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Observed Effects of Whole-Brain Radiation Therapy on Focused Ultrasound Blood-Brain Barrier Disruption. | LitMetric
As focused ultrasound for blood-brain barrier disruption (FUS-BBBD) has progressed to human application, it has become necessary to consider the potential effects of prior irradiation treatments. Using a murine model, we examined the effects of whole-brain irradiation on FUS-BBBD. We first subjected half of the experimental cohort to daily 3-Gy whole-brain irradiation for 10 consecutive days. Then, microbubble-assisted FUS-BBBD was performed unilaterally while the contralateral sides served as unsonicated controls. FUS-BBBD, as evident by measuring the fluorescence yield of extravasated trypan blue dye, was identified at all sites with minimal or no apparent pathology. The peak fluorescence intensity caused by extravasated dye in the sonicated region was 17.5 ± 12.1% higher after radiation and FUS-BBBD than after FUS-BBBD alone, suggesting that prior radiation of the brain may be a sensitizing factor for FUS-BBBD. Radiation alone-without FUS-BBBD-resulted in mild BBB disruption. Hemorrhagic petechiae were observed in 9 of 12 radiated brains, with 77% of them clearly located outside the sonicated area; no petechiae were found in non-irradiated animals. This radiation protocol did not appear to increase the risk for vascular damage associated with FUS-BBBD.
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