Multi-stimuli-responsive dox released from magnetosome for tumor synergistic theranostics

Ming Fong Tsai, Yu Lun Lo, Yuan Chun Huang, Chun Chieh Yu, Yi Ting Wu, Chia Hao Su, Li Fang Wang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

12 Scopus citations


Background: To improve responses to tumor microenvironments for achieving a better therapeutic outcome in combination cancer therapy, poly(ε-caprolactone)-SS-poly (methacrylic acid) diblock copolymer (PCL-SS-PMAA) with a disulfide linkage between the hydrophobic and hydrophilic junctions was synthesized. Materials and Methods: Repeating units of PCL and PMAA in PCL-SS-PMAA were controlled and formulated into polymersomes (PSPps). Truncated octahedral Fe3O4 nanoparti-cles (IONPs) were synthesized and encapsulated to produce IONPs-PSPps NPs and doxorubicin (DOX) was further loaded to produce IONPs-PSPps@DOX NPs for theranostic applications. Results: IONPs-PSPps NPs remained a superparamagnetic property with a saturation mag-netization value of 85 emu⋅gFe3O4 −1 and a relaxivity value of 180 mM−1⋅s−1. Upon exposure to an alternating magnetic field (AMF), IONPs-PSPps NPs increased temperature from 25°C to 54°C within 15 min. Among test groups, the cell apoptosis was greatest in the group exposed to IONPs-PSPps@DOX NPs with AMF and magnet assistance. In vivo T2-weighted magnetic resonance images of A549 tumor-bearing mice also showed highest contrast and greatest tumor suppression in the tumor with AMF and magnet assistance. Conclusion: IONPs-PSPps@DOX NPs are a potential theranostic agent having multifa-ceted applications involving magnetic targeting, MRI diagnosis, hyperthermia and chemotherapy.

Original languageEnglish
Pages (from-to)8623-8639
Number of pages17
JournalInternational Journal of Nanomedicine
StatePublished - 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 Tsai et al.


  • Hyperthermia
  • Magnetic resonance imaging
  • Magnetosome
  • Multi-stimuli-responsive copolymer
  • Theranostics


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