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Osmotic delivery systems

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https://www.readbyqxmd.com/read/28723417/long-term-morphine-delivery-via-slow-release-morphine-pellets-or-osmotic-pumps-plasma-concentration-analgesia-and-naloxone-precipitated-withdrawal
#1
Virginia D McLane, Ivy Bergquist, James Cormier, Deborah J Barlow, Karen L Houseknecht, Edward J Bilsky, Ling Cao
AIMS: Slow-release morphine sulfate pellets and osmotic pumps are common routes of chronic morphine delivery in mouse models, but direct comparisons of these drug delivery systems are lacking. In this study, we assessed the efficacy of slow-release pellets versus osmotic pumps in delivering morphine to adult mice. MAIN METHODS: Male C57BL/6NCr mice (8weeksold) were implanted subcutaneously with slow-release pellets (25mg morphine sulfate) or osmotic pumps (64mg/mL, 1...
July 16, 2017: Life Sciences
https://www.readbyqxmd.com/read/28710882/mid-trimester-preterm-premature-rupture-of-membranes-pprom-etiology-diagnosis-classification-international-recommendations-of-treatment-options-and-outcome
#2
REVIEW
Michael Tchirikov, Natalia Schlabritz-Loutsevitch, James Maher, Jörg Buchmann, Yuri Naberezhnev, Andreas S Winarno, Gregor Seliger
Mid-trimester preterm premature rupture of membranes (PPROM), defined as rupture of fetal membranes prior to 28 weeks of gestation, complicates approximately 0.4%-0.7% of all pregnancies. This condition is associated with a very high neonatal mortality rate as well as an increased risk of long- and short-term severe neonatal morbidity. The causes of the mid-trimester PPROM are multifactorial. Altered membrane morphology including marked swelling and disruption of the collagen network which is seen with PPROM can be triggered by bacterial products or/and pro-inflammatory cytokines...
July 15, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28688831/local-chemical-sympathectomy-of-rat-bone-marrow-and-its-effect-on-marrow-cell-composition
#3
P Dubový, I Klusáková, L Kučera, J Osičková, J Chovancová, T Loja, J Mayer, M Doubek, M Joukal
Existing experimental studies of the effect of sympathetic nerve fibers on bone marrow cells are based on the systemic administration of neurotoxic 6-hydroxydopamine. The method of global chemical sympathectomy has some serious disadvantages and could lead to questionable results. We describe a new method of local chemical sympathectomy of rat femoral bone marrow using guanethidine (Ismelin) delivery using an osmotic mini pump. Local guanethidine treatment for 14days led to complete elimination of sympathetic fibers in femoral bone marrow in contrast to bone marrow of contralateral or naïve femurs...
September 2017: Autonomic Neuroscience: Basic & Clinical
https://www.readbyqxmd.com/read/28668379/design-and-optimization-of-plga-microparticles-for-controlled-and-local-delivery-of-neuregulin-1-in-traumatic-spinal-cord-injury
#4
Kallivalappil T Santhosh, Arsalan Alizadeh, Soheila Karimi-Abdolrezaee
Spinal cord injury (SCI) results in significant tissue damage that underlies functional impairments. Pharmacological interventions to confer neuroprotection and promote cell replacement are essential for SCI repair. We previously reported that Neuregulin-1 (Nrg-1) is acutely and permanently downregulated after SCI. Nrg-1 is a critical growth factor for differentiation of neural precursor cells (NPCs) into myelinating oligodendrocytes. We showed that intrathecal delivery of Nrg-1 enhances oligodendrocyte replacement following SCI...
September 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28652345/dna-cytoskeleton-for-stabilizing-artificial-cells
#5
Chikako Kurokawa, Kei Fujiwara, Masamune Morita, Ibuki Kawamata, Yui Kawagishi, Atsushi Sakai, Yoshihiro Murayama, Shin-Ichiro M Nomura, Satoshi Murata, Masahiro Takinoue, Miho Yanagisawa
Cell-sized liposomes and droplets coated with lipid layers have been used as platforms for understanding live cells, constructing artificial cells, and implementing functional biomedical tools such as biosensing platforms and drug delivery systems. However, these systems are very fragile, which results from the absence of cytoskeletons in these systems. Here, we construct an artificial cytoskeleton using DNA nanostructures. The designed DNA oligomers form a Y-shaped nanostructure and connect to each other with their complementary sticky ends to form networks...
