Abstract
Formaldehyde (FA), as a reactive signaling molecule, plays an important role in living systems through a diverse array of cellular pathways. However, no systematic investigation for detection and imaging of FA by rendering cells transiently permeable has been reported yet. Specifically, we developed a new cell-permeable fluorescence probe functionality that was enhanced cellular entry efficiency and well retained intracellularly after activation for visualizing endogenous FA changes. Moreover, a smart “multi-lock system -key-and-lock” strategy，which have provoked a starting point for the use of probe and related biochemical tools to monitor FA in lysosomes. The versatile “latent” fluorophore that can undergo a subsequent self-immolative spacer for interrogating the roles and functions of FA in living systems as well as related biomedical applications.
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