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Chen H, Yan G, Wen MH, Brooks KN, Zhang Y, Huang PS, Chen TY. Advancements and Practical Considerations for Biophysical Research: Navigating the Challenges and Future of Super-resolution Microscopy. CHEMICAL & BIOMEDICAL IMAGING 2024; 2:331-344. [PMID: 38817319 PMCID: PMC11134610 DOI: 10.1021/cbmi.4c00019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 04/06/2024] [Accepted: 04/10/2024] [Indexed: 06/01/2024]
Abstract
The introduction of super-resolution microscopy (SRM) has significantly advanced our understanding of cellular and molecular dynamics, offering a detailed view previously beyond our reach. Implementing SRM in biophysical research, however, presents numerous challenges. This review addresses the crucial aspects of utilizing SRM effectively, from selecting appropriate fluorophores and preparing samples to analyzing complex data sets. We explore recent technological advancements and methodological improvements that enhance the capabilities of SRM. Emphasizing the integration of SRM with other analytical methods, we aim to overcome inherent limitations and expand the scope of biological insights achievable. By providing a comprehensive guide for choosing the most suitable SRM methods based on specific research objectives, we aim to empower researchers to explore complex biological processes with enhanced precision and clarity, thereby advancing the frontiers of biophysical research.
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Affiliation(s)
- Huanhuan Chen
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Guangjie Yan
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Meng-Hsuan Wen
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Kameron N. Brooks
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Yuteng Zhang
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Pei-San Huang
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Tai-Yen Chen
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
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2
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Hargreaves R, Duwé S, Rozario AM, Funston AM, Tabor RF, Dedecker P, Whelan DR, Bell TDM. Live-Cell SOFI Correlation with SMLM and AFM Imaging. ACS BIO & MED CHEM AU 2023; 3:261-269. [PMID: 37363082 PMCID: PMC10288496 DOI: 10.1021/acsbiomedchemau.2c00086] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 03/09/2023] [Accepted: 03/10/2023] [Indexed: 06/28/2023]
Abstract
Standard optical imaging is diffraction-limited and lacks the resolving power to visualize many of the organelles and proteins found within the cell. The advent of super-resolution techniques overcame this barrier, enabling observation of subcellular structures down to tens of nanometers in size; however these techniques require or are typically applied to fixed samples. This raises the question of how well a fixed-cell image represents the system prior to fixation. Here we present the addition of live-cell Super-Resolution Optical Fluctuation Imaging (SOFI) to a previously reported correlative process using Single Molecule Localization Microscopy (SMLM) and Atomic Force Microscopy (AFM). SOFI was used with fluorescent proteins and low laser power to observe cellular ultrastructure in live COS-7 cells. SOFI-SMLM-AFM of microtubules showed minimal changes to the microtubule network in the 20 min between live-cell SOFI and fixation. Microtubule diameters were also analyzed through all microscopies; SOFI found diameters of 249 ± 68 nm and SMLM was 71 ± 33 nm. AFM height measurements found microtubules to protrude 26 ± 13 nm above the surrounding cellular material. The correlation of SMLM and AFM was extended to two-color SMLM to image both microtubules and actin. Two target SOFI was performed with various fluorescent protein combinations. rsGreen1-rsKAME, rsGreen1-Dronpa, and ffDronpaF-rsKAME fluorescent protein combinations were determined to be suitable for two target SOFI imaging. This correlative application of super-resolution live-cell and fixed-cell imaging revealed minimal artifacts created for the imaged target structures through the sample preparation procedure and emphasizes the power of correlative microscopy.
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Affiliation(s)
| | - Sam Duwé
- Advanced
Optical Microscopy Centre, Hasselt University, Diepenbeek 3590, Belgium
| | - Ashley M. Rozario
- Department
of Rural Clinical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo 3552, Victoria, Australia
| | - Alison M. Funston
- School
of Chemistry, Monash University, Melbourne, Victoria 3800, Australia
- ARC
Centre of Excellence in Exciton Science, Monash University, Clayton, Victoria 3800, Australia
| | - Rico F. Tabor
- School
of Chemistry, Monash University, Melbourne, Victoria 3800, Australia
| | - Peter Dedecker
- Department
of Chemistry, KU Leuven, Leuven 3001, Belgium
| | - Donna R. Whelan
- Department
of Rural Clinical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo 3552, Victoria, Australia
| | - Toby D. M. Bell
- School
of Chemistry, Monash University, Melbourne, Victoria 3800, Australia
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3
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Li W, Kaminski Schierle GS, Lei B, Liu Y, Kaminski CF. Fluorescent Nanoparticles for Super-Resolution Imaging. Chem Rev 2022; 122:12495-12543. [PMID: 35759536 PMCID: PMC9373000 DOI: 10.1021/acs.chemrev.2c00050] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Super-resolution imaging techniques that overcome the diffraction limit of light have gained wide popularity for visualizing cellular structures with nanometric resolution. Following the pace of hardware developments, the availability of new fluorescent probes with superior properties is becoming ever more important. In this context, fluorescent nanoparticles (NPs) have attracted increasing attention as bright and photostable probes that address many shortcomings of traditional fluorescent probes. The use of NPs for super-resolution imaging is a recent development and this provides the focus for the current review. We give an overview of different super-resolution methods and discuss their demands on the properties of fluorescent NPs. We then review in detail the features, strengths, and weaknesses of each NP class to support these applications and provide examples from their utilization in various biological systems. Moreover, we provide an outlook on the future of the field and opportunities in material science for the development of probes for multiplexed subcellular imaging with nanometric resolution.
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Affiliation(s)
- Wei Li
- Key
Laboratory for Biobased Materials and Energy of Ministry of Education,
College of Materials and Energy, South China
Agricultural University, Guangzhou 510642, People’s Republic
of China,Department
of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, United Kingdom
| | | | - Bingfu Lei
- Key
Laboratory for Biobased Materials and Energy of Ministry of Education,
College of Materials and Energy, South China
Agricultural University, Guangzhou 510642, People’s Republic
of China,B. Lei.
| | - Yingliang Liu
- Key
Laboratory for Biobased Materials and Energy of Ministry of Education,
College of Materials and Energy, South China
Agricultural University, Guangzhou 510642, People’s Republic
of China
| | - Clemens F. Kaminski
- Department
of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, United Kingdom,C. F. Kaminski.
