Nanoscopy in a Living Multicellular Organism Expressing GFP

Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
Biophysical Journal (Impact Factor: 3.97). 06/2011; 100(12):L63-5. DOI: 10.1016/j.bpj.2011.05.020
Source: PubMed


We report superresolution fluorescence microscopy in an intact living organism, namely Caenorhabditis elegans nematodes expressing green fluorescent protein (GFP)-fusion proteins. We also superresolve, by stimulated emission depletion (STED) microscopy, living cultured cells, demonstrating that STED microscopy with GFP can be widely applied. STED with GFP can be performed with both pulsed and continuous-wave lasers spanning a wide wavelength range from at least 556-592 nm. Acquiring subdiffraction resolution images within seconds enables the recording of movies revealing structural dynamics. These results demonstrate that numerous microscopy studies of live samples employing GFP as the marker can be performed at subdiffraction resolution.

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    • "Further, the use of a continuouswave laser in conjunction with a gated fluorescence detection scheme has enabled a reduction in the STED laser power and a simplification of the setups (Vicidomini et al. 2011; Honigmann et al. 2012a; Mueller et al. 2012). As a consequence , STED microscopy is nowadays considered a straightforward technique for the study of the living cell using genetically encoded markers such as fluorescent proteins (Willig et al. 2006a; Hein et al. 2008; Nagerl et al. 2008; Eggeling et al. 2009; Li et al. 2009; Moneron and Hell 2009; Morozova et al. 2010; Rankin et al. 2011; Tonnesen et al. 2011; Urban et al. 2011), tagging proteins such as SNAP-, HALO-, or CLIP-tags (Schr€ oder et al. 2008; Eggeling et al. 2009; Hein et al. 2010; Pellett et al. 2011; Lukinavicius et al. 2012), or fluorogen-activating tags (Fitzpatrick et al. 2009) (which both covalently bind functionalized and membrane-permeable organic dyes), even using commercial instrumentation (Schr€ oder et al. 2008; Fitzpatrick et al. 2009; Morozova et al. 2010; Friedemann et al. 2011). Furthermore, the quite high laser intensities of 1– 10 MW/cm 2 can be circumvented when switching from STED to RESOLFT nanoscopy, which employs laser intensities in the range of 1–5 kW/cm 2 only (Hofmann et al. 2005; Brakemann et al. 2011; Grotjohann et al. 2011; Testa et al. 2012). "
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