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Convection enhanced delivery

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https://www.readbyqxmd.com/read/28524852/surface-chemistry-governs-cellular-tropism-of-nanoparticles-in-the-brain
#1
Eric Song, Alice Gaudin, Amanda R King, Young-Eun Seo, Hee-Won Suh, Yang Deng, Jiajia Cui, Gregory T Tietjen, Anita Huttner, W Mark Saltzman
Nanoparticles are of long-standing interest for the treatment of neurological diseases such as glioblastoma. Most past work focused on methods to introduce nanoparticles into the brain, suggesting that reaching the brain interstitium will be sufficient to ensure therapeutic efficacy. However, optimized nanoparticle design for drug delivery to the central nervous system is limited by our understanding of their cellular deposition in the brain. Here, we investigated the cellular fate of poly(lactic acid) nanoparticles presenting different surface chemistries, after administration by convection-enhanced delivery...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28493093/insights-from-mathematical-modeling-for-convection-enhanced-intraputamenal-delivery-of-gdnf
#2
Elena Belova, Christopher L Shaffer, Patrick E Trapa
Glial cell line-derived neurotrophic factor (GDNF) is a potential therapy for Parkinson's disease (PD) promoting survival and functional recovery of dopaminergic neurons when delivered to the degenerated striatum. To study the aspects of intraputamenal delivery of GDNF, a mathematical model of recombinant methionyl human GDNF (r-metHuGDNF) convection in the human putamen has been developed. The convection-enhanced delivery infusions of r-metHuGDNF were simulated at rates up to 5 μL/min. The high-rate infusions (≥1 μL/min) permit rapid and uniform distribution of drug with up to 75% of the distribution volume having a concentration within 5% of the infusate concentration...
May 11, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28478918/backflow-free-catheters-for-efficient-and-safe-convection-enhanced-delivery-of-therapeutics
#3
Eric Lueshen, Kevin Tangen, Ankit I Mehta, Andreas Linninger
Convection-enhanced delivery (CED) is an invasive drug delivery technique used to target specific regions of the brain for the treatment of cancer and neurodegenerative diseases while bypassing the blood-brain barrier. In order to prevent the possibility of backflow, low volumetric flow rates are applied which limit the achievable drug distribution volumes from CED. This can render CED treatment ineffective since a small convective flow produces narrow drug distribution inside the treatment region. Novel catheter designs and CED protocols are needed to improve the drug distribution inside the treatment region...
May 3, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28418846/drug-carrying-microbubbles-as-a-theranostic-tool-in-convection-enhanced-delivery-for-brain-tumor-therapy
#4
Pin-Yuan Chen, Chih-Kuang Yeh, Po-Hung Hsu, Chung-Yin Lin, Chiung-Yin Huang, Kuo-Chen Wei, Hao-Li Liu
Convection-enhanced delivery (CED) is a promising technique for infusing a therapeutic agent through a catheter with a pressure gradient to create bulk flow for improving drug spread into the brain. So far, gadopentetate dimeglumine (Gd-DTPA) is the most commonly applied surrogate agent for predicting drug distribution through magnetic resonance imaging (MRI). However, Gd-DTPA provides only a short observation duration, and concurrent infusion provides an indirect measure of the exact drug distribution. In this study, we propose using microbubbles as a contrast agent for MRI monitoring, and evaluate their use as a drug-carrying vehicle to directly monitor the infused drug...
March 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28299724/convection-enhanced-delivery
#5
REVIEW
A M Mehta, A M Sonabend, J N Bruce
Convection-enhanced delivery (CED) is a promising technique that generates a pressure gradient at the tip of an infusion catheter to deliver therapeutics directly through the interstitial spaces of the central nervous system. It addresses and offers solutions to many limitations of conventional techniques, allowing for delivery past the blood-brain barrier in a targeted and safe manner that can achieve therapeutic drug concentrations. CED is a broadly applicable technique that can be used to deliver a variety of therapeutic compounds for a diversity of diseases, including malignant gliomas, Parkinson's disease, and Alzheimer's disease...
