1
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Bukhari SSAS, Halder A, Lindinger A. Polarization enhanced two-photon excited fluorescence contrast by shaped laser pulses using a deformable phase plate. APPLIED OPTICS 2023; 62:8242-8247. [PMID: 38037926 DOI: 10.1364/ao.503531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 10/05/2023] [Indexed: 12/02/2023]
Abstract
We utilize spatially and temporally tailored laser pulses for polarization enhanced two-photon excited fluorescence contrasts of dyes. The shaped laser pulses are produced by first passing through a temporal pulse shaper and then through a two-dimensional spatial pulse shaper with deformable phase plates. Different spatial beam profiles are presented that demonstrate the potential of the spatial pulse shaper. Particularly, a polarization enhanced fluorescence contrast between two dyes is reported by utilizing specific phase shaping in perpendicular polarization directions. The tailored laser pulses are further modified by the deformable phase plate, and a polarization increased depth-dependent contrast is achieved. This spatial shaping for all polarization directions demonstrates the advantage of deformable phase plate spatial shapers compared to liquid crystals, where only one polarization direction can spatially be modified. The described polarization contrast method allows for three-dimensional scanning of probes and provides perspectives for biophotonic applications.
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2
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Gottschalk R, Lindinger A. Temporally shaped vortex phase laser pulses for two-photon excited fluorescence. APPLIED OPTICS 2022; 61:10207-10213. [PMID: 36606782 DOI: 10.1364/ao.473744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 11/04/2022] [Indexed: 06/17/2023]
Abstract
We report temporally shaped vortex phase laser pulses for two-photon excited fluorescence of dyes. The particularly tailored pulses are generated by first utilizing a temporal pulse shaper and subsequently a two-dimensional spatial pulse shaper. Various vortex phase shaped structures are demonstrated by combining different two-dimensional phase patterns. Moreover, perpendicular polarization components are used to achieve an enhanced radial two-photon excited fluorescence contrast by applying third order phase functions on the temporal pulse shaper. Particularly, the spatial fluorescence structure is modulated with a combination of Gaussian and vortex phase shaped pulses by modifying only the phase on the temporal modulator. Thereby, interference structures with high spatial resolution arise. The introduced method to generate temporally shaped vortex phase tailored pulses will provide new perspectives for biophotonic applications.
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3
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Notsuka Y, Kurihara M, Hashimoto N, Harada Y, Takahashi E, Yamaoka Y. Improvement of spatial resolution in photoacoustic microscopy using transmissive adaptive optics with a low-frequency ultrasound transducer. OPTICS EXPRESS 2022; 30:2933-2948. [PMID: 35209424 DOI: 10.1364/oe.446309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
Maintaining a high spatial resolution in photoacoustic microscopy (PAM) of deep tissues is difficult due to large aberration in an objective lens with high numerical aperture and photoacoustic wave attenuation. To address the issue, we integrate transmission-type adaptive optics (AO) in high-resolution PAM with a low-frequency ultrasound transducer (UT), which increases the photoacoustic wave detection efficiency. AO improves lateral resolution and depth discrimination in PAM, even for low-frequency ultrasound waves by focusing a beam spot in deep tissues. Using the proposed PAM, we increased the lateral resolution and depth discrimination for blood vessels in mouse ears.
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4
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Yamaguchi K, Otomo K, Kozawa Y, Tsutsumi M, Inose T, Hirai K, Sato S, Nemoto T, Uji-i H. Adaptive Optical Two-Photon Microscopy for Surface-Profiled Living Biological Specimens. ACS OMEGA 2021; 6:438-447. [PMID: 33458495 PMCID: PMC7807736 DOI: 10.1021/acsomega.0c04888] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 11/05/2020] [Indexed: 05/08/2023]
Abstract
We developed adaptive optical (AO) two-photon excitation microscopy by introducing a spatial light modulator (SLM) in a commercially available microscopy system. For correcting optical aberrations caused by refractive index (RI) interfaces at a specimen's surface, spatial phase distributions of the incident excitation laser light were calculated using 3D coordination of the RI interface with a 3D ray-tracing method. Based on the calculation, we applied a 2D phase-shift distribution to a SLM and achieved the proper point spread function. AO two-photon microscopy improved the fluorescence image contrast in optical phantom mimicking biological specimens. Furthermore, it enhanced the fluorescence intensity from tubulin-labeling dyes in living multicellular tumor spheroids and allowed successful visualization of dendritic spines in the cortical layer V of living mouse brains in the secondary motor region with a curved surface. The AO approach is useful for observing dynamic physiological activities in deep regions of various living biological specimens with curved surfaces.
