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Issue 29, 2018
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A unique nanogel-based platform for enhanced dual mode tumor MR/CT imaging

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We develop a convenient approach to loading both gold nanoparticles (AuNPs) and gadolinium (Gd) within alginate nanogels (AG NGs) for enhanced tumor dual-modal MR/CT imaging applications. In this study, polyethyleneimine (PEI) partially modified with polyethylene glycol (PEG) was used to entrap AuNPs and load gadolinium via chelation. The formed PEI-Au-Gd NPs were used as a crosslinker to crosslink AG NGs with activated carboxyl groups obtained through a double emulsion process. The formed hybrid NGs (AG/PEI-Au-Gd NGs) having a size of 83 ± 21 nm exhibit excellent colloidal stability in aqueous solution and good cytocompatibility in the studied concentration range. In particular, the AG/PEI-Au-Gd NGs exhibit a higher r1 relaxivity (9.16 mM−1 s−1) than acetylated PEI-Au-Gd NPs (PEI.Ac-Au-Gd NPs) and a clinical MR contrast agent and a greater X-ray attenuation performance than conventional iodinated CT contrast agents (e.g., Omnipaque), and they can be more significantly taken up by cancer cells than PEI.Ac-Au-Gd NPs. Furthermore, the AG/PEI-Au-Gd NGs enable effective dual mode MR/CT imaging of cancer cells in vitro as well as a subcutaneous tumor model in vivo. Strikingly, the AG/PEI-Au-Gd NGs exhibit a much better dual-modal MR/CT imaging performance than PEI.Ac-Au-Gd NPs and clinical CT or MR agents in in vivo tumor imaging. The developed AG/PEI-Au-Gd NGs with good biosafety confirmed by histological examinations may be potentially employed as an efficient contrast agent for enhanced dual-modal MR/CT imaging applications.

Graphical abstract: A unique nanogel-based platform for enhanced dual mode tumor MR/CT imaging

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The article was received on 21 Apr 2018, accepted on 09 Jun 2018 and first published on 11 Jun 2018

Article type: Paper
DOI: 10.1039/C8TB01044G
Citation: J. Mater. Chem. B, 2018,6, 4835-4842
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    A unique nanogel-based platform for enhanced dual mode tumor MR/CT imaging

    W. Sun, J. Zhang, C. Zhang, Y. Zhou, J. Zhu, C. Peng, M. Shen and X. Shi, J. Mater. Chem. B, 2018, 6, 4835
    DOI: 10.1039/C8TB01044G

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