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4
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Rozario AM, Duwé S, Elliott C, Hargreaves RB, Moseley GW, Dedecker P, Whelan DR, Bell TDM. Nanoscale characterization of drug-induced microtubule filament dysfunction using super-resolution microscopy. BMC Biol 2021; 19:260. [PMID: 34895240 PMCID: PMC8665533 DOI: 10.1186/s12915-021-01164-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 10/11/2021] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND The integrity of microtubule filament networks is essential for the roles in diverse cellular functions, and disruption of its structure or dynamics has been explored as a therapeutic approach to tackle diseases such as cancer. Microtubule-interacting drugs, sometimes referred to as antimitotics, are used in cancer therapy to target and disrupt microtubules. However, due to associated side effects on healthy cells, there is a need to develop safer drug regimens that still retain clinical efficacy. Currently, many questions remain open regarding the extent of effects on cellular physiology of microtubule-interacting drugs at clinically relevant and low doses. Here, we use super-resolution microscopies (single-molecule localization and optical fluctuation based) to reveal the initial microtubule dysfunctions caused by nanomolar concentrations of colcemid. RESULTS We identify previously undetected microtubule (MT) damage caused by clinically relevant doses of colcemid. Short exposure to 30-80 nM colcemid results in aberrant microtubule curvature, with a trend of increased curvature associated to increased doses, and curvatures greater than 2 rad/μm, a value associated with MT breakage. Microtubule fragmentation was detected upon treatment with ≥ 100 nM colcemid. Remarkably, lower doses (< 20 nM after 5 h) led to subtle but significant microtubule architecture remodelling characterized by increased curvature and suppression of microtubule dynamics. CONCLUSIONS Our results support the emerging hypothesis that microtubule-interacting drugs induce non-mitotic effects in cells, and establish a multi-modal imaging assay for detecting and measuring nanoscale microtubule dysfunction. The sub-diffraction visualization of these less severe precursor perturbations compared to the established antimitotic effects of microtubule-interacting drugs offers potential for improved understanding and design of anticancer agents.
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Affiliation(s)
- Ashley M Rozario
- School of Chemistry, Monash University, Clayton, 3800, Australia
| | - Sam Duwé
- Biomedical Research Institute, Hasselt University, 3590, Diepenbeek, Belgium
| | - Cade Elliott
- School of Chemistry, Monash University, Clayton, 3800, Australia
| | | | - Gregory W Moseley
- Department of Microbiology, Monash Biomedicine Discovery Institute, Clayton, 3800, Australia
| | - Peter Dedecker
- Department of Chemistry, KU Leuven, 3001, Leuven, Belgium
| | - Donna R Whelan
- La Trobe Institute for Molecular Science, La Trobe University, Bendigo, 3552, Australia.
| | - Toby D M Bell
- School of Chemistry, Monash University, Clayton, 3800, Australia.
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5
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Urban JM, Chiang W, Hammond JW, Cogan NMB, Litzburg A, Burke R, Stern HA, Gelbard HA, Nilsson BL, Krauss TD. Quantum Dots for Improved Single-Molecule Localization Microscopy. J Phys Chem B 2021; 125:2566-2576. [PMID: 33683893 PMCID: PMC8080873 DOI: 10.1021/acs.jpcb.0c11545] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Colloidal semiconductor quantum dots (QDs) have long established their versatility and utility for the visualization of biological interactions. On the single-particle level, QDs have demonstrated superior photophysical properties compared to organic dye molecules or fluorescent proteins, but it remains an open question as to which of these fundamental characteristics are most significant with respect to the performance of QDs for imaging beyond the diffraction limit. Here, we demonstrate significant enhancement in achievable localization precision in QD-labeled neurons compared to neurons labeled with an organic fluorophore. Additionally, we identify key photophysical parameters of QDs responsible for this enhancement and compare these parameters to reported values for commonly used fluorophores for super-resolution imaging.
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Affiliation(s)
- Jennifer M Urban
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Wesley Chiang
- Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, New York 14642, United states
| | - Jennetta W Hammond
- Center for Neurotherapeutics Discovery and Department of Neurology, University of Rochester Medical Center, Rochester, New York 14642, United states
| | - Nicole M B Cogan
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Angela Litzburg
- Center for Neurotherapeutics Discovery and Department of Neurology, University of Rochester Medical Center, Rochester, New York 14642, United states
| | - Rebeckah Burke
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Harry A Stern
- Center for Integrated Research and Computing, University of Rochester, Rochester, New York 14627-0216, United States
| | - Harris A Gelbard
- Center for Neurotherapeutics Discovery and Department of Neurology, University of Rochester Medical Center, Rochester, New York 14642, United states
- Departments of Pediatrics, Neuroscience, and Microbiology and Immunology, University of Rochester Medical Center, Rochester, New York 14642, United states
| | - Bradley L Nilsson
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Todd D Krauss
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
- The Institute of Optics, University of Rochester, Rochester, New York 14627-0216, United States
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6
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Wang X, Zhong J, Wang M, Xiong H, Han D, Zeng Y, He H, Tan H. Enhanced temporal and spatial resolution in super-resolution covariance imaging algorithm with deconvolution optimization. JOURNAL OF BIOPHOTONICS 2021; 14:e202000292. [PMID: 33107151 DOI: 10.1002/jbio.202000292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 10/20/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
Based on the numerical analysis that covariance exhibits superior statistical precision than cumulant and variance, a new SOFI algorithm by calculating the n orders covariance for each pixel is presented with an almost 2n -fold resolution improvement, which can be enhanced to 2n via deconvolution. An optimized deconvolution is also proposed by calculating the (n + 1) order SD associated with each n order covariance pixel, and introducing the results into the deconvolution as a damping factor to suppress noise generation. Moreover, a re-deconvolution of the covariance image with the covariance-equivalent point spread function is used to further increase the final resolution by above 2-fold. Simulated and experimental results show that this algorithm can significantly increase the temporal-spatial resolution of SOFI, meanwhile, preserve the sample's structure. Thus, a resolution of 58 nm is achieved for 20 experimental images, and the corresponding acquisition time is 0.8 seconds.
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Affiliation(s)
- Xuehua Wang
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, Guang dong, China
| | - Junping Zhong
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, Guang dong, China
| | - Mingyi Wang
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, Guang dong, China
| | - Honglian Xiong
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, Guang dong, China
| | - Dingan Han
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, Guang dong, China
| | - Yaguang Zeng
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, Guang dong, China
| | - Haiying He
- School of Materials Science and Energy Engineering, Foshan University, Foshan, Guang dong, China
| | - Haishu Tan
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, Guang dong, China
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7
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Xu Y, Xu R, Wang Z, Zhou Y, Shen Q, Ji W, Dang D, Meng L, Tang BZ. Recent advances in luminescent materials for super-resolution imaging via stimulated emission depletion nanoscopy. Chem Soc Rev 2021; 50:667-690. [DOI: 10.1039/d0cs00676a] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Recent progress on STED fluorophores for super-resolution imaging and also their characteristics are outlined here, thus providing some guidelines to select proper probes and even develop new materials for super-resolution imaging via STED nanoscopy.