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Affiliation(s)
- Kazushi Yamaguchi
- Graduate
School of Information Science and Technology, Hokkaido University, 060-0814 Sapporo, Hokkaido, Japan
- Research
Institute for Electronic Science, Hokkaido
University, 060-0814 Sapporo, Hokkaido, Japan
- Division
of Biophotonics, National Institute for Physiological Sciences, National Institutes of Natural Sciences, 444-8787 Okazaki, Aichi, Japan
| | - Kohei Otomo
- Graduate
School of Information Science and Technology, Hokkaido University, 060-0814 Sapporo, Hokkaido, Japan
- Research
Institute for Electronic Science, Hokkaido
University, 060-0814 Sapporo, Hokkaido, Japan
- Division
of Biophotonics, National Institute for Physiological Sciences, National Institutes of Natural Sciences, 444-8787 Okazaki, Aichi, Japan
- Exploratory
Research Center on Life and Living Systems, National Institutes of Natural Sciences, 444-8787 Okazaki, Aichi, Japan
- Department
of Physiological Sciences, The Graduate
School for Advanced Study, 240-0193 Hayama, Kanagawa, Japan
| | - Yuichi Kozawa
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 980-8577 Sendai, Miyagi, Japan
| | - Motosuke Tsutsumi
- Research
Institute for Electronic Science, Hokkaido
University, 060-0814 Sapporo, Hokkaido, Japan
- Division
of Biophotonics, National Institute for Physiological Sciences, National Institutes of Natural Sciences, 444-8787 Okazaki, Aichi, Japan
- Exploratory
Research Center on Life and Living Systems, National Institutes of Natural Sciences, 444-8787 Okazaki, Aichi, Japan
| | - Tomoko Inose
- Graduate
School of Information Science and Technology, Hokkaido University, 060-0814 Sapporo, Hokkaido, Japan
- Research
Institute for Electronic Science, Hokkaido
University, 060-0814 Sapporo, Hokkaido, Japan
| | - Kenji Hirai
- Graduate
School of Information Science and Technology, Hokkaido University, 060-0814 Sapporo, Hokkaido, Japan
- Research
Institute for Electronic Science, Hokkaido
University, 001-0020 Sapporo, Hokkaido, Japan
| | - Shunichi Sato
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 980-8577 Sendai, Miyagi, Japan
| | - Tomomi Nemoto
- Graduate
School of Information Science and Technology, Hokkaido University, 060-0814 Sapporo, Hokkaido, Japan
- Research
Institute for Electronic Science, Hokkaido
University, 060-0814 Sapporo, Hokkaido, Japan
- Division
of Biophotonics, National Institute for Physiological Sciences, National Institutes of Natural Sciences, 444-8787 Okazaki, Aichi, Japan
- Exploratory
Research Center on Life and Living Systems, National Institutes of Natural Sciences, 444-8787 Okazaki, Aichi, Japan
- Department
of Physiological Sciences, The Graduate
School for Advanced Study, 240-0193 Hayama, Kanagawa, Japan
| | - Hiroshi Uji-i
- Graduate
School of Information Science and Technology, Hokkaido University, 060-0814 Sapporo, Hokkaido, Japan
- KU
Leuven, Department of Chemistry, Celestijinenlaan 200F, 3001 Heverlee, Leuven, Belgium
- Research
Institute for Electronic Science, Hokkaido
University, 001-0020 Sapporo, Hokkaido, Japan
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5
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In vivo two-photon microscopic observation and ablation in deeper brain regions realized by modifications of excitation beam diameter and immersion liquid. PLoS One 2020; 15:e0237230. [PMID: 32764808 PMCID: PMC7413496 DOI: 10.1371/journal.pone.0237230] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 07/21/2020] [Indexed: 02/06/2023] Open
Abstract
In vivo two-photon microscopy utilizing a nonlinear optical process enables, in living mouse brains, not only the visualization of morphologies and functions of neural networks in deep regions but also their optical manipulation at targeted sites with high spatial precision. Because the two-photon excitation efficiency is proportional to the square of the photon density of the excitation laser light at the focal position, optical aberrations induced by specimens mainly limit the maximum depth of observations or that of manipulations in the microscopy. To increase the two-photon excitation efficiency, we developed a method for evaluating the focal volume in living mouse brains. With this method, we modified the beam diameter of the excitation laser light and the value of the refractive index in the immersion liquid to maximize the excitation photon density at the focal position. These two modifications allowed the successful visualization of the finer structures of hippocampal CA1 neurons, as well as the intracellular calcium dynamics in cortical layer V astrocytes, even with our conventional two-photon microscopy system. Furthermore, it enabled focal laser ablation dissection of both single apical and single basal dendrites of cortical layer V pyramidal neurons. These simple modifications would enable us to investigate the contributions of single cells or single dendrites to the functions of local cortical networks.
