Complementarity of PALM and SOFI for super-resolution live-cell imaging of focal adhesions

Hendrik Deschout, Tomas Lukes, Azat Sharipov, Daniel Szlag, Lely Feletti, Wim Vandenberg, Peter Dedecker, Johan Hofkens, Marcel Leutenegger, Theo Lasser () and Aleksandra Radenovic ()
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Hendrik Deschout: Laboratory of Nanoscale Biology & Laboratoire d’Optique Biomédicale, STI - IBI, Ecole Polytechnique Fédérale de Lausanne
Tomas Lukes: Laboratory of Nanoscale Biology & Laboratoire d’Optique Biomédicale, STI - IBI, Ecole Polytechnique Fédérale de Lausanne
Azat Sharipov: Laboratory of Nanoscale Biology & Laboratoire d’Optique Biomédicale, STI - IBI, Ecole Polytechnique Fédérale de Lausanne
Daniel Szlag: Laboratory of Nanoscale Biology & Laboratoire d’Optique Biomédicale, STI - IBI, Ecole Polytechnique Fédérale de Lausanne
Lely Feletti: Laboratory of Nanoscale Biology & Laboratoire d’Optique Biomédicale, STI - IBI, Ecole Polytechnique Fédérale de Lausanne
Wim Vandenberg: University of Leuven
Peter Dedecker: University of Leuven
Johan Hofkens: University of Leuven
Marcel Leutenegger: Max-Planck-Institut für biophysikalische Chemie
Theo Lasser: Laboratory of Nanoscale Biology & Laboratoire d’Optique Biomédicale, STI - IBI, Ecole Polytechnique Fédérale de Lausanne
Aleksandra Radenovic: Laboratory of Nanoscale Biology & Laboratoire d’Optique Biomédicale, STI - IBI, Ecole Polytechnique Fédérale de Lausanne

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Live-cell imaging of focal adhesions requires a sufficiently high temporal resolution, which remains a challenge for super-resolution microscopy. Here we address this important issue by combining photoactivated localization microscopy (PALM) with super-resolution optical fluctuation imaging (SOFI). Using simulations and fixed-cell focal adhesion images, we investigate the complementarity between PALM and SOFI in terms of spatial and temporal resolution. This PALM-SOFI framework is used to image focal adhesions in living cells, while obtaining a temporal resolution below 10 s. We visualize the dynamics of focal adhesions, and reveal local mean velocities around 190 nm min−1. The complementarity of PALM and SOFI is assessed in detail with a methodology that integrates a resolution and signal-to-noise metric. This PALM and SOFI concept provides an enlarged quantitative imaging framework, allowing unprecedented functional exploration of focal adhesions through the estimation of molecular parameters such as fluorophore densities and photoactivation or photoswitching kinetics.

Date: 2016
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DOI: 10.1038/ncomms13693

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