April 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28291423/preclinical-evaluation-of-convection-enhanced-delivery-of-liposomal-doxorubicin-to-treat-pediatric-diffuse-intrinsic-pontine-glioma-and-thalamic-high-grade-glioma
#6
A Charlotte P Sewing, Tonny Lagerweij, Dannis G van Vuurden, Michaël H Meel, Susanna J E Veringa, Angel M Carcaboso, Pieter J Gaillard, W Peter Vandertop, Pieter Wesseling, David Noske, Gertjan J L Kaspers, Esther Hulleman
OBJECTIVE Pediatric high-grade gliomas (pHGGs) including diffuse intrinsic pontine gliomas (DIPGs) are primary brain tumors with high mortality and morbidity. Because of their poor brain penetrance, systemic chemotherapy regimens have failed to deliver satisfactory results; however, convection-enhanced delivery (CED) may be an alternative mode of drug delivery. Anthracyclines are potent chemotherapeutics that have been successfully delivered via CED in preclinical supratentorial glioma models. This study aims to assess the potency of anthracyclines against DIPG and pHGG cell lines in vitro and to evaluate the efficacy of CED with anthracyclines in orthotopic pontine and thalamic tumor models...
May 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28279797/convection-enhanced-delivery-of-cisplatin-loaded-brain-penetrating-nanoparticles-cures-malignant-glioma-in-rats
#7
Clark Zhang, Elizabeth A Nance, Panagiotis Mastorakos, Jane Chisholm, Sneha Berry, Charles Eberhart, Betty Tyler, Henry Brem, Jung Soo Suk, Justin Hanes
Glioblastoma multiforme (GBM) is highly invasive and uniformly fatal, with median survival<20months after diagnosis even with the most aggressive treatment that includes surgery, radiation, and systemic chemotherapy. Cisplatin is a particularly potent chemotherapeutic agent, but its use to treat GBM is limited by severe systemic toxicity and inefficient penetration of brain tumor tissue even when it is placed directly in the brain within standard delivery systems. We describe the development of cisplatin-loaded nanoparticles that are small enough (70nm in diameter) to move within the porous extracellular matrix between cells and that possess a dense polyethylene glycol (PEG) corona that prevents them from being trapped by adhesion as they move through the brain tumor parenchyma...
March 7, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28260886/convection-enhanced-delivery-of-panobinostat-lbh589-loaded-pluronic-nano-micelles-prolongs-survival-in-the-f98-rat-glioma-model
#8
W G Singleton, A M Collins, A S Bienemann, C L Killick-Cole, H R Haynes, D J Asby, C P Butts, M J Wyatt, N U Barua, S S Gill
BACKGROUND: The pan-histone deacetylase inhibitor panobinostat is a potential therapy for malignant glioma, but it is water insoluble and does not cross the blood-brain barrier when administered systemically. In this article, we describe the in vitro and in vivo efficacy of a novel water-soluble nano-micellar formulation of panobinostat designed for administration by convection enhanced delivery (CED). MATERIALS AND METHODS: The in vitro efficacy of panobinostat-loaded nano-micelles against rat F98, human U87-MG and M059K glioma cells and against patient-derived glioma stem cells was measured using a cell viability assay...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28247160/convection-enhanced-delivery-of-a-hydrophilic-nitrosourea-ameliorates-deficits-and-suppresses-tumor-growth-in-experimental-spinal-cord-glioma-models
#9
Shogo Ogita, Toshiki Endo, Shinichiro Sugiyama, Ryuta Saito, Tomoo Inoue, Akira Sumiyoshi, Hiroi Nonaka, Ryuta Kawashima, Yukihiko Sonoda, Teiji Tominaga
BACKGROUND: Convection-enhanced delivery (CED) is a technique allowing local infusion of therapeutic agents into the central nervous system, circumventing the blood-brain or spinal cord barrier. OBJECTIVE: To evaluate the utility of nimustine hydrochloride (ACNU) CED in controlling tumor progression in an experimental spinal cord glioma model. METHODS: Toxicity studies were performed in 42 rats following the administration of 4 μl of ACNU CED into the mid-thoracic spinal cord at concentrations ranging from 0...
May 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28208698/advances-in-molecular-imaging-of-locally-delivered-targeted-therapeutics-for-central-nervous-system-tumors
#10
REVIEW
Umberto Tosi, Christopher S Marnell, Raymond Chang, William C Cho, Richard Ting, Uday B Maachani, Mark M Souweidane
Thanks to the recent advances in the development of chemotherapeutics, the morbidity and mortality of many cancers has decreased significantly. However, compared to oncology in general, the field of neuro-oncology has lagged behind. While new molecularly targeted chemotherapeutics have emerged, the impermeability of the blood-brain barrier (BBB) renders systemic delivery of these clinical agents suboptimal. To circumvent the BBB, novel routes of administration are being applied in the clinic, ranging from intra-arterial infusion and direct infusion into the target tissue (convection enhanced delivery (CED)) to the use of focused ultrasound to temporarily disrupt the BBB...