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6
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Zhang H, Yarinome K, Kawakami R, Otomo K, Nemoto T, Okamura Y. Nanosheet wrapping-assisted coverslip-free imaging for looking deeper into a tissue at high resolution. PLoS One 2020; 15:e0227650. [PMID: 31923215 PMCID: PMC6953877 DOI: 10.1371/journal.pone.0227650] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Accepted: 12/22/2019] [Indexed: 12/19/2022] Open
Abstract
In order to achieve deep tissue imaging, a number of optical clearing agents have been developed. However, in a conventional microscopy setup, an objective lens can only be moved until it is in contact with a coverslip, which restricts the maximum focusing depth into a cleared tissue specimen. Until now, it is still a fact that the working distance of a high magnification objective lens with a high numerical aperture is always about 100 μm. In this study, a polymer thin film (also called as nanosheet) composed of fluoropolymer with a thickness of 130 nm, less than one-thousandth that of a 170 μm thick coverslip, is employed to replace the coverslip. Owing to its excellent characteristics, such as high optical transparency, mechanical robustness, chemical resistance, and water retention ability, nanosheet is uniquely capable of providing a coverslip-free imaging. By wrapping the tissue specimen with a nanosheet, an extra distance of 170 μm for the movement of objective lens is obtained. Results show an equivalently high resolution imaging can be obtained if a homogenous refractive index between immersion liquid and mounting media is adjusted. This method will facilitate a variety of imaging tasks with off-the-shelf high magnification objectives.
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Affiliation(s)
- Hong Zhang
- Department of Applied Chemistry, School of Engineering, Tokai University, Kanagawa, Japan
- Micro/Nano Technology Center, Tokai University, Kanagawa, Japan
| | - Kenji Yarinome
- Course of Applied Science, Graduate School of Engineering, Tokai University, Kanagawa, Japan
| | - Ryosuke Kawakami
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan
- Department of Molecular Medicine for Pathogenesis, Ehime University Graduate School of Medicine, Ehime, Japan
| | - Kohei Otomo
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan
- Exploratory Research Center on Life and Living Systems, National Institute of Natural Sciences, Aichi, Japan
- National Institute for Physiological Sciences, Aichi, Japan
- The Graduate University for Advanced Studies (SOKENDAI), Aichi, Japan
| | - Tomomi Nemoto
- Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan
- Exploratory Research Center on Life and Living Systems, National Institute of Natural Sciences, Aichi, Japan
- National Institute for Physiological Sciences, Aichi, Japan
- The Graduate University for Advanced Studies (SOKENDAI), Aichi, Japan
| | - Yosuke Okamura
- Department of Applied Chemistry, School of Engineering, Tokai University, Kanagawa, Japan
- Micro/Nano Technology Center, Tokai University, Kanagawa, Japan
- Course of Applied Science, Graduate School of Engineering, Tokai University, Kanagawa, Japan
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7
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Bagramyan A, Galstian T. Dynamic control of polarization mismatch and coma aberrations in rod-GRIN assemblies. OPTICS EXPRESS 2019; 27:14144-14151. [PMID: 31163867 DOI: 10.1364/oe.27.014144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 04/12/2019] [Indexed: 06/09/2023]
Abstract
We describe the use of stacked electrically tunable liquid crystal lenses (TLCLs), along with rod gradient index (GRIN) fixed focus lenses, for endoscopic applications. Architectural and driving conditions are found for the optimization of total aberrations of the assembly. Particular attention is devoted to the coma and polarization aberrations. The coma aberration is reduced by stacking two TLCLs with "opposed" pre-tilt angles (all molecules are in the same plane), and then two such doublets are used with cross oriented molecules (in perpendicular planes) to reduce the polarization dependence. The obtained adaptive rod-GRIN lens enables a focus scan over 80μm (with exceptionally low RMS aberrations ≤0.16μm), making possible the high-quality observation of neurons at various depths.
