Simple and efficient delivery of cell-impermeable organic fluorescent probes into live cells for live-cell superresolution imaging

摘要

Numerous commercial organic fluorophores with excellent optical properties are precluded from live-cell superresolution imaging due to poor cell permeability.Here,we develop a simple but effective strategy that renders cells permeable to cell-impermeable,organic fluorescent probes by using a novel peptide vehicle,PV-1.By simple coincubation with PV-1,22 different cell-impermeable,organic fluorescent probes were efficiently delivered into live cells and specifically labeled a variety of organelles.Moreover,PV-1 can simultaneously transfer up to three different probes into live cells.By using PV-1 and these cell-impermeable fluorescent probes,we obtained multicolor,long-term,live-cell superresolution images of various organelles,which allowed us to study the dynamic interactions between them.PV-1,together with these organic fluorescent probes,will greatly broaden the applications of superresolution imaging technology in diverse live-cell studies and opens up a new avenue in the design and application of peptide vehicles.