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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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Keppeler D, Schwaerzle M, Harczos T, Jablonski L, Dieter A, Wolf B, Ayub S, Vogl C, Wrobel C, Hoch G, Abdellatif K, Jeschke M, Rankovic V, Paul O, Ruther P, Moser T. Multichannel optogenetic stimulation of the auditory pathway using microfabricated LED cochlear implants in rodents. Sci Transl Med 2021; 12:12/553/eabb8086. [PMID: 32718992 DOI: 10.1126/scitranslmed.abb8086] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 06/03/2020] [Indexed: 12/28/2022]
Abstract
When hearing fails, electrical cochlear implants (eCIs) provide the brain with auditory information. One important bottleneck of CIs is the poor spectral selectivity that results from the wide current spread from each of the electrode contacts. Optical CIs (oCIs) promise to make better use of the tonotopic order of spiral ganglion neurons (SGNs) inside the cochlea by spatially confined stimulation. Here, we established multichannel oCIs based on light-emitting diode (LED) arrays and used them for optical stimulation of channelrhodopsin (ChR)-expressing SGNs in rodents. Power-efficient blue LED chips were integrated onto microfabricated 15-μm-thin polyimide-based carriers comprising interconnecting lines to address individual LEDs by a stationary or mobile driver circuitry. We extensively characterized the optoelectronic, thermal, and mechanical properties of the oCIs and demonstrated stability over weeks in vitro. We then implanted the oCIs into ChR-expressing rats and gerbils, and characterized multichannel optogenetic SGN stimulation by electrophysiological and behavioral experiments. Improved spectral selectivity was directly demonstrated by recordings from the auditory midbrain. Long-term experiments in deafened ChR-expressing rats and in nontreated control animals demonstrated specificity of optogenetic stimulation. Behavioral studies on animals carrying a wireless oCI sound processor revealed auditory percepts. This study demonstrates hearing restoration with improved spectral selectivity by an LED-based multichannel oCI system.
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Affiliation(s)
- Daniel Keppeler
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Göttingen Graduate Center for Neurosciences and Molecular Biosciences, University of Göttingen, 37075 Göttingen, Germany
| | - Michael Schwaerzle
- University of Freiburg, Department of Microsystems Engineering (IMTEK), 79110 Freiburg, Germany.,Cluster of Excellence BrainLinks-BrainTools, University of Freiburg, 79110 Freiburg, Germany
| | - Tamas Harczos
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany
| | - Lukasz Jablonski
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany
| | - Alexander Dieter
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Göttingen Graduate Center for Neurosciences and Molecular Biosciences, University of Göttingen, 37075 Göttingen, Germany
| | - Bettina Wolf
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany
| | - Suleman Ayub
- University of Freiburg, Department of Microsystems Engineering (IMTEK), 79110 Freiburg, Germany.,Cluster of Excellence BrainLinks-BrainTools, University of Freiburg, 79110 Freiburg, Germany
| | - Christian Vogl
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Collaborative Research Center 889, University of Göttingen, 37075 Göttingen, Germany
| | - Christian Wrobel
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Center Göttingen, 37099 Göttingen, Germany
| | - Gerhard Hoch
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany
| | - Khaled Abdellatif
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany
| | - Marcus Jeschke
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany
| | - Vladan Rankovic
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany
| | - Oliver Paul
- University of Freiburg, Department of Microsystems Engineering (IMTEK), 79110 Freiburg, Germany.,Cluster of Excellence BrainLinks-BrainTools, University of Freiburg, 79110 Freiburg, Germany
| | - Patrick Ruther
- University of Freiburg, Department of Microsystems Engineering (IMTEK), 79110 Freiburg, Germany. .,Cluster of Excellence BrainLinks-BrainTools, University of Freiburg, 79110 Freiburg, Germany
| | - Tobias Moser
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, 37099 Göttingen, Germany. .,Göttingen Graduate Center for Neurosciences and Molecular Biosciences, University of Göttingen, 37075 Göttingen, Germany.,Auditory Neuroscience and Optogenetics Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany.,Collaborative Research Center 889, University of Göttingen, 37075 Göttingen, Germany.,Multiscale Bioimaging Cluster of Excellence, University Medical Center Göttingen, 37075 Göttingen, Germany.,MPI for Biophysical Chemistry, 37077 Göttingen, Germany
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Moser T, Dieter A. Towards optogenetic approaches for hearing restoration. Biochem Biophys Res Commun 2020; 527:337-342. [DOI: 10.1016/j.bbrc.2019.12.126] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Accepted: 12/23/2019] [Indexed: 01/06/2023]
