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Delling JP, Bauer HF, Gerlach-Arbeiter S, Schön M, Jacob C, Wagner J, Pedro MT, Knöll B, Boeckers TM. Combined expansion and STED microscopy reveals altered fingerprints of postsynaptic nanostructure across brain regions in ASD-related SHANK3-deficiency. Mol Psychiatry 2024:10.1038/s41380-024-02559-9. [PMID: 38649753 DOI: 10.1038/s41380-024-02559-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 04/02/2024] [Accepted: 04/08/2024] [Indexed: 04/25/2024]
Abstract
Synaptic dysfunction is a key feature of SHANK-associated disorders such as autism spectrum disorder, schizophrenia, and Phelan-McDermid syndrome. Since detailed knowledge of their effect on synaptic nanostructure remains limited, we aimed to investigate such alterations in ex11|SH3 SHANK3-KO mice combining expansion and STED microscopy. This enabled high-resolution imaging of mosaic-like arrangements formed by synaptic proteins in both human and murine brain tissue. We found distinct shape-profiles as fingerprints of the murine postsynaptic scaffold across brain regions and genotypes, as well as alterations in the spatial and molecular organization of subsynaptic domains under SHANK3-deficient conditions. These results provide insights into synaptic nanostructure in situ and advance our understanding of molecular mechanisms underlying synaptic dysfunction in neuropsychiatric disorders.
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Affiliation(s)
- Jan Philipp Delling
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, 89081, Germany.
- Max Planck Institute of Psychiatry, Munich, 80804, Germany.
| | | | | | - Michael Schön
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, 89081, Germany
| | - Christian Jacob
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, 89081, Germany
| | - Jan Wagner
- Department of Neurology, Ulm University, Ulm, 89081, Germany
| | | | - Bernd Knöll
- Institute of Neurobiochemistry, Ulm University, Ulm, 89081, Germany
| | - Tobias M Boeckers
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, 89081, Germany.
- Ulm Site, DZNE, Ulm, 89081, Germany.
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2
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Pesce L, Ricci P, Sportelli G, Belcari N, Sancataldo G. Expansion and Light-Sheet Microscopy for Nanoscale 3D Imaging. SMALL METHODS 2024:e2301715. [PMID: 38461540 DOI: 10.1002/smtd.202301715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 02/10/2024] [Indexed: 03/12/2024]
Abstract
Expansion Microscopy (ExM) and Light-Sheet Fluorescence Microscopy (LSFM) are forefront imaging techniques that enable high-resolution visualization of biological specimens. ExM enhances nanoscale investigation using conventional fluorescence microscopes, while LSFM offers rapid, minimally invasive imaging over large volumes. This review explores the joint advancements of ExM and LSFM, focusing on the excellent performance of the integrated modality obtained from the combination of the two, which is refer to as ExLSFM. In doing so, the chemical processes required for ExM, the tailored optical setup of LSFM for examining expanded samples, and the adjustments in sample preparation for accurate data collection are emphasized. It is delve into various specimen types studied using this integrated method and assess its potential for future applications. The goal of this literature review is to enrich the comprehension of ExM and LSFM, encouraging their wider use and ongoing development, looking forward to the upcoming challenges, and anticipating innovations in these imaging techniques.
