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双通道结构光照明超分辨定量荧光共振能量转移成像系统

罗泽伟 武戈 陈挚 邓驰楠 万蓉 杨涛 庄正飞 陈同生

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双通道结构光照明超分辨定量荧光共振能量转移成像系统

罗泽伟, 武戈, 陈挚, 邓驰楠, 万蓉, 杨涛, 庄正飞, 陈同生

Dual-channel structured illumination super-resolution quantitative fluorescence resonance energy transfer imaging

Luo Ze-Wei, Wu Ge, Chen Zhi, Deng Chi-Nan, Wan Rong, Yang Tao, Zhuang Zheng-Fei, Chen Tong-Sheng
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  • 基于结构光照明 (structured illumination, SI) 的超分辨荧光共振能量转移(super resolution fluorescence resonance energy transfer, SR-FRET) 成像技术(SISR-FRET) 可以通过解析活细胞内亚衍射区域的FRET信号来研究细胞器精细结构上的分子结构与功能. SISR-FRET成像中激发发射通道切换导致成像速度较慢, 限制了SISR-FRET在快速成像中的应用. 针对此问题, 本文提出一种双通道结构光照明超分辨定量FRET成像系统和方法, 通过在成像光路中加入FRET双通道成像和配准模块, 实现了SISR-FRET激发发射通道的空分切换以及通道复用. 结合通道亚像素配准校正的图像重建算法, 双通道SISR-FRET可以在保持定量超分辨FRET分析的同时提升了3.5倍时间分辨率. 利用搭建的多色SIM系统进行了活细胞表达靶向线粒体外膜FRET标准质粒的超分辨成像实验, 验证了双通道SISR-FRET的时空分辨率增强和FRET定量分析的保真度.
    The Structured illumination (SI)-based super resolution fluorescence resonance energy transfer (SR-FRET) imaging technique, known as SISR-FRET, enables the investigation of molecular structures and functions in cellular organelles by resolving sub-diffraction FRET signals within living cells. The FRET microscopy offers unique advantages for quantitatively detecting dynamic interactions and spatial distribution of biomolecules within living cells. The spatial resolution of conventional FRET microscopy is limited by the diffraction limit, and it can only capture the average behavior of these events within the resolution limits of conventional fluorescence microscopy. The SISR-FRET performs sequential linear reconstruction of the three-channel SIM images followed by FRET quantitative analysis by using a common localization mask-based filtering approach. This two-step process ensures the fidelity of the reconstructed SR-FRET signals while effectively removing false-positive FRET signals caused by SIM artifacts. However, the slow imaging speed resulting from the switching of excitation-emission channels in SISR-FRET imaging limits its application in fast imaging scenarios. To address this issue, this study proposes a dual-channel structured illumination super-resolution quantitative FRET imaging system and method. By incorporating an FRET dual-channel imaging and registration module into the imaging pathway, the spatial switching and channel multiplexing of the SISR-FRET excitation-emission channels are achieved. Combining the image reconstruction algorithm with channel sub-pixel registration correction, the dual-channel SISR-FRET technique enhances the temporal resolution by 3.5 times while preserving the quantitative super-resolution FRET analysis. Experimental results are obtained by using a multi-color SIM system to perform super-resolution imaging of living cells expressing mitochondria outer membrane FRET standard plasmids. These experiments validate the improved spatial and temporal resolution of dual-channel SISR-FRET and the fidelity of FRET quantification analysis. In summary, this research presents a novel dual-channel structured illumination super-resolution FRET imaging system and method. It overcomes the limitations of slow imaging speed in SISR-FRET by realizing the spatial switching and channel multiplexing of excitation-emission channels. The proposed technique enhances the temporal resolution while maintaining quantitative analysis of super-resolution FRET. Experimental validation demonstrates the increased spatial and temporal resolution of dual-channel SISR-FRET and the accuracy of FRET quantification analysis. This advancement contributes to the study of molecular structures and functions in cellular organelles, providing valuable insights into the intricate mechanisms of living cells.
      通信作者: 陈同生, chentsh@scnu.edu.cn
    • 基金项目: 国家自然科学基金(批准号: 62135003) 和广东省重点领域研发计划(批准号: 2022B0303040003) 资助的课题.
      Corresponding author: Chen Tong-Sheng, chentsh@scnu.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 62135003) and the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2022B0303040003).
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    Szalai A M, Zaza C, Stefani F D 2021 Nanoscale 13 18421Google Scholar

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    Deußner-Helfmann N S, Auer A, Strauss M T, Malkusch S, Dietz M S, Barth H D, Jungmann R, Heilemann M 2018 Nano Lett. 18 4626Google Scholar

