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Multiplexed intracellular detection is desirable in biomedical sciences for its higher efficiency and accuracy compared to the single-analyte detection. However, it is very challenging to construct nanoprobes that possess multiple fluorescent signals to recognize the different intracellular species synchronously. Herein, we proposed a novel dual-excitation/dual-emission upconversion strategy for multiplexed detection through the design of upconversion nanoparticles (UCNP) loaded with two dyes for sensitization and quenching of the upconversion luminescence (UCL), respectively. Based on the two independent energy transfer processes of near-infrared (NIR) dye IR845 to UCNP and UCNP to visible dye PAPS-Zn, ClO- and Zn2+ were simultaneously detected with a limit of detection (LOD) of 41.4 and 10.5 nM, respectively. By utilizing a purpose-built 830/980 nm dual-laser confocal microscope, both intrinsic and exogenous ClO- and Zn2+ in live MCF-7 cells have been accurately quantified. Such dual-excitation/dual-emission ratiometric UCL detection mode enables not only monitoring multiple intracellular analytes but also eliminating the detection deviation caused by inhomogeneous probe distribution in cells. Through modulation of NIR dye and visible dye with other reactive groups, the nanoprobes can be extended to analyze various intracellular species, which provides a promising tool to study the biological activities in live cells and diagnose diseases.


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Multiplexed intracellular detection based on dual-excitation/dual-emission upconversion nanoprobes

Show Author's information Jianxi Ke1,2,3Shan Lu1,3,4( )Zhuo Li1Xiaoying Shang1Xingjun Li1Renfu Li1Datao Tu1,4Zhuo Chen1Xueyuan Chen1,2,3,4( )
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
University of Chinese Academy of Sciences, Beijing 100049, China
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China

Abstract

Multiplexed intracellular detection is desirable in biomedical sciences for its higher efficiency and accuracy compared to the single-analyte detection. However, it is very challenging to construct nanoprobes that possess multiple fluorescent signals to recognize the different intracellular species synchronously. Herein, we proposed a novel dual-excitation/dual-emission upconversion strategy for multiplexed detection through the design of upconversion nanoparticles (UCNP) loaded with two dyes for sensitization and quenching of the upconversion luminescence (UCL), respectively. Based on the two independent energy transfer processes of near-infrared (NIR) dye IR845 to UCNP and UCNP to visible dye PAPS-Zn, ClO- and Zn2+ were simultaneously detected with a limit of detection (LOD) of 41.4 and 10.5 nM, respectively. By utilizing a purpose-built 830/980 nm dual-laser confocal microscope, both intrinsic and exogenous ClO- and Zn2+ in live MCF-7 cells have been accurately quantified. Such dual-excitation/dual-emission ratiometric UCL detection mode enables not only monitoring multiple intracellular analytes but also eliminating the detection deviation caused by inhomogeneous probe distribution in cells. Through modulation of NIR dye and visible dye with other reactive groups, the nanoprobes can be extended to analyze various intracellular species, which provides a promising tool to study the biological activities in live cells and diagnose diseases.

Keywords: energy transfer, upconversion nanoparticles, dual-excitation, dye sensitization, ratiometric probe, multiplexed detection

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Publication history
Copyright
Acknowledgements

Publication history

Received: 15 January 2020
Revised: 24 April 2020
Accepted: 28 April 2020
Published: 22 May 2020
Issue date: July 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

This work was supported by the Science and Technology Cooperation Fund between Chinese and Australian Governments (No. 2017YFE0132300), the Strategic Priority Research Program of the CAS (No. XDB20000000), the National Natural Science Foundation of China (Nos. 51672272, 21771185, 21771178, and 21975257), Youth Innovation Promotion Association of CAS (No. 2017347), and the CAS/SAFEA International Partnership Program for Creative Research Teams.

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