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What is Super-Resolution Microscopy & Nanoscopy?

It is less than 20 years since super-resolution microscopy and nanoscopy arrived on the light microscopy scene, but it already plays an important role, particularly in life sciences – without superseding conventional confocal microscopy. The term super-resolution refers to methods that surpass the so-called diffraction limit. Applications are wide ranging – from dynamic vesicle movements to fluorescence images of sub-cellular structures, allowing researchers to see details in unprecedented detail.

HyVolution is a super-resolution method that exploits the sub-diffraction lateral resolution capabilities of confocal microscopy at smaller pinhole sizes. With HyVolution on a TCS SP8 confocal microscope you can image multiple fluorophores simultaneously – without the need for sequential scanning. You can capture cellular details and observe dynamics with resolution down to 140 nm.

As a truly infinitely super-resolving technology, STED nanoscopy offers resolution down to 30 nanometers. STED provides instant super-resolved imaging with multiple channels and approaching isotropic super-resolution in three dimensions. Underlining the impact of super-resolution microscopy, the 2014 Nobel Prize for Chemistry was awarded jointly to Eric Betzig, Stefan W. Hell and William E. Moerner "for the development of super-resolved fluorescence microscopy".

This Science Lab topic provides tutorials on super-resolution microscopy and nanoscopy, articles with application examples, webinars, and abstracts of selected open access publications.

  • Axial Tubule Junctions Control Rapid Calcium Signaling in Atria

    The canonical atrial myocyte (AM) is characterized by sparse transverse tubule (TT) invaginations and slow intracellular Ca2+ propagation but exhibits rapid contractile activation that is susceptible to loss of function during hypertrophic remodeling. Here, we have identified a membrane structure and Ca2+-signaling complex that may enhance the speed of atrial contraction independently of phospholamban regulation. This axial couplon was observed in human and mouse atria and is composed of voluminous axial tubules (ATs) with extensive junctions to the sarcoplasmic reticulum (SR) that include ryanodine receptor 2 (RyR2) clusters. In mouse AM, AT structures triggered Ca2+ release from the SR approximately 2 times faster at the AM center than at the surface.
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  • The Molecular Architecture of Hemidesmosomes as Revealed by Super-Resolution Microscopy

    Hemidesmosomes have been extensively studied by immunofluorescence microscopy, but due to its limited resolution, their precise organization remained poorly understood. We studied hemidesmosome organization in cultured keratinocytes by 2- and 3-color super-resolution microscopy. We observed that in the cell periphery, nascent hemidesmosomes are associated with individual keratin filaments and that β4 is distributed along rather than under keratin filaments. By applying innovative methods to quantify molecular distances, we demonstrate that the hemidesmosomal plaque protein plectin interacts simultaneously and asymmetrically with β4 and keratin.
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  • Chloroplast-Mediated Regulation of CO2-Concentrating Mechanism by Ca2+-Binding Protein CAS in the Green Alga Chlamydomonas Reinhardtii

    Application example of HvYolution Super-Resolution - Aquatic photosynthetic organisms, including the green alga Chlamydomonas reinhardtii, induce a CO2-concentrating mechanism (CCM) to maintain photosynthetic activity in CO2-limiting conditions by sensing environmental CO2 and light availability. In this study, the introduction of an intact CAS gene into H82 cells restored photosynthetic affinity for inorganic carbon, and RNA-seq analyses revealed that CAS could function in maintaining the expression levels of nuclear-encoded CO2-limiting–inducible genes, including the HCO3– transporters high-light activated 3 (HLA3) and low-CO2–inducible gene A (LCIA).
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  • Actin-Dependent Vacuolar Occupancy of the Cell Determines Auxin-Induced Growth Repression