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    Tardif C, Nadeau G, Labrecque S, Côté D, Lavoie-Cardinal F 2019 Neurophotonics 6 1

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    Kner P, Chhun B B, Griffis E R, Winoto L, Gustafsson M G L 2009 Nat. Methods 6 339Google Scholar

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    Wen G, Li S M, Wang L B, et al. 2021 Light Sci. Appl. 10 70Google Scholar

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    Luo Z W, Wu G, Kong M, Chen Z, Zhuang Z F, Fan J C, Chen T S 2023 Photonics Res. 11 887Google Scholar

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    Fan J C, Huang X S, Li L, Tan S, Chen L 2019 Biophys. Rep. 5 80Google Scholar

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    Sun H, Zhang C, Ma Y, Du M, Chen T S 2019 Biomed. Signal Process. Control 53 101585Google Scholar

  • 图 1  双通道SISR-FRET系统光路示意图

    Fig. 1.  Schematic diagram of dual-channel SISR-FRET system.

    图 2  双通道SISR-FRET的算法流程图

    Fig. 2.  Flow chart of dual-channel SISR-FRET algorithm.

    图 3  双通道SISR-FRET与单通道SISR-FRET时序图对比 (a)单通道SISR-FRET在一个FRET采集周期的时序图; (b)双通道SISR-FRET相同周期的时序图

    Fig. 3.  Comparison of timing sequence of dual-channel SISR-FRET and single-channel SISR-FRET: (a) Timing sequence of single-channel SISR-FRET in one FRET acquisition cycle; (b) timing sequence of dual-channel SISR-FRET in the same cycle.

    图 4  双通道SISR-FRET通道对准效果 (a) DD通道和AA通道成像结果的伪彩图, 绿色为DD通道, 红色为AA通道;(b)未经过算法对准的DD通道和AA通道成像结果叠加图; (c)经过仿射变换矩阵对准的DD通道和AA通道成像结果叠加图. 比例尺: 2 μm

    Fig. 4.  Dual-channel SISR-FRET alignment results: (a) Pseudo-color image of DD channel and AA channel imaging results, green is DD channel, red is AA channel; (b) overlay of the imaging results of DD channel and AA channel without algorithm alignment; (c) overlay of DD channel and AA channel imaging results after affine transformation matrix alignment. Scale bar: 2 μm.

    图 5  双通道SISR-FRET成像系统对ActA-G17 M样本成像结果 (a)—(c) DD, DA, AA通道宽场成像结果; (d)—(f) DD, DA, AA通道超分辨成像结果. 比例尺: 2 μm

    Fig. 5.  Imaging results of the dual-channel SISR-FRET imaging system for the ActA-G17M sample: (a)–(c) Wide-field imaging results in the DD, DA, and AA channels; (d)–(f) super-resolution imaging results in the DD, DA, and AA channels. Scale bar: 2 μm.

    图 6  双通道SISR-FRET成像定量FRET分析结果对比 (a)宽场FRET和超分辨FRET效率ED的伪彩图; (b)图(a)中结果的统计直方图; (c)宽场FRET和超分辨FRET受供体浓度比 RC的伪彩图; (d) 图(c)中结果的统计直方图. 比例尺: 2 μm

    Fig. 6.  Comparison of quantitative FRET analysis results from dual-channel SISR-FRET imaging: (a) Pseudo-color map of ED for wide-field FRET and super-resolution FRET; (b) corresponding statistical histograms; (c) pseudo-color plot of RC for wide-field FRET and super-resolution FRET; (d) corresponding statistical histograms. Scale bars: 2 μm.

    图 7  双通道SISR-FRET分辨率提升的定量分析 (a) 宽场FRET效率ED的伪彩图和DD通道灰度图像的重叠结果; (b) SISR-FRET效率ED的伪彩图和DD通道灰度图像的重叠结果; (c) 宽场FRET与SISR-FRET中DD通道灰度图像的局部细节对比; (d) 宽场FRET与SISR-FRET中效率ED的伪彩图的局部细节对比; (e), (f) 图 (c)和图 (d)中划线位置的横切面强度图. 比例尺: 2 μm

    Fig. 7.  Quantitative analysis of dual-channel SISR-FRET resolution enhancement: (a) The merge of intensity and ED map images of wide-field FRET; (b) the merge of intensity and ED map images of SISR-FRET; (c) partly enlarged view of intensity images of wide-field FRET and SISR-FRET in the DD channel; (d) partly enlarged view of ED map images of wide-field FRET and SISR-FRET; (e), (f) normalized intensity and FRET profiles along the marked lines in (c) and (d). Scale bars: 2 μm.

