UVA Health study shows ultrasound opens blood-brain barrier for brain tumor drug delivery
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UVA Health researchers have shown that focused ultrasound can temporarily open the blood-brain barrier to deliver drugs directly to gliomas in mice. The method was equally or more effective in tumor tissue compared to healthy brain tissue, with medium-sized molecules achieving the best penetration. The findings, published recently, suggest potential for improving chemotherapy and immunotherapy delivery, though human trials have not yet begun.
The Ultrasound Technique
Researchers at UVA Health injected microbubbles into the bloodstream of mice with gliomas, the most common malignant brain tumor in adults. Focused ultrasound was then applied to the target area, causing the microbubbles to oscillate and temporarily open the blood-brain barrier. This created a ‘window’ for drugs to enter the tumor directly without surgery.
Efficacy and Molecule Size
Using a new MRI method, the team measured drug penetration and found gliomas did not hinder delivery; in some cases, it was more effective than in healthy brain tissue. The efficiency varied by molecule size: medium-sized molecules passed through the temporarily opened barrier best, while very small or very large molecules penetrated less well. The results confirm the feasibility of the approach for brain tumor treatment.
Potential Clinical Applications
The researchers believe the technology could enhance various brain tumor therapies, including chemotherapy, immunotherapy, and potentially gene therapy. However, the findings are currently limited to experiments on laboratory mice. No human clinical trials have been conducted, so clinical application remains distant.
What's Next
The research team is expected to pursue preclinical studies to further optimize molecule selection and delivery parameters. It remains unclear when human trials might begin, given the complex regulatory and safety hurdles for ultrasound-mediated brain drug delivery.
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UVA Health study shows ultrasound opens blood-brain barrier for brain tumor drug delivery