    The cytoskeleton is an early attribute of cellular life, and its main components are composed of conserved proteins. The actin cytoskeleton has a direct impact on the control of cell size in animal cells, but its mechanistic contribution to cellular growth in plants remains largely elusive. Here, we reveal a role of actin in regulating cell size in plants. The actin cytoskeleton shows proximity to vacuoles, and the phytohormone auxin not only controls the organization of actin filaments but also impacts vacuolar morphogenesis in an actin-dependent manner.
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  • The Bif-1-Dynamin 2 Membrane Fission Machinery Regulates Atg9-Containing Vesicle Generation at the Rab11-Positive Reservoirs

    Application example of HyVolution Super-Resolution - Atg9 is a multispanning transmembrane protein that is required for autophagosome formation. During autophagy, vesicles containing Atg9 are generated through an unknown mechanism and delivered to the autophagosome formation sites. We have previously reported that Atg9-containing membranes undergo continuous tubulation and fission during nutrient starvation in a manner dependent on the curvature-inducing protein Bif-1/Sh3glb1. Here, we identify Dynamin 2 (DNM2) as a Bif-1-interacting protein that mediates the fission of Atg9-containing membranes during autophagy.
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  • Quantitative Analysis of PPT1 Interactome in Human Neuroblastoma Cells

    Application example of HyVolution Super-Resolution - Mutations in the CLN1 gene that encodes Palmitoyl protein thioesterase 1 (PPT1) or CLN1, cause Infantile NCL (INCL, MIM#256730). PPT1 removes long fatty acid chains such as palmitate from modified cysteine residues of proteins. The data shown here result from isolated protein complexes from PPT1-expressing SH-SY5Y stable cells that were subjected to single step affinity purification coupled to mass spectrometry (AP-MS). Prior to the MS analysis, we utilised a modified filter-aided sample preparation (FASP) protocol. Based on label free quantitative analysis of the data by SAINT, 23 PPT1 interacting partners (IP) were identified.
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  • Super-Resolution Optical Microscopy of Lipid Plasma Membrane Dynamics

    Plasma membrane dynamics are an important ruler of cellular activity, particularly through the interaction and diffusion dynamics of membrane-embedded proteins and lipids. FCS (fluorescence correlation spectroscopy) on an optical (confocal) microscope is a popular tool for investigating such dynamics. Unfortunately, its full applicability is constrained by the limited spatial resolution of a conventional optical microscope. The present chapter depicts the combination of optical super-resolution STED (stimulated emission depletion) microscopy with FCS , and why it is an important tool for investigating molecular membrane dynamics in living cells. Compared with conventional FCS , the STED- FCS approach demonstrates an improved possibility to distinguish free from anomalous molecular diffusion, and thus to give new insights into lipid–protein interactions and the traditional lipid ‘raft’ theory.
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  • Methods to Calibrate and Scale Axial Distances in Confocal Microscopy as a Function of Refractive Index

    Application example of HyVolution Super-Resolution - Accurate distance measurement in 3D confocal microscopy is important for quantitative analysis, volume visualization and image restoration. However, axial distances can be distorted by both the point spread function (PSF) and by a refractive-index mismatch between the sample and immersion liquid, which are difficult to separate. Additionally, accurate calibration of the axial distances in confocal microscopy remains cumbersome, although several high-end methods exist. In this paper we present two methods to calibrate axial distances in 3D confocal microscopy that are both accurate and easily implemented.
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  • Evaluation of Zebrafish as a Model to Study the Pathogenesis of the Opportunistic Pathogen Cronobacter Turicensis

    Application example of HyVolution Super-Resolution - Bacteria belonging to the genus Cronobacter spp. have been recognized as causative agents of life-threatening systemic infections, primarily in premature, low-birth weight and/or immune-compromised neonates. Knowledge remains scarce regarding the underlying molecular mechanisms of disease development. In this study, we evaluated the use of a zebrafish model to study the pathogenesis of Cronobacter turicensis LMG 23827T, a clinical isolate responsible for two fatal sepsis cases in neonates.
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  • Discovery of Novel Peptides Targeting Pro-Atherogenic Endothelium in Disturbed Flow Regions -Targeted siRNA Delivery to Pro-Atherogenic Endothelium in vivo

