Abstract
This protocol describes a sensitive approach to tracking the motion of membrane molecules such as lipids and proteins with molecular resolution in live cells. This technique makes use of fluorescent semiconductor nanocrystals, quantum dots (QDs), as a probe to detect membrane molecules of interest. The photostability and brightness of QDs allow them to be tracked at a single particle level for longer periods than previous fluorophores, such as fluorescent proteins and organic dyes. QDs are bound to the extracellular part of the object to be followed, and their movements can be recorded with a fluorescence microscope equipped with a spectral lamp and a sensitive cooled charge-coupled device camera. The experimental procedure described for neurons below takes about 45 min. This technique is applicable to various cultured cells.
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Acknowledgements
We thank S. Bonneau and M.-V. Ehrensperger (Ecole Normale Supérieure, Paris, France) for writing the custom-made software for data analysis and T. Inoue and K. Mikoshiba (University of Tokyo, Japan) for the custom-made software TI Workbench and for valuable discussions on data analysis. We also thank Quantum Dot Corporation for providing the composition of the QD binding buffer. This work was supported by grants from INSERM, the CNRS, the Ministère de la Recherche and the FRM to S.L., M.D. and A.T. and Toyobo Biotechnology Foundation, Hayashi Memorial Foundation for Female Natural Scientists and the Japan Society for the Promotion of Science to H.B.
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Supplementary information
Supplementary Video 1
Example of QD recording. (MOV 1574 kb)
Supplementary Video 2
Example of simultaneous QDs and calcium indicator imaging. (MOV 2325 kb)
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Bannai, H., Lévi, S., Schweizer, C. et al. Imaging the lateral diffusion of membrane molecules with quantum dots. Nat Protoc 1, 2628–2634 (2006). https://doi.org/10.1038/nprot.2006.429
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DOI: https://doi.org/10.1038/nprot.2006.429
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