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He G, Liu M, Wang F, Sun S, Cao Y, Sun Y, Ma S, Wang Y. Non-invasive assessment of hair regeneration in androgenetic alopecia mice in vivo using two-photon and second harmonic generation imaging. BIOMEDICAL OPTICS EXPRESS 2023; 14:5870-5885. [PMID: 38021124 PMCID: PMC10659803 DOI: 10.1364/boe.503312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 09/15/2023] [Accepted: 09/20/2023] [Indexed: 12/01/2023]
Abstract
The identification of crucial targets for hair regrowth in androgenetic alopecia (AGA) involves determining important characteristics and different stages during the process of hair follicle regeneration. Traditional methods for assessing key features and different stages of hair follicle primarily involve taking skin tissue samples and determining them through various staining or other methods. However, non-invasive assessment methods have been long sought. Therefore, in this study, endogenous fluorescence signals from skin keratin and second harmonic signals from skin collagen fibers were utilized as probes, two-photon excited fluorescence (TPEF) and second harmonic generation (SHG) imaging techniques were employed to non-invasively assess hair shafts and collagen fibers in AGA mice in vivo. The TPEF imaging technique revealed that the alternation of new and old hair shafts and the different stages of the growth period in AGA mice were delayed. In addition, SHG imaging found testosterone reduced hair follicle area and miniaturized hair follicles. The non-invasive TPEF and SHG imaging techniques provided important methodologies for determining significant characteristics and different stages of the growth cycle in AGA mice, which will facilitate future non-invasive assessments on human scalps in vivo and reduce the use of animal testing.
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Affiliation(s)
- Gaiying He
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Menghua Liu
- School of Life Science, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Fenglong Wang
- School of Life Science, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Shuqing Sun
- Institute of Biopharmaceutical and Healthcare Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Yu Cao
- Institute of Geriatrics, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing 100091, China
| | - Yanan Sun
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Shuhua Ma
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing 100700, China
| | - Yi Wang
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing 100700, China
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AbouHassan I, Kasabov NK, Jagtap V, Kulkarni P. Spiking neural networks for predictive and explainable modelling of multimodal streaming data with a case study on financial time series and online news. Sci Rep 2023; 13:18367. [PMID: 37884551 PMCID: PMC10603166 DOI: 10.1038/s41598-023-42605-0] [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: 11/11/2022] [Accepted: 09/12/2023] [Indexed: 10/28/2023] Open
Abstract
In a first study, this paper argues and demonstrates that spiking neural networks (SNN) can be successfully used for predictive and explainable modelling of multimodal streaming data. The paper proposes a new method, where both time series and on-line news are integrated as numerical streaming data in the same time domain and then used to train incrementally a SNN model. The connectivity and the spiking activity of the SNN are then analyzed through clustering and dynamic graph extraction to reveal on-line interaction between all input variables in regard to the predicted one. The paper answers the main research question of how to understand the dynamic interaction of time series and on-line news through their integrative modelling. It offers a new method to evaluate the efficiency of using on-line news on the predictive modelling of time series. Results on financial stock time series and online news are presented. In contrast to traditional machine learning techniques, the method reveals the dynamic interaction between stock variables and news and their dynamic impact on model accuracy when compared to models that do not use news information. Along with the used financial data, the method is applicable to a wide range of other multimodal time series and news data, such as economic, medical, environmental and social. The proposed method, being based on SNN, promotes the use of massively parallel and low energy neuromorphic hardware for multivariate on-line data modelling.
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Affiliation(s)
- Iman AbouHassan
- Technical University of Sofia, Sofia, Bulgaria.
- Central Bank of Lebanon, Beirut, Lebanon.
| | - Nikola K Kasabov
- KEDRI, SECMS, Auckland University of Technology, Auckland, New Zealand.
- Ulster University, Belfast, UK.
- IICT, Bulgarian Academy of Sciences, Sofia, Bulgaria.
| | | | - Parag Kulkarni
- College of Engineering, Pune, India
- Tokyo International University, Tokyo, Japan
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Shintate R, Ishii T, Ahn J, Kim JY, Kim C, Saijo Y. High-speed optical resolution photoacoustic microscopy with MEMS scanner using a novel and simple distortion correction method. Sci Rep 2022; 12:9221. [PMID: 35654947 PMCID: PMC9163157 DOI: 10.1038/s41598-022-12865-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 05/03/2022] [Indexed: 11/09/2022] Open
Abstract
Optical resolution photoacoustic microscopy (OR-PAM) is a remarkable biomedical imaging technique that can selectively visualize microtissues with optical-dependent high resolution. However, traditional OR-PAM using mechanical stages provides slow imaging speed, making it difficult to biologically interpret in vivo tissue. In this study, we developed a high-speed OR-PAM using a recently commercialized MEMS mirror. This system (MEMS-OR-PAM) consists of a 1-axis MEMS mirror and a mechanical stage. Furthermore, this study proposes a novel calibration method that quickly removes the spatial distortion caused by fast MEMS scanning. The proposed calibration method can easily correct distortions caused by both the scan geometry of the MEMS mirror and its nonlinear motion by running an image sequence only once using a ruler target. The combination of MEMS-OR-PAM and distortion correction method was verified using three experiments: (1) leaf skeleton phantom imaging to test the distortion correction efficacy; (2) spatial resolution and depth of field (DOF) measurement for system performance; (3) in-vivo finger capillary imaging to verify their biomedical use. The results showed that the combination could achieve a high-speed (32 s in 2 × 4 mm) and high lateral resolution (~ 6 µm) imaging capability and precisely visualize the circulating structure of the finger capillaries.
