Abstract |
Theranostics means a therapy conducted in a diagnosis-guided manner. For theranostics of solid tumors by means of ultrasound, we designed a nano-sized emulsion containing perfluoropentane (PFC5). This emulsion can be delivered into tumor tissues through the tumor vasculatures owing to its nano-size, and the emulsion is transformed into a micron-sized bubble upon sonication through phase transition of PFC5. The micron-sized bubbles can more efficiently absorb ultrasonic energy for better diagnostic images and can exhibit more efficient ultrasound-driven therapeutic effects than nano-sized bubbles. For more efficient tumor delivery, smaller size is preferable, yet the preparation of a smaller emulsion is technically more difficult. In this paper, we used a bath-type sonicator to successfully obtain small PFC5-containing emulsions in a diameter of ca. 200nm. Additionally, we prepared these small emulsions at 40°C, which is above the boiling temperature of PFC5. Accordingly, we succeeded in obtaining very small nano- emulsions for theranostics through a very facile method.
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Authors | Kouichi Shiraishi, Reiko Endoh, Hiroshi Furuhata, Masamichi Nishihara, Ryo Suzuki, Kazuo Maruyama, Yusuke Oda, Jun-ichiro Jo, Yasuhiko Tabata, Jun Yamamoto, Masayuki Yokoyama |
Journal | International journal of pharmaceutics
(Int J Pharm)
Vol. 421
Issue 2
Pg. 379-87
(Dec 15 2011)
ISSN: 1873-3476 [Electronic] Netherlands |
PMID | 22023827
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2011 Elsevier B.V. All rights reserved. |
Chemical References |
- Emulsions
- Fluorocarbons
- Polyethylene Glycols
- perfluoropentane
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Topics |
- Animals
- Drug Compounding
- Emulsions
- Female
- Fluorocarbons
(blood, chemistry, pharmacokinetics)
- Mice
- Mice, Inbred BALB C
- Nanoparticles
(chemistry)
- Neoplasms
(diagnosis, drug therapy)
- Particle Size
- Polyethylene Glycols
(chemistry, pharmacokinetics)
- Sonication
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