The effects of albumin-coated microbubbles in DNA delivery mediated by therapeutic ultrasound

Journal of Controlled Release : Official Journal of the Controlled Release Society
Maayan Duvshani-EshetMarcelle Machluf

Abstract

The application of therapeutic ultrasound (TUS) in combination with contrast agents (USCA) to mediate gene delivery relies on the understanding of the bioeffects involved. The objective of this study was to evaluate the various bioeffects generated by albumin-coated microbubbles: Optison, an USCA, when applied with TUS operated for 10-30 min, on cells and on DNA transfection. This study reveals that Optison microbubbles were still acoustically active after long-term TUS application of 30 min. Optison enhances TUS-gene transfection by increasing the number of plasmids in the cells and also by distributing the plasmids to more cells, without significant decrease in cell viability. Optison also interacts with the DNA to further enhance transfection in a mechanism not necessarily involving cavitation. However, Optison affects mainly the cell cytoplasmatic membrane, without interfering with DNA intracellular trafficking. Using high-resolution scanning electron microscopy (HRSEM), the bioeffects on cell membrane induced by TUS-Optison were observed, demonstrating that Optison lead to a rougher surface, characterized by depressions that are reversible within 24-h post TUS. These effects are different from those observed when only TUS ...Continue Reading

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