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Kleinlogel S, Vogl C, Jeschke M, Neef J, Moser T. Emerging approaches for restoration of hearing and vision. Physiol Rev 2020; 100:1467-1525. [DOI: 10.1152/physrev.00035.2019] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Impairments of vision and hearing are highly prevalent conditions limiting the quality of life and presenting a major socioeconomic burden. For long, retinal and cochlear disorders have remained intractable for causal therapies, with sensory rehabilitation limited to glasses, hearing aids, and electrical cochlear or retinal implants. Recently, the application of gene therapy and optogenetics to eye and ear has generated hope for a fundamental improvement of vision and hearing restoration. To date, one gene therapy for the restoration of vision has been approved and undergoing clinical trials will broaden its application including gene replacement, genome editing, and regenerative approaches. Moreover, optogenetics, i.e. controlling the activity of cells by light, offers a more general alternative strategy. Over little more than a decade, optogenetic approaches have been developed and applied to better understand the function of biological systems, while protein engineers have identified and designed new opsin variants with desired physiological features. Considering potential clinical applications of optogenetics, the spotlight is on the sensory systems. Multiple efforts have been undertaken to restore lost or hampered function in eye and ear. Optogenetic stimulation promises to overcome fundamental shortcomings of electrical stimulation, namely poor spatial resolution and cellular specificity, and accordingly to deliver more detailed sensory information. This review aims at providing a comprehensive reference on current gene therapeutic and optogenetic research relevant to the restoration of hearing and vision. We will introduce gene-therapeutic approaches and discuss the biotechnological and optoelectronic aspects of optogenetic hearing and vision restoration.
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Affiliation(s)
| | | | | | | | - Tobias Moser
- Institute for Auditory Neuroscience, University Medical Center Goettingen, Germany
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Moser T. [Molecular Understanding of Hearing - How Does This Matter to the Hearing Impaired?]. Laryngorhinootologie 2018; 97:S214-S230. [PMID: 29905358 PMCID: PMC6541096 DOI: 10.1055/s-0043-121595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This review addresses the advances of our molecular understanding of hearing and how this benefits the hearing impaired. Classical biochemical methods usually fall short in contributing to the analysis of the molecular mechanisms of hearing e. g. in the cochlea, the auditory part of the inner ear, due to the scarcity of the cells of interest. Genetics, molecular cell biology, and physiology, on the other hand, have elucidated the intricate molecular and cellular mechanisms that bring about the outstanding performance of the auditory system. Many of those mechanisms are quite unique and specialized to serve the specific needs of hearing. Hence, their defects often spare other organs and lead to specific non-syndromic deafness. High throughput sequencing can reveal causes of sporadic deafness when combined with careful bioinformatics. Molecular approaches are also helpful for understanding more common forms of hearing impairment such as noise-induced hearing impairment. While molecular therapies are not yet clinically available, careful molecular genetic analysis helps to counsel the hearing impaired subjects.
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Affiliation(s)
- Tobias Moser
- Institut für Auditorische Neurowissenschaften, Universitätsmedizin Göttingen
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Abstract
The synapse between inner hair cells (IHCs) and type I spiral ganglion neurons (SGNs) has been identified as a sensitive structure to noise-induced damage in the mammalian cochlea. Since this synapse provides the major information pathway from the cochlea to the auditory brain, it is important to maintain its integrity. Neurotrophin-3 (NT-3) has been known to play an important role in the development and the functional maintenance of this synapse. Application of exogenous NT-3, or overexpression of this gene in a transgenic animal model, have shown the value to protect this synapse from noise-induced damage. In the present study, NT-3 overexpression was induced by cochlear gene transfection before noise exposure via the use of an adeno-associated viral (AAV) vector. We found that such an overexpression provided a significant synaptic protection against a noise exposure that caused massive damage to the synapses, likely due to it promoting the repair of the synapse after the initial damage.
