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Thakur NS, Rus I, Sparks E, Agrahari V. Dual stimuli-responsive and sustained drug delivery NanoSensoGel formulation for prevention of cisplatin-induced ototoxicity. J Control Release 2024; 368:66-83. [PMID: 38331002 DOI: 10.1016/j.jconrel.2024.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 02/06/2024] [Indexed: 02/10/2024]
Abstract
Cisplatin (CisPt)-induced ototoxicity (CIO) is delineated as a consequence of CisPt-induced intracellular generation of reactive oxygen species (ROS) which can be circumvented by Bucillamine (BUC; an antioxidant drug with sulfhydryl groups) and Diltiazem (DLT, L-type calcium channel blocker). However, its effective accumulation in the Organ of Corti and cell cytoplasm is desired. Therefore, a biocompatible BUC- and DLT-nanoparticles (NPs)-impregnated dual stimuli-responsive formulation (NanoSensoGel) presented here with ROS- and thermo-responsive properties for the sustained and receptive delivery of drugs. The ROS-responsive polypropylene sulfide- methyl polyethylene glycol-2000 (PPS-mPEG2000) polymer was rationally designed, synthesized, and characterized to fabricate BUC- and DLT-loaded PPS-mPEG2000-NPs (BUC- and DLT-NPs). The fabricated BUC- and DLT-NPs showed efficient cellular uptake, intracellular delivery, ROS responsiveness, and cytoprotective effect which was characterized using cellular internalization, intracellular ROS, mitochondrial superoxide, and Caspase 3/7 assays on the House Ear Institute-Organ of Corti-1 (HEI-OC1) cells. The composite NanoSensoGel (i.e., ROS-responsive BUC- and DLT-NPs suspended in the thermo-responsive hydrogel) present in a sol state at room temperature and turned to gel above 33°C, which could be essential for retaining the formulation at the target site for long-term release. The NanoSensoGel showed sustained release of BUC and DLT following Fickian release diffusion kinetics. Overall, a novel NanoSensoGel formulation developed in this study has demonstrated its great potential in delivering therapeutics in the inner ear for prophylactic treatment of CIO, and associated hearing loss.
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Affiliation(s)
- Neeraj S Thakur
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA
| | - Iulia Rus
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA
| | - Ethan Sparks
- Department of Integrative Biology, Oklahoma State University, Stillwater, OK 74078, USA
| | - Vibhuti Agrahari
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA.
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Micaletti F, Escoffre JM, Kerneis S, Bouakaz A, Galvin JJ, Boullaud L, Bakhos D. Microbubble-assisted ultrasound for inner ear drug delivery. Adv Drug Deliv Rev 2024; 204:115145. [PMID: 38042259 DOI: 10.1016/j.addr.2023.115145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/20/2023] [Accepted: 11/22/2023] [Indexed: 12/04/2023]
Abstract
Treating pathologies of the inner ear is a major challenge. To date, a wide range of procedures exists for administering therapeutic agents to the inner ear, with varying degrees of success. The key is to deliver therapeutics in a way that is minimally invasive, effective, long-lasting, and without adverse effects on vestibular and cochlear function. Microbubble-assisted ultrasound ("sonoporation") is a promising new modality that can be adapted to the inner ear. Combining ultrasound technology with microbubbles in the middle ear can increase the permeability of the round window, enabling therapeutic agents to be delivered safely and effectively to the inner ear in a targeted manner. As such, sonoporation is a promising new approach to treat hearing loss and vertigo. This review summarizes all studies on the delivery of therapeutic molecules to the inner ear using sonoporation.
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Affiliation(s)
- Fabrice Micaletti
- ENT and Cervico-Facial Surgery Department, University Hospital Center of Tours, 2 Boulevard Tonnellé, 37044 Tours, France.
| | | | - Sandrine Kerneis
- ENT and Cervico-Facial Surgery Department, University Hospital Center of Tours, 2 Boulevard Tonnellé, 37044 Tours, France
| | - Ayache Bouakaz
- UMR 1253, iBrain, Université de Tours, Inserm, Tours, France
| | - John J Galvin
- Faculty of medicine, Université de Tours, 10 boulevard Tonnellé, 37044 Tours, France; House Institute Foundation, 2100 W 3rd Street, Suite 111, Los Angeles, CA 90057, USA
| | - Luc Boullaud
- ENT and Cervico-Facial Surgery Department, University Hospital Center of Tours, 2 Boulevard Tonnellé, 37044 Tours, France
| | - David Bakhos
- ENT and Cervico-Facial Surgery Department, University Hospital Center of Tours, 2 Boulevard Tonnellé, 37044 Tours, France; UMR 1253, iBrain, Université de Tours, Inserm, Tours, France; Faculty of medicine, Université de Tours, 10 boulevard Tonnellé, 37044 Tours, France; House Institute Foundation, 2100 W 3rd Street, Suite 111, Los Angeles, CA 90057, USA
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Nguyen TN, Yoo SY, Tangchang W, Lee JY, Son HY, Park JS. Sustained delivery of triamcinolone acetonide from a thermosensitive microemulsion gel system for the treatment of sensorineural hearing loss. Drug Deliv 2023; 30:2242003. [PMID: 37537864 PMCID: PMC10405762 DOI: 10.1080/10717544.2023.2242003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 04/17/2023] [Accepted: 07/03/2023] [Indexed: 08/05/2023] Open
Abstract
Intratympanic administration for the delivery of steroids has been extensively studied but limited because of low permeability of the drug through the row window membrane. Here, to effectively deliver poorly soluble triamcinolone acetonide (TA), microemulsions (ME) were prepared from Capmul MCM (oil), Cremophor RH40 (surfactant), and tetraglycol (cosurfactant) based on solubility studies, emulsifying ability test, and pseudoternary phase diagrams. Microemulsion gel (MEG) was prepared by mixing TA-ME with a poloxamer hydrogel base. The physicochemical properties of ME and MEG formulations were characterized, and the toxicity and oto-protective effectiveness were evaluated in vitro and in vivo. The ME-3 formulation showed a small droplet size (16.5 ± 0.2 nm), narrow PDI (0.067 ± 0.041), and enhanced TA solubility (2619.7 ± 57.6 μg/g). The optimized MEG demonstrated temperature-dependent gelation with a gelation time of 208 ± 10 sec at 37 °C. Slow degradation of the gel matrix sustained release of TA from MEG compared to the ME formulation. Both TA-ME and TA-MEG were found to be nontoxic to NIH3T3 cells at the test concentrations (0 to 5 µg/mL), and biocompatible after intratympanic administration to mice. The incorporation of ME into thermosensitive hydrogels prolonged retention of TA at the site of administration until 6 days. As a consequence, the enhanced drug absorption into the cochlea in TA-MEG group (approximately 2 times higher than other groups) protected hair cells, spiral ganglion neurons, and stria vascular cells from cisplatin-induced damage. Therefore, this injectable TA-loaded MEG is an effective and safe vehicle for the sustained delivery of triamcinolone acetonide into the inner ear.
