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Bares AJ, Mejooli MA, Pender MA, Leddon SA, Tilley S, Lin K, Dong J, Kim M, Fowell DJ, Nishimura N, Schaffer CB. Hyperspectral multiphoton microscopy for in vivo visualization of multiple, spectrally overlapped fluorescent labels. OPTICA 2020; 7:1587-1601. [PMID: 33928182 PMCID: PMC8081374 DOI: 10.1364/optica.389982] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 09/30/2020] [Indexed: 05/17/2023]
Abstract
The insensitivity of multiphoton microscopy to optical scattering enables high-resolution, high-contrast imaging deep into tissue, including in live animals. Scattering does, however, severely limit the use of spectral dispersion techniques to improve spectral resolution. In practice, this limited spectral resolution together with the need for multiple excitation wavelengths to excite different fluorophores limits multiphoton microscopy to imaging a few, spectrally-distinct fluorescent labels at a time, restricting the complexity of biological processes that can be studied. Here, we demonstrate a hyperspectral multiphoton microscope that utilizes three different wavelength excitation sources together with multiplexed fluorescence emission detection using angle-tuned bandpass filters. This microscope maintains scattering insensitivity, while providing high enough spectral resolution on the emitted fluorescence and capitalizing on the wavelength-dependent nonlinear excitation of fluorescent dyes to enable clean separation of multiple, spectrally overlapping labels, in vivo. We demonstrated the utility of this instrument for spectral separation of closely-overlapped fluorophores in samples containing ten different colors of fluorescent beads, live cells expressing up to seven different fluorescent protein fusion constructs, and in multiple in vivo preparations in mouse cortex and inflamed skin with up to eight different cell types or tissue structures distinguished.
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Affiliation(s)
- Amanda J. Bares
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Menansili A. Mejooli
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Mitchell A. Pender
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Scott A. Leddon
- Center for Vaccine Biology and Immunology, Dept. of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Steven Tilley
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Karen Lin
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Jingyuan Dong
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Minsoo Kim
- Center for Vaccine Biology and Immunology, Dept. of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Deborah J. Fowell
- Center for Vaccine Biology and Immunology, Dept. of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Nozomi Nishimura
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Chris B. Schaffer
- The Nancy E. and Peter C. Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
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Tavares E, Macedo JA, Paulo PM, Tavares C, Lopes C, Melo EP. Live-cell FRET imaging reveals clustering of the prion protein at the cell surface induced by infectious prions. Biochim Biophys Acta Mol Basis Dis 2014; 1842:981-91. [DOI: 10.1016/j.bbadis.2014.02.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 01/14/2014] [Accepted: 02/04/2014] [Indexed: 01/16/2023]
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