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8
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ERK Activity Imaging During Migration of Living Cells In Vitro and In Vivo. Int J Mol Sci 2019; 20:ijms20030679. [PMID: 30764494 PMCID: PMC6387119 DOI: 10.3390/ijms20030679] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 01/31/2019] [Accepted: 02/01/2019] [Indexed: 12/12/2022] Open
Abstract
Extracellular signal-regulated kinase (ERK) is a major downstream factor of the EGFR-RAS-RAF signalling pathway, and thus the role of ERK in cell growth has been widely examined. The development of biosensors based on fluorescent proteins has enabled us to measure ERK activities in living cells, both after growth factor stimulation and in its absence. Long-term imaging unexpectedly revealed the oscillative activation of ERK in an epithelial sheet or a cyst in vitro. Studies using transgenic mice expressing the ERK biosensor have revealed inhomogeneous ERK activities among various cell species. In vivo Förster (or fluorescence) resonance energy transfer (FRET) imaging shed light on a novel role of ERK in cell migration. Neutrophils and epithelial cells in various organs such as intestine, skin, lung and bladder showed spatio-temporally different cell dynamics and ERK activities. Experiments using inhibitors confirmed that ERK activities are required for various pathological responses, including epithelial repair after injuries, inflammation, and niche formation of cancer metastasis. In conclusion, biosensors for ERK will be powerful and valuable tools to investigate the roles of ERK in situ.
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9
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Büchau F, Patas A, Yang Y, Lindinger A, Heyne K. A stage-scanning two-photon microscope equipped with a temporal and a spatial pulse shaper: Enhance fluorescence signal by phase shaping. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:123701. [PMID: 30599602 DOI: 10.1063/1.5025792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 11/12/2018] [Indexed: 06/09/2023]
Abstract
Here, we present a stage-scanning two-photon microscope (2PM) equipped with a temporal pulse shaper and a spatial light modulator enabling full control over spectral and spatial phases of the exciting laser pulse. We demonstrate the capability of correcting wavefronts and temporal pulse distortions without cross-dependencies induced by optical elements at the same time enhancing the fluorescence signal. We implemented phase resolved interferometric spectral modulation for temporal pulse shaping and the iterative feedback adaptive compensation technique for spatial pulse modulation as iterative techniques. Sample distortions were simulated by cover glass plates in the optical path and by chirping the exciting laser pulses. Optimization of the spectral and spatial phases results in a signal increase of 30% and nearly complete recovery of the losses. Applying a measured spatial compensation phase within a real leaf sample shows the enhancement in contrast due to wavefront shaping with local fluorescence increase up to 75%. The setup allows full independent control over spatial and spectral phases keeping or improving the spatial resolution of our microscope and provides the optimal tool for sensitive non-linear and coherent control microscopy.
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Affiliation(s)
- Frederik Büchau
- Department of Physics, Free University of Berlin, Arnimallee 14, D-14159 Berlin, Germany
| | - Alexander Patas
- Department of Physics, Free University of Berlin, Arnimallee 14, D-14159 Berlin, Germany
| | - Yang Yang
- Department of Physics, Free University of Berlin, Arnimallee 14, D-14159 Berlin, Germany
| | - Albrecht Lindinger
- Department of Physics, Free University of Berlin, Arnimallee 14, D-14159 Berlin, Germany
| | - Karsten Heyne
- Department of Physics, Free University of Berlin, Arnimallee 14, D-14159 Berlin, Germany
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10
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Otomo K, Hibi T, Fang YC, Hung JH, Tsutsumi M, Kawakami R, Yokoyama H, Nemoto T. Advanced easySTED microscopy based on two-photon excitation by electrical modulations of light pulse wavefronts. BIOMEDICAL OPTICS EXPRESS 2018; 9:2671-2680. [PMID: 30258682 PMCID: PMC6154199 DOI: 10.1364/boe.9.002671] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 03/22/2018] [Accepted: 04/06/2018] [Indexed: 05/28/2023]
Abstract
We developed a compact stimulated emission depletion (STED) two-photon excitation microscopy that utilized electrically controllable components. Transmissive liquid crystal devices inserted directly in front of the objective lens converted the STED light into an optical vortex while leaving the excitation light unaffected. Light pulses of two different colors, 1.06 and 0.64 μm, were generated by laser diode-based light sources, and the delay between the two pulses was flexibly controlled so as to maximize the fluorescence suppression ratio. In our experiments, the spatial resolution of this system was up to three times higher than that obtained without STED light irradiation, and we successfully visualize the fine microtubule network structures in fixed mammalian cells without causing significant photo-damage.