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Affiliation(s)
- Thu Nhan Nguyen
- College of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon, Republic of Korea
| | - So-Yeol Yoo
- College of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon, Republic of Korea
| | - Warisraporn Tangchang
- College of Veterinary Medicine, Chungnam National University, Yuseong-gu, Daejeon, Republic of Korea
| | - Jae-Young Lee
- College of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon, Republic of Korea
| | - Hwa-Young Son
- College of Veterinary Medicine, Chungnam National University, Yuseong-gu, Daejeon, Republic of Korea
| | - Jeong-Sook Park
- College of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon, Republic of Korea
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Dual Drug Delivery in Cochlear Implants: In Vivo Study of Dexamethasone Combined with Diclofenac or Immunophilin Inhibitor MM284 in Guinea Pigs. Pharmaceutics 2023; 15:pharmaceutics15030726. [PMID: 36986587 PMCID: PMC10058822 DOI: 10.3390/pharmaceutics15030726] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 02/20/2023] [Accepted: 02/21/2023] [Indexed: 02/24/2023] Open
Abstract
Cochlear implants are well established to treat severe hearing impairments. Despite many different approaches to reduce the formation of connective tissue after electrode insertion and to keep electrical impedances low, results are not yet satisfying. Therefore, the aim of the current study was to combine the incorporation of 5% dexamethasone in the silicone body of the electrode array with an additional polymeric coating releasing diclofenac or the immunophilin inhibitor MM284, some anti-inflammatory substances not yet tested in the inner ear. Guinea pigs were implanted for four weeks and hearing thresholds were determined before implantation and after the observation time. Impedances were monitored over time and, finally, connective tissue and the survival of spiral ganglion neurons (SGNs) were quantified. Impedances increased in all groups to a similar extent but this increase was delayed in the groups with an additional release of diclofenac or MM284. Using Poly-L-lactide (PLLA)-coated electrodes, the damage caused during insertion was much higher than without the coating. Only in these groups, connective tissue could extend to the apex of the cochlea. Despite this, numbers of SGNs were only reduced in PLLA and PLLA plus diclofenac groups. Even though the polymeric coating was not flexible enough, MM284 seems to especially have potential for further evaluation in connection with cochlear implantation.
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Mfoafo K, Mittal R, Eshraghi A, Omidi Y, Omidian H. Improved inner ear drug delivery using hydrogel carriers. J Drug Deliv Sci Technol 2023. [DOI: 10.1016/j.jddst.2022.104086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Rongthong T, Qnouch A, Gehrke MM, Danede F, Willart J, Oliveira P, Paccou L, Tourrel G, Stahl P, Verin J, Toulemonde P, Vincent C, Siepmann F, Siepmann J. Long term behavior of dexamethasone-loaded cochlear implants: In vitro & in vivo. Int J Pharm X 2022; 4:100141. [DOI: 10.1016/j.ijpx.2022.100141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/17/2022] [Accepted: 11/19/2022] [Indexed: 11/23/2022] Open
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Nguyen TN, Park JS. Intratympanic drug delivery systems to treat inner ear impairments. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2022. [DOI: 10.1007/s40005-022-00586-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Targeting Nrf2-Mediated Oxidative Stress Response in Traumatic Brain Injury: Therapeutic Perspectives of Phytochemicals. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:1015791. [PMID: 35419162 PMCID: PMC9001080 DOI: 10.1155/2022/1015791] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/22/2021] [Accepted: 03/19/2022] [Indexed: 02/07/2023]
Abstract
Traumatic brain injury (TBI), known as mechanical damage to the brain, impairs the normal function of the brain seriously. Its clinical symptoms manifest as behavioral impairment, cognitive decline, communication difficulties, etc. The pathophysiological mechanisms of TBI are complex and involve inflammatory response, oxidative stress, mitochondrial dysfunction, blood-brain barrier (BBB) disruption, and so on. Among them, oxidative stress, one of the important mechanisms, occurs at the beginning and accompanies the whole process of TBI. Most importantly, excessive oxidative stress causes BBB disruption and brings injury to lipids, proteins, and DNA, leading to the generation of lipid peroxidation, damage of nuclear and mitochondrial DNA, neuronal apoptosis, and neuroinflammatory response. Transcription factor NF-E2 related factor 2 (Nrf2), a basic leucine zipper protein, plays an important role in the regulation of antioxidant proteins, such as oxygenase-1(HO-1), NAD(P)H Quinone Dehydrogenase 1 (NQO1), and glutathione peroxidase (GPx), to protect against oxidative stress, neuroinflammation, and neuronal apoptosis. Recently, emerging evidence indicated the knockout (KO) of Nrf2 aggravates the pathology of TBI, while the treatment of Nrf2 activators inhibits neuronal apoptosis and neuroinflammatory responses via reducing oxidative damage. Phytochemicals from fruits, vegetables, grains, and other medical herbs have been demonstrated to activate the Nrf2 signaling pathway and exert neuroprotective effects in TBI. In this review, we emphasized the contributive role of oxidative stress in the pathology of TBI and the protective mechanism of the Nrf2-mediated oxidative stress response for the treatment of TBI. In addition, we summarized the research advances of phytochemicals, including polyphenols, terpenoids, natural pigments, and otherwise, in the activation of Nrf2 signaling and their potential therapies for TBI. Although there is still limited clinical application evidence for these natural Nrf2 activators, we believe that the combinational use of phytochemicals such as Nrf2 activators with gene and stem cell therapy will be a promising therapeutic strategy for TBI in the future.
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Kim DH, Nguyen TN, Han YM, Tran P, Rho J, Lee JY, Son HY, Park JS. Local drug delivery using poly(lactic-co-glycolic acid) nanoparticles in thermosensitive gels for inner ear disease treatment. Drug Deliv 2021; 28:2268-2277. [PMID: 34668836 PMCID: PMC8530482 DOI: 10.1080/10717544.2021.1992041] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Intratympanic (IT) therapies have been explored to address several side effects that could be caused by systemic administration of steroids to treat inner ear diseases. For effective drug delivery to the inner ear, an IT delivery system was developed using poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) and thermosensitive gels to maintain sustained release. Dexamethasone (DEX) was used as a model drug. The size and zeta potential of PLGA NPs and the gelation time of the thermosensitive gel were measured. In vitro drug release was studied using a Franz diffusion cell. Cytotoxicity of the formulations was investigated using SK-MEL-31 cells. Inflammatory responses were evaluated by histological observation of spiral ganglion cells and stria vascularis in the mouse cochlea 24 h after IT administration. In addition, the biodistribution of the formulations in mouse ears was observed by fluorescence imaging using coumarin-6. DEX-NPs showed a particle size of 150.0 ± 3.2 nm in diameter and a zeta potential of −18.7 ± 0.6. The DEX-NP-gel showed a gelation time of approximately 64 s at 37 °C and presented a similar release profile and cytotoxicity as that for DEX-NP. Furthermore, no significant inflammatory response was observed after IT administration. Fluorescence imaging results suggested that DEX-NP-gel sustained release compared to the other formulations. In conclusion, the PLGA NP-loaded thermosensitive gel may be a potential drug delivery system for the inner ear.