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Affiliation(s)
- Yanzi Xu
- School of Chemistry
- Xi'an Key Laboratory of Sustainable Energy Material Chemistry
- MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter
- Xi'an Jiao Tong University
- Xi'an 710049
| | - Ruohan Xu
- School of Chemistry
- Xi'an Key Laboratory of Sustainable Energy Material Chemistry
- MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter
- Xi'an Jiao Tong University
- Xi'an 710049
| | - Zhi Wang
- School of Chemistry
- Xi'an Key Laboratory of Sustainable Energy Material Chemistry
- MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter
- Xi'an Jiao Tong University
- Xi'an 710049
| | - Yu Zhou
- Instrumental Analysis Center
- Xi'an Jiao Tong University
- Xi'an
- P. R. China
| | - Qifei Shen
- School of Chemistry
- Xi'an Key Laboratory of Sustainable Energy Material Chemistry
- MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter
- Xi'an Jiao Tong University
- Xi'an 710049
| | - Wenchen Ji
- Department of Orthopedics
- the First Affiliated Hospital of Xi’an Jiaotong University
- P. R. China
| | - Dongfeng Dang
- School of Chemistry
- Xi'an Key Laboratory of Sustainable Energy Material Chemistry
- MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter
- Xi'an Jiao Tong University
- Xi'an 710049
| | - Lingjie Meng
- School of Chemistry
- Xi'an Key Laboratory of Sustainable Energy Material Chemistry
- MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter
- Xi'an Jiao Tong University
- Xi'an 710049
| | - Ben Zhong Tang
- Department of Chemistry
- The Hong Kong University of Science and Technology
- Clear Water Bay
- Kowloon
- P. R. China
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8
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Zhang K, Sun Y, Wu S, Zhou M, Zhang X, Zhou R, Zhang T, Gao Y, Chen T, Chen Y, Yao X, Watanabe Y, Tian M, Zhang H. Systematic imaging in medicine: a comprehensive review. Eur J Nucl Med Mol Imaging 2020; 48:1736-1758. [PMID: 33210241 DOI: 10.1007/s00259-020-05107-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 11/08/2020] [Indexed: 01/05/2023]
Abstract
Systematic imaging can be broadly defined as the systematic identification and characterization of biological processes at multiple scales and levels. In contrast to "classical" diagnostic imaging, systematic imaging emphasizes on detecting the overall abnormalities including molecular, functional, and structural alterations occurring during disease course in a systematic manner, rather than just one aspect in a partial manner. Concomitant efforts including improvement of imaging instruments, development of novel imaging agents, and advancement of artificial intelligence are warranted for achievement of systematic imaging. It is undeniable that scientists and radiologists will play a predominant role in directing this burgeoning field. This article introduces several recent developments in imaging modalities and nanoparticles-based imaging agents, and discusses how systematic imaging can be achieved. In the near future, systematic imaging which combines multiple imaging modalities with multimodal imaging agents will pave a new avenue for comprehensive characterization of diseases, successful achievement of image-guided therapy, precise evaluation of therapeutic effects, and rapid development of novel pharmaceuticals, with the final goal of improving human health-related outcomes.
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Affiliation(s)
- Kai Zhang
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China.,Laboratory for Pathophysiological and Health Science, RIKEN Center for Biosystems Dynamics Research, 6-7-3 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan
| | - Yujie Sun
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center, School of Life Sciences, Peking University, Beijing, China
| | - Shuang Wu
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Min Zhou
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China.,Institute of Translational Medicine, School of Medicine, Zhejiang University, Hangzhou, China
| | - Xiaohui Zhang
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Rui Zhou
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Tingting Zhang
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Yuanxue Gao
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Ting Chen
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Yao Chen
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China
| | - Xin Yao
- Department of Gastroenterology, The First Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Yasuyoshi Watanabe
- Laboratory for Pathophysiological and Health Science, RIKEN Center for Biosystems Dynamics Research, 6-7-3 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan.
| | - Mei Tian
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China.
| | - Hong Zhang
- Department of Nuclear Medicine and PET center, The Second Hospital of Zhejiang University School of Medicine, No. 88 Jiefang Road, Hangzhou, 310009, Zhejiang, China. .,Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou, China. .,The College of Biomedical Engineering and Instrument Science of Zhejiang University, Hangzhou, China.
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9
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Wang B, Liu Z, Zhou L, Fei Y, Yang C, Mi L, Mu Q, Ma J. Active-modulated, random-illumination, super-resolution optical fluctuation imaging. NANOSCALE 2020; 12:16864-16874. [PMID: 32766615 DOI: 10.1039/d0nr03255g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Super-resolution optical fluctuation imaging (SOFI) provides subdiffraction resolution based on the analysis of temporal stochastic intensity fluctuations. However, conventional SOFI imaging relies on the intrinsic blinking properties of fluorescent markers and suffers from severe artifacts and signal losses owing to the unmatched blinking on-time ratio. Herein, we propose active-modulated, random-illumination, super-resolution optical fluctuation imaging that allows the traditional SOFI to overcome the effect of the intrinsic impertinent blinking characteristic of fluorescent markers. We demonstrate theoretically and experimentally that this method of active-modulated random illumination can generate random illumination patterns with a controllable blinking on-time ratio to match the high-order SOFI reconstruction considerably reducing the generated artifacts and signal losses. High-order, high-quality images can be obtained with increased lateral resolution.
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Affiliation(s)
- Baoju Wang
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, 220 Handan Road, Shanghai 200433, China.
| | - Zhijia Liu
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, 220 Handan Road, Shanghai 200433, China.
| | - Li Zhou
- School of Life Sciences, Fudan University, Shanghai 200438, China
| | - Yiyan Fei
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, 220 Handan Road, Shanghai 200433, China.
| | - Chengliang Yang
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China.
| | - Lan Mi
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, 220 Handan Road, Shanghai 200433, China.
| | - Quanquan Mu
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China.
| | - Jiong Ma
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, 220 Handan Road, Shanghai 200433, China. and Insititute of Biomedical Engineering and Technology, Academy for Engineer and Technology, Fudan University, 220 Handan Road, Shanghai 200433, China and The Multiscale Research Institute of Complex Systems (MRICS), School of Life Sciences, Fudan University, 220 Handan Road, Shanghai 200433, China
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10
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Wang B, Yao L, Jing Y, Fei Y, Bai Q, Mi L, Ma J. Multicomposite super-resolution microscopy: Enhanced Airyscan resolution with radial fluctuation and sample expansions. JOURNAL OF BIOPHOTONICS 2020; 13:e2419. [PMID: 31999066 DOI: 10.1002/jbio.201960211] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/07/2020] [Accepted: 01/24/2020] [Indexed: 06/10/2023]
Abstract
Either modulated illumination or temporal fluctuation analysis can assist super-resolution techniques in overcoming the diffraction limit of conventional optical microscopy. As they are not contradictory to each other, an effective combination of spatial and temporal super-resolution mechanisms would further improve the resolution of fluorescent images. Here, a super-resolution imaging method called fluctuation-enhanced Airyscan technology (FEAST) is proposed, which achieves ~40 nm lateral imaging resolution and is useful for a range of fluorescent proteins and organic dyes. It was demonstrated not only to obtain different subcellular super-resolution images, but also to improve the accuracy of counting the average human epidermal growth factor receptor 2 (HER2) copy number for diagnosis in breast cancer. Furthermore, the combination of FEAST and sample expansion microscopy (Ex-FEAST) improves the lateral resolution to ~26 nm.