February 8, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28155074/mathematical-modelling-of-convection-enhanced-delivery-of-carmustine-and-paclitaxel-for-brain-tumour-therapy
#11
Wenbo Zhan, Davis Yohanes Arifin, Timothy Ky Lee, Chi-Hwa Wang
PURPOSE: Convection enhanced delivery (CED) is a promising method of anticancer treatment to bypass the blood-brain barrier. This paper is aimed to study drug transport under different CED operating conditions. METHODS: The convection enhanced delivery of chemotherapeutics to an intact and a remnant brain tumour after resection is investigated by means of mathematical modelling of the key physical and physiological processes of drug transport. Realistic models of brain tumour and its holding tissue are reconstructed from magnetic resonance images...
February 2, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28114947/evaluation-of-a-novel-sodium-borocaptate-containing-unnatural-amino-acid-as-a-boron-delivery-agent-for-neutron-capture-therapy-of-the-f98-rat-glioma
#12
Gen Futamura, Shinji Kawabata, Naosuke Nonoguchi, Ryo Hiramatsu, Taichiro Toho, Hiroki Tanaka, Shin-Ichiro Masunaga, Yoshihide Hattori, Mitsunori Kirihata, Koji Ono, Toshihiko Kuroiwa, Shin-Ichi Miyatake
BACKGROUND: Boron neutron capture therapy (BNCT) is a unique particle radiation therapy based on the nuclear capture reactions in boron-10. We developed a novel boron-10 containing sodium borocaptate (BSH) derivative, 1-amino-3-fluorocyclobutane-1-carboxylic acid (ACBC)-BSH. ACBC is a tumor selective synthetic amino acid. The purpose of this study was to assess the biodistribution of ACBC-BSH and its therapeutic efficacy following Boron Neutron Capture Therapy (BNCT) of the F98 rat glioma...
January 23, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28101766/crossing-the-blood-brain-barrier-recent-advances-in-drug-delivery-to-the-brain
#13
Mayur M Patel, Bhoomika M Patel
CNS disorders are on the rise despite advancements in our understanding of their pathophysiological mechanisms. A major hurdle to the treatment of these disorders is the blood-brain barrier (BBB), which serves as an arduous janitor to protect the brain. Many drugs are being discovered for CNS disorders, which, however fail to enter the market because of their inability to cross the BBB. This is a pronounced challenge for the pharmaceutical fraternity. Hence, in addition to the discovery of novel entities and drug candidates, scientists are also developing new formulations of existing drugs for brain targeting...
February 2017: CNS Drugs
https://www.readbyqxmd.com/read/28013405/production-and-quality-control-assessment-of-a-glp-grade-immunotoxin-d2c7-scdsfv-pe38kdel-for-a-phase-i-ii-clinical-trial
#14
Vidyalakshmi Chandramohan, Charles N Pegram, Hailan Piao, Scott E Szafranski, Chien-Tsun Kuan, Ira H Pastan, Darell D Bigner
D2C7-(scdsFv)-PE38KDEL (D2C7-IT) is a novel recombinant Pseudomonas exotoxin A-based immunotoxin (IT), targeting both wild-type epidermal growth factor receptor (EGFRwt) and mutant EGFR variant III (EGFRvIII) proteins overexpressed in glioblastomas. Initial pre-clinical testing demonstrated the anti-tumor efficacy of D2C7-IT against orthotopic glioblastoma xenograft models expressing EGFRwt, EGFRvIII, or both EGFRwt and EGFRvIII. A good laboratory practice (GLP) manufacturing process was developed to produce sufficient material for a phase I/II clinical trial...
April 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27980285/convection-enhanced-delivery-of-therapeutics-for-malignant-gliomas
#15
Ryuta Saito, Teiji Tominaga
Convection-enhanced delivery (CED) circumvents the blood-brain barrier by delivering agents directly into the tumor and surrounding parenchyma. CED can achieve large volumes of distribution by continuous positive-pressure infusion. Although promising as an effective drug delivery method in concept, the administration of therapeutic agents via CED is not without challenges. Limitations of distribution remain a problem in large brains, such as those of humans. Accurate and consistent delivery of an agent is another challenge associated with CED...