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Affiliation(s)
- Dong-Hyun Kim
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Thu Nhan Nguyen
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Young-Min Han
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Phuong Tran
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Jinhyung Rho
- College of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Jae-Young Lee
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Hwa-Young Son
- College of Veterinary Medicine, Chungnam National University, Daejeon, Republic of Korea
| | - Jeong-Sook Park
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
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10
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Qnouch A, Solarczyk V, Verin J, Tourrel G, Stahl P, Danede F, Willart JF, Lemesre PE, Vincent C, Siepmann J, Siepmann F. Dexamethasone-loaded cochlear implants: How to provide a desired "burst release". INTERNATIONAL JOURNAL OF PHARMACEUTICS-X 2021; 3:100088. [PMID: 34553137 PMCID: PMC8441626 DOI: 10.1016/j.ijpx.2021.100088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 06/03/2021] [Accepted: 06/06/2021] [Indexed: 12/20/2022]
Abstract
Cochlear implants containing iridium platinum electrodes are used to transmit electrical signals into the inner ear of patients suffering from severe or profound deafness without valuable benefit from conventional hearing aids. However, their placement is invasive and can cause trauma as well as local inflammation, harming remaining hair cells or other inner ear cells. As foreign bodies, the implants also induce fibrosis, resulting in a less efficient conduction of the electrical signals and, thus, potentially decreased system performance. To overcome these obstacles, dexamethasone has recently been embedded in this type of implants: into the silicone matrices separating the metal electrodes (to avoid short circuits). It has been shown that the resulting drug release can be controlled over several years. Importantly, the dexamethasone does not only act against the immediate consequences of trauma, inflammation and fibrosis, it can also be expected to be beneficial for remaining hair cells in the long term. However, the reported amounts of drug released at “early” time points (during the first days/weeks) are relatively low and the in vivo efficacy in animal models was reported to be non-optimal. The aim of this study was to increase the initial “burst release” from the implants, adding a freely water-soluble salt of a phosphate ester of dexamethasone. The idea was to facilitate water penetration into the highly hydrophobic system and, thus, to promote drug dissolution and diffusion. This approach was efficient: Adding up to 10% dexamethasone sodium phosphate to the silicone matrices substantially increased the resulting drug release rate at early time points. This can be expected to improve drug action and implant functionality. But at elevated dexamethasone sodium phosphate loadings device swelling became important. Since the cochlea is a tiny and sensitive organ, a potential increase in implant dimensions over time must be limited. Hence, a balance has to be found between drug release and implant swelling.
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Affiliation(s)
- A Qnouch
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - V Solarczyk
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - J Verin
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - G Tourrel
- Oticon Medical, R&D, 06224 Vallauris, France
| | - P Stahl
- Oticon Medical, R&D, 06224 Vallauris, France
| | - F Danede
- Univ. Lille, UMR CNRS 8207, UMET, F-59655 Villeneuve d'Ascq, France
| | - J F Willart
- Univ. Lille, UMR CNRS 8207, UMET, F-59655 Villeneuve d'Ascq, France
| | - P E Lemesre
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - C Vincent
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - J Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - F Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
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Abstract
: Local glucocorticosteroid ("steroid") therapy is widely used to treat the inner ears of patients with Menière's disease, idiopathic sudden sensorineural hearing loss and in combination with cochlear implants. Applied steroids have included dexamethasone, methylprednisolone, and triamcinolone. In reality, however, this is often not true and the steroid forms commonly applied are dexamethasone-phosphate, methylprednisolone-hemisuccinate, or triamcinolone-acetonide. In each case, the additional component is not a counter-ion but is covalently bound to the molecule to increase aqueous solubility or potency. These drug forms are approved for intravenous or intramuscular delivery and are used "off-label" in the ear. When given systemically, the molecular form of the drug is of minor importance as the drugs are rapidly metabolized. In contrast, when administered intratympanically, the exact form of the drug has a major influence on entry into perilymph and elimination from perilymph, which in turn influences distribution along the cochlear scalae. Dexamethasone-phosphate has completely different molecular properties to dexamethasone and has different pharmacokinetic properties entering and leaving perilymph. Molecular properties and perilymph pharmacokinetics also differ markedly for triamcinolone and triamcinolone-acetonide. Methylprednisolone-hemisuccinate has completely different molecular properties to methylprednisolone. In the ear, different steroid forms cannot therefore be regarded as equivalent in terms of pharmacokinetics or efficacy. This presents a terminology problem, where in many cases the drug stated in publications may not be the form actually administered. The lack of precision in nomenclature is a serious problem for the inner ear drug delivery field and needs to be recognized.
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Yang IH, Lin IE, Chen TC, Chen ZY, Kuan CY, Lin JN, Chou YC, Lin FH. Synthesis, characterization, and evaluation of BDDE crosslinked chitosan-TGA hydrogel encapsulated with genistein for vaginal atrophy. Carbohydr Polym 2021; 260:117832. [PMID: 33712170 DOI: 10.1016/j.carbpol.2021.117832] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 02/09/2021] [Accepted: 02/14/2021] [Indexed: 12/20/2022]
Abstract
Vagina atrophy is a common symptom in women after menopause owing to decreasing estrogen levels. The most conventional treatment for this condition is estrogen cream. The shortcoming is its weak adhesion to the vagina mucus, thus requiring frequent daily application. In this study, BDDE was selected to crosslink and graft chitosan with thioglycolic acid, to form thiolated chitosan (CT) and improve the mucoadhesive properties of chitosan. Genistein was selected as the bioactive molecule that could exhibit estrogen-like properties for long-term treatment of vaginal atrophy. The efficacies of the materials were characterized and evaluated both in vitro and in vivo. Results showed that the mucoadhesive property of CT was approximately two-fold stronger against the constant flow than unmodified chitosan. CT with genistein (CT-G) was administered intravaginally every three days in vivo. It showed that the developed CT-G recover 54 % of the epithelium thickness of an atrophic vagina and ease vaginal atrophy.
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Affiliation(s)
- I-Hsuan Yang
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan
| | - I-En Lin
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan
| | - Tzu-Chien Chen
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan
| | - Zhi-Yu Chen
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan
| | - Che-Yung Kuan
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan; Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, No. 35, Keyan Road, Zhunan, Miaoli County, 35053, Taiwan
| | - Jhih-Ni Lin
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan
| | - Yu-Chia Chou
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan
| | - Feng-Huei Lin
- Department of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, No. 49, Fanglan Rd, Taipei, 10672, Taiwan; Institute of Biomedical Engineering and Nanomedicine, National Health Research Institutes, No. 35, Keyan Road, Zhunan, Miaoli County, 35053, Taiwan.
