Issue 11, 2020

A lysosome-targeted near-infrared fluorescent probe for imaging endogenous cysteine (Cys) in living cells

Abstract

Cysteine (Cys) is one of the most important essential biothiols in lysosomes. Highly selective probes for specific detection and imaging of lysosomal Cys over other biological thiols are rare. Herein, we developed a lysosome-targeted near-infrared fluorescent probe SHCy-C based on a novel NIR-emitting thioxanthene–indolium dye. Due to the turn-on fluorescence response elicited by the intramolecular charge transfer (ICT) processes before and after the reaction with Cys, probe SHCy-C exhibits high selectivity and sensitivity (16 nM) for the detection of Cys. More importantly, probe SHCy-C is found to precisely target lysosomes and achieves the “turn-on” detection and imaging of endogenous Cys in lysosomes.

Graphical abstract: A lysosome-targeted near-infrared fluorescent probe for imaging endogenous cysteine (Cys) in living cells

Supplementary files

Article information

Article type
Paper
Submitted
19 Huk 2019
Accepted
03 Yan 2020
First published
04 Yan 2020

J. Mater. Chem. B, 2020,8, 2269-2274

A lysosome-targeted near-infrared fluorescent probe for imaging endogenous cysteine (Cys) in living cells

S. Cai, C. Liu, X. Jiao, L. Zhao and X. Zeng, J. Mater. Chem. B, 2020, 8, 2269 DOI: 10.1039/C9TB02609F

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