A peptide-based four-color fluorescent polydopamine nanoprobe for multiplexed sensing and imaging of proteases in living cells

We develop a novel peptide-based four-color fluorescent polydopamine nanoprobe for multiplexed sensing and imaging of tumor-related proteases in living cells. This nanoprobe responds rapidly and selectively, enabling simultaneous and high-contrast imaging of multiple proteases in living cells. Furthermore, it could detect the changes of protease expression in living cells.