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Sumner L, Mestel J, Reichenbach T. Steady streaming as a method for drug delivery to the inner ear. Sci Rep 2021; 11:57. [PMID: 33420230 PMCID: PMC7794396 DOI: 10.1038/s41598-020-79946-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 12/15/2020] [Indexed: 11/15/2022] Open
Abstract
The inner ear, or cochlea, is a fluid-filled organ housing the mechanosensitive hair cells. Sound stimulation is relayed to the hair cells through waves that propagate on the elastic basilar membrane. Sensorineural hearing loss occurs from damage to the hair cells and cannot currently be cured. Although drugs have been proposed to prevent damage or restore functionality to hair cells, a difficulty with such treatments is ensuring adequate drug delivery to the cells. Because the cochlea is encased in the temporal bone, it can only be accessed from its basal end. However, the hair cells that are responsible for detecting speech-frequency sounds reside at the opposite, apical end. In this paper we show that steady streaming can be used to transport drugs along the cochlea. Steady streaming is a nonlinear process that accompanies many fluctuating fluid motions, including the sound-evoked waves in the inner ear. We combine an analytical approximation for the waves in the cochlea with computational fluid dynamic simulations to demonstrate that the combined steady streaming effects of several different frequencies can transport drugs from the base of the cochlea further towards the apex. Our results therefore show that multi-frequency sound stimulation can serve as a non-invasive method to transport drugs efficiently along the cochlea.
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Affiliation(s)
- Laura Sumner
- Department of Bioengineering and Centre for Neurotechnology, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Jonathan Mestel
- Department of Mathematics, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Tobias Reichenbach
- Department of Bioengineering and Centre for Neurotechnology, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK.
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Gausterer JC, Saidov N, Ahmadi N, Zhu C, Wirth M, Reznicek G, Arnoldner C, Gabor F, Honeder C. Intratympanic application of poloxamer 407 hydrogels results in sustained N-acetylcysteine delivery to the inner ear. Eur J Pharm Biopharm 2020; 150:143-155. [DOI: 10.1016/j.ejpb.2020.03.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 01/20/2020] [Accepted: 03/04/2020] [Indexed: 01/06/2023]
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Rathnam C, Chueng STD, Ying YLM, Lee KB, Kwan K. Developments in Bio-Inspired Nanomaterials for Therapeutic Delivery to Treat Hearing Loss. Front Cell Neurosci 2019; 13:493. [PMID: 31780898 PMCID: PMC6851168 DOI: 10.3389/fncel.2019.00493] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 10/21/2019] [Indexed: 01/10/2023] Open
Abstract
Sensorineural hearing loss affects millions of people worldwide and is a growing concern in the aging population. Treatment using aminoglycoside antibiotics for infection and exposure to loud sounds contribute to the degeneration of cochlear hair cells and spiral ganglion neurons. Cell loss impacts cochlear function and causes hearing loss in ∼ 15% of adult Americans (∼36 million). The number of individuals with hearing loss will likely grow with increasing lifespans. Current prosthesis such as hearing aids and cochlear implants can ameliorate hearing loss. However, hearing aids are ineffective if hair cells or spiral ganglion neurons are severely damaged, and cochlear implants are ineffective without properly functioning spiral ganglion neurons. As such, strategies that alleviate hearing loss by preventing degeneration or promoting cell replacement are urgently needed. Despite showing great promise from in vitro studies, the complexity and delicate nature of the inner ear poses a huge challenge for delivering therapeutics. To mitigate risks and complications associated with surgery, new technologies and methodologies have emerged for efficient delivery of therapeutics. We will focus on biomaterials that allow controlled and local drug delivery into the inner ear. The rapid development of microsurgical techniques in conjunction with novel bio- and nanomaterials for sustained drug delivery appears bright for hearing loss treatment.
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Affiliation(s)
- Christopher Rathnam
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, United States
| | - Sy-Tsong Dean Chueng
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, United States
| | - Yu-Lan Mary Ying
- Department of Otolaryngology Head and Neck Surgery, Rutgers New Jersey Medical School, Newark, NJ, United States
| | - Ki-Bum Lee
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ, United States.,Stem Cell Research Center and Keck Center for Collaborative Neuroscience, Rutgers, The State University of New Jersey, Piscataway, NJ, United States
| | - Kelvin Kwan
- Stem Cell Research Center and Keck Center for Collaborative Neuroscience, Rutgers, The State University of New Jersey, Piscataway, NJ, United States.,Department of Cell Biology and Neuroscience, Rutgers, The State University of New Jersey, Piscataway, NJ, United States
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16
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Honeder C, Zhu C, Gausterer JC, Schöpper H, Ahmadi N, Saidov N, Nieratschker M, Gabor F, Arnoldner C. Sustained-Release Triamcinolone Acetonide Hydrogels Reduce Hearing Threshold Shifts in a Model for Cochlear Implantation with Hearing Preservation. Audiol Neurootol 2019; 24:237-244. [PMID: 31574511 DOI: 10.1159/000501331] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 06/04/2019] [Indexed: 11/19/2022] Open
Abstract
INTRODUCTION In recent years, the preservation of residual hearing has become a major factor in patients undergoing cochlear implantation (CI). In studies attempting to pharmaceutically improve hearing preservation rates, glucocorticoids (GCs) applied perioperatively in many institutions have emerged as a promising treatment regimen. Although dexamethasone is most commonly used and has been applied successfully by various research groups, recently pharmacological properties have been reported to be relatively unsuitable for topical delivery to the inner ear. Consequently other glucocorticoids merit further evaluation. The aim of this study was therefore to evaluate the otoprotective effects of the topical application of a sustained-release triamcinolone acetonide (TAAC) hydrogel in CI with hearing preservation. METHODS Normal-hearing pigmented guinea pigs were randomized into a group receiving a single dose of a 6% TAAC poloxamer 407 hydrogel, a group receiving a 30% TAAC hydrogel and a control group. All hydrogel applications were performed 1 day prior to CI. After a cochleostomy was drilled, a specifically designed silicone electrode was inserted into the scala tympani for 5 mm. Frequency-specific compound action potentials of the auditory nerve (0.5-32 kHz) were measured pre- and directly postoperatively as well as on days 3, 7, 14, 21, and 28. Finally, temporal bones were harvested for histological evaluation. RESULTS Application of the TAAC hydrogels resulted in significantly reduced hearing threshold shifts in low, middle and high frequencies and improved spiral ganglion cell survival in the second turn of the cochlea. Outer hair cell numbers in the basal and second turn of the cochlea were slightly reduced after TAAC application. CONCLUSION In summary, we were able to demonstrate functional benefits of a single preoperative application of a TAAC hydrogel in a guinea pig model for CI, which persisted until the end of the observational period, that is, 28 days after surgery.
