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21 February 2017 Combining PALM and SOFI for quantitative imaging of focal adhesions in living cells
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Focal adhesions are complicated assemblies of hundreds of proteins that allow cells to sense their extracellular matrix and adhere to it. Although most focal adhesion proteins have been identified, their spatial organization in living cells remains challenging to observe. Photo-activated localization microscopy (PALM) is an interesting technique for this purpose, especially since it allows estimation of molecular parameters such as the number of fluorophores. However, focal adhesions are dynamic entities, requiring a temporal resolution below one minute, which is difficult to achieve with PALM. In order to address this problem, we merged PALM with super-resolution optical fluctuation imaging (SOFI) by applying both techniques to the same data. Since SOFI tolerates an overlap of single molecule images, it can improve the temporal resolution compared to PALM. Moreover, an adaptation called balanced SOFI (bSOFI) allows estimation of molecular parameters, such as the fluorophore density. We therefore performed simulations in order to assess PALM and SOFI for quantitative imaging of dynamic structures. We demonstrated the potential of our PALM–SOFI concept as a quantitative imaging framework by investigating moving focal adhesions in living cells.
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Hendrik Deschout, Tomas Lukes, Azat Sharipov, Lely Feletti, Theo Lasser, and Aleksandra Radenovic "Combining PALM and SOFI for quantitative imaging of focal adhesions in living cells", Proc. SPIE 10071, Single Molecule Spectroscopy and Superresolution Imaging X, 100710E (21 February 2017);

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