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We systematically evaluated the performance and reliability of several widely used, commercially available actin-filament probes in a highly motile breast adenocarcinoma cell line to optimize the visualization of F-actin-rich dynamic lamellipodia. We evaluated four Phalloidin-fluorophores, two anti-actin antibodies, and three live-cell actin probes in five fixation conditions across three imaging platforms as a basis for the design of optimized protocols. Of the fluorescent phalloidin-dye conjugates tested, Alexa Fluor-488 Phalloidin ranked best in overall labeling of the actin cytoskeleton and maintenance of the fluorescence signal over time. Use of actin monoclonal antibodies revealed significant limitations under a variety of fixation-permeabilization conditions. Evaluation of commonly used live-cell probes provides evidence for actin filament bias, with TagRFP-Lifeact excluded from lamellipodia, but not mEGFP-Lifeact or F-tractin-EGFP.

Optimizing leading edge F-actin labeling using multiple actin probes, fixation methods and imaging modalities