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Affiliation(s)
- Kohei Otomo
- Research Institute for Electronic Science, Hokkaido University, Kita 20 Nishi 10, Kita-ku, Sapporo 001-0020, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Kita 14 Nishi 9, Kita-ku, Sapporo 060-0814, Japan
| | - Terumasa Hibi
- Research Institute for Electronic Science, Hokkaido University, Kita 20 Nishi 10, Kita-ku, Sapporo 001-0020, Japan
| | - Yi-Cheng Fang
- New Industry Creation Hatchery Center (NICHe), Tohoku University, Aramaki-Aoba 6-6-10, Aoba-ku, Sendai 980-8579, Japan
| | - Jui-Hung Hung
- New Industry Creation Hatchery Center (NICHe), Tohoku University, Aramaki-Aoba 6-6-10, Aoba-ku, Sendai 980-8579, Japan
| | - Motosuke Tsutsumi
- Research Institute for Electronic Science, Hokkaido University, Kita 20 Nishi 10, Kita-ku, Sapporo 001-0020, Japan
| | - Ryosuke Kawakami
- Research Institute for Electronic Science, Hokkaido University, Kita 20 Nishi 10, Kita-ku, Sapporo 001-0020, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Kita 14 Nishi 9, Kita-ku, Sapporo 060-0814, Japan
| | - Hiroyuki Yokoyama
- New Industry Creation Hatchery Center (NICHe), Tohoku University, Aramaki-Aoba 6-6-10, Aoba-ku, Sendai 980-8579, Japan
| | - Tomomi Nemoto
- Research Institute for Electronic Science, Hokkaido University, Kita 20 Nishi 10, Kita-ku, Sapporo 001-0020, Japan
- Graduate School of Information Science and Technology, Hokkaido University, Kita 14 Nishi 9, Kita-ku, Sapporo 060-0814, Japan
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11
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Sawada K, Kawakami R, Shigemoto R, Nemoto T. Super-resolution structural analysis of dendritic spines using three-dimensional structured illumination microscopy in cleared mouse brain slices. Eur J Neurosci 2018. [PMID: 29512842 PMCID: PMC5969222 DOI: 10.1111/ejn.13901] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Three‐dimensional (3D) super‐resolution microscopy technique structured illumination microscopy (SIM) imaging of dendritic spines along the dendrite has not been previously performed in fixed tissues, mainly due to deterioration of the stripe pattern of the excitation laser induced by light scattering and optical aberrations. To address this issue and solve these optical problems, we applied a novel clearing reagent, LUCID, to fixed brains. In SIM imaging, the penetration depth and the spatial resolution were improved in LUCID‐treated slices, and 160‐nm spatial resolution was obtained in a large portion of the imaging volume on a single apical dendrite. Furthermore, in a morphological analysis of spine heads of layer V pyramidal neurons (L5PNs) in the medial prefrontal cortex (mPFC) of chronic dexamethasone (Dex)‐treated mice, SIM imaging revealed an altered distribution of spine forms that could not be detected by high‐NA confocal imaging. Thus, super‐resolution SIM imaging represents a promising high‐throughput method for revealing spine morphologies in single dendrites.
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Affiliation(s)
- Kazuaki Sawada
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan.,Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Ryosuke Kawakami
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan.,Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Ryuichi Shigemoto
- Institute of Science and Technology Austria, Klosterneuburg, Austria
| | - Tomomi Nemoto
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan.,Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido, Japan.,Laboratory of Molecular and Cellular Biophysics, Research Institute for Electronic Science, Hokkaido University, Kita 20, Nishi 10, Kita, Sapporo, 001-0020, Hokkaido, Japan
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12
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Reddikumar M, Tanabe A, Hashimoto N, Cense B. Optical coherence tomography with a 2.8-mm beam diameter and sensorless defocus and astigmatism correction. JOURNAL OF BIOMEDICAL OPTICS 2017; 22:26005. [PMID: 28195602 DOI: 10.1117/1.jbo.22.2.026005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 01/23/2017] [Indexed: 05/02/2023]
Abstract
An optical coherence tomography (OCT) system with a 2.8-mm beam diameter is presented. Sensorless defocus correction can be performed with a Badal optometer and astigmatism correction with a liquid crystal device. OCT B-scans were used in an image-based optimization algorithm for aberration correction. Defocus can be corrected from ? 4.3 ?? D to + 4.3 ?? D and vertical and oblique astigmatism from ? 2.5 ?? D to + 2.5 ?? D . A contrast gain of 6.9 times was measured after aberration correction. In comparison with a 1.3-mm beam diameter OCT system, this concept achieved a 3.7-dB gain in dynamic range on a model retina. Both systems were used to image the retina of a human subject. As the correction of the liquid crystal device can take more than 60 s, the subject’s spectacle prescription was adopted instead. This resulted in a 2.5 times smaller speckle size compared with the standard OCT system. The liquid crystal device for astigmatism correction does not need a high-voltage amplifier and can be operated at 5 V. The correction device is small ( 9 ?? mm × 30 ?? mm × 38 ?? mm ) and can easily be implemented in existing designs for OCT.