  • [1]

    Rao V S, Srinivas K, Sujini G N, Kumar G N S 2014 Int. J. Proteomics 2014 1

    [2]

    Acuner Ozbabacan S E, Engin H B, Gursoy A, Keskin O 2011 Protein Eng. Des. Sel. 24 635Google Scholar

    [3]

    Xing S, Wallmeroth N, Berendzen K W, Grefen C 2016 Plant Physiol. 171 727

    [4]

    Algar W R, Hildebrandt N, Vogel S S, Medintz I L 2019 Nat. Methods 16 815Google Scholar

    [5]

    Jares-Erijman E A, Jovin T M 2003 Nat. Biotechnol. 21 1387Google Scholar

    [6]

    Ben-Johny M, Yue D N, Yue D T 2016 Nat. Commun. 7 13709Google Scholar

    [7]

    Chen H C, Sun B N, Sun H, Xu L J, Wu G H, Tu Z, Cheng X C, Fan X H, Mai Z H, Tang Q L, Wang X P, Chen T S 2021 Cell Death Discov. 7 363Google Scholar

    [8]

    Sun B N, Chen H C, Wang X P, Chen T S 2023 Cell Death Discov. 9 37

    [9]

    Yang F F, Qu W F, Du M Y, Mai Z Y, Wang B, Ma Y Y, Wang X P, Chen T S 2020 Cell. Mol. Life Sci. 77 2387Google Scholar

    [10]

    Szalai A M, Zaza C, Stefani F D 2021 Nanoscale 13 18421Google Scholar

    [11]

    Szabó Á, Szendi-Szatmári T, Szöllősi J, Nagy P 2020 Methods Appl. Fluoresc. 8 032003Google Scholar

    [12]

    Grecco H E, Verveer P J 2011 ChemPhysChem 12 484Google Scholar

    [13]

    Deußner-Helfmann N S, Auer A, Strauss M T, Malkusch S, Dietz M S, Barth H D, Jungmann R, Heilemann M 2018 Nano Lett. 18 4626Google Scholar

    [14]

    Tardif C, Nadeau G, Labrecque S, Côté D, Lavoie-Cardinal F 2019 Neurophotonics 6 1

    [15]

    Szalai A M, Siarry B, Lukin J, Giusti S, Unsain N, Cáceres A, Steiner F, Tinnefeld P, Refojo D, Jovin T M, Stefani F D 2021 Nano Lett. 21 2296Google Scholar

    [16]

    Liu Z, Luo Z W, Chen H C, Yin A, Sun H, Zhuang Z F, Chen T S 2022 Cytom. Part A 101 264Google Scholar

    [17]

    Zhao T Y, Wang Z J, Cai Y N, Liang Y S, Wang SW, Zhang J X, Chen T S, Lei M 2023 Opt. Lasers Eng. 167 107606Google Scholar

    [18]

    Zhao W S, Zhao S Q, Li L J, et al. 2022 Nat. Biotechnol. 40 606Google Scholar

    [19]

    Huang X S, Fan J C, Li L J, Liu H S, Wu R L, Wu Y, Wei L S, Mao H, Lal A, Xi P, Tang L Q, Zhang Y F, Liu Y M, Tan S, Chen L Y 2018 Nat. Biotechnol. 36 451Google Scholar

    [20]

    Li D, Shao L, Chen B C, Zhang X, Zhang M, Moses B, Milkie D E, Beach J R, Hammer J A, Pasham M, Kirchhausen T, Baird M A, Davidson M W, Xu P, Betzig E 2015 Science 349 aab3500Google Scholar

    [21]

    Kner P, Chhun B B, Griffis E R, Winoto L, Gustafsson M G L 2009 Nat. Methods 6 339Google Scholar

    [22]

    Wen G, Li S M, Wang L B, et al. 2021 Light Sci. Appl. 10 70Google Scholar

    [23]

    Luo Z W, Wu G, Kong M, Chen Z, Zhuang Z F, Fan J C, Chen T S 2023 Photonics Res. 11 887Google Scholar

    [24]

    Fan J C, Huang X S, Li L, Tan S, Chen L 2019 Biophys. Rep. 5 80Google Scholar

    [25]

    Sun H, Zhang C, Ma Y, Du M, Chen T S 2019 Biomed. Signal Process. Control 53 101585Google Scholar

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出版历程
  • 收稿日期:  2023-05-25
  • 修回日期:  2023-06-28
  • 上网日期:  2023-07-07
  • 刊出日期:  2023-10-20

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