January 15, 2017: Neurologia Medico-chirurgica
https://www.readbyqxmd.com/read/27924163/highly-effective-auger-electron-therapy-in-an-orthotopic-glioblastoma-xenograft-model-using-convection-enhanced-delivery
#16
Helge Thisgaard, Bo Halle, Charlotte Aaberg-Jessen, Birgitte Brinkmann Olsen, Anne Sofie Nautrup Therkelsen, Johan Hygum Dam, Niels Langkjær, Sune Munthe, Kjell Någren, Poul Flemming Høilund-Carlsen, Bjarne Winther Kristensen
Glioblastoma, the most common and malignant primary brain tumor, always recurs after standard treatment. Therefore, promising new therapeutic approaches are needed. Short-range Auger-electron-emitters carry the ability of causing highly damaging radiation effects in cells. The aim of this study was to test the effect of [(125)I]5-Iodo-2'-deoxyuridine ((125)I-UdR, a radioactive Auger-electron-emitting thymidine analogue) Auger-therapy on immature glioblastoma spheroid cultures and orthotopic xenografted glioblastoma-bearing rats, the latter by means of convection-enhanced delivery (CED)...
2016: Theranostics
https://www.readbyqxmd.com/read/27921285/spatiotemporal-distribution-modeling-of-pet-tracer-uptake-in-solid-tumors
#17
Madjid Soltani, Mostafa Sefidgar, Hossein Bazmara, Michael E Casey, Rathan M Subramaniam, Richard L Wahl, Arman Rahmim
OBJECTIVE: Distribution of PET tracer uptake is elaborately modeled via a general equation used for solute transport modeling. This model can be used to incorporate various transport parameters of a solid tumor such as hydraulic conductivity of the microvessel wall, transvascular permeability as well as interstitial space parameters. This is especially significant because tracer delivery and drug delivery to solid tumors are determined by similar underlying tumor transport phenomena, and quantifying the former can enable enhanced prediction of the latter...
February 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/27854097/optimizing-the-delivery-of-antineoplastic-therapies-to-the-central-nervous-system
#18
REVIEW
Jarushka Naidoo, Hardik Panday, Sadhana Jackson, Stuart A Grossman
Despite significant advances in the treatment of systemic cancers, progress in the treatment of primary brain tumors has been quite modest. In addition, an increasing proportion of patients with systemic cancers are presenting with brain-only metastases. These observations highlight the critical role that the blood-brain barrier plays in preventing antineoplastic therapies from reaching the central nervous system in therapeutic concentrations. This review describes the anatomy of the blood-brain barrier and currently available methods to quantify the entry of therapeutic compounds into the brain...
November 15, 2016: Oncology (Williston Park, NY)
https://www.readbyqxmd.com/read/27824313/evidence-of-a-metabolic-reserve-in-the-skeletal-muscle-of-elderly-people
#19
Gwenael Layec, Joel D Trinity, Corey R Hart, Yann Le Fur, Jacob R Sorensen, Eun-Kee Jeong, Russell S Richardson
The purpose of the present study was to determine whether mitochondrial function is limited by O2 availability or the intrinsic capacity of mitochondria to synthesize ATP in elderly individuals. To this aim, we examined, in comparison to free-flow conditions (FF), the effect of superimposing reactive hyperemia (RH), induced by a period of brief ischemia during the last min of exercise, on O2 availability and mitochondrial function in the calf muscle. 12 healthy, untrained, elderly subjects performed dynamic plantar flexion exercise and phosphorus magnetic resonance spectroscopy ((31)P-MRS), near-infrared spectroscopy (NIRS), and Doppler ultrasound were used to assess muscle metabolism and peripheral hemodynamics...
November 6, 2016: Aging
https://www.readbyqxmd.com/read/27675051/convection-enhanced-delivery-of-nanoparticle-encapsulated-radiosensitizers-for-treatment-of-malignant-glioma
#20
C D Corso, A R King, W M Saltzman, R S Bindra
No abstract text is available yet for this article.
October 1, 2016: International Journal of Radiation Oncology, Biology, Physics
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