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Ferromagnetic hyperthermia: functional and histopathologic effects on normal rabbit ocular tissue
T G Murray1, R A Steeves, L Gentry
1Department of Opthalmology and Radiation Oncology, University of Miami, Bascom Palmer Eye Institute, FL 33101-6880, USA.
Summary
Ferromagnetic hyperthermia (FMH) effectively delivered focal heating to rabbit eyes. This study demonstrates localized thermal effects with no diffuse ocular toxicity, suggesting potential for targeted ocular treatments.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Oncology
Background:
- Ferromagnetic hyperthermia (FMH) has shown promise in preclinical cancer models.
- Previous studies evaluated FMH in ocular melanoma models.
- The effects of focal heating on normal ocular tissues require further investigation.
Purpose of the Study:
- To assess the safety and efficacy of focal hyperthermia in normal rabbit eyes.
- To determine the extent of thermal effects from implanted ferromagnetic seeds.
- To evaluate potential ocular toxicity associated with FMH.
Main Methods:
- Ferromagnetic seeds were implanted onto an episcleral plaque in rabbit eyes.
- Eyes were heated to 48°C or 54°C using an oscillating magnetic field for 60 minutes.
- Ocular effects were monitored via ophthalmoscopy, fundus photography, electroretinography, and histopathology.
Main Results:
- Thermal effects were confined to the plaque-covered area, with transient retinal whitening and exudative detachments.
- Electroretinography showed minimal changes in a- and b-wave amplitudes.
- Histopathology revealed localized chorioretinal scarring, with no signs of hemorrhage, infection, cataract, or scleral thinning.
Conclusions:
- FMH can achieve focal heating in normal rabbit eyes with temperatures up to 54°C for 60 minutes.
- The study demonstrates the focal containment of thermal effects, indicating a lack of diffuse ocular toxicity.
- These findings support the potential of FMH as a localized treatment modality for ocular conditions.
