Different cell-penetrating peptides (CPPs) for delivery of green fluorescent protein (GFP) into mammalian cells

We use green fluorescent protein (GFP) as a model cargo to compare the delivery capability of five CPP sequences (Penetratin, R8, TAT, Transportan, Xentry) and their derivatives (cyclic R8, cyclic TAT, TAT-HA) in four cell lines (HeLa, HEK, 10T1/2, HepG2). 

For confocal microscopy experiments, HeLa cells were incubated with 10 µM of the designated eGFP-CPP fusion proteins at 37 °C for 1 h before imaging. Nucleus were stained with Hoechst which shows blue fluorescence. Biological duplicates of confocal microscopy results (*.lif) are available here. 

For flow cytometry experiments, cells were treated with 10 µM of eGFP-CPP fusion proteins at 37 °C for 1 h before analysis. Biological triplicates of flow cytometry results (*.fcs) are available here.