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Multi-Stimuli-Responsive DOX Released from Magnetosome for Tumor Synergistic Theranostics

Authors Tsai MF, Lo YL, Huang YC, Yu CC, Wu YT, Su CH, Wang LF

Received 3 September 2020

Accepted for publication 16 October 2020

Published 5 November 2020 Volume 2020:15 Pages 8623—8639


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Ebrahim Mostafavi

Ming-Fong Tsai,1,* Yu-Lun Lo,1,* Yuan-Chun Huang,1 Chun-Chieh Yu,2 Yi-Ting Wu,1 Chia-Hao Su,2,3 Li-Fang Wang1,4

1Department of Medicinal & Applied Chemistry, College of Life Sciences, Kaohsiung Medical University, Kaohsiung 807, Taiwan; 2Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan; 3Department of Biomedical Imaging and Radiological Sciences, National Yang Ming University, Taipei 112, Taiwan; 4Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan

*These authors contributed equally to this work

Correspondence: Li-Fang Wang
Department of Medicinal & Applied Chemistry, College of Life Sciences, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan
Tel +886-7-312-1101 Ext. 2217
Fax +886-7-312-5339
Chia-Hao Su
Professor of Molecular Imaging & Nanotechnology, Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, 123 Dapi Road, Niaosong District, Kaohsiung 83301, Taiwan
Tel +886-7-731-7123 Ext. 8592
Fax +886-7-731-7123 Ext. 8569

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 nanoparticles (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 magnetization 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 multifaceted applications involving magnetic targeting, MRI diagnosis, hyperthermia and chemotherapy.

Keywords: magnetosome, multi-stimuli-responsive copolymer, theranostics, hyperthermia, magnetic resonance imaging

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