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Affiliation(s)
- Clemens Honeder
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Chengjing Zhu
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Julia Clara Gausterer
- Department of Pharmaceutical Technology and Biopharmaceutics, University of Vienna, Vienna, Austria
| | - Hanna Schöpper
- Department of Pathobiology, Institute of Anatomy, Histology and Embryology, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Navid Ahmadi
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Nodir Saidov
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Michael Nieratschker
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Franz Gabor
- Department of Pharmaceutical Technology and Biopharmaceutics, University of Vienna, Vienna, Austria,
| | - Christoph Arnoldner
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
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17
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Santimetaneedol A, Wang Z, Arteaga DN, Aksit A, Prevoteau C, Yu M, Chiang H, Fafalis D, Lalwani AK, Kysar JW. Small molecule delivery across a perforated artificial membrane by thermoreversible hydrogel poloxamer 407. Colloids Surf B Biointerfaces 2019; 182:110300. [PMID: 31326623 DOI: 10.1016/j.colsurfb.2019.06.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 06/14/2019] [Accepted: 06/14/2019] [Indexed: 12/11/2022]
Abstract
Microperforations in the round window membrane have been suggested for enhancing the rate and reliability of drug delivery into the cochlea. Intratympanic injection, the most common delivery method, involves injecting therapy into the middle ear to establish a reservoir from which drug diffuses across the round window membrane into the cochlea. This process is highly variable because (i) the reservoir, if liquid, can lose contact with the membrane and (ii) diffusion across the membrane is intrinsically variable even with a stable reservoir. To address these respective sources of variability, we compared the thermoreversible hydrogel poloxamer 407 (P407) to saline as a drug carrier and studied the effect of membrane microperforations on drug diffusion rate. We used Rhodamine B as a drug proxy to measure permeance across an artificial membrane in a horizontal diffusion cell. We found that permeance of Rhodamine B from a saline reservoir was an order of magnitude higher than that from a P407 reservoir across unperforated membranes. Moreover, permeance increased with total perforation cross-sectional area regardless of number of perforations (p < 0.05 for all saline-based experiments), but the same association was not found with P407. Rather, for a P407 reservoir, only a large perforation increased permeance (p < 0.001), while multiple small perforations did not (p = 0.749). These results confirm that for drug dissolved in saline, multiple small perforations can effectively enhance diffusion. However, for drug dissolved in P407, larger perforations are necessary.
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Affiliation(s)
- A Santimetaneedol
- Department of Mechanical Engineering, Columbia University, New York, NY, United States
| | - Z Wang
- Department of Mechanical Engineering, Columbia University, New York, NY, United States
| | - D N Arteaga
- Department of Otolaryngology - Head & Neck Surgery, Columbia University Medical Center, New York, NY, United States
| | - A Aksit
- Department of Mechanical Engineering, Columbia University, New York, NY, United States
| | - C Prevoteau
- Department of Otolaryngology - Head & Neck Surgery, Columbia University Medical Center, New York, NY, United States
| | - M Yu
- Department of Otolaryngology - Head & Neck Surgery, Columbia University Medical Center, New York, NY, United States
| | - H Chiang
- Department of Otolaryngology - Head & Neck Surgery, Columbia University Medical Center, New York, NY, United States
| | - D Fafalis
- Department of Mechanical Engineering, Columbia University, New York, NY, United States
| | - A K Lalwani
- Department of Mechanical Engineering, Columbia University, New York, NY, United States; Department of Otolaryngology - Head & Neck Surgery, Columbia University Medical Center, New York, NY, United States.
| | - J W Kysar
- Department of Mechanical Engineering, Columbia University, New York, NY, United States; Department of Otolaryngology - Head & Neck Surgery, Columbia University Medical Center, New York, NY, United States
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18
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Nemutlu E, Eroğlu İ, Eroğlu H, Kır S. In Vitro Release Test of Nano-drug Delivery Systems Based on Analytical and Technological Perspectives. CURR ANAL CHEM 2019. [DOI: 10.2174/1573411014666180912125931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Background:Nanotech products are gaining more attention depending on their advantages for improving drug solubility, maintenance of drug targeting, and attenuation of drug toxicity. In vitro release test is the critical physical parameter to determine the pharmaceutical quality of the product, to monitor formulation design and batch-to-batch variation.Methods:Spectrophotometric and chromatographic methods are mostly used in quantification studies from in vitro release test of nano-drug delivery systems. These techniques have advantages and disadvantages with respect to each other considering dynamic range, selectivity, automation, compatibility with in vitro release media and cost per sample.Results:It is very important to determine the correct kinetic profile of active pharmaceutical substances. At this point, the analytical method used for in vitro release tests has become a very critical parameter to correctly assess the profiles. In this review, we provided an overview of analytical methods applied to the in vitro release assay of various nanopharmaceuticals.Conclusion:This review presents practical direction on analytical method selection for in vitro release test on nanopharmaceuticals. Moreover, precautions on analytical method selection, optimization and validation were discussed.
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Affiliation(s)
- Emirhan Nemutlu
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
| | - İpek Eroğlu
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
| | - Hakan Eroğlu
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
| | - Sedef Kır
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100, Sıhhiye, Ankara, Turkey
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19
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Thermosensitive hydrogel-based drug delivery system for sustained drug release. JOURNAL OF POLYMER RESEARCH 2019. [DOI: 10.1007/s10965-019-1771-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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20
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Musazzi UM, Franzé S, Cilurzo F. Innovative pharmaceutical approaches for the management of inner ear disorders. Drug Deliv Transl Res 2018; 8:436-449. [PMID: 28462501 DOI: 10.1007/s13346-017-0384-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The sense of hearing is essential for permitting human beings to interact with the environment, and its dysfunctions can strongly impact on the quality of life. In this context, the cochlea plays a fundamental role in the transformation of the airborne sound waves into electrical signals, which can be processed by the brain. However, several diseases and external stimuli (e.g., noise, drugs) can damage the sensorineural structures of cochlea, inducing progressive hearing dysfunctions until deafness. In clinical practice, the current pharmacological approaches to treat cochlear diseases are based on the almost exclusive use of systemic steroids. In the last decades, the efficacy of novel therapeutic molecules has been proven, taking advantage from a better comprehension of the pathological mechanisms underlying many cochlear diseases. In addition, the feasibility of intratympanic administration of drugs also permitted to overcome the pharmacokinetic limitations of the systemic drug administration, opening new frontiers in drug delivery to cochlea. Several innovative drug delivery systems, such as in situ gelling systems or nanocarriers, were designed, and their efficacy has been proven in vitro and in vivo in cochlear models. The current review aims to describe the art of state in the cochlear drug delivery, highlighting lights and shadows and discussing the most critical aspects still pending in the field.
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Affiliation(s)
- Umberto M Musazzi
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, Via G. Colombo, 71, 20133, Milan, Italy.
| | - Silvia Franzé
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, Via G. Colombo, 71, 20133, Milan, Italy
| | - Francesco Cilurzo
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, Via G. Colombo, 71, 20133, Milan, Italy
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21
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Liu X, Li M, Smyth H, Zhang F. Otic drug delivery systems: formulation principles and recent developments. Drug Dev Ind Pharm 2018; 44:1395-1408. [PMID: 29659300 DOI: 10.1080/03639045.2018.1464022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Disorders of the ear severely impact the quality of life of millions of people, but the treatment of these disorders is an ongoing, but often overlooked challenge particularly in terms of formulation design and product development. The prevalence of ear disorders has spurred significant efforts to develop new therapeutic agents, but perhaps less innovation has been applied to new drug delivery systems to improve the efficacy of ear disease treatments. This review provides a brief overview of physiology, major diseases, and current therapies used via the otic route of administration. The primary focuses are on the various administration routes and their formulation principles. The article also presents recent advances in otic drug deliveries as well as potential limitations. Otic drug delivery technology will likely evolve in the next decade and more efficient or specific treatments for ear disease will arise from the development of less invasive drug delivery methods, safe and highly controlled drug delivery systems, and biotechnology targeting therapies.
