Search results for " DRUG DELIVERY."
showing 10 items of 182 documents
Polysorbate-80 coating enhances uptake of polybutylcyanoacrylate (PBCA)-nanoparticles by human and bovine primary brain capillary endothelial cells
2000
Certain drugs such as dalargin, loperamide or tubocurarine are not transported across the blood-brain barrier (BBB) and therefore exhibit no effects on the central nervous system. However, effects on the central nervous system can be observed when these drugs are loaded onto polybutylcyanoacrylate (PBCA)-nanoparticles and coated with polysorbate 80. The mechanism by which these complexed nanoparticles cross the BBB and exhibit their effects has not been elucidated. Cultured microvessel brain endothelial cells of human and bovine origin were used as an in vitro model for the BBB to gain further insight into the mechanism of uptake of nanoparticles. With cells from these species we were able …
Valence Topological Charge-Transfer Indices for Dipole Moments
2003
Valence topological charge-transfer (CT) indices are applied to the calculation of dipole moments. The dipole moments calculated by algebraic and vector semisums of the CT indices are defined. The combination of the CT indices allows the estimation of the dipole moments. The model is generalized for molecules with heteroatoms. The ability of the indices for the description of the molecular charge distribution is established by comparing them with the dipole moment of the valence-isoelectronic series of benzene and styrene. Two CT indices, μ v e c (vector semisum of vertex-pair dipole moments) and μ V v e c (valence μ v e c ) are proposed. μ v e c and μ V v e c are important for the predicti…
Assessing the Effects of VEGF Releasing Microspheres on the Angiogenic and Foreign Body Response to a 3D Printed Silicone-Based Macroencapsulation De…
2021
Macroencapsulation systems have been developed to improve islet cell transplantation but can induce a foreign body response (FBR). The development of neovascularization adjacent to the device is vital for the survival of encapsulated islets and is a limitation for long-term device success. Previously we developed additive manufactured multi-scale porosity implants, which demonstrated a 2.5-fold increase in tissue vascularity and integration surrounding the implant when compared to a non-textured implant. In parallel to this, we have developed poly(ε-caprolactone-PEG-ε-caprolactone)-b-poly(L-lactide) multiblock copolymer microspheres containing VEGF, which exhibited continued release of bioa…
Surface Modification of Nanoparticles and Nanovesicles via Click-Chemistry
2019
Surface modification of nanocarriers offers the possibility of targeted drug delivery, which is of major interest in modern pharmaceutical science. Click-chemistry affords an easy and fast way to modify the surface with targeting structures under mild reaction conditions. Here we describe our current method for the post-preparational surface modification of multifunctional sterically stabilized (stealth) liposomes via copper-catalyzed azide-alkyne cycloaddition (CuAAC) and inverse electron demand Diels-Alder norbornene-tetrazine cycloaddition (IEDDA). We emphasize the use of these in a one-pot orthogonal reaction for deep investigation on stability and targeting of nanocarriers. As the prod…
2014
In the pathogenesis of Alzheimer’s disease (AD) the homeostasis of amyloid precursor protein (APP) processing in the brain is impaired. The expression of the competing proteases ADAM10 (a disintegrin and metalloproteinase 10) and BACE-1 (beta site APP cleaving enzyme 1) is shifted in favor of the A-beta generating enzyme BACE-1. Acitretin–a synthetic retinoid–e.g., has been shown to increase ADAM10 gene expression, resulting in a decreased level of A-beta peptides within the brain of AD model mice and thus is of possible value for AD therapy. A striking challenge in evaluating novel therapeutically applicable drugs is the analysis of their potential to overcome the blood-brain barrier (BBB)…
Cholesterol-Inulin Conjugates for Efficient SN38 Nuclear Delivery: Nanomedicines for Precision Cancer Therapy
2022
An amphiphilic inulin-thiocholesterol conjugate (INU-Cys-TC) was strategically designed as a biodegradable core-shell nanocarrier of 7-ethyl-10-hydroxy-camptothecin (SN38) to enhance its solubility and stability in aqueous media, thus exploiting its brilliant anticancer effect. INU-Cys-TC was designed to have the hydrophilic inulin backbone (external shell) partially functionalized with hydrophobic thiocholesterol moieties (internal core) through a biodegradable disulfide bond due to cysteamine bridges. Thiocholesterol moieties impair redox-sensitive self-assembling abilities, yielding to nano-sized micelles in aqueous media capable of efficiently encapsulating a high amount of SN38 (DL = 8…
Retinal neurodegeneration and an innovative nanostructured approach in an iron overload in vivo model
2020
CURCUMIN-LOADED LIPID NANOSTRUCTURES AS DRUG DELIVERY SYSTEMS.
2009
Casein-loaded proteoliposomes: Drug Delivery Systems and Potential Inhibitors in Aβ1-40 Fibrillogenesis
2018
Alzheimer's disease (AD) represents the most common cause of dementia worldwide. The early symptom is usually a short-term memory loss, followed by symptoms including problems with language, disorientation, mood swings, loss of motivation, not managing self-care, and behavioral issues, until loss of body functions and, ultimately, death. The cause of AD is poorly understood and the diagnosis is complex. One of the main AD hallmarks is the extracellular deposition in brain tissue of proteinaceous amyloid plaques, composed by well-ordered fibrillary aggregates of the amyloid β-peptide (Aβ). The Aβ aggregation process follows typical nucleation-polymerization kinetics, characterized by structu…