Name: Gelling the Archived or Freshly Prepared Clinical Tissue Slides
Uploaded: 2023-10-06T12:20:00
Description: Watch this Scientific Journal Video about Gelling the Archived or Freshly Prepared Clinical Tissue Slides at JoVE.com

gelling the archived or freshly prepared clinical tissue slides

Microscopie à expansion pour une expansion robuste de 11 fois

Biological systems&#160;exhibit structural heterogeneity, from the limbs and the organs down to the levels of proteins at the nanoscale. Therefore, a complete understanding of the operation of these systems requires visual examination across these size scales. However, the diffraction limit of light causes challenges in visualizing structures smaller than ~200-300 nm on a conventional fluorescence microscope. In addition, optical super-resolution methods1,2,3, such as stimulated emission depletion (STED), photo-activated localization microscopy (PALM), stochastic optical reconstruction microscopy (STORM), and structured illumination microscopy (SIM), though powerful, present their own challenges, as they require expensive hardware and reagents and often have slow acquisition times and a poor ability to image large volumes in 3D.
Expansion microscopy4 (ExM) provides an alternative means of circumventing the diffraction limit of light by covalently anchoring biomolecules into a water-swellable polymer gel and physically pulling them apart, thus rendering them resolvable on conventional optical microscopes. A multitude of ExM protocol variants have been developed since the original publication of&#160;ExM less than a decade ago, and these protocols allow the direct incorporation of proteins5,6,7, RNA8,9,10, or lipids11,12,13 into the gel network by altering the chemical anchor or expanding the sample further (thus improving the effective resolution) either in a single step14 or multiple iterative steps15,16. Until recently, no single ExM protocol could retain these three biomolecule classes with a single commercially available chemical anchor while providing a mechanically sturdy gel that could expand ~10-fold in a single expansion round.
Here, we present Magnify17, a recent addition to the ExM arsenal that uses methacrolein as the biomolecule anchor. Methacrolein forms covalent bonds with tissue like that of paraformaldehyde, ensuring that multiple classes of biomolecules can be retained within the gel network without requiring various specific or custom anchoring agents. Additionally, this technique can expand a broad spectrum of tissues up to 11-fold, including notoriously challenging samples such as formalin-fixed paraffin-embedded (FFPE) clinical samples. Previous methods for expanding such mechanically rigid samples required harsh protease digestion, rendering the antibody labeling of proteins of interest impossible after the sample had been expanded. In contrast, this technique achieves the expansion of FFPE clinical samples using a hot denaturing solution, thus preserving whole protein epitopes within the gel, which can be targeted for post-expansion imaging (Figure 1).

Pleins feux sur l’auteur : Rétention moléculaire universelle avec microscopie à expansion 11 fois  

Rétention moléculaire universelle avec microscopie à expansion 11 fois

We're trying to find easy and low cost ways for researchers to image their biological specimens at resolutions below the diffraction limit, particularly in the areas of neuroscience and clinical pathology. Many recent expansion microscopy developments involve modifying gel chemistry to expand samples further, changing the anchoring molecule to visualize different targets and utilizing heating alteration to preserve protein epitopes. With innovated magnify, a robust expansion microscopy method that allows nanoscale imaging of various biological or clinical specimens.It simplifies super resolution microscopy by eliminating specialized equipment needs while preserving intricate biological features with up to 15 nanometers resolution, hence increasing accessibility and utility in labs worldwide. Previously users had to experiment with different expansion microscopy techniques, depending on the tissue and biomolecules they wanted to image. Magnify enables high resolution imaging across various biomolecules and tissue types without requiring specific anchoring steps or specialized equipment, thus bridging a significant gap in nanoscale imaging.Magnify expands tougher clinical samples over fourfold while preserving protein epitopes enabling more accurate investigation of queuing disease. Its chemical anchor also preserves a wide range of biomolecules, making it useful for basic research in animal models Magnify simplifies nanoscale imaging of biomolecules and intact specimens without complex optics or specialized equipment. It's adaptable across various imaging modalities and expansion microscopy strategies, allowing accessible cost-effective nanoscale imaging that may accelerate drug treatments and disease studies while potentially transforming tissue atlas generation.Magnify offers endless possibilities for research. Current focus areas include expanding tissue site, investigating pathological human samples at the nanoscale and studying the smallest scale changes on brain during learning and disease.

Watch this Scientific Journal Video about Gelling the Archived or Freshly Prepared Clinical Tissue Slides at JoVE.com

Gelling the Archived or Freshly Prepared Clinical Tissue Slides  

Gélification des lames de tissus cliniques archivées ou fraîchement préparées

Commencez par prendre les lames de tissu cérébral de souris archivées et fraîches préparées ou fixées au paraformaldéhyde. Coupez de minces morceaux de verre de couverture avec un stylo à pointe de diamant pour fabriquer des entretoises. Ensuite, fixez-les à la glissière avec de petites quantités d’eau, de PBS ou de superglue.Placez doucement les entretoises de chaque côté du tissu. Préparer la solution gélifiante finale en combinant les réactifs immédiatement avant utilisation. Placez la lame dans une boîte de Petri après avoir retiré l’excès de solution de la section de tissu.Ajouter la solution gélifiante froide fraîchement préparée à l’échantillon et incuber le mélange sur le tissu pendant 30 minutes à quatre degrés Celsius pour permettre la diffusion dans le tissu. Placez soigneusement une deuxième lame de verre non couchée sur le tissu et la solution de gel, en évitant les bulles d’air. Laisser les échantillons polymériser en les incubant pendant une nuit à 37 degrés Celsius dans un environnement humidifié.

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Gelling the Archived or Freshly Prepared Clinical Tissue Slides

Universal Molecular Retention with 11-Fold Expansion Microscopy

The nanoscale imaging of biological specimens can improve the understanding of disease pathogenesis. In recent years, expansion microscopy (ExM) has been ...