July 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28651005/optimization-of-a-murine-and-human-tissue-model-to-recapitulate-dermal-and-pulmonary-features-of-systemic-sclerosis
#6
Tomoya Watanabe, Tetsuya Nishimoto, Logan Mlakar, Jonathan Heywood, Maya Malaab, Stanley Hoffman, Carol Feghali-Bostwick
The murine bleomycin (BLM)-induced fibrosis model is the most widely used in systemic sclerosis (SSc) studies. It has been reported that systemic delivery of BLM via continuous diffusion from subcutaneously implanted osmotic minipumps can cause fibrosis of the skin, lungs, and other internal organs. However, the mouse strain, dosage of BLM, administration period, and additional important features differ from one report to the next. In this study, by employing the pump model in C57BL/6J mice, we show a dose-dependent increase in lung fibrosis by day 28 and a transient increase in dermal thickness...
2017: PloS One
https://www.readbyqxmd.com/read/28613387/dielectrophoretic-characterization-and-isolation-of-jellyfish-stinging-capsules
#7
Sinwook Park, Daniel Capelin, Gadi Piriatinskiy, Tamar Lotan, Gilad Yossifon
Jellyfish stinging capsules known as nematocysts are explosive, natural-injection systems with high potential as a natural drug-delivery system. These organelles consist of a capsule containing a highly folded thin needle-like tubule and a matrix highly concentrated with charged constituents that enable the tubule to fire and penetrate a target. For the purpose of using these nematocysts as drug delivery system it is first required to purify subpopulations from heterogeneous population of capsules and to investigate each subpopulation's distinct function and characteristics...
June 14, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28608781/nano-and-microparticles-at-fluid-and-biological-interfaces
#8
Sabyasachi Dasgupta, Thorsten Auth, Gerhard Gompper
Systems with interfaces are abundant in both technological applications and biology. While a fluid interface separates two fluids, membranes separate the inside of vesicles from the outside, the interior of biological cells from the environment, and compartmentalize cells into organelles. The physical properties of interfaces are characterized by interface tension, those of membranes are characterized by bending and stretching elasticity. Amphiphilic molecules like surfactants that are added to a system with two immiscible fluids decrease the interface tension and induce a bending rigidity...
June 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28577502/influence-of-the-environmental-tonicity-perturbations-on-the-release-of-model-compounds-from-large-unilamellar-vesicles-luvs-a-mechanistic-investigation
#9
Iren Yeeling Wu, Nataša Škalko-Basnet, Massimiliano Pio di Cagno
In this work, the influence of environmental tonicity perturbations on the size and release kinetics of model markers from liposomes (calcein and rhodamine) was investigated. Large unilamellar vesicles (LUVs) were prepared from a mixture composed of organic solvents containing dissolved phosphatidylcholine and phosphate buffered saline (PBS, pH 7.4). Organic phase was removed by rotary evaporation and the obtained liposomal dispersions were extruded to reduce the liposomal sizes to approx. 400 nm. The LUVs were exposed to PBS of different tonicity to induce water migration, and consequently, generate an osmotic pressure on the vesicle membranes...
September 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28409734/intratumoral-delivery-of-bortezomib-impact-on-survival-in-an-intracranial-glioma-tumor-model
#10
Weijun Wang, Hee-Yeon Cho, Rachel Rosenstein-Sisson, Nagore I Marín Ramos, Ryan Price, Kyle Hurth, Axel H Schönthal, Florence M Hofman, Thomas C Chen
OBJECTIVE Glioblastoma (GBM) is the most prevalent and the most aggressive of primary brain tumors. There is currently no effective treatment for this tumor. The proteasome inhibitor bortezomib is effective for a variety of tumors, but not for GBM. The authors' goal was to demonstrate that bortezomib can be effective in the orthotopic GBM murine model if the appropriate method of drug delivery is used. In this study the Alzet mini-osmotic pump was used to bring the drug directly to the tumor in the brain, circumventing the blood-brain barrier; thus making bortezomib an effective treatment for GBM...
