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Imaging Cytoskeleton Components by Electron Microscopy

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Cytoskeleton

Part of the book series: Methods in Molecular Biology ((MIMB,volume 2364))

Abstract

The cytoskeleton is a complex of detergent-insoluble components of the cytoplasm playing critical roles in cell motility, shape generation, and mechanical properties of a cell. Fibrillar polymers—actin filaments, microtubules, and intermediate filaments—are major constituents of the cytoskeleton, which constantly change their organization during cellular activities. The actin cytoskeleton is especially polymorphic, as actin filaments can form multiple higher-order assemblies performing different functions. Structural information about cytoskeleton organization is critical for understanding its functions and mechanisms underlying various forms of cellular activity. Because of the nanometer-scale thickness of cytoskeletal fibers, electron microscopy (EM) is a key tool to determine the structure of the cytoskeleton.

This article describes application of rotary shadowing (or platinum replica ) EM (PREM) for visualization of the cytoskeleton . The procedure is applicable to thin cultured cells growing on glass coverslips and consists of detergent extraction (or mechanical “unroofing”) of cells to expose their cytoskeleton , chemical fixation to provide stability, ethanol dehydration and critical point drying to preserve three-dimensionality, rotary shadowing with platinum to create contrast, and carbon coating to stabilize replicas. This technique provides easily interpretable three-dimensional images, in which individual cytoskeletal fibers are clearly resolved and individual proteins can be identified by immunogold labeling. More importantly, PREM is easily compatible with live cell imaging, so that one can correlate the dynamics of a cell or its components, e.g., expressed fluorescent proteins, with high-resolution structural organization of the cytoskeleton in the same cell.

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Acknowledgments

The author acknowledges the current support from NIH grant R01 GM 095977.

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Authors and Affiliations

  1. Department of Biology, University of Pennsylvania, Philadelphia, PA, USA

    Tatyana Svitkina

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  1. Tatyana Svitkina
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Correspondence to Tatyana Svitkina .

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  1. Professor Emeritus, Brooklyn College – CUNY, Brooklyn, NY, USA

    Ray H. Gavin

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Svitkina, T. (2022). Imaging Cytoskeleton Components by Electron Microscopy. In: Gavin, R.H. (eds) Cytoskeleton . Methods in Molecular Biology, vol 2364. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-1661-1_2

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  • DOI: https://doi.org/10.1007/978-1-0716-1661-1_2

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