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Strong Signal Increase in STED Fluorescence Microscopy by Imaging Regions of Subdiffraction Extent

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Strong Signal Increase in STED Fluorescence Microscopy by Imaging Regions of Subdiffraction Extent Strong signal increase in STED fluorescence microscopy by imaging regions of subdiffraction extent Fabian Göttferta, Tino Pleinerb, Jörn Heinec, Volker Westphala, Dirk Görlichb, Steffen J. Sahla, and Stefan W. Hella,1 aDepartment of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany; bDepartment of Cellular Logistics, Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany; and cAbberior Instruments GmbH, 37077 Göttingen, Germany Contributed by Stefan W. Hell, January 11, 2017 (sent for review December 18, 2016; reviewed by Jörg Bewersdorf and Ke Xu) Photobleaching remains a limiting factor in superresolution fluo- the focal-plane intensity distribution of a beam of STED light is rescence microscopy. This is particularly true for stimulated emission typically formed to exhibit a central intensity zero (“doughnut”), depletion (STED) and reversible saturable/switchable optical fluores- switching off all fluorophores outside the vicinity of the focal cence transitions (RESOLFT) microscopy, where adjacent fluorescent center (Fig. 1 B and C). Both beams are jointly scanned through molecules are distinguished by sequentially turning them off (or on) the specimen to successively probe neighboring subdiffraction using a pattern of light formed as a doughnut or a standing wave. In sample regions where fluorophores may reside. We choose here sample regions where the pattern intensity reaches or exceeds a to define the STED beam intensity IS as the intensity at which certain threshold, the molecules are essentially off (or on), whereas the probability of deexciting a fluorophore by stimulated emis- p = I in areas where the intensity is lower, that is, around the intensity sion is stim 0.5. If the fluorophore is exposed to the intensity S, A minima, the molecules remain in the initial state. Unfortunately, the its fluorescence is reduced to 50% of its normal value (Fig. 1 ). I creation of on/off state differences on subdiffraction scales requires We can now define S as the threshold intensity that separates “ ” “ ” the maxima of the intensity pattern to exceed the threshold intensity fluorophores that are on from those that are off. In other words, if the fluorescence signal of a fluorophore is 50–100% of by a large factor that scales with the resolution. Hence, when record- < ing an image by scanning the pattern across the sample, each mole- its normal signal, we define it as on; if it is 50%, we define it as off. Clearly, this definition is somewhat arbitrary, because we cule in the sample is repeatedly exposed to the maxima, which I exacerbates bleaching. Here, we introduce MINFIELD, a strategy for could also have chosen 6 S as the threshold intensity, in which case off would have implied a signal reduction to only 1.56%. fundamentally reducing bleaching in STED/RESOLFT nanoscopy I through restricting the scanning to subdiffraction-sized regions. However, choosing S has the advantage that it directly relates to By safeguarding the molecules from the intensity of the maxima the full width at half-maximum (FWHM) of the subdiffraction- sized region of fluorescence emission created by the doughnut- and exposing them only to the lower intensities (around the shaped STED beam, which is usually taken as a resolution measure. minima) needed for the off-switching (on-switching), MINFIELD It is now important to realize that, although the fluorophores are off largely avoids detrimental transitions to higher molecular states. also for STED beam intensities that are higher than IS,suchhigher A bleaching reduction by up to 100-fold is demonstrated. Record- intensities are actually not needed for keeping the fluorophore off, SCIENCES ing nanobody-labeled nuclear pore complexes in Xenopus laevis because the on/off difference is already created at IS (Fig. 1). cells showed that MINFIELD-STED microscopy resolved details APPLIED PHYSICAL separated by <25 nm where conventional scanning failed to ac- quire sufficient signal. Significance fluorescence nanoscopy | STED microscopy | photobleaching | In stimulated emission depletion (STED) fluorescence micros- superresolution copy, the diffraction resolution barrier is overcome by applying a doughnut-shaped light beam that transiently switches fluo- rescence off, confining molecular emission to subdiffraction- luorescence nanoscopy or superresolution microscopy meth- BIOPHYSICS AND sized regions around the doughnut center. Unfortunately, the ods (1, 2) allow minimally invasive imaging with a resolution COMPUTATIONAL BIOLOGY F doughnut intensities required for high resolution exacerbate far beyond that of ordinary light