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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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In vivo genetic manipulation of inner ear connexin expression by bovine adeno-associated viral vectors. Sci Rep 2017; 7:6567. [PMID: 28779115 PMCID: PMC5544751 DOI: 10.1038/s41598-017-06759-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 06/19/2017] [Indexed: 01/03/2023] Open
Abstract
We have previously shown that in vitro transduction with bovine adeno–associated viral (BAAV) vectors restores connexin expression and rescues gap junction coupling in cochlear organotypic cultures from connexin–deficient mice that are models DFNB1 nonsyndromic hearing loss and deafness. The aims of this study were to manipulate inner ear connexin expression in vivo using BAAV vectors, and to identify the optimal route of vector delivery. Injection of a BAAV vector encoding a bacterial Cre recombinase via canalostomy in adult mice with floxed connexin 26 (Cx26) alleles promoted Cre/LoxP recombination, resulting in decreased Cx26 expression, decreased endocochlear potential, increased hearing thresholds, and extensive loss of outer hair cells. Injection of a BAAV vector encoding GFP-tagged Cx30 via canalostomy in P4 mice lacking connexin 30 (Cx30) promoted formation of Cx30 gap junctions at points of contacts between adjacent non-sensory cells of the cochlear sensory epithelium. Levels of exogenous Cx30 decayed over time, but were still detectable four weeks after canalostomy. Our results suggest that persistence of BAAV-mediated gene replacement in the cochlea is limited by the extensive remodeling of the organ of Corti throughout postnatal development and associated loss of non-sensory cells.
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Wen X, Ding S, Cai H, Wang J, Wen L, Yang F, Chen G. Nanomedicine strategy for optimizing delivery to outer hair cells by surface-modified poly(lactic/glycolic acid) nanoparticles with hydrophilic molecules. Int J Nanomedicine 2016; 11:5959-5969. [PMID: 27877041 PMCID: PMC5108623 DOI: 10.2147/ijn.s116867] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Targeted drug delivery to outer hair cells (OHCs) in the cochlea by nanomedicine strategies forms an effective therapeutic approach for treating hearing loss. Surface chemistry plays a deciding role in nanoparticle (NP) biodistribution, but its influence on such distribution in the cochlea remains largely unknown. Herein, we report the first systematic comparison of poly(lactic/glycolic acid) nanoparticles (PLGA NPs) with or without surface modification of hydrophilic molecules for optimizing the delivery to OHCs both in vitro and in vivo. NPs that were surface modified with poloxamer 407 (P407), chitosan, or methoxy poly(ethylene glycol) and the unmodified NPs were highly biocompatible with L929 and House Ear Institute-organ of Corti 1 cells as well as cochlear tissues. Interestingly, among all the examined NPs, P407-PLGA NPs showed the greatest cellular uptake and prominent fluorescence in cochlear imaging. More importantly, we provide novel evidence that the surface-modified NPs reached the organ of Corti and were transported into the OHCs at a higher level. Together, these observations suggest that surface modification with hydrophilic molecules will allow future clinical applications of PLGA NPs, especially P407-PLGA NPs, in efficient hearing loss therapy.
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Affiliation(s)
- Xingxing Wen
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China,Guangdong Provincial Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China
| | - Shan Ding
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China,Guangdong Provincial Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China
| | - Hui Cai
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China,Guangdong Provincial Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China
| | - Junyi Wang
- School of Public Health, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China
| | - Lu Wen
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China
| | - Fan Yang
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China,Guangdong Provincial Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China
| | - Gang Chen
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China,Guangdong Provincial Key Laboratory of Advanced Drug Delivery, Guangdong Pharmaceutical University, Guangzhou, People’s Republic of China
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