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Partial deuteration and blood-brain barrier (BBB) permeability
Y Nakagawa1, H Hatanaka, M Moritani
1Department of Neurosurgery, National Kagawa Children's Hospital, Japan.
Acta Neurochirurgica. Supplementum
|January 1, 1994
Summary
Partial deuteration of body water in rats for Boron Neutron Capture Therapy (BNCT) can cause brain edema and protein leakage, impacting treatment efficacy for malignant brain tumors.
Area of Science:
- Biomedical Engineering
- Radiosurgery
- Neuroscience
Background:
- Boron Neutron Capture Therapy (BNCT) utilizes nuclear reactions for malignant brain tumor treatment.
- Partial deuteration of body water is employed to enhance neutron penetration for deep-seated tumors.
Purpose of the Study:
- To investigate the effects of partial body water deuteration on the blood-brain barrier (BBB) function.
- To assess changes in brain water content and protein permeability under deuteration.
Main Methods:
- Wistar rats received heavy water (D2O) to achieve partial deuteration.
- Brain water content was measured using the freeze-dry method.
- 125-I labeled albumin was used as a tracer to measure protein permeability.
Main Results:
- Deuteration exceeding 10% body water induced mild brain edema (water leakage).
- Deuteration above 30% body water resulted in significant protein leakage across the BBB.
- These findings suggest potential implications for boron compound distribution in BNCT.
Conclusions:
- Partial body water deuteration impacts BBB integrity, potentially affecting BNCT efficacy.
- Increased brain water content and protein leakage are dose-dependent effects of deuteration.
- Further research is needed to optimize deuteration levels for safe and effective BNCT.