Abstract
Single-walled carbon nanotubes (SWNTs) can deliver imaging agents or drugs to tumours and offer significant advantages over approaches based on antibodies or other nanomaterials. In particular, the nanotubes can carry a substantial amount of cargo (100 times more than a monoclonal antibody), but can still be rapidly eliminated from the circulation by renal filtration, like a small molecule, due to their high aspect ratio. Here we show that SWNTs can target tumours in a two-step approach in which nanotubes modified with morpholino oligonucleotide sequences bind to cancer cells that have been pretargeted with antibodies modified with oligonucleotide strands complementary to those on the nanotubes. The nanotubes can carry fluorophores or radioisotopes, and are shown to selectively bind to cancer cells in vitro and in tumour-bearing xenografted mice. The binding process is also found to lead to antigen capping and internalization of the antibody–nanotube complexes. The nanotube conjugates were labelled with both alpha-particle and gamma-ray emitting isotopes, at high specific activities. Conjugates labelled with alpha-particle-generating 225Ac were found to clear rapidly, thus mitigating radioisotope toxicity, and were shown to be therapeutically effective in vivo.
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Acknowledgements
The authors acknowledge support from the National Institutes of Health (NIH P01 CA33049 to D.A.S.; NIH R01 CA55349 to D.A.S.; R21 CA128406 to M.R.M.), the Office of Science (BER), the US Department of Energy (award no. DE-SC0002456 to M.R.M.), the NIH Medical Scientist Training Program (MSTP; grant GM07739 to J.J.M., C.H.V. and F.E.E.), the MSKCC Molecular Cytology Core Facility, the MSKCC Experimental Therapeutics Center, the MSKCC Brain Tumour Center and The Tudor and Glades Funds. The authors thank D. Hnatowich for helpful discussions. The authors also thank W. Maguire, S. Alidori and E. Feinberg for assistance, Actinium Pharmaceuticals for 225Ac acquisition, and M. Bergkvist for TEM and Raman spectroscopy.
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J.J.M., C.V., D.A.S. and M.M. conceived and designed the experiments and wrote the paper. C.V. and J.J.M. conducted all the experiments. E.C. assisted with confocal microscopy experiments. F.E. assisted with solid tumour targeting experiments.
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Mulvey, J., Villa, C., McDevitt, M. et al. Self-assembly of carbon nanotubes and antibodies on tumours for targeted amplified delivery. Nature Nanotech 8, 763–771 (2013). https://doi.org/10.1038/nnano.2013.190
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DOI: https://doi.org/10.1038/nnano.2013.190
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