Abstract
Carbon nanotubes have shown promise as contrast agents for photoacoustic and photothermal imaging of tumours and infections because they offer high resolution and allow deep tissue imaging. However, in vivo applications have been limited by the relatively low absorption displayed by nanotubes at near-infrared wavelengths and concerns over toxicity. Here, we show that gold-plated carbon nanotubes—termed golden carbon nanotubes—can be used as photoacoustic and photothermal contrast agents with enhanced near-infrared contrast (∼102-fold) for targeting lymphatic vessels in mice using extremely low laser fluence levels of a few mJ cm−2. Antibody-conjugated golden carbon nanotubes were used to map the lymphatic endothelial receptor, and preliminary in vitro viability tests show golden carbon nanotubes have minimal toxicity. This new nanomaterial could be an effective alternative to existing nanoparticles and fluorescent labels for non-invasive targeted imaging of molecular structures in vivo.
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Acknowledgements
This work was supported in part by National Institute of Health grant nos R01EB000873, R01EB009230, R01CA131164, R21EB005123 and R21CA139373, National Science Foundation grant nos DBI-0852737 and CMMI-0709121 and the Arkansas Biosciences Institute. The authors thank R. Goforth and R. Deaton for their helpful discussions regarding this study. The authors also thank D. Lapotko for his assistance in setting up the PT microscope, N. Khlebtsov for providing gold nanorods and gold nanoshells, H.-J. Kim for her assistance in image processing and T.F. Garrison, J.-H. Kim, N. Kotagiri and J.S. Lee for their assistance with AFM and TEM imaging and sample preparation.
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J.-W.K. and V.P.Z. conceived and designed the experiments. All authors performed the experiments and discussed the results. J.-W.K., E.I.G and V.P.Z. co-wrote the paper.
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Kim, JW., Galanzha, E., Shashkov, E. et al. Golden carbon nanotubes as multimodal photoacoustic and photothermal high-contrast molecular agents. Nature Nanotech 4, 688–694 (2009). https://doi.org/10.1038/nnano.2009.231
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DOI: https://doi.org/10.1038/nnano.2009.231
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