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Affiliation(s)
- Xu Liu
- a College of Pharmacy , The University of Texas at Austin , Austin , TX , USA
| | - Mingshuang Li
- b Department of Communication Sciences and Disorders , The University of Texas at Austin , Austin , TX , USA
| | - Hugh Smyth
- a College of Pharmacy , The University of Texas at Austin , Austin , TX , USA
| | - Feng Zhang
- a College of Pharmacy , The University of Texas at Austin , Austin , TX , USA
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22
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Kamalov MI, Đặng T, Petrova NV, Laikov AV, Luong D, Akhmadishina RA, Lukashkin AN, Abdullin TI. Self-assembled nanoformulation of methylprednisolone succinate with carboxylated block copolymer for local glucocorticoid therapy. Colloids Surf B Biointerfaces 2018; 164:78-88. [DOI: 10.1016/j.colsurfb.2018.01.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 01/09/2018] [Accepted: 01/10/2018] [Indexed: 02/07/2023]
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23
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Mäder K, Lehner E, Liebau A, Plontke SK. Controlled drug release to the inner ear: Concepts, materials, mechanisms, and performance. Hear Res 2018; 368:49-66. [PMID: 29576310 DOI: 10.1016/j.heares.2018.03.006] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 02/21/2018] [Accepted: 03/06/2018] [Indexed: 12/01/2022]
Abstract
Progress in drug delivery to the ear has been achieved over the last few years. This review illustrates the main mechanisms of controlled drug release and the resulting geometry- and size-dependent release kinetics. The potency, physicochemical properties, and stability of the drug molecules are key parameters for designing the most suitable drug delivery system. The most important drug delivery systems for the inner ear include solid foams, hydrogels, and different nanoscale drug delivery systems (e.g., nanoparticles, liposomes, lipid nanocapsules, polymersomes). Their main characteristics (i.e., general structure and materials) are discussed, with special attention given to underlining the link between the physicochemical properties (e.g., surface areas, glass transition temperature, microviscosity, size, and shape) and release kinetics. An appropriate characterization of the drug, the excipients used, and the formulated drug delivery systems is necessary to achieve a deeper understanding of the release process and decrease variability originating from the drug delivery system. This task cannot be solved by otologists alone. The interdisciplinary cooperation between otology/neurotology, pharmaceutics, physics, and other disciplines will result in improved drug delivery systems for the inner ear.
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Affiliation(s)
- Karsten Mäder
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, D-06120 Halle (Saale), Germany.
| | - Eric Lehner
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Wolfgang-Langenbeck-Str. 4, D-06120 Halle (Saale), Germany
| | - Arne Liebau
- Department of Otorhinolaryngology, Head & Neck Surgery, Martin Luther University Halle-Wittenberg, University Medicine Halle, Ernst-Grube-Str. 40, 06120 Halle (Saale), Germany
| | - Stefan K Plontke
- Department of Otorhinolaryngology, Head & Neck Surgery, Martin Luther University Halle-Wittenberg, University Medicine Halle, Ernst-Grube-Str. 40, 06120 Halle (Saale), Germany
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24
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Revisiting in vitro release test for topical gel formulations: The effect of osmotic pressure explored for better bio-relevance. Eur J Pharm Sci 2018; 112:102-111. [DOI: 10.1016/j.ejps.2017.11.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 11/08/2017] [Accepted: 11/09/2017] [Indexed: 11/19/2022]
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25
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Dai J, Long W, Liang Z, Wen L, Yang F, Chen G. A novel vehicle for local protein delivery to the inner ear: injectable and biodegradable thermosensitive hydrogel loaded with PLGA nanoparticles. Drug Dev Ind Pharm 2017; 44:89-98. [PMID: 28851247 DOI: 10.1080/03639045.2017.1373803] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Delivery of biomacromolecular drugs into the inner ear is challenging, mainly because of their inherent instability as well as physiological and anatomical barriers. Therefore, protein-friendly, hydrogel-based delivery systems following local administration are being developed for inner ear therapy. Herein, biodegradable poly(lactic-co-glycolic acid) (PLGA) nanoparticles (NPs) containing interferon α-2 b (IFN α-2 b) were loaded in chitosan/glycerophosphate (CS/GP)-based thermosensitive hydrogel for IFN delivery by intratympanic injection. The injectable hydrogel possessed a physiological pH and formed semi-solid gel at 37 °C, with good swelling and deswelling properties. The CS/GP hydrogel could slowly degrade as visualized by scanning electron microscopy (SEM). The presence of NPs in CS/GP gel largely influenced in vitro drug release. In the guinea pig cochlea, a 1.5- to 3-fold increase in the drug exposure time of NPs-CS/GP was found than those of the solution, NPs and IFN-loaded hydrogel. Most importantly, a prolonged residence time was attained without obvious histological changes in the inner ear. This biodegradable, injectable, and thermosensitive NPs-CS/GP system may allow longer delivery of protein drugs to the inner ear, thus may be a potential novel vehicle for inner ear therapy.
