Dynamically Monitoring Cell Viability in a Dual‐Color Mode: Construction of an Aggregation/Monomer‐Based Probe Capable of Reversible Mitochondria‐Nucleus Migration

Abstract Mitochondria and nucleus play crucial roles during cell apoptosis process. In this work, a unique fluorescent probe capable of reversible migration between mitochondria and nucleus, as well as detection of cell viability in a dual‐color mode is presented. The dual‐color probe targets mitochondria in healthy cells, to form aggregates with deep‐red emission. It migrates into nucleus and binds to DNA to form monomers with green fluorescence during apoptosis. Interestingly, the migration is reversible dependent on cell viability, which enables the dynamic visualization of apoptosis process. With the probe, mitochondria and nucleus can be visualized in dual colors during apoptosis, and the cell viability could be monitored by the emission color and localization of the probe.