    Application example of HyVolution Super-Resolution - Atherosclerosis occurs preferentially in arterial regions exposed to disturbed blood flow. Targeting these pro-atherogenic regions is a potential anti-atherogenic therapeutic approach, but it has been extremely challenging. Here, using in vivo phage display approach and the partial carotid ligation model of flow-induced atherosclerosis in mouse, we identified novel peptides that specifically bind to endothelial cells (ECs) exposed to disturbed flow condition in pro-atherogenic regions.
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  • Webinar: STED Nanoscopy in Combination with Optical Clearing Reveals Localization of Slit Diaphragm Proteins in the Kidney

    In this webinar, we show that optical clearing drastically increases the signal-to-noise ratio and staining quality, thus enabling STED nanoscopy of the subtlest elements of the kidney. In this way we show that optical clearing is not only a sample preparation technique to consider when imaging large mm-scale samples, but could also be fruitful when imaging at the nanoscale. Furthermore, the increased transparency of the optically cleared sample enables volumetric 3D STED imaging at sub-diffraction-limited resolution.
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  • Practical Guide for Excellent GSDIM Super-Resolution Images

    Do you know that most protists and bacteria lack in one feature that each of our body cell has? Our cells are touch and communicate with one another. They send and receive a variety of signals that coordinate their behavior to act together as a functional multicellular organism. Exploring the way of cellular communication and the ways how the cell surface interacts to organize tissues and body structures is of great interest. Kees Jalink and his team of scientists at the Netherlands Cancer Institute (NKI) in Amsterdam obtained new scientific insights into the molecular architecture of hemidesmosomes, cytoskeletal components, cell surface receptors and vesicular proteins with the help of Ground-State-Depletion (GSD)/ dSTORM microscopy. In this interview, Kees Jalink comments on their developments in imaging chambers, buffer conditions and image analysis to get the perfect super resolution image.
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  • Initiation of Lamellipodia and Ruffles Involves Cooperation Between mDia1 and the Arp2/3 Complex

    Protrusion of lamellipodia and ruffles requires polymerization of branched actin filaments by the Arp2/3 complex. Although regulation of Arp2/3 complex activity has been extensively investigated, the mechanism of initiation of lamellipodia and ruffles remains poorly understood. Here, we show that mDia1 acts in concert with the Arp2/3 complex to promote initiation of lamellipodia and ruffles.
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  • Visualizing Tropoelastin in a Long-Term Human Elastic Fibre Cell Culture Model

    Elastin is an essential protein found in a variety of tissues where resilience and flexibility are needed, such as the skin and the heart. When aiming to engineer suitable implants, elastic fibres are needed to allow adequate tissue renewal. However, the visualization of human elastogenesis remains in the dark. To date, the visualization of human tropoelastin (TE) production in a human cell context and its fibre assembly under live cell conditions has not been achieved. Here, we present a long-term cell culture model of human dermal fibroblasts expressing fluorescence-labelled human TE. We employed a lentiviral system to stably overexpress Citrine-labelled TE to build a fluorescent fibre network. Using immunofluorescence, we confirmed the functionality of the Citrine-tagged TE. Furthermore, we visualized the fibre assembly over the course of several days using confocal microscopy. Applying super resolution microscopy, we were able to investigate the inner structure of the elastin–fibrillin-1 fibre network.
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  • P53- and Mevalonate Pathway–Driven Malignancies Require Arf6 for Metastasis and Drug Resistance