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Affiliation(s)
- Baoju Wang
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, Shanghai, China
| | - Longfang Yao
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, Shanghai, China
| | - Yueyue Jing
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, Shanghai, China
| | - Yiyan Fei
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, Shanghai, China
| | - Qianming Bai
- Department of Pathology, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Lan Mi
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, Shanghai, China
| | - Jiong Ma
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Green Photoelectron Platform, Fudan University, Shanghai, China
- Institute of Biomedical Engineering and Technology, Academy for Engineer and Technology, Fudan University, Shanghai, China
- Multiscale Research Institute of Complex Systems (MRICS), School of Life Sciences, Fudan University, Shanghai, China
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11
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Liu C, Liu W, Wang S, Li H, Lv Z, Zhang F, Zhang D, Teng J, Zheng T, Li D, Zhang M, Xu P, Gong Q. Super-resolution nanoscopy by coherent control on nanoparticle emission. SCIENCE ADVANCES 2020; 6:eaaw6579. [PMID: 32494590 PMCID: PMC7164939 DOI: 10.1126/sciadv.aaw6579] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 01/24/2020] [Indexed: 05/28/2023]
Abstract
Super-resolution nanoscopy based on wide-field microscopic imaging provided high efficiency but limited resolution. Here, we demonstrate a general strategy to push its resolution down to ~50 nm, which is close to the range of single molecular localization microscopy, without sacrificing the wide-field imaging advantage. It is done by actively and simultaneously modulating the characteristic emission of each individual emitter at high density. This method is based on the principle of excited state coherent control on single-particle two-photon fluorescence. In addition, the modulation efficiently suppresses the noise for imaging. The capability of the method is verified both in simulation and in experiments on ZnCdS quantum dot-labeled films and COS7 cells. The principle of coherent control is generally applicable to single-multiphoton imaging and various probes.
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Affiliation(s)
- Congyue Liu
- State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
| | - Wei Liu
- State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
| | - Shufeng Wang
- State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, Shanxi, China
- Frontiers Science Center for Nano-optoelectronics, Peking University, Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
| | - Hongjia Li
- High Performance Computer Research Center, Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Zhilong Lv
- High Performance Computer Research Center, Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Fa Zhang
- High Performance Computer Research Center, Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China
| | - Donghui Zhang
- Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education and State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Junlin Teng
- Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education and State Key Laboratory of Membrane Biology, College of Life Sciences, Peking University, Beijing 100871, China
| | - Tao Zheng
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Donghai Li
- Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Mingshu Zhang
- Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Pingyong Xu
- Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100101, China
| | - Qihuang Gong
- State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, Shanxi, China
- Frontiers Science Center for Nano-optoelectronics, Peking University, Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
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12
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Himmelstoß SF, Hirsch T. A critical comparison of lanthanide based upconversion nanoparticles to fluorescent proteins, semiconductor quantum dots, and carbon dots for use in optical sensing and imaging. Methods Appl Fluoresc 2019; 7:022002. [PMID: 30822759 DOI: 10.1088/2050-6120/ab0bfa] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The right choice of a fluorescent probe is essential for successful luminescence imaging and sensing and especially concerning in vivo and in vitro applications, the development of new classes have gained more and more attention in the last years. One of the most promising class are upconversion nanoparticles (UCNPs)-inorganic nanocrystals capable to convert near-infrared light in high energy radiation. In this review we will compare UCNPs with other fluorescent probes in terms of (a) the optical properties of the probes, such as their brightness, photostability and excitation wavelength; (b) their chemical properties such as the dispersibility, stability under experimental or physiological conditions, availability of chemical modification strategies for labelling; and (c) the potential toxicity and biocompatibility of the probe. Thereby we want to provide a better understanding of the advantages and drawbacks of UCNPs and address future challenges in the design of the nanocrystals.
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Affiliation(s)
- Sandy F Himmelstoß
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040 Regensburg, Germany
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13
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Zeng Z, Ma J, Chen X, Xu C. Lifetime super-resolution optical fluctuation imaging. J Microsc 2019; 274:87-91. [PMID: 30734939 DOI: 10.1111/jmi.12786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 02/03/2019] [Accepted: 02/06/2019] [Indexed: 10/27/2022]
Abstract
In this paper, we propose a promising super-resolution imaging scheme in fluorescence lifetime domain (lifetime super-resolution optical fluctuation imaging, ltSOFI). ltSOFI has the potential to obtain super-resolution images by taking advantage of fluorescence lifetime blinking under wide-field lifetime detection. The proof-of-concept for ltSOFI was demonstrated through numerical simulation of high-order cumulant analysis on fluorescence lifetime blinking emitters. As a tentative experimental demonstration, we obtained super-resolution lifetime imaging from time-lapse FLIM recording of HeLa cells expressing a cAMP sensor using ltSOFI method. ltSOFI is expected to initiate a new dimension in the lifetime domain for blinking-based super-resolution microscopy. LAY DESCRIPTION: We report on a promising super-resolution imaging scheme in fluorescence lifetime domain (lifetime super-resolution optical fluctuation imaging, ltSOFI). ltSOFI has the potential to obtain super-resolution images by taking advantage of fluorescence lifetime blinking under wide-field lifetime detection. Past advances in super-resolution fluorescence microscopy primarily rely on the spatiotemporal modulation of the fluorescence intensity. Although the applications of the Q-dot blinking have been discussed in the literature, most of the discussions have focused on the blinking of fluorescence intensity. Few studies have shown the possibility of super-resolution imaging through fluorescence lifetime fluctuations. In this paper, we proposed the ltSOFI scheme that explored the possibility of super-resolution reconstruction from the blinking of fluorescence lifetime. The proof-of-concept for ltSOFI was demonstrated through numerical simulation of high-order cumulant analysis on fluorescence lifetime blinking emitters. As a tentative experimental demonstration, we obtained super-resolution lifetime imaging from time-lapse FLIM recording of HeLa cells expressing a cAMP sensor using ltSOFI method. The ltSOFI method is expected to initiate a new dimension in the lifetime domain for blinking-based super-resolution microscopy. Moreover, the existing fluorescence lifetime imaging microscopy and super-resolution nanoscopy can benefit from the implementation of ltSOFI to significantly improve the imaging spatial resolution of fluorescence lifetime images. In addition, the proof-of-concept demonstration achieved by the numerical simulation and tentative experiment will provide a new perspective for obtaining fluorescence lifetime images with much finer details.
