A nanomotor-based active delivery system for intracellular oxygen transport

Summary

This cell-delivery study asks whether active nanoscale motion can accelerate intracellular oxygen transport and sustain cells under hypoxia. The system linked acoustically propelled gold-nanowire motors to red-blood-cell-membrane-cloaked perfluorocarbon nanoemulsions, combining rapid movement with a high-capacity oxygen reservoir. Under ultrasound, the composite motors moved through the medium and increased oxygen delivery into J774 macrophages. Once internalized, the perfluorocarbon component released oxygen gradually. During seventy-two hours of hypoxic culture, cells treated with actively propelled carriers retained 84.4% viability, compared with 44.4% for free membrane-cloaked nanoemulsions and 32.7% for the same motor construct without active propulsion. The principal finding is that acoustic movement materially improves delivery beyond what the oxygen carrier or passive composite achieves alone, while sustained release maintains the intracellular benefit. Its significance is a platform for actively transporting gases into target cells, with oxygen serving as the demonstrated cargo and other gases proposed as future possibilities. The abstract does not address in vivo targeting, ultrasound exposure limits, gold-motor clearance, effects in other cell types, or whether the viability advantage translates into treatment of ischemic or hypoxic disease.