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Labeling of Adipose-Derived Stem Cells by Oleic-Acid-Modified Magnetic Nanoparticles

Authors

  • Lian Cen,

    1. Department of Plastic and Reconstructive Surgery Shanghai 9th People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road, Shanghai 200011 (P. R. China)
    2. National Tissue Engineering Center of China No.100, Qin Zhou Road, Shanghai 200235 (P. R. China)
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  • Koon Gee Neoh,

    1. Department of Chemical and Biomolecular Engineering National University of Singapore, Kent Ridge Singapore 119260 (Singapore)
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  • Jian Sun,

    1. Department of Plastic and Reconstructive Surgery Shanghai 9th People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road, Shanghai 200011 (P. R. China)
    2. National Tissue Engineering Center of China No.100, Qin Zhou Road, Shanghai 200235 (P. R. China)
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  • Feixiong Hu,

    1. Department of Chemical and Biomolecular Engineering National University of Singapore, Kent Ridge Singapore 119260 (Singapore)
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  • Wei Liu,

    1. Department of Plastic and Reconstructive Surgery Shanghai 9th People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road, Shanghai 200011 (P. R. China)
    2. National Tissue Engineering Center of China No.100, Qin Zhou Road, Shanghai 200235 (P. R. China)
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  • Lei Cui,

    Corresponding author
    1. Department of Plastic and Reconstructive Surgery Shanghai 9th People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road, Shanghai 200011 (P. R. China)
    2. National Tissue Engineering Center of China No.100, Qin Zhou Road, Shanghai 200235 (P. R. China)
    • Department of Plastic and Reconstructive Surgery Shanghai 9th People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road, Shanghai 200011 (P. R. China).
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  • Yilin Cao

    Corresponding author
    1. Department of Plastic and Reconstructive Surgery Shanghai 9th People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road, Shanghai 200011 (P. R. China)
    2. National Tissue Engineering Center of China No.100, Qin Zhou Road, Shanghai 200235 (P. R. China)
    • Department of Plastic and Reconstructive Surgery Shanghai 9th People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road, Shanghai 200011 (P. R. China).
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Abstract

The in vivo tracking of adipose derived stem cells (ASCs) is of essential concern when they are used as seed cells in tissue engineering. This study explores the feasibility of using magnetic nanoparticles (MNs), a type of contrast agents in magnetic resonance imaging (MRI), to label ASCs such that the labeled ASCs could be tracked in vivo by MRI non-invasively and repeatedly. To do this, MNs of <10 nm surface-coated with oleic acid are synthesized via a high-temperature solution-phase reaction. Cytotoxicity of the as-synthesized MNs at concentrations up to 0.1 mg mL−1 on 104 cells mL−1 ASCs is evaluated by LDH release. Since only minor cytotoxicity is detected, the effects of the labeling technique on cellular behaviors and uptake by labeled cells are investigated. Cell proliferation and differentiation with and without MNs are compared. The results show that proliferation of ASCs (104 cells mL−1) labeled by MNs (0.05 mg mL−1) is significantly enhanced and dependent on the labeling time. The MNs are located in the vesicles within cytoplasm of ASCs. The cellular uptake reaches as high as ∼180 pg/cell. Nevertheless, the labeled ASCs still maintained adipogenic and osteogenic differentiation. Hence, the feasibility of labeling ASCs by oleic acid coated MNs is ascertained and it was better to label the cells during their quiescent stage. The labeled ASCs can also be in vivo detected by MRI in a subcutaneous model in vivo. Further MRI tracking of the labeled ASCs in long-term follow-up would thus follow this current study.

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