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By preventing more than 98% of currently used pharamaceutical agents from entering the brain, the blood-brain barrier critically reduces the ability of therapeutics to treat a variety of central nervous system (CNS) disorders including glioblastoma and neurodegenerative diseases. Focused ultrasound (FUS) mediated microbubble oscillation and subsequent blood brain barrier (BBB) permeabilization has been explored as a powerful non-invasive strategy for the delivery of circulating therapeutic agents into the CNS. FUS in conjunction with microbubbles has been shown to facilitate non-damaging, reversible and localized disruption of the BBB, leading to substantial increases in nanoparticle (NP) concentrations in ultrasound-treated tissue. Once beyond the BBB, the extracellular matrix acts as a steric and adhesive barrier and limits NP distribution. Coating sub-100 nm nanoparticles with a dense brush layer of polyethylene glycol (PEG) to limit the interactions with the ECM leads to a significant improvement of their diffusivity in brain tissue. The current study investigates the ability of FUS to deliver densely PEGylated brain penetrating cationic polymer-based gene vectors across the BBB to mediate robust and long-term transgene expression.

Localized delivery of non-viral gene-bearing nanoparticles into the rat brain following focused ultrasound-mediated BBB opening