Minimally invasive drug delivery to the cochlea through application of nanoparticles to the round window membrane


Buckiova, Daniela, Ranjan, Sanjeev, Newman, Tracey A., Johnston, Alexander H., Sood, Rohit, Kinnunen, Paavo K.J., Popelář, Jiří, Chumak, Tetyana and Syka, Josef (2012) Minimally invasive drug delivery to the cochlea through application of nanoparticles to the round window membrane. Nanomedicine, 7, (9), 1339-1354. (doi:10.2217/nnm.12.5). (PMID:22475648).

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Description/Abstract

Direct drug delivery to the cochlea is associated with the risk of irreversible damage to the ear. In this study liposome and polymersome nanoparticles (NPs), both formed from amphiphilic molecules (lipids in liposomes, block copolymers in polymersomes), were tested as potential tools for drug delivery to the cochlea through application onto the round window membrane (RWM) in adult mice (strain C3H). One day after RWM application both types of NPs labelled with fluorescent markers were identified in the spiral ganglion in all cochlear turns without producing any distinct morphological or functional damage to the inner ear. NPs were detected, although to a lesser extent, in the organ of Corti and the lateral wall. The potential of liposome and polymersome NPs as therapeutic delivery systems into the cochlea via the RWM was evaluated using disulfiram, a neurotoxic agent as a model payload. Disulfiram-loaded NP delivery resulted in significant decrease in the number of spiral ganglion cells starting two days post-application, with associated pronounced hearing loss reaching 20-35 dB two weeks post-application as assessed through auditory brainstem responses. No changes in hair cell morphology and function (as assessed by recording of otoacoustic emissions) were detected after disulfiram-loaded NP application. No effects were observed in controls where solution of free disulfiram was similarly administered. The results demonstrate that polymersome and liposome NPs are capable of carrying a payload into the inner ear that elicits a biological effect, with consequences measurable by a functional readout.

Item Type: Article
ISSNs: 1743-5889 (print)
1748-6963 (electronic)
Subjects: R Medicine > RF Otorhinolaryngology
R Medicine > RM Therapeutics. Pharmacology
R Medicine > RZ Other systems of medicine
Divisions: Faculty of Medicine
ePrint ID: 207167
Date Deposited: 11 Jan 2012 11:43
Last Modified: 14 Apr 2014 11:09
Projects:
3g-Nanotechnology based targeted drug delivery using the inner ear as a model target organ (NANOEAR)
Funded by: European Commission - FP6 (26556)
1 November 2006 to 31 October 2011
URI: http://eprints.soton.ac.uk/id/eprint/207167

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