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Affiliation(s)
- Juan Dai
- a School of Pharmacy , Guangdong Pharmaceutical University , Guangzhou , China.,b Guangdong Provincial Key Laboratory of Advanced Drug Delivery , Guangdong Pharmaceutical University , Guangzhou , China
| | - Wei Long
- a School of Pharmacy , Guangdong Pharmaceutical University , Guangzhou , China.,b Guangdong Provincial Key Laboratory of Advanced Drug Delivery , Guangdong Pharmaceutical University , Guangzhou , China
| | - Zhongping Liang
- a School of Pharmacy , Guangdong Pharmaceutical University , Guangzhou , China.,b Guangdong Provincial Key Laboratory of Advanced Drug Delivery , Guangdong Pharmaceutical University , Guangzhou , China
| | - Lu Wen
- a School of Pharmacy , Guangdong Pharmaceutical University , Guangzhou , China
| | - Fan Yang
- a School of Pharmacy , Guangdong Pharmaceutical University , Guangzhou , China.,b Guangdong Provincial Key Laboratory of Advanced Drug Delivery , Guangdong Pharmaceutical University , Guangzhou , China
| | - Gang Chen
- a School of Pharmacy , Guangdong Pharmaceutical University , Guangzhou , China.,b Guangdong Provincial Key Laboratory of Advanced Drug Delivery , Guangdong Pharmaceutical University , Guangzhou , China
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26
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Intratympanic Triamcinolone and Dexamethasone in the Treatment of Ménière's Syndrome. Otol Neurotol 2017; 38:386-391. [DOI: 10.1097/mao.0000000000001311] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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27
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Yoon JY, Yang KJ, Park SN, Kim DK, Kim JD. The effect of dexamethasone/cell-penetrating peptide nanoparticles on gene delivery for inner ear therapy. Int J Nanomedicine 2016; 11:6123-6134. [PMID: 27895484 PMCID: PMC5117898 DOI: 10.2147/ijn.s114241] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Dexamethasone (Dex)-loaded PHEA-g-C18-Arg8 (PCA) nanoparticles (PCA/Dex) were developed for the delivery of genes to determine the synergistic effect of Dex on gene expression. The cationic PCA nanoparticles were self-assembled to create cationic micelles containing an octadecylamine (C18) core with Dex and an arginine 8 (Arg8) peptide shell for electrostatic complexation with nucleic acids (connexin 26 [Cx26] siRNA, green fluorescent protein [GFP] DNA or brain-derived neurotrophic factor [BDNF] pDNA). The PCA/Dex nanoparticles conjugated with Arg8, a cell-penetrating peptide that enhances permeability through a round window membrane in the inner ear for gene delivery, exhibited high uptake efficiency in HEI-OC1 cells. This potential carrier co-delivering Dex and the gene into inner ear cells has a diameter of 120-140 nm and a zeta potential of 20-25 mV. Different types of genes were complexed with the Dex-loaded PCA nanoparticle (PCA/Dex/gene) for gene expression to induce additional anti-inflammatory effects. PCA/Dex showed mildly increased expression of GFP and lower mRNA expression of inflammatory cytokines (IL1b, IL12, and INFr) than did Dex-free PCA nanoparticles and Lipofectamine® reagent in HEI-OC1 cells. In addition, after loading Cx26 siRNA onto the surface of PCA/Dex, Cx26 gene expression was downregulated according to real-time polymerase chain reaction for 24 h, compared with that using Lipofectamine reagent. After loading BDNF DNA into PCA/Dex, increased expression of BDNF was observed for 30 h, and its signaling pathway resulted in an increase in phosphorylation of Akt, observed by Western blotting. Thus, Dex within PCA/Dex/gene nanoparticles created an anti-inflammatory effect and enhanced gene expression.
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Affiliation(s)
- Ji Young Yoon
- Department of Chemical and Biomolecular Engineering, BK 21 Plus Program, Korea Advanced Institute of Science and Technology, Guseong-Dong, Yuseong-Gu, Daejeon
| | - Keum-Jin Yang
- Clinical Research Institute, St Mary's Hospital, Daejeon
| | - Shi-Nae Park
- Department of Otolaryngology - Head and Neck Surgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Dong-Kee Kim
- Department of Otolaryngology - Head and Neck Surgery, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jong-Duk Kim
- Department of Chemical and Biomolecular Engineering, BK 21 Plus Program, Korea Advanced Institute of Science and Technology, Guseong-Dong, Yuseong-Gu, Daejeon
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28
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Ban E, Jang DJ, Kim SJ, Park M, Kim A. Optimization of thermoreversible poloxamer gel system using QbD principle. Pharm Dev Technol 2016; 22:939-945. [DOI: 10.1080/10837450.2016.1219371] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Eunmi Ban
- College of Pharmacy, CHA University, Seongnam, Korea
| | - Dong-Jin Jang
- Department of Pharmaceutical Engineering, Inje University, Gimhae, Korea
| | - Su-Jin Kim
- College of Pharmacy, CHA University, Seongnam, Korea
| | - Mijung Park
- College of Pharmacy, CHA University, Seongnam, Korea
| | - Aeri Kim
- College of Pharmacy, CHA University, Seongnam, Korea
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29
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Honeder C, Zhu C, Schöpper H, Gausterer JC, Walter M, Landegger LD, Saidov N, Riss D, Plasenzotti R, Gabor F, Arnoldner C. Effects of sustained release dexamethasone hydrogels in hearing preservation cochlear implantation. Hear Res 2016; 341:43-49. [PMID: 27519654 DOI: 10.1016/j.heares.2016.08.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 06/28/2016] [Accepted: 08/08/2016] [Indexed: 01/12/2023]
Abstract
It has been shown that glucocorticoids reduce the hearing threshold shifts associated with cochlear implantation. Previous studies evaluated the administration of glucocorticoids immediately before surgery or the repeated pre- or perioperative systemic application of glucocorticoids. The aim of this study was to evaluate the effects of a sustained release dexamethasone hydrogel in hearing preservation cochlear implantation. To address this issue, a guinea pig model of cochlear implantation was used. 30 normal hearing pigmented guinea pigs were randomized into a group receiving a single dose of a dexamethasone/poloxamer407 hydrogel one day prior to surgery, a second group receiving the hydrogel seven days prior to surgery and a control group. A silicone cochlear implant electrode designed for the use in guinea pigs was inserted to a depth of 5 mm through a cochleostomy. Compound action potentials of the auditory nerve (frequency range 0.5-32 kHz) were measured preoperatively, directly postoperatively and on postoperative days 3, 7, 14, 21 and 28. Following the last audiometry, temporal bones were harvested and histologically evaluated. Dexamethasone hydrogel application one day prior to surgery resulted in significantly reduced hearing threshold shifts at low, middle and high frequencies measured at postoperative day 28 (p < 0.05). Application of the hydrogel seven days prior to surgery did not show such an effect. Dexamethasone application one day prior to surgery resulted in increased outer hair cell counts in the cochlear apex and in reduced spiral ganglion cell counts in the basal and middle turn of the cochlea, a finding that was associated with a higher rate of electrode translocation in this group. In this study, we were able to demonstrate functional benefits of a single preoperative intratympanic application of a sustained release dexamethasone hydrogel in a guinea pig model of cochlear implantation.
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Affiliation(s)
- Clemens Honeder
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Chengjing Zhu
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Hanna Schöpper
- Department of Pathobiology, Institute of Anatomy, Histology and Embryology, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Julia Clara Gausterer
- Department of Pharmaceutical Technology and Biopharmaceutics, University of Vienna, Vienna, Austria
| | - Manuel Walter
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | | | - Nodir Saidov
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Dominik Riss
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria
| | - Roberto Plasenzotti
- Department of Biomedical Research, Medical University of Vienna, Vienna, Austria
| | - Franz Gabor
- Department of Pharmaceutical Technology and Biopharmaceutics, University of Vienna, Vienna, Austria
| | - Christoph Arnoldner
- Department of Otorhinolaryngology, Medical University of Vienna, Vienna, Austria.
