Abstract
Nanoparticle size, surface charge and material composition are known to affect the uptake of nanoparticles by cells. However, whether nanoparticle shape affects transport across various barriers inside the cell remains unclear. Here we used pair correlation microscopy to show that polymeric nanoparticles with different shapes but identical surface chemistries moved across the various cellular barriers at different rates, ultimately defining the site of drug release. We measured how micelles, vesicles, rods and worms entered the cell and whether they escaped from the endosomal system and had access to the nucleus via the nuclear pore complex. Rods and worms, but not micelles and vesicles, entered the nucleus by passive diffusion. Improving nuclear access, for example with a nuclear localization signal, resulted in more doxorubicin release inside the nucleus and correlated with greater cytotoxicity. Our results therefore demonstrate that drug delivery across the major cellular barrier, the nuclear envelope, is important for doxorubicin efficiency and can be achieved with appropriately shaped nanoparticles.
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Change history
30 September 2016
In the version of this Article originally published online, in the Methods, in the equation for G(τ), in the denominator, the superscript '2' was incorrectly placed, and in the equation for G(τ, δr), in the denominator, there should have been two sets of angled brackets. These errors have been corrected in all versions of the Article.
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Acknowledgements
E.H. is funded by a Cancer Institute NSW Early Career Fellowship (RG151879) and UNSW Vice Chancellor Research Fellowship. B.K. acknowledges the Scientific and Technological Research Council of Turkey (TUBITAK) for financial support. C.B. is funded by a Future Fellowship (FT1210096) from Australian Research Council (ARC). K.G. acknowledges funding from the ARC Centre of Excellence in Advanced Molecular Imaging (CE140100011) and National Health and Medical Research Council of Australia (1059278, 1037320). J.J.G. acknowledges funding from the ARC Centre of Excellence in Convergent Bio-Nano Science and Technology (CE140100036), the ARC Laureate Fellowship (FL150100060) program and a National Health and Medical Research Council program grant (1091261). The authors thank C. Benzing (UNSW) for discussion on cell uptake and endosomal escape. The authors thank E. Gratton (University of California, Irvine) for discussion on data analysis. The work was supported by the BioMedical Imaging Facility at UNSW.
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E.H, C.B, J.J.G and K.G designed the research. E.H and K.T performed imaging experiments. H.T.T.D, B.K and J.Y synthesized the nanoparticles. E.H and K.T. analysed data, and E.H., J.J.G and K.G. wrote the paper. All authors reviewed the manuscript.
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Hinde, E., Thammasiraphop, K., Duong, H. et al. Pair correlation microscopy reveals the role of nanoparticle shape in intracellular transport and site of drug release. Nature Nanotech 12, 81–89 (2017). https://doi.org/10.1038/nnano.2016.160
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DOI: https://doi.org/10.1038/nnano.2016.160
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