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Affiliation(s)
- Zhiping Zeng
- College of Physics and Information Engineering, Fuzhou University, Fuzhou, China
| | - Jing Ma
- College of Physics and Information Engineering, Fuzhou University, Fuzhou, China
| | | | - Canhua Xu
- College of Physics and Information Engineering, Fuzhou University, Fuzhou, China
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14
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Li R, Chen X, Lin Z, Wang Y, Sun Y. Expansion enhanced nanoscopy. NANOSCALE 2018; 10:17552-17556. [PMID: 30225472 DOI: 10.1039/c8nr04267e] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The advance of optical super-resolution fluorescence microscopy has revolutionized our vision of the subcellular world. Further improvement in the spatial resolution is of great significance for structural and functional investigations. The recently developed expansion microscopy (ExM), which achieves sub-diffraction imaging via physical expansion of the sample, provides a great opportunity for further resolution enhancement of existing optical super-resolution techniques. However, although such combination seems apparent, several technical obstacles, especially the dramatic loss of fluorescence signal during ExM sample preparation, have hampered this goal. In this work, aiming at this challenge, we have developed new strategies to retain and increase the fluorescence of the expanded sample. With the new labeling methods, we have successfully made the labeling density of expanded samples sufficing the Nyquist sampling criteria for optical super-resolution imaging, such as stimulated emission depletion microscopy (STED) and super-resolution optical fluctuation imaging (SOFI). The newly developed expansion nanoscopic imaging (ExN) approaches, i.e. ExSTED and ExSOFI, demonstrated up to 4-fold resolution enhancement compared to standard STED and SOFI, providing a simple and effective way to realize high resolution imaging both at the cellular and tissue level.
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Affiliation(s)
- Rongqin Li
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China.
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15
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Yang J, Dong C, Ren J. Chiral ligand‐induced photoluminescence intermittence difference of CdTe quantum dots. LUMINESCENCE 2018; 33:1150-1156. [DOI: 10.1002/bio.3521] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 05/31/2018] [Accepted: 06/07/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Jie Yang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai P. R. China
| | - Chaoqing Dong
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai P. R. China
| | - Jicun Ren
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai P. R. China
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16
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Nanoparticles for super-resolution microscopy and single-molecule tracking. Nat Methods 2018; 15:415-423. [PMID: 29808018 DOI: 10.1038/s41592-018-0012-4] [Citation(s) in RCA: 147] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 04/16/2018] [Indexed: 01/23/2023]
Abstract
We review the use of luminescent nanoparticles in super-resolution imaging and single-molecule tracking, and showcase novel approaches to super-resolution imaging that leverage the brightness, stability, and unique optical-switching properties of these nanoparticles. We also discuss the challenges associated with their use in biological systems, including intracellular delivery and molecular targeting. In doing so, we hope to provide practical guidance for biologists and continue to bridge the fields of super-resolution imaging and nanoparticle engineering to support their mutual advancement.
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17
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Zou L, Zhang S, Wang B, Tan J. High-order super-resolution optical fluctuation imaging based on low-pass denoising. OPTICS LETTERS 2018; 43:707-710. [PMID: 29444058 DOI: 10.1364/ol.43.000707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 01/06/2018] [Indexed: 06/08/2023]
Abstract
A new scheme of super-resolution optical fluctuation imaging (SOFI) is proposed to broaden its application in the high-order case by separating the elimination of shot noise from the computation of cumulant, applying the low-pass denoising (LPD) operator to SOFI. The high-order cumulants are derived from a basic recursion of moments with the suppression of shot noise by the LPD on raw data. SOFI based on LPD (LPD-SOFI) demonstrates a 10.6-fold lateral resolution enhancement with the cumulant order of the 16th and a seven-fold three-dimensional resolution enhancement with the cumulant order of the 10th in experiments performed on a sparse sample of quantum dots.
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18
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Zong S, Zong J, Chen C, Jiang X, Zhang Y, Wang Z, Cui Y. Single molecule localization imaging of exosomes using blinking silicon quantum dots. NANOTECHNOLOGY 2018; 29:065705. [PMID: 29265007 DOI: 10.1088/1361-6528/aaa375] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Discovering new fluorophores, which are suitable for single molecule localization microscopy (SMLM) is important for promoting the applications of SMLM in biological or material sciences. Here, we found that silicon quantum dots (Si QDs) possess a fluorescence blinking behavior, making them an excellent candidate for SMLM. The Si QDs are fabricated using a facile microwave-assisted method. Blinking of Si QDs is confirmed by single particle fluorescence measurement and the spatial resolution achieved is about 30 nm. To explore the potential application of Si QDs as the nanoprobes for SMLM imaging, cell derived exosomes are chosen as the object owing to their small size (50-100 nm in diameter). Since CD63 is commonly presented on the membrane of exosomes, CD63 aptamers are attached to the surface of Si QDs to form nanoprobes which can specifically recognize exosomes. SMLM imaging shows that Si QDs based nanoprobes can indeed realize super resolved optical imaging of exosomes. More importantly, blinking of Si QDs is observed in water or PBS buffer with no need for special imaging buffers. Besides, considering that silicon is highly biocompatible, Si QDs should have minimal cytotoxicity. These features make Si QDs quite suitable for SMLM applications especially for live cell imaging.
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Affiliation(s)
- Shenfei Zong
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
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19
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Super-Resolution Fluorescence Microscopy for Single Cell Imaging. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1068:59-71. [DOI: 10.1007/978-981-13-0502-3_6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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20
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Chen X, Liu Z, Li R, Shan C, Zeng Z, Xue B, Yuan W, Mo C, Xi P, Wu C, Sun Y. Multicolor Super-resolution Fluorescence Microscopy with Blue and Carmine Small Photoblinking Polymer Dots. ACS NANO 2017; 11:8084-8091. [PMID: 28696661 DOI: 10.1021/acsnano.7b02893] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Advances in the development of small photoblinking semiconducting polymer dots (Pdots) have attracted great interest for use in super-resolution microscopy. However, multicolor super-resolution imaging using conventional small photoblinking Pdots remains a challenge due to their limited color choice, broad emission spectrum, and heavy spectrum crosstalk. Here, we introduce two types of small photoblinking Pdots with different colors and relatively narrow emission spectra: blue PFO Pdots and carmine PFTBT5 Pdots for blinking-based statistical nanoscopy. Both of these probes feature ultrahigh single-particle brightness, very strong photostability, superior biocompatibility, and robust fluorescence fluctuation. In addition, these small photoblinking Pdots serve as excellent labels for dual-color super-resolution optical fluctuation imaging (SOFI) of specific subcellular structures, indicating their promise for long-term multicolor SOFI nanoscopy with high spatiotemporal resolution.
