Abstract
There is considerable interest in using nanoparticles as labels or to deliver drugs and other bioactive compounds to cells in vitro and in vivo. Fluorescent imaging, commonly used to study internalization and subcellular localization of nanoparticles, does not allow unequivocal distinction between cell surface-bound and internalized particles, as there is no methodology to turn particles ‘off’. We have developed a simple technique to rapidly remove silver nanoparticles outside living cells, leaving only the internalized pool for imaging or quantification. The silver nanoparticle (AgNP) etching is based on the sensitivity of Ag to a hexacyanoferrate–thiosulphate redox-based destain solution. In demonstration of the technique we present a class of multicoloured plasmonic nanoprobes comprising dye-labelled AgNPs that are exceptionally bright and photostable, carry peptides as model targeting ligands, can be etched rapidly and with minimal toxicity in mice, and that show tumour uptake in vivo.
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References
Tassa, C., Shaw, S. Y. & Weissleder, R. Dextran-coated iron oxide nanoparticles: A versatile platform for targeted molecular imaging, molecular diagnostics, and therapy. Acc. Chem. Res. 44, 842–852 (2011).
Ruoslahti, E. Peptides as targeting elements and tissue penetration devices for nanoparticles. Adv. Mater. 24, 3747–3756 (2012).
Chithrani, B. D. & Chan, W. C. Elucidating the mechanism of cellular uptake and removal of protein-coated gold nanoparticles of different sizes and shapes. Nano Lett. 7, 1542–1550 (2007).
Goulet, P. J., Bourret, G. R. & Lennox, R. B. Facile phase transfer of large, water-soluble metal nanoparticles to nonpolar solvents. Langmuir 28, 2909–2913 (2012).
Moller, J. et al. Dissolution of iron oxide nanoparticles inside polymer nanocapsules. Phys. Chem. Chem. Phys. 13, 20354–20360 (2011).
Cho, E. C., Xie, J., Wurm, P. A. & Xia, Y. Understanding the role of surface charges in cellular adsorption versus internalization by selectively removing gold nanoparticles on the cell surface with a I2/KI etchant. Nano Lett. 9, 1080–1084 (2009).
Sun, Y. & Xia, Y. Gold and silver nanoparticles: A class of chromophores with colors tunable in the range from 400 to 750 nm. Analyst 128, 686–691 (2003).
Lakowicz, J. R. Radiative decay engineering 5: Metal-enhanced fluorescence and plasmon emission. Anal. Biochem. 337, 171–194 (2005).
Zhang, F. et al. Fabrication of Ag@SiO(2)@Y(2)O(3):Er nanostructures for bioimaging: tuning of the upconversion fluorescence with silver nanoparticles. J. Am. Chem. Soc. 132, 2850–2851 (2010).
Mulvihill, M. J., Ling, X. Y., Henzie, J. & Yang, P. Anisotropic etching of silver nanoparticles for plasmonic structures capable of single-particle SERS. J. Am. Chem. Soc. 132, 268–274 (2010).
Braun, G. B. et al. Generalized approach to SERS-active nanomaterials via controlled nanoparticle linking, polymer encapsulation, and small-molecule infusion. J. Phys. Chem. C 113, 13622–13629 (2009).
Bharadwaj, P. & Novotny, L. Spectral dependence of single molecule fluorescence enhancement. Opt. Express 15, 14266–14274 (2007).
Kim, J. H., Estabrook, R. A., Braun, G., Lee, B. R. & Reich, N. O. Specific and sensitive detection of nucleic acids and RNases using gold nanoparticle–RNA–fluorescent dye conjugates. Chem. Commun. 4342–4344 (2007).
Teesalu, T., Sugahara, K. N., Kotamraju, V. R. & Ruoslahti, E. C-end rule peptides mediate neuropilin-1-dependent cell, vascular, and tissue penetration. Proc. Natl Acad. Sci. USA 106, 16157–16162 (2009).
Meywald, T., Scherthan, H. & Nagl, W. Increased specificity of colloidal silver staining by means of chemical attenuation. Hereditas 124, 63–70 (1996).