    Application example of HvYolution Super-Resolution - Drug resistance, metastasis, and a mesenchymal transcriptional program are central features of aggressive breast tumors. The GTPase Arf6, often overexpressed in tumors, is critical to promote epithelial–mesenchymal transition and invasiveness. The metabolic mevalonate pathway (MVP) is associated with tumor invasiveness and known to prenylate proteins, but which prenylated proteins are critical for MVP-driven cancers is unknown. We show here that MVP requires the Arf6-dependent mesenchymal program.
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  • Botulinum Neurotoxin Type-A Enters a Non-Recycling Pool of Synaptic Vesicles

    Neuronal communication relies on synaptic vesicles undergoing regulated exocytosis and recycling for multiple rounds of fusion. Whether all synaptic vesicles have identical protein content has been challenged, suggesting that their recycling ability may differ greatly. Botulinum neurotoxin type-A (BoNT/A) is a highly potent neurotoxin that is internalized in synaptic vesicles at motor nerve terminals and induces flaccid paralysis. Recently, BoNT/A was also shown to undergo retrograde transport, suggesting it might enter a specific pool of synaptic vesicles with a retrograde trafficking fate. Using high-resolution microscopy techniques including electron microscopy and single molecule imaging, we found that the BoNT/A binding domain is internalized within a subset of vesicles that only partially co-localize with cholera toxin B-subunit and have markedly reduced VAMP2 immunoreactivity.
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  • Abstracts of the 6th European Super-Resolution User-Club Meeting

    The 6th European Super-Resolution User Club Meeting was held in collaboration with Dr. Timo Zimmermann, CRG, and Dr. Pablo Loza-Alvarez, ICFO, Barcelona. According to the founding principle of the club of keeping close to science, both imaging facilities at the CRG and the ICFO opened their doors to the User Club members, allowing them to explore exciting super-resolution and and nanoscopy applications. The meeting agenda covered highly relevant talks around this year’s central theme “Core Facilities and Super-Resolution Microscopy”, as well as plenty of opportunities to network amongst super-resolution users from different European countries. Here we present the abstracts of the talks held during the meeting.
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  • Measuring the 3D STED-PSF with a new Type of Fluorescent Beads

    A new type of fluorescent bead is presented by GATTAquant. These beads, called GATTA-Beads, are characterized by a small diameter (23 nm), high intensity and size uniformity. In combination with state-of the-art STED microscopes such as the Leica TCS SP8 STED 3X and high-end image restoration methods available in the Huygens Software, it is shown that these new beads can be used for accurate STED PSF characterization in 3D. Furthermore, it is shown that the measured 3D STED-PSF can be used to improve image restoration quality in combination with STED deconvolution methods available in the Huygens Software.
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  • Mirror-Enhanced Super-Resolution Microscopy

    Axial excitation confinement beyond the diffraction limit is crucial to the development of next-generation, super-resolution microscopy. STimulated Emission Depletion (STED) nanoscopy offers lateral super-resolution using a donut-beam depletion, but its axial resolution is still over 500 nm. Total internal reflection fluorescence microscopy is widely used for single-molecule localization, but its ability to detect molecules is limited to within the evanescent field of ~100 nm from the cell attachment surface. We find here that the axial thickness of the point spread function (PSF) during confocal excitation can be easily improved to 110 nm by replacing the microscopy slide with a mirror. The interference of the local electromagnetic field confined the confocal PSF to a 110-nm spot axially, which enables axial super-resolution with all laser-scanning microscopes.
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  • The Actin Cytoskeleton Modulates the Activation of iNKT Cells by Segregating CD1d Nanoclusters on Antigen-Presenting Cells

    The ability of invariant natural killer T (iNKT) cells to recognize endogenous antigens represents a distinct immune recognition strategy, which underscores the constitutive memory phenotype of iNKT cells and their activation during inflammatory conditions. By using superresolution microscopy, we show that CD1d molecules form nanoclusters at the cell surface of APCs, and their size and density are constrained by the actin cytoskeleton.
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  • Translation Microscopy (TRAM) for Super-Resolution Imaging