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30
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Gehrke M, Sircoglou J, Gnansia D, Tourrel G, Willart JF, Danede F, Lacante E, Vincent C, Siepmann F, Siepmann J. Ear Cubes for local controlled drug delivery to the inner ear. Int J Pharm 2016; 509:85-94. [DOI: 10.1016/j.ijpharm.2016.04.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 03/31/2016] [Accepted: 04/01/2016] [Indexed: 02/06/2023]
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31
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Yu D, Sun C, Zheng Z, Wang X, Chen D, Wu H, Wang X, Shi F. Inner ear delivery of dexamethasone using injectable silk-polyethylene glycol (PEG) hydrogel. Int J Pharm 2016; 503:229-37. [PMID: 26972377 DOI: 10.1016/j.ijpharm.2016.02.048] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 02/15/2016] [Accepted: 02/29/2016] [Indexed: 11/17/2022]
Abstract
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. The loading of mDEX in Silk-PEG hydrogel largely influenced in vitro drug release kinetics. The optimized Silk-PEG-mDEX hydrogel (2.5% w/v loading, in situ-forming, 10 μl) was administered directly onto the round window membrane of guinea pigs. The DEX concentration in perilymph maintained above 100 ng/ml for at least 10 days for the Silk-PEG formulation while less than 12h for the control sample of free mDEX. Minimal systemic exposure was achieved with low DEX concentrations (<0.2 μg/ml) in cerebrospinal fluid (CSF) and plasma in the first 2h after the local application of the Silk-PEG-mDEX hydrogel. A transient hearing threshold shift was found but then resolved after 14 days as revealed by auditory brainstem response (ABR), showing minimal inflammatory responses on the round window membrane and scala taympani. The Silk-PEG hydrogel completely degraded in 21 days. Thus, the injectable PEG-Silk hydrogel is an effective and safe vehicle for inner ear delivery and sustained release of glucocorticoid.
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Affiliation(s)
- Dehong Yu
- Department of Otolaryngology-Head and Neck Surgery, Xinhua Hospital, Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai 200092, China
| | - Changling Sun
- Department of Otolaryngology-Head and Neck Surgery, Xinhua Hospital, Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai 200092, China; Department of Otolaryngology-Head and Neck Surgery, Affiliated Hospital of Jiangnan University, The Fourth People's Hospital of Wuxi City, Wuxi 214062, China
| | - Zhaozhu Zheng
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China
| | - Xueling Wang
- Department of Otolaryngology-Head and Neck Surgery, Xinhua Hospital, Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai 200092, China
| | - Dongye Chen
- Department of Otolaryngology-Head and Neck Surgery, Xinhua Hospital, Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai 200092, China
| | - Hao Wu
- Department of Otolaryngology-Head and Neck Surgery, Xinhua Hospital, Ear Institute, Shanghai Jiaotong University School of Medicine, Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai 200092, China.
| | - Xiaoqin Wang
- National Engineering Laboratory for Modern Silk, Soochow University, Suzhou 215123, China.
| | - Fuxin Shi
- Department of Otology and Laryngology, Eaton-Peabody Laboratory, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA 02115, USA
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Yoon JY, Yang KJ, Kim DE, Lee KY, Park SN, Kim DK, Kim JD. Intratympanic delivery of oligoarginine-conjugated nanoparticles as a gene (or drug) carrier to the inner ear. Biomaterials 2015; 73:243-53. [DOI: 10.1016/j.biomaterials.2015.09.025] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 09/15/2015] [Indexed: 01/12/2023]
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Recent advances in local drug delivery to the inner ear. Int J Pharm 2015; 494:83-101. [PMID: 26260230 DOI: 10.1016/j.ijpharm.2015.08.015] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 07/31/2015] [Accepted: 08/05/2015] [Indexed: 12/14/2022]
Abstract
Inner ear diseases are not adequately treated by systemic drug administration mainly because of the blood-perilymph barrier that reduces exchanges between plasma and inner ear fluids. Local drug delivery methods including intratympanic and intracochlear administrations are currently developed to treat inner ear disorders more efficiently. Intratympanic administration is minimally invasive but relies on diffusion through middle ear barriers for drug entry into the cochlea, whereas intracochlear administration offers direct access to the colchlea but is rather invasive. A wide range of drug delivery systems or devices were evaluated in research and clinic over the last decade for inner ear applications. In this review, different strategies including medical devices, hydrogels and nanoparticulate systems for intratympanic administration, and cochlear implant coating or advanced medical devices for intracoclear administration were explored with special attention to in vivo studies. This review highlights the promising systems for future clinical applications as well as the current hurdles that remain to be overcome for efficient inner ear therapy.
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Honeder C, Landegger LD, Engleder E, Gabor F, Plasenzotti R, Plenk H, Kaider A, Hirtler L, Gstoettner W, Arnoldner C. Effects of intraoperatively applied glucocorticoid hydrogels on residual hearing and foreign body reaction in a guinea pig model of cochlear implantation. Acta Otolaryngol 2015; 135:313-9. [PMID: 25720453 DOI: 10.3109/00016489.2014.986758] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
CONCLUSION The intraoperative application of glucocorticoid-loaded hydrogels seems to cause a reduction in neutrophil infiltration. No beneficial effect on hearing thresholds was detected. OBJECTIVES To evaluate the application of dexamethasone- and triamcinolone acetonide-loaded hydrogels for effects on hearing preservation and foreign body reaction in a guinea pig model for cochlear implantation (CI). METHODS A total of 48 guinea pigs (n = 12 per group) were implanted with a single channel electrode and intraoperatively treated with 50 μl of a 20% w/v poloxamer 407 hydrogel loaded with 6% dexamethasone or 30% triamcinolone acetonide, a control hydrogel, or physiological saline. Click- and tone burst-evoked compound action potential thresholds were determined preoperatively and directly postoperatively as well as on days 3, 7, 14, 21, and 28. At the end of the experiment, temporal bones were prepared for histological evaluation by a grinding/polishing technique with the electrode in situ. Three ears per treatment group were serially sectioned and evaluated for histological alterations. RESULTS The intratympanic application of glucocorticoid-loaded hydrogels did not improve the preservation of residual hearing in this cochlear implant model. The foreign body reaction to the electrode appeared reduced in the glucocorticoid-treated animals. No correlation was found between the histologically described trauma to the inner ear and the resulting hearing threshold shifts.
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Affiliation(s)
- Clemens Honeder
- Department of Otorhinolaryngology, Medical University of Vienna
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Ayoob AM, Borenstein JT. The role of intracochlear drug delivery devices in the management of inner ear disease. Expert Opin Drug Deliv 2014; 12:465-79. [PMID: 25347140 DOI: 10.1517/17425247.2015.974548] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
INTRODUCTION Diseases of the inner ear include those of the auditory and vestibular systems, and frequently result in disabling hearing loss or vertigo. Despite a rapidly expanding pipeline of potential cochlear therapeutics, the inner ear remains a challenging organ for targeted drug delivery, and new technologies are required to deliver these therapies in a safe and efficacious manner. In addition to traditional approaches for direct inner ear drug delivery, novel microfluidics-based systems are under development, promising improved control over pharmacokinetics over longer periods of delivery, ultimately with application towards hair cell regeneration in humans. AREAS COVERED Advances in the development of intracochlear drug delivery systems are reviewed, including passive systems, active microfluidic technologies and cochlear prosthesis-mediated delivery. This article provides a description of novel delivery systems and their potential future clinical applications in treating inner ear disease. EXPERT OPINION Recent progresses in microfluidics and miniaturization technologies are enabling the development of wearable and ultimately implantable drug delivery microsystems. Progress in this field is being spurred by the convergence of advances in molecular biology, microfluidic flow control systems and models for drug transport in the inner ear. These advances will herald a new generation of devices, with near-term applications in preclinical models, and ultimately with human clinical use for a range of diseases of the inner ear.
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