Chapter 12

Ultrasound-Mediated Delivery Systems: Using Nano/Microbubbles or Bubble Liposomes

Kazuo Maruyama

Kazuo Maruyama

Teikyo University, Tokyo, Japan

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Ryo Suzuki

Ryo Suzuki

Teikyo University, Tokyo, Japan

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Yusuke Oda

Yusuke Oda

Teikyo University, Tokyo, Japan

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Yoko Endo-Takahashi

Yoko Endo-Takahashi

Teikyo University, Tokyo, Japan

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Yoichi Negishi

Yoichi Negishi

Tokyo University of Pharmacy and Life Sciences, Tokyo, Japan

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First published: 04 January 2013
Citations: 1

Summary

The combination of ultrasound exposure and bubbles, including microbubbles, nanobubbles, and bubble liposomes, can be utilized to enhance drug delivery efficiency in ultrasound-mediated delivery systems. Ultrasound-induced microstreams/microjets in fluid surrounding the bubbles form transient pores in the plasma membrane through which exogenous materials such as plasmid DNA, siRNA, proteins, and/or drugs in the fluid can then enter the cell.

Cells suspended with bubbles and plasmid DNA or siRNA are exposed to ultrasound for up to a few tens of seconds to allow for transfection over a short period of time. Plasmid DNA and siRNA are directly introduced into the cytoplasm, enabling effective and rapid transfection in the presence of high serum nuclease levels. The combination of ultrasound exposure and bubbles is also a novel strategy for antigen delivery in dendritic cell (DC)-based cancer immunotherapy, thus making possible the prevention of metastasis in therapeutic models of antigen delivery into DCs.

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