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Ye X, Guan M, Guo Y, Liu X, Wang K, Chen T, Zhao S, Chen L. Live-cell super-resolution imaging unconventional dynamics and assemblies of nuclear pore complexes. Biophys Rep 2023; 9:206-214. [PMID: 38516621 PMCID: PMC10951474 DOI: 10.52601/bpr.2023.230010] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 11/21/2023] [Indexed: 03/23/2024] Open
Abstract
Super-resolution microscopy has promoted the development of cell biology, but imaging proteins with low copy numbers in cellular structures remains challenging. The limited number of designated proteins within nuclear pore complexes (NPCs) impedes continuous observation in live cells, although they are often used as a standard for evaluating various SR methods. To address this issue, we tagged POM121 with Halo-SiR and imaged it using structured illumination microscopy with sparse deconvolution (Sparse-SIM). Remarkably, POM121-SiR exhibited more than six-fold fluorescence intensity and four-fold enhanced contrast compared to the same protein labeled with tandem-linked mCherry, while showing negligible photo-bleaching during SR imaging for 200 frames. Using this technique, we discovered various types of NPCs, including ring-like and cluster-like structures, and observed dynamic remodeling along with the sequential appearance of different Nup compositions. Overall, Halo-SiR with Sparse-SIM is a potent tool for extended SR imaging of dynamic structures of NPCs in live cells, and it may also help visualize proteins with limited numbers in general.
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Affiliation(s)
- Xianxin Ye
- National Biomedical Imaging Center, State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing 100871, China
| | - Minzhu Guan
- Key Laboratory of Laser Life Science, Ministry of Education, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Yaorong Guo
- Key Laboratory of Laser Life Science, Ministry of Education, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Xiang Liu
- National Biomedical Imaging Center, State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing 100871, China
| | - Kunhao Wang
- Key Laboratory of Laser Life Science, Ministry of Education, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Tongsheng Chen
- Key Laboratory of Laser Life Science, Ministry of Education, College of Biophotonics, South China Normal University, Guangzhou 510631, China
| | - Shiqun Zhao
- National Biomedical Imaging Center, State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing 100871, China
| | - Liangyi Chen
- National Biomedical Imaging Center, State Key Laboratory of Membrane Biology, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, College of Future Technology, Peking University, Beijing 100871, China
- PKU-IDG/McGovern Institute for Brain Research, Beijing 100871, China
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Cedro L, Hasler PW, Meier C, Povazay B, Burri C, Mooser M, Kaiser P, Rothenbuehler SP, Müller PL, Zarranz-Ventura J, Egan C, Tufail A, Scholl HPN, Maloca PM. Feasibility and Safety of a Coaxial Dual-Wavelength Optical Coherence Tomography Apparatus. Ophthalmic Res 2020; 64:55-61. [PMID: 32428922 DOI: 10.1159/000508751] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 03/05/2020] [Accepted: 05/05/2020] [Indexed: 11/19/2022]
Abstract
PURPOSE To evaluate the feasibility and safety of a coaxial dual-wavelength optical coherence tomography (OCT) device (marked as Hydra-OCT). METHODS Healthy participants without ocular pathology underwent retinal imaging using the Hydra-OCT allowing for simultaneous measurement of retinal scanning of 840 and 1,072 nm wavelength. Before and after measurement, best-corrected visual acuity and patients' comfort were assessed. Representative OCT images from both wavelengths were compared by 5 independent graders using a subjective grading scheme. RESULTS A total of 30 eyes of 30 participants (8 females and 22 males) with a mean age of 26.5 years (range from 19 to 55 years) were included. Dual-wavelength image acquisition was made possible in each subject. The participant's effort and comfort assessment using the Hydra-OCT imaging revealed an equivalent value as compared to the commercially available OCT machine. No adverse events were reported, and visual acuity was not altered by the Hydra-OCT. Imaging between the systems was comparable. CONCLUSIONS This study provides evidence for the feasibility and safety of a coaxial dual-wavelength OCT imaging method under real-life conditions. The novel Hydra-OCT imaging device may offer additional insights into the pathology of retinal and choroidal diseases.
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Affiliation(s)
- Luca Cedro
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland
| | - Pascal W Hasler
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland.,OCTlab, Department of Ophthalmology, University Hospital Basel, Basel, Switzerland
| | - Christoph Meier
- Institute for Human Centered Engineering (HuCE) optoLab, Bern University of Applied Sciences, Bern, Switzerland
| | - Boris Povazay
- Institute for Human Centered Engineering (HuCE) optoLab, Bern University of Applied Sciences, Bern, Switzerland
| | - Christian Burri
- Institute for Human Centered Engineering (HuCE) optoLab, Bern University of Applied Sciences, Bern, Switzerland
| | - Matthias Mooser
- Institute for Human Centered Engineering (HuCE) optoLab, Bern University of Applied Sciences, Bern, Switzerland
| | - Pascal Kaiser
- Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland
| | - Simon P Rothenbuehler
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland.,OCTlab, Department of Ophthalmology, University Hospital Basel, Basel, Switzerland
| | - Philipp L Müller
- Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom
| | | | - Catherine Egan
- Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom
| | - Adnan Tufail
- Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom
| | - Hendrik P N Scholl
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland.,OCTlab, Department of Ophthalmology, University Hospital Basel, Basel, Switzerland.,Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland.,Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA
| | - Peter M Maloca
- Department of Ophthalmology, University Hospital Basel, Basel, Switzerland, .,OCTlab, Department of Ophthalmology, University Hospital Basel, Basel, Switzerland, .,Institute of Molecular and Clinical Ophthalmology Basel (IOB), Basel, Switzerland, .,Moorfields Eye Hospital NHS Foundation Trust, London, United Kingdom,
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Peñate-Medina O, Tower RJ, Peñate-Medina T, Will O, Saris PEJ, Suojanen J, Sorsa T, Huuskonen L, Hiippala K, Satokari R, Glüer CC, de Vos WM, Reunanen J. Universal membrane-labeling combined with expression of Katushka far-red fluorescent protein enables non-invasive dynamic and longitudinal quantitative 3D dual-color fluorescent imaging of multiple bacterial strains in mouse intestine. BMC Microbiol 2019; 19:167. [PMID: 31319790 PMCID: PMC6639909 DOI: 10.1186/s12866-019-1538-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 06/30/2019] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND The human gastrointestinal (GI) tract microbiota has been a subject of intense research throughout the 3rd Millennium. Now that a general picture about microbiota composition in health and disease is emerging, questions about factors determining development of microbiotas with specific community structures will be addressed. To this end, usage of murine models for colonization studies remains crucial. Optical in vivo imaging of either bioluminescent or fluorescent bacteria is the basis for non-invasive detection of intestinal colonization of bacteria. Although recent advances in in vivo fluorescence imaging have overcome many limitations encountered in bioluminescent imaging of intestinal bacteria, such as requirement for live cells, high signal attenuation and 2D imaging, the method is still restricted to bacteria for which molecular cloning tools are available. RESULTS Here, we present usage of a lipophilic fluorescent dye together with Katushka far-red fluorescent protein to establish a dual-color in vivo imaging system to monitor GI transit of different bacterial strains, suitable also for strains resistant to genetic labeling. Using this system, we were able to distinguish two different E. coli strains simultaneously and show their unique transit patterns. Combined with fluorescence molecular tomography, these distinct strains could be spatially and temporally resolved and quantified in 3D. CONCLUSIONS Developed novel method for labeling microbes and identify their passage both temporally and spatially in vivo makes now possible to monitor all culturable bacterial strains, also those that are resistant to conventional genetic labeling.
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Affiliation(s)
- Oula Peñate-Medina
- Molecular Imaging North Competence Center, Section Biomedical Imaging, Department of Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Am Botanischen Garten 14, 24118 Kiel, Germany
| | - Robert J. Tower
- Molecular Imaging North Competence Center, Section Biomedical Imaging, Department of Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Am Botanischen Garten 14, 24118 Kiel, Germany
| | - Tuula Peñate-Medina
- Molecular Imaging North Competence Center, Section Biomedical Imaging, Department of Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Am Botanischen Garten 14, 24118 Kiel, Germany
| | - Olga Will
- Molecular Imaging North Competence Center, Section Biomedical Imaging, Department of Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Am Botanischen Garten 14, 24118 Kiel, Germany
| | - Per E. J. Saris
- Department of Food and Environmental Sciences, University of Helsinki, Viikinkaari 9, 00014 Helsinki, Finland
| | - Juho Suojanen
- Cleft Palate and Craniofacial Centre, Department of Plastic Surgery, Helsinki University Hospital, Helsinki University Central Hospital, Topeliuksenkatu 5, 00029 Helsinki, Finland
- Päijät-Häme Joint Authority for Health and Wellbeing, Department of Oral and Maxillo-Facial Surgery, Keskussairaalankatu 7, 15850 Lahti, Finland
| | - Timo Sorsa
- Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 4E, 00029 Helsinki, Finland
- Division of Periodontology, Department of Dental Medicine, Karolinska Institutet, Alfreds Nobels Alle 8, Huddinge, 14104 Stockholm, Sweden
| | - Laura Huuskonen
- Department of Bacteriology and Immunology and Immunobiology Research Program, Faculty of Medicine, University of Helsinki, Haartmaninkatu 2, 00014 Helsinki, Finland
| | - Kaisa Hiippala
- Department of Bacteriology and Immunology and Immunobiology Research Program, Faculty of Medicine, University of Helsinki, Haartmaninkatu 2, 00014 Helsinki, Finland
| | - Reetta Satokari
- Department of Bacteriology and Immunology and Immunobiology Research Program, Faculty of Medicine, University of Helsinki, Haartmaninkatu 2, 00014 Helsinki, Finland
| | - Claus C. Glüer
- Molecular Imaging North Competence Center, Section Biomedical Imaging, Department of Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Am Botanischen Garten 14, 24118 Kiel, Germany
| | - Willem M. de Vos
- Department of Bacteriology and Immunology and Immunobiology Research Program, Faculty of Medicine, University of Helsinki, Haartmaninkatu 2, 00014 Helsinki, Finland
- Department of Veterinary Biosciences, University of Helsinki, Agnes Sjöberginkatu 2, 00014 Helsinki, Finland
- Laboratory of Microbiology, Wageningen University, Wageningen, 6708 PB The Netherlands
| | - Justus Reunanen
- Biocenter Oulu & Cancer and Translational Medicine Research Unit, University of Oulu, Aapistie 5, 90220 Oulu, Finland
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