Magnetically Assisted Drug Delivery of Topical Eye Drops Maintains Retinal Function In Vivo in Mice

Area of Science:

• Ophthalmology
• Nanotechnology
• Genetics

Background:

• Bardet-Biedl syndrome (BBS) causes retinal degeneration with limited treatment options.
• Current treatments require invasive injections, unsuitable for pediatric patients.
• Non-invasive retinal drug delivery is crucial for BBS treatment adaptation.

Purpose of the Study:

• To develop and test a non-invasive, topical, magnetically assisted delivery system for retinal drug delivery.
• To investigate the efficacy of magnetic nanoparticles (MNPs) carrying anti-unfolded protein response (UPR) drugs for BBS.
• To establish a needle-free method for treating retinal degeneration.

Main Methods:

• Developed a topical delivery system using magnetic nanoparticles (MNPs) to carry guanabenz and valproic acid.
• Utilized magnetic resonance imaging (MRI) to confirm MNP presence in the retina of Bbs mice.
• Validated photoreceptor localization of MNPs using transmission electron microscopy (TEM).
• Assessed therapeutic effects using electroretinogram (ERG) recordings.

Main Results:

• Demonstrated successful MNP delivery to the retina via topical administration in Bbs mice.
• Confirmed MNP localization within photoreceptor cells.
• Showed maintained light detection in treated Bbs mice, indicating biological efficacy.
• This is the first in vivo demonstration of magnetic drug targeting to photoreceptors via topical application.

Conclusions:

• The developed magnetically assisted system provides efficient, non-invasive drug delivery to the retina.
• This needle-free technology offers a promising therapeutic approach for Bardet-Biedl syndrome.
• The system has potential applications for various retinal degenerations and ocular diseases.