Ultrasound-activated drug release with extracellular vesicles.
Shi Xi X, He Weilong W, Xu Haiyue H, Dasgupta Rinki R et al.
Precise, noninvasive targeting and controlled drug release to the nervous system can transform both basic research and clinical therapy. Ultrasound combined with artificial carriers offers a promising approach for precise, noninvasive drug release. Here, we report a focused ultrasound (FUS)-responsive delivery system based on extracellular vesicles (EVs), which are naturally occurring, biocompatible phospholipid nanocarriers. To enable ultrasound responsiveness, the lipid-gas phase-transition material perfluoropentane (PFP) is co-encapsulated with therapeutic agents into EVs via low-temperature sonication. The resulting EVs are 100-200 nm in size and demonstrate efficient, on-demand release upon ultrasound stimulation. In primary cultured neurons, FUS-triggered release from EVs loaded with PFP and lidocaine suppresses neuronal activity with minimal cytotoxicity. We further demonstrate in vivo modulation of pain sensitivity in rats. Overall, this EV-based platform enables safe, ultrasound-activated drug delivery and supports therapeutic applications of lipid nanocarriers.