    Super-resolution microscopy is transforming our understanding of biology but accessibility is limited by its technical complexity, high costs and the requirement for bespoke sample preparation. We present a novel, simple and multi-color super-resolution microscopy technique, called translation microscopy (TRAM), in which a super-resolution image is restored from multiple diffraction-limited resolution observations using a conventional microscope whilst translating the sample in the image plane.
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  • STED-FLCS: An Advanced Tool to Reveal Spatiotemporal Heterogeneity of Molecular Membrane Dynamics

    Heterogeneous diffusion dynamics of molecules play an important role in many cellular signaling events, such as of lipids in plasma membrane bioactivity. However, these dynamics can often only be visualized by single-molecule and super-resolution optical microscopy techniques. Using fluorescence lifetime correlation spectroscopy (FLCS, an extension of fluorescence correlation spectroscopy, FCS ) on a super-resolution stimulated emission depletion (STED) microscope, we here extend previous observations of nanoscale lipid dynamics in the plasma membrane of living mammalian cells.
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  • Two-Photon Excitation STED Microscopy with Time-Gated Detection

    We report on a novel two-photon excitation stimulated emission depletion (2PE-STED) microscope based on time-gated detection. The time-gated detection allows for the effective silencing of the fluorophores using moderate stimulated emission beam intensity. This opens the possibility of implementing an efficient 2PE-STED microscope with a stimulated emission beam running in a continuous-wave.
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  • TFG Promotes Organization of Transitional ER and Efficient Collagen Secretion

    Collagen is the most abundant protein in the animal kingdom. It is of fundamental importance during development for cell differentiation and tissue morphogenesis as well as in pathological processes such as fibrosis and cancer cell migration. However, our understanding of the mechanisms of procollagen secretion remains limited. Here, we show that TFG organizes transitional ER (tER) and ER exit sites (ERESs) into larger structures. Depletion of TFG results in dispersion of tER elements that remain associated with individual ER-Golgi intermediate compartments (ERGICs) as largely functional ERESs. We show that TFG is not required for the transport and packaging of small soluble cargoes but is necessary for the export of procollagen from the ER. Our work therefore suggests a key relationship between the structure and function of ERESs and a central role for TFG in optimizing COPII assembly for procollagen export.
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  • Quantifying the Resolution of a Leica SR GSD 3D Localization Microscopy System with 2D and 3D Nanorulers

    DNA origami based nanorulers produced by GATTAquant are common standards to test the achievable spatial resolution of super-resolution microscopes. Recently the nanorulers were used to test the performance of the Leica SR GSD 3D microscope.
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  • Super-Resolution Mapping of Neuronal Circuitry With an Index-Optimized Clearing Agent

    Super-resolution imaging deep inside tissues has been challenging, as it is extremely sensitive to light scattering and spherical aberrations. Here, we report an optimized optical clearing agent for high-resolution fluorescence imaging (SeeDB2). SeeDB2 matches the refractive indices of fixed tissues to that of immersion oil (1.518), thus minimizing both light scattering and spherical aberrations.
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  • HyVolution – Super-Resolution Imaging with a Confocal Microscope

    Since the invention of the microscope, there has been continual discussion about the possibility of showing more detailed features of specimens as compared to just magnifying them. In this article we describe the HyVolution concept and how the combination of confocal multiparameter fluorescence imaging at the confocal super-resolution regime with psf-based real deconvolution allows high-speed multicolor imaging with a resolution down to 140 nm.
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  • HyVolution – the Smart Path to Confocal Super-Resolution

    Super-resolution refers to any device or method that can resolve better than the classical Abbe limit. Apart from infinite super-resolution techniques such as STED (stimulated emission depletion) and SMLM (single-molecule localization methods) that can theoretically resolve to any detail, there are also methods for limited super-resolution. Here we present HyVolution by Leica, which merges optical super-resolution and computational super-resolution. The optical part is provided by confocal microscopy, and the computational part by deconvolution. Lateral resolution of 140 nm is demonstrated. HyVolution offers multiple fluorescence recording in truly simultaneous mode.
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  • 4Pi-RESOLFT Nanoscopy

