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Wu J. Hyperspectral imaging for non-invasive blood oxygen saturation assessment. Photodiagnosis Photodyn Ther 2024; 45:104003. [PMID: 38336148 DOI: 10.1016/j.pdpdt.2024.104003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/27/2024] [Accepted: 02/05/2024] [Indexed: 02/12/2024]
Abstract
Hyperspectral Imaging (HSI) seamlessly integrates imaging and spectroscopy, capturing both spatial and spectral data concurrently. With widespread applications in medical diagnostics, HSI serves as a noninvasive tool for gaining insights into tissue characteristics. The distinctive spectral profiles of biological tissues set HSI apart from traditional microscopy in enabling in vivo tissue analysis. Despite its potential, existing HSI techniques face challenges such as alignment issues, low light throughput, and tissue heating due to intense illumination. This study introduces an innovative HSI system featuring active sequential bandpass illumination seamlessly integrated into conventional optical instruments. The primary focus is on analyzing oxyhemoglobin and deoxyhemoglobin saturation in animal tissue samples using multivariate linear regression. This approach holds promise for enhancing noninvasive medical diagnostics. A key feature of the system, active bandpass illumination, effectively prevents tissue overheating, thereby bolstering its suitability for medical applications.
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Affiliation(s)
- Jiangbo Wu
- School of Information Science and Technology, Fudan University, Shanghai 200433, China.
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Sade O, Boneberg R, Weiss Y, Beldjilali-Labro M, Leichtmann-Bardoogo Y, Talpir I, Gottfried I, Ashery U, Rauti R, Maoz BM. Super-Resolution-Chip: an in-vitro platform that enables super-resolution microscopy of co-cultures and 3D systems. BIOMEDICAL OPTICS EXPRESS 2023; 14:5223-5237. [PMID: 37854575 PMCID: PMC10581794 DOI: 10.1364/boe.498038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/06/2023] [Accepted: 08/12/2023] [Indexed: 10/20/2023]
Abstract
The development of organs-on-a-chip platforms has revolutionized in-vitro cellular culture by allowing cells to be grown in an environment that better mimics human physiology. However, there is still a challenge in integrating those platforms with advanced imaging technology. This is extremely important when we want to study molecular changes and subcellular processes on the level of a single molecule using super-resolution microscopy (SRM), which has a resolution beyond the diffraction limit of light. Currently, existing platforms that include SRM have certain limitations, either as they only support 2D monocultures, without flow or as they demand a lot of production and handling. In this study, we developed a Super-Res-Chip platform, consisting of a 3D-printed chip and a porous membrane, that could be used to co-culture cells in close proximity either in 2D or in 3D while allowing SRM on both sides of the membrane. To demonstrate the functionality of the device, we co-cultured in endothelial and epithelial cells and used direct stochastic optical reconstruction microscopy (dSTORM) to investigate how glioblastoma cells affect the expression of the gap-junction protein Connexin43 in endothelial cells grown in 2D and in 3D. Cluster analysis of Connexin43 distribution revealed no difference in the number of clusters, their size, or radii, but did identify differences in their density. Furthermore, the spatial resolution was high also when the cells were imaged through the membrane (20-30 nm for x-y) and 10-20 nm when imaged directly both for 2D and 3D conditions. Overall, this chip allows to characterize of complex cellular processes on a molecular scale in an easy manner and improved the capacity for imaging in a single molecule resolution complex cellular organization.
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Affiliation(s)
- Ofir Sade
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Ronja Boneberg
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Yifat Weiss
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 69978, Israel
| | | | | | - Itay Talpir
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Irit Gottfried
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Uri Ashery
- School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Rossana Rauti
- Department of Biomolecular Sciences, University of Urbino Carlo Bo, Urbino, 61029, Italy
| | - Ben M Maoz
- Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, 69978, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, 69978, Israel
- The Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv, 69978, Israel
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Birk UJ. Super-Resolution Microscopy of Chromatin. Genes (Basel) 2019; 10:E493. [PMID: 31261775 PMCID: PMC6678334 DOI: 10.3390/genes10070493] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 06/17/2019] [Accepted: 06/26/2019] [Indexed: 01/05/2023] Open
Abstract
Since the advent of super-resolution microscopy, countless approaches and studies have been published contributing significantly to our understanding of cellular processes. With the aid of chromatin-specific fluorescence labeling techniques, we are gaining increasing insight into gene regulation and chromatin organization. Combined with super-resolution imaging and data analysis, these labeling techniques enable direct assessment not only of chromatin interactions but also of the function of specific chromatin conformational states.
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Affiliation(s)
- Udo J Birk
- University of Applied Sciences HTW Chur, Pulvermühlestrasse 57, 7004 Chur, Switzerland.
- Institut für Physik, Universität Mainz, 55122 Mainz, Germany.
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Batth A, Thompson I. Nylon as an in vitro
scaffold for three-dimensional study of neural cells. J Biomed Mater Res A 2018; 106:1575-1584. [DOI: 10.1002/jbm.a.36367] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 01/26/2018] [Accepted: 02/06/2018] [Indexed: 12/19/2022]
Affiliation(s)
- Aran Batth
- Division of Tissue Engineering and Biophotonics; Dental Institute, King's College London, Guy's Hospital; London SE1 9RT United Kingdom
| | - Ian Thompson
- Division of Tissue Engineering and Biophotonics; Dental Institute, King's College London, Guy's Hospital; London SE1 9RT United Kingdom
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