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Affiliation(s)
- Maddipatla Reddikumar
- Utsunomiya University, Center for Optical Research and Education, Utsunomiya, Tochigi, Japan
| | - Ayano Tanabe
- Citizen Holding, Development Department, Tokorozawa, Saitama, Japan
| | | | - Barry Cense
- Utsunomiya University, Center for Optical Research and Education, Utsunomiya, Tochigi, Japan
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13
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Tanabe A, Hibi T, Ipponjima S, Matsumoto K, Yokoyama M, Kurihara M, Hashimoto N, Nemoto T. Transmissive liquid-crystal device for correcting primary coma aberration and astigmatism in biospecimen in two-photon excitation laser scanning microscopy. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:121503. [PMID: 27624000 DOI: 10.1117/1.jbo.21.12.121503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 08/15/2016] [Indexed: 05/24/2023]
Abstract
All aberrations produced inside a biospecimen can degrade the quality of a three-dimensional image in two-photon excitation laser scanning microscopy. Previously, we developed a transmissive liquid-crystal device to correct spherical aberrations that improved the image quality of a fixed-mouse-brain slice treated with an optical clearing reagent. In this study, we developed a transmissive device that corrects primary coma aberration and astigmatism. The motivation for this study is that asymmetric aberration can be induced by the shape of a biospecimen and/or by a complicated refractive-index distribution in a sample; this can considerably degrade optical performance even near the sample surface. The device’s performance was evaluated by observing fluorescence beads. The device was inserted between the objective lens and microscope revolver and succeeded in improving the spatial resolution and fluorescence signal of a bead image that was originally degraded by asymmetric aberration. Finally, we implemented the device for observing a fixed whole mouse brain with a sloping surface shape and complicated internal refractive-index distribution. The correction with the device improved the spatial resolution and increased the fluorescence signal by ?2.4×. The device can provide a simple approach to acquiring higher-quality images of biospecimens.
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Affiliation(s)
- Ayano Tanabe
- Hokkaido University, Graduate School of Information Science and Technology, N14W9, Kita-Ward, Sapporo, Hokkaido 060-0814, JapanbHokkaido University, Research Institute for Electronic Science, N20W10, Kita-Ward, Sapporo, Hokkaido 001-0020, JapancCitizen Holdings Co., Ltd., 840, Shimotomi, Tokorozawa, Saitama 359-8511, Japan
| | - Terumasa Hibi
- Hokkaido University, Research Institute for Electronic Science, N20W10, Kita-Ward, Sapporo, Hokkaido 001-0020, Japan
| | - Sari Ipponjima
- Hokkaido University, Graduate School of Information Science and Technology, N14W9, Kita-Ward, Sapporo, Hokkaido 060-0814, JapanbHokkaido University, Research Institute for Electronic Science, N20W10, Kita-Ward, Sapporo, Hokkaido 001-0020, Japan
| | - Kenji Matsumoto
- Citizen Holdings Co., Ltd., 840, Shimotomi, Tokorozawa, Saitama 359-8511, Japan
| | - Masafumi Yokoyama
- Citizen Holdings Co., Ltd., 840, Shimotomi, Tokorozawa, Saitama 359-8511, Japan
| | - Makoto Kurihara
- Citizen Holdings Co., Ltd., 840, Shimotomi, Tokorozawa, Saitama 359-8511, Japan
| | - Nobuyuki Hashimoto
- Citizen Holdings Co., Ltd., 840, Shimotomi, Tokorozawa, Saitama 359-8511, Japan
| | - Tomomi Nemoto
- Hokkaido University, Graduate School of Information Science and Technology, N14W9, Kita-Ward, Sapporo, Hokkaido 060-0814, JapanbHokkaido University, Research Institute for Electronic Science, N20W10, Kita-Ward, Sapporo, Hokkaido 001-0020, Japan
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