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Here, we report a tannic acid-Fe3+ coordination complex coating that confers magnetic resonance imaging (MRI) theranostic properties to inert nanomaterials. Boron nitride nanosheets (BNS), which lack magnetic field and light responsiveness, were used as a model nonfunctional nanomaterial. Among various catechol derivatives tested (i.e., dopamine, 3,4-dihydroxyphenylacetic acid, gallic acid, and tannic acid), a coating of tannic acid-Fe3+ coordination complex provided the highest magnetic field relaxivity and near infrared (NIR) laser light responsiveness. An in vitro study showed that KB tumor cells treated with tannic acid-Fe3+ coordination complex adsorbed on BNS (TA-Fe/BNS) exhibited higher T1-weighted magnetic resonance contrast compared with plain BNS, and BNS coated with tannic acid or Fe alone. NIR irradiation at 808 nm caused a significant increase in KB tumor cell death after treatment with TA-Fe/BNS compared with other treatments. In vivo MRI imaging revealed tumor accumulation of intravenously administered TA-Fe/BNS. Guided by MRI information, application of focused laser irradiation onto tumor tissues resulted in complete tumor ablation. These results support the potential of TA-Fe/BNS for MRI theranostics. Moreover, this study suggests the wide applicability of TA-Fe noncovalent coating as biocompatible and facile tool for converting nonfunctional early-generation nanomaterials into functional new nanomaterials, opening new opportunities for their use in translational biomedical applications such as MRI theranostics. Copyright © 2020 Elsevier B.V. All rights reserved.


Gayong Shim, Seungbeom Ko, Joo Yeon Park, Ju Han Suh, Quoc-Viet Le, Dongyoon Kim, Young Bong Kim, Geun Ho Im, Hun Nyun Kim, Yearn Seong Choe, Jihee Cho, Sanghee Kim, Yu-Kyoung Oh. Tannic acid-functionalized boron nitride nanosheets for theranostics. Journal of controlled release : official journal of the Controlled Release Society. 2020 Nov 10;327:616-626

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PMID: 32916228

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