Theranostic nanoparticles for MRI-guided thermochemotherapy: "tight" clustering of magnetic nanoparticles boosts relaxivity and heat-generation power

Koichiro Hayashi, Yoshitaka Sato, Wataru Sakamoto, Toshinobu Yogo

研究成果: Contribution to journalArticle査読

26 被引用数 (Scopus)

抄録

Magnetic-resonance-imaging (MRI)-guided magnetic thermochemotherapy is a potentially invasive technique combining diagnosis and treatment. It requires the development of multifunctional nanoparticles with (1) biocompatibility, (2) high relaxivity, (3) high heat-generation power, (4) controlled drug release, and (5) tumor targeting. Here, we show the synthesis of such multifunctional nanoparticles ("Core-Shells") and the feasibility of MRI-guided magnetic thermochemotherapy using the synthesized nanoparticles. "Tight" iron-oxide nanoparticle clustering to zero interparticle distance within the Core-Shells boosts the relaxivity and heat-generation power while maintaining biocompatibility. The initial Core-Shell drug release occurs in response to an alternating magnetic field (AMF) and continues gradually after removal of the AMF. Thus, a single Core-Shell dose realizes continuous chemotherapy over a period of days or weeks. The Core-Shells accumulate in abdomen tumors, facilitating MRI visualization. Subsequent AMF application induces heat generation and drug release within the tumors, inhibiting their growth. Core-Shell magnetic thermochemotherapy exhibits significantly higher therapeutic efficacy than both magnetic hyperthermia and chemotherapy alone. More importantly, there are minimal side effects. The findings of this study introduce new perspectives regarding the development of materials for MRI, magnetic hyperthermia, and drug delivery systems. Both conventional and novel iron-oxide-based materials may render theranostics (i.e., techniques fusing diagnosis and treatment) feasible.

本文言語英語
ページ(範囲)95-105
ページ数11
ジャーナルACS Biomaterials Science and Engineering
3
1
DOI
出版ステータス出版済み - 1 9 2017
外部発表はい

All Science Journal Classification (ASJC) codes

  • Biomaterials
  • Biomedical Engineering

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