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Tanida I, Yamaguchi J, Suzuki C, Kakuta S, Uchiyama Y. Recent advances in in-resin correlative light and electron microscopy of Epon-embedded cells. Microscopy (Oxf) 2023; 72:383-387. [PMID: 37217182 DOI: 10.1093/jmicro/dfad028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/10/2023] [Accepted: 05/17/2023] [Indexed: 05/24/2023] Open
Abstract
Correlative fluorescent and electron microscopic images of the same section of epoxy (or other polymer)-embedded samples, hereafter referred to as 'in-resin CLEM', have been developed to improve the positional accuracy and Z-axis resolution limitations of conventional correlative light and electron microscopy (CLEM). High-pressure freezing and quick-freezing substitution result in in-resin CLEM of acrylic-based resin-embedded cells expressing green fluorescent protein, yellow fluorescent protein, mVenus and mCherry, which are sensitive to osmium tetroxide. The identification of osmium-resistant fluorescent proteins leads to the development of in-resin CLEM of Epon-embedded cells. Using subtraction-based fluorescence microscopy with a photoconvertible fluorescent protein, mEosEM-E, its green fluorescence can be observed in thin sections of Epon-embedded cells, and two-color in-resin CLEM using mEosEM-E and mScarlet-H can be performed. Green fluorescent proteins, CoGFP variant 0 and mWasabi, and far-red fluorescent proteins, mCherry2 and mKate2, are available for in-resin CLEM of Epon-embedded cells using the standard procedure for Epon-embedding with additional incubation. Proximity labeling is applied to in-resin CLEM to overcome the limitations of fluorescent proteins in epoxy resin. These approaches will contribute significantly to the future of CLEM analysis.
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Affiliation(s)
- Isei Tanida
- Department of Cellular and Molecular Neuropathology, Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
| | - Junji Yamaguchi
- Department of Cellular and Molecular Neuropathology, Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
- Laboratory of Morphology and Image Analysis, Biomedical Research Core Facilities, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
| | - Chigure Suzuki
- Department of Cellular and Molecular Neuropathology, Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
- Department of Cellular and Molecular Pharmacology, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
- Center for Diversity and Inclusion, Juntendo University School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
| | - Soichiro Kakuta
- Department of Cellular and Molecular Neuropathology, Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
- Laboratory of Morphology and Image Analysis, Biomedical Research Core Facilities, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
| | - Yasuo Uchiyama
- Department of Cellular and Molecular Neuropathology, Research Institute for Diseases of Old Age, Juntendo University Graduate School of Medicine, 2-1-1, Hongo, Bunkyo, Tokyo 113-8421, Japan
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