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Affiliation(s)
- Ryo Shintate
- Graduate School of Biomedical Engineering, Tohoku University, Sendai, 980-8579, Japan.
| | - Takuro Ishii
- Graduate School of Biomedical Engineering, Tohoku University, Sendai, 980-8579, Japan.,Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, 930-8555, Japan
| | - Joongho Ahn
- Department of Convergence IT Engineering, Electrical Engineering, and Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Jin Young Kim
- Department of Convergence IT Engineering, Electrical Engineering, and Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Chulhong Kim
- Department of Convergence IT Engineering, Electrical Engineering, and Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Yoshifumi Saijo
- Graduate School of Biomedical Engineering, Tohoku University, Sendai, 980-8579, Japan
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Ivanov IE, Yeh LH, Perez-Bermejo JA, Byrum JR, Kim JYS, Leonetti MD, Mehta SB. Correlative imaging of the spatio-angular dynamics of biological systems with multimodal instant polarization microscope. BIOMEDICAL OPTICS EXPRESS 2022; 13:3102-3119. [PMID: 35774313 PMCID: PMC9203109 DOI: 10.1364/boe.455770] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/22/2022] [Accepted: 03/22/2022] [Indexed: 05/29/2023]
Abstract
The spatial and angular organization of biological macromolecules is a key determinant, as well as informative readout, of their function. Correlative imaging of the dynamic spatio-angular architecture of cells and organelles is valuable, but remains challenging with current methods. Correlative imaging of spatio-angular dynamics requires fast polarization-, depth-, and wavelength-diverse measurement of intrinsic optical properties and fluorescent labels. We report a multimodal instant polarization microscope (miPolScope) that combines a broadband polarization-resolved detector, automation, and reconstruction algorithms to enable label-free imaging of phase, retardance, and orientation, multiplexed with fluorescence imaging of concentration, anisotropy, and orientation of molecules at diffraction-limited resolution and high speed. miPolScope enabled multimodal imaging of myofibril architecture and contractile activity of beating cardiomyocytes, cell and organelle architecture of live HEK293T and U2OS cells, and density and anisotropy of white and grey matter of mouse brain tissue across the visible spectrum. We anticipate these developments in joint quantitative imaging of density and anisotropy to enable new studies in tissue pathology, mechanobiology, and imaging-based screens.
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Affiliation(s)
- Ivan E. Ivanov
- Chan Zuckerberg Biohub, 499 Illinois St, San Francisco, CA 94158, USA
| | - Li-Hao Yeh
- Chan Zuckerberg Biohub, 499 Illinois St, San Francisco, CA 94158, USA
| | | | - Janie R. Byrum
- Chan Zuckerberg Biohub, 499 Illinois St, San Francisco, CA 94158, USA
| | - James Y. S. Kim
- Chan Zuckerberg Biohub, 499 Illinois St, San Francisco, CA 94158, USA
| | | | - Shalin B. Mehta
- Chan Zuckerberg Biohub, 499 Illinois St, San Francisco, CA 94158, USA
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Lee H, Seeger MR, Lippok N, Nadkarni SK, van Soest G, Bouma BE. Nanosecond SRS fiber amplifier for label-free near-infrared photoacoustic microscopy of lipids. PHOTOACOUSTICS 2022; 25:100331. [PMID: 35096525 PMCID: PMC8783138 DOI: 10.1016/j.pacs.2022.100331] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 01/05/2022] [Accepted: 01/14/2022] [Indexed: 05/18/2023]
Abstract
Near-infrared photoacoustics receives increasing interest as an intravital modality to sense key biomolecules. One of the most central types of biomolecules of interest are lipids as they constitute essential bio-hallmarks of cardiovascular and metabolic diseases and their in-vivo detection holds insightful information about disease progression and treatment monitoring. However, the full potential of near-infrared photoacoustic for high-resolution and high-sensitivity biomedical studies of lipids has so far not been exploited due a lack of appropriate excitation sources delivering short-pulses at high-repetition-rate, high-pulse-energy, and wavelength around 1200 nm. Here, we demonstrate a custom-built SRS fiber amplifier that provides optical excitations at 1192.8 nm, repetition rates of 200 kHz, pulse durations below 2 ns, and pulse energies beyond 5 μJ. We capitalize on the performance of our excitation source and show near-infrared photoacoustics resolving intrinsic lipid contrast in biomedically relevant specimens ranging from single cells to lipid-rich tissue with subcellular resolution.
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Affiliation(s)
- Hwidon Lee
- Harvard Medical School, Boston, Massachusetts, MA 02115, USA
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, 40 Blossom Street, Boston, MA 02114, USA
| | - Markus R. Seeger
- Harvard Medical School, Boston, Massachusetts, MA 02115, USA
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, 40 Blossom Street, Boston, MA 02114, USA
| | - Norman Lippok
- Harvard Medical School, Boston, Massachusetts, MA 02115, USA
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, 40 Blossom Street, Boston, MA 02114, USA
| | - Seemantini K. Nadkarni
- Harvard Medical School, Boston, Massachusetts, MA 02115, USA
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, 40 Blossom Street, Boston, MA 02114, USA
| | - Gijs van Soest
- Department of Biomedical Engineering, Erasmus Medical Center, PO Box 2040, 3000 Rotterdam, CA The Netherlands
| | - Brett E. Bouma
- Harvard Medical School, Boston, Massachusetts, MA 02115, USA
- Wellman Center for Photomedicine, Harvard Medical School and Massachusetts General Hospital, 40 Blossom Street, Boston, MA 02114, USA
- Department of Biomedical Engineering, Erasmus Medical Center, PO Box 2040, 3000 Rotterdam, CA The Netherlands
- Institute for Medical Engineering and Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Corresponding author at: Harvard Medical School, Boston, Massachusetts, MA 02115, USA.
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