Development of high-efficiency superparamagnetic drug delivery system with MPI imaging capability

作者：Shi Bai, Xiaodan Zhang, Yuqi Zou, Yu-xi Lin, Zhiyao Liu, Kewen Li, Huang Ping, Takashi Yoshida, Yili Liu, Mingshan Li, Wei Zhang, Xiaoju Wang, Min Zhang, Cheng Du · 发表于：Frontiers in Bioengineering and Biotechnology · 年份：2024 · DOI：10.3389/fbioe.2024.1382085 · 被引用次数：8 · 研究领域：Characterization and Applications of Magnetic Nanoparticles、Geomagnetism and Paleomagnetism Studies、Minerals Flotation and Separation Techniques

In this study, a high-efficiency superparamagnetic drug delivery system was developed for preclinical treatment of bladder cancer in small animals. Two types of nanoparticles with magnetic particle imaging (MPI) capability, i.e., single- and multi-core superparamagnetic iron oxide nanoparticles (SPIONs), were selected and coupled with bladder anti-tumor drugs by a covalent coupling scheme. Owing to the minimal particle size, magnetic field strengths of 270 mT with a gradient of 3.2 T/m and 260 mT with a gradient of 3.7 T/m were found to be necessary to reach an average velocity of 2 mm/s for single- and multi-core SPIONs, respectively. To achieve this, a method of constructing an in vitro magnetic field for drug delivery was developed based on hollow multi-coils arranged coaxially in close rows, and magnetic field simulation was used to study the laws of the influence of the coil structure and parameters on the magnetic field. Using this method, a magnetic drug delivery system of single-core SPIONs was developed for rabbit bladder therapy. The delivery system consisted of three coaxially and equidistantly arranged coils with an inner diameter of Φ50 mm, radial height of 85 mm, and width of 15 mm that were positioned in close proximity to each other. CCK8 experimental results showed that the three types of drug-coupled SPION killed tumor cells effectively. By adjusting the axial and radial positions of the rabbit bladder within the inner hole of the delivery coil structure, th...