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Affiliation(s)
- Xuanze Chen
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Zhihe Liu
- Department of Biomedical Engineering, Southern University of Science and Technology , Shenzhen, Guangdong 510855, China
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun 130012, China
| | - Rongqin Li
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Chunyan Shan
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Zhiping Zeng
- College of Physics and Information Engineering, Fuzhou University , Fuzhou 350116, China
| | - Boxin Xue
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Weihong Yuan
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Chi Mo
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Peng Xi
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
| | - Changfeng Wu
- Department of Biomedical Engineering, Southern University of Science and Technology , Shenzhen, Guangdong 510855, China
| | - Yujie Sun
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University , Beijing 100871, China
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21
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Chen X, Li R, Liu Z, Sun K, Sun Z, Chen D, Xu G, Xi P, Wu C, Sun Y. Small Photoblinking Semiconductor Polymer Dots for Fluorescence Nanoscopy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1604850. [PMID: 27882627 DOI: 10.1002/adma.201604850] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 10/10/2016] [Indexed: 06/06/2023]
Abstract
Two types of small photoblinking Pdots with high brightness, strong photostability, and favorable biocompatibility, are designed. Super-resolution optical fluctuation imaging is achieved using these Pdots. Imaging of subcellular structures demonstrates that these small photoblinking Pdots are outstanding probes for fast, long-term super-resolution fluorescence imaging.
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Affiliation(s)
- Xuanze Chen
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Rongqin Li
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Zhihe Liu
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - Kai Sun
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - Zezhou Sun
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - Danni Chen
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Gaixia Xu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Peng Xi
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, 100871, China
| | - Changfeng Wu
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China
| | - Yujie Sun
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, and Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, 100871, China
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22
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Zong S, Chen C, Zhang Y, Li L, Wang Z, Cui Y. An innovative strategy to obtain extraordinary specificity in immunofluorescent labeling and optical super resolution imaging of microtubules. RSC Adv 2017. [DOI: 10.1039/c7ra06949a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An innovative immunofluorescent labeling strategy for microtubules is presented, which can greatly reduce non-specific binding and improve the immunolabeling specificity.
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Affiliation(s)
- Shenfei Zong
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Chen Chen
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Yizhi Zhang
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Lang Li
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Zhuyuan Wang
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Yiping Cui
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
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23
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Wang X, Chen D, Yu B, Niu H. Statistical precision in super-resolution optical fluctuation imaging. APPLIED OPTICS 2016; 55:7911-7916. [PMID: 27828025 DOI: 10.1364/ao.55.007911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The super-resolution optical fluctuation imaging (SOFI) technique enhances image spatial resolution by calculating the spatiotemporal cross-cumulants of independent stochastic intensity fluctuations of emitters. Ideally, SOFI eliminates any noise that is not correlated over time, but in practice, due to limited data lengths, the statistical uncertainty of cumulants will affect the continuities and homogeneities of SOFI images. Since the variance and signal-to-noise ratio (SNR) characterize cumulant statistical uncertainty, we determined theoretical expressions for these based on a single dataset. From a simulation of temporal fluctuations of blinking fluorescent emitters, we calculated the quantitative relation between the SNR of cumulants and multiple parameters of the blinking signal, such as the on-time ratio, acquisition frame to average blinking rate ratio, sequence length, and photon amplitude, which not only provides a physical interpretation for SOFI phenomena but also theoretical guidance to achieve optimal practical outcomes.
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24
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Zeng Z, Xi P. Advances in three-dimensional super-resolution nanoscopy. Microsc Res Tech 2016; 79:893-898. [DOI: 10.1002/jemt.22719] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 05/18/2016] [Accepted: 06/23/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Zhiping Zeng
- Department of Biomedical Engineering; College of Engineering, Peking University; Beijing 100871 China
| | - Peng Xi
- Department of Biomedical Engineering; College of Engineering, Peking University; Beijing 100871 China
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25
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Chen X, Zeng Z, Li R, Xue B, Xi P, Sun Y. Superior performance with sCMOS over EMCCD in super-resolution optical fluctuation imaging. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:66007. [PMID: 27281064 DOI: 10.1117/1.jbo.21.6.066007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 05/10/2016] [Indexed: 06/06/2023]
Abstract
Super-resolution optical fluctuation imaging (SOFI) is a fast and low-cost live-cell optical nanoscopy for extracting subdiffraction information from the statistics of fluorescence intensity fluctuation. As SOFI is based on the fluctuation statistics, rather than the detection of single molecules, it poses unique requirements for imaging detectors, which still lack a systematic evaluation. Here, we analyze the influences of pixel sizes, frame rates, noise levels, and different gains in SOFI with simulations and experimental tests. Our analysis shows that the smaller pixel size and faster readout speed of scientific-grade complementary metal oxide semiconductor (sCMOS) enables SOFI to achieve high spatiotemporal resolution with a large field-of-view, which is especially beneficial for live-cell super-resolution imaging. Overall, as the performance of SOFI is relatively insensitive to the signal-to-noise ratio (SNR), the gain in pixel size and readout speed exceeds the loss in SNR, indicating sCMOS is superior to electron multiplying charge coupled device in context to SOFI in many cases. Super-resolution imaging of cellular microtubule structures with high-order SOFI is experimentally demonstrated at large field-of-view, taking advantage of the large pixel number and fast frame rate of sCMOS cameras.
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Affiliation(s)
- Xuanze Chen
- Peking University, College of Engineering, Department of Biomedical Engineering, No. 5 Yiheyuan Road Haidian District, Beijing 100871, ChinabPeking University, State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of
| | - Zhiping Zeng
- Peking University, College of Engineering, Department of Biomedical Engineering, No. 5 Yiheyuan Road Haidian District, Beijing 100871, China
| | - Rongqin Li
- Peking University, State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, No. 5 Yiheyuan Road Haidian District, Beijing 100871, China
| | - Boxin Xue
- Peking University, State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, No. 5 Yiheyuan Road Haidian District, Beijing 100871, China
| | - Peng Xi
- Peking University, College of Engineering, Department of Biomedical Engineering, No. 5 Yiheyuan Road Haidian District, Beijing 100871, China
| | - Yujie Sun
- Peking University, State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, No. 5 Yiheyuan Road Haidian District, Beijing 100871, China
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Chen X, Zong W, Li R, Zeng Z, Zhao J, Xi P, Chen L, Sun Y. Two-photon light-sheet nanoscopy by fluorescence fluctuation correlation analysis. NANOSCALE 2016; 8:9982-9987. [PMID: 27121341 DOI: 10.1039/c6nr00324a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Advances in light-sheet microscopy have enabled the fast three-dimensional (3D) imaging of live cells and bulk specimens with low photodamage and phototoxicity. Combining light-sheet illumination with super-resolution imaging is expected to resolve subcellular structures. Actually, such kind of super-resolution light-sheet microscopy was recently demonstrated using a single-molecule localization algorithm. However, the imaging depth and temporal resolution of this method are limited owing to the requirements of precise single molecule localization and reconstruction. In this work, we present two-photon super-resolution light-sheet imaging via stochastic optical fluctuation imaging (2PLS-SOFI), which acquires high spatiotemporal resolution and excellent optical sectioning ability. 2PLS-SOFI is based on non-linear excitation of fluctuation/blinking probes using our recently developed fast two-photon three-axis digital scanned light-sheet microscope (2P3A-DSLM), which enables both deep penetration and thin sheet of light. Overall, 2PLS-SOFI demonstrates up to 3-fold spatial resolution enhancement compared with conventional two-photon light-sheet (2PLS) microscopy and about 40-fold temporal resolution enhancement compared with individual molecule localization-selective plane illumination microscopy (IML-SPIM). Therefore, 2PLS-SOFI is promising for 3D long-term, deep-tissue imaging with high spatiotemporal resolution.