Scheler, C. et al. Peptide mass fingerprint sequence coverage from differently stained proteins on two-dimensional electrophoresis patterns by matrix assisted laser desorption/ionization-mass spectrometry (MALDI-MS). Electrophoresis 19, 918–927 (1998).
Koley, D. & Bard, A. J. Triton X-100 concentration effects on membrane permeability of a single HeLa cell by scanning electrochemical microscopy (SECM). Proc. Natl Acad. Sci. USA 107, 16783–16787 (2010).
Cardozo, R. H., Edelman, I. S. & Moore, F. D. Sodium thiosulfate dilution as a measure of the volume of fluid outside of body cells. Surgical Forum 606–611 (1951).
Liu, N., Hentschel, M., Weiss, T., Alivisatos, A. P. & Giessen, H. Three-dimensional plasmon rulers. Science 332, 1407–1410 (2011).
Malicka, J., Gryczynski, I., Gryczynski, Z. & Lakowicz, J. R. Effects of fluorophore-to-silver distance on the emission of cyanine-dye-labeled oligonucleotides. Anal. Biochem. 315, 57–66 (2003).
Burdinski, D. & Blees, M. H. Thiosulfate-and thiosulfonate-based etchants for the patterning of gold using microcontact printing. Chem. Mater. 19, 3933–3944 (2007).
Van Duijn, M. M. Ascorbate stimulates ferricyanide reduction in HL-60 cells through a mechanism distinct from the NADH-dependent plasma membrane reductase. J. Biol. Chem. 273, 13415–13420 (1998).
De Jong, W. H. et al. Systemic and immunotoxicity of silver nanoparticles in an intravenous 28 days repeated dose toxicity study in rats. Biomaterials 34, 8333–8343 (2013).
Lakowicz, J. R. et al. Radiative decay engineering: 2. Effects of silver island films on fluorescence intensity, lifetimes, and resonance energy transfer. Anal. Biochem. 301, 261–277 (2002).
Sugahara, K. N. et al. Tissue-penetrating delivery of compounds and nanoparticles into tumors. Cancer Cell 16, 510–520 (2009).
Teesalu, T., Sugahara, K. N. & Ruoslahti, E. Mapping of vascular ZIP codes by phage display. Methods Enzymol. 503, 35–56 (2012).
McFarland, A. D. & Van Duyne, R. P. Single silver nanoparticles as real-time optical sensors with zeptomole sensitivity. Nano Lett. 3, 1057–1062 (2003).
Roth, L. et al. Transtumoral targeting enabled by a novel neuropilin-binding peptide. Oncogene 31, 3754–3763 (2012).
Vaira, V. et al. Preclinical model of organotypic culture for pharmacodynamic profiling of human tumors. Proc. Natl Acad. Sci. USA 107, 8352–8356 (2010).
Chen, R. et al. Application of a proapoptotic peptide to intratumorally spreading cancer therapy. Cancer Res. 73, 1352–1361 (2013).
Ruoslahti, E., Bhatia, S. N. & Sailor, M. J. Targeting of drugs and nanoparticles to tumors. J. Cell Biol. 188, 759–768 (2010).
Zweens, J., Frankena, H., Rispens, P. & Zijlstra, W. G. Determination of extracellular fluid volume in the dog with ferrocyanide. Pflugers Arch. 357, 275–290 (1975).
Mendel, B. The action of ferricyanide on tumour cells. Am. J. Cancer 30, 549–552 (1937).
Gillies, R. J., Schornack, P. A., Secomb, T. W. & Raghunand, N. Causes and effects of heterogeneous perfusion in tumors. Neoplasia 1, 197–207 (1999).
Lin, E. Y. et al. Progression to malignancy in the polyoma middle T oncoprotein mouse breast cancer model provides a reliable model for human diseases. Am. J. Pathol. 163, 2113–2126 (2003).
Agemy, L. et al. Targeted nanoparticle enhanced proapoptotic peptide as potential therapy for glioblastoma. Proc. Natl Acad. Sci. USA 108, 17450–17455 (2011).
