Abstract
Due to its small particle size, high specific surface area, functional capability and long-term stable fluorescence, nanodiamond (ND) has been widely used in biomedical applications including fluorescent probes, drug delivery and biological imaging. Nevertheless, the metabolism of ND and its derivatives is not yet well understood for diverse biomedical applications. In this study, to evaluate the cytotoxicity and biodistribution of the ND derivative, pure ND was functionalized with ethylenediamine (EDA) as a linker (ND-EDA) and then covalently labeled with an organic fluorescent dye called calcein. The modified ND is referred to as ND-EDA-calcein. Even at the maximum dose of 0.1 mg·mL−1, the in vitro results for ND-EDA-calcein against HepG2 and LO2 cell lines showed negligible cytotoxicity, which was in line with the in vivo observations. In addition, it was found that following an intraperitoneal injection, ND-EDA-calcein could be accumulated mostly in the liver and kidney of the mice but not in the spleen. It is interesting to note that after 5 days following intraperitoneal injection, mice can totally metabolize the elimination of ND-EDA-calcein outside of their bodies. Therefore, our findings suggested that NDs can be considered for various nanomedicine applications including drug delivery and biomarkers.
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Acknowledgements
This research was supported by the Fundamental Research Funds for the Central Universities and Hubei Provincial Department of Education (Q20183005).
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XW and YC conceptualized the study; XW contributed to methodology, investigation, resources and writing—original draft preparation; JQ assisted with the software; XW, YC and JQ carried out validation; YC and LA performed formal analysis; XW and YS curated the data; YC took part in writing—review and editing, project administration and funding acquisition; XH participated in visualization; and DC and JM were involved in supervision. All authors have read and agreed to the published version of the manuscript.
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Wu, X., Qu, J., Asibaike, L. et al. Toxicity and biodistribution of nanodiamond coupled with calcein. J Mater Sci 58, 12764–12774 (2023). https://doi.org/10.1007/s10853-023-08808-6
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DOI: https://doi.org/10.1007/s10853-023-08808-6