    Here we apply the 4Pi scheme to RESOLFT nanoscopy using two-photon absorption for the on-switching of fluorescent proteins. We show that in this combination, the lobes are so low that low-light level, 3D nanoscale imaging of living cells becomes possible. Our method thus offers robust access to densely packed, axially extended cellular regions that have been notoriously difficult to super-resolve. Our approach also entails a fluorescence read-out scheme that translates molecular sensitivity to local off-switching rates into improved signal-to-noise ratio and resolution.
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  • How to Combine STED and CLARITY

    Previously, the preferred way to study the subtlest elements of the kidney, such as foot processes and the slit diaphragm has been by the use of electron microscopy. Using STED microscopy, we show that the nanoscale localization of slit diaphragm proteins can now be resolved using light microscopy. Even if the nanoscopic resolution has been available for a decade, light microscopy studies of the slit diaphragm are not found in the literature. This is likely due to the difficulties of achieving the high quality of fluorescent labelling needed for super-resolution microscopy. By applying an optical clearing protocol based on the CLARITY technique, we found that the immunostaining quality in kidney tissue can be improved. The improvement is likely due to the removal of lipids, resulting in a higher availability of binding epitopes in cleared tissue, as compared to PFA fixed non-cleared tissue.
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Useful Links

Super-Resolution & Nanoscopy Publications

Selected papers on HyVolution

Selected papers on STED

Selected papers on GSDIM

Communities and Web Sources

www.researchgate.net/
Social network for scientists

www.lsoft.com/scripts/wl.exe?SL1=CONFOCALMICROSCOPY&H=LISTS.UMN.EDU
Confocal Microscopy Mailing List, University of Minnesota

www.ibiology.org/
Teaching tools, video lectures on biology and microscopy

bitesizebio.com
Online magazine and community for molecular and cell biology researchers

Search Engines and Data Bases

www.cellimagelibrary.org
Public resource database of images, videos, and animations of cells

harvester.fzk.de/harvester
Bioinformatic meta search engine for genes and proteins

www.gopubmed.com
Search interface for pubmed

en.wikipedia.org/wiki/List_of_academic_databases_and_search_engines
List of academic databases and search engines

scholar.google.com
Beta of Google's search engine for scientific article abstracts

Journals

www.optnano.com/
Optical Nanoscopy

www.doaj.org/
Directory of open access journals

emboj.embopress.org/
The EMBO Journal

www.lifescied.org
CBE-Life Sciences Education – an ASCB online journal

www.sciencemag.org/
Science

www.nature.com/
Nature

www.cell.com/
Biweekly publication of exceptional research articles

jcs.biologists.org/
Journal of Cell Science

dev.biologists.org/
Development

jeb.biologists.org/
The Journal of Experimental Biology

dmm.biologists.org/
DMM Disease Models & Mechanisms

www.biotechniques.com/
International Journal of Life Science Methods

www.opticsinfobase.org/
Collection of Journals and Proceedings in Optics and Photonics

spie.org/x576.xml
SPIE - peer-reviewed journals on applied research in optics and photonics

onlinelibrary.wiley.com/journal/10.1002/(ISSN)1864-0648
Journal of Biophotonics

www.plosone.org/
International, peer-reviewed, open-access, online publication

rspb.royalsocietypublishing.org/
Proceedings B - the Royal Society's biological research journal

www.microscopy-analysis.com/
International Journal for microscopists

Organizations

www.microscopy.org/
Microscopy Society of America

www.eurmicsoc.org/
European Microscopy Society

www.rms.org.uk/
Royal Microscopical Society

www.ascb.org/
ASCB American Society of Cell Biology

www.biologists.com/cob_activities.html
the company of biologists

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