Read by QxMD icon Read

Inner ear dexamethasone delivery

S K Plontke, G Götze, T Rahne, A Liebau
Local drug application to the inner ear offers a number of advantages over systemic delivery. Local drug therapy currently encompasses extracochlear administration (intratympanic injection); intracochlear administration, particularly for gene and stem cell therapy; as well as various combinations with auditory neurosensory prostheses, either evaluated in preclinical or clinical studies, or off-label. To improve rehabilitation with cochlear implants (CI), one focus is the development of drug-releasing electrode carriers, e...
October 18, 2016: HNO
Nezamoddin Berjis, Saeed Soheilipour, Alireza Musavi, Seyed Mostafa Hashemi
BACKGROUND: During the past years various drugs have been used for sudden sensorineural hearing loss (SSNHL) treatment including steroids that are shown to be beneficial. Directed delivery of high doses of steroids into the inner ear is suggested for its potential and known as intratympanic steroids therapy (IST). Despite the use of dexamethasone and methylprednisolone as the traditional treatments, there are still debates about the optimal dosage, preferred drug, and the route of administration...
2016: Advanced Biomedical Research
Douglas Sidell, Jonette A Ward, Angad Pordal, Carson Quimby, Michel Nassar, Daniel I Choo
OBJECTIVES: High dose antivirals have been shown to cause hearing loss when applied via the intratympanic route. The aim of this study was to determine if a combination therapy using dexamethasone (DXA) with either Cidofovir (CDV) or Ganciclovir (GCV), in solution or in PLGA-PEG-PLGA (PPP) hydrogel, is innocuous to the inner ear. METHODS: Cytomegalovirus (CMV)-free guinea pigs were separated into four principal study groups and treated via intratympanic injection (IT) of CDV/DXA solution, CDV/DXA Hydrogel, GCV/DXA solution and GCV/DXA hydrogel...
May 2016: International Journal of Pediatric Otorhinolaryngology
M Gehrke, J Sircoglou, D Gnansia, G Tourrel, J-F Willart, F Danede, E Lacante, C Vincent, F Siepmann, J Siepmann
A new type of advanced drug delivery systems is proposed: Miniaturized implants, which can be placed into tiny holes drilled into (or close to) the oval window. They consist of two parts: 1) A cylinder, which is inserted into the hole crossing the oval window. The cylinder (being longer than the depth of the hole) is partly located within the inner ear and surrounded by perilymph. This provides direct access to the target site, and at the same time assures implant fixation. 2) A cuboid, which is located in the middle ear, serving as a drug reservoir...
July 25, 2016: International Journal of Pharmaceutics
Dehong Yu, Changling Sun, Zhaozhu Zheng, Xueling Wang, Dongye Chen, Hao Wu, Xiaoqin Wang, Fuxin Shi
Minimally invasive delivery and sustained release of therapeutics to the inner ear are of importance to the medical treatment of inner ear disease. In this study, the injectable silk fibroin-polyethylene glycol (Silk-PEG) hydrogel was investigated as a drug delivery carrier to deliver poorly soluble micronized dexamethasone (mDEX) to the inner ear of guinea pigs. Encapsulation of mDEX with a loading up to 5% (w/v) did not significantly change the silk gelation time, and mDEX were evenly distributed in the PEG-Silk hydrogel as visualized by SEM...
April 30, 2016: International Journal of Pharmaceutics
Changling Sun, Xueling Wang, Dongye Chen, Xin Lin, Dehong Yu, Hao Wu
Ototoxicity is one of the most important adverse effects of cisplatin chemotherapy. As a common treatment of acute sensorineural hearing loss, systemic administration of steroids was demonstrated ineffective against cisplatin-induced hearing loss (CIHL) in published studies. The current study aimed to evaluate the potential protective effect of dexamethasone (DEX) encapsulated in polyethyleneglycol-coated polylactic acid (PEG-PLA) nanoparticles (DEX-NPs) against cisplatin-induced hearing loss following systemic administration...
April 21, 2016: Neuroscience Letters
Naila El Kechai, Elisabeth Mamelle, Yann Nguyen, Nicolas Huang, Valérie Nicolas, Pierre Chaminade, Stéphanie Yen-Nicolaÿ, Claire Gueutin, Benjamin Granger, Evelyne Ferrary, Florence Agnely, Amélie Bochot
The inner ear is one of the most challenging organs for drug delivery, mainly because of the blood-perilymph barrier. Therefore, local rather than systemic drug delivery methods are being developed for inner ear therapy. In this work, we have evaluated the benefit of a hyaluronic acid liposomal gel for sustained delivery of a corticoid to the inner ear after local injection into the middle ear in a guinea pig model. The liposomal gel was easily injectable as a result of the shear-thinning behavior of hyaluronic acid...
