An efficient method for fractionated whole rodent brain radiation.

Area of Science:

• Neuroscience
• Radiation Oncology
• Animal Models

Background:

• Current rodent models for whole brain radiotherapy often use single high doses, which do not accurately reflect clinical fractionated treatment protocols.
• There is a need for efficient and safe rodent models to study the mechanisms of whole brain radiotherapy side effects and evaluate potential neuroprotective measures.

Purpose of the Study:

• To describe an efficient method for performing repetitive, fractionated whole brain radiotherapy in a rodent model.
• To establish a model that mimics clinical radiation delivery for studying treatment side effects and testing interventions.

Main Methods:

• Rats were subjected to fractionated whole brain irradiation over four consecutive days, receiving cumulative doses of 20 Gy or 40 Gy.
• Sham-irradiated control groups underwent the same procedure without radiation exposure.
• A specialized setup with collimators allowed simultaneous irradiation of four rats and dose monitoring.

Main Results:

• Fourteen days post-irradiation, animals showed significantly reduced open-field activity in both 20 Gy and 40 Gy groups compared to controls.
• No significant cognitive deficits were observed in the Morris water maze test at 14 days.
• Histopathological examination at six weeks revealed no significant vascular changes, demyelination, or white matter necrosis in any group.

Conclusions:

• The developed method provides an efficient and safe approach for fractionated high-dose irradiation of the rodent brain.
• The model holds potential for further investigation by increasing cumulative dosage or dose per fraction to induce greater radiation toxicity.
• This model can facilitate research into radiotherapy side effects and the efficacy of neuroprotective agents.