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Related Experiment Video

Updated: Apr 30, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

Close-field electroporation gene delivery using the cochlear implant electrode array enhances the bionic ear.

Jeremy L Pinyon¹, Sherif F Tadros, Kristina E Froud

¹Translational Neuroscience Facility and Department of Physiology, School of Medical Sciences, University of New South Wales, UNSW Australia, Sydney, New South Wales 2052, Australia.

Science Translational Medicine

|April 25, 2014

Summary

Neurotrophin gene therapy using cochlear implants promotes spiral ganglion neurite regeneration in guinea pigs. This enhances neural interfaces and improves bionic ear performance for profound hearing loss.

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Last Updated: Apr 30, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

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Published on: June 16, 2022

The Miniature Pig: A Large Animal Model for Cochlear Implant Research

The Miniature Pig: A Large Animal Model for Cochlear Implant Research

Published on: July 28, 2022

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Published on: October 11, 2024

Area of Science:

Biomedical Engineering
Neuroscience
Regenerative Medicine

Background:

Cochlear implants are successful but limited by neural interface performance.
Current stimulation methods spread, disrupting the cochlear nerve's tonotopic map.
Spiral ganglion neurons often atrophy in sensorineural hearing loss models.

Purpose of the Study:

To investigate neurotrophin gene therapy integrated with cochlear implants for improving neural interfaces.
To stimulate spiral ganglion neurite regeneration in a guinea pig model of sensorineural deafness.

Main Methods:

Utilized cochlear implant electrode arrays for close-field electroporation to deliver gene therapy.
Transduced mesenchymal cells with a DNA construct for brain-derived neurotrophic factor (BDNF) and GFP reporter.
Evaluated neurite regeneration and neural remodeling using electrically evoked auditory brainstem responses.

Main Results:

BDNF gene therapy stimulated regeneration of atrophied spiral ganglion neurites.
Regenerated neurites extended towards cochlear implant electrodes, enabling bipolar stimulation.
BDNF therapy resulted in lower stimulus thresholds and expanded dynamic range compared to controls.

Conclusions:

Integrated neurotrophin gene therapy can enhance cochlear implant performance by promoting neural regeneration.
This approach offers a potential strategy for improving neural interfaces in bionic devices.
The findings suggest broader applications for molecular medicine in neural repair.