March 28, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
M Gehrke, J Sircoglou, C Vincent, J Siepmann, F Siepmann
Silicone-based drug delivery systems offer a great potential to improve the therapeutic efficacy and safety of a large variety of medical treatments, e.g. allowing for local long-term delivery of active agents to the inner ear. Different formulation parameters can be varied to adjust desired drug release kinetics. However, often only qualitative information is available on their effects, and product optimization is cumbersome. The aim of this study was to provide a quantitative analysis, allowing also for theoretical predictions of the impact of the device design on system performance...
March 2016: European Journal of Pharmaceutics and Biopharmaceutics
Julie Sircoglou, Maria Gehrke, Meryem Tardivel, Florence Siepmann, Juergen Siepmann, Christophe Vincent
HYPOTHESIS: The purpose of this study was to develop a new strategy to deliver drugs to the inner ear from dexamethasone (DXM)-loaded silicone implants and to evaluate the distribution of the drug in the cochlea with confocal microscopy. BACKGROUND: Systemic drug administration for the treatment of inner ear disorders is tricky because of the blood-cochlear barrier, a difficult anatomical access, the small size of the cochlea, and can cause significant adverse effects...
September 2015: Otology & Neurotology
Ya Liu, Claude Jolly, Susanne Braun, Thomas Stark, Elias Scherer, Stefan K Plontke, Jan Kiefer
Cochlear implants have been widely used for patients with profound hearing loss and partial deafness. Residual low-frequency hearing, however, may deteriorate due to insertion trauma and tissue response around the electrode array. The present study investigated in vitro and in vivo release of dexamethasone from silicone used for cochlear implant electrode carriers. The in vitro experiment involved an apparatus simulating the inner ear fluid environment in humans. Release from two sizes of silicone films (200 µm × 1 mm × 10 mm and 500 µm × 1 mm × 10 mm), each loaded with 2 % dexamethasone, and was measured for 24 weeks...
July 2016: European Archives of Oto-rhino-laryngology
Mareike Hütten, Anandhan Dhanasingh, Roland Hessler, Timo Stöver, Karl-Heinz Esser, Martin Möller, Thomas Lenarz, Claude Jolly, Jürgen Groll, Verena Scheper
Fibrous tissue growth and loss of residual hearing after cochlear implantation can be reduced by application of the glucocorticoid dexamethasone-21-phosphate-disodium-salt (DEX). To date, sustained delivery of this agent to the cochlea using a number of pharmaceutical technologies has not been entirely successful. In this study we examine a novel way of continuous local drug application into the inner ear using a refillable hydrogel functionalized silicone reservoir. A PEG-based hydrogel made of reactive NCO-sP(EO-stat-PO) prepolymers was evaluated as a drug conveying and delivery system in vitro and in vivo...
2014: PloS One
Stefan K Plontke, Alexander Glien, Torsten Rahne, Karsten Mäder, Alec N Salt
OBJECTIVE: To evaluate the feasibility and hearing outcome of a biocompatible degradable dexamethasone releasing implant for continuous drug delivery to the round window membrane in patients with idiopathic sudden sensorineural hearing loss (ISSHL) and insufficient recovery after systemic high dose glucocorticoid therapy. PATIENTS: Five patients with profound or moderate-to-severe hearing loss after systemic high-dose prednisolone for ISSHL received local salvage therapy with a controlled release dexamethasone implant in the middle ear...
August 2014: Otology & Neurotology
Laura Astolfi, Valeria Guaran, Nicola Marchetti, Elena Olivetto, Edi Simoni, Alberto Cavazzini, Claude Jolly, Alessandro Martini
Anti-inflammatory drugs can minimize the trauma and inflammation in the inner ear caused by cochlear implantation surgery. For this reason, much effort has recently been devoted to finding the best way to administer these anti-inflammatory drugs for a prolonged time and in a personalized dosage. One solution is constructing an electrode with a dispenser filled with anti-inflammatory drugs with a dosage adapted to suit each new cochlear implant user. The purpose of this study was to measure in vitro, by high-performance liquid chromatography-mass spectrometry assay, the amount of dexamethasone released in 78 days in a physiological solution by a filled dispenser...
February 2014: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Sara A Tokarz, Jiaqing Pang, Anna Grosz, J Beth Kempton, Dennis R Trune, De-Ann M Pillers
CONCLUSION: Age-related differences in the expression of inflammatory cytokines in the inner ear may contribute to the development of age-related hearing loss (ARHL). OBJECTIVES: ARHL is characterized by tissue remodeling, ischemia, ion homeostasis, and inflammation. Steroid therapy is an otoprotective strategy that likely acts by reducing inflammation. We examined age-related changes in cytokine gene expression in the cochlea of the BALB/cJ mouse model of premature ARHL after systemic or intratympanic steroid delivery...