microscopes. Recent advances photobleaching. Our remedy, called MINFIELD, exploits the fact open the possibility to resolve details at 20–50 nm and below (see – that fluorescence off-switching by STED does not require the examples in refs. 3 7). In stimulated emission depletion (STED) high intensities of the doughnut crest. By recording subdiffraction- nanoscopy (8, 9)—as in all other fluorescence microscopy — sized areas or volumes in the sample, molecular exposure to methods the achievable resolution and contrast are largely de- high intensities is avoided and photobleaching is reduced by termined by the total fluorescence signal, which is in turn limited by more than 100-fold. Fluorescence analysis of cellular structures photobleaching. As a matter of fact, all superresolution concepts becomes possible in unprecedented detail. Providing larger providing resolution at the 20- to 50-nm level are restricted to using signal and faster recording times, MINFIELD-STED microscopy specific fluorophores or buffers due to the signal limitation. Ap- should open a unique range of superresolution imaging ap- proaches previously developed to reduce photobleaching have plications in the life sciences. therefore led to significant advances. Specifically, in STED nano- scopy, using long (>100-ps) laser pulses (10), reducing numbers of Author contributions: F.G., D.G., and S.W.H. designed research; S.W.H. conceived the unnecessary state transition cycles (11), and allowing the relaxation MINFIELD approach; F.G. and J.H. performed research; T.P., V.W., and D.G. contributed new reagents/analytic tools; F.G. and J.H. analyzed data; and F.G., S.J.S., and S.W.H. wrote the paper. of bleaching-prone dark fluorophore states (12) have already reduced photobleaching severalfold. Reviewers: J.B., Yale School of Medicine; and K.X., University of California, Berkeley. In STED microscopy (Fig. 1), resolution is increased by confining Conflict of interest statement: S.W.H. and J.H. are a cofounder and employee of Abberior Instruments GmbH, respectively, a company commercializing superresolution microscopes. the capability of a fluorophore to emit fluorescence to a predefined Jörg Bewersdorf and S.W.H. were coauthors on a paper in 2015: Hell SW, et al. (2015) The subdiffraction-sized region. This is accomplished with the STED 2015 super-resolution microscopy roadmap. J Phys D Appl Phys 48(44):443001. This was a light, which forces excited fluorophores into their ground state review article and not an active research collaboration. through stimulated emission before fluorescence emission. Thus, Freely available online through the PNAS open access option. the presence of STED light of a given intensity switches the 1To whom correspondence should be addressed. Email: [email protected]. A fluorescence capability of the fluorophore off (Fig. 1 ). To use This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. this effect in a point-scanning microscope for superresolution, 1073/pnas.1621495114/-/DCSupplemental. www.pnas.org/cgi/doi/10.1073/pnas.1621495114 PNAS | February 28, 2017 | vol. 114 | no. 9 | 2125–2130 Downloaded by guest on September 30, 2021 AB C Fig. 1. The MINFIELD concept: Lower local deexcitation intensities in STED nanoscopy for image sizes below the diffraction limit. (A) In STED imaging with pulsed lasers, the ability of a fluorophore to emit fluorescence decreases nearly exponentially with the intensity of the beam deexciting the fluorophore by stimulated emission. We here define Is as the intensity at which the fluorescence signal is reduced by 50%. Fluorophores delivering higher signal are defined as on, whereas those with smaller signal are defined as off. (B) The STED beam is shaped to exhibit a central intensity zero in the focal region (i.e., a doughnut), so that (C) molecules can show fluorescence only if they are located in a small area in the doughnut center. This area decreases with increasing total doughnut intensity. Due to its diffraction-limited nature, the intensity distribution of the STED focal beam extends over more than half of the STED beam wavelength and exhibits strong intensity maxima, significantly contributing to bleaching. By reducing the size of the image field to an area below the diffraction limit, where the STED beam intensity is more moderate (i.e., around the doughnut minimum; compare image area indicated in B), one can reduce the irradiation intensities in the area of interest, inducing lower photobleaching and allowing the acquisition of more fluorescence signal at higher resolution. (Scale bar: 200nm.) However, intensities much greater than IS are applied in STED the MINFIELD approach roughly followed the design consid- microscopy because tightly confining the region of possible fluores- erations for red and far-red emitting dyes as reported previously cence emission inevitably necessitates
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