Sugahara, K. N. et al. Coadministration of a tumor-penetrating peptide enhances the efficacy of cancer drugs. Science 328, 1031–1035 (2010).
Farokhzad, O. C. et al. Targeted nanoparticle-aptamer bioconjugates for cancer chemotherapy in vivo. Proc. Natl Acad. Sci. USA 103, 6315–6320 (2006).
Chuntonov, L., Bar-Sadan, M., Houben, L. & Haran, G. Correlating electron tomography and plasmon spectroscopy of single noble metal core-shell nanoparticles. Nano Lett. 12, 145–150 (2012).
Gu, H., Yang, Z., Gao, J., Chang, C. K. & Xu, B. Heterodimers of nanoparticles: Formation at a liquid-liquid interface and particle-specific surface modification by functional molecules. J. Am. Chem. Soc. 127, 34–35 (2005).
Pallaoro, A., Braun, G. B. & Moskovits, M. Quantitative ratiometric discrimination between noncancerous and cancerous prostate cells based on neuropilin-1 overexpression. Proc. Natl Acad. Sci. USA 108, 16559–16564 (2011).
Uozumi, J., Ishizawa, M., Iwamoto, Y. & Baba, T. Sodium thiosulfate inhibits cis-diamminedichloroplatinum (II) activity. Cancer Chemother. Pharmacol. 13, 82–85 (1984).
Koyfman, A. Y. et al. Controlled spacing of cationic gold nanoparticles by nanocrown RNA. J. Am. Chem. Soc. 127, 11886–11887 (2005).
Koyfman, A. Y., Braun, G. B. & Reich, N. O. Cell-targeted self-assembled DNA nanostructures. J. Am. Chem. Soc. 131, 14237–14239 (2009).
Idili, A., Plaxco, K. W., Vallee-Belisle, A. & Ricci, F. Thermodynamic basis for engineering high-affinity, high-specificity binding-induced DNA clamp nanoswitches. ACS Nano 7, 10863–10869 (2013).
Acknowledgements
This work was supported by US DoD awards W81XWH-10-1-0199 and W81XWH-09-0698; R01 CA152327, R01 CA167174, and CA 030199 (Cancer Center Support grant) from the NCI; and by the Defense Advanced Research Projects Agency (DARPA) under Cooperative Agreement HR0011-13-2-0017. The findings and views expressed are those of the authors and do not reflect the official policy or position of the Department of Defense or the US Government. Approved for Public Release, Distribution Unlimited. G.B.B. was supported by the Cancer Center of Santa Barbara and by an NIH training grant (T32 CA121949), and A-M.A.W., and T.T. by the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Starting Grant Agreement No. 291910. The authors thank L. Agemy, R. Chen and M. Moskovits for helpful discussions, A. K-Clark for assistance and technical support with ICP-MS, F. Zhang for guidance in Ag synthesis, F. Vitti for helpful discussions on silver amplification, J. Wang for flow cytometry assistance, the NRI-MCDB Microscopy Facility at UCSB, and Histology and Cellular Imaging cores at the Sanford-Burnham Medical Research Institute.
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G.B.B., T.T. and E.R. initiated the research and G.B.B., H-B.P., T.F., A.P., T.H.dM., A-M.A.W., Z-G.S. and A.P.M. designed and performed experiments. K.S., T.T., N.O.R. and E.R. supervised the research. V.R.K. synthesized peptides. G.B.B. and E.R. wrote the manuscript. All authors contributed to analysing data and revising the manuscript.
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The authors declare that K.N.S., V.R.K., T.T. and E.R. have ownership interest (including patents) in CendR Therapeutics. E.R. is also founder, chairman of the board of CendR Therapeutics. No potential conflicts of interest were disclosed by the other authors.
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Braun, G., Friman, T., Pang, HB. et al. Etchable plasmonic nanoparticle probes to image and quantify cellular internalization. Nature Mater 13, 904–911 (2014). https://doi.org/10.1038/nmat3982
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DOI: https://doi.org/10.1038/nmat3982