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Kanemaru T, Kondo T, Nakamura KI, Morimoto H, Nishi K, Isobe SI. A Simple Preparation Method for CLEM Using Pre-Embedding Immunohistochemistry with a Novel Fluorescent Probe and Stable Embedding Resin. Microscopy (Oxf) 2021; 70:368-374. [PMID: 33501988 DOI: 10.1093/jmicro/dfab005] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 01/22/2021] [Indexed: 11/13/2022] Open
Abstract
Correlative light and electron microscopy (CLEM) is an excellent approach for examining the cellular localization of biomolecules. Here, we developed a simple method for CLEM by combining pre-embedding immunohistochemistry with a novel fluorescent probe, namely Fluolid NS Orange, and an embedding resin called 'Durcupan™'. Specimens were embedded in Durcupan™ or LR White after immunolabeling and post-fixation using glutaraldehyde and osmium tetroxide. Next, ultrathin sections were prepared on a finder grid with navigation markers. The section of the specimen embedded in Durcupan™ was found to be more stable against electron beam irradiation than specimens embedded in LR White. A fluorescence light microscopy (FLM) image and a transmission electron microscopy (TEM) image, at wide-field, and low magnification, were independently obtained with the same ultrathin section. Using the three corners between finder grid bars as landmarks, FLM images were superimposed with wide-field, low magnification TEM images to identify the region of interest (ROI), which was subsequently enlarged to ascertain cellular structures localized beneath fluorescent signals. However, the enlarged TEM images appeared blurred and fluorescence signals had a hazy appearance. To resolve this, the enlarged TEM images were replaced by high-resolution TEM images focused directly on the ROI, thereby facilitating the collection of high-resolution CLEM images. The simple sample processing method for CLEM using osmium-resistant Fluolid NS Orange and electron beam damage-resistant Durcupan™ allowed the determination of the precise localization of fluorescence signals at subcellular levels.
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Affiliation(s)
- Takaaki Kanemaru
- Department of Morphology Core Unit, Kyushu University Hospital, 3-1-1 Maidashi, Higashi-ku, Fukuoka-city, Fukuoka, 812-8582, Japan
| | - Teruyoshi Kondo
- Department of Animal Pharmaceutical Sciences, School of Pharmaceutical Sciences, Kyushu University of Health and Welfare, 1714-1 Yoshinomachi, Nobeoka-city, Miyazaki, 882-8508, Japan
| | - Kei-Ichiro Nakamura
- Division of Microscopic and Developmental Anatomy, Department of Anatomy, Kurume University School of Medicine, 67 Asahi-machi, Kurume-city, Fukuoka, 830-0011, Japan
| | - Hiroyuki Morimoto
- Second Department of Anatomy, Faculty of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu-city, Fukuoka, 807-8555, Japan
| | - Kentaro Nishi
- Department of Life Science, Faculty of Life Science, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-ku, Fukuoka-city, Fukuoka, 813-8503, Japan
| | - Shin-Ichiro Isobe
- Department of Life Science, Faculty of Life Science, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-ku, Fukuoka-city, Fukuoka, 813-8503, Japan
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