April 14, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28371725/age-related-pharmacotherapy-of-attention-deficit-hyperactivity-disorder-in-slovenia-in-children-and-adolescents-a-population-based-study
#11
M Stuhec, I Locatelli
BACKGROUND: There are no data on age-related pharmacotherapy for Attention Deficit Hyperactivity Disorder (ADHD) medication in children and adolescents in the most European countries. The main aim of this paper was to obtain that data for children and adolescents in Slovenia. METHOD: The number of ADHD drug prescriptions per patient was obtained from the health claims data on prescription drugs of the Health Insurance Institute of Slovenia for the study period (2003-2015)...
May 2017: European Psychiatry: the Journal of the Association of European Psychiatrists
https://www.readbyqxmd.com/read/28357656/physiologically-based-pharmacokinetic-and-absorption-modeling-for-osmotic-pump-products
#12
Zhanglin Ni, Arjang Talattof, Jianghong Fan, Eleftheria Tsakalozou, Satish Sharan, Dajun Sun, Hong Wen, Liang Zhao, Xinyuan Zhang
Physiologically based pharmacokinetic (PBPK) and absorption modeling approaches were employed for oral extended-release (ER) drug products based on an osmotic drug delivery system (osmotic pumps). The purpose was to systemically evaluate the in vivo relevance of in vitro dissolution for this type of formulation. As expected, in vitro dissolution appeared to be generally predictive of in vivo PK profiles, because of the unique feature of this delivery system that the in vitro and in vivo release of osmotic pump drug products is less susceptible to surrounding environment in the gastrointestinal (GI) tract such as pH, hydrodynamic, and food effects...
March 29, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28331320/the-complex-of-pamam-oh-dendrimer-with-angiotensin-1-7-prevented-the-disuse-induced-skeletal-muscle-atrophy-in-mice
#13
Valeria Márquez-Miranda, Johanna Abrigo, Juan Carlos Rivera, Ingrid Araya-Durán, Javier Aravena, Felipe Simon, Nicolás Pacheco, Fernando Danilo González-Nilo, Claudio Cabello-Verrugio
Angiotensin (1-7) (Ang-(1-7)) is a bioactive heptapeptide with a short half-life and has beneficial effects in several tissues - among them, skeletal muscle - by preventing muscle atrophy. Dendrimers are promising vehicles for the protection and transport of numerous bioactive molecules. This work explored the use of a neutral, non-cytotoxic hydroxyl-terminated poly(amidoamine) (PAMAM-OH) dendrimer as an Ang-(1-7) carrier. Bioinformatics analysis showed that the Ang-(1-7)-binding capacity of the dendrimer presented a 2:1 molar ratio...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28295720/dual-phase-separation-in-a-semiconfined-system-monodispersed-heterogeneous-block-copolymer-membranes-for-cell-encoding-and-patterning
#14
Xiuyu Wang, Xueyan Feng, Guiping Ma, Di Zhang, Yahong Chai, Maofa Ge, Li Yao
Block copolymers (BCPs) have the capacity to self-assemble into a myriad of well-defined aggregate structures, offering great promise for the construction of drug delivery, photolithographic templates, and complex nanoscale assemblies. A uniqueness of these materials is their propensity to become kinetically frozen in non-equilibrium states, implying that the process of self-assembly can be utilized to remodel the resulting structures. Here, a new semiconfined system for processing the BCP self-assembly is constructed, in which an unusual dual-phase separation occurs, including nonsolvent-induced microphase separation and osmotically driven macrophase separation, ultimately yielding heterogeneous BCP membranes...
May 2017: Advanced Materials
https://www.readbyqxmd.com/read/28250103/the-nematocyst-s-sting-is-driven-by-the-tubule-moving-front
#15
Sinwook Park, Gadi Piriatinskiy, Dan Zeevi, Jonathan Ben-David, Gilad Yossifon, Uri Shavit, Tamar Lotan
The nematocyst is the explosive injection system of the phylum Cnidaria, and is one of the fastest delivery systems found in Nature. Exploring its injection mechanism is key for understanding predator-prey interactions and protection against jellyfish stinging. Here we analyse the injection of jellyfish nematocysts and ask how the build-up of the poly-γ-glutamate (pγGlu) osmotic potential inside the nematocyst drives its discharge. To control the osmotic potential, we used a two-channel microfluidic system to direct the elongating nematocyst tubule through oil, where no osmotic potential can develop, while keeping the nematocyst capsule in water at all times...
