Pochechuev MS, Lanin AA, Kelmanson IV, Chebotarev AS, Fetisova ES, Bilan DS, Shevchenko EK, Ivanov AA, Fedotov AB, Belousov VV, Zheltikov AM. Multimodal nonlinear-optical imaging of nucleoli.
OPTICS LETTERS 2021;
46:3608-3611. [PMID:
34329236 DOI:
10.1364/ol.416300]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 02/12/2021] [Indexed: 06/13/2023]
Abstract
Multimodal nonlinear microscopy combining third-harmonic generation (THG) with two- and three-photon-excited fluorescence (2PEF and 3PEF) is shown to provide a powerful resource for high-fidelity imaging of nucleoli and nucleolar proteins. We demonstrate that, with a suitably tailored genetically encoded fluorescent stain, the 2PEF/3PEF readout from specific nucleolar proteins can be reliably detected against the extranucleolar 2PEF/3PEF signal, enabling high-contrast imaging of the key nucleolar ribosome biogenesis components, such as fibrillarin. THG is shown to provide a versatile readout for unstained nucleolus imaging in a vast class of biological systems as different as neurons in brain slices and cultured HeLa cells.
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