Focused Ultrasound Enabled Trans-Blood Brain Barrier Delivery of Gold Nanoclusters: Effect of Surface Charges and Quantification Using Positron Emission Tomography.

Small 2018 07 2;14(30):e1703115. Epub 2018 Jul 2.

Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO, 63110, USA.

Focused ultrasound (FUS) technology is reported to enhance the delivery of Cu-integrated ultrasmall gold nanoclusters ( Cu-AuNCs) across the blood-brain barrier (BBB) as measured by positron emission tomography (PET). To better define the optimal physical properties for brain delivery, Cu-AuNCs with different surface charges are synthesized and characterized. In vivo biodistribution studies are performed to compare the individual organ uptake of each type of Cu-AuNCs. Quantitative PET imaging post-FUS treatment shows site-targeted brain penetration, retention, and diffusion of the negative, neutral, and positive Cu-AuNCs. Autoradiography is performed to compare the intrabrain distribution of these nanoclusters. PET Imaging demonstrates the effective BBB opening and successful delivery of Cu-AuNCs into the brain. Of the three Cu-AuNCs investigated, the neutrally charged nanostructure performs the best and is the candidate platform for future theranostic applications in neuro-oncology.

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http://dx.doi.org/10.1002/smll.201703115DOI Listing
July 2018

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