Abstract
Here, we introduce a novel approach to the detection of intracellular molecules by measuring direct interactions with an ultrathin probe, i.e. nanoneedle, which is mounted on an atomic force microscope (AFM). Standard AFM probes were sharpened, using a focused ion beam (FIB), to form high-aspect-ratio nanoneedles, which were then specifically functionalized and inserted into live cells. The insertion could be precisely detected using the resulted force–distance AFM curves, and no effect on cell viability was observed, even after repeated insertions. In addition, thanks to the high sensitivity of the AFM, distinct intermolecular unbinding events could be analyzed, which provided real-time information on the cytoskeleton state of the live cell. Following specific coatings and functionalization of the nanoneedles, various intracellular molecules could be detected and even inserted into live cells. The results presented here demonstrate the delivery of DNA vectors and the detection of mRNA and cytoskeletal proteins in live cells. Further advances in this technology, such as new developments in molecular functionalization options and improvements in the scale and accuracy of force measurements, will open possible new fields and applications for this diverse and powerful tool.
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Kawamura, R., Silberberg, Y.R., Nakamura, C. (2015). Specialized Nanoneedles for Intracellular Analysis. In: Vestergaard, M., Kerman, K., Hsing, IM., Tamiya, E. (eds) Nanobiosensors and Nanobioanalyses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55190-4_14
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DOI: https://doi.org/10.1007/978-4-431-55190-4_14
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