Nucleocytoplasmic shuttling: The ins and outs of quantitative imaging

Clinical and Experimental Pharmacology & Physiology
Chris Molenaar, Kate L Weeks

Abstract

Nucleocytoplasmic protein shuttling is integral to the transmission of signals between the nucleus and the cytoplasm. The nuclear/cytoplasmic distribution of proteins of interest can be determined via fluorescence microscopy, following labelling of the target protein with fluorophore-conjugated antibodies (immunofluorescence) or by tagging the target protein with an autofluorescent protein, such as green fluorescent protein (GFP). The latter enables live cell imaging, a powerful approach that precludes many of the artefacts associated with indirect immunofluorescence in fixed cells. In this review, we discuss important considerations for the design and implementation of fluorescence microscopy experiments to quantify the nuclear/cytoplasmic distribution of a protein of interest. We summarise the pros and cons of detecting endogenous proteins in fixed cells by immunofluorescence and ectopically-expressed fluorescent fusion proteins in living cells. We discuss the suitability of widefield fluorescence microscopy and of 2D, 3D and 4D imaging by confocal microscopy for different applications, and describe two different methods for quantifying the nuclear/cytoplasmic distribution of a protein of interest from the fluorescent signal....Continue Reading

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Citations

Jul 19, 2018·Journal of Molecular Biology·Diana M MitreaRichard W Kriwacki
Jul 28, 2021·Journal of Cell Science·Anna M DowbajErik Sahai

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