March 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28197586/determination-of-the-temperature-dependent-cell-membrane-permeabilities-using-microfluidics-with-integrated-flow-and-temperature-control
#16
Cifeng Fang, Fujun Ji, Zhiquan Shu, Dayong Gao
We developed an integrated microfluidic platform for instantaneous flow and localized temperature control. The platform consisted of a flow-focusing region for sample delivery and a cross-junction region embedded with a microheater for cell trapping and localized temperature control by using an active feedback control system. We further used it to measure the membrane transport properties of Jurkat cells, including the osmotically inactive cell volume (Vb) and cell membrane permeabilities to water (Lp) and to cryoprotective agent (CPA) solutions (dimethyl sulfoxide (DMSO) in this study) (PS) at various temperatures (room temperature, 30 °C, and 37 °C)...
February 15, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28187046/effect-of-hydroxyethyl-starch-priming-on-the-systemic-inflammatory-response-and-lung-edema-following-cardiopulmonary-bypass-in-a-rat-model
#17
Yutaka Fujii, Takayuki Tanabe, Tsubasa Yamashiro, Mikiyasu Shirai, Yoshiaki Takewa, Eisuke Tatsumi
Cardiopulmonary bypass (CPB) preserves patients' lives during open heart surgery by providing sufficient oxygen delivery and blood supply to vital organs. However, previous studies have suggested that the interaction of hemodilution and vascular hyperpermeability induces tissue edema and an inflammatory response during CPB. In this study, we hypothesized that suppression of the systemic inflammatory response and tissue edema during CPB by a plasma substitute (hydroxyethyl starch: HES).Rats (450-500 g) were divided into a SHAM group (n=5), a Ringer's acetate CPB group (n=7), and an HES CPB group (n=7)...
February 7, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28123994/development-evaluation-and-influence-of-formulation-and-process-variables-on-in-vitro-performance-of-oral-elementary-osmotic-device-of-atenolol
#18
N Arjun, D Narendar, K Sunitha, K Harika, B Nagaraj
PURPOSE: Osmotic devices are the most promising strategy-based systems for controlled drug delivery. By optimizing formulation and processing parameters, possible to develop osmotic systems to deliver drugs at predetermined rate with high in vitro-in vivo correlation. The aim of the present investigation was to develop an oral elementary osmotic pump (EOP) of atenolol with zero-order or near zero-order drug release profile. MATERIALS AND METHODS: Differential scanning calorimetry and Fourier transform-infrared spectroscopy studies did not show any evidence of interaction between the drug and excipients...
October 2016: International Journal of Pharmaceutical Investigation
https://www.readbyqxmd.com/read/28034583/differential-hypertensive-protease-expression-in-the-thoracic-versus-abdominal-aorta
#19
Jean Marie Ruddy, Adam W Akerman, Denise Kimbrough, Elizabeth K Nadeau, Robert E Stroud, Rupak Mukherjee, John S Ikonomidis, Jeffrey A Jones
BACKGROUND: Hypertension (HTN), which is a major risk factor for cardiovascular morbidity and mortality, can drive pathologic remodeling of the macro- and microcirculation. Patterns of aortic pathology differ, however, suggesting regional heterogeneity of the pressure-sensitive protease systems triggering extracellular matrix remodeling in the thoracic (TA) and abdominal aortas (AA). This study tested the hypothesis that the expression of two major protease systems (matrix metalloproteinases [MMPs] and cathepsins) in the TA and AA would be differentially affected with HTN...
December 26, 2016: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28017887/controlled-nanoparticle-release-from-a-hydrogel-by-dna-mediated-particle-disaggregation
#20
C Nowald, B T Käsdorf, O Lieleg
For many pharmaceutical applications, it is important that different drugs are present in the human body at distinct time points. Typically, this is achieved by a sequential administration of different therapeutic agents. A much easier alternative would be to develop a drug delivery system containing a whole set of medically active compounds which are liberated in an orchestrated and controlled manner. Yet, such a controlled, sequential release of drugs from a carrier system that can be used in a physiological situation is difficult to achieve...
December 23, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
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