Abstract
Many biological studies require the analysis of ultrastructural changes at the level of cell organelles and macromolecules. Since the resolution of modern confocal microscope is limited by the diffraction limit (200–300 nm), it is impossible to study such small objects using standard fluorescence microscopy. Ultra-high resolution microscopy methods require expensive equipment and are technically difficult in use, which in turn limits their widespread practical application. However, recently appeared methods make it possible to increase the resolution of microscopy not by improving the image registration system, but by physically isotropic expansion of a biological sample using a controlled chemical process. Due to this method, called expansion or expansive microscopy (ExM), it became possible to obtain three-dimensional images of samples with a resolution sufficient to study individual cell organelles using a conventional confocal microscope. This review covers the history of this method, its basic principles and examples of use in various fields of biology and medicine, as well as reflects future directions for improving this technology. The article discusses the methodological features of the ExM application in a study of brain tissue samples using the algorithm that allows adaptation of the standard protocol to the goals and objectives of a particular study.
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Funding
This work was supported by the Russian Science Foundation; grant No. 20–45–01004 to I.B. Bezprozvanny. E.I. Pchitskaya is a President of the Russian Federation scholarship recipient; No. SP–3122.2021.4.
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The idea of work and the planning of the experiment (I.B.B., E.I.P., K.Z.D.), data collection (K.Z.D., E.I.P., A.V.R.), data processing (K.Z.D., E.I.P., A.V.R.), writing and editing the manuscript (K.Z.D., E.I.P., I.B.B.).
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Translated by A. Polyanovsky
Russian Text © The Author(s), 2021, published in Rossiiskii Fiziologicheskii Zhurnal imeni I.M. Sechenova, 2021, Vol. 107, Nos. 4–5, pp. 568–583https://doi.org/10.31857/S0869813921040075.
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Derevtsova, K.Z., Pchitskaya, E.I., Rakovskaya, A.V. et al. Applying the Expansion Microscopy Method in Neurobiology. J Evol Biochem Phys 57, 681–693 (2021). https://doi.org/10.1134/S0022093021030157
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DOI: https://doi.org/10.1134/S0022093021030157