July 2013: Acta Oto-laryngologica
Amandeep S Grewal, Julian M Nedzelski, Joseph M Chen, Vincent Y W Lin
OBJECTIVE: To investigate glucocorticoid uptake in auditory hair cells following transtympanic versus systemic administration of dexamethasone. STUDY DESIGN: Controlled experimental study. SETTING: Translational science experimental laboratory. METHODS: Swiss-Webster mice were injected with dexamethasone via transtympanic or systemic administration. At 1, 6, or 12 hours post-injection the temporal bones were harvested...
2013: Journal of Otolaryngology—Head & Neck Surgery
Antonina Wrzeszcz, Barbara Dittrich, Daniel Haamann, Pooyan Aliuos, Doris Klee, Ingo Nolte, Thomas Lenarz, Günter Reuter
The insertion of cochlear implants into the inner ear often causes inflammation and fibrosis inside the scala tympani and thus growth of fibrous tissue on the implant surface. This deposition leads to the loss of function in both electrical and laser-based implants. The design of this study was to realize fibroblast growth inhibition by dexamethasone (Dex) released from the base material of the implant [polydimethylsiloxane (PDMS)]. To prevent cell and protein adhesion, the PDMS was coated with a hydrogel layer [star-shaped polyethylene glycol prepolymer (sPEG)]...
February 2014: Journal of Biomedical Materials Research. Part A
Sho Kanzaki, Masato Fujioka, Akimasa Yasuda, Shinsuke Shibata, Masaya Nakamura, Hirotaka James Okano, Kaoru Ogawa, Hideyuki Okano
OBJECTIVE: Systemic steroid injections are used to treat idiopathic sudden-onset sensorineural hearing loss (ISSHL) and some inner ear disorders. Recent studies show that transtympanic (TT) steroid injections are effective for treating ISSHL. As in vivo monitoring of drug delivery dynamics for inner ear is lacking, its time course and dispersion of drugs is unknown. Here, we used a new in vivo imaging system to monitor drug delivery in live mice and to compare drug concentrations over time after TT and systemic injections...
2012: PloS One
Xiaoping Du, Kejian Chen, Satish Kuriyavar, Richard D Kopke, Brian P Grady, David H Bourne, Wei Li, Kenneth J Dormer
HYPOTHESIS: Magnetically susceptible PLGA nanoparticles will effectively target the round window membrane (RWM) for delivery of dexamethasone-acetate (Dex-Ac) to the scala tympani. BACKGROUND: Targeted delivery of therapeutics to specific tissues can be accomplished using different targeting mechanisms. One technology includes iron oxide nanoparticles, susceptible to external magnetic fields. If a nanocomposite composed of biocompatible polymer (PLGA), magnetite, and Dex-Ac can be pulled into and across the mammalian RWM, drug delivery can be enhanced...
January 2013: Otology & Neurotology
Alec N Salt, Jared J Hartsock, Ruth M Gill, Fabrice Piu, Stefan K Plontke
Perilymph pharmacokinetics was investigated by a novel approach, in which solutions containing drug or marker were injected from a pipette sealed into the perilymphatic space of the lateral semi-circular canal (LSCC). The cochlear aqueduct provides the outlet for fluid flow so this procedure allows almost the entire perilymph to be exchanged. After wait times of up to 4 h the injection pipette was removed and multiple, sequential samples of perilymph were collected from the LSCC. Fluid efflux at this site results from cerebrospinal fluid (CSF) entry into the basal turn of scala tympani (ST) so the samples allow drug levels from different locations in the ear to be defined...
December 2012: Journal of the Association for Research in Otolaryngology: JARO
Anne Bohl, Henning W Rohm, Piera Ceschi, Gerrit Paasche, Anne Hahn, Stephan Barcikowski, Thomas Lenarz, Timo Stöver, Hans-Wilhelm Pau, Klaus-Peter Schmitz, Katrin Sternberg
A cochlear implant (CI)-associated local drug delivery system based on dexamethasone (DMS) was developed with the purpose to inhibit the growth of fibrotic tissue which influences the signal transmission from the CI to the neurons of the inner ear. For the realization of a targeted DMS delivery the following concepts were combined: modification of the silicone-based electrode carrier by incorporation of DMS and a DMS-containing polymeric coating chemically attached on the surface of the electrode carrier. It was demonstrated that the coated CI showed a high coating stability in a simulated implantation procedure...
September 2012: Journal of Materials Science. Materials in Medicine
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"