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Affiliation(s)
- Luca Pesce
- Department of Physics - Enrico Fermi, University of Pisa, Largo Pontecorvo, 3, Pisa, 56127, Italy
| | - Pietro Ricci
- Department of Applied Physics, University of Barcelona, C/Martí i Franquès, 1, Barcelona, 08028, Spain
| | - Giancarlo Sportelli
- Department of Physics - Enrico Fermi, University of Pisa, Largo Pontecorvo, 3, Pisa, 56127, Italy
| | - Nicola Belcari
- Department of Physics - Enrico Fermi, University of Pisa, Largo Pontecorvo, 3, Pisa, 56127, Italy
| | - Giuseppe Sancataldo
- Department of Physics - Emilio Segrè, University of Palermo, Viale delle Scienze, 18, Palermo, 90128, Italy
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Wang UTT, Tian X, Liou YH, Lee SP, Hu HT, Lu CH, Lin PT, Cheng YJ, Chen P, Chen BC. Protein and lipid expansion microscopy with trypsin and tyramide signal amplification for 3D imaging. Sci Rep 2023; 13:21922. [PMID: 38081848 PMCID: PMC10713663 DOI: 10.1038/s41598-023-48959-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 12/01/2023] [Indexed: 12/18/2023] Open
Abstract
Expansion microscopy, whereby the relative positions of biomolecules are physically increased via hydrogel expansion, can be used to reveal ultrafine structures of cells under a conventional microscope. Despite its utility for achieving super-resolution imaging, expansion microscopy suffers a major drawback, namely reduced fluorescence signals caused by excessive proteolysis and swelling effects. This caveat results in a lower photon budget and disfavors fluorescence imaging over a large field of view that can cover an entire expanded cell, especially in 3D. In addition, the complex procedures and specialized reagents of expansion microscopy hinder its popularization. Here, we modify expansion microscopy by deploying trypsin digestion to reduce protein loss and tyramide signal amplification to enhance fluorescence signal for point-scanning-based imaging. We name our new methodology TT-ExM to indicate dual trypsin and tyramide treatments. TT-ExM may be applied for both antibody and lipid staining. TT-ExM displayed enhanced protein retention for endoplasmic reticulum and mitochondrial markers in COS-7 cell cultures. Importantly, TT-ExM-based lipid staining clearly revealed the complex 3D membrane structures in entire expanded cells. Through combined lipid and DNA staining, our TT-ExM methodology highlighted mitochondria by revealing their DNA and membrane structures in cytoplasm, as well as the lipid-rich structures formed via phase separation in nuclei at interphase. We also observed lipid-rich chromosome matrices in the mitotic cells. These high-quality 3D images demonstrate the practicality of TT-ExM. Thus, readily available reagents can be deployed in TT-ExM to significantly enhance fluorescence signals and generate high-quality and ultrafine-resolution images under confocal microscopy.
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Affiliation(s)
- Ueh-Ting Tim Wang
- Affiliated Senior High School of National Taiwan Normal University, Taipei, 106348, Taiwan
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Xuejiao Tian
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
- Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Tsing Hua University, Taipei, 11529, Taiwan
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 300, Taiwan
| | - Yae-Huei Liou
- Institute of Molecular Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Sue-Ping Lee
- Institute of Molecular Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Hsiao-Tang Hu
- Institute of Molecular Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Chieh-Han Lu
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
- Institute and Undergraduate Program of Electro-Optical Engineering, National Taiwan Normal University, Taipei, 116, Taiwan
| | - Po-Ting Lin
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Ya-Jen Cheng
- Institute of Molecular Biology, Academia Sinica, Taipei, 11529, Taiwan
- Neuroscience Program, NPAS, Academia Sinica, Taipei, 11529, Taiwan, ROC
| | - Peilin Chen
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Bi-Chang Chen
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan.
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Park S, Wang X, Li X, Huang X, Fong KC, Yu C, Tran AA, Scipioni L, Dai Z, Huang L, Shi X. Proximity Labeling Expansion Microscopy (PL-ExM) resolves structure of the interactome. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.09.566477. [PMID: 38014020 PMCID: PMC10680661 DOI: 10.1101/2023.11.09.566477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Elucidating the spatial relationships within the protein interactome is pivotal to understanding the organization and regulation of protein-protein interactions. However, capturing the 3D architecture of the interactome presents a dual challenge: precise interactome labeling and super-resolution imaging. To bridge this gap, we present the Proximity Labeling Expansion Microscopy (PL-ExM). This innovation combines proximity labeling (PL) to spatially biotinylate interacting proteins with expansion microscopy (ExM) to increase imaging resolution by physically enlarging cells. PL-ExM unveils intricate details of the 3D interactome's spatial layout in cells using standard microscopes, including confocal and Airyscan. Multiplexing PL-ExM imaging was achieved by pairing the PL with immunofluorescence staining. These multicolor images directly visualize how interactome structures position specific proteins in the protein-protein interaction network. Furthermore, PL-ExM stands out as an assessment method to gauge the labeling radius and efficiency of different PL techniques. The accuracy of PL-ExM is validated by our proteomic results from PL mass spectrometry. Thus, PL-ExM is an accessible solution for 3D mapping of the interactome structure and an accurate tool to access PL quality.
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