acted as a molecular fence and effectively controlled the diffusion of erlotinib from the lipid nanocapsule core, whereas pH-responsiveness of poly(L-aspartic acid) accelerated the release of erlotinib in acidic conditions...
November 2, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27818052/scaffolds-for-oriented-and-close-packed-immobilization-of-immunoglobulins
#14
REVIEW
Masumi Iijima, Shun'ichi Kuroda
Immunosensing is a widely used technique that detects the interactions between antibodies and antigens such as biochemical markers, pathogens, allergens, and tumor-associated antigens. Since target antigens are often of high molecular mass and their binding affinities are sometimes weak, the spatial arrangement of immunoglobulin Gs (IgGs) on immunosensing probes should be optimized by presenting them in as close-packed a manner as possible and reducing steric hindrance around the antigen-binding Fv regions...
October 5, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27808287/an-intracellular-protein-delivery-platform-based-on-glutathione-responsive-protein-nanocapsules
#15
Jie Li, Linlin Zhang, Yang Liu, Jing Wen, Di Wu, Duo Xu, Tatiana Segura, Jing Jin, Yunfeng Lu, Hui Wang
An efficient strategy for the intracellular delivery of proteins was developed based on assembling proteins with a self-crosslinkable polymer. Such a disulfide-crosslinking structure enhances the stability of the protein-polymer assembly, and also allows effective dissociation of the assembly in response to glutathione, which allows effective delivery of various proteins with high intracellular bioactivity.
November 3, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27807499/nanomaterials-incorporated-ultrasound-contrast-agents-for-cancer-theranostics
#16
Lei Fu, Heng-Te Ke
Nanotechnology provides various nanomaterials with tremendous functionalities for cancer diagnostics and therapeutics. Recently, theranostics has been developed as an alternative strategy for efficient cancer treatment through combination of imaging diagnosis and therapeutic interventions under the guidance of diagnostic results. Ultrasound (US) imaging shows unique advantages with excellent features of real-time imaging, low cost, high safety and portability, making US contrast agents (UCAs) an ideal platform for construction of cancer theranostic agents...
September 2016: Cancer Biology & Medicine
https://www.readbyqxmd.com/read/27798416/effect-of-free-and-nanoencapsulated-copaiba-oil-on-monocrotaline-induced-pulmonary-arterial-hypertension
#17
Cristina Campos, Alexandre Luz de Castro, Angela Maria Vicente Tavares, Rafael Oliveira Fernandes, Vanessa Duarte Ortiz, Tatiane Evelyn Barboza, Cláudio Pereira, Miriam Apel, Onilda Santos da Silva, Susana Llesuy, Alex Sander da Rosa Araujo, Adriane Belló-Klein
Copaiba oil comes from an Amazonian tree and has been used as an alternative medicine in Brazil. However, it has not been investigated yet in the treatment of cardiovascular diseases. This study was designed to test whether copaiba oil or nanocapsules containing this oil could modulate monocrotaline (MCT)-induced pulmonary arterial hypertension (PAH). Male Wistar rats (170 ± 20 g) received oil or nanocapsules containing this oil (400 mg/kg) by gavage daily for one week. At the end of this period, a single injection of MCT (60 mg/kg i...
October 28, 2016: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/27792985/an-investigation-of-the-interactions-between-an-e-coli-bacterial-quorum-sensing-biosensor-and-chitosan-based-nanocapsules
#18
Xiaofei Qin, Christoph Engwer, Saaketh Desai, Celina Vila-Sanjurjo, Francisco M Goycoolea
We examined the interaction between chitosan-based nanocapsules (NC), with average hydrodynamic diameter ∼114-155nm, polydispersity ∼0.127, and ζ-potential ∼+50mV, and an E. coli bacterial quorum sensing reporter strain. Dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA) allowed full characterization and assessment of the absolute concentration of NC per unit volume in suspension. By centrifugation, DLS, and NTA, we determined experimentally a "stoichiometric" ratio of ∼80 NC/bacterium...
October 17, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27788227/perfluorocarbon-loaded-lipid-nanocapsules-to-assess-the-dependence-of-u87-human-glioblastoma-tumor-po2-on-in-vitro-expansion-conditions
#19
Laurent Lemaire, Janske Nel, Florence Franconi, Guillaume Bastiat, Patrick Saulnier
Growing tumor cell lines, such as U87-MG glioma cells, under mild hypoxia (3% O2) leads to a ca. 40% reduction in growth rate once implanted in the brain of nude mice, as compared to normoxia (21% O2) grown cells, wherein the former over-express HIF-1 and VEGF-A. Despite developing differently, the tumors have similar: blood perfusion, oxygen consumption, and vascular surface area parameters, whereas the number of blood vessels is nearly doubled in the tumor arising from normoxia cultured cells. Interestingly, tumor oxygen tension, measured using 19F-oximetry, showed that the normoxia grown cells led to tumors characterized by mild hypoxic environment (approximately 4%) conditions, whilst the hypoxia grown cells led to tumors characterized by physioxic environment (approximately 6%) conditions...
2016: PloS One
https://www.readbyqxmd.com/read/27784961/elucidation-of-the-early-infection-machinery-of-hepatitis-b-virus-by-using-bio-nanocapsule
#20
REVIEW
Qiushi Liu, Masaharu Somiya, Shun'ichi Kuroda
Currently, hepatitis B virus (HBV), upon attaching to human hepatocytes, is considered to interact first with heparan sulfate proteoglycan (HSPG) via an antigenic loop of HBV envelope S protein. Then, it is promptly transferred to the sodium taurocholate cotransporting polypeptide (NTCP) via the myristoylated N-terminal sequence of pre-S1 region (from Gly-2 to Gly-48, HBV genotype D), and it finally enters the cell by endocytosis. However, it is not clear how HSPG passes HBV to NTCP and how NTCP contributes to the cellular entry of HBV...
October 14, 2016: World Journal of Gastroenterology: WJG
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