Theranostics 2017; 7(4):846-854. doi:10.7150/thno.17251

Research Paper

Phase-transitional Fe3O4/perfluorohexane Microspheres for Magnetic Droplet Vaporization

Ronghui Wang1, Yang Zhou1, Ping Zhang1, Yu Chen3, Wei Gao1, Jinshun Xu1, Hangrong Chen3, Xiaojun Cai3, Kun Zhang3, Pan Li1, Zhigang Wang1, Bing Hu2✉, Tao Ying2✉, Yuanyi Zheng1,2✉

1. Second Affiliated Hospital of Chongqing Medical University, 76 Linjiang Road, Chongqing, 400016, P. R. China
2. Shanghai Institute of Ultrasound in Medicine, Shanghai Jiaotong University affiliated Sixth People's Hospital, Shanghai, 200233, P. R. China.
3. State Key Laboratory of High Performance Ceramics and Superfine microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, P. R. China

Abstract

Activating droplets vaporization has become an attractive strategy for ultrasound imaging and physical therapy due to the significant increase in ultrasound backscatter signals and its ability to physically damage the tumor cells. However, the current two types of transitional droplets named after their activation methods have their respective limitations. To circumvent the limitations of these activation methods, here we report the concept of magnetic droplet vaporization (MDV) for stimuli-responsive cancer theranostics by a magnetic-responsive phase-transitional agent. This magnetic-sensitive phase-transitional agent—perfluorohexane (PFH)-loaded porous magnetic microspheres (PFH-PMMs), with high magnetic-thermal energy-transfer capability, could quickly respond to external alternating current (AC) magnetic fields to produce thermal energy and trigger the vaporization of the liquid PFH. We systematically demonstrated MDV both in vitro and in vivo. This novel trigger method with deep penetration can penetrate the air-filled viscera and trigger the vaporization of the phase-transitional agent without the need of pre-focusing lesion. This unique MDV strategy is expected to substantially broaden the biomedical applications of nanotechnology and promote the clinical treatment of tumors that are not responsive to chemical therapies.

Keywords: Magnetic droplet vaporization, Phase transition, Ultrasound imaging.

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) License. See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Wang R, Zhou Y, Zhang P, Chen Y, Gao W, Xu J, Chen H, Cai X, Zhang K, Li P, Wang Z, Hu B, Ying T, Zheng Y. Phase-transitional Fe3O4/perfluorohexane Microspheres for Magnetic Droplet Vaporization. Theranostics 2017; 7(4):846-854. doi:10.7150/thno.17251. Available from http://www.thno.org/v07p0846.htm