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Affiliation(s)
- Xuanze Chen
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, P.R. China.
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27
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Hugelier S, de Rooi JJ, Bernex R, Duwé S, Devos O, Sliwa M, Dedecker P, Eilers PHC, Ruckebusch C. Sparse deconvolution of high-density super-resolution images. Sci Rep 2016; 6:21413. [PMID: 26912448 PMCID: PMC4766479 DOI: 10.1038/srep21413] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 01/22/2016] [Indexed: 11/09/2022] Open
Abstract
In wide-field super-resolution microscopy, investigating the nanoscale structure of cellular processes, and resolving fast dynamics and morphological changes in cells requires algorithms capable of working with a high-density of emissive fluorophores. Current deconvolution algorithms estimate fluorophore density by using representations of the signal that promote sparsity of the super-resolution images via an L1-norm penalty. This penalty imposes a restriction on the sum of absolute values of the estimates of emitter brightness. By implementing an L0-norm penalty--on the number of fluorophores rather than on their overall brightness--we present a penalized regression approach that can work at high-density and allows fast super-resolution imaging. We validated our approach on simulated images with densities up to 15 emitters per μm(-2) and investigated total internal reflection fluorescence (TIRF) data of mitochondria in a HEK293-T cell labeled with DAKAP-Dronpa. We demonstrated super-resolution imaging of the dynamics with a resolution down to 55 nm and a 0.5 s time sampling.
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Affiliation(s)
| | - Johan J. de Rooi
- Erasmus MC, Department of Biostatistics, Rotterdam, the Netherlands
- Swammerdam Institute for Life Sciences (Universiteit van Amsterdam), 1098 XH Amsterdam, The Netherlands
| | - Romain Bernex
- Université de Lille, LASIR CNRS UMR 8516, F-59000 Lille, France
| | - Sam Duwé
- Department of Chemistry, KU Leuven, Belgium
| | - Olivier Devos
- Université de Lille, LASIR CNRS UMR 8516, F-59000 Lille, France
| | - Michel Sliwa
- Université de Lille, LASIR CNRS UMR 8516, F-59000 Lille, France
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28
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Jiang S, Zhang Y, Yang H, Xiao Y, Miao X, Li R, Xu Y, Zhang X. Enhanced SOFI algorithm achieved with modified optical fluctuating signal extraction. OPTICS EXPRESS 2016; 24:3037-45. [PMID: 26906869 DOI: 10.1364/oe.24.003037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In this paper, we present a modified SOFI algorithm with enhanced temporal resolution: the required number of raw images for SOFI is reduced from hundreds to tens. The modification is intended to eliminate the low-frequency fluctuation and readout noise from the raw image stack, and is achieved by separately utilizing two wavelet-based filters in the temporal and spatial domains of the raw image stack. The high-frequency stochastic fluctuating signal could be extracted effectively, and the efficiency of SOFI could be enhanced. The modified SOFI image could be generated with 25 frames of raw images, and the corresponding acquisition time was 1.25 s.
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29
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Vandenberg W, Duwé S, Leutenegger M, Moeyaert B, Krajnik B, Lasser T, Dedecker P. Model-free uncertainty estimation in stochastical optical fluctuation imaging (SOFI) leads to a doubled temporal resolution. BIOMEDICAL OPTICS EXPRESS 2016; 7:467-80. [PMID: 26977356 PMCID: PMC4771465 DOI: 10.1364/boe.7.000467] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 12/22/2015] [Accepted: 12/23/2015] [Indexed: 05/21/2023]
Abstract
Stochastic optical fluctuation imaging (SOFI) is a super-resolution fluorescence imaging technique that makes use of stochastic fluctuations in the emission of the fluorophores. During a SOFI measurement multiple fluorescence images are acquired from the sample, followed by the calculation of the spatiotemporal cumulants of the intensities observed at each position. Compared to other techniques, SOFI works well under conditions of low signal-to-noise, high background, or high emitter densities. However, it can be difficult to unambiguously determine the reliability of images produced by any superresolution imaging technique. In this work we present a strategy that enables the estimation of the variance or uncertainty associated with each pixel in the SOFI image. In addition to estimating the image quality or reliability, we show that this can be used to optimize the signal-to-noise ratio (SNR) of SOFI images by including multiple pixel combinations in the cumulant calculation. We present an algorithm to perform this optimization, which automatically takes all relevant instrumental, sample, and probe parameters into account. Depending on the optical magnification of the system, this strategy can be used to improve the SNR of a SOFI image by 40% to 90%. This gain in information is entirely free, in the sense that it does not require additional efforts or complications. Alternatively our approach can be applied to reduce the number of fluorescence images to meet a particular quality level by about 30% to 50%, strongly improving the temporal resolution of SOFI imaging.
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Affiliation(s)
- Wim Vandenberg
- Department of Chemistry, KULeuven, Celestijnenlaan 200G, 3001 Heverlee,
Belgium
| | - Sam Duwé
- Department of Chemistry, KULeuven, Celestijnenlaan 200G, 3001 Heverlee,
Belgium
| | - Marcel Leutenegger
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen,
Germany
- École Polytechnique Fédérale de Lausanne, Laboratoire d’Optique Biomédicale, 1015 Lausanne,
Switzerland
| | - Benjamien Moeyaert
- Department of Chemistry, KULeuven, Celestijnenlaan 200G, 3001 Heverlee,
Belgium
| | - Bartosz Krajnik
- Department of Chemistry, KULeuven, Celestijnenlaan 200G, 3001 Heverlee,
Belgium
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun,
Poland
| | - Theo Lasser
- École Polytechnique Fédérale de Lausanne, Laboratoire d’Optique Biomédicale, 1015 Lausanne,
Switzerland
| | - Peter Dedecker
- Department of Chemistry, KULeuven, Celestijnenlaan 200G, 3001 Heverlee,
Belgium
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30
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Yang Z, Sharma A, Qi J, Peng X, Lee DY, Hu R, Lin D, Qu J, Kim JS. Super-resolution fluorescent materials: an insight into design and bioimaging applications. Chem Soc Rev 2016; 45:4651-67. [DOI: 10.1039/c5cs00875a] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
With the emerging of super-resolution fluorescent imaging microscopy techniques, biological targets below 200 nm in size are successful to be localized clearly and precisely with unprecedented details. In this tutorial review, the fluorescent materials, including organic fluorophores and nanomaterials, utilized in STED, single molecule localized microscopy (PALM/STORM) and SOFI microscopies, together with their working principles are mainly discussed.
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Affiliation(s)
- Zhigang Yang
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Optoelectronic Engineering
- Shenzhen University
- Shenzhen
- China
| | - Amit Sharma
- Department of Chemistry
- Korea University
- Seoul 136-701
- Korea
| | - Jing Qi
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Optoelectronic Engineering
- Shenzhen University
- Shenzhen
- China
| | - Xiao Peng
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Optoelectronic Engineering
- Shenzhen University
- Shenzhen
- China
| | - Dong Yeop Lee
- Department of Chemistry
- Korea University
- Seoul 136-701
- Korea
| | - Rui Hu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Optoelectronic Engineering
- Shenzhen University
- Shenzhen
- China
| | - Danying Lin
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Optoelectronic Engineering
- Shenzhen University
- Shenzhen
- China
| | - Junle Qu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province
- College of Optoelectronic Engineering
- Shenzhen University
- Shenzhen
- China
| | - Jong Seung Kim
- Department of Chemistry
- Korea University
- Seoul 136-701
- Korea
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31
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Bachmann M, Fiederling F, Bastmeyer M. Practical limitations of superresolution imaging due to conventional sample preparation revealed by a direct comparison of CLSM, SIM and dSTORM. J Microsc 2015; 262:306-15. [PMID: 26694787 DOI: 10.1111/jmi.12365] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 11/06/2015] [Indexed: 12/13/2022]
Abstract
We evaluate the suitability of conventional sample preparation and labelling methods for two superresolution techniques, structured illumination microscopy and direct stochastic optical reconstruction microscopy, by a comparison to established confocal laser scanning microscopy. We show that SIM is compatible with standard fixation procedures and immunofluorescence labelling protocols and improves resolution by a factor of two compared to confocal laser scanning microscopy. With direct stochastic optical reconstruction microscopy, fluorophores can theoretically be localized with much higher precision. However, in practice, with indirect immunofluorescence labelling density can be insufficient due to the bulky probes to reveal biological structures with high resolution. Fine structures like single actin fibres are in fact resolved with direct stochastic optical reconstruction microscopy when using small affinity probes, but require proper adjustment of the fixation protocol. Finally, by a direct comparison of immunofluorescent and genetic labelling with fluorescent proteins, we show that target morphology in direct stochastic optical reconstruction microscopy data sets can differ significantly depending on the labelling method and the molecular environment of the target.
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Affiliation(s)
- Michael Bachmann
- Zoological Institute, Cell- and Neurobiology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Felix Fiederling
- Zoological Institute, Cell- and Neurobiology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Martin Bastmeyer
- Zoological Institute, Cell- and Neurobiology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.,DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
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32
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Stein SC, Huss A, Hähnel D, Gregor I, Enderlein J. Fourier interpolation stochastic optical fluctuation imaging. OPTICS EXPRESS 2015; 23:16154-16163. [PMID: 26193588 DOI: 10.1364/oe.23.016154] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Stochastic Optical Fluctuation Imaging (SOFI) is a super-resolution fluorescence microscopy technique which allows to enhance the spatial resolution of an image by evaluating the temporal fluctuations of blinking fluorescent emitters. SOFI is not based on the identification and localization of single molecules such as in the widely used Photoactivation Localization Microsopy (PALM) or Stochastic Optical Reconstruction Microscopy (STORM), but computes a superresolved image via temporal cumulants from a recorded movie. A technical challenge hereby is that, when directly applying the SOFI algorithm to a movie of raw images, the pixel size of the final SOFI image is the same as that of the original images, which becomes problematic when the final SOFI resolution is much smaller than this value. In the past, sophisticated cross-correlation schemes have been used for tackling this problem. Here, we present an alternative, exact, straightforward, and simple solution using an interpolation scheme based on Fourier transforms. We exemplify the method on simulated and experimental data.
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33
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Zhang X, Chen X, Zeng Z, Zhang M, Sun Y, Xi P, Peng J, Xu P. Development of a reversibly switchable fluorescent protein for super-resolution optical fluctuation imaging (SOFI). ACS NANO 2015; 9:2659-67. [PMID: 25695314 DOI: 10.1021/nn5064387] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Reversibly switchable fluorescent proteins (RSFPs) can be effectively used for super-resolution optical fluctuation imaging (SOFI) based on the switching and fluctuation of single molecules. Several properties of RSFPs strongly influence the quality of SOFI images. These properties include (i) the averaged fluorescence intensity in the fluctuation state, (ii) the on/off contrast ratio, (iii) the photostability, and (iv) the oligomerization tendency. The first three properties determine the fluctuation range of the imaged pixels and the SOFI signal, which are of essential importance to the spatial resolution, and the last may lead to artificial aggregation of target proteins. The RSFPs that are currently used for SOFI are low in averaged fluorescence intensity in the fluctuation state, photostability, and on/off contrast ratio, thereby limiting the range of application of SOFI in biological super-resolution imaging. In this study, we developed a novel monomeric green RSFP termed Skylan-S, which features very high photostability, contrast ratio, and averaged fluorescence intensity in the fluctuation state. Taking advantage of the excellent optical properties of Skylan-S, a 4-fold improvement in the fluctuation range of the imaged pixels and higher SOFI resolution can be obtained compared with Dronpa. Furthermore, super-resolution imaging of the actin or tubulin structures and clathrin-coated pits (CCPs) in living U2OS cells labeled with Skylan-S was demonstrated using the SOFI technique. Overall, Skylan-S developed with outstanding photochemical properties is promising for long-time SOFI imaging with high spatial-temporal resolution.
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Affiliation(s)
- Xi Zhang
- †Institute of Entomology, School of Life Sciences, Central China Normal University, Wuhan 430079, China
- ‡Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Xuanze Chen
- §Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, China
- ∥State Key Laboratory of Biomembrane and Membrane Biotechnology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China
| | - Zhiping Zeng
- §Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Mingshu Zhang
- ‡Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Yujie Sun
- ∥State Key Laboratory of Biomembrane and Membrane Biotechnology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China
| | - Peng Xi
- §Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Jianxin Peng
- †Institute of Entomology, School of Life Sciences, Central China Normal University, Wuhan 430079, China
| | - Pingyong